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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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

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

Examples

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Example Embodiment

[0034] Example 1. The regenerated lead smelting slag containing 33% lead, tin 9.81%, antimony 6.92%, and arsenic 4.28% was mixed with 5% lead paste, and a certain amount of NaOH was added, and the stirring and milling leaching was carried out directly. The leaching temperature was 60 ℃, time is 2h, liquid-solid ratio is 2.5:1mL / g, stirring speed is 200rpm, NaOH150g / L, in which tin leaching rate is 85%, arsenic leaching rate is 90%, lead leaching rate is as low as 7%, antimony leaching rate As low as 0.1%, leaching residue and leaching liquid are 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; the leaching solution is a tin-rich arsenic leaching solution, containing 20g / L tin, 9g / L lead, and 9g arsenic. L;

[0036] The tin-rich leaching solution is purified and removed to obtain a sodium stannate solution with lead and arsenic...

Example Embodiment

[0037] Example 2. The regenerated lead smelting slag containing 33% of lead, tin 9.81%, antimony 6.92%, and arsenic 4.28% was mixed with 3% hydrogen peroxide, and a certain amount of NaOH was added to directly carry out stirring and milling leaching, and the leaching temperature was 80°C , Time is 2h, liquid-solid ratio is 3:1mL / g, stirring speed is 400rpm, NaOH120g / L, in which tin leaching rate is 88%, arsenic leaching rate is 89%, lead leaching rate is 10%, and antimony leaching rate is as low as 0.1% , After filtering and washing, the leaching residue and leaching liquid are obtained;

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

[0039] The tin-rich leachate is purified and removed to obtain a sodium stannate solution with lead and arsenic les...

Example Embodiment

[0040] Example 3. The regenerated lead smelting slag containing 33% lead, 9.81% tin, 6.92% antimony, and 4.28% arsenic was mixed with a mixture of 10% lead paste, hydrogen peroxide and sodium peroxide, and a certain amount of NaOH was added and stirred directly Grinding leaching, leaching temperature is 90℃, time is 3h, liquid-to-solid ratio is 5:1mL / g, stirring speed is 300rpm, NaOH120g / L, in which tin leaching rate is 90%, arsenic leaching rate is 94%, and lead leaching rate is 10% , The antimony leaching rate is as low as 0.1%, and the leaching residue and leaching liquid are obtained after filtering and washing;

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

[0042] The tin-rich leachate is purified and removed to obtain a sodium stannate solu...

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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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