Method for treating low-tin materials through reverse expanding rotary kiln

A rotary kiln and material technology, applied in the field of non-ferrous metal metallurgy, can solve the problems of complex structure, difficult operation and large equipment investment, and achieve the effect of simple operation, less equipment failure and small investment.

Pending Publication Date: 2019-05-31
株洲湘三特环保有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0017] The technical problem to be solved by the present invention is to improve the rotary kiln with small investment, simple structure and easy operation, and directly build a reaction pool for the fuming and volatilization of tin element in the rotary kiln with a simple and reasonable structure, so as to solve the problem of existing technology. Dealing with low-tin materials faces the problems of large equipment investment, complex structure, and difficult operation

Method used

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  • Method for treating low-tin materials through reverse expanding rotary kiln
  • Method for treating low-tin materials through reverse expanding rotary kiln
  • Method for treating low-tin materials through reverse expanding rotary kiln

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0054] Example: such as figure 1 As shown, a reverse-expanding rotary kiln for processing low-tin materials includes a cylinder 1 arranged obliquely. The cylinder 1 is an inner hollow rotating body of the reverse-expanding rotary kiln. The front end is a kiln head port 10, and the rear The end is the kiln tail port 11, and the height of the kiln head port 10 is lower than the height of the kiln tail port 11. Between the kiln head port 10 and the kiln tail port 11 of the cylinder body 1, a reaction pool section 7 is arranged in sequence from front to back. , the melting section 8, the drying section 9; the reaction pool section 7 is composed of the front wall section 2, the bottom surface section 4 and the back wall section 3; The concave space is naturally formed, forming a molten reaction tank 5 with sufficient volume to accommodate the molten reaction materials and to allow the reaction materials to have sufficient reaction time here.

[0055] Due to the low manufacturing c...

experiment example 1

[0083] The zinc high-acid leaching slag containing 20% ​​moisture, 2% Sn, and 4% Zn is mixed with anthracite according to 10% of the dry slag weight of the zinc high-acid leaching slag, and the mixed material is discharged from this site at a speed of 13.5t / h. The kiln tail port of the reverse-expanded rotary kiln described in the invention is continuously fed into the drying section of the rotary kiln. The outer diameter of the kiln tail port of the rotary kiln is 3.2m, the length is 0.3m, the average thickness of the steel plate of the cylinder is 40mm, and the thickness of the lining firebrick is 680mm; the outer diameter of the drying section is 3.2m, the length is 18m, the average thickness of the steel plate of the cylinder is 40mm, and the thickness of the lining firebrick is 300mm ; The outer diameter of the melting section is 3.6m, the length is 15m, the average thickness of the cylinder steel plate is 45mm, and the thickness of the lining refractory brick is 300mm; T...

no. 2 example

[0086] For the rich slag of Ausmelt furnace containing 7% Sn, anthracite is added according to 15% of the weight of the rich slag and mixed, and the mixed material is continuous from the kiln tail port of the reverse-expanded rotary kiln described in the present invention at a speed of 13.8t / h Added to the drying section of the rotary kiln. The outer diameter of the kiln tail port of the rotary kiln is 3.6m, the length is 0.3m, the average thickness of the steel plate of the rotary kiln shell is 45mm, and the thickness of the lining refractory brick is 720mm; The thickness of the brick is 350mm; the outer diameter of the melting section is 4.0m, the length is 18m, the average thickness of the cylinder steel plate is 50mm, and the thickness of the inner refractory brick is 350mm; the outer diameter of the bottom section is 4.5m, the length is 24m, the average thickness of the cylinder steel plate is 55mm, and the thickness of the inner refractory brick 420mm; the outer diameter...

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Abstract

The invention discloses a method for treating low-tin materials through a reverse expanding rotary kiln. After the low-tin materials containing 2% to 12% of Sn are mixed with raw coal, the mixture isconveyed into the reverse expanding rotary kiln; under the action of high-temperature smoke generated by combustion in a barrel, material drying, material melting and tin reduction volatilization arecompeted in sequence, and thin sulfiding volatilization is completed under the combined action of pyrite powder; stannic oxide powder is generated in the smoke, and finally the stannic oxide powder inthe smoke is recycled outside the barrel of the rotary kiln; and meanwhile smelted common solid waste residues are generated. The rotary kiln comprises the obliquely arranged barrel. The barrel is sequentially provided with a reaction pond section, a smelting section and a drying section from front to back. A melting reaction pond is formed in the lower portion of a cavity of the reaction pond section. The bottom face section of the reaction pond section is reversely expanded from front to back. When the reverse reducing reaction pond is utilized for treating the low-tin materials, the investment is low, the structure is simple and reasonable, operation is easy, and the number of equipment failures is small.

Description

technical field [0001] The invention relates to a method for treating low-tin materials by using a reverse-expanding rotary kiln, belonging to the field of nonferrous metal metallurgy. Background technique [0002] In the non-ferrous metal smelting process, leaching slag, slag and other waste slag will be produced. Some of these waste residues contain Sn2-12% tin metal elements. Although the grade of tin metal elements is low, they still have the value of recycling. More importantly, by recovering tin metal elements in these waste residues, these waste residues can be treated harmlessly. In the waste treatment and recycling industry, such waste residues are called low-tin materials. [0003] The treatment of low-tin materials is to volatilize the tin element in the material at high temperature. According to the lower boiling point of the low-priced sulfide of tin, volatilization adopts pyrite fuming volatilization, so that the stannous oxide in the molten material, The st...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B7/00C22B25/02C22B25/06C22B19/20C22B19/30C01G19/02F27B7/02F27B7/22F27B7/26F27B7/28
CPCY02P10/20
Inventor 陶政修李剑胜张佳栋谢红斌
Owner 株洲湘三特环保有限公司
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