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Method of arsenic removal in direct reduction process

A direct, arsenic-removing technology, applied in the direction of improving process efficiency, etc.

Active Publication Date: 2014-03-05
CENT IRON & STEEL RES INST +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The research on the removal of arsenic from arsenic-containing materials mainly focuses on the removal of arsenic during roasting and sintering and the wet method. However, in the direct reduction process, there is no effective method for removing arsenic in this field.

Method used

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  • Method of arsenic removal in direct reduction process

Examples

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Effect test

example 1

[0032] The arsenic-containing material is high-arsenic iron ore, the weight percentage of TFe is 46.70%, and the weight percentage of As is 0.52%, wherein As is FeAsO 4 form exists. Grind it to make powder, select 100g of high-arsenic iron ore powder below 100 mesh, mix it with 20g of coal powder, add 8% binder to make pellets, and the diameter of the carbon-containing pellets is 1cm-2cm. Place in an oven at 200°C and dry for 4 hours to ensure most of the free water is removed. The dry carbon-containing pellets can be put into the reduction furnace and the furnace temperature rises to 850°C, or they can be put in after the reduction furnace reaches the set temperature of 850°C, and N 2 - CO gas controls the atmosphere in the furnace as a reducing atmosphere, and opens the tail gas treatment device to treat the tail gas discharged from the reduction furnace. After reduction at 850°C for 2 hours, the metallized pellets after direct reduction were taken out, cooled with water t...

example 2

[0043] The arsenic-containing material is low-arsenic iron ore, the weight percentage of TFe is 61.78%, and the weight percentage of As is 0.066%, wherein As exists in the form of FeAsS. Grind it to make powder, select 100g of low-arsenic iron ore powder below 100 mesh, add 20g of coke powder and mix evenly, add 8% binder to make pellets, the diameter of carbon-containing pellets is 1cm-2cm, and the prepared pellets Place in an oven at 200°C and dry for 4 hours to ensure most of the free water is removed. The dry carbon-containing pellets can be put into the reduction furnace and the furnace temperature rises to 1000°C, or they can be put in after the reduction furnace reaches the set temperature of 1000°C, and N 2 -O 2 The gas is to control the atmosphere in the furnace as an oxidizing atmosphere, and the tail gas treatment device is opened to process the tail gas discharged from the reduction furnace. After reduction at 1000°C for 3 hours, the metallized pellets after dire...

example 3

[0050] The arsenic-containing material is arsenic-containing copper slag, in which TFe is 36.10% by weight, Cu is 0.68% by weight, and As content is 0.14%, where Cu exists in the form of CuO, and Fe exists in the form of Fe 2 o 3 Exist in the form, As as As 2 o 5 form exists. Grind it, select 100g of arsenic-containing copper slag powder below 100 mesh, add 30g of petroleum coke, add 8% binder and mix well, and then make pellets. The diameter of the carbon-containing pellets is 1cm-2cm. In an oven at 200°C, dry for 4 hours to ensure that most of the free water is removed. The dry carbon-containing pellets can be put into the reduction furnace and the furnace temperature rises to 1250°C, or it can be put in after the reduction furnace reaches the set temperature of 1250°C, and N 2 - CO gas controls the atmosphere in the furnace as a reducing atmosphere, and opens the tail gas treatment device to treat the tail gas discharged from the reduction furnace. After reduction at 1...

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Abstract

The invention discloses a method of arsenic removal in a direct reduction process. The method comprises the following steps: grinding a material containing arsenic; adding a reducing agent and a binder into the material; evenly mixing and pelletizing; drying the prepared pellets and placing in a reduction furnace; and performing a direct reduction reaction by controlling a reaction temperature and a furnace inside atmosphere, thereby removing the arsenic and performing direct reduction on valuable metals at the same time. According to the method, the arsenic removal and the reduction treatment of the valuable metals are realized at the same time.

Description

technical field [0001] The invention relates to a method for removing arsenic in the direct reduction process, more specifically, relates to a method for removing arsenic in the direct reduction process and simultaneously directly reducing valuable metals. Background technique [0002] In iron and steel metallurgical production, arsenic is a common harmful residual element in steel, which mainly comes from iron ore, ferroalloy and steel scrap. Arsenic is easy to segregate at the grain boundary of steel, which will cause serious segregation of components and destroy the continuity of the metal matrix; it will cause defects such as "hot brittle" cracks on the surface of steel during hot processing; the elongation, reduction of area and Impact toughness is reduced and the weldability of the steel deteriorates. [0003] Arsenic is also an extremely harmful element in non-ferrous metallurgical production. Except for a few smelters that recover part of the arsenic in the form of ...

Claims

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Application Information

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IPC IPC(8): C22B5/10C22B30/04
CPCY02P10/20
Inventor 居殿春刘家琪卢军辉吴战芳
Owner CENT IRON & STEEL RES INST
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