DC electric furnace-fuming furnace combined tin-smelting method

A technology of fuming furnace and electric furnace, which is applied in the field of tin smelting technology, can solve the problems of low production capacity and inability to process high-iron tin concentrate, and achieve the effects of low iron content, simple flue gas treatment facilities, and excellent technical and economic indicators

Inactive Publication Date: 2010-07-28
YUNNAN TIN GROUP HLDG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method can solve the problem that the traditional three-phase submerged thermal electric furnace cannot process high-iron tin concentrate and has low production capacity, and is conducive to improving the direct recovery rate and total recovery rate of tin

Method used

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  • DC electric furnace-fuming furnace combined tin-smelting method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Embodiment 1: the steps are as follows:

[0019] A. The chemical composition of the tin concentrate used is as follows:

[0020] the element

sn

Fe

al 2 o 3

SiO 2

CaO

Content%

41

17

4

8

1

[0021] B. Use a 600KVA DC electric furnace for smelting. During the process, add diced coke accounting for 12% of the material weight and a particle size of 20-40mm. Control voltage 150-250V, current 2000-4000A, smelting time 4 hours, and produce crude tin containing Sn 97 %, Fe 0.2%, slag contains Sn 4%, FeO 42%, CaO 2%, SiO 2 22%, Al 2 o 3 6%, the degree of silicic acid is 1.2, the direct recovery rate of tin metal is 93%, and the power consumption is 900 degrees / ton ore.

[0022] C. Use 2m 2 The slag in the fuming furnace treatment step B is sprayed with pulverized coal to control the temperature at 1250°C, and then the theoretical amount of pyrite required for tin vulcanization is added...

Embodiment 2

[0024] Embodiment 2 The steps are as follows:

[0025] The first step is the same as step A of Example 1.

[0026] B. Use a 1250KVA DC electric furnace for smelting, adding 12% of the weight of the material, coke with a particle size of 20-40mm, controlling voltage 150-250V, current 5000-8000A, smelting time 5 hours, and producing crude tin containing Sn 96 %, Fe 0.4%, slag containing Sn 5%, FeO 38%, CaO 2%, SiO 2 28%, Al 2 o 3 6%, the degree of silicic acid is 1.6, the direct recovery rate of tin metal is 94%, and the power consumption is 1000 degrees / ton ore.

[0027] C. Use 2m 2 The slag in the fuming furnace treatment step B is sprayed with coal powder to control the temperature at 1300°C, and then the theoretical amount of pyrite required for tin vulcanization is added. The smelting time is 4 hours, and the output slag contains 0.2% of Sn, 45% of FeO, and 3% of CaO , SiO 2 32%, Al 2 o 3 6%, the volatilization rate of tin metal is 96%.

[0028] D. Use a 1250KVA...

Embodiment 3

[0029] Embodiment 3 steps are as follows:

[0030] A. The chemical composition of the tin concentrate used is as follows:

[0031] the element

sn

Fe

al 2 o 3

SiO 2

CaO

S

As

Content%

41

17

4

8

1

3.5

1.3

[0032] B. Use 2m 2 The fluidized furnace processes the material in step A. During the process, air is blown in, and coal powder accounting for 5% of the weight of the material is added. The temperature is controlled at 800-850°C and the weak oxidation atmosphere. The sulfur and arsenic in the material volatilize and enter the flue gas for recovery and treatment. The removal rates of sulfur and arsenic are 90% and 80% respectively, and the calcined sand produced will enter the next process.

[0033] C, step are identical with step B, C, D in embodiment 1.

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Abstract

The invention relates to a tin-smelting process, in particular to a method for tin smelting by combining a DC electric furnace and a fuming furnace and for comprehensively recycling iron. The steps of the invention are as follows: reducing agent is added according to the components of tin concentrate, and then, the mixture is put in the DC electric furnace for reduction and smelting to generate metallic tin; and vulcanizing agent and slagging flux are added to liquid slag according to components of the liquid slag, and then, the mixture is put in the fuming furnace to be vulcanized to volatilize the tin in the slag; meanwhile, the mixture is recycled in the form of tin oxide fume; the fumed slag is put in the DC electric furnace in the liquid state, and then, the reducing agent and the flux are added to the fumed slag to be smelted to generate pig iron; meanwhile, the residual sulphur contained in the slag is utilized to continually volatilize the residual tin, and the water-quenched slag can be used as the raw material for building. The method is suitable for processing various tin-containing materials; compared with the traditional tin-smelting method, the tin-smelting method provided by the invention has the advantages of less investment and high tin recovery rate and can comprehensively recycle iron and other valuable metals.

Description

technical field [0001] The invention relates to a tin smelting process, in particular to a method for combined tin smelting with a DC electric furnace and a fuming furnace and comprehensive recovery of iron. Background technique [0002] Tin is one of the earliest metals discovered and used by human beings. The main tin-producing countries in the world are China, Malaysia, Indonesia, Brazil, Bolivia, Thailand, Peru and other countries. my country has a large reserve of tin ore resources and a long history of production. It is a major tin-producing country in the world. At present, the main smelting enterprises are Yunxi Group Company and Guangxi Huaxi Group Company. Most tin smelters adopt the classic tin smelting process of "reduction smelting of tin concentrate - pyro-refining of crude tin - vulcanization and volatilization of tin slag fuming furnace". Reduction smelting equipment from the initial blast furnace, reverberatory furnace, three-phase submerged heat electric f...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B25/00
CPCY02P10/20
Inventor 雷毅董保生王炜程睿涵
Owner YUNNAN TIN GROUP HLDG
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