CN102274788B - Hematite stage grinding-magnetic separation-reselection-acid positive flotation process - Google Patents
Hematite stage grinding-magnetic separation-reselection-acid positive flotation process Download PDFInfo
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Abstract
The invention relates to a hematite stage grinding-magnetic separation-reselection-acid positive flotation process which comprises the steps of raw ore, first-stage grinding and first-stage classification. The process is characterized in that the first-stage classification overflow is fed to medium magnetism; the concentrate of the medium magnetism is subjected to rough and fine classification; the tailings of the medium magnetism is fed to strong magnetism after carrying out concentration and deslagging operation before strong magnetism; the strong magnetic ore is subjected to rough and fine classification; a rough particle product obtained by rough and fine classification is reselected; the reselected tailings is subjected to two-stage classification; the middle ore of a trochus is returned to the trochus; the two-stage classification overflow is returned to the medium magnetism; the two-stage classification sank sand is subjected to two-stage grinding; the discharge ore of the two-stage grinding is returned to the two-stage classification; the separated fine particle product is subjected to acid positive flotation operation after concentrated; the flotation concentrate and the reselected concentrate are mixed into final concentrate; and the flotation failings and the strong magnetic tailings are mixed into final tailings for discarding. The invention has the advantages of simple process flow, convenience in control, stable technical index, good effects of energy saving and emission reduction and more ideal effect on processing low-grade ore.
Description
Technical field
The present invention relates to the mine ore dressing field of engineering technology, particularly a kind of bloodstone stage grinding, magnetic separation-gravity treatment-acid direct floatation process.
Background technology
Hematite is the important iron ore type of China.The typical hematite ore-dressing technique of the nineties in last century is stage grinding, coarse and fine separation, gravity treatment-magnetic separation-acid direct flotation.The scalping overflow is divided into thick, thin two kinds of products through the thickness grading operation.Coarse component through thick spiral shell, smart spiral shell, sweep the spiral shell operation and select gravity concentrate, by weak magnetic, middle magnetic jettisoning mine tailing, chats feeds secondary grinding.Secondary grinding is open-circuit grinding, returns the thickness grading operation after two sections Grading Overflows and two sections ball milling ore discharges mix.Fine fraction feeds first magnetic concentration working, selects magnetic concentrate through one section permanent magnetism, dehydration, two sections permanent magnetism, middle magnetic and strong magnetic operations, abandons magnetic tailing, chats feeds flotation operation after concentrated, through one section roughly select, three sections selected, one section scan operation, select flotation concentrate, the jettisoning flotation tailing.Flotation operation is acid direct flotation operation, and adjusting agent is sulfuric acid, and collecting agent is petroleum sodium sulfonate.The deficiency that this technological process exists is: 1, (-200 order grain size contents account for 50～70% to one section Grading Overflow, iron mineral and gangue mineral liberation degree of minerals are higher than 50%) can directly throw tail by the magnetic separation way fully, and needn't pass through thickness grading, thick spiral shell and sweep the spiral shell operation, therefore cause its complex process, waste energy, it is low to sort efficient; 2, open-circuit grinding is adopted in the secondary grinding operation, and granularity is unstable, causes easily the process indicator fluctuation; 3, the particulate work flow is unreasonable, and the grade of magnetic concentrate and flotation concentrate is 60～62%, causes comprehensive concentrate grade only to reach 63～63.5%.This technique is eliminated gradually.
Hematite adopts stage grinding, coarse and fine separation, gravity treatment-strong magnetic-anion reverse floatation technique to carry out mineral processing production more at present.The scalping overflow is divided into thick, thin two kinds of products through the thickness grading operation.Coarse component through thick spiral shell, smart spiral shell, sweep the spiral shell operation and select gravity concentrate, by weak magnetic, middle magnetic jettisoning mine tailing, chats feeds secondary grinding.Secondary grinding is open-circuit grinding, returns the thickness grading operation after two sections Grading Overflows and two sections ball milling ore discharges mix.Fine fraction is thrown tail by middle magnetic, strong magnetic and feed alkaline reverse flotation work after being concentrated, through one section roughly select, one section selected, three sections scan operation, select flotation concentrate, the jettisoning flotation tailing.Although this technological process brings up to 65-67.5% with comprehensive concentrate grade, but also come with some shortcomings: 1, (-200 order grain size contents account for 50～70% to one section Grading Overflow, iron mineral and gangue mineral liberation degree of minerals are higher than 50%) also can directly throw tail by the magnetic separation way, and needn't pass through thickness grading, thick spiral shell and sweep the spiral shell operation, therefore cause its complex process, waste energy, it is low to sort efficient; 2, open-circuit grinding is adopted in the secondary grinding operation equally, and granularity is unstable, causes easily the process indicator fluctuation; 3, the floating agent kind is more, generally has four kinds: adjusting agent alkali, inhibitor cornstarch, activator lime and collecting agent fatty acid anion organic matter.The transportation of medicament, storage, preparation, interpolation are cumbersome, and lime lost efficacy easily, and it is nervous that cornstarch belongs to grain class source; 4, the concentrate pH value is generally more than 10, and ore pulp is very sticking, and filtering means dehydration is difficulty relatively, must adopt acid adding that its pH value is reduced to 7～8 in the industrial production and remove the method that cornstarch are adsorbed on the concentrate surface and improve the filtering means dehydration effect.
Summary of the invention
Order of the present invention has and provides a kind of bloodstone stage grinding, magnetic separation-gravity treatment-acid direct floatation process that improves concentrate grade, reduces beneficiation cost.
The objective of the invention is to realize by following technical proposals:
Bloodstone stage grinding of the present invention, magnetic separation-gravity treatment-acid direct floatation process comprise raw ore → primary grinding → one section classification, it is characterized in that the overflow of described one section classification feeds middle magnetic, strong magnetic, throw in advance tail; Secondary grinding is closed circuit grinding, and the secondary grinding ore discharge returns two sections graded operations; Flotation operation is acid direct flotation operation, and concrete steps are as follows:
1) be that 20-30% ,-200 order grain size contents reach one section Grading Overflow of 50-70% and feed middle magnetic with grade,
2) concentrate of magnetic feeds thickness grading in, and the mine tailing of middle magnetic concentrates before feeding strong magnetic,
3) concentrated overflow is abandoned before the strong magnetic, and the front concentrated underflow of strong magnetic feeds strong magnetic after the slagging-off operation,
4) be that 35-40% high intensity magnetic mineral also feeds thickness grading with grade, grade is that 7-9% strong magnetic tail ore deposit is abandoned,
5) grade told of thickness grading is that the coarse grain product of 38-44% ,-200 order grain size contents 35-50% feeds thick spiral shell,
The grade of telling is to concentrate operation before the particulate product of 33-38% ,-200 order grain size contents more than 85% feeds flotation,
6) concentrate of thick spiral shell feeds smart spiral shell,
7) concentrate of smart spiral shell is gravity concentrate, and its grade is 63-66.5%, and the mine tailing of thick spiral shell and the mixing of the mine tailing of smart spiral shell feed two sections classifications, and its grade is 34-40% ,-200 order grain size contents 30-35%, and the chats of smart spiral shell turns back to smart spiral shell,
8) overflow of two sections classifications turns back to middle magnetic, and the sand setting of two sections classifications feeds secondary grinding,
9) ore discharge of secondary grinding turns back to two sections classifications,
10) concentrated overflow is abandoned before the flotation, and underflow concentrated before the flotation feeds roughly selecting of acid direct flotation operation, and its concentration brings up to 45-55% by 10-20%,
11) concentrate of roughly selecting feed one section selected, the mine tailing of roughly selecting feeds one section and scans,
12) one section selected concentrate feed two sections selected,
13) two sections selected concentrate are flotation concentrate, its grade be 65-68.5%, two sections selected mine tailings turn back to one section selected,
14) flotation concentrate and gravity concentrate are mixed into final concentrate, and its grade is 65-67.5%,
15) one section concentrate of scanning mixes to turn back to one section selected mine tailing and roughly selects, and one section mine tailing of scanning feeds two sections and scans,
16) two sections concentrate of scanning turn back to one section and scan, and two sections mine tailings of scanning are flotation tailing, and its grade is 13-16%,
17) flotation tailing is mixed into true tailings with strong magnetic tail ore deposit and abandons, and its grade is 10-13%.
The magnetic induction intensity of described middle magnetic is 0.4-0.6T.
The background magnetic induction intensity of described strong magnetic is 0.8-1.5T.
The advantage of bloodstone stage grinding of the present invention, magnetic separation-gravity treatment-acid direct floatation process is:
1, middle magnetic, strong magnetic operation are located at one section classification after, throw in advance tail, be conducive to alleviate the load of subsequent job, shortened process reduces beneficiation cost;
2, secondary grinding adopts closed circuit grinding, has guaranteed the particle size stable of secondary grinding operation, promotes the stable of whole process indicator;
3, the floating agent kind is simple, only has two kinds of adjusting agent sulfuric acid and collecting agent petroleum sodium sulfonates.The transportation of medicament, storage, preparation, interpolation are all fairly simple, and wide material sources;
4, the concentrate pH value is generally neutrality, ore pulp mobile fine, directly filtering means dehydration.
Technological process of the present invention is simple, be convenient to control, and technical indicator is stable, energy-saving and emission-reduction effective.The effect of processing poor value is even more ideal.
Description of drawings
Fig. 1 is process chart of the present invention.
The specific embodiment
Below in conjunction with description of drawings the specific embodiment of the present invention.
As shown in Figure 1, bloodstone stage grinding of the present invention, magnetic separation-gravity treatment-acid direct floatation process comprise raw ore → primary grinding → one section classification, it is characterized in that the overflow of described one section classification feeds middle magnetic, strong magnetic, throw in advance tail; Secondary grinding is closed circuit grinding, and the secondary grinding ore discharge returns two sections graded operations; Flotation operation is acid direct flotation operation, and concrete steps are as follows:
1) be that 20-30% ,-200 order grain size contents reach one section Grading Overflow of 50-70% and feed middle magnetic with grade, magnetic induction intensity of magnetic is 0.4-0.6T in this,
2) concentrate of magnetic feeds thickness grading in, and the mine tailing of middle magnetic concentrates before feeding strong magnetic,
3) concentrated overflow is abandoned before the strong magnetic, and the front concentrated underflow of strong magnetic feeds strong magnetic after the slagging-off operation, and the background magnetic induction intensity of this strong magnetic is 0.8-1.5T,
4) be that 35-40% high intensity magnetic mineral also feeds thickness grading with grade, grade is that 7-9% strong magnetic tail ore deposit is abandoned,
5) grade told of thickness grading is that the coarse grain product of 38-44% ,-200 order grain size contents 35-50% feeds thick spiral shell, and the grade of telling is that the particulate product of 33-38% ,-200 order grain size contents more than 85% feeds concentrated operation before the flotation,
6) concentrate of thick spiral shell feeds smart spiral shell,
7) concentrate of smart spiral shell is gravity concentrate, and its grade is 63-66.5%, and the mine tailing of thick spiral shell and the mixing of the mine tailing of smart spiral shell feed two sections classifications, and its grade is 34-40% ,-200 order grain size contents 30-35%, and the chats of smart spiral shell turns back to smart spiral shell,
8) overflow of two sections classifications turns back to middle magnetic, and the sand setting of two sections classifications feeds secondary grinding,
9) ore discharge of secondary grinding turns back to two sections classifications,
10) concentrated overflow is abandoned before the flotation, and underflow concentrated before the flotation feeds roughly selecting of acid direct flotation operation, and its concentration brings up to 45-55% by 10-20%,
11) concentrate of roughly selecting feed one section selected, the mine tailing of roughly selecting feeds one section and scans,
12) one section selected concentrate feed two sections selected,
13) two sections selected concentrate are flotation concentrate, its grade be 65-68.5%, two sections selected mine tailings turn back to one section selected,
14) flotation concentrate and gravity concentrate are mixed into final concentrate, and its grade is 65-67.5%,
15) one section concentrate of scanning mixes to turn back to one section selected mine tailing and roughly selects, and one section mine tailing of scanning feeds two sections and scans,
16) two sections concentrate of scanning turn back to one section and scan, and two sections mine tailings of scanning are flotation tailing, and its grade is 13-16%,
17) flotation tailing is mixed into true tailings with strong magnetic tail ore deposit and abandons, and its grade is 10-13%.
Technological process of the present invention is simple, be convenient to control, and technical indicator is stable, energy-saving and emission-reduction effective.The effect of processing poor value is even more ideal.
Claims (3)
1. a bloodstone stage grinding, magnetic separation-gravity treatment-acid direct floatation process comprise raw ore → primary grinding → one section classification, it is characterized in that the overflow of described one section classification feeds middle magnetic, strong magnetic, throw in advance tail; Secondary grinding is closed circuit grinding, and the secondary grinding ore discharge returns two sections graded operations; Flotation operation is acid direct flotation operation, and concrete steps are as follows:
1) be that 20-30% ,-200 order grain size contents reach one section Grading Overflow of 50-70% and feed middle magnetic with grade,
2) concentrate of magnetic feeds thickness grading in, and the mine tailing of middle magnetic concentrates before feeding strong magnetic,
3) concentrated overflow is abandoned before the strong magnetic, and the front concentrated underflow of strong magnetic feeds strong magnetic after the slagging-off operation,
4) be that 35-40% high intensity magnetic mineral also feeds thickness grading with grade, grade is that 7-9% strong magnetic tail ore deposit is abandoned,
5) grade told of thickness grading is that the coarse grain product of 38-44% ,-200 order grain size contents 35-50% feeds thick spiral shell,
The grade of telling is to concentrate operation before the particulate product of 33-38% ,-200 order grain size contents more than 85% feeds flotation,
6) concentrate of thick spiral shell feeds smart spiral shell,
7) concentrate of smart spiral shell is gravity concentrate, and its grade is 63-66.5%, the mine tailing of thick spiral shell and the mine tailing of smart spiral shell mix to
Enter two sections classifications, its grade is 34-40% ,-200 order grain size contents 30-35%, and the chats of smart spiral shell turns back to smart spiral shell,
8) overflow of two sections classifications turns back to middle magnetic, and the sand setting of two sections classifications feeds secondary grinding,
9) ore discharge of secondary grinding turns back to two sections classifications,
10) concentrated overflow is abandoned before the flotation, and underflow concentrated before the flotation feeds roughly selecting of acid direct flotation operation, and it is dense
Degree brings up to 45-55% by 10-20%,
11) concentrate of roughly selecting feed one section selected, the mine tailing of roughly selecting feeds one section and scans,
12) one section selected concentrate feed two sections selected,
13) two sections selected concentrate are flotation concentrate, its grade be 65-68.5%, two sections selected mine tailings turn back to one section selected,
14) flotation concentrate and gravity concentrate are mixed into final concentrate, and its grade is 65-67.5%,
15) one section concentrate of scanning mixes to turn back to one section selected mine tailing and roughly selects, and one section mine tailing of scanning feeds two sections and scans,
16) two sections concentrate of scanning turn back to one section and scan, and two sections mine tailings of scanning are flotation tailing, and its grade is 13-16%,
17) flotation tailing is mixed into true tailings with strong magnetic tail ore deposit and abandons, and its grade is 10-13%.
2. bloodstone stage grinding according to claim 1, magnetic separation-gravity treatment-acid direct flotation worker
Skill, the magnetic induction intensity that it is characterized in that described middle magnetic is 0.4-0.6T.
3. bloodstone stage grinding according to claim 1, magnetic separation-thickness grading-gravity treatment-acid direct floatation process, the background magnetic induction intensity that it is characterized in that described strong magnetic is 0.8-1.5T.
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| CN103272680B (en) * | 2013-06-13 | 2014-12-10 | 鞍钢集团矿业公司 | Gravity regrinding technology capable of improving balling performance of hematite ore concentrates |
| CN104722393B (en) * | 2015-03-19 | 2017-11-17 | 长沙矿冶研究院有限责任公司 | A kind of beneficiation method for improving the microfine speculum iron rate of recovery |
| CN109158204A (en) * | 2018-07-03 | 2019-01-08 | 昆明理工大学 | A kind of high-sulfur bloodstone selects iron sulphur removal enrichment method |
| CN109013037B (en) * | 2018-09-28 | 2020-02-11 | 安徽马钢张庄矿业有限责任公司 | Magnetite beneficiation process for improving coarse fraction tailing content and mill processing capacity |
| CN110026288A (en) * | 2019-04-19 | 2019-07-19 | 昆明理工大学 | A kind of short route new process using high-gradient magnetic separation and centrifuge graded shot bloodstone |
| CN111450990A (en) * | 2020-05-13 | 2020-07-28 | 江西理工大学 | Gravity separation system and chromite beneficiation method |
| CN113680534B (en) * | 2021-08-30 | 2023-05-02 | 东北大学 | Fine iron mineral collector and method for asynchronous flotation of coarse and fine iron ore containing carbonate |
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Address after: 114001 Anshan District, Liaoning, No. 219 Road, No. 39, Tiedong Patentee after: Anshan Iron and Steel Group Mining Co., Ltd. Address before: 114001 Anshan District, Liaoning, No. 219 Road, No. 39, Tiedong Patentee before: Angang Group Mine Company |