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Comprehensive utilization method for iron ore sintering smoke ash leaching liquid

A technology for extracting liquid and dust, applied in chemical instruments and methods, bismuth compounds, improving process efficiency, etc., can solve problems such as ineffective use of sodium, complex leachate components, loss of calcium and carbonate, etc., and achieve good promotion Application prospects, increasing the added value of raw materials, and the effect of efficient recycling

Inactive Publication Date: 2019-12-24
攀枝花火凤凰再生资源回收利用有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The sintering soot is leached with an aqueous solution. Potassium, sodium, calcium, magnesium, lead and other substances in the raw materials mainly exist in the form of chlorides. During the leaching process, there will be a large amount of potassium, sodium, calcium and a small amount of lead, Bismuth etc. enter the leaching solution, resulting in complex components of the leaching solution. The above-mentioned several patents use purification solutions such as sodium carbonate, evaporation concentration, crystallization and extraction to obtain potassium chloride products, but because the leaching solution is purified by sodium carbonate and sodium is brought into the raw materials, resulting The solution contains a large amount of sodium chloride. Due to the enrichment of sodium chloride, only about 70% of high-quality potassium chloride products can be obtained. The rest of the products are mixtures of potassium and sodium, and the content of potassium chloride can only reach 60-70%. , sodium has not been effectively utilized; at the same time, the purification slag of purification treatment such as sodium carbonate has not been used in any way, resulting in the loss of calcium and carbonate radicals, and new waste residue
It can be seen that although the current treatment process for sintering dust collection has adopted a variety of treatment methods due to the difference in raw materials, there are still many problems and deficiencies.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] a. According to the liquid-solid mass ratio of 2.0:1, add water and sintering soot into the reactor, leaching the sintering soot with water for 1.0 hour at room temperature and a stirring speed of 300 rpm, and obtain the leaching solution and leaching slag;

[0025] b. According to the content of bismuth in the leaching solution obtained in step a, add 100% sodium oxalate in a theoretical amount according to stoichiometry, and precipitate and react for 1.5 hours at 80° C. and a stirring speed of 300 rpm, separate and obtain bismuth oxalate precipitation and filtrate; oxalic acid The bismuth precipitate was washed, dried and calcined at 800°C for 1.0 hour to obtain bismuth trioxide product.

[0026] C, step b gained filtrate, according to the content of lead in the solution, add the sodium chromate of theoretical quantity 120% by stoichiometry, precipitation reaction 1.0h under stirring condition at room temperature 300rpm, separate, wash and obtain lead chromate product...

Embodiment 2

[0034] a. According to the liquid-solid mass ratio of 1.0:1, add water and sintering soot into the reactor, leaching the sintering soot with water for 2.0 hours at room temperature and a stirring speed of 500 rpm, and obtain the leaching solution and leaching slag;

[0035] b. According to the content of bismuth in the leaching solution obtained in step a, add 100% sodium oxalate in a theoretical amount according to stoichiometry, and precipitate and react for 1.0 hour at 60° C. and a stirring speed of 500 rpm, separate and obtain bismuth oxalate precipitation and filtrate; oxalic acid The bismuth precipitate was washed, dried and calcined at 600°C for 2.0 hours to obtain bismuth trioxide product.

[0036] C, step b gained filtrate, according to the content of lead in the solution, add the sodium chromate of theoretical quantity 100% by stoichiometry, precipitation reaction 0.75h under room temperature 200rpm stirring conditions, separation, washing obtain lead chromate produc...

Embodiment 3

[0044] a. According to the liquid-solid mass ratio of 1.5:1, add water and sintering soot into the reactor, and leaching the sintering soot with water for 0.5 hour under the conditions of room temperature and stirring speed of 400rpm, and obtain the leaching solution and leaching slag;

[0045] b. According to the content of bismuth in the leaching solution obtained in step a, add theoretically 100% sodium oxalate according to stoichiometry, and precipitate and react for 2.0 hours at 90°C and a stirring speed of 400rpm, separate and obtain bismuth oxalate precipitate and filtrate; oxalic acid The bismuth precipitate was washed, dried and calcined at 700°C for 1.5 hours to obtain bismuth trioxide product.

[0046] C, step b gained filtrate, according to the content of lead in the solution, add the sodium chromate of theoretical quantity 110% by stoichiometry, precipitation reaction 0.5h under room temperature 400rpm stirring conditions, separation, washing obtain lead chromate ...

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Abstract

The invention discloses a comprehensive utilization method for iron ore sintering smoke ash leaching liquid and belongs to the technical field of industrial waste treatment. According to the comprehensive utilization method, iron ore sintering smoke ash is leached with water, and leaching liquid and leaching residues are obtained through separation; sodium oxalate is added to the leaching liquid,precipitation is conducted, bismuth trioxide products are obtained through washing, drying and calcination, a bismuth precipitation filtrate is subjected to a precipitation reaction with sodium chromate, and lead chromate products are obtained; a lead-separation filtrate is subjected to P507+sulfonated kerosene organic phase extraction and sulfuric acid solution reverse extraction, hydrothermal treatment is conducted, and calcium sulfate whisker products are obtained; and an organic phase extracted aqueous solution is subjected to purification and two stages of conversion reactions, potassiumsulphate and industrial sodium chloride products are obtained. The comprehensive utilization method is simple in technological equipment and easy and safe to operate, potassium, sodium, calcium, lead,bismuth and other elements in sintering ash can be efficiently recycled, additional value of raw materials is increased, resource utilization of sintering smoke ash is achieved, waste is changed intowealth, environmental pollution is reduced, and the comprehensive utilization method has good industrialized application and popularization prospects.

Description

technical field [0001] The invention belongs to the research field of utilization of industrial waste in the metallurgical industry, and in particular relates to a method for comprehensive utilization of iron ore sintering soot and ash leaching liquid. Background technique [0002] Calcium sulfate whiskers are gypsum whiskers, which refer to calcium sulfate (Ca S o 4 ) fibrous single crystal, divided into anhydrous calcium sulfate (CaSO 4 ) whiskers, calcium sulfate hemihydrate (CaSO 4 0.5H 2 O) whiskers and calcium sulfate dihydrate (CaSO 4 2H 2 O) Whiskers. Calcium sulfate whiskers have excellent physical, chemical and mechanical properties such as high temperature resistance, acid and alkali resistance, chemical corrosion resistance, good electrical insulation, high strength, good toughness and compatibility, and easy surface treatment. The material is widely used in the manufacture of plastics, rubber, adhesives, friction materials, coatings, paints, heat insulati...

Claims

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Application Information

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IPC IPC(8): C22B7/02C22B26/20C22B30/06C01D3/04C01D5/08C01F11/46C01G29/00C01G37/14C22B3/00
CPCC01D3/04C01D5/08C01F11/46C01G29/00C01G37/14C01P2004/10C01P2004/54C01P2004/60C01P2004/61C01P2006/80C22B7/006C22B7/02C22B13/045C22B26/20C22B30/06Y02P10/20
Inventor 郑仁和苏毅易德华
Owner 攀枝花火凤凰再生资源回收利用有限责任公司
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