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Method for extracting and separating valuable metal from secondary lead smelting slag

A technology for secondary lead smelting and valuable metals, applied in the direction of improving process efficiency, etc., can solve the problems of acid mist, loss of alkali solution, poor operating environment, etc., and achieve the effect of easy operation, simple process, and improved recycling rate

Active Publication Date: 2016-01-27
BEIJING GENERAL RES INST OF MINING & METALLURGY
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

[0003] The treatment process of secondary lead smelting slag varies with the composition and the type of recovered metals, but the main purpose is to realize the comprehensive recovery of antimony, tin and arsenic and the recycling of alkali. The research on the recycling of tin and antimony is mainly based on acid treatment. Although these methods can better solve the problem of separation of tin and antimony, a large amount of hydrochloric acid is used, which consumes a lot of acid and produces acid mist, which will also cause the loss of alkali solution during the smelting process. The operating environment is poor; in addition, these methods are not suitable for processing lead-tin-antimony slag containing a certain amount of arsenic. Arsenic for remediation and recovery

Method used

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  • Method for extracting and separating valuable metal from secondary lead smelting slag

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Embodiment 1, mix the regenerated lead smelting slag containing 33% lead, 9.81% tin, 6.92% antimony, and 4.28% arsenic into 5% lead paste, add a certain amount of NaOH, and directly carry out stirring mill leaching, and the leaching temperature is 60 ℃, the time is 2h, the liquid-solid ratio is 2.5:1mL / g, the stirring speed is 200rpm, NaOH150g / L, the leaching rate of tin is 85%, the leaching rate of arsenic is 90%, the leaching rate of lead is as low as 7%, and the leaching rate of antimony As low as 0.1%, leach residue and leachate can be obtained after filtering and washing;

[0035] The leaching residue is lead-antimony leaching residue, which contains more than 76% lead, more than 12% antimony, less than 2% tin, and less than 1% arsenic; L;

[0036] The tin-rich leaching solution is purified to remove impurities to obtain a sodium stannate solution with lead and arsenic less than 0.0005 g / L, and after concentration and crystallization, a sodium stannate product wit...

Embodiment 2

[0037] Example 2, mix the regenerated lead smelting slag containing 33% lead, 9.81% tin, 6.92% antimony, and 4.28% arsenic into 3% hydrogen peroxide, add a certain amount of NaOH, and directly carry out stirring mill leaching, and the leaching temperature is 80°C , the time is 2 hours, the liquid-solid ratio is 3:1mL / g, the stirring speed is 400rpm, NaOH120g / L, the leaching rate of tin is 88%, the leaching rate of arsenic is 89%, the leaching rate of lead is 10%, and the leaching rate of antimony is as low as 0.1%. , after filtering and washing, leach residue and leachate are obtained;

[0038] The leaching slag is lead-antimony leaching slag, containing more than 74% lead, more than 12% antimony, less than 2% tin, and less than 1% arsenic; the leaching solution is tin-rich arsenic leaching solution, containing 22g / L tin, 9g / L lead, and 9g / L arsenic L;

[0039] The tin-rich leaching solution is purified to remove impurities to obtain a sodium stannate solution with less than ...

Embodiment 3

[0040] Example 3, mix the regenerated lead smelting slag containing 33% lead, 9.81% tin, 6.92% antimony, and 4.28% arsenic into 10% lead paste, hydrogen peroxide and sodium peroxide mixture, add a certain amount of NaOH, and directly stir Mill leaching, the leaching temperature is 90°C, the time is 3h, the liquid-solid ratio is 5:1mL / g, the stirring speed is 300rpm, NaOH120g / L, among which the tin leaching rate is 90%, the arsenic leaching rate is 94%, and the lead leaching rate is 10%. , the leaching rate of antimony is as low as 0.1%, and the leaching residue and leachate are obtained after filtering and washing;

[0041] The leaching slag is lead-antimony leaching slag, containing more than 74% lead, more than 12% antimony, less than 2% tin, and less than 1% arsenic; the leaching solution is tin-rich arsenic leaching solution, containing 23g / L tin, 9g / L lead, and 11g / L arsenic. L;

[0042] The tin-rich leaching solution is purified to remove impurities to obtain a sodium s...

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Abstract

The invention discloses a method for extracting and separating valuable metal from secondary lead smelting slag. The method includes the steps that a certain amount of oxidizing agent is mixed in the secondary lead smelting slag to be treated; after a certain amount of NaOH solution is added, leaching treatment is conducted in a stirring mill; pulp obtained through leaching treatment is subjected to solid-liquid separation, and filter residues rich in lead and antimony and filtrate rich in tin and arsenic are obtained after washing; the obtained filtrate rich in tin and arsenic is subjected to impurity purifying treatment, and a sodium stannate solution is obtained; and the obtained sodium stannate solution is condensed and crystallized to obtain a sodium stannate product. The method is simple in process and easy to adopt, valuable metal such as tin, antimony and arsenic can be directly separated under the alkaline condition, a qualified sodium stannate product is obtained through subsequent purifying and impurity removing, and the recycling rate of the valuable metal is increased.

Description

technical field [0001] The invention relates to the technical field of nonferrous metal metallurgy, in particular to a method for extracting and separating valuable metals from secondary lead smelting slag. Background technique [0002] At present, due to the high content of valuable metals lead, tin, antimony and arsenic in the secondary lead smelting slag, these metals will be enriched in the smelting slag during the smelting process. and arsenic for separation and comprehensive utilization. [0003] The treatment process of secondary lead smelting slag varies with the composition and the type of recovered metals, but the main purpose is to realize the comprehensive recovery of antimony, tin and arsenic and the recycling of alkali. The research on the recycling of tin and antimony is mainly based on acid treatment. Although these methods can better solve the problem of separation of tin and antimony, a large amount of hydrochloric acid is used, which consumes a lot of aci...

Claims

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Application Information

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IPC IPC(8): C22B25/06
CPCY02P10/20
Inventor 赵峰杨玮娇杨卜李强马保中袁文辉
Owner BEIJING GENERAL RES INST OF MINING & METALLURGY
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