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Method for producing zinc sulfate heptahydrate, crude tin and crude lead by using tin smelting dust

A technology of zinc sulfate heptahydrate and soot, applied in the field of non-ferrous metal smelting wet-fire combined process, can solve the problems of low reverberatory furnace smelting temperature, low tin remelting direct yield, uneven furnace temperature, etc. The effect of easy industrialization implementation, strong principle adaptability and reasonable process structure

Inactive Publication Date: 2012-02-15
太仓市南仓金属材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since tin smelting dust contains a lot of zinc (Zn3%~26%), and the melting temperature of the reverberatory furnace is not high, and the furnace temperature is not uniform (1300oC~1350oC at the furnace head, 1000oC~1150oC at the furnace tail), so the reprocessing of tin The direct yield of smelting is not high, generally lower than 60%; the crude tin obtained is almost all ethyl tin, the tin grade is less than 80%, and zinc is also difficult to enrich

Method used

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  • Method for producing zinc sulfate heptahydrate, crude tin and crude lead by using tin smelting dust
  • Method for producing zinc sulfate heptahydrate, crude tin and crude lead by using tin smelting dust
  • Method for producing zinc sulfate heptahydrate, crude tin and crude lead by using tin smelting dust

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] Example 1: Raw material electric furnace tin fume main chemical composition mass percentage (mass%): Sn 19.78, Pb 12.30, Zn 26.32, Cu 0.35, As 1.69, Sb 0.62, S 1.25, FeO 1.41, CaO 1.12, SiO2 1.40, Al2O3 1.68 .

[0042] (1) Dehydrate the raw materials to less than 5% by mass, and screen out iron nuggets, slag and other impurities of ≥8-10mm entrained by the machine.

[0043] (2) Under normal temperature and stirring conditions, use the No. 1 12m3 stirring tank for the 1st stage leaching of electric furnace tin fume; first pump into the No. 1 storage tank to process about 10m3 of the second leaching solution of the previous batch of materials, start the mixer, and put in each tank Add 1.25t of industrial sulfuric acid to 3.5t of electric furnace tin fume raw material, add leaching solution twice to a total volume of 12 m3, solid: liquid = 1:3.4 (t:m3), stir and leaching for 2.5h, and the final pH value is 2.5. The leaching slurry is transported by a 65-Z×B-40 self-primin...

Embodiment 2

[0049] Example 2: Raw material reverberatory furnace tin smoke main chemical composition mass percentage (mass %): Sn 28.28, Pb 10.59, Zn 12.45, Cu 0.18, As 0.96, Sb 0.01, S 1.96, slagging elements 16-22.

[0050] (1) Dry the raw materials until the water content is less than 5% by mass, and screen out the massive debris ≥ 8mm entrained by the machine.

[0051] (2) Under normal temperature and stirring conditions, use No. 1 stirring tank as the first-stage leaching of tin fume in the reverberatory furnace. Use the leaching solution twice to adjust the slurry, put 4.8t of raw material of reverberatory furnace tin fume into each tank (time), add 0.86t of industrial sulfuric acid, solid: liquid = 1:2.5 (t:m3), stir and leaching for 2 hours and press filter to obtain a concentration of 29 oBe, crude zinc sulfate solution with pH 2.0 and 1 leaching residue. Quality composition of zinc solution (mass g / L): Zn 82~85, Sn 2.12~2.94, Pb 0.12~0.16, Cu 1.04~1.26, Fe 0.11~0.13, Sb 0.02~0....

Embodiment 3

[0057] Example 3: Raw material secondary (electric furnace) tin fume main chemical composition mass percentage (mass%): Sn 25.24, Pb 2.42, Zn 34.74, Cu 0.30, As 2.41, Sb 0.18, S 0.75, FeO 1.08, CaO 0.34, SiO2 2.51, Al2O3 1.48.

[0058] (1) Dehydrate the raw material to less than 5% by mass, and screen out the massive entrainment ≥ 8mm.

[0059] (2) Under the condition of normal temperature and stirring, the secondary tin fume 1 stage leaching is carried out in the No. 1 stirring tank. Use 2 leaching liquids to adjust slurry, put in 2.8t / tank of secondary tin fume raw material, add industrial sulfuric acid 1.05t / tank, solid:liquid=1:4.3 (t:m3), stir and leaching for 2.5h and press filter to obtain a concentration of 32 oBe, crude zinc sulfate solution with pH 2.5 and 1 leaching residue. The mass composition of the zinc solution (mass g / L): Zn 86-90, Sn 0.96-1.68, Pb 0.11-0.13, Cu 1.32-1.64, Fe 0.13-0.15, Sb 0.08-0.12, sent to the copper removal process for treatment. The 1st...

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Abstract

The invention discloses a method for producing zinc sulfate heptahydrate, crude tin and crude lead by using tin smelting dust. The method comprises the following steps of: (1) pretreating the raw material; (2) leaching with a dilute sulphuric acid to separate out zinc; (3) purifying the crude zinc sulfate solution, preparing zinc sulfate heptahydrate; (4) performing electric furnace smelting on the tin-rich residue to prepare a tin-lead alloy; (5) adopting the conventional liquation process (the temperature is 500-600 DEG C) and the agglutination method (the temperature is 230-240 DEG C) to refine the tin-lead alloy and increase the Sn-Pb grade of the alloy to 94%-96%, and sending the refining residue back to the electric furnace to perform smelting and dosing treatment; and (6) performing high temperature vacuum distillation to produce crude tin and crude lead. By adopting the method, the tin smelting dust can be effectively utilized, the resource can be saved and metals such as tin,lead, zinc and copper can be recovered together.

Description

1. Technical field: [0001] The invention relates to a method for producing zinc sulfate heptahydrate, crude tin and crude lead by using tin smelting dust, and belongs to the technical field of nonferrous metal smelting wet-fire combined process. 2. Background technology: [0002] It is well known that before the 1980s, most of the tin smelting fumes from domestic tin smelters were returned to reverberatory furnaces for re-smelting. Since tin smelting dust contains a lot of zinc (Zn3%~26%), and the melting temperature of the reverberatory furnace is not high, and the furnace temperature is not uniform (1300oC ~ 1350oC at the furnace head, 1000oC ~ 1150oC at the furnace tail), so the reprocessing of tin The direct yield of smelting is not high, generally lower than 60%; the crude tin obtained is almost all ethyl tin, the tin grade is less than 80%, and zinc is also difficult to enrich. [0003] According to Zhao Tiancong, Wang Jian reported in the 1999 edition of "Handbook of...

Claims

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Application Information

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IPC IPC(8): C22B7/02C22B25/06C22B13/00C01G9/06
CPCY02P10/20
Inventor 王文忠杨洪飚林耀新杨茂才
Owner 太仓市南仓金属材料有限公司
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