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Fire refining method of crude tin

A pyro-refining and crude tin technology, applied in the field of crude tin refining, can solve the problems of high environmental pollution, high labor intensity of workers, poor operating environment, etc., and achieve huge environmental protection benefits, reduce labor intensity of workers, and facilitate the operation.

Active Publication Date: 2014-07-02
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In order to solve the problems of poor operating environment, heavy environmental pollution, and high labor intensity of workers, the present invention provides a crude tin pyro-refining method, through the removal of impurity elements in crude tin, the production conforms to GB / T 728-2010Sn99.95AA or above Standard Refined Tin

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  • Fire refining method of crude tin

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] First, the crude tin melt is removed by a centrifuge to remove iron and arsenic; condensate to remove iron and arsenic; add sulfur to remove copper, then conduct a vacuum distillation to remove lead, bismuth, arsenic, and antimony; then add aluminum to remove arsenic and antimony, and finally After the process of removing residual aluminum, refined tin is obtained. Specifically include the following steps:

[0025] (1) Using the traditional method, 100t of crude tin melt containing Sn>75% obtained by electric furnace melting (Sn 83.80%; Pb 8.31%; Sb 6.77%; Bi 0.27%; As 0.388%; Cu 0.221%; Fe 0.228%), to remove iron and arsenic by centrifuge and condensate to remove iron and arsenic, so that the iron content in the crude tin melt is 0.0023%;

[0026] (2) Using traditional methods, the crude tin melt obtained in step (1) is subjected to sulfuration and copper removal operations, so that the copper content in the crude tin melt is 0.0032%;

[0027] (3) The crude tin melt ...

Embodiment 2

[0030] First, the crude tin melt is removed by a centrifuge to remove iron and arsenic; condensate to remove iron and arsenic; add sulfur to remove copper, then conduct a vacuum distillation to remove lead, bismuth, arsenic, and antimony; then add aluminum to remove arsenic and antimony, and finally After the process of removing residual aluminum, refined tin is obtained. The method for pyro-refining of described crude tin specifically comprises the steps:

[0031] (1) Using the traditional method, 70t of crude tin melt containing Sn>75% obtained by smelting in a reverberatory furnace (Sn 96%; Pb 1.15%; Sb 1.27%; Bi 0.087%; As 0.47%; Cu 0.25%; Fe 0.748%), to remove iron and arsenic by centrifuge and condensate to remove iron and arsenic, so that the iron content in the crude tin melt is 0.0036%;

[0032] (2) Using traditional methods, the crude tin melt obtained in step (1) is subjected to sulfuration and copper removal operations, so that the copper content in the crude tin ...

Embodiment 3

[0036] Remove iron and arsenic from the crude tin melt through a centrifuge; condensate to remove iron and arsenic; add sulfur to remove copper; Remove iron and arsenic; condensate to remove iron and arsenic; add sulfur to remove copper, then carry out a vacuum distillation to remove lead, bismuth, arsenic and antimony; then add aluminum to remove arsenic and antimony, and finally go through the process of removing residual aluminum to obtain refined tin. The method for pyro-refining of described crude tin specifically comprises the steps:

[0037] (1) Using the traditional method, 100t of crude tin melt with Sn content > 75% obtained by smelting 100t in Ausmelt furnace (Sn 86.80%; Pb 5.34%; Sb 6.74%; Bi 0.42%; As 0.248%; Cu 0.210%; Fe 0.251%), to remove iron and arsenic by centrifuge and condensate to remove iron and arsenic, so that the iron content in the crude tin melt is 0.0026%;

[0038] (2) Using traditional methods, the crude tin melt obtained in step (1) is subjecte...

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Abstract

The invention provides a method for refining crude tin by fire. First, the crude tin melt is removed through a centrifuge to remove iron and arsenic; it is condensed to remove iron and arsenic; after adding sulfur to remove copper, a vacuum distillation is performed to remove lead, bismuth, and Arsenic and antimony; then add aluminum to remove arsenic and antimony, and finally go through the process of removing residual aluminum to obtain refined tin. The key to the method provided by the invention is to use a vacuum distillation process instead of a continuous crystallizer process to remove lead and bismuth, which reduces the labor intensity of workers, greatly reduces the amount of aluminum metal and the production of slag (AlAs, AlSb), and improves the direct recovery of tin. It has huge environmental benefits, economic benefits and safety benefits for tin production enterprises. The entire process is safe and controllable, easy to operate, requires simple equipment, has high universal applicability to raw materials, can effectively process crude tin with different tin compositions, has a high direct tin recovery rate, and produces less waste residue.

Description

technical field [0001] The invention belongs to the technical field of pyrometallurgy of nonferrous metals, and relates to a method for refining crude tin. Background technique [0002] The crude tin produced by reduction smelting of tin ore contains many impurities. Even the tin produced from tin-rich concentrate usually has a purity that cannot meet the requirements of users. Common impurities in crude tin include iron, arsenic, antimony, copper, lead, bismuth, sulfur, etc., which have a great influence on the properties of tin. In order to meet the quality requirements of refined tin of standard grades, tin refining must always be carried out. Under certain circumstances, the comprehensive utilization rate of raw materials can be improved and the pollution to the environment can be reduced during refining. [0003] The composition of crude tin produced by various smelters fluctuates widely, which mainly depends on the composition of tin concentrate, the pre-smelting trea...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B25/08
Inventor 杨斌刘大春李一夫戴卫平徐宝强戴永年速斌蒋文龙曹劲松邓勇熊恒王飞
Owner KUNMING UNIV OF SCI & TECH
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