Method for preparing sodium stannate from copper anode mud silver separation residue

A technology of copper anode slime and sodium stannate, applied in the direction of improving process efficiency, etc., can solve problems such as the difficulty of recycling tin, and achieve the effects of high recovery rate, simple equipment, and short process flow

Inactive Publication Date: 2014-08-06
JIANGXI UNIV OF SCI & TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Different from the silver slag of copper anode slime for circuit boards, the silver slag of copper anode slime obtained from copper sulfide ore or miscellaneous copper smelting process contains about 30% barium in addition to more lead, silver and tin. It exists in the form of barium sulfate, wrapping a large amount of tin, which brings great difficulties to recover tin from silver slag

Method used

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  • Method for preparing sodium stannate from copper anode mud silver separation residue

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] The main components of the silver separating slag are (%) by weight percentage: Pb15.0, Ag1.76, Ba30.97, Sn7.2.

[0026] Add 480ml of water, 154g of sodium chloride, 53.4ml of 6mol / L hydrochloric acid, and 3.7g of calcium chloride to 50g of silver slag, stir at 80°C for 1 hour, and filter to obtain chlorine salt leaching solution and chloride salt leaching residue; chloride salt leaching residue Add 90ml of concentrated sulfuric acid, leaching at 250°C for 45 minutes to obtain hot acid leaching solution and hot acid leaching slag; add 13g of sodium hydroxide to the hot acid leaching slag, mix evenly and alkali melt at 700°C for 3 hours to obtain calcined sand; After the calcined sand was left to cool to normal temperature, add 80ml of water, stir at 40°C for 1.5 hours, filter to obtain sodium stannate solution and water leaching residue; keep the temperature of sodium stannate solution at 60°C, stir at 300r / min, add The percentage concentration is 5% Na 2 S solution, u...

Embodiment 2

[0028] The main components of the silver separating slag are (%) by weight percentage: Pb12.45, Ag3.86, Ba28.85, Sn8.1.

[0029] Add 900ml of water, 270g of sodium chloride, 95.73ml of 6mol / L hydrochloric acid, and 7.8g of calcium chloride to 100g of silver-separating slag, stir at 90°C for 0.5 hours, and filter to obtain chlorine salt leaching solution and chloride salt leaching residue; chloride salt leaching residue Add 200ml of concentrated sulfuric acid, leaching at 400°C for 35 minutes to obtain hot acid leaching solution and hot acid leaching slag; add 20g of sodium hydroxide to the hot acid leaching slag, mix well, and then perform alkali fusion at 800°C for 1 hour to obtain calcined sand; Let the calcined sand cool to room temperature, add 120ml of water, stir at 30°C for 1 hour, filter to obtain sodium stannate solution and water leaching residue; keep the temperature of sodium stannate solution at 80°C, stir at 400r / min, add mass Min concentration is 10% Na 2 S sol...

Embodiment 3

[0031] The main components of the silver separating slag are (%) by weight percentage: Pb9.78, Ag4.13, Ba24.92, Sn10.3.

[0032] Add 1220ml of water, 415g of sodium chloride, 134ml of 6mol / L hydrochloric acid, and 15g of calcium chloride to 150g of silver slag, stir at 60°C for 2 hours, filter to obtain the chlorine salt leaching solution and chloride salt leaching residue; Sulfuric acid 400ml, leaching at 450°C for 20 minutes to obtain hot acid leaching solution and hot acid leaching slag; adding 30g of sodium hydroxide to the hot acid leaching slag, mixing evenly, and alkali melting at 600°C for 2 hours to obtain calcined sand; Leave to cool to room temperature, add 150ml of water, stir at 50°C for 2 hours, filter to obtain sodium stannate solution and water leaching residue; keep the temperature of sodium stannate solution at 90°C, stirring speed at 300r / min, add mass percent concentration 20% Na 2 S solution, until no black precipitate is produced, after the precipitate i...

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Abstract

The invention relates to a copper anode mud silver separation residue reuse technique, and in particular relates to a method for preparing sodium stannate from copper anode mud silver separation residues. The method comprises the following steps: firstly, leaching the silver separation residues in an acid chlorine salt system so as to leach out lead and silver and feeding lead and silver into a liquid, retaining metals such as tin and barium in the residues, further performing thermal acid leaching on the filtered chlorine salt leaching residues, leaching out barium and feeding into a thermal acid leaching liquid, and retaining tin in thermal acid leaching residues; further performing alkali fusion and water leaching on the thermal acid leaching residues to obtain a sodium stannate solution and water leaching residues; and purifying the sodium stannate solution to remove residual impurities such as lead, copper and antimony, and subsequently performing evaporative crystallization to obtain a sodium stannate product. By adopting the method, tin in the copper anode mud silver separation residues can be effectively opened and recycled to prepare a qualified sodium stannate product, the tin recycling rate is greater than 90%, and the method has the characteristics of short process route, simple equipment, high recycling rate and the like, and is particularly applicable to preparation of sodium stannate from copper anode mud silver separation residues obtained in the copper sulphide ore or scrap copper production process.

Description

technical field [0001] The invention relates to a recycling technology for separating silver slag from copper anode slime, in particular to a method for preparing sodium stannate from copper anode slime separating silver slag. Background technique [0002] Silver separation slag is the residual residue after extracting precious metals gold, silver, platinum, palladium and copper, selenium, tellurium and other valuable metals from copper anode slime. The main components are barium, lead, tin, a small amount of silver, gold and a small amount of platinum ,palladium. In recent years, with the increase in the amount of miscellaneous copper, the tin content in the silver slag of copper anode slime has been increasing, and it has become a good secondary resource of tin with high recycling value. [0003] At present, there are not many domestic researches on the recycling of tin from the silver slag, and most smelters return the silver slag to the pyromelting furnace (application ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B7/00C22B25/06
CPCY02P10/20
Inventor 汪金良黄绍勇郑春到赵向民胡建辉王日林东和沈广鑫刘永平吴艳新陈善文周宇飞贺山明朱伟伟陈亚州
Owner JIANGXI UNIV OF SCI & TECH
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