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Dearsenization method for iron ore

An iron ore and arsenic removal technology, applied in the field of iron and steel smelting, can solve the problems of deep arsenic removal and environmental pollution, and achieve the effect of reducing impact and avoiding pollution

Pending Publication Date: 2018-04-13
JIANGSU PROVINCE METALLURGICAL DESIGN INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the existing ore dearsenic methods have the problems of environmental pollution and inability to deeply remove arsenic

Method used

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  • Dearsenization method for iron ore

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] 100 parts by weight of arsenic-containing ore powder, 5 parts by weight of coal powder, and 3 parts by weight of dolomite are mixed and pelletized, and the particle size of the pellets is 8mm. Put the dried green balls into the roasting furnace and heat to 800°C. By adjusting the air-fuel ratio, the atmosphere in the furnace is controlled to be a weak oxidizing atmosphere, in which CO 2 The / CO volume ratio is 1.67:1, and the temperature is maintained for 5 minutes. At this stage, arsenic in the form of iron sulfur arsenide can be effectively removed. Then heat the roasting furnace to 1200°C, then adjust the air-fuel ratio, and control the atmosphere in the furnace to be a reducing atmosphere, where CO / CO 2 The volume ratio is 1.9:1, and the temperature is maintained for 30 minutes. At this stage, the arsenic in the form of arsenate can be effectively removed, and the metallized pellets after arsenic removal can be obtained. The flue gas obtained from the reaction in t...

Embodiment 2

[0043] 100 parts by weight of arsenic-containing ore powder, 10 parts by weight of coal powder, and 3 parts by weight of dolomite are mixed and pelletized, and the particle size of the pellet is 12 mm. Put the dried green balls into the roasting furnace and heat it to 900°C. By adjusting the air-fuel ratio, the atmosphere in the furnace is controlled to be a weak oxidizing atmosphere, in which CO 2 The / CO volume ratio is 1.2:1, and the temperature is maintained for 10 minutes. At this stage, arsenic in the form of iron sulfur arsenide can be effectively removed. Then heat the roasting furnace to 1200°C, then adjust the air-fuel ratio, and control the atmosphere in the furnace to be a reducing atmosphere, where CO / CO 2 The volume ratio is 1.9:1, and the temperature is maintained for 25 minutes. At this stage, the arsenic in the form of arsenate can be effectively removed, and the metallized pellets after arsenic removal can be obtained. The flue gas obtained from the reaction...

Embodiment 3

[0046] 100 parts by weight of arsenic-containing ore powder, 15 parts by weight of coal powder, and 3 parts by weight of dolomite are mixed and pelletized, and the particle size of the pellets is 16 mm. Put the dried green balls into the roasting furnace and heat to 1000°C. By adjusting the air-fuel ratio, the atmosphere in the furnace is controlled to be a weak oxidizing atmosphere, in which CO 2 The / CO volume ratio is 0.85:1, and the temperature is maintained for 10 minutes. At this stage, arsenic in the form of iron sulfur arsenide can be effectively removed. Then heat the roasting furnace to 1300°C, then adjust the air-fuel ratio, and control the atmosphere in the furnace to be a reducing atmosphere, in which CO / CO 2 The volume ratio is 2.25:1, and the temperature is maintained for 20 minutes. At this stage, the arsenic in the form of arsenate can be effectively removed, and the metallized pellets after arsenic removal can be obtained. The flue gas obtained from the reac...

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Abstract

The invention discloses a dearsenization method for iron ore. The method mainly comprises the steps that ore powder, coal powder and an additive are mixed in proportion to be pelletized and dried anddried pellets are subjected to oxidizing roasting and then reducing roasting. Through the roasting mode of the combination of oxidizing and reducing, arsenic in the iron ore is removed so as to achieve the purpose of decreasing the content of arsenic in steel. According to the method, the dearsenization rate reaches 90% or over, and the ore which is high in arsenic content and thus cannot be utilized can be treated on a large scale.

Description

technical field [0001] The invention relates to the field of iron and steel smelting, in particular to a method for removing arsenic from iron ore. Background technique [0002] Although arsenic is a trace element in steel, it is generally a harmful impurity, and its harmfulness is similar to that of phosphorus. Like phosphorus, arsenic is prone to segregation at the interface of steel, resulting in the phenomenon of "temper embrittlement". Excessive arsenic content in steel will cause cracks on the hot-worked surface of the steel, increase the brittleness of the steel, reduce the impact value and plasticity of the steel, affect the performance of the steel, and reduce the quality of the steel. However, it is difficult to remove arsenic through hot metal pretreatment and steelmaking. Generally, arsenic removal is carried out by adding calcium-containing slag, silicon-calcium alloy, and rare earth alloy. Although this method can achieve a certain effect of arsenic removal, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B1/02C22B1/24
CPCC22B1/02C22B1/2406
Inventor 李永卿任中山徐刚闫方兴陈佩仙郑常乐曹志成吴道洪
Owner JIANGSU PROVINCE METALLURGICAL DESIGN INST
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