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Method for treating steel plant zinc-containing smoke dust through wet process to realize enrichment of zinc sulfide concentrate

A zinc sulfide concentrate and wet processing technology, applied in the direction of improving process efficiency, can solve the problems of difficult to achieve deep separation of iron and zinc, insufficient solubility of zinc ferrite, and high requirements for equipment anti-corrosion, and achieve low equipment anti-corrosion requirements. , The human body and the environment have less toxic and side effects, and the leaching system has a mild effect.

Inactive Publication Date: 2015-09-30
JIANGSU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the operating condition of the alkaline leaching process is a strong alkaline system, which requires high anti-corrosion equipment; in addition, the ligand OH used in the alkaline leaching process - to Zn 2+ The ability to cooperate is weak, the ability to dissolve zinc ferrite in smoke is insufficient, and it is also difficult to achieve deep separation of iron and zinc (see Chinese patent document CN200910119189)

Method used

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  • Method for treating steel plant zinc-containing smoke dust through wet process to realize enrichment of zinc sulfide concentrate

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Experimental program
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Effect test

Embodiment 1

[0028] Blast furnace dust in a steel plant, its main components (wt%): Zn 1.85, Fe 25.63, CaO 10.40, MgO 5.07, Cd 0.15 and Pb 0.03; Reagent: Food grade glycine, content ≥ 99%; Analytical pure NaOH, content ≥ 99.9%; Analytical pure sodium sulfide (Na 2 S·9H 2 O), Na 2 S·9H 2 O content ≥ 98%.

[0029] (1) Leaching: at 60°C, the pH value is 8 prepared with aminoacetic acid and sodium hydroxide, and the total concentration of aminoacetic acid is 0.3mol L -1 According to the liquid-solid ratio of 5:1, 50g of dust was added for leaching. After reacting for 5 hours, the solid and liquid were separated to obtain 210mL of leaching solution; among them, the concentration of Zn was 4.1g L -1 , Pb concentration 67.9mg·L -1 , Cd concentration 337.9 mg·L -1 , Fe concentration 43.3 mg·L -1 , Zn, Pb and Cd leaching rates are greater than 93%, Fe leaching rate is less than 0.1%.

[0030] (2) Sulfide precipitation: the above leachate is at 25°C, and the stirring speed is 300r·min-1 When...

Embodiment 2

[0032] Electric furnace dust in a steel plant, its main components (wt%): Zn 6.35, Fe 31.63, CaO 5.12, MgO 3.84, Cd 1.20 and Pb 0.95; reagent: food grade glycine, content ≥ 99%; industrial grade sodium glycine, Content ≥ 98%; Analytical pure sodium sulfide (Na 2 S·9H 2 O), Na 2 S·9H 2 O content ≥ 98%.

[0033] (1) Leaching: at 75°C, the pH value of glycine and sodium glycine is 8.5, and the total concentration of glycine is 1.2mol L -1 400mL aqueous solution of compounding agent, according to the liquid-solid ratio of 8:1, add 50g of smoke and dust for leaching, after reacting for 5 hours, separate the solid and liquid to obtain 320mL of leachate; among them, the concentration of Zn is 9.4g L -1 , Pb concentration 1.4g L -1 , Cd concentration 1.8g L -1 , Fe concentration 69.5mg·L -1 , Zn, Pb and Cd leaching rates are greater than 93%, Fe leaching rate is less than 0.1%.

[0034] (2) Sulfide precipitation: the above leachate is at 45°C, and the stirring speed is 350r·mi...

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Abstract

The invention relates to the field of comprehensive utilization of solid waste resources in a steel plant, in particular to a method for treating steel plant zinc-containing smoke dust through a wet process. According to the method, the steel plant zinc-containing smoke dust is leached through a compounding ingredient aqueous solution with glycine ions Gly<-> as ligand under weak-base conditions, during a leaching process, iron, carbon, calcium, magnesium and silicon are not dissolved and stay in leaching slag, and lead and cadmium enter leaching liquid with zinc; and the leaching slag is returned to a steel system for compounding sintering after water washing, the leaching liquid can be returned to the leaching process to be used after being subjected to sulfide precipitation, and obtained sulfide slag is zinc sulfide concentrate. According the invention, the process is short, and the operation is simple; a leaching system is mild, requirements for corrosion prevention of equipment are low, and less toxic and side effects on human bodies and the environment are realized; ultralow zinc grade zinc-containing smoke dust with high iron content can be treated to realize deep separation of iron and zinc; and toxic heavy-metal elements Zn, Pb and Cd in the steel plant zinc-containing smoke dust can be effectively removed.

Description

technical field [0001] The invention relates to the field of comprehensive utilization of solid waste resources in iron and steel plants, in particular to a method for wet treatment of zinc-containing smoke and dust in iron and steel plants. Background technique [0002] Zinc in zinc-containing iron ore, waste galvanized steel and other zinc-containing raw materials is reduced and volatilized together with iron during the iron and steel smelting process, and the formed zinc vapor is oxidized to oxidized zinc in the rising process and enters the iron and steel dust collection Generally, those collected by wet methods are called mud, such as blast furnace gas mud, converter mud, etc., and those collected by dry methods are called dust, such as blast furnace soot, electric furnace soot, converter soot, etc., and the dried dust and mud are collectively referred to as containing Zinc fume; in the iron and steel system, the output of soot is 1% to 2% of the steel output; Chin...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B7/02C22B19/30
CPCY02P10/20
Inventor 窦爱春刘云建苏明如黄海芳李亚波吴晓东郭长庆王宏明霍向东李忠华
Owner JIANGSU UNIV
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