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Method for reclaiming zinc and stannum from zinc stannum alloy by vacuum distillation

A distillation recovery and alloy technology, applied in chemical instruments and methods, separation methods, vapor condensation, etc., can solve the problems of being susceptible to air oxidation, reducing product recovery rate, serious environmental pollution, etc., achieving low cost, no environmental pollution, Reasonable effect of craftsmanship

Inactive Publication Date: 2008-06-04
KUNMING UNIV OF SCI & TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method is carried out at normal temperature, and the alloy scrap is easily oxidized by air during the smelting process, which will affect the quality of the product, reduce the recovery rate of the product, and cause serious environmental pollution

Method used

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  • Method for reclaiming zinc and stannum from zinc stannum alloy by vacuum distillation

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] Get 1000Kg zinc-tin alloy waste material, the chemical composition of raw material is: 55 ± 5% Zn, 45 ± 5% Sn (the chemical composition consistency of waste material is poor), adds the fire hearth of vacuum furnace, evacuates after sealing vacuum furnace, makes the vacuum furnace The pressure reaches 20±5Pa, the temperature of the vacuum furnace reaches 850±20°C after 3-4 hours of heating, and then keeps the temperature constant to volatilize the zinc in the raw material for 10 hours, then lower the temperature and make it The temperature of the vacuum furnace is less than 500±30°C, and nitrogen is filled into the vacuum furnace, and the vacuum furnace is turned on to obtain 530Kg of crude zinc and 465Kg of crude tin. The chemical composition of zinc is: 98.88% Zn, 0.012% Sn; the chemical composition of tin is: 87.7% Sn 10.53% Zn.

Embodiment 2

[0015] Get 1500Kg zinc-tin alloy raw material, the chemical composition of raw material is: 60 ± 5% Zn, 40 ± 5% Sn (the chemical composition consistency of waste material is poor), add vacuum furnace, pump air after sealing vacuum furnace, make the pressure of vacuum furnace reach 40±10Pa, the vacuum furnace is heated up for 8 to 12 hours to make the temperature of the vacuum furnace reach 1000°C, and then keep the temperature constant to volatilize the zinc in the raw material. The volatilization time is 12 hours, and then cool down to make the temperature of the vacuum furnace When the temperature is less than 500±50°C, fill nitrogen into the vacuum furnace, turn on the vacuum furnace, and obtain 846Kg of crude zinc and 650Kg of crude tin. The chemical composition of zinc is: 99.8% Zn, 0.0013% Sn; the chemical composition of tin is: 89.0% Sn 10% Zn.

Embodiment 3

[0017] Take 2500Kg zinc-tin alloy raw material, the chemical composition of the raw material is: 70% ± 5Zn, 30% ± 5Sn (the chemical composition of the waste material is poor), put it into the vacuum furnace, seal the vacuum furnace and then pump the air to make the pressure of the vacuum furnace reach 30 ± 5Pa, the vacuum furnace is heated for 5-6 hours to make the temperature of the vacuum furnace reach 1100°C, and then keep the temperature constant to volatilize the zinc in the raw material. The volatilization time is 10 hours, and then cool down to make the temperature of the vacuum furnace less than 500 ±50°C, fill nitrogen into the vacuum furnace, turn on the vacuum furnace, and obtain 1747Kg crude zinc and 748Kg crude tin. The chemical composition of zinc is: 99.95% Zn, 0.0005% Sn; the chemical composition of tin is: 90.0% Sn 9.96% Zn.

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Abstract

This invention relates to a method of recycle zinc and stannum by means of zinc- stannum alloy vacuum distillation. Selecting zinc- stannum alloy as raw material, wherein the percentage content of weight of zinc is 50%-95%, spelter and crude stannum will be obtained with vacuum distillation. And controlled conditions for process consists in vaporizing temperature of 800-1100 degrees, vacuum degree of 10-50Pa, handling time of 12-15 hours and the zinc content in the obtained spelter fulfilling 0# zinc quality. Using in separating zinc- stannum alloy and recycling zinc and stannum without using any chemical agents, it has no environmental contamination, low intensity of labour, low cost of production and high metal recovery ratio.

Description

1. Technical field: [0001] Vacuum pyrometallurgy. 2. Background technology: [0002] The consumption of zinc ranks third among the top ten non-ferrous metals after copper and aluminum. The largest use of metal zinc is galvanizing, followed by the manufacture of various grades of brass and the manufacture of various zinc-based alloys. Metal zinc is widely used in industries such as aerospace, automobiles, ships, steel, machinery, construction, electronics and daily industries. During the use of zinc, a large amount of zinc-containing waste is produced as the product is scrapped. In the case of decreasing zinc resources and increasing demand, the regeneration technology of zinc-containing waste is of great significance for rational recycling of waste, saving resources and reducing environmental pollution. Therefore, the regeneration treatment of such zinc-containing waste deserves attention. Zinc-tin alloy industrial waste is a kind of zinc-containing raw material, which is...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B5/16C22B19/04C22B25/00B01D5/00
CPCY02P10/20
Inventor 杨斌戴永年杨部正赵湘生刘大春马文会韩龙刘永成徐宝强李伟宏唐万启
Owner KUNMING UNIV OF SCI & TECH