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A kind of method of recovering tin from sponge tin

A sponge and molten salt technology, applied in the field of metallurgy, can solve the problems of difficult control and effective recycling of harmful fumes, complicated process flow, and high environmental protection pressure, and achieve the effects of low viscosity, simple process flow, and less metal entrainment

Active Publication Date: 2021-02-19
昆明先导新材料科技有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

There is no potential safety hazard of lye splashing in this method, but a large amount of tin-containing alkali slag needs secondary recovery of tin
Moreover, in the process of secondary recovery of tin, multiple reduction smelting is required to extract tin, which makes the overall process complicated, and the large amount of harmful fumes produced during the reduction smelting process are difficult to control and effectively recycle, and the pressure on environmental protection is high. Big
[0005] The existing method for recovering tin from sponge tin has a low recovery rate, and a large amount of slag is generated, which requires follow-up treatment and complicated process

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] A kind of method that reclaims tin from sponge tin as an embodiment of the present invention, described method comprises the following steps:

[0037] (1) Sponge tin is put into the compacting machine and pressed to obtain agglomerated sponge tin, and the sponge tin is taken out to measure the moisture content, and the agglomerated sponge tin is put into the graphite crucible according to the dry weight of the sponge tin;

[0038] (2) After the dry weight of sponge tin and the weight ratio of chlorinated molten salt are 1:1, after the chlorinated molten salt is evenly covered on the sponge tin surface after step (1), the sponge tin covered with chlorinated molten salt Carry out heating and smelting, the heating and melting temperature is 250 DEG C, keep at 250 DEG C for 30min during the heating and melting process, the chlorinated molten salt is composed of 90% by weight of ammonium chloride and 10% by weight of calcium chloride;

[0039] (3) After heating, stirring and...

Embodiment 2

[0042] A kind of method that reclaims tin from sponge tin as an embodiment of the present invention, described method comprises the following steps:

[0043] (1) Sponge tin is put into the compacting machine and pressed to obtain agglomerated sponge tin, and the sponge tin is taken out to measure the moisture content, and the agglomerated sponge tin is put into the graphite crucible according to the dry weight of the sponge tin;

[0044] (2) After the weight ratio of sponge tin dry weight and chlorinated molten salt is 2:1, after the chlorinated molten salt is evenly covered on the sponge tin surface after step (1) processing, to the sponge tin covered with chlorinated molten salt Carry out heating and smelting, the heating and melting temperature is 300°C, keep at 300°C for 60min during the heating and melting process, and the chlorinated molten salt is composed of 70% by weight of ammonium chloride and 30% by weight of calcium chloride;

[0045] (3) After heating, stirring a...

Embodiment 3

[0048] A kind of method that reclaims tin from sponge tin as an embodiment of the present invention, described method comprises the following steps:

[0049] (1) Sponge tin is put into the compacting machine and pressed to obtain agglomerated sponge tin, and the sponge tin is taken out to measure the moisture content, and the agglomerated sponge tin is put into the graphite crucible according to the dry weight of the sponge tin;

[0050] (2) After the dry weight of sponge tin and the weight ratio of chlorinated molten salt are 4:1, after the chlorinated molten salt is evenly covered on the surface of the sponge tin after step (1), the sponge tin covered with chlorinated molten salt Carry out heat smelting, heat smelting temperature is 400 ℃, stir with graphite agitator with 50r / min in the heat smelting process, keep 60min at 400 ℃ in the heat smelting process, described chlorinated molten salt is made of the chlorine of 50% by weight ammonium chloride and 50% calcium chloride ...

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Abstract

The invention provides a method for reclaiming tin from sponge tin, said method comprising the following steps: (1) reducing the moisture and air content in the sponge tin; (2) uniformly covering the chlorinated molten salt in step (1) After treating the surface of the sponge tin, the sponge tin covered with chlorinated molten salt is heated and smelted at a temperature of 250-550°C. The chlorinated molten salt is ammonium chloride, stannous chloride, sodium chloride and one or more of calcium chloride; (3) heat, stir and smelt and then lower the temperature to obtain tin metal. The method of the invention has simple technological process, does not have the problem of secondary treatment and recovery of tin in scum, does not produce pollution, improves the recovery rate and purity of tin, and the recovery rate reaches 98.6%.

Description

technical field [0001] The invention belongs to the field of metallurgy, in particular to a method for recovering tin from sponge tin. Background technique [0002] In the wet production process of tin, only sponge tin can be obtained after replacement, electrolytic refining and other processes. Sponge tin also needs to undergo a smelting process to obtain metallic tin. At present, the methods of smelting sponge tin are mainly charcoal powder smelting method and sodium hydroxide stirring alkali boiling method. Wu Yujiao et al. pressed the sponge tin to remove most of the water, then put it into a small graphite crucible for compaction, and spread wood carbon powder on the surface of the sponge tin and compacted it. After melting at 350°C for 1.5 hours, remove the Surface charcoal powder, tin liquid was scooped out and cast, and the obtained tin recovery rate was 68.8%. During the smelting process, since the carbon powder is loose and cannot isolate the air, and the charco...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B7/00C22B25/02C22B25/06
CPCC22B7/003C22B25/02C22B25/06Y02P10/20
Inventor 刘鸿飞殷亮朱刘
Owner 昆明先导新材料科技有限责任公司
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