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Method for harmlessly treatment of waste paint slag

A technology of harmless treatment and waste paint, applied in the field of waste treatment, can solve the problems of low metal recovery rate, can not fully achieve classified treatment, etc., to achieve the effect of improving recovery rate and excellent production environment

Active Publication Date: 2021-06-25
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The traditional method of treating paint slag is to use low-temperature incineration or physical separation and recovery, which cannot fully achieve the purpose of classified treatment, and the metal recovery rate is low

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] A method for processing waste paint slag (containing 50% zinc and containing 0.5% magnesium oxide) method of the present invention, comprising the following steps:

[0026] (1) Slurry waste paint slag with washing water, and then leaching in PP leaching tank. The leaching conditions are: solid-liquid mass ratio 1:3, initial acidity: H + 160g / l, temperature 90°C, leaching reaction time 5 hours, filter after leaching to obtain leaching slag and zinc-containing solution with a zinc content of 120-130g / l; Production, casting and other conventional processes, the output of zinc products (products comply with GB / T470-2008).

[0027] (2) Put the leaching slag into the rotary kiln for high-temperature melting (reduction first and then oxidation), melting conditions: kiln head temperature 1100-1200°C, kiln tail temperature 400-800°C, rotary kiln length 38 meters, outer diameter 2.6 meters, The speed is 0.5 rev / min. The flue gas produced by the rotary kiln is desulfurized, coole...

Embodiment 2

[0030] A method for processing waste paint slag (containing 28% zinc, containing 8% magnesium oxide) method of the present invention, comprising the following steps:

[0031] (1) Put the waste paint slag into the rotary kiln for high-temperature smelting, first reduce it to zinc vapor, and then oxidize it to zinc oxide; the conditions for smelting in the waste paint slag rotary kiln: kiln head temperature 1100-1200 ℃, kiln tail temperature 400-500°C, the length of the rotary kiln is 38 meters, and the outer diameter is 2.6 meters. The flue gas generated by the rotary kiln is desulfurized, cooled, and bagged for dust purification. The secondary zinc oxide collected by the dust collector contains about 50% zinc; The kiln slag is sent to building materials factory or refractory material factory;

[0032] (2) Slurry, leaching, and filtering the collected secondary zinc oxide, send the leaching slag to the rotary kiln for further smelting, purify the zinc-containing solution, elect...

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PUM

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Abstract

The invention discloses a method for classified treatment and harmless treatment of waste paint slag. The method comprises the following steps: (1) carrying out slurrying and acid leaching on the waste paint slag containing not less than 40% of zinc and less than 1% of magnesium oxide to obtain leaching slag and a zinc-containing leaching solution, carrying out high-temperature smelting on the leaching slag in a rotary kiln, and producing an electric zinc product from the zinc-containing leaching solution; (2) directly feeding the paint slag with the zinc content being lower than 40% or / and the magnesium oxide content being not lower than 1% into a rotary kiln for high-temperature smelting, and producing an electric zinc product from a collected secondary zinc oxide product; and (3) carrying out slurrying and acid leaching on the waste paint slag with the zinc content not lower than 40% and the magnesium oxide content not lower than 1% to obtain leaching slag and zinc-containing leaching solution, producing the electric zinc product from the zinc-containing leaching solution, putting the waste paint slag with the zinc content not lower than 40% or / and the magnesium oxide not lower than 1% and the leaching slag into a rotary kiln together for high-temperature smelting, and producing the electric zinc product from collected secondary zinc oxide. According to the technology, various kinds of waste paint slag can be treated, the waste paint slag is treated in a classified mode, zinc is comprehensively recycled, and the recovery rate of metal zinc is effectively increased.

Description

technical field [0001] The invention belongs to the field of waste treatment, and in particular relates to a method for harmlessly treating waste paint slag and comprehensively recovering zinc at the same time. Background technique [0002] Waste paint slag is hazardous waste, containing zinc, carbon, organic matter, sulfur, magnesium oxide, silicon dioxide, calcium oxide, iron, moisture, etc., and must be safely collected, stored and disposed of in categories. The traditional treatment method of paint slag is low-temperature incineration or physical separation and recovery, which cannot fully achieve the purpose of classified treatment, and the metal recovery rate is low. Therefore, it is necessary to research and develop a process that can effectively treat waste paint slag, clean the production environment, and have a high metal recovery rate, so as to meet the actual needs of waste paint slag hazardous waste treatment. Contents of the invention [0003] The technical ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B7/00C22B19/20C22B19/38C04B7/28C04B18/10C04B35/66
CPCC22B7/007C22B19/22C22B19/38C04B7/28C04B18/10C04B35/66Y02W30/91Y02P10/20Y02P40/10
Inventor 郭学益李骕
Owner CENT SOUTH UNIV