A method for recovering tin from tellurium-depleted pregnant solution

By using a two-step method of "neutralization and impurity removal - hydrolysis and tin deposition", the problems of high tin recovery cost and high impurity content in existing technologies are solved, achieving efficient tin recovery and reducing impurity content, and simplifying the process.

CN121183136BActive Publication Date: 2026-07-10JIANGXI COPPER TECHNOLOGY RESEARCH INSTITUTE CO LTD
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Patent Information

Application Number
CN202511155370.7
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2025-08-18
Publication Date
2026-07-10
Estimated Expiration
2045-08-18

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Abstract

The application discloses a method for recovering tin from tellurium precipitation post-liquid, based on the characteristics of tin tetrachloride being easy to hydrolyze, a two-step method of 'neutralization and impurity removal-hydrolysis and tin precipitation' is adopted to realize efficient extraction of tin in the tellurium precipitation post-liquid, first, the pH value is adjusted for stirring and impurity removal, then heating hydrolysis and tin precipitation are carried out, the direct recovery rate of tin is above 95%, the tin content of the product is also as high as above 40%, the lead content is below 0.5%, and the chlorine content is below 2%, compared with the existing conventional neutralization and precipitation method, the alkali liquor used by the application is less, and the impurity rate in the tin material obtained is lower.
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Patent Citations

  • Method for comprehensively recovering valuable metals from low-grade tellurium slag

    CN102002597A

  • Resource method of waste tin-stripping liquid

    CN106241882A