Treatment method of high-fluorine-chlorine secondary zinc oxide slag

A treatment method and high fluorine and chlorine times technology, applied in the direction of zinc sulfate, process efficiency improvement, instruments, etc., can solve the problems of difficult operation, complicated procedures, and too much soda ash.

Active Publication Date: 2021-05-11
湖南中金岭南康盟环保科技有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, because alkaline washing consumes more expensive soda ash, and the removal efficiency of simple washing has not yet reached the standard for making the electrolyte qualified, it needs to be combined with subsequent processes, often with complicated procedures and difficult operation

Method used

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  • Treatment method of high-fluorine-chlorine secondary zinc oxide slag
  • Treatment method of high-fluorine-chlorine secondary zinc oxide slag

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0051] The composition of high-fluorine chlorine suboxide zinc oxide waste residue is as follows:

[0052] The mass fraction of Zn is 58%, the mass fraction of O is 26%, the mass fraction of Pb is 0.017%, the mass fraction of F is 0.68%, the mass fraction of Cl is 0.36%, and the mass fraction of S is 7.5%.

[0053] The composition of zinc electrolytic waste liquid is as follows:

[0054] The zinc concentration is 160g / L, the sulfate radical concentration is 240g / L, the fluoride ion concentration is 20mg / L, and the chloride ion concentration is 20mg / L.

[0055] S1. Mix 40g of secondary zinc oxide waste residue and 80mL of tap water according to the solid-to-liquid ratio of 1:2, wash for 1 hour, and filter to obtain 57.1mL of washing residue and 62.9mL of washing water.

[0056] After testing, the fluoride ion concentration in the washing water was 550 mg / L, and the chloride ion concentration was 1215 mg / L.

[0057] S2. Mix 57.1mL of slag washing, 400mL of zinc electrolysis wa...

Embodiment 2

[0066] The composition of high-fluorine chlorine suboxide zinc oxide waste residue is as follows:

[0067] The mass fraction of Zn is 58%, the mass fraction of O is 26%, the mass fraction of Pb is 0.017%, the mass fraction of F is 0.68%, the mass fraction of Cl is 0.36%, and the mass fraction of S is 7.5%.

[0068] The composition of zinc electrolytic waste liquid is as follows:

[0069] The zinc concentration is 155g / L, the sulfate radical concentration is 230g / L, the fluoride ion concentration is 20mg / L, and the chloride ion concentration is 20mg / L.

[0070] S1. Mix 40g of secondary zinc oxide waste residue and 400mL of tap water according to the solid-to-liquid ratio of 1:10, wash for 1 hour, and filter to obtain 56mL of washing residue and 384mL of washing water.

[0071] After testing, the fluoride ion concentration of the washing water is 378 mg / L, and the chloride ion concentration is 552 mg / L.

[0072] S2. Mix 56mL of slag washing, 400mL of zinc electrolysis waste li...

Embodiment 3

[0081] The composition of high-fluorine chlorine suboxide zinc oxide waste residue is as follows:

[0082] The mass fraction of Zn is 58%, the mass fraction of O is 26%, the mass fraction of Pb is 0.017%, the mass fraction of F is 0.68%, the mass fraction of Cl is 0.36%, and the mass fraction of S is 7.5%.

[0083] The composition of zinc electrolytic waste liquid is as follows:

[0084] The zinc concentration is 160g / L, the sulfate radical concentration is 240g / L, the fluoride ion concentration is 20mg / L, and the chloride ion concentration is 20mg / L.

[0085] S1. Mix 20g of secondary zinc oxide waste residue and 40mL of tap water according to the solid-to-liquid ratio of 1:2, wash for 1 hour, and filter to obtain 28.6mL of washing residue and 31.4mL of washing water.

[0086] After testing, the fluoride ion concentration of the mixed washing water was 552 mg / L, and the chloride ion concentration was 1203 mg / L.

[0087] S2. Mix 28.6mL washing residue, 400mL zinc electrolysis...

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Abstract

The invention provides a treatment method of high-fluorine-chlorine secondary zinc oxide slag. The treatment method comprises the following steps: S1) washing the high-fluorine-chlorine secondary zinc oxide slag with water to obtain washing slag and washing water; S2) mixing and stirring the washing slag, zinc electrolysis waste liquid and a sulfuric acid-containing solution, and filtering to obtain a zinc sulfate-containing solution and slag; and S3) performing cooling crystallization on the zinc sulfate-containing solution to obtain zinc sulfate and crystallization mother liquor. Compared with the prior art, the treatment method has the advantages that the secondary zinc oxide waste slag is washed with water, fluorine and chlorine in part of secondary zinc oxide can be removed in advance, and a foundation is laid for fluorine and chlorine purity control of subsequent zinc sulfate crystallization; then the washing slag of secondary zinc oxide, which is obtained after washing, the zinc electrolysis waste liquid and the sulfuric acid-containing solution are mixed and stirred, and the temperature is controlled to improve the saturation of zinc sulfate in the solution, thereby laying a foundation for subsequent induced crystallization and precipitation of zinc sulfate; and finally, zinc sulfate crystals generated through cooling induced crystallization are coarse in particle and high in purity, only a small amount of fluorine and chlorine are adsorbed on the surfaces of the crystals, and the recycling quality requirement can be met.

Description

technical field [0001] The invention belongs to the technical field of heavy metal smelting, and in particular relates to a treatment method for high-fluorine chlorine suboxide zinc oxide slag. Background technique [0002] my country is a big country in zinc smelting, and wet (electrolytic method) zinc smelting is one of the main smelting methods. A large amount of sub-zinc oxide waste slag will be produced in the process of electrolytic zinc smelting. The sub-zinc oxide waste slag contains heavy metals such as Pb and Zn, as well as non-metals such as F, Cl and S, and the process of hydrometallurgy will also produce secondary zinc oxide waste. Zinc electrolytic waste liquid with similar components to zinc waste residue and dirty acid containing a large amount of sulfuric acid. [0003] Secondary zinc oxide waste slag contains a large amount of zinc elements. Recycling can not only reduce the waste of zinc, but also benefit environmental protection. How to deal with the flu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B7/04C22B19/30C22B3/08C22B3/22C22B1/00C01G9/06C25C1/16
CPCC22B7/007C22B7/04C22B19/22C22B19/30C22B3/22C22B1/005C01G9/06C25C1/16Y02P10/20
Inventor 周惠余承红周康根吴班姜科高峰胡舜聪潘希贤彭佳乐张剑峰
Owner 湖南中金岭南康盟环保科技有限公司
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