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A method for removing arsenic from high-arsenic materials to recover valuable metals therein

A valuable metal and arsenic removal technology is applied in the field of removing arsenic from high-arsenic materials to recover valuable metals. It can solve the problems of low separation rate of valuable metals, diameter shrinkage, and difficult operation, and achieve reliable process methods, High arsenic removal productivity and effect of improving arsenic removal rate

Active Publication Date: 2017-07-21
LEIYANG YANXIN NON FERROUS METALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method has two major disadvantages: First, when the high-arsenic material is at a lower temperature, such as 300-400°C, it will melt and stick to the inner wall of the rotary kiln, resulting in "ringing" and "diameter shrinkage". Cause operation difficulty, reason is that the fusing point of arsenic trioxide is 315 ℃, when its content in the material exceeds 15-18%, will produce melting sticky phenomenon; In the high-arsenic dust, the arsenic content is generally between 60-70%, and the total amount of antimony, lead, tin, etc. is often as high as 10-20%, because when the temperature in the rotary kiln reaches 500°C, it has exceeded The boiling point of arsenic trioxide is 465°C. When the arsenic is partially boiled and volatilized, other elements, especially antimony, will volatilize in large quantities.

Method used

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  • A method for removing arsenic from high-arsenic materials to recover valuable metals therein

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Experimental program
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Effect test

Embodiment 1

[0015] Embodiment one: utilize horse boiling furnace to implement

[0016] 1) Take 500g of high-arsenic dust, the composition of which is pb10%, sb25%, Bi1%, Sn0.5%, As 2 o 3 35%, H 2 03%; 2) Spray 70g of water in the material tray with high arsenic smoke and granulate with artificial shaking; 3) Select 100g of high arsenic smoke and dust pellets with a particle diameter of 3-6mm and add them to a horse boiling furnace, adjust the furnace temperature to 150°C, and bake Dry for 20 minutes to obtain high-arsenic soot dry material 100-14.9=85.1g; 4) Increase the temperature of the horse boiler to 280°C for 120 minutes until no smoke is seen; 5) Sampling and determination of residual arsenic in the high-arsenic soot pellets After dropping to 15-20%, adjust the temperature of the boiling furnace to 320°C, and wait for no smoke after 25 minutes; 6) adjust the temperature of the boiling furnace to 380°C, and wait for no smoke after 25 minutes; 7) adjust the temperature of the boili...

Embodiment 2

[0017] Embodiment two: Utilize hot blast shaft furnace to implement

[0018] 1) Take 10kg of high-arsenic dust, the composition of the high-arsenic dust: Pb5%, Sb28%, Sn0.8%, As 2 o 3 40%, H 2 O2%, 2) Spray 1.4kg of water in the material tray with high arsenic smoke and granulate with artificial shaking; 3) Select 4 kg of high arsenic smoke and dust granules with a particle diameter of 3-6mm and pack them into a grid sieve with a diameter of Φ100mm at the bottom In the heat-insulating iron pipe used for leak-proofing, the height of the material column is H = 283mm, and the bulk specific gravity of the pellets is 1.8; 4) The hot air with a temperature of 150°C and a flow rate of 500l / min is passed for 80 minutes to dry the water; 5) The Heat the hot air to 280°C, with an air volume of 500 l / min, for 120 minutes; 6) Sampling and measuring the amount of residual arsenic in the high-arsenic soot pellets drops to 15-20%, then raise the temperature of the hot air to 310°C, and mai...

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Abstract

The invention discloses a sublimation arsenic-removal method for high-arsenic materials. The sublimation arsenic-removal method includes the steps that firstly, high-arsenic flue dust is pelletized, and high-arsenic flue dust particles of which the particle size is three to six millimeters are selected; then the temperature is controlled to be below 150 DEG C, and moisture in the obtained high-arsenic flue dust particles is evaporated; the high-arsenic flue dust particles in which the moisture is already evaporated are heated to 200 to 280 DEG C for sublimation arsenic removal; and finally, the temperature is gradually increased in different temperature segments and time segments till reaching 500 DEG C, and the sublimation arsenic removal process is finished. By means of the sublimation arsenic-removal method for arsenic removal treatment of the high-arsenic flue dust, the separation rate of arsenic and other valuable metal elements is quite high, and the arsenic-removal production rate is high. Moreover, the phenomena of fusion and sticky paste are avoided, and the whole process is smooth. Therefore, the sublimation arsenic-removal method for the high-arsenic materials is a brand-new, efficient and reliable technique.

Description

technical field [0001] The invention relates to a method for removing arsenic from high-arsenic materials to recover valuable metals therein. Background technique [0002] In the non-ferrous metal smelting industry, arsenic contained in high-arsenic materials (high-arsenic copper-nickel alloy, high-arsenic lead mud, high-arsenic nickel ore, high-arsenic gold ore, etc.) is often combined with other valuable metal elements, such as lead, Antimony, bismuth, tin, etc. volatilize together into the flue gas dust. Usually, the total amount of lead, antimony, bismuth, and tin in this flue gas dust reaches 5-50%, and the arsenic content ranges from 3-60%. It is a high-value secondary Secondary resources. [0003] The traditional fire recovery and separation process generally uses the rotary kiln method, which uses the low boiling point of arsenic trioxide in the material to separate it from other metal oxides by volatilization. This method has two major disadvantages: First, when t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B7/02
CPCC22B7/005C22B7/02Y02P10/20
Inventor 梁金凤石仁章石宏娇石俊阳王小明汪琴梁伟梁斌
Owner LEIYANG YANXIN NON FERROUS METALS
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