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A method for deep dearsenization of arsenic-containing material by roasting

A material and roasting technology, which is applied to the field of deep arsenic removal by roasting arsenic-containing materials, can solve the problems of poor calcine quality and poor arsenic removal effect, and achieve the effects of good calcine quality, high removal rate and simple process.

Active Publication Date: 2018-06-29
BEIJING GENERAL RES INST OF MINING & METALLURGY
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to provide a deep roasting arsenic removal method for arsenic-containing materials in view of the deficiencies in the existing arsenic-containing material dearsenic technology, especially the problems of poor arsenic removal effect and poor calcined sand quality existing in the traditional roasting arsenic removal technology

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Finely grind the molybdenum-nickel ore containing 0.69% arsenic to ≤74μm, accounting for about 80%, mix it with calcium chloride according to 10% of the mass of the molybdenum-nickel ore, and then add a small amount of water to mix well and granulate to obtain pellets. Put it into a rotary kiln, control the volume percentage concentration of oxygen in the flue gas in the kiln to be 2.5% in a weak oxidizing atmosphere, and roast at a temperature of 1000 ° C for 2 hours to obtain a deeply de-arsenic calcined sand with arsenic content of 0.0075%.

Embodiment 2

[0023] Dissolve 5g of calcium chloride in 10ml of water, then mix and granulate with 100g of arsenic-containing gold concentrate powder containing 0.69% arsenic to obtain pellets, put the pellets into a rotary kiln, and control the volume percentage of oxygen in the flue gas in the kiln In a weak oxidizing atmosphere with a concentration of 2.5%, it is roasted at a temperature of 1000° C. for 2 hours to obtain deeply dearsenic calcined sand containing 0.05% arsenic.

Embodiment 3

[0025] Dissolve 5g of calcium chloride in 10ml of water, then mix with 100g of molybdenum powder containing 0.69% arsenic and granulate to obtain pellets, dry the pellets and put them into a rotary kiln to control the volume of oxygen in the flue gas in the kiln Under a weak oxidation atmosphere with a percentage concentration of 2.5%, it is roasted at a temperature of 1000° C. for 2 hours to obtain deeply dearsenic calcined sand containing 0.05% arsenic.

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Abstract

The invention discloses a method for deep roasting arsenic removal of an arsenic-containing material, and belongs to the technical field of non-ferrous metallurgy. The fine grinded arsenic-containing material is evenly mixed with a proper quantity of chlorinating agents and water, pelletizing is carried out to obtain pellets, then the pellets are fed into a roasting furnace after being dried, roasting is carried out by controlling the atmosphere in the furnace, and roasted ore with the arsenic content being lower than or equal to 0.1% is obtained. According to the method, chloride such as calcium chloride, sodium chloride and magnesium chloride serves as roasting arsenic removal flux, roasting is carried out in a weak oxidation atmosphere or a weak reduction atmosphere, arsenic is converted into the form of arsenic chloride easy to volatilize so as to be removed from the arsenic -containing material, the process is simple, the arsenic removal rate is high, and the quality of the roasted ore is good.

Description

technical field [0001] The invention belongs to the technical field of nonferrous metal metallurgy, and relates to a method for deeply dearsenicizing arsenic-containing materials by roasting. Background technique [0002] Arsenic is a common harmful element in metal ores. Because it is dispersed in the gas phase, tailings, intermediate products, and even products during the metal ore smelting process, it not only pollutes the environment, but also leads to a decrease in product quality or an increase in refining costs. Therefore, how to efficiently Arsenic removal has always been a technical difficulty in the processing of such materials. Industrial arsenic removal methods are divided into two categories: wet method and fire method, and fire method is the main process at present. [0003] Dearsenization by fire method is divided into roasting, arsenic slagging, vacuum distillation, etc. Among them, roasting is the most used method, mainly through oxidative roasting or reduc...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B1/08C22B15/00C22B34/34C22B23/00C22B11/00C22B13/00
CPCC22B1/08C22B11/00C22B13/00C22B15/0002C22B23/005C22B34/34
Inventor 蒋训雄范艳青靳冉公冯林永汪胜东蒋伟张登高刘巍赵峰
Owner BEIJING GENERAL RES INST OF MINING & METALLURGY
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