Method for preparing pure tin by electrolyzing crude tin

A crude tin and furnace control technology, which is applied in the direction of improving process efficiency, can solve the problems of limited application of electrolytic crude tin, and achieve the effects of strong adaptability of raw materials, short process flow and low production cost

Inactive Publication Date: 2017-03-29
YUNNAN TIN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a method for directly preparing pure tin with electrolytic crude tin, so as to solve the problem of limited application of existing electrolytic crude tin

Method used

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  • Method for preparing pure tin by electrolyzing crude tin
  • Method for preparing pure tin by electrolyzing crude tin
  • Method for preparing pure tin by electrolyzing crude tin

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] (1) Raw material: The raw material is electrolytic crude tin produced by electrolysis, and its main components are shown in Table 4:

[0024] Table 4 Main components of typical electrolytic crude tin

[0025] As Fe Cu Pb Bi Sb Cd Zn Al S Ag Ni+Co 0.010 0.0050 0.0050 27.543 0.100 0.100 0.0006 0.0005 0.0005 0.0003 0.0010 0.0010

[0026] According to GB / T728-2010, the Sn99.90 standard is shown in Table 5:

[0027] Table 5 National Standards for Sn99.90 Products

[0028] Comparing the composition of electrolytic crude tin with the national standard, it is found that As, Pb, Bi, and Sb in electrolytic crude tin cannot meet the requirements of the national standard.

[0029]

[0030] (2) product: adopt the product that the present invention obtains to be tin ingot, and the main composition of typical tin ingot is shown in Table 6:

[0031] Table 6 Main components of typical tin ingots

[0032] As Fe Cu Pb ...

Embodiment 2

[0035] The method of preparing pure tin by electrolytic crude tin melts the electrolytic crude tin produced by electrolysis into a liquid material, presses the liquid material into a vacuum smelting furnace by atmospheric pressure, and removes volatile lead, arsenic, and antimony through vacuum distillation. Prepare pure tin with Sn≧99.9%. The electrolytic crude tin is electrolytic crude tin that can be used to produce tin-lead solder, and its mass components are Sn80.1%, Pb19.5%, As0.05%, Bi0.28%, Sb0.05 %, Fe0.005%, Cu0.005%, Zn0.005%, Al0.002%, S0.001%, Ag0.001%, Ni+Co0.001%. When the vacuum smelting furnace is in operation, the pressure in the furnace is controlled to 9Pa, the distillation time is 20 minutes, and the distillation temperature is 950°C.

Embodiment 3

[0037] The method of preparing pure tin by electrolytic crude tin melts the electrolytic crude tin produced by electrolysis into a liquid material, presses the liquid material into a vacuum smelting furnace by atmospheric pressure, and removes volatile lead, arsenic, and antimony through vacuum distillation. Prepare pure tin with Sn≧99.9%. The mass composition of the electrolytic crude tin is 70% of Sn, 29.1% of Pb, 0.03% of As, 0.8% of Bi, 0.05% of Sb, and 0.02% of other components in total. When the vacuum smelting furnace is in operation, the pressure in the furnace is controlled to be less than 10Pa, the distillation time is 15 minutes, and the distillation temperature is 1000°C.

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Abstract

The invention provides a method for preparing pure tin by electrolyzing crude tin. The method is characterized in that electrolyzed crude tin obtained in electrolyzing is melted into liquid material; the liquid material is pressed into a vacuum smelting furnace through atmosphere pressure; volatile lead, arsenic and antimony removed by vacuum distillation, thus obtaining the pure tin in which Sn is greater than over equal to 99.9%. With the adoption of the method, electrolyzed pure tin at different levels can be treated; the raw material adaptability is high; the direct recovery rate of tin is not less than 92%; the process is simple to operate and easy to control; large-scale mass production can be carried out.

Description

technical field [0001] The invention belongs to the technical field of nonferrous metallurgy, and in particular relates to a method for preparing pure tin. Background technique [0002] In the development process of solder, tin-lead solder has always been a high-quality and cheap soldering material, and both the soldering quality and the reliability after soldering can meet the requirements of use. However, with the strengthening of the environmental awareness of the whole society, the use of heavy metals has been more and more strictly restricted, and the harm of "lead" and its compounds to the human body and the pollution to the environment have been paid more and more attention. [0003] The EU's 2002 / 95 / EC "Directive on Restricting the Use of Certain Hazardous Substances in Electrical and Electronic Equipment" clearly stipulates that six hazardous substances are: "mercury (Hg), cadmium (Cd), hexavalent chromium ( Cr), lead (Pb), polybrominated biphenyls (PBB), polybromi...

Claims

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Application Information

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IPC IPC(8): C22B9/02C22B9/04C22B25/08
CPCC22B9/02C22B9/04C22B25/08Y02P10/20
Inventor王红彬杨成林徐胜利吴红星林崇副陈钢陈云童自伟丁剑李周华
OwnerYUNNAN TIN