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Method for treating arsenic-containing material by using electric arc furnace

An electric arc furnace and electric arc furnace smelting technology, which is applied in the field of comprehensive recovery of arsenic and valuable metals, can solve the problems of high environmental protection treatment costs, poor working environment, and high labor intensity, and achieve strong equipment adaptability, low noise pollution, and occupation small area effect

Inactive Publication Date: 2010-12-22
YUNNAN TIN GROUP HLDG
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Problems solved by technology

The arsenic trioxide product prepared by the wet process is of good quality, but the treatment process is long and the arsenic removal rate is low, especially the crystallization mother liquor is likely to cause secondary water pollution, and the cost of environmental protection treatment is high
Existing fire treatment processes, such as reverberatory furnace volatilization, flat kiln volatilization, open hearth volatilization, etc., have the characteristics of short process and high efficiency. As long as the volatilization temperature range is well controlled, it is easy to volatilize arsenic trioxide, but rotary kiln is required. The equipment further recovers the valuable metals in the volatile residue, which is labor-intensive and the working environment is poor

Method used

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  • Method for treating arsenic-containing material by using electric arc furnace

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Comparison scheme
Effect test

Embodiment 1

[0016] Mix 1000Kg of tin-arsenic ash (composition as shown in Table 1) with 1% coke powder with a particle size of 0.1-5.0mm, and 3% quartz sand and calcium oxide with a particle size of 1.0-40mm, and use a screw feeder to pass the material through the electrode The hollow hole is added to a 1250KVA DC electric arc furnace with a negative pressure of -20±5Pa, the temperature of the furnace top is controlled at 800±50°C, and the temperature of the molten pool is kept at 1100±50°C to volatilize the arsenic trioxide. 3 / h flow rate of air, cooling and multi-stage sedimentation, the sedimentation temperature is 500 ~ 80 ℃, and 710Kg of the product is collected. Wherein, the purity in No. 2, No. 3, and No. 4 settling chambers reaches more than 99%, and the productive rate is 85% (the settling chambers are No. 1, No. 2, No. 3, and No. 4 from the furnace to the bag dust collector), and No. 1 settling chambers The purity of arsenic trioxide in the chamber is over 95%, and the purity o...

Embodiment 2

[0020] A 600KVA AC electric arc furnace is used to treat arsenic-containing materials produced by bag dust collection in copper smelting furnaces. The main components are: As57.98%, Cu0.20%, Pb4.47%.

[0021] Mix 500Kg of the above-mentioned arsenic-containing material into 2% coke with a particle size of 0.1-5.0mm, 3% quartz sand with a particle size of 1.0-40mm and calcium oxide, and then use a screw feeder to feed the material into the negative pressure from the furnace side feed port. In the electric arc furnace at -30±5Pa, the furnace top temperature is controlled at 800±50°C, the temperature of the molten pool is kept at 1000±50°C, and the arsenic trioxide obtained by volatilization directly enters the carbon thermal reduction furnace for reduction, and the reduction temperature is 800±20 °C, the reduced metal arsenic vapor is condensed at 350 °C to room temperature, and 99% of the metal arsenic is collected, and the total yield of arsenic is >98%. The residue is added w...

Embodiment 3

[0023] Secondary zinc oxide fumes (smoke produced by fuming furnaces to process lead-zinc closed blast furnace slag) mainly consist of Zn50%, Pb4%, As25%.

[0024] Add 1000kg of the above-mentioned ingredients to the coke with a particle size of 0.1-5.0mm and 5% quartz sand with a particle size of 1.0-40mm, calcium oxide and other additives, and then add the materials to the furnace top. In the 1250KVA DC electric arc furnace, the furnace top temperature is controlled at 600±50°C, the melting temperature is 900±50°C for volatilization of arsenic trioxide, and the volatilized arsenic trioxide vapor is injected into 10Nm 3 / h flow rate of air, cooling and multi-stage sedimentation, the sedimentation temperature is 500 ~ 80 ℃, 291 kg of diarsenic trioxide products of different qualities are collected, and the yield of arsenic trioxide with quality > 96% is > 92%. The primary volatilization rate of arsenic is more than 95%, and the arsenic content in the residue is less than 3%.

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Abstract

The invention relates to a method for treating an arsenic-containing material and comprehensively recovering arsenic and other valuable metals by using an electric arc furnace. The method comprises the following steps of: adding a material containing arsenic trioxide into the electric arc furnace; adding a certain proportion of reducing agents and additives according to the components of the arsenic-containing material; keeping a certain pressure and temperature in the furnace to ensure that the arsenic trioxide in the material is fully volatilized; allowing the volatilized arsenic trioxide steam to pass through two paths so as to obtain high-quality arsenic trioxide and metallic arsenic respectively; and adding slag forming constituents and the reducing agents into volatilized residues for smelting to further recover the valuable metals in the residues. The method of the invention can realize the volatilization of the arsenic trioxide and the recovery and smelting of other valuable metals only by the electric arc furnace and has the advantages of strong adaptability of equipment, short flow, simple operation, good comprehensive recovery and good working environment.

Description

technical field [0001] The invention relates to a method for treating arsenic-containing materials, in particular to a method for comprehensively recovering arsenic and valuable metals by using an electric arc furnace to treat arsenic-containing materials. Background technique [0002] Arsenic element is commonly found in non-ferrous metal ore bodies. With the development of mineral mining, mineral processing, metallurgy and deep processing of various metal products, arsenic mainly exists in the form of arsenic trioxide, arsenic pentoxide, metallic arsenic, and arsenic compounds in smoke and dust. , waste water, waste residue, waste gas and products. The amount of arsenic brought into my country's non-ferrous metal industry with concentrates is more than 20,000 tons every year, resulting in the accumulation of a large number of difficult-to-handle materials containing both ferrous metals and arsenic. Arsenic is toxic, especially the fluidity of soluble arsenic compounds in ...

Claims

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Application Information

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IPC IPC(8): C22B30/04C22B7/00
CPCY02P10/20
Inventor 王炜董瀚刘新阳黄迎红温宗汉朱华明
Owner YUNNAN TIN GROUP HLDG
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