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Method for processing high-concentration chlorine-containing wastewater

A high-concentration, waste water technology, applied in chemical instruments and methods, water/sewage multi-stage treatment, water/sludge/sewage treatment, etc., can solve the problem of no recovery of metal zinc and hydrochloric acid, increased production cost of indium extraction, industrial waste water Deal with problems such as system troubles, achieve the effect of solving chloride ion balance and open circuit, good economic and environmental benefits

Inactive Publication Date: 2014-04-02
LAIBIN CHINA TIN SMELTING
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  • Abstract
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Problems solved by technology

[0002] At present, the production process for extracting zinc indium from high-indium and high-iron zinc concentrates produces a replacement solution containing 200g / L of zinc, 5g / L of iron, and 225g / L of chlorine, and 180g / L of hydrochloric acid and 15g / L of iron. L of molten iron is directly discharged to the waste water treatment station for neutralization with lime according to ordinary waste water. Metal zinc and hydrochloric acid are not recovered, which causes great troubles to the industrial waste water treatment system. It not only causes the loss of zinc metal, but also increases the production cost of indium extraction. At the same time, it leads to the high concentration of chloride ions in industrial wastewater and cannot be returned to the production post for recycling

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  • Method for processing high-concentration chlorine-containing wastewater

Examples

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no. 1 example

[0017] This embodiment is the first example of the method for treating high-concentration chlorine-containing wastewater according to the present invention, comprising the following steps:

[0018] (1) Dosing: 10m of replacement solution containing 200g / L zinc, 5g / L iron and 225g / L chlorine 3 And 10m of molten iron containing 180g / L hydrochloric acid and 15g / L iron 3 , in a volume of 30m 3 The mixing tank is mixed and prepared to obtain 20m of zinc chloride acidic mixture containing 100g / L of zinc, 2.5g / L of iron and 90g / L of hydrochloric acid. 3 ;

[0019] (2) Neutralization of zinc precipitation: at a reaction temperature of 60°C, at 20m 3 Add lime 4450 kg and hydrogen peroxide 0.76m in the mixed solution 3 Carry out zinc precipitation, zinc precipitation reaction is 3 hours, then filter, obtain 43% of water content, 6.8 tons of wet state zinc precipitation slag containing 51% of zinc and filtrate 17.2m 3 ;

[0020] (3) Zinc slag washing: at room temperature, wash the ...

no. 2 example

[0024] This embodiment is the second example of the method for treating high-concentration chlorine-containing wastewater according to the present invention, comprising the following steps:

[0025] (1) Dosing: 12m of replacement solution containing 200g / L zinc, 5g / L iron and 225g / L chlorine 3 And 10m of molten iron containing 180g / L hydrochloric acid and 15g / L iron 3 , in a volume of 30m 3 The mixing tank is mixed and prepared to obtain 22m of zinc chloride acidic mixed solution containing 109g / L of zinc, 2.7g / L of iron and 82g / L of hydrochloric acid. 3 ;

[0026] (2) Neutralizing zinc precipitation: under the condition of reaction temperature of 65°C, at 22m 3 Add 5075 kg of lime and 0.86m of hydrogen peroxide to the mixed solution 3 Carry out zinc precipitation, zinc precipitation reaction is 3 hours, then filter to obtain 8.7 tons of wet state zinc precipitation slag with 45% water content and 50% zinc content and 18.8m of filtrate 3 ;

[0027] (3) Zinc slag washing:...

no. 3 example

[0031] This embodiment is a third example of a method for treating high-concentration chlorine-containing wastewater according to the present invention, including the following steps:

[0032] (1) Dosing: 15m of replacement solution containing 200g / L zinc, 5g / L iron and 225g / L chlorine 3 And 10m of molten iron containing 180g / L hydrochloric acid and 15g / L iron 3 , in a volume of 30m 3 The mixing tank is used for mixing and dosing to obtain 25m of zinc chloride acidic mixed solution containing 120g / L of zinc, 3g / L of iron and 72g / L of hydrochloric acid 3 ;

[0033] (2) Neutralizing zinc precipitation: under the condition of reaction temperature 70℃, at 25m 3 Add 5870 kg of lime and 1.0m of hydrogen peroxide to the mixture 3 Carry out zinc precipitation, zinc precipitation reaction is 3 hours, filter then, obtain the wet state zinc precipitation slag 10.9 tons of water content 44%, zinc content 49% and filtrate 20.9m 3 ;

[0034] (3) Zinc slag washing: at room temperature,...

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Abstract

The invention discloses a method for processing a high-concentration chlorine-containing wastewater. The method comprises the following steps: carrying out zinc neutralization and precipitation at 60-70 DEG C by using lime after preparation of liquid, and filtering after reacting, so as to obtain a zinc precipitate slag and filtrate; recovering metal zinc after washing the zinc precipitate slag; adding lime to the filtrate to neutralize until the pH is 8.5-9.0; standing for 24 hours to remove impurities such as arsenic, iron, lead, magnesium and the like; carrying out evaporating concentration and crystallization on the liquid after impurities are removed, so as obtain an industrial anhydrous calcium chloride product. Zinc and indium metals in the high-concentration chlorine-containing wastewater can be recovered by adopting the method, and a chlorine element in the wastewater is converted into a calcium chloride product, so that innocent treatment of the chlorine-containing wastewater is achieved, the problem of environment protection is solved, and economic benefits are achieved.

Description

technical field [0001] The invention relates to the technical field of nonferrous metal smelting, in particular to a method for treating high-concentration chlorine-containing wastewater. Background technique [0002] At present, the production process for extracting zinc indium from high-indium and high-iron zinc concentrates produces a replacement solution containing 200g / L of zinc, 5g / L of iron, and 225g / L of chlorine, and 180g / L of hydrochloric acid and 15g / L of iron. L of molten iron is directly discharged to the waste water treatment station for neutralization with lime according to ordinary waste water. Metal zinc and hydrochloric acid are not recovered, which causes great troubles to the industrial waste water treatment system. It not only causes the loss of zinc metal, but also increases the production cost of indium extraction. At the same time, it leads to the high concentration of chloride ions in industrial wastewater and cannot be returned to the production pos...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B7/00C22B19/00C02F9/04C01F11/28
CPCY02P10/20
Inventor 陈光耀邹魁李显华刘俊兰潘久华
Owner LAIBIN CHINA TIN SMELTING
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