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Method for treating sulfur dioxide flue gas by using alkaline waste residues and recovering tin-antimony metals and sodium sulfite crystals

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

Inactive Publication Date: 2019-06-14
株洲湘三特环保有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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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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  • Method for treating sulfur dioxide flue gas by using alkaline waste residues and recovering tin-antimony metals and sodium sulfite crystals

Examples

Experimental program
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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 by using alkaline waste residues and recovering tin-antimony metals and sodium sulfite crystals. The method comprises the following steps: crushing and dissolving the alkaline waste residues, performing filtration to obtain a NaOH, Na2SnO3 and Na3SbO4 mixed solution and filter residues, carrying out an absorption reaction on the mixed solution and SO2 contained in industrially discharged flue gas in an absorption device to make the SO2 content of the flue gas reach discharge standards and obtain a mixed slurry containing Sn(OH)4 and Sb(OH)5 solid precipitates and a Na2SO3 solution, and carrying out solid-liquid separation on the slurry to obtain Sn(OH)4 and Sb(OH)5 solid precipitates and the Na2SO3 solution; and addingthe filter residues and the Sn(OH)4 and Sb(OH)5 solid precipitates to reduced coal, carrying out high-temperature reduction smelting to obtain tin-antimony metals and smelting furnace slag, and further carrying out evaporative concentration and separation on the Na2SO3 solution to obtain the sodium sulfite crystals. The method has the advantages of short process flow, high recovery rate of the tin-bismuth metals, realization of treatment of wastes with wastes, and clean and environmentally-friendly production process.

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 Applications(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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