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Method for comprehensive recovery of valuable metals from tin anode mud

A technology for tin anode slime and valuable metals, applied in the field of hydrometallurgy, can solve the problems of low removal rate of antimony, unrecoverable, short processing flow, etc., achieving good comprehensive recovery effect and reducing the degree of environmental pollution Effect

Inactive Publication Date: 2012-11-21
云南锡业研究院有限公司研究设计院
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The inventor once adopted hydrochloric acid leaching to the tin anode slime containing 0.2% silver, and as a result, the silver in the anode slime all entered the leaching solution, which could not be recovered and lost
[0005] The process of pyroprocessing tin anode slime has the advantages of large processing capacity and short process, but the removal rate of antimony is low, and the effect of comprehensive recycling is not good

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0019] Example 1: The tin anode slime is crushed to a particle size of over 20 meshes, tin anode slime (Sn 37.60%, Sb 13.57%, Ag 0.27529%, Bi 0.72%, Cu 1.85%, Pb 18.12%, As 3.15%) mixed with sodium hydroxide, Water is mixed according to the mass ratio of 1:1:5, the pH value of the mixed material is greater than 12, put into the autoclave, the stirring speed is adjusted to 600rpm, the temperature is raised to 160°C under airtight conditions, and the temperature is stirred for 20min. Cooling, discharging, filtering. The tin leaching rate is 92%, and the antimony leaching rate is 88%. Add excess metal tin to the filtrate and heat it to above 80°C to purify and remove impurities. After purification, the liquid was heated to 70°C for electrowinning, cell voltage 2.8V, current efficiency 81%, cathode tin test results: Sn 99.04%, Sb 0.134%, As 0.11%, Bi 0.01%, Cu 0.063%, Pb 0.098%, Fe 0.022%, S 0.001%. The test results of the leaching slag after drying: Ag 1.16%, Bi 3.12, Cu 7.91,...

example 2

[0020]Example 2: The tin anode slime is crushed to a particle size of over 20 meshes, tin anode slime (Sn 39.00%, Sb 22.12%, Ag 0.47842%, Bi 2.64%, Cu 3.82%, Pb 2.96%, As 2.10%) and sodium hydroxide, Potassium sulfide and water are mixed according to the mass ratio of 1:1:0.02:5. The pH value of the mixed material liquid is greater than 12. Put it into the autoclave, adjust the stirring speed to 500rpm, raise the temperature to 210°C under airtight conditions, and pass oxygen to the autoclave. The pressure was 4MPa, and the mixture was stirred at constant temperature for 10 minutes. Cooling, discharging, filtering. The tin leaching rate is 96%. Add excess metal tin to the filtrate, heat it to 95°C, and purify and remove impurities. After purification, the liquid was heated to 80°C for electrowinning, the cell voltage was 2.6V, and the current efficiency was 89%. The cathode tin test results: Sn 99.95%, Sb 0.0086%, As 0.0010%, Bi 0.0011%, Cu 0.0035%, Pb 0.0044%, Fe 0.0052%, ...

example 3

[0021] Example 3: The tin anode slime is crushed to a particle size of over 20 meshes, tin anode slime (Sn 41.64%, Sb 23.15%, Ag 0.15637%, Bi 1.94%, Cu 4.02%, Pb 1.53%, As 2.61%) and potassium hydroxide, Sodium sulfide and water are mixed according to the mass ratio of 1:0.1:1:6, the pH value of the mixed material is greater than 12, put into the autoclave, the stirring speed is adjusted to 400rpm, the temperature is raised to 140°C under airtight conditions, and the temperature is stirred for 30min. Cooling, discharging, filtering. The tin leaching rate is 91%, and the antimony leaching rate is 86%. The filtrate is directly electrowinning, the solution temperature is 40°C, the cell voltage is 2.5V, and the current efficiency is 76%. The test results of the cathode tin-antimony alloy: Sn 8.15%, Sb 90.36%, As 0.69%, Bi 0.012%, Cu 0.0005%, Pb 0.0003%, Fe 0.036%. The test results after drying the leaching slag: Ag 0.81180%, Bi 10.12, Cu 19.28, Pb10.10. Oxidative roasting at 700...

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PUM

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Abstract

Belonging to the technical field of wet metallurgy, the invention especially relates to a method for comprehensive recovery of valuable metals from tin anode mud. The method comprises the following technical key points of: mixing the tin anode mud with one or more of an alkali metal hydroxide aqueous solution and an alkali metal sulfide aqueous solution, keeping the pH value of the mixed feed solution greater than 12, placing the feed solution into a sealed reactor, conducting heating to a temperature of 100-300DEG C, carrying out stirring reaction, then performing filtration, recovering valuable metals, mainly tin, from the filtrate, and recovering various valuable metals from the filter residue by means of oxidizing roasting transformation, copper leaching by sulfuric acid, silver leaching by nitric acid, bismuth leaching by hydrochloric acid. The invention is particularly suitable for treatment of tin anode mud with high antimony and low silver, and can achieve a good comprehensive recovery effect for various valuable metals. The leaching rate of tin is greater than 90%, the removal rate of antimony is greater than 85%, and silver, bismuth, copper, as well as lead are enriched over 4 times. And the method generates a relative small amount of ''three wastes'', thus being in favor of environmental protection.

Description

technical field [0001] The invention belongs to the technical field of hydrometallurgy, in particular to a method for comprehensively recovering valuable metals from tin anode slime. Background technique [0002] The tin anode slime produced by crude tin or crude solder electrolytic refining has a high content of valuable metals. Generally, the mass percentage of metal contained in tin anode slime is as high as 70%, so it has great recycling value; at the same time, tin There are many kinds of metals contained in the anode slime, and almost all the metal elements that enter the tin smelting process can be found in the tin anode slime. The contents of Sn, Sb, As, Bi, Cu, and Pb are generally above 1%. Certain Ag, In, Au, etc., so the recovery process is long and difficult. [0003] Due to the high content and variety of valuable metals in tin anode slime, comprehensive utilization of technical solutions is generally adopted to treat tin anode slime. When the silver content ...

Claims

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Application Information

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IPC IPC(8): C22B7/00C22B25/06C22B15/00C22B11/00C22B30/06
CPCY02P10/20
Inventor 陈绍春陈绍雄苏瑞春尹久发杨铣马宇王勇
Owner 云南锡业研究院有限公司研究设计院
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