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Method for separating and reducing iron powder from refractory mineral, complex ore and iron-containing waste materials

A technology for reducing iron powder and compound ore, applied in the field of metallurgy, can solve the problems of low product quality, high labor consumption, high energy consumption, and achieve the effect of high recovery rate

Inactive Publication Date: 2015-11-04
唐竹胜
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, due to the traditional coal-based tunnel kiln tank method, expensive refractory tanks must be used; at the same time, it has high energy consumption, long reduction time, high labor consumption, and low product quality, resulting in practical problems such as high production costs and poor sales.
At present, the production of reduced iron by coal-based tunnel kiln method is at a standstill

Method used

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  • Method for separating and reducing iron powder from refractory mineral, complex ore and iron-containing waste materials
  • Method for separating and reducing iron powder from refractory mineral, complex ore and iron-containing waste materials
  • Method for separating and reducing iron powder from refractory mineral, complex ore and iron-containing waste materials

Examples

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Effect test

Embodiment 1

[0027] A method for separating and reducing iron powder from refractory ore, compound ore and iron-containing waste, the steps are as follows:

[0028] (1) select 200 orders and account for 90%, grade TFe:56.46% Inner Mongolia sulfate slag ore powder, add reductant, auxiliary agent and bentonite, the weight ratio of described ore powder, reductant, auxiliary agent and bentonite is 65: 22:12:1.0, then add quartz sand with a particle size of 3-6mm and 5% of the mass of mineral powder, and scrap steel chips with a length of 3-10mm and 5% of the mass of mineral powder, and mix evenly;

[0029] (2) Spray 5.0% water of mineral powder mass in the mixed mineral powder of step (1), make mineral powder into bricks of 230×115×65mm, spray a layer of 1.5mm on the surface of mineral powder bricks after drying Thick refractory coating layer, dry in a drying kiln at 180°C for 4.0h;

[0030] (3) Spread anthracite coal powder with a thickness of 10mm on the kiln car, place the bricks in step (...

Embodiment 2

[0035] A method for separating and reducing iron powder from refractory ore, compound ore and iron-containing waste, the steps are as follows:

[0036] (1) select TFe:45.46% Hunan oolitic hematite, be ground into about 80 purpose mineral powders, add reducing agent, auxiliary agent and glass water, the weight ratio of described mineral powder, reducing agent, auxiliary agent and glass water 66:20:13:1.0, then add waste refractory brick particles with a particle size of 3-6mm and 6% of the mass of mineral powder, and scrap steel chips with a length of 3-10mm and 4.5% of the mass of mineral powder, and mix evenly;

[0037] (2) Spray 5.0% water of mineral powder mass in the mixed mineral powder of step (1), make mineral powder into bricks of 230×115×65mm, spray a layer of 1.5mm on the surface of mineral powder bricks after drying Thick refractory coating layer, dry in a drying kiln at 180°C for 4.0h;

[0038] (3) Spread anthracite coal powder with a thickness of 10mm on the kiln...

Embodiment 3

[0044] A method for separating and reducing iron powder from refractory ore, compound ore and iron-containing waste, the steps are as follows:

[0045] (1) select TFe:40.26% Linjiang antelope iron ore, grind into 0~80 purpose ore powder, add reductant, auxiliary agent and lime powder, the weight of described ore powder, reductant, auxiliary agent and lime powder The ratio is 64:22:12.5:1.5, then add quartz sand with a particle size of 3-6mm, 4% of the mineral powder mass, and scrap steel scraps with a length of 3-10mm and 3.5% of the mineral powder weight, and mix evenly;

[0046] (2) Spray 5.0% water of mineral powder mass in the mixed mineral powder of step (1), make mineral powder into bricks of 230×115×65mm, spray a layer of 1.5mm on the surface of mineral powder bricks after drying Thick refractory coating layer, dry in a drying kiln at 105°C for 4.0h;

[0047] (3) Spread 10mm of anthracite coal powder on the kiln car, place the bricks in step (2) evenly on the kiln car ...

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Abstract

The invention belongs to the technical field of metallurgy, in particular to a method for separating and reducing iron powder from refractory mineral, complex ore and iron-containing waste materials. According to the method, the phase structure is converted into the easily-selected phase structure while the refractory mineral or the complex ore or the iron-containing waste materials are reduced and converted into metal iron; through simple magnetic separating, metal iron powder products high in recovery rate are obtained, considerable economic benefits are obtained, emission of a large amount of waste gas is reduced, and non-coking steelmaking is achieved; and meanwhile, the development of short-process steelmaking is promoted. By means of the method, capacity of a single production line is high, the production line can be in a concentric double-square shape, and the single production line can process 800,000 or more tons of various types of iron ore.

Description

technical field [0001] The invention belongs to the technical field of metallurgy, and in particular relates to a method for separating and reducing iron powder from refractory ore, composite ore and iron-containing waste. Background technique [0002] my country is the world's largest steel producer. In 2014, the steel output exceeded 1.126 billion tons (including 820 million tons of crude steel), and the annual demand for scrap steel was more than 2,900 tons (including DRI), while the annual output of reduced iron (DRI) in my country was only Less than 600,000 tons. [0003] my country is a country rich in low-poor and difficult-to-select iron ore resources. Low-poor and dull iron ore resources account for more than 97% of iron ore resources, which cannot be comprehensively utilized at present. Therefore, my country's dependence on rich ore imports is 55%. In addition, there are hundreds of millions of tons of sulfuric acid slag, copper slag, dust removal ash, alumina red ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B1/242C22B1/248C22B1/16B03C1/02
CPCY02P10/20
Inventor 唐竹胜唐佳
Owner 唐竹胜
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