CN103215437A - Method for producing beaded iron by using nickel slag, blast furnace gas ash and steel OG mud - Google Patents
Method for producing beaded iron by using nickel slag, blast furnace gas ash and steel OG mud Download PDFInfo
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- CN103215437A CN103215437A CN2013100857265A CN201310085726A CN103215437A CN 103215437 A CN103215437 A CN 103215437A CN 2013100857265 A CN2013100857265 A CN 2013100857265A CN 201310085726 A CN201310085726 A CN 201310085726A CN 103215437 A CN103215437 A CN 103215437A
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Abstract
The invention provides a method for producing beaded iron by using nickel slag, blast furnace gas ash and steel OG mud. The method mainly includes the following steps: (1) mixing nickel slag subjected to ore grinding with dried blast furnace gas ash and dehydrated steelmaking OG mud; and controlling a molar ratio of carbon to iron, zinc, and oxygen in nickel oxide at 1:1.2-1.5; (2) adding a binder in the mixture, preparing the mixture into pellets, and drying or air-drying the pellets; and (3) sending the raw material pellets into a rotary hearth furnace for reduction with reduction temperature of 1200-1450 DEG C for 20-50min; and conducting cooling and magnetic separation on the materials after reduction to obtain beaded iron and slag. The method provided by the invention the recycles useful elements such iron, nickel and zinc in the three industrial by-products to the maximum, so as to digest the solid wastes from nonferrous enterprises and iron and steel enterprises to reduce the pressure on environmental protection, as well as increase economic benefits.
Description
Technical field
The invention belongs to the smelting iron and steel technical field, relate to a kind of method of utilizing nickel slag, blast furnace dust and the production of steel-making OG mud to contain nickel bead iron.
Background technology
China's pig iron output in 2011 reaches 6.29 hundred million tons, but the iron ore degree of self-sufficiency only is 65%, every year need be from external a large amount of imported iron ore stones, and only 2011 from just nearly 6.82 hundred million tons in external imported iron ore stone, we can say iron ore in short supply will be the resource situation that Iron and Steel Enterprises in China will face from now on for a long time.Meanwhile, the industry byproduct of useful elements such as iron content, nickel, carbon such as the nickel slag that produces in some smelter production processes, blast furnace dust, owing to can not effectively utilize for a long time, throw aside in a large number and pile up, not only caused the huge waste of metals resources, and its discharging also produces great influence to area ecological environment.
The nickel slag iron content 31～40% that coloured industry production produces, nickeliferous 0.1～0.4% because its iron grade is low, foreign matter content is high, is directly used uneconomical at blast furnace; And phase transformation has taken place through melting in it, can't handle with the method for ore dressing, therefore can't effectively utilize always.Be example with Jinchuan, Gansu group company only, more than 160 ten thousand tons of the annual nickel slags that produces add up volume of cargo in storage at present and have reached more than 3,000 ten thousand tons.Utilize owing to can not get for a long time imitating, a large amount of nickel slags is thrown aside and is piled up, and has not only caused the huge waste of metals resources, and owing to be located in typical ecologically fragile areas, its discharging also produces great influence to area ecological environment.
Blast furnace dust is the dedusting ash that produces in the steel-making blast furnace flue gas system dust removal process, and its main component is about Fe(30%) and C(33% about).The traditional treatment process of blast furnace dust is to join sintered material, supplies with blast furnace again after burning till agglomerate; The problem that this treatment process exists is, caused the circulation enrichment of zinc in blast furnace, destroyed blast furnace lining, had a strong impact on blast furnace campaign, loses more than gain, and domestic a lot of iron and steel enterprises iron work refusal uses the high gas ash of zinc content at present.Wine steel group company is an example with Gansu, contains the higher blast furnace dust of zinc and has stopped in the sintering at present and use, and all store up now annual blast furnace dust 8～90,000 that produce of company ton, has caused secondary environmental pollution.
Steel-making OG mud is the dedusting ash that produces in the steel-making converter flue gas system dust removal process, pulls out through the settling tank post precipitation, and its main component is about Fe(50%) and CaO(17% about).The treatment process of OG mud, most of iron and steel enterprise joins sintered material, supplies with blast furnace again after burning till agglomerate, because OG mud viscosity is big, is difficult for mixing, and the composition fluctuation is big, with addition of after easily sintering process is caused disadvantageous effect.
At present, also lack above three kinds of researchs that industrial waste fully utilizes.
Summary of the invention
The objective of the invention is to utilize at nickel slag as nickel smelting by-product product, the present situation that blast furnace dust, steel-making OG mud are difficult to utilize, a kind of method of utilizing nickel slag, blast furnace dust and the production of steel-making OG mud to contain nickel bead iron has been proposed, to recycle useful elements such as three kinds of iron, nickel, zinc in the industry byproduct to greatest extent, reach the purpose of comprehensive utilization of waste material, energy-saving and emission-reduction.
For this reason, the present invention adopts following technical scheme:
A kind of method of utilizing nickel slag, blast furnace dust and the production of steel-making OG mud to contain nickel bead iron comprises following processing step:
(1) with the nickel slag behind the ore grinding and dried blast furnace dust and the steel-making OG mud after dehydrating mix, and the ratio that makes the molar weight of oxygen in the molar weight of carbon in the mixed material and iron, zinc, the nickel oxide is between 1:1.2-1.5, and basicity is between 0.8-1.2; Basicity of the present invention refers to CaO and SiO
2Between mol ratio;
(2) add binding agent and compound is made into pelletizing in compound, the pelletizing for preparing carries out drying by hot blast or places certain hour and carry out natural air drying, and the moisture content in the pelletizing is reduced to below 4%;
(3) the raw material pelletizing is sent into rotary hearth furnace and reduce, reduction temperature is 1200-1450 ℃, and the recovery time is 20-50min, and the material after the reduction obtains pearl iron and slag through overcooling, magnetic separation.
In the step (3), contain the nickel of 0.2%-1.5% in the described pearl iron, and 0.01% following molybdenum and 0.03% following vanadium.
In the step (3), raw material when reduction will through gravitational precipitator receive dedusting ash return step (2) and carry out pelletizing and make; Will through bagroom receive the raw material that the thin ash of zinc smelts as zinc that contains use.
In the step (3), the temperature in control rotary hearth furnace discharging zone is at 650～900 ℃.
In the step (2), described binding agent is wilkinite or cement.
In step (3) reduction process, utilize carbon in the blast furnace dust as reductive agent, the ferriferous oxide in the pelletizing is reduced into metallic iron; In addition, because the carburetion of the fixed carbon of blast furnace dust in the pelletizing is in a liquid state the iron that restores under reductive condition.After being reduced, nickel oxide in rotary hearth furnace in the compound nickel slag then enters into molten iron, owing to often contain valuable elements such as molybdenum, vanadium in the nickel slag, therefore also contain elements such as micro-molybdenum, vanadium simultaneously in the product pearl iron, therefore the finished product can be used as and produce stainless raw material, can reduce stainless production cost significantly.This product can also be supplied with the stainless steel converter as the substitute of steel scrap and use, and also can pass through electrosmelting, uses as other purposes after the removal of impurities.
Zinc oxide in the blast furnace dust is reduced, and generates zinc fume, and zinc fume enters into the rotary hearth furnace dust-removal system, the oxidized again zinc gray that becomes of zinc in this process.Owing to added a certain amount of steel-making OG mud, make the interior slag (mainly referring to the composition outside deironing, zinc, nickel oxide and the carbon) of pelletizing in reduction process, absorb the sulphur of some amount, make slag in reduction highest temperature zone liquefy simultaneously, the temperature province temperature reduces in the rotary hearth furnace subsequently, slag separates with pearl iron, arrives the discharging zone, and the discharge zone temperature is controlled at below 900 ℃, slag after guaranteeing to reduce and pearl iron all are frozen into solid-state, discharge burner hearth by rotary hearth furnace discharging equipment then.
The beneficial effects of the utility model are: 1, proposed a kind of scheme of nickel slag recycling, can effectively extract valuable elements such as iron in the nickel slag, nickel.2, utilize carbon in the blast furnace dust as reductive agent, both utilized carbon wherein, the reduction of the zinc in the gas ash can be collected the back by fly-ash separator and used as there being valency raw material supplying zinc to smelt again.3, utilize CaO allotment basicity in the steel-making OG mud, the consumption of both having saved Wingdale has realized the recycling approach of steel-making OG mud again.4, produce nickeliferous pearl iron by rotary hearth furnace reduction, this product can substitute steel scrap as producing stainless raw material, can reduce stainless production cost significantly.5, utilize the reasonably combined of three kinds of valuable elements in the solid waste, produce the added value high product, the solid waste of both dissolved coloured enterprise and iron and steel enterprise, reduced environmental protection pressure, increased economic benefit again.
Description of drawings
Fig. 1 is a process flow sheet of the present invention.
Embodiment
Following embodiment material effective component sees Table 1.
Table 1 embodiment material effective component contains scale (%)
| Composition | Fe 2O 3 | FeO | S | P | SiO 2 | CaO | MgO |
| The nickel slag | 1.11 | 51.43 | 1.05 | 0.014 | 34.83 | 1.64 | 6.51 |
| Gas ash | 31.26 | 8.86 | 1.07 | 0.046 | 6.86 | 5.15 | 1.62 |
| OG mud | 11.86 | 58.32 | 0.099 | 0.247 | 5.83 | 17.02 | 2.45 |
| Composition | Ni | MnO | ZnO | K 2O | Na 2O | Al 2O 3 | C |
| The nickel slag | 0.131 | 0.1 | ﹨ | 0.294 | 0.180 | 1.72 | ﹨ |
| Gas ash | ﹨ | 0.42 | 7.13 | 0.79 | 0.053 | 3.36 | 33.12 |
| OG mud | ﹨ | 2.09 | ﹨ | 0.159 | 0.075 | 0.93 | ﹨ |
Annotate: only listed the effective constituent of raw material in the table, surplus is trace element and impurity.
Embodiment 1
The present embodiment production craft step is as follows:
(1) the steel-making OG mud of the nickel slag behind fragmentation, screening, the ore grinding with dried blast furnace dust and after dehydrating is mixed, and the ratio of the molar weight of oxygen in the molar weight that makes carbon in the mixed material and iron, zinc, the nickel oxide: 1:1.2, basicity is 1.0; Wherein, the molar weight of oxygen can be directly drawn by the content of table 1 iron, zinc oxide in iron, the zinc oxide, and nickel oxide only exists with the NiO form, so the molar weight of oxygen also can be drawn by the cubage of nickel in the table 1 in the nickel oxide, down with;
(2) add an amount of wilkinite and be made into pelletizing in compound, the pelletizing for preparing carries out drying by hot blast or places certain hour and carry out natural air drying, and the moisture content in the pelletizing is reduced to below 4%;
(3) the raw material pelletizing being sent into rotary hearth furnace reduces, reduction temperature is 1200-1350 ℃, recovery time is 50min, during reduction will through gravitational precipitator receive dedusting ash return step (2) and carry out pressure ball, will through bagroom receive the raw material that the thin ash of zinc smelts as zinc that contains use; The temperature in control rotary hearth furnace discharging zone is at 800-900 ℃; Material after the reduction obtains pearl iron and slag through overcooling, magnetic separation, wherein, contains 0.2% nickel in the product pearl iron, and the vanadium of 0.008% molybdenum and 0.03%.
Embodiment 2
The present embodiment production craft step is as follows:
(1) the steel-making OG mud of the nickel slag behind fragmentation, screening, the ore grinding with dried blast furnace dust and after dehydrating is mixed, and the ratio of the molar weight of oxygen in the molar weight that makes carbon in the mixed material and iron, zinc, the nickel oxide: 1:1.3, basicity is 0.8;
(2) add an amount of cement and be made into pelletizing in compound, the pelletizing for preparing carries out drying by hot blast or places certain hour and carry out natural air drying, and the moisture content in the pelletizing is reduced to below 4%;
(3) the raw material pelletizing being sent into rotary hearth furnace reduces, reduction temperature is 1300-1400 ℃, recovery time is 30min, during reduction will through gravitational precipitator receive dedusting ash return step (2) and carry out pelletizing and make, will through bagroom receive the raw material that the thin ash of zinc smelts as zinc that contains use; The temperature in control rotary hearth furnace discharging zone is at 750-850 ℃; Material after the reduction obtains pearl iron and slag through overcooling, magnetic separation, wherein, contains 0.8% nickel in the product pearl iron, and the vanadium of 0.01% molybdenum and 0.02%.
Embodiment 3
The present embodiment production craft step is as follows:
(1) the steel-making OG mud of the nickel slag behind fragmentation, screening, the ore grinding with dried blast furnace dust and after dehydrating is mixed, and the ratio of the molar weight of oxygen in the molar weight that makes carbon in the mixed material and iron, zinc, the nickel oxide: 1:1.5, basicity is 1.2;
(2) add an amount of cement and be made into pelletizing in compound, the pelletizing for preparing carries out drying by hot blast or places certain hour and carry out natural air drying, and the moisture content in the pelletizing is reduced to below 4%;
(3) the raw material pelletizing being sent into rotary hearth furnace reduces, reduction temperature is 1350-1450 ℃, recovery time is 20min, during reduction will through gravitational precipitator receive dedusting ash return step (2) and carry out pelletizing and make, will through bagroom receive the raw material that the thin ash of zinc smelts as zinc that contains use; The temperature in control rotary hearth furnace discharging zone is at 650-800 ℃; Material after the reduction obtains pearl iron and slag through overcooling, magnetic separation, wherein, contains 1.5% nickel in the product pearl iron, and the vanadium of 0.006% molybdenum and 0.015%-0.024%.
Claims (5)
1. a method of utilizing nickel slag, blast furnace dust and the production of steel-making OG mud to contain nickel bead iron is characterized in that, comprises following processing step:
(1) with the nickel slag behind the ore grinding and dried blast furnace dust and the steel-making OG mud after dehydrating mix, and the ratio that makes the molar weight of oxygen in the molar weight of carbon in the mixed material and iron, zinc, the nickel oxide is between 1:1.2-1.5, and basicity is between 0.8-1.2;
(2) add binding agent and compound is made into pelletizing in compound, the pelletizing for preparing carries out drying by hot blast or places certain hour and carry out natural air drying, and the moisture content in the pelletizing is reduced to below 4%;
(3) the raw material pelletizing is sent into rotary hearth furnace and reduce, reduction temperature is 1200-1450 ℃, and the recovery time is 20-50min, and the material after the reduction obtains pearl iron and slag through overcooling, magnetic separation.
2. a kind of method of utilizing nickel slag, blast furnace dust and the production of steel-making OG mud to contain nickel bead iron according to claim 1 is characterized in that, in the step (3), contains the nickel of 0.2%-1.5% in the described pearl iron, and 0.01% following molybdenum and 0.03% following vanadium.
3. a kind of method of utilizing nickel slag, blast furnace dust and the production of steel-making OG mud to contain nickel bead iron according to claim 1, it is characterized in that, in the step (3), raw material when reduction will through gravitational precipitator receive dedusting ash return step (2) and carry out pelletizing and make; Will through bagroom receive the raw material that the thin ash of zinc smelts as zinc that contains use.
4. a kind of method of utilizing nickel slag, blast furnace dust and the production of steel-making OG mud to contain nickel bead iron according to claim 1 is characterized in that in the step (3), the temperature in control rotary hearth furnace discharging zone is at 650～900 ℃.
5. a kind of method of utilizing nickel slag, blast furnace dust and the production of steel-making OG mud to contain nickel bead iron according to claim 1 is characterized in that in the step (2), described binding agent is wilkinite or cement.
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| CN2013100857265A CN103215437A (en) | 2013-03-18 | 2013-03-18 | Method for producing beaded iron by using nickel slag, blast furnace gas ash and steel OG mud |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104004874A (en) * | 2014-06-06 | 2014-08-27 | 甘肃酒钢集团宏兴钢铁股份有限公司 | Combined direct reduction technology of blast furnace gas ash and refractory low-grade iron ore in tunnel kiln |
| CN105695731A (en) * | 2016-02-18 | 2016-06-22 | 浙江新时代中能循环科技有限公司 | Method for producing nickel iron fine powder and zinc oxide through rotary kiln |
| CN106367600A (en) * | 2016-08-29 | 2017-02-01 | 甘肃酒钢集团宏兴钢铁股份有限公司 | Method for treating high-zinc iron-containing slime through utilizing rotary kiln |
| CN108704762A (en) * | 2018-05-07 | 2018-10-26 | 甘肃酒钢集团宏兴钢铁股份有限公司 | A kind of blast furnace dust magnetic kind magnetization dry separation iron-extracting process |
| CN115109885A (en) * | 2022-07-06 | 2022-09-27 | 湖北理工学院 | Microwave coreduction of gas ash and Bayer process red mud to prepare iron-silicon alloy and separate Al 2 O 3 Method (2) |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104004874A (en) * | 2014-06-06 | 2014-08-27 | 甘肃酒钢集团宏兴钢铁股份有限公司 | Combined direct reduction technology of blast furnace gas ash and refractory low-grade iron ore in tunnel kiln |
| CN105695731A (en) * | 2016-02-18 | 2016-06-22 | 浙江新时代中能循环科技有限公司 | Method for producing nickel iron fine powder and zinc oxide through rotary kiln |
| CN105695731B (en) * | 2016-02-18 | 2018-04-10 | 浙江新时代中能循环科技有限公司 | Rotary kiln produces ferronickel fine powder and the method for zinc oxide |
| CN106367600A (en) * | 2016-08-29 | 2017-02-01 | 甘肃酒钢集团宏兴钢铁股份有限公司 | Method for treating high-zinc iron-containing slime through utilizing rotary kiln |
| CN108704762A (en) * | 2018-05-07 | 2018-10-26 | 甘肃酒钢集团宏兴钢铁股份有限公司 | A kind of blast furnace dust magnetic kind magnetization dry separation iron-extracting process |
| CN115109885A (en) * | 2022-07-06 | 2022-09-27 | 湖北理工学院 | Microwave coreduction of gas ash and Bayer process red mud to prepare iron-silicon alloy and separate Al 2 O 3 Method (2) |
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Application publication date: 20130724 |