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Method for removing arsenic impurities from tin

A technology of impurities and impurity elements, applied in the field of non-ferrous metal pyrometallurgy, can solve the problems of reducing the economic benefits of enterprises, high labor intensity of workers, affecting the direct yield of tin, etc. Highly adaptable effect

Inactive Publication Date: 2011-11-23
KUNMING UNIV OF SCI & TECH +1
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method requires high-temperature operation, a large amount of smoke and slag are produced during the treatment process, the labor intensity of the workers is high, and the working environment is harsh; moreover, aluminum slag containing AlAs is produced in the process of adding aluminum and removing arsenic, and AlAs encounters water, steam or humidity Air, easy to produce highly toxic AsH 3 gas, which poses a huge safety hazard to the environment
In addition, the centrifugal slag, smelting slag, carbon slag, and aluminum slag produced in the arsenic removal process will entrain a large amount of metallic tin, which directly affects the direct recovery rate of tin and reduces the economic benefits of the enterprise.

Method used

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  • Method for removing arsenic impurities from tin

Examples

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Effect test

Embodiment 1

[0012] Embodiment 1: see figure 1 , put 10t crude tin raw material (Sn 81.54%; Pb 9.14%; Sb0.094%; Bi 0.184%; As3.30%) into the vacuum furnace, control the pressure in the vacuum furnace in the range of 0.5~6Pa, 1500℃, Vacuum volatilization for 1.5 hours, the impurity element arsenic volatilizes from the tin alloy melt, volatilizes into the condenser in a gaseous state, condenses to obtain crude arsenic with a content of 98%, and recovers, so that arsenic and tin are separated. The removal rate of arsenic is 95%.

Embodiment 2

[0013] Example 2: see figure 1 , put 10t crude tin raw material (Sn 86.88%; Pb 6.16%; Sb6.77%; Bi 0.23%; As 1.27%) into the vacuum furnace, control the pressure in the furnace to 45~50Pa, temperature 1300℃, and carry out continuous vacuum Volatilize for 1 hour to volatilize the impurity element arsenic from the tin alloy melt, volatilize in a gaseous state into the condenser, condense to obtain crude arsenic with a content of 99%, and recover it to separate arsenic from tin. A total of 116.7kg of crude arsenic was collected, and the removal rate of arsenic was 91%.

Embodiment 3

[0014] Embodiment 3: see figure 1 , 20t crude tin raw material (Sn84.68%; Pb 7.37%; Sb3.93%; Bi 2.61%; As 0.51%) was sent into the vacuum furnace, and the pressure in the furnace was 20~24Pa, 1200℃, for continuous vacuum Volatilize for 2 hours to volatilize the impurity element arsenic from the tin alloy melt and volatilize into the condenser in a gaseous state, condense to obtain crude arsenic with a content of 96%, and recover it to separate arsenic from tin. A total of 95.6 kg of crude arsenic was collected, and the removal rate of arsenic was 90%.

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Abstract

The invention relates to a method for removing arsenic impurities from tin. The method comprises the following steps of: adding an arsenic-containing tin alloy into a vacuum furnace, wherein arsenic elements in the tin are volatilized under the conditions that pressure in the furnace is in the range of 0.1-50Pa, the temperature in the furnace is between 1000 DEG C and 1500 DEG C, and the volatilization time of the arsenic-containing tin alloy is more than 0.25h; condensing the arsenic elements to obtain a metal arsenic; and separating the arsenic from the tin to obtain crude arsenic containing more than 90% of arsenic, wherein the removal rate of arsenic is greater than 90%. The invention provides a novel process for removing the arsenic from tin; the whole process is safe and controllable; and the method has the advantages of convenience for operation, high recovery rate of tin and arsenic, no need of adding chemical reagents and no pollution on the environment.

Description

technical field [0001] The invention provides a method for treating arsenic-containing tin alloy by vacuum volatilization so as to realize high-efficiency separation of tin and arsenic, and belongs to the technical field of nonferrous metal pyrometallurgy. technical background [0002] The crude tin produced by reduction smelting of tin ore contains various impurities, and even the tin produced from tin-rich concentrate usually has a purity that cannot meet the requirements of users. Arsenic is a common toxic impurity in crude tin. The content of arsenic will directly affect the quality, performance and use of tin products. For example, tin foil for food packaging and tin for tin-plated sheets are required to contain less than 0.015% arsenic. Arsenic can also cause the appearance and plasticity of tin to deteriorate, and increase the viscosity of tin. The hardness of tin with arsenic content of 0.055% will increase to Brinell hardness 8.7, making the section of tin granula...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B25/08C22B30/04C22B5/16
Inventor 杨斌戴卫平刘大春李一夫蒋文龙徐宝强速斌曹劲松戴永年邓勇熊恒王飞
Owner KUNMING UNIV OF SCI & TECH
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