Method for removing arsenic from white smoke

A technology for white smoke and arsenic removal, applied in the direction of improving process efficiency, can solve the problem of low direct yield, etc., and achieve the effects of short process flow, high calcining rate, and complete removal of arsenic.

Inactive Publication Date: 2014-07-30
云南锡业研究院有限公司研究设计院 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The method of pre-removing arsenic is: adding a reducing agent at a certain temperature to volatilize and remove arsenic, but the arsenic in the white smoke is mainly arsenic oxide (mainly diarsenic trioxide), and the temperature required to completely volatilize diarsenic trioxide is higher (800 Above), the direct recovery rate of other valuable metals is not high at this temperature (lead, zinc, indium, silver, etc. will all volatilize into the smoke at this temperature)

Method used

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  • Method for removing arsenic from white smoke

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0011] Example 1: The raw material composition of white soot is: arsenic: 15.32%, zinc: 12.52%, lead: 17.46%, bismuth: 4.36%, indium: 0.125%, copper: 3.12%, silver: 137.3g / t.

[0012] Mix white soot: industrial sulfur at a ratio of 1:0.3 (weight ratio), that is, add 250 grams of white soot (75 grams of industrial sulfur) into the muffle furnace, react at 350 ° C for 2 hours, and obtain the calcined sand. Volatilize and remove arsenic at 610°C±10°C for 2 hours.

[0013] The obtained calcine contains: arsenic: 2.0%, zinc: 17.9%, lead: 23.41%, bismuth: 6.5%, indium: 0.174%, copper: 4.87%, silver: 212g / t.

[0014] The removal rate of arsenic in this test is 91.39%, and the rates of valuable metals into the calcine are: lead: 90%, zinc: 91.98%, bismuth: 95.92%, indium: 95.95%, copper: 95.49%, silver: 99.56% %.

Embodiment 2

[0015] Example 2: The raw material composition of white soot is: arsenic: 13.5%, zinc: 12.15%, lead: 19.38%, bismuth: 4.12%, indium: 0.125%, copper: 3.68%, silver: 138.4g / t.

[0016] Mix white soot: industrial sulfur at a ratio of 1:0.4 (weight ratio), add 250 grams of white soot (100 grams of industrial sulfur) into the muffle furnace, and react at 335°C for 3 hours. Volatilize and remove arsenic at ±10°C for 2.5 hours.

[0017] The obtained calcine contains: arsenic: 0.67%, zinc: 18.39%, lead: 24.84%, bismuth: 6.66%, indium: 0.181%, copper: 4.82%, silver: 229.4g / t.

[0018] The removal rate of arsenic in this test is 97.39%, and the rates of valuable metals entering the calcine are: lead: 85%, zinc: 95.0%, bismuth: 91.07%, indium: 88.71%, copper: 92.09%, silver: 95.70% %.

Embodiment 3

[0019] Example 3: The raw material composition of white soot is: arsenic: 16.48%, zinc: 12.85%, lead: 16.42%, bismuth: 4.17%, indium: 0.132%, copper: 3.24%, silver: 136.8g / t.

[0020] Mix white soot: industrial sulfur at 1:0.5 (weight ratio), that is, add 250 grams of white soot (125 grams of industrial sulfur) into the muffle furnace, and react at 365 ° C for 1.5 hours to obtain calcined sand. Volatilize and remove arsenic at 630°C±10°C for 2 hours.

[0021] The obtained calcine contains: arsenic: 1.2%, zinc: 18.34%, lead: 24.51%, bismuth: 6.41%, indium: 0.176%, copper: 4.74%, silver: 208g / t.

[0022] The removal rate of arsenic in this test is 96.42%, and the rates of valuable metals entering the calcine are: lead: 87%, zinc: 92.43%, bismuth: 95.64%, indium: 96.17%, copper: 95.22%, silver: 99.38 %.

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Abstract

The invention belongs to the technical field of thermometallurgy, and particularly relates to a method for removing arsenic from white smoke generated in copper smelting. The method comprises the steps of mixing the white smoke generated in copper smelting with sulfur for industrial use by a weight ratio of 1:(0.3-0.5); roasting at 330-370DEG C firstly; then volatilizing the obtained roasted product at 600-660DEG C, so as to lower the content of arsenic in the final roasted product to be 0.6-2%. The method has simple conditions in removing the arsenic, has a short technological process, can thoroughly remove the arsenic in the white smoke, and has high roasting rate of valuable metals; and the content of arsenic and iron cake can be greatly lowered after the white smoke with the arsenic removed is leached through a wet process.

Description

technical field [0001] The invention belongs to the technical field of pyrometallurgy, and in particular relates to a method for removing arsenic from white smoke in copper smelting. Background technique [0002] White fume is the general term for the dust produced in the copper smelting process. At present, the main method to deal with white fume is wet leaching. The general flow of the process is: leaching white soot with sulfuric acid, immersing valuable metals (copper, zinc) in the solution, most of other metals enter the leaching residue, and most of the arsenic enters the leaching solution during leaching. The leaching solution is flocculated with iron ions to remove arsenic, iron powder is added to replace it to produce sponge copper, and zinc is made into basic zinc carbonate by neutralization and precipitation. However, a large amount of harmful slag (arsenic-iron slag) is produced during the process of removing arsenic by precipitation, and arsenic hydrogen gas wi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B7/02C22B30/04
CPCY02P10/20
Inventor 李学鹏卢兴伟尹久发马宇陈学元朱跃林
Owner 云南锡业研究院有限公司研究设计院
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