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Method for multilevel vacuum distilling and separating tin-lead alloy

A distillation separation, lead-tin technology, applied in the direction of improving process efficiency, etc., can solve the problems of low metal tin direct recovery rate, low tin direct recovery rate, poor process environment, etc.

Inactive Publication Date: 2009-11-04
KUNMING DIBOO TECH
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  • Abstract
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  • Claims
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AI Technical Summary

Problems solved by technology

[0002] In the known production process of separating tin and lead from lead-tin alloys, the crystallization method can separate lead from tin to a lead content of less than 0.03%, but it requires that the lead content of raw materials be less than or equal to 10%, and the direct recovery rate of metal tin Between 96% and 97%; in other methods, the electrolysis method has stricter requirements on raw materials, requiring that the lead content is less than or equal to 2%, and the metal bismuth content is less than or equal to 0.5%, and the direct recovery rate of metal tin is low, which is 76%. -80%; under the original vacuum distillation process, the lead content in the product metal tin still contains 2%-4%, the direct recovery rate of tin is 97%, and the requirement for raw materials is 78%-89% lead content, these Exist in the method to the requirement of raw material height, or there is the limitation of treatment capacity and treatment effect; Also there is the direct recovery rate of tin relatively low, or the shortcoming of poor process environment; This method is under a kind of vacuum distillation process condition ( The vacuum degree is 0.1Pa-0.5Pa), and the lead content requirements of the lead-tin alloy raw materials are relaxed to the range of 7%-95%, and the lead content in the metal tin of the product can be obtained less than 0.005%

Method used

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  • Method for multilevel vacuum distilling and separating tin-lead alloy
  • Method for multilevel vacuum distilling and separating tin-lead alloy
  • Method for multilevel vacuum distilling and separating tin-lead alloy

Examples

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Embodiment 1

[0019] Material composition: Sn=85.68 mass%, Pb=12.21 mass%, others 2.11 mass%. The molten material is put into a vacuum furnace for primary distillation, the vacuum degree is controlled at 0.1Pa, the distillation temperature is 900°C, the distillation time is 20 minutes, the processing capacity is 240Kg / h, and a total of 9650Kg is processed. 8455Kg of primary crude tin was produced, accounting for 87.6% of the total processing capacity, with lead content of 0.96% and other 2.32%; crude lead output of 1104Kg, accounting for 11.4% of the total processing capacity, tin content of 1.94%, and other 0.52%; The output scum was 79.8Kg, accounting for 0.83% of the total treatment capacity, and the loss was 11.2Kg, accounting for 0.12% of the total treatment capacity. The average power consumption is 342KWh / h.

[0020] The primary crude tin enters the secondary vacuum distillation, the vacuum degree is controlled at 0.3Pa, the distillation temperature is 1200°C, the distillation time ...

Embodiment 2

[0023] Material composition: Sn=21.84 mass%, Pb=77.99 mass%, others 0.17 mass%. The material is put into a vacuum furnace for primary distillation, and the vacuum degree is controlled to 0.1Pa; the distillation temperature is 1050°C, the distillation time is 20 minutes, and the processing capacity is 260Kg / h, with a total of 9500Kg processed. The primary crude tin output is 2185Kg; the primary crude tin enters the secondary vacuum distillation, the vacuum degree is controlled at 0.1Pa, the distillation temperature is 1150°C, the distillation time is 15 minutes, the processing capacity is 150Kg / h, and a total of 8455Kg is processed. The output of the secondary crude tin is 8290Kg; the secondary crude tin enters the tertiary vacuum distillation, and the vacuum degree is controlled to 0.5Pa; the distillation temperature is 1250°C, the distillation time is 10 minutes, the processing capacity is 150Kg / h, and the total processing is 8290Kg. The output of refined tin is 8260Kg, and t...

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Abstract

The invention relates to a method for multilevel vacuum distilling and separating tin-lead alloy, comprising: three-stage vacuum distillation is carried out on raw tin-lead alloy in a vacuum furnace, one-stage distillation temperature is controlled to be 900 DEG C-1050 DEG C, the vacuum degree is 0.1Pa-0.5Pa, and distillation lasts for 10-20min; two-stage distillation temperature is 1100 DEG C-1250 DEG C; and three-stage distillation temperature is 1100 DEG C-1250 DEG C. The lead content in the obtained refined tin product is less than 0.005%, the direct yield coefficients of metallic tin and lead are more than or equal to 98%, and the range of lead content in the raw material is required to be expanded to be 7%-95%, so that the application scope of processing equipment for the raw materials can be enlarged.

Description

1. Technical field [0001] The invention relates to a method for separating lead-tin alloy by multistage vacuum distillation, which is a method for separating and removing lead from lead-tin alloy so that the lead content in the obtained metal tin product is less than 0.005%, and belongs to the technical field of pyrometallurgy. 2. Background technology [0002] In the known production process of separating tin and lead from lead-tin alloys, the crystallization method can separate lead from tin to a lead content of less than 0.03%, but it requires that the lead content of raw materials be less than or equal to 10%, and the direct recovery rate of metal tin Between 96% and 97%; in other methods, the electrolysis method has stricter requirements on raw materials, requiring that the lead content is less than or equal to 2%, and the metal bismuth content is less than or equal to 0.5%, and the direct recovery rate of metal tin is low, which is 76%. -80%; under the original vacuum ...

Claims

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Application Information

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IPC IPC(8): C22B9/02C22B25/08C22B13/02C22C13/00C22C11/06C22C30/04
CPCY02P10/20
Inventor 戴卫平速斌曹劲松杨斌刘大春马文会陈巍汤文通潘建仁贾国斌樊则飞
Owner KUNMING DIBOO TECH
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