CN101274302A - Stepped-flotation separation method for iron ore containing carbonas - Google Patents
Stepped-flotation separation method for iron ore containing carbonas Download PDFInfo
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Abstract
The invention discloses a flotation and separation method of carbonate-bearing iron ore which has fractional steps and is characterized in that the carbonate-bearing iron ore is milled by a ball milling method and pre-separated by adopting low-intensity magnetic separation and high-intensity magnetic separation, and iron ore concentrate that is obtained from the mixed magnetic separation is separated by the flotation technique with fractional steps, which comprises the following steps: in the first step, siderite concentrate is selected under neutral condition by adopting the direct flotation technique; in the second step, the hematite concentrate is selected under strong basicity condition by adopting the reverse flotation technique. The flotation and separation method of the carbonate-bearing iron ore of the invention has smooth process running, the siderite selection in the first step improves flotation environment, and the hematite selection in the second step can finally obtain the hematite concentrate with the iron grade of over 66 percent and the recovery rate of over 62 percent. The flotation and separation method of the carbonate-bearing iron ore of the invention provides an exploiting method of the domestic potential iron ore resources with low iron grade and has important significance to the economical and reasonable exploiting of the carbonate-bearing iron ore.
Description
Technical field
The invention belongs to the mineral manufacture field, particularly a kind of stepped-flotation separation separation method of carbonate containing iron ore.
Background technology
Along with the Chinese society expanding economy, the quickening of industrialization and urbanization paces increases year by year to the demand of steel products.Developing potential iron ore deposit has become the important topic of mining industry and field of metallurgy.
Since nineteen ninety-six, China's iron and steel output occupies first place in the world always.The develop rapidly that steel and iron industry is produced causes the rapid growth of iron ore demand and production, and iron ore production presents the situation that supply falls short of demand.China became the world maximum country of imported iron ore stone from 2003, and the iron ore import volume was up to 3.83 hundred million tons in 2007.The price of imported iron ore stone in 2008 goes up 65% once more, makes this unprecedented soaring once more at the iron ore price of high position operation.Though country has put into effect some relevant macro adjustment and control policies, with the industry-specific too fast development of suppressing portion, slow down the growth that iron and steel is produced, but quickening along with upgrading, industrialization and the urbanization paces of China's residents consumption pattern, demand to steel products also will continue to increase, steel and iron industry also will continue development, and the situation of a large amount of dependence on import of iron ore is difficult to be reversed in a short time.
The high-grade high-quality iron ore deposit of China is petered out, and the significantly raising of the international iron ore price of the thing followed forces us to develop potential iron ore deposit predictably with strategic eye.The main feature of China's iron ore is " poor ", " carefully ", " mixing ", and average iron grade 32% is than low 11 percentage points of world average grade.The iron ore of China 97.5% needs ore dressing to handle, and the hematite proportion of complicated difficult choosing big (account for iron ore reserves 20.8%).In this case, reasonable, the economic development utilization of hematite have become the focus that people pay close attention to.
The essential mineral that generally contains in the carbonate containing iron ore has bloodstone, magnetic iron ore, quartz, limonite, siderite, ankerite, hornblend and a small amount of chlorite etc.Ferric carbonate in the ore mainly is a siderite, secondly is ankerite.Practice shows, the appearance of ferric carbonate is very big to the influence of iron ore reverse flotation, when the content of ferric carbonate in the iron ore surpasses 4%, floatation indicators is on a declining curve, even the phenomenon that smart tail is regardless of appears, cause the part ore to be effectively addressed, therefore present this ore is not also well utilized.And China's carbonate containing iron ore reserves are abundant, and along with iron ore deposit is deficient day by day, the development and use of carbonate containing iron ore are imperative.The conventional FLOTATION SEPARATION siderite and the method for bloodstone are difficult to obtain the higher bloodstone of grade, and the reagent consumption amount is big, and the rate of recovery is low, and smart tail productive rate is bigger, influences stability of technological process when chats returns.
Summary of the invention
At the technical shortcoming of existing carbonate iron ore flotation, the invention provides a kind of stepped-flotation separation separation method of carbonate containing iron ore.The carbonate containing iron ore is levigate with ball-milling method, adopt low intensity magnetic separation to separate in advance again with high intensity magnetic separation, obtaining to mix magnetic separation of iron ore concentrate adopts the stepped-flotation separation technology to separate, the first step adopts direct floatation process sorting siderite concentrate under neutrallty condition, and second step was adopted reverse floatation process separating hematite concentrate under strong alkaline condition.Technical scheme of the present invention is:
1, mix the acquisition of magnetic separation of iron ore concentrate:
Carbonate containing mineral content 1～6%, ferrous grade are surpassed 25～32% bloodstone stone, at first adopt ball grinder graded method that grinde ore is partly accounted for ore total amount 85%～96% to fineness less than 0.074mm, adopt the method for low intensity magnetic separation and high intensity magnetic separation that ore is separated in advance then, obtain ferrous grade and be 38～45%, carbonate mineral content is 2～8% mixing magnetic separation of iron ore concentrate.
2, will mix magnetic concentrate adopts the stepped-flotation separation technology to carry out sorting:
2.1, adopt direct floatation process sorting siderite concentrate under neutrallty condition:
To add that water sizes mixing to concentration be 20～40% ore pulp with mixing magnetic separation of iron ore concentrate, and ore pulp is sent in the floatation equipment, adds inhibitor and stir 4min, and addition is 400～800g/t; Add collecting agent and stir 4min, addition is 50～300g/t; Carry out direct flotation then, sub-elect the siderite concentrate, the siderite concentrate yield is 13～16%.
2.2, adopt reverse floatation process separating hematite concentrate under strong alkaline condition:
Give the ore deposit with the mine tailing that obtains after the direct floatation process as reverse flotation, add the pH value and be 11～12 the NaOH aqueous solution and size mixing, the concentration of sizing mixing is 30%; Add inhibitor and stir 4min, addition is 150～500g/t; Add activator and stir 4min, addition is 600～1200g/t; Add collecting agent and stir 4min, addition is 800～1500g/t; Send into then in the closed circuit continuous floatation equipment and roughly select, it is that 11～12 the NaOH aqueous solution is sized mixing that the concentrate roughly selected adds the pH value, and the concentration of sizing mixing is 25%; Add inhibitor, activator and collecting agent then and carry out selectedly, the addition of inhibitor, activator and collecting agent is respectively 50～150g/t, 100～300g/t, and 400～800g/t selects hematite concentrate.
The mine tailing of roughly selecting enters to be scanned in the equipment continuously, adding the pH value and be 11～12 the NaOH aqueous solution sizes mixing, the concentration of sizing mixing is 25%, add inhibitor then and carry out once purging selection, the inhibitor addition is 10～50g/t, and the concentrate of once purging selection and selected mine tailing turn back to roughly select in the flotation device to be roughly selected; It is that 11～12 the NaOH aqueous solution is sized mixing that the mine tailing of once purging selection adds the pH value, the concentration of sizing mixing is 25%, adding inhibitor then carries out secondary and scans, the inhibitor addition is 10～30g/t, the concentrate that secondary is scanned turns back to and carries out once purging selection in the once purging selection flotation device, and it is that 11～12 the NaOH aqueous solution is sized mixing that mine tailing that secondary is scanned adds the pH value, and the concentration of sizing mixing is 25%, carry out three times and scan, the concentrate of scanning for three times turns back to and carries out secondary in the secondary scavenging flotation machine and scan.
The stepped-flotation separation separation method of carbonate containing iron ore of the present invention, the first step sub-elects the siderite concentrate, has improved the flotation environment, and second step sub-elected hematite concentrate.This process flow operation is steady, chats do not occur and returns situation of difficult, finally can obtain the iron grade greater than 66%, and the rate of recovery is greater than 62% hematite concentrate.The present invention provides a kind of utilization methods to China's low-grade iron ore potential resource, and is significant for the economical rationality exploitation of carbonate containing iron ore.
Description of drawings
The techniqueflow and the regime of agent schematic diagram of Fig. 1 carbonate containing iron ore stepped-flotation separation separation method.
The specific embodiment
It is conventional corn starch that the invention process adopts inhibitor.
It is CaO, i.e. common lime that the invention process adopts activator.
It is RA715 that the invention process adopts collecting agent, and RA715 provides for Anshan Iron ﹠. Steel Group Corp, and its structural formula is:
XFD-63 type single-channel type flotation device is selected in the test of the invention process direct flotation for use, and the miniature closed circuit continuous flotator of XFLB type is selected in the reverse flotation test for use, and each flotation device mixing speed is 1260r/min.
It is 800r/min that the invention process mixing magnetic separation of iron ore concentrate and reverse flotation are given the mixing speed of sizing mixing in ore deposit.
The carbonate containing mixing magnetic separation of iron ore concentrate that the invention process selects for use eastern Anshan sintering plant to provide, the preparation method of this mixing magnetic separation of iron ore concentrate is: with carbonate containing mineral content 1～6%, ferrous grade surpasses 25～32% bloodstone stone, at first adopt ball grinder graded method that grinde ore is partly accounted for ore total amount 85%～96% to fineness less than 0.074mm, adopt low intensity magnetic separation (drum magnetic separator) with the method for high intensity magnetic separation (Slon pulsating high gradient magnetic separator with vertical ring) ore to be separated in advance then, obtaining ferrous grade is 38～45%, carbonate mineral content is 2～8% mixing magnetic separation of iron ore concentrate.
It is as shown in table 1 to mix the magnetic separation of iron ore concentrate chemical analysis results.
The eastern Anshan of table 1 sintering plant mixing magnetic separation of iron ore concentrate chemical analysis results
| Chemical composition | Full iron grade | Contained FeO | FeCO 3 | FeSiO 3 | Fe 2O 3 | SiO 2 |
| Content (%) | 42.84 | 13.02 | 4.04 | 2.10 | 57.14 | 35.20 |
Remainder is Al
2O
3, CaO, MgO, S and P.
Mix magnetic concentrate characteristic as can be known from this, wherein contain 4.04% the siderite (FeCO of having an appointment
3) and 2.10% ferrosilite mineral (FeSiO
3), be the major influence factors that influences the flotation quality and the rate of recovery.
Embodiment 1
The carbonate containing mixing magnetic separation of iron ore concentrate of selecting for use eastern Anshan sintering plant to provide adopts Fig. 1 technological process to carry out flotation.
To add that water sizes mixing to concentration be 20% ore pulp with mixing magnetic separation of iron ore concentrate, and ore pulp is sent in the floatation equipment, adds inhibitor and stir 4min, and addition is 800g/t; Add collecting agent and stir 4min, addition is 300g/t; Carry out direct flotation then, sub-elect the siderite concentrate, the siderite concentrate yield is 13.31%.
Give the ore deposit with the mine tailing that obtains after the direct floatation process as reverse flotation, add the pH value and be 11 the NaOH aqueous solution and size mixing, the concentration of sizing mixing is 30%; Add inhibitor and stir 4min, addition is 500g/t; Add activator and stir 4min, addition is 1200g/t; Add collecting agent and stir 4min, addition is 1500g/t; Send into then in the closed circuit continuous floatation equipment and roughly select, it is that 11 the NaOH aqueous solution is sized mixing that the concentrate roughly selected adds the pH value, and the concentration of sizing mixing is 25%; Add iron mineral inhibitor, activator and collecting agent then and carry out selectedly, the addition of inhibitor, activator and collecting agent is respectively 150g/t, 300g/t, and 800g/t selects hematite concentrate.
It is that 11 the NaOH aqueous solution is sized mixing that the mine tailing roughly selected adds the pH value, the concentration of sizing mixing is 25%, and enter once purging selection behind the adding inhibitor, the inhibitor addition is 50g/t, the concentrate of once purging selection and selected mine tailing turn back to roughly select in the flotation device to be roughly selected, it is that 11 the NaOH aqueous solution is sized mixing that the mine tailing of once purging selection adds the pH value, the concentration of sizing mixing is 25%, and enter secondary behind the adding inhibitor and scan, the inhibitor addition is 30g/t, the concentrate that secondary is scanned turns back to and carries out once purging selection in the once purging selection flotation device, it is that 11 the NaOH aqueous solution is sized mixing that mine tailing that secondary is scanned adds the pH value, the concentration of sizing mixing is 25%, carries out three times and scans, and the concentrate of scanning for three times turns back to and carries out secondary in the secondary scavenging flotation machine again and scan.
The result of the test that obtains is as shown in table 2.
The continuous flotation experimental results 1 of table 2 stepped-flotation separation
| Name of product | Productive rate (%) | Grade (%) | Iron content | The rate of recovery (%) |
| Raw ore | 100.00 | 42.84 | 4284.0884 | 100.00 |
| The siderite concentrate | 13.31 | 36.66 | 487.9446 | 11.39 |
| Hematite concentrate | 43.87 | 67.84 | 2976.1408 | 69.47 |
| The reverse flotation mine tailing | 42.82 | 19.15 | 820.003 | 19.14 |
| The reverse flotation cleaner tailings | 8.96 | 51.45 | 460.992 | 10.76 |
| The once purging selection concentrate | 24.26 | 48.56 | 1178.0656 | 27.50 |
| The secondary scavenger concentrate | 8.39 | 39.93 | 335.0127 | 7.82 |
| Three scavenger concentrates | 1.12 | 26.20 | 29.344 | 0.68 |
The result adopts the stepped-flotation separation technology can make the concentrate grade of carbonate containing iron ore reach 67.84% as can be known, and the rate of recovery reaches 69.47%.
Embodiment 2
Mixed magnetic separation of iron ore concentrate of the carbonate containing that adopts and technological process are with embodiment 1.
To add that water sizes mixing to concentration be 30% ore pulp with mixing magnetic separation of iron ore concentrate, and ore pulp is sent in the floatation equipment, adds inhibitor and stir 4min, and addition is 400g/t; Add collecting agent and stir 4min, addition is 50g/t; Carry out direct flotation then, sub-elect the siderite concentrate, the siderite concentrate yield is 15.97%.
Give the ore deposit with the mine tailing that obtains after the direct floatation process as reverse flotation, add the pH value and be 11.5 the NaOH aqueous solution and size mixing, the concentration of sizing mixing is 30%; Add inhibitor and stir 4min, addition is 150g/t; Add activator and stir 4min, addition is 600g/t; Add collecting agent and stir 4min, addition is 800g/t; Send into then in the closed circuit continuous floatation equipment and roughly select, it is that 11.5 the NaOH aqueous solution is sized mixing that the concentrate roughly selected adds the pH value, and the concentration of sizing mixing is 25%; Add iron mineral inhibitor, activator and collecting agent then and carry out selectedly, the addition of inhibitor, activator and collecting agent is respectively 50g/t, 100g/t, and 400g/t selects hematite concentrate.
It is that 11.5 the NaOH aqueous solution is sized mixing that the mine tailing roughly selected adds the pH value, and the concentration of sizing mixing is 25%; And enter once purging selection behind the adding inhibitor, the inhibitor addition is 10g/t, the concentrate of once purging selection and selected mine tailing turn back to roughly select in the flotation device to be roughly selected again, it is that 11.5 the NaOH aqueous solution is sized mixing that the mine tailing of once purging selection adds the pH value, the concentration of sizing mixing is 25%, and enter secondary behind the adding inhibitor and scan, the inhibitor addition is 10g/t, the concentrate that secondary is scanned turns back to and carries out once purging selection in the once purging selection flotation device again, it is that 11.5 the NaOH aqueous solution is sized mixing that mine tailing that secondary is scanned adds the pH value, the concentration of sizing mixing is 25%, enters three times and scans, and the concentrate of scanning for three times turns back to and carries out secondary in the secondary scavenging flotation machine again and scan.
The result of the test that obtains is as shown in table 3.
The continuous flotation experimental results 2 of table 3 stepped-flotation separation
| Name of product | Productive rate (%) | Grade (%) | Iron content | The rate of recovery (%) |
| Raw ore | 100.00 | 42.84 | 4284.0884 | 100.00 |
| The siderite concentrate | 15.97 | 37.84 | 604.4849 | 14.11 |
| Hematite concentrate | 40.62 | 66.37 | 2695.9768 | 62.93 |
| The reverse flotation mine tailing | 43.41 | 22.67 | 983.627 | 22.96 |
| The reverse flotation cleaner tailings | 15.80 | 50.87 | 803.695 | 18.76 |
| The once purging selection concentrate | 20.11 | 49.41 | 993.9085 | 23.20 |
| The secondary scavenger concentrate | 2.32 | 39.28 | 91.6795 | 2.14 |
| Three scavenger concentrates | 7.59 | 44.72 | 339.728 | 7.93 |
The result as can be known, the continuous float test of stepped-flotation separation has obtained that concentrate iron grade is 66.37%, the rate of recovery is 62.93% hematite concentrate.Further investigate the trend of siderite in technological process, each product has been carried out the material phase analysis of siderite content, the result is as shown in table 4.
The distribution of each product siderite of the continuous flotation experimental results 2 of table 4 stepped-flotation separation
| Name of product | The siderite concentrate | Hematite concentrate | Continuous flotation tailing | Raw ore |
| FeCO 3Middle Fe content (%) | 6.64 | 0.15 | 1.91 | 1.95 |
| FeCO 3Content (%) | 13.75 | 0.31 | 3.96 | 4.04 |
| FeCO 3Distributive law (%) | 54.34 | 3.12 | 42.54 | 100.00 |
The result as can be known, by first step flotation, 54.34% siderite enters the siderite concentrate, second step during flotation 42.54% siderite be suppressed and enter in the mine tailing, only contain 3.12% siderite in the hematite concentrate.After showing that most of siderite is removed in the first step floatation process, making the siderite content in the reverse flotation feed only is 2.19%, and this part siderite has been not enough to influence the sorting of bloodstone, thereby has improved the flotation conditions of bloodstone.
Embodiment 3
Mixed magnetic separation of iron ore concentrate of the carbonate containing that adopts and technological process are with embodiment 1.
To add that water sizes mixing to concentration be 40% ore pulp with mixing magnetic separation of iron ore concentrate, and ore pulp is sent in the floatation equipment, adds inhibitor and stir 4min, and addition is 600g/t; Add collecting agent and stir 4min, addition is 180g/t; Carry out direct flotation then, sub-elect the siderite concentrate, the siderite concentrate yield is 14.26%.
Give the ore deposit with the mine tailing that obtains after the direct floatation process as reverse flotation, add the pH value and be 12 the NaOH aqueous solution and size mixing, the concentration of sizing mixing is 30%; Add inhibitor and stir 4min, addition is 300g/t; Add activator and stir 4min, addition is 900g/t, adds collecting agent and stirs 4min, and addition is 1100g/t; Send into then in the closed circuit continuous floatation equipment and roughly select, it is that 12 the NaOH aqueous solution is sized mixing that the concentrate roughly selected adds the pH value, and the concentration of sizing mixing is 25%; Add iron mineral inhibitor, activator and collecting agent then and carry out selectedly, the addition of inhibitor, activator and collecting agent is respectively 100g/t, 200g/t, and 600g/t selects hematite concentrate.
It is that 12 the NaOH aqueous solution is sized mixing that the mine tailing roughly selected adds the pH value, the concentration of sizing mixing is 25%, and enter once purging selection behind the adding inhibitor, the inhibitor addition is 30g/t, the concentrate of once purging selection and selected mine tailing turn back to roughly select in the flotation device to be roughly selected, it is that 12 the NaOH aqueous solution is sized mixing that the mine tailing of once purging selection adds the pH value, the concentration of sizing mixing is 25%, and enter secondary behind the adding inhibitor and scan, the inhibitor addition is 20g/t, the concentrate that secondary is scanned turns back to and carries out once purging selection in the once purging selection flotation device, it is that 12 the NaOH aqueous solution is sized mixing that mine tailing that secondary is scanned adds the pH value, the concentration of sizing mixing is 25%, carries out three times and scans, and the concentrate of scanning for three times turns back to and carries out secondary in the secondary scavenging flotation machine and scan.
The result of the test that obtains is as shown in table 5.
The continuous flotation experimental results 3 of table 5 stepped-flotation separation
| Name of product | Productive rate (%) | Grade (%) | Iron content | The rate of recovery (%) |
| Raw ore | 100.00 | 42.84 | 4284.0884 | 100.00 |
| The siderite concentrate | 15.17 | 36.63 | 555.6463 | 12.97 |
| Hematite concentrate | 41.68 | 67.72 | 2822.7858 | 65.89 |
| The reverse flotation mine tailing | 43.76 | 20.88 | 913.796 | 21.33 |
| The reverse flotation cleaner tailings | 14.50 | 51.23 | 742.861 | 17.34 |
| The once purging selection concentrate | 23.47 | 48.71 | 1143.4232 | 26.69 |
| The secondary scavenger concentrate | 5.97 | 39.91 | 238.1953 | 5.56 |
| Three scavenger concentrates | 6.16 | 34.58 | 212.919 | 4.97 |
The result as can be known, the continuous float test of stepped-flotation separation has obtained that concentrate iron grade is 67.72%, the rate of recovery is 65.89% hematite concentrate.
Embodiment 4
Mixed magnetic separation of iron ore concentrate of the carbonate containing that adopts and technological process are with embodiment 1.
To add that water sizes mixing to concentration be 30% ore pulp with mixing magnetic separation of iron ore concentrate, and ore pulp is sent in the floatation equipment, adds inhibitor and stir 4min, and addition is 500g/t; Add collecting agent and stir 4min, addition is 220g/t; Carry out direct flotation then, sub-elect the siderite concentrate, the siderite concentrate yield is 16.18%.
Give the ore deposit with the mine tailing that obtains after the direct floatation process as reverse flotation, add the pH value and be 12 the NaOH aqueous solution and size mixing, the concentration of sizing mixing is 30%; Add inhibitor and stir 4min, addition is 200g/t; Add activator and stir 4min, addition is 900g/t; Add collecting agent and stir 4min, addition is 1300g/t; Send into then in the closed circuit continuous floatation equipment and roughly select, it is that 12 the NaOH aqueous solution is sized mixing that the concentrate roughly selected adds the pH value, and the concentration of sizing mixing is 25%; Add iron mineral inhibitor, activator and collecting agent then and carry out selectedly, the addition of inhibitor, activator and collecting agent is respectively 120g/t, 150g/t, and 500g/t selects hematite concentrate.
It is that 12 the NaOH aqueous solution is sized mixing that the mine tailing roughly selected adds the pH value, the concentration of sizing mixing is 25%, and enter once purging selection behind the adding inhibitor, the inhibitor addition is 20g/t, the concentrate of once purging selection and selected mine tailing turn back to roughly select in the flotation device to be roughly selected, it is that 12 the NaOH aqueous solution is sized mixing that the mine tailing of once purging selection adds the pH value, the concentration of sizing mixing is 25%, and enter secondary behind the adding inhibitor and scan, the inhibitor addition is 25g/t, the concentrate that secondary is scanned turns back to and carries out once purging selection in the once purging selection flotation device, it is that 12 the NaOH aqueous solution is sized mixing that mine tailing that secondary is scanned adds the pH value, the concentration of sizing mixing is 25%, carries out three times and scans, and the concentrate of scanning for three times turns back to and carries out secondary in the secondary scavenging flotation machine and scan.
The result of the test that obtains is as shown in table 6.
The continuous flotation experimental results 4 of table 6 stepped-flotation separation
| Name of product | Productive rate (%) | Grade (%) | Iron content | The rate of recovery (%) |
| Raw ore | 100.00 | 42.84 | 4284.0884 | 100.00 |
| The siderite concentrate | 16.18 | 37.11 | 600.6292 | 14.02 |
| Hematite concentrate | 42.47 | 67.53 | 2868.1972 | 66.59 |
| The reverse flotation mine tailing | 40.55 | 21.49 | 871.3836 | 20.34 |
| The reverse flotation cleaner tailings | 13.98 | 50.62 | 707.731 | 16.52 |
| The once purging selection concentrate | 22.55 | 48.33 | 1089.8721 | 25.44 |
| The secondary scavenger concentrate | 3.26 | 39.04 | 127.2374 | 2.97 |
| Three scavenger concentrates | 5.81 | 41.47 | 240.766 | 5.62 |
The result as can be known, the continuous float test of stepped-flotation separation has obtained that concentrate iron grade is 67.53%, the rate of recovery is 66.59% hematite concentrate.
Embodiment 5
Mixed magnetic separation of iron ore concentrate of the carbonate containing that adopts and technological process are with embodiment 1.
To add that water sizes mixing to concentration be 40% ore pulp with mixing magnetic separation of iron ore concentrate, and ore pulp is sent in the floatation equipment, adds inhibitor and stir 4min, and addition is 700g/t; Add collecting agent and stir 4min, addition is 130g/t; Carry out direct flotation then, sub-elect the siderite concentrate, the siderite concentrate yield is 16.07%.
Give the ore deposit with the mine tailing that obtains after the direct floatation process as reverse flotation, add the pH value and be 12 the NaOH aqueous solution and size mixing, the concentration of sizing mixing is 30%; Add inhibitor and stir 4min, addition is 400g/t; Add activator and stir 4min, addition is 1100g/t; Add collecting agent and stir 4min, addition is 1000g/t; Send into then in the closed circuit continuous floatation equipment and roughly select, it is that 12 the NaOH aqueous solution is sized mixing that the concentrate roughly selected adds the pH value, and the concentration of sizing mixing is 25%; Add iron mineral inhibitor, activator and collecting agent then and carry out selectedly, the addition of inhibitor, activator and collecting agent is respectively 80g/t, 250g/t, and 700g/t selects hematite concentrate.
It is that 12 the NaOH aqueous solution is sized mixing that the mine tailing roughly selected adds the pH value, the concentration of sizing mixing is 25%, and enter once purging selection behind the adding inhibitor, the inhibitor addition is 40g/t, the concentrate of once purging selection and selected mine tailing turn back to roughly select in the flotation device to be roughly selected, it is that 12 the NaOH aqueous solution is sized mixing that the mine tailing of once purging selection adds the pH value, the concentration of sizing mixing is 25%, and enter secondary behind the adding inhibitor and scan, the inhibitor addition is 15g/t, the concentrate that secondary is scanned turns back to and carries out once purging selection in the once purging selection flotation device, it is that 12 the NaOH aqueous solution is sized mixing that mine tailing that secondary is scanned adds the pH value, the concentration of sizing mixing is 25%, carries out three times and scans, and the concentrate of scanning for three times turns back to and carries out secondary in the secondary scavenging flotation machine and scan.
The result of the test that obtains is as shown in table 7.
The continuous flotation experimental results 5 of table 7 stepped-flotation separation
| Name of product | Productive rate (%) | Grade (%) | Iron content | The rate of recovery (%) |
| Raw ore | 100.00 | 42.84 | 4284.0884 | 100.00 |
| The siderite concentrate | 16.07 | 36.92 | 593.3462 | 13.85 |
| Hematite concentrate | 43.89 | 67.07 | 2943.5971 | 68.71 |
| The reverse flotation mine tailing | 42.82 | 22.04 | 943.785 | 22.03 |
| The reverse flotation cleaner tailings | 13.26 | 51.63 | 685.026 | 15.99 |
| The once purging selection concentrate | 23.28 | 49.31 | 1147.7073 | 26.79 |
| The secondary scavenger concentrate | 4.34 | 39.99 | 173.5056 | 4.05 |
| Three scavenger concentrates | 2.34 | 39.18 | 91.679 | 2.14 |
The result as can be known, the continuous float test of stepped-flotation separation has obtained that concentrate iron grade is 67.07%, the rate of recovery is 68.71% hematite concentrate.
Claims (4)
1, a kind of stepped-flotation separation separation method of carbonate containing iron ore, it is characterized in that: the carbonate containing iron ore is levigate with ball-milling method, adopt low intensity magnetic separation to separate in advance again with high intensity magnetic separation, obtaining to mix magnetic separation of iron ore concentrate adopts the stepped-flotation separation technology to separate, the first step adopts direct floatation process sorting siderite concentrate under neutrallty condition, and second step was adopted reverse floatation process separating hematite concentrate under strong alkaline condition; Key step is:
(1) method of described direct floatation process sorting siderite concentrate under neutrallty condition: the mixing magnetic separation of iron ore concentrate that will obtain adds water and sizes mixing, the concentration of sizing mixing is 20～40%, then ore pulp is put into floatation equipment, adding inhibitor and collecting agent successively stirs, carry out direct flotation under the pH neutral condition, the concentrate that direct flotation obtains is the siderite concentrate;
(2) method of described reverse floatation process separating hematite concentrate under strong alkaline condition: give the ore deposit as reverse flotation with the mine tailing that the sorting siderite obtains, size mixing with the NaOH aqueous solution, send into then in the closed circuit continuous floatation equipment, adding inhibitor, activator and collecting agent successively stirs, carrying out reverse flotation roughly selects, concentrate after wherein roughly selecting is sized mixing with the NaOH aqueous solution, adds then to carry out behind inhibitor, activator and the collecting agent selectedly, and the concentrate after selected is a hematite concentrate; Mine tailing after roughly selecting is sized mixing with the NaOH aqueous solution, adds inhibitor then, carries out once purging selection and secondary and scans, and secondary is scanned and directly carried out three times and scan; Wherein the concentrate mixing cleaner tailings of once purging selection returns and roughly selects; Secondary is scanned and is returned once purging selection with the concentrate of scanning for three times and secondary is scanned mine tailing.
2, the method for the stepped-flotation separation of a kind of carbonate containing iron ore according to claim 1 separation, it is characterized in that the NaOH aqueous solution that described reverse flotation is roughly selected is sized mixing, inhibitor, activator and collecting agent: the NaOH pH value of aqueous solution is 11～12, and the concentration of sizing mixing is 30%; Inhibitor is a starch, and consumption is 150～500g/t; Activator is CaO, and consumption is 600～1200g/t; Collecting agent is RA715, and consumption is 800～1500g/t.
3, the method for the stepped-flotation separation of a kind of carbonate containing iron ore according to claim 1 separation, it is characterized in that the described selected NaOH aqueous solution is sized mixing, inhibitor, activator and collecting agent: the NaOH pH value of water solution is 11～12, and the concentration of sizing mixing is 25%; Inhibitor is a starch, and consumption is 50～150g/t; Activator is CaO, and consumption is 100～300g/t; Collecting agent is RA715, and addition is 400～800g/t.
4, the stepped-flotation separation of a kind of carbonate containing iron ore according to claim 1 method of separating, it is characterized in that the NaOH aqueous solution that described once purging selection and secondary are scanned sizes mixing and inhibitor: the NaOH pH value of water solution is 11～12, and the concentration of sizing mixing is 25%; Inhibitor is a starch, and consumption is 10～50g/t.
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