Method for opening path for antimony in tin smelting by combining pyrogenic process with wet process

A wet process and pyrotechnic technology, applied in the field of tin smelting, can solve the problems that tin smelters cannot recover tin and antimony economically and efficiently, the amount of anode slime is too large, and the economy is not ideal, so as to reduce the amount of recycling treatment, increase the Large processing capacity, realize the effect of cost-effective open circuit

Pending Publication Date: 2020-08-25
YUNNAN TIN CO LTD TIN BRANCH
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AI Technical Summary

Problems solved by technology

However, in the patent description, due to the high content of antimony in the anode, the anode slime rate is higher, both above 20%, and a large amount of tin is also brought into the anode slime, and the final product obtained is crude tin, which needs to be returned Pyrorefining
Although antimony can be removed into the anode slime in one step, the product needs further treatment due to the large amount of anode slime, and its economic efficiency is not ideal.
[0005] The above methods of treating high-antimony crude tin simply by vacuum distillation (fire method) or electrolytic refining (wet method) cannot economically and efficiently recover tin and open the antimony for large-scale tin smelters, so it is necessary to find a solution An Antimony Open Circuit Method Combining the Advantages of Vacuum Distillation and Electrolytic Refining

Method used

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  • Method for opening path for antimony in tin smelting by combining pyrogenic process with wet process

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Embodiment 1

[0023] A method of combining pyrotechnics and wet processes to open the circuit of antimony in tin smelting, according to figure 1 The process flow shown is for processing 100t of high-antimony crude tin. The high-antimony crude tin is produced by refining crude tin and adding aluminum to remove arsenic and antimony. Tin, and then pre-removed high-antimony crude tin after removing the three impurities of iron, arsenic and copper (during this process, the mixed bismuth and arsenic can also be removed to meet the requirements of refined tin products). During the smelting process, solvents and reducing agents are normally used, and concentrates are used to adjust the furnace grade. Aluminum slag is the refining slag of adding aluminum to remove arsenic and antimony in tin smelting, which is a conventional and mature process. The composition of pre-dedoped high antimony crude tin is Sn 83.59wt.%, Sb 6.54wt.%, Pb 8.95wt.%, As 0.16wt.%, Bi0.28wt.%, and the rest are impurities. Spe...

Embodiment 2

[0028] according to figure 1The process flow shown is for processing 100t of high-antimony crude tin. The high-antimony crude tin is produced by refining crude tin and adding aluminum to remove arsenic and antimony. Tin, and then pre-removed high-antimony coarse tin with three impurities of iron, arsenic and copper removed, its composition is Sn 83.87wt.%, Sb 7.69wt.%, Pb 6.26wt.%, As0.21wt.%, Bi 1.41wt.%, the rest are impurities. Specific steps are as follows:

[0029] (1) Melt high-antimony crude tin at a temperature of 450-550°C, then continuously and evenly add it to a vacuum furnace with a maximum processing capacity of 20t / d, control the processing capacity to 16t / d, and control the distillation temperature at 1200-1250 ℃, the vacuum degree in the furnace is controlled at 2-6Pa. The obtained composition is Sn 97.34wt.%, Sb 1.7wt.%, Pb 0.12wt.%, As 0.025wt.%, Bi0.024wt.%, the remainder is impurity vacuum crude tin 77.20t, and enters the condenser to separate The compo...

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Abstract

The invention discloses a method for opening a path for antimony in tin smelting by combining a pyrogenic process with a wet process. The method for opening the path for antimony in tin smelting by combining the pyrogenic process with the wet process comprises the following steps: refining crude tin and adding aluminum to remove aluminum slag generated by arsenic and antimony, smelting by an electric furnace and then generating high-antimony crude tin, then removing iron, arsenic and copper, then carrying out vacuum distillation, and separating to obtain vacuum crude tin and a tin-lead-antimony alloy; carrying out electrolytic refining on the vacuum crude tin to obtain a fine tin product with a tin content of not less than 99.9wt.%; and then carrying out vacuum distillation on the tin-lead-antimony alloy, and separating to obtain secondary vacuum crude tin and a lead-antimony alloy. According to the method for opening the path for antimony in tin smelting by combining the pyrogenic process with the wet process, the high-antimony crude tin generated through the electric furnace smelting for the aluminum slag is subjected to the combined treatment of vacuum distillation and electrolytic refining to generate the product fine tin which meets the product standards, and the path is opened for antimony which is enriched into the aluminum slag in a tin smelting flow from the tin smelting flow in a manner that most of antimony exists in the form of a lead-antimony alloy and a small amount of antimony exists in the form of refined anode slime, so that the circulation amount of antimony in the tin smelting flow is effectively reduced; and meanwhile, the circulation amount of tin in the refining process is reduced, and tin is recovered in an economic manner.

Description

technical field [0001] The invention belongs to the technical field of tin smelting, and in particular relates to a combined pyrotechnic and wet process, which adopts vacuum distillation and electrolytic refining to jointly process high-antimony crude tin, so as to realize the method of tin smelting antimony open circuit. Background technique [0002] In the tin smelting industry, it has always been a problem to get the impurity antimony out of the tin smelting process in an economical and environmentally friendly way. In the tin refining process, antimony is generally removed by adding aluminum particles to form high-melting aluminum-antimony compounds to obtain aluminum slag with higher tin content. In the past, when the amount of antimony-containing and low-aluminum slag in the raw material was small, the aluminum slag was usually smelted to produce tin-antimony alloys, which were then purified and sold as tin-based bearing alloys. However, in recent years, due to the in...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B25/06C22B25/02C22B25/08C22B9/04C25C1/14C22B9/02C22B30/02C22B7/04
CPCC22B25/06C22B25/02C22B25/08C22B9/04C25C1/14C22B9/02C22B30/02C22B7/04C22B7/001Y02P10/20
Inventor 张璋刘庆东王彦坤宋兴诚杨从兴杨德香白家福
Owner YUNNAN TIN CO LTD TIN BRANCH
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