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A method for treating sulfur dioxide flue gas with alkaline waste residue and recovering tin-antimony metal and sodium sulfite crystals

A technology of sodium sulfite and sulfur dioxide is applied in the preparation of alkali metal sulfites, chemical instruments and methods, separation methods, etc., and can solve the problems of low reaction efficiency, slow reaction speed, tin and antimony output, etc. High recovery rate and the effect of increasing economic benefits

Inactive Publication Date: 2021-09-21
株洲湘三特环保有限公司
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

However, the application effect of this method is not ideal. The main reason is that the aqueous solution of carbon dioxide is very weakly acidic, resulting in a very slow reaction rate and low reaction efficiency. Most of the tin and antimony cannot be produced in the form of hydroxide precipitation, which cannot reach The purpose of recycling tin antimony metal
[0007] In summary, purely from the perspective of economic benefits, the extraction of valuable metals and other chemical raw materials from alkaline waste residues with low grades of valuable metals cannot achieve satisfactory results with existing methods and technical means
On the other hand, in many production enterprises that emit sulfur dioxide-containing flue gas, in order to make the flue gas discharge up to the standard, the desulfurization treatment of the flue gas will consume a lot of resources and financial resources

Method used

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  • A method for treating sulfur dioxide flue gas with alkaline waste residue and recovering tin-antimony metal and sodium sulfite crystals

Examples

Experimental program
Comparison scheme
Effect test

no. 1 example

[0077] (1), Dissolving alkaline waste residue: will contain Na 2 O15%, Sn1%, Sb2% alkaline waste residue 20t, crushed to particle size ≤ 10mm; then in 75m 3 In the leaching tank, add 40m 3 Tap water, turn on the leaching tank mixer, gradually add 20t of broken alkaline waste residue, heat up to 50°C, dissolve the alkaline substance and free sodium oxide in the alkaline waste residue in water, and after dissolving for 6 hours, filter with a filter press to obtain Wet state filter residue 18t and concentration are respectively NaOH: 95g / L, Sn: 5g / L, Sb: 10g / L, Si: 10g / L NaOH, NaOH 2 SnO 3 、Na 3 SbO 4 、Na 2 SiO 3 Mixed solution 36m 3 ; The wet filter residue enters step (3) for processing, and the mixed solution enters step (2) for processing.

[0078] (2) Treatment of sulfur dioxide flue gas: NaOH, Na 2 SnO 3 、Na 3 SbO 4 、Na 2 SiO 3 Mixed solution 36m 3 , by 0.375m 3 The speed of / h is continuously added to the single-stage absorption tower of Φ2800mm×H12000mm wi...

no. 2 example

[0083](1) Dissolving alkaline waste residue: crush 30 tons of alkaline waste residue containing Na2O25%, Sn2.5%, and Sb5% until the particle size is ≤10mm; 3 In the leaching tank, add 90m 3 Tap water, turn on the leaching tank mixer, gradually add 30t of crushed alkaline waste residue into the leaching tank, raise the temperature to 60°C, dissolve the alkaline substance and free sodium oxide in the alkaline waste residue in water, and after 9 hours of dissolution, use a filter press to Filtrate to obtain wet state filter residue 18.8t and concentration is NaOH: 107g / L, Sn: 8.3g / L, Sb: 16.6g / L, Si: 8g / L NaOH, NaOH 2 SnO 3 、Na 3 SbO 4 、Na 2 SiO 3 Mixed solution 84m 3 ; The wet filter residue enters step (3) for processing, and the mixed solution enters step (2) for processing.

[0084] (2) Treatment of sulfur dioxide flue gas: NaOH, Na 2 SnO 3 、Na 3 SbO 4 、Na 2 SiO 3 Mixed solution 84m 3 , according to 3.5m 3 Add it into the second-stage absorption tower of the tw...

no. 3 example

[0089] (1), Dissolving alkaline waste residue: will contain Na 2 o 3 5%, Sn4%, Sb8% alkaline waste residue 75t, crushed to particle size ≤ 10mm; then in a 500m 3 In the dense leaching tank, add 300m 3 Tap water, turn on the dense type leaching tank mixer, gradually add 75t of crushed alkaline waste residue into the dense type leaching tank, raise the temperature to 70°C, and dissolve the alkaline substance and free sodium oxide of the alkaline waste residue in water for 12 hours. Filter with a filter press to obtain a wet filter residue of 33.75t and a concentration of NaOH: 113g / L, Sn: 10g / L, Sb: 20g / L, Si: 5g / L NaOH, Na 2 SnO 3 、Na 3 SbO 4 、Na 2 SiO 3 Mixed solution 291m 3 ; The wet filter residue enters step (3) for processing, and the mixed solution enters step (2) for processing.

[0090] (2) Treatment of sulfur dioxide flue gas: NaOH, Na 2 SnO 3 、Na 3 SbO 4 、Na 2 SiO 3 Mixed solution 291m 3 , by 18.375m 3 Add it into the third-stage absorption tower of t...

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Abstract

The invention relates to a method for treating sulfur dioxide flue gas with alkaline waste residue and recovering tin-antimony metal and sodium sulfite crystals. By crushing and dissolving alkaline waste residue and filtering, NaOH and NaOH are obtained. 2 SnO 3 、Na 3 SbO 4 Mixed solution and filter residue, SO contained in mixed solution in absorption equipment and industrial flue gas 2 The absorption reaction is carried out, so that the SO in the flue gas 2 The content reaches the emission standard, and in the process of absorption reaction, Sn(OH) 4 with Sb(OH) 5 solid precipitate and Na 2 SO 3 The mixed slurry of the solution is subjected to solid-liquid separation to obtain Sn(OH) 4 with Sb(OH) 5 solid precipitate and Na 2 SO 3 solution. Filter residue and Sn(OH) 4 with Sb(OH) 5 The solid precipitate is added to the reduced coal and subjected to high-temperature reduction smelting to obtain tin-antimony metal and smelting slag, and further deplete Na 2 SO 3 The solution was concentrated by evaporation and separated to obtain sodium sulfite crystals. The invention has the advantages of short process flow, high recovery rate of tin-antimony metal, realization of waste treatment with waste, clean and environment-friendly production process, and the like.

Description

technical field [0001] The invention relates to a method for treating sulfur dioxide flue gas and recovering tin-antimony metal and sodium sulfite crystals by using alkaline waste residue, which belongs to the field of industrial waste gas waste treatment and valuable metal recovery. Background technique [0002] At present, in the crude lead fire refining process, some enterprises first carry out condensate removal of copper and sulfur addition to remove copper, then add sodium nitrate and sodium carbonate for oxidation, and at the same time make slag to remove tin and antimony, and produce tin antimony alkali slag; In addition, waste lead-acid battery recycling companies also add sodium nitrate and sodium carbonate for reduction smelting in the process of recycling lead ingots to produce tin-antimony alkali slag. Tin antimony alkali slag contains Pb20~30%, Sn5~10%, Sb10~15%, Na 2 O10-30%. [0003] Add 15-20% of anthracite and 3-6% of limestone to the tin-antimony alkali ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D53/78B01D53/50C01D5/14C22B1/00C22B5/10C22B7/00C22B25/02C22B25/06C22B30/02
CPCY02P10/20
Inventor 陶政修李剑胜赵华谢红斌
Owner 株洲湘三特环保有限公司
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