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Method for detinning tin-iron alloy through vacuum distillation

A tin-iron alloy and detin technology, applied in the direction of improving process efficiency, can solve the problems of large consumption of other raw materials or metals, changing the existing state of iron and tin metals, complex processes, etc., to achieve efficient recycling, high efficiency, and high technology. simple effect

Active Publication Date: 2010-08-18
KUNMING UNIV OF SCI & TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In the above-mentioned methods, iron and tin are separated by oxidation or other media, the process is relatively complicated, and a large amount of other raw materials or metals are required to be consumed, and the metal existence state of iron and tin has been changed.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] Take 30g of tin-iron alloy containing about 23% Sn, crush it to 10mm~30mm, put it into the vacuum furnace, seal the vacuum furnace and pump air, when the pressure of the vacuum furnace is <5Pa, turn on the cooling water system and start heating at 10°C / min. Make the temperature of the vacuum furnace reach 800°C, then keep the temperature constant, the holding time is 0.5 hours, then start heating at 10°C / min, make the temperature of the vacuum furnace reach 1550°C, the holding time is 1 hour, when the system pressure is <10Pa , turn off the heating system, and when the temperature drops below 200°C, turn off the vacuum pump system and the cooling water system, turn on the vacuum furnace, take out the tin-based condensate from the condenser, and take out the metal iron after detinning from the crucible, and the tin in the product iron is 0.0193%.

Embodiment 2

[0017] Take 1000Kg of tin-iron alloy containing Sn6.2%, crush it into 10mm~30mm, put it into the hearth of vacuum furnace, seal the vacuum furnace and pump air, when the pressure of vacuum furnace reaches 5Pa, open the cooling water system, start at 10℃ / min Heating to make the temperature of the vacuum furnace reach 750°C, the holding time is 1 hour, then start heating at 15°C / min, so that the temperature of the vacuum furnace reaches 1600°C, the holding time is 1 hour, when the system pressure is <10Pa, turn off the heating system , when the temperature drops below 200°C, turn off the vacuum pump system and cooling water system, turn on the vacuum furnace, take out the tin-based condensate from the condenser, and take out the detinned metal iron from the crucible, and the tin content in the product iron is <0.086%.

Embodiment 3

[0019] Take 100g of tin-iron alloy containing about 48.2% Sn, break it into 10mm ~ 30mm, put it into the vacuum furnace, seal the vacuum furnace and pump the air. When the pressure of the vacuum furnace is <5Pa, open the cooling water system and start heating at 5°C / min. Make the temperature of the vacuum furnace reach 750°C, then keep the temperature constant, the holding time is 0.5 hours, then start heating at 10°C / min, make the temperature of the vacuum furnace reach 1450°C, the holding time is 2 hours, when the system pressure is <10Pa , turn off the heating system, and when the temperature drops below 200°C, turn off the vacuum pump system and cooling water system, turn on the vacuum furnace, take out the tin-based condensate from the condenser, and take out the detinned metal iron from the crucible, the product iron contains less than 0.1%.

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PUM

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Abstract

The invention relates to a method for detinning tin-iron alloy through vacuum distillation. The method mainly comprises the following steps: crushing tin-iron alloy (or a metallurgical intermediate material) containing 5-50 percent of tin to 10-30mm, placing the crushed tin-iron alloy in a crucible in a vacuum furnace, sealing the vacuum furnace, and vacuum-pumping until the system pressure is less than 5Pa; starting a cooling water system, switching on a heating system to heat at a rate of 5-15 DEG C per minute until the temperature reaches 700-800 DEG C, and maintaining the temperature for 0.5-1 hour; when the system pressure is less than 10Pa, continuing heating at a rate of 5-15 DEG C per minute until the temperature reaches 1400-1600 DEG C, and maintaining the temperature for 1-2 hour(s); and when the system pressure is less than 10Pa, switching off the heating system, reducing the temperature to below 200 DEG C, switching off the vacuum pump system and the cooling water system, and taking out detinned metal iron from the crucible. The tin content in the obtained metal iron is less than 0.1 percent. The invention can be applied in treatment of various types of tin-iron alloy, and has the advantages of no environmental pollution, low labor intensity and high efficiency of metal separation and recovery.

Description

technical field [0001] The invention relates to the technical field of metal purification, in particular to a method for removing tin by vacuum distillation of a tin-iron alloy. Background technique [0002] A tin-iron alloy, commonly known as "hard head", will be produced in the process of tin smelting by pyrolysis, which contains about 15%-60% Sn; at the same time, the metallic iron obtained by reduction in tin reduction smelting will be melted in tin, resulting in tin The purity is reduced, and after condensing or smelting to remove iron, smelting slag and segregation slag containing 20-35% iron and 30-50% tin will be obtained; in addition, metallic iron will be obtained when the slag of pyro-method tin smelting is strongly reduced The Sn contained in it reaches 5%-15%, which cannot meet the requirements of the subsequent production process for iron, and must be detinned. According to literature reports (Edited by Huang Weisen. "Tin". Metallurgical Industry Press, 2000),...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B25/06C22B9/02
CPCY02P10/20
Inventor 刘永成杨斌戴卫平刘大春徐宝强熊恒蒋文龙邓勇速斌戴永年
Owner KUNMING UNIV OF SCI & TECH