Processing method of casting zinc dross

A treatment method and technology for zinc scum, applied in the direction of improving process efficiency, can solve problems such as pollution of the environment, and achieve the effects of environmental protection and high zinc recovery rate

Inactive Publication Date: 2013-03-20
LAIBIN CHINA TIN SMELTING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The process is simple in operation, workers can go to work after simple training, and the recovery rate of zinc metal is high, reaching 99%. The disadvantage is that it produces washing wastewater and pollutes the environment.

Method used

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  • Processing method of casting zinc dross

Examples

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Effect test

no. 1 example

[0022] This embodiment is the first example of the method for processing zinc dross in the present invention, and includes the following steps:

[0023] (1) Lime water washing: Add 18 cubic meters of water into a 30 cubic meter washing tank, stir at 25°C, and add 6 tons of cast zinc scum with 70% zinc and 1.0% chlorine. Use 81 kilograms of slaked lime powder, adjust the end pH of the washing liquid to 9, wash for 10 minutes, and filter and separate to obtain 16.5 cubic meters of lime water washing filtrate with a chlorine content of 3.1 g / L and lime water with a chlorine content of 0.35%. 7.7 tons of wet residue.

[0024] (2) Tap water washing: In a 30 cubic meter washing tank, add 18 cubic meters of tap water, stir, add lime water to wash and filter 7.7 tons of wet residue, wash at a temperature of 25°C for 10 minutes, filter and separate to obtain The tap water with 0.12% chlorine washes and filters 7.7 tons of wet residue and 18 cubic meters of washing and filtration water; the...

no. 2 example

[0029] This embodiment is the second example of the method for processing zinc dross in the present invention, which includes the following steps:

[0030] (1) Lime water washing: Add 25 cubic meters of water to a 30 cubic meter washing tank, stir, and the temperature is 25°C. Add 6 tons of cast zinc scum with 78% zinc and 2.0% chlorine. Use 164 kg of slaked lime powder, adjust the end pH of the washing liquid to 10, wash for 20 minutes, and filter and separate to obtain 23.5 cubic meters of lime water washing filtrate with chlorine 5.0 g / l and lime water with 0.46% chlorine. Wet slag is 7.6 tons.

[0031] (2) Tap water washing: In a 30 cubic meter washing tank, add 25 cubic meters of tap water, stir, add lime water to wash the filtered wet residue 7.6 tons, wash at a temperature of 25 ℃ for 20 minutes, filter and separate to obtain The tap water with 0.11% chlorine washes and filters 7.6 tons of wet residue and 25 cubic meters of washing and filtration water; the washing and filt...

Embodiment 3

[0036] This embodiment is the second example of the method for processing zinc dross in the present invention, which includes the following steps:

[0037] (1) Lime water washing: Add 25 cubic meters of water into a 30 cubic meter washing tank, stir, and the temperature is 25°C. Add 5 tons of cast zinc scum with 85% zinc and 3.0% chlorine. Use 206 kg of slaked lime powder, adjust the end pH of the washing liquid to 11, wash for 30 minutes, and filter and separate to obtain 23.6 cubic meters of lime water washing filtrate with a chlorine content of 6.0 g / l and a lime water with 0.58% chlorine. Wet slag is 6.4 tons.

[0038] (2) Tap water washing: In a 30 cubic meter washing tank, add 25 cubic meters of tap water, stir, add lime water to wash and filter 6.4 tons of wet residue, wash at a temperature of 25°C for 30 minutes, filter and separate to obtain The tap water with 0.13% chlorine washes and filters 6.4 tons of wet residue and 25 cubic meters of washing and filtered water; the ...

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Abstract

The invention discloses a processing method of casting zinc dross. The processing method comprises the steps of adding water and the casting zinc dross into a washing trough when stirring at room temperature, adjusting the final pH value of washing liquid to 9-11 using hydrated lime powder, washing the casting zinc dross for 10-30 minutes, filtering to obtain filtrate and filtration residue, washing the filtration residue using tap water at room temperature and in the liquid-solid ratio of (3:1):(5:1) for 10-30 minutes, filtering to obtain the filtrate and filtration residue, returning the filtration residue to a zinc system to produce electrodeposited zinc, returning the filtrate to the lime water washing procedure, subjecting the lime water washed filtrate to electrodialysis concentration,subjecting the electrodialysis purified liquid to the separation treatment by means of reverse osmosis membrane technology, returning the reverse osmosis concentrated liquid to the electrodialysis procedure for processing, returning the reverse osmosis membrane purified liquid to the tap water washing procedure, and vaporizing and concentrating the electrodialysis concentrated liquid to produce the product of calcium chloride. By adopting the processing method provided by the invention, chlorine can be fast removed from the casting zinc dross, the metal zinc can be recycled, the product of calcium chloride can be simultaneously produced, and the whole process procedures do not produce waste water.

Description

Technical field [0001] The invention relates to the field of non-ferrous metal smelting, in particular to a method for processing zinc dross in a mold. Background technique [0002] Cast zinc dross is a scum with 70-85% zinc content and 1.0-3.0% chlorine content produced during the process of melting and casting zinc ingots from cathode zinc flakes; zinc mainly exists in the form of zinc oxide, a small part of which is metallic zinc and The main impurity element of zinc chloride and cast zinc scum is chlorine. Chlorine mainly exists in the form of zinc chloride. Other impurities such as iron, lead, arsenic, antimony, copper, cadmium, etc. are very low. According to the cast zinc float The chemical composition of the slag, if the mold scum can be dechlorinated, then the cast zinc scum after dechlorination is an ideal raw material for zinc smelting. [0003] At present, there are mainly the following treatment methods for casting zinc dross: [0004] 1. Dechlorination by multi-hearth...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B19/30
CPCY02P10/20
Inventor 陶政修王学洪蒋光佑韦晓岚廖柏俊韦开林
Owner LAIBIN CHINA TIN SMELTING
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