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Method for distilling and purifying crude tin alloy in vacuum

An alloy and crude tin technology, applied in the field of vacuum distillation and purification of crude tin alloy, can solve the problems of low tin recovery rate, low lead content, no mention of lead, etc., and achieve the effect of good working environment and low labor intensity

Active Publication Date: 2010-09-01
KUNMING DIBOO TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The content of lead in the material of this method is low, and the condition of vacuum distillation is mainly the removal of antimony, without mentioning the direction of lead, and the recovery rate of tin is also low

Method used

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  • Method for distilling and purifying crude tin alloy in vacuum

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Comparison scheme
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Embodiment 1

[0018] Embodiment 1: The mass percentage of main components of raw materials: Pb=66.9%, Sn=26.42%, Sb=6.34%. The total amount of raw materials is 20 tons. The raw materials are processed in a 1# vacuum furnace, the vacuum degree is controlled at 0.5Pa, the distillation temperature is 1100°C-1150°C, and the distillation time is 20 minutes, that is, the daily processing capacity of the equipment is 6-6.5t. The obtained product composition is: Pb-Sn-Sb alloy (crude lead): Sn=0.85%, Sb=7.81%, the rest is Pb; product crude tin: Pb=2.94%, Sb=3.83%, the rest is Sn. The raw materials are treated in a 1# vacuum furnace, and the direct yields obtained are: Pb=97%; Sn=98.8%; Sb=88.7%.

[0019] Crude tin is then processed in a 2# vacuum furnace, the vacuum degree is controlled at 0.1Pa, the distillation temperature is 1200°C-1250°C, and the distillation time is 15 minutes, that is, the daily processing capacity of the equipment is 3-3.5t. The product composition that obtains is: Pb-Sn-S...

Embodiment 2

[0021] Embodiment 2: The mass percentage of main components of raw materials: Pb=64.93%, Sn=21.64%, Sb=13.25%. Total: 20 tons. The raw materials are processed in a 1# vacuum furnace. The specific parameters of the processing are: vacuum degree 0.5Pa, distillation temperature 1100°C-1150°C, distillation time 20 minutes, that is, the daily processing capacity of the equipment is 6-6.5t. The obtained product composition is: Pb-Sn-Sb alloy (crude lead): Sn=0.61%, Sb=17.2%, the rest is Pb; product crude tin: Pb=3.3%, Sb=4.89%, the rest is Sn. The material is treated in a 1# vacuum furnace, and the direct yield obtained is: Pb=97.59%; Sn=99.59%; Sb=94.14%.

[0022] The crude tin is then processed in a 2# vacuum furnace, the vacuum degree is controlled at 0.1Pa, the distillation temperature is 1200°C-1250°C, the distillation time is 15 minutes, and the daily processing capacity of the equipment is 3-3.5t. The resulting product composition is:

[0023] Pb-Sn-Sb alloy (coarse lead):...

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Abstract

The invention relates to a method for distilling and purifying crude tin alloy in vacuum, comprising: tin and lead which are contained in crude tin material are removed by a two-stage vacuum distillation method. The material is firstly put into a model one vacuum furnace, the vacuum degree is controlled to be 0.1-0.5Pa, the temperature is 1100-1150 DEG C, and the distillation time is 10-20min, sothat crude tin and crude lead can be obtained; the obtained crude tin is then added into a model two vacuum furnace, the vacuum degree is controlled to be 0.1-0.5Pa, the temperature is 1200-1250 DEG C, and the distillation time is 10-20min, so that the less than 1% of Sb, less than 0.05% of Pb and the rest of refined tin product can be obtained, and the direct yield of the metallic tin is more than or equal to 92%.

Description

1. Technical field [0001] The invention relates to a method for purifying crude tin alloy by vacuum distillation, which belongs to the technical field of pyrometallurgy. 2. Background technology [0002] Known methods for refining and purifying crude tin alloy include sodium addition method, magnesium addition method, and aluminum addition method. The common disadvantage of these three methods is that the amount of slag produced is large, and the mass fraction of tin in the generated slag is very high, generally reaching 68% to 75%. Moreover, this process generally requires antimony to be below 1%. For materials with more than 7% tin content, because of the formation of SbSn intermetallic compounds, when Sb is removed by traditional processes, almost all of Sn and Pb in the alloy will be turned into ash (experimental research), giving Sn, Pb in the alloy The recovery of Pb and Sb brings difficulties. [0003] Fluorosilicic acid electrolysis method, during the electrolysis ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B9/02C22B25/02C22B25/08C22C11/10C22C11/06C22C11/08
CPCY02P10/20
Inventor 戴卫平速斌曹劲松杨斌刘大春马文会陈巍李贵
Owner KUNMING DIBOO TECH