Mineralization arsenic fixation and tin recovery synergetic method for high-arsenic tin smoke

A technology of mineralization and soot, applied in the direction of improving process efficiency, etc., can solve problems such as low comprehensive recovery rate of valuable elements, limited market for arsenic products, hidden safety hazards, etc., and achieve elimination of hidden dangers of arsenic pollution, low cost, and reduced material volume Effect

Inactive Publication Date: 2018-12-07
KUNMING METALLURGY INST
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Invention patent CN104294053A discloses a method for reducing volatilized arsenic by arsenic-containing smoke and dust to obtain As with a purity of 97%. 2 o 3 , but the roasting process produces secondary pollution
[0004] The research on arsenic pollution control in the tin smelting industry has attracted much attention. The existing research reports on the removal of arsenic from dust and the extraction of valuable metals generally have a low comprehensive recovery rate of valuable elements, the market for arsenic products is limited, and there are potential safety hazards.

Method used

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  • Mineralization arsenic fixation and tin recovery synergetic method for high-arsenic tin smoke

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039]Taking the rotary kiln dust of a tin smelting enterprise in Yunnan as an example, it contains the following main components in terms of mass percentage: Sn 9.42%, As 50.85%, Pb 11.37%. The arsenic-containing fume from tin smelting was placed in a closed ultrasonic equipment for pretreatment. The ultrasonic power was 2k W and the treatment time was 20 minutes. The soot after ultrasonic treatment is separated by eddy current micro-powder classification equipment, the power is 2.5 kW, and the feeding rate is 8 kg / h. See Table 1 for the content.

[0040] Table 1 Particle size distribution and element content of rotary kiln dust classification treatment

[0041] category

Particle size / μm

Mass fraction / %

As / %

Sn / %

Level 1

15～74

25.3

11.4

32.6

level 2

5～15

19.9

32.6

7.53

Level 3

≤5

54.8

67.8

1.32

[0042] The ≤5μm ultra-fine dust obtained by classification is placed in a pressurized reacto...

Embodiment 2

[0045] Taking fuming furnace dust from a tin smelting enterprise in Yunnan as an example, it contains the following main components in terms of mass percentage: Sn 4.97%, As 28.25%, Pb 15.26%. Take the high-arsenic tin fume and place it in a closed ultrasonic equipment for pretreatment. The ultrasonic power is 2k W and the treatment time is 20 minutes. The soot after ultrasonic treatment is separated by eddy current micro-powder classification equipment, the power is 2.5kW, and the feeding rate is 8 kg / h. The contents are shown in Table 2.

[0046] Table 2 Particle size distribution and element content of fuming furnace dust after classified treatment

[0047] category

Particle size / μm

Mass fraction / %

As / %

Sn / %

Level 1

15～74

26.8

5.42

12.7

level 2

5～15

21.4

22.6

3.23

Level 3

≤5

51.8

37.2

0.37

[0048] Take the ultra-fine smoke dust of ≤5μm obtained by classification in a pressurized react...

Embodiment 3

[0051] A method for mineralizing high-arsenic tin fume to fix arsenic and recover tin synergistically, comprising the following steps:

[0052] 1) Ultrasonic pretreatment: Ultrasonic treatment is performed on high-arsenic tin fumes under airtight conditions. The ultrasonic power is 2000W, and the pretreatment time is 30 minutes. Crushing and dispersing; the high-arsenic tin fume is arsenic-containing fume from a tin smelting rotary kiln, with an arsenic content of 28% and a tin content of 4%.

[0053] 2) Micro-powder classification: continue to carry out micro-powder classification of high-arsenic tin fumes, and divide high-arsenic tin fumes into ultra-fine fumes, comprehensive fumes and coarse fumes according to particle size distribution. Metal tin, the comprehensive fume is returned to the ultrasonic pretreatment; the micro-powder classification treatment is to put the fume into the powder collection system respectively according to the particle size distribution standard u...

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Abstract

The invention relates to a mineralization arsenic fixation and tin recovery synergetic method for high-arsenic tin smoke. The method comprises the following steps that (1) ultrasonic pretreatment is carried out, specifically, the high-arsenic tin smoke is subjected to ultrasonic treatment under an airtight condition; (2) micro-powder grading is carried out, specifically, the high-arsenic tin smokecontinues to be subjected to micro-powder grading treatment, and is divided into three grades according to particle size distribution, superfine smoke is subjected to arsenic leaching, coarse smoke is subjected to valuable metal tin recovery, and synthetic smoke returns for ultrasonic pretreatment; (3) selective leaching of arsenic is carried out, specifically, the superfine smoke obtained in a separation mode is subjected to oxygen pressure leaching; (4) leachate catalytic oxidation is carried out, specifically, an iron component is added in leachate to change As3+ in the leachate into As5+in a catalytic oxidation mode; (5) mineralization arsenic fixation is carried out, specifically, the catalytic-oxidized leachate is subjected to the mineralization arsenic fixation reaction under ultrasonic/pressurized coupling action, and solid arsenic minerals are obtained; and (6) the valuable metal tin is recovered. By means of the method, accumulation of arsenic in arsenic-containing smoke ina smelting system is eliminated, harmlessness is achieved, and meanwhile comprehensive recovery of the rare valuable metal tin is achieved.

Description

technical field [0001] The invention belongs to the technical field of non-ferrous metallurgy technology and industrial solid waste resource utilization, and in particular relates to a method for mineralizing high-arsenic tin fume and arsenic-fixing and synergistically recovering tin. Background technique [0002] Arsenic is a highly toxic substance that seriously pollutes the environment. Metalloid arsenic is often associated with non-ferrous metal ores, usually in the form of arsenopyrite, arsenopyrhotite, arsenoferrite, and realgar. The smoke and dust produced in the tin smelting process is a typical arsenic enrichment, containing as high as 25-60% arsenic, and also contains valuable elements such as tin and lead with high added value, which are directly returned to the smelting process, resulting in the continuous accumulation of arsenic in the system. Serious safety and environmental hazards have been caused. However, the application market of arsenic is shrinking. In...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B7/02C22B30/04C22B25/06
CPCC22B7/006C22B7/02C22B25/04C22B25/06C22B30/04Y02P10/20
Inventor 谢容生田林刘维维任帅鹏谢菱芳
Owner KUNMING METALLURGY INST
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