Method for processing high-tin anode slurry

A technology of tin anode slime and a treatment method, which is applied in the treatment field of high tin anode slime, can solve the problems of low tin recovery rate and complicated process, and achieve the effects of less precious metal loss, low cost and rational utilization.

Active Publication Date: 2014-09-10
SINOPEC SHANGHAI ENG +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The technical problem to be solved by the present invention is that the prior art has the problems of low tin recovery rate and complicated process, and provides a new treatment method for high-tin anode slime

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] To process high-tin anode slime, the steps are as follows:

[0022] Alkali roasting. Take the anode slime, in which the tin content is 20%, the precious metal (the sum of gold, silver and palladium content) is 1.5kg / ton, and 2kg of the anode slime is added with sodium hydroxide according to the tin measurement ratio of 1:1.5, then mixed evenly, and roasted in the heating furnace , the calcination temperature is 400°C, and the calcination time is 2 hours.

[0023] Hot water for immersion. After the roasting material is cooled, add hot water for water immersion, the water immersion temperature is 80°C, the solid-liquid ratio is 1:2, and the stirring time is 3 hours. Filter to obtain 3 L of alkali filtrate containing sodium stannate, the tin content is 65 g / l, and the filter residue is 1.1 kg.

[0024] Hydrochloric acid leaching. Add 1.1kg of water leaching residue to hydrochloric acid solution according to the solid-to-liquid ratio of 1:3, the concentration of hydroch...

Embodiment 2

[0027] To process high-tin anode slime, the steps are as follows:

[0028] Alkali roasting. Take the anode slime, the tin content of which is 20%, the precious metal (the sum of gold, silver and palladium content) 1.5kg / ton, add potassium hydroxide to 2kg of the anode slime according to the tin measurement ratio of 1:2, then mix evenly, and roast in the heating furnace , the calcination temperature is 450°C, and the calcination time is 3 hours.

[0029] Hot water for immersion. After the roasting material is cooled, add hot water for water immersion, the water immersion temperature is 80°C, the solid-liquid ratio is 1:2, and the stirring time is 2 hours. Filtrate to obtain 4 L of alkali filtrate containing sodium stannate, tin content 50 g / l, and filter residue 1.0 kg.

[0030] Hydrochloric acid leaching. Add 1.0 kg of water leaching residue to hydrochloric acid solution according to the solid-to-liquid ratio of 1:2.5, the concentration of hydrochloric acid is 5 mol / l, the...

Embodiment 3

[0033] To process high-tin anode slime, the steps are as follows:

[0034] Alkali roasting. Take the anode slime, in which the tin content is 20%, the precious metal (the sum of gold, silver and palladium content) is 1.5kg / ton, add sodium hydroxide to 2kg of the anode slime according to the tin measurement ratio of 1:1.8, then mix evenly, and roast in the heating furnace , the calcination temperature is 350°C, and the calcination time is 3 hours.

[0035] Hot water for immersion. After the roasting material is cooled, add hot water for water immersion, the water immersion temperature is 80°C, the solid-liquid ratio is 1:4, and the stirring time is 2 hours. Filtrate to obtain 8 L of alkali filtrate containing sodium stannate, the tin content is 25 g / l, and the filter residue is 1.2 kg.

[0036] Hydrochloric acid leaching. Add 1.2 kg of water leaching residue to hydrochloric acid solution according to the solid-to-liquid ratio of 1:3, the concentration of hydrochloric acid i...

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Abstract

The invention relates to a method for processing high-tin anode slurry, which solves the problems of low recovery rate of tin and complex flow in prior art. The method comprises the following steps: roasting a mixture of the high-tin anode slurry and alkali to obtain a roasting material; cooling the roasting material, immersing by water and filtering to obtain a sodium stannate-containing alkali filtrate and water-extracted dreg; adding the water-extracted dreg in an acid solution, performing acid leaching to obtain a tin-containing acid solution and precious metal concentrate slag; mixing the sodium stannate-containing alkali filtrate and the tin-containing acid solution and then depositing to obtain the tin-containing sediment and a supernatant; and introducing the supernatant in a subsequent flow for recovering bismuth and lead. The technical scheme can better solve the problems, and the method can be used for industrial production for treating high-tin anode slurry.

Description

technical field [0001] The invention relates to a method for treating high-tin anode slime. Background technique [0002] When tin or copper is processed, some anode slime with high tin content will be produced. These anode slimes are generally not suitable for direct recovery of precious metals, and impurities such as tin need to be recovered first. Document CN93101317.8 discloses a method for extracting precious metals and valuable metals from tin anode slime. The tin anode slime is leached with hydrochloric acid; the leaching solution is replaced with iron powder; the replacement raffinate is neutralized with lime to obtain tin concentrate, and the tin recovery rate is >90%; Recover bismuth by replacing slag, bismuth recovery rate > 90%; hydrochloric acid leaching slag hot water leaching lead, lead recovery (lead leaching rate > 85%); Silver recovery rate > 98%, purity 99.95%, leaching residue mixed acid chlorination, zinc powder replacement, wet recovery and...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B7/00C22B1/02C22B3/04C22B25/06
CPCY02P10/20
Inventor 杜军
Owner SINOPEC SHANGHAI ENG
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