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Method for deep removal of bismuth through vacuum distillation of high-bismuth crude tin alloy

A high-bismuth crude tin and alloy technology, applied in the field of non-ferrous metal metallurgy, can solve the problems of long process, serious metal backlog, low element recovery rate, etc., and achieve the effects of short turnover period, low production cost, and improved element recovery rate.

Inactive Publication Date: 2016-10-26
永兴佳盛环保科技有限责任公司
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  • Abstract
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Problems solved by technology

[0003] At present, most of the traditional treatment processes are electrolytic refining. The method is to mix high-bismuth crude tin alloy with a large amount of bismuth-free crude tin or low-bismuth crude tin alloy, configure it in a certain proportion, and use crude tin electrolysis for recovery. Tin enters the cathode tin and is recovered through tin refining, and bismuth enters the electrolytic anode slime for further recovery. This method has a long process, a serious backlog of metals, and a low recovery rate of elements.

Method used

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  • Method for deep removal of bismuth through vacuum distillation of high-bismuth crude tin alloy

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Embodiment 1

[0014] Embodiment 1: as figure 1 As shown, the method for removing bismuth by vacuum distillation depth of the high-bismuth thick tin alloy is as follows: First, the high-bismuth thick tin alloy raw materials (composition: Sn67.5%, Bi30.5%, Sb1.2%, Cu0.8%) into the melting pot to melt, start the first distillation process, the melting temperature is 450°C-500°C, the vacuum degree in the control equipment is 0.01-0.1Pa, the heating control temperature is 1150-1250°C, and the feeding system is turned on Continuously inject high-bismuth coarse tin melt into the vacuum equipment for 24 hours, and the injection rate is 420kg / h. The difference in vapor pressure of each element in the material is used to achieve distillation separation, and the distillation process continuously produces residue products and volatile products. After the test, a total of 100 tons of raw materials were input. The obtained residue is a section of crude tin alloy, totaling 64.5 tons, and its composition...

Embodiment 2

[0015] Embodiment 2: as figure 1 As shown, the method for the deep removal of bismuth by vacuum distillation of the high-bismuth thick tin alloy is as follows: first, the high-bismuth thick tin alloy raw material (composition is: Sn49.8%, Bi48.7%, Pb0.8%, Cu0.6%) into the melting pot to melt, start the first distillation process, the melting temperature is 450°C-500°C, the vacuum degree in the control equipment is 0.01-0.1Pa, the heating control temperature is 1150-1250°C, and the feeding system is turned on Continuously inject high-bismuth coarse tin melt into the vacuum equipment for 24 hours, and the injection rate is 380kg / h. The difference in vapor pressure of each element in the material is used to achieve distillation separation, and the distillation process continuously produces residue products and volatile products. After the test, a total of 100 tons of raw materials were input. The obtained residue is a section of crude tin alloy, totaling 45.5 tons, and its comp...

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Abstract

The invention relates to a method for deep removal of bismuth through vacuum distillation of high-bismuth crude tin alloy, and belongs to the field of nonferrous metal metallurgy. The method is characterized in that the high-bismuth crude tin alloy adopted as a raw material is treated in a two-stage vacuum distillation mode; in the first stage vacuum distillation, the high-bismuth crude tin alloy is added to a vacuum smelting device, and the 24h raw material treating capacity is 9-10 t when the vacuum degree in the device is controlled to be 0.01-0.1 Pa and the heated temperature is controlled to be 1150-1250 DEG C; and in the second stage vacuum distillation, volatile matters obtained after the first stage distillation are adopted as a raw material, and the 24h raw material treating capacity is 12-13 t when the vacuum degree in the device is controlled to be 0.1-1 Pa and the heated temperature is controlled to be 950-1050 DEG C. Crude tin alloy with the Bi content being smaller than 0.01% and crude bismuth alloy with the Sn content being smaller than 0.1% can be respectively obtained through the two-stage distillation. 730-760 kilowatt hours of power are consumed in the comprehensive treatment of every ton of the material. The method mainly adopting an environmental-protection and high-efficiency vacuum metallurgy technology to treat the high-bismuth crude tin alloy has the advantages of realization of tin and bismuth separation, short process flow and high economic benefit.

Description

technical field [0001] The invention relates to a method for removing bismuth by deep vacuum distillation of a high-bismuth coarse tin alloy, which belongs to the field of nonferrous metallurgy. Background technique [0002] High-bismuth crude tin alloys widely exist in the non-ferrous metal smelting industry. They are an intermediate product of bismuth smelting and tin smelting. The bismuth content is generally 30%~40%, and the rest is mostly tin, containing a small amount of impurities such as antimony and copper. . High-bismuth crude tin alloys also exist in the field of comprehensive recycling of electronic waste, that is, the field of utilization and development of the so-called "urban mine", such as scraps produced in the process of mounting electronic components; waste electronics and circuit boards are obtained after recycling, sorting, and smelting crude alloy. Its bismuth content is generally 40% to 50%, and most of the rest is tin, containing a small amount of i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B9/02C22B7/00C22B25/02C22B25/06C22B30/06
CPCC22B7/001C22B9/02C22B25/02C22B25/06C22B30/06Y02P10/20
Inventor 何得锍卜京丞李昱羿
Owner 永兴佳盛环保科技有限责任公司
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