Method for selectively recovering heavy metals in electroplating sludge by using chlorination roasting approach

A technology of electroplating sludge and chlorination roasting, which is applied in the direction of improving process efficiency, can solve the problems of long electrolysis time, inability to judge the recovery rate of electroplating sludge, and large heat energy, so as to improve separation efficiency and recovery efficiency, and is beneficial to The effect of resource utilization, high environmental and economic benefits

Inactive Publication Date: 2019-01-29
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] Chinese patent "treatment method of electroplating sludge" (CN201810278358.9) Add compound additives to electroplating sludge, stir under ultraviolet light, then add coke powder, mix well, press filter, crush and dry the mud cake , placed at a temperature of 1100-1200°C for smelting treatment, the exhaust gas produced by smelting is purified and discharged, and the smelted materials are refined and separated to obtain molten slag and metal alloys; but this method requires Consumes a lot of heat energy, and the process is complicated
The Chinese patent "A Method for Recovering Copper and Nickel from Electroplating Sludge" (CN201710900663.2) uses ammonia method and solvent extraction method to recover heavy metal copper and nickel in electroplating sludge. The process is relatively complicated, and Less than 90% copper recovery and less than 10% nickel recovery
The Chinese patent "A Method for Separately Recovering Copper, Nickel, and Zinc from Electroplating Sludge" (C...

Method used

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Examples

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Effect test

Embodiment 1

[0021] A method for selectively recovering heavy metals in electroplating sludge by a chlorination roasting method of the present embodiment, the specific steps are as follows:

[0022] (1) Mix and stir 2g of electroplating sludge with 1.6mL of hydrochloric acid, and then place it in a tube furnace under nitrogen atmosphere for calcination at 200 °C for 2h. During the calcination process, the volatilized chromium chloride is collected by the tail gas and absorbed with water to obtain chloride Chromium solution;

[0023] (2) the solid material in the step (1) is naturally cooled to room temperature and then ground and sieved, and then according to the solid-liquid ratio of 1:5, distilled water is added to the fine powder after the sieve, and after 15 minutes of shaking on a shaking table, centrifugation, filtering , repeat the above operation twice to obtain the mixed solution and solid sludge containing nickel and copper metal chlorides.

[0024] In this example, the recoveri...

Embodiment 2

[0026] A method for selectively recovering heavy metals in electroplating sludge by a chlorination roasting method of the present embodiment, the specific steps are as follows:

[0027] (1) Take 2g of electroplating sludge and mix and stir with 2mL of hydrochloric acid, and then put it in a tube furnace for calcination at 300°C for 2h under nitrogen atmosphere. During the calcination process, the volatilized chromium chloride is collected by the exhaust gas collection device and absorbed with water to obtain Chromium chloride solution;

[0028] (2) the solid material in the step (1) is naturally cooled to room temperature and then ground and sieved, and then according to the solid-liquid ratio of 1:5, distilled water is added to the fine powder after the sieve, and after 15 minutes of shaking on a shaking table, centrifugation, filtering , repeat the above operation twice to obtain the mixed solution and solid sludge containing nickel and copper metal chlorides.

[0029] In t...

Embodiment 3

[0031] A method for selectively recovering heavy metals in electroplating sludge by a chlorination roasting method of the present embodiment, the specific steps are as follows:

[0032] (1) Mix and stir 2g of electroplating sludge with 2mL of hydrochloric acid, 2g of ammonium chloride, and 2g of calcium chloride, respectively, and then put it in a tube furnace under nitrogen atmosphere for calcination at 200 °C for 2h. Volatile chromium chloride is collected and absorbed with water to obtain a chromium chloride solution;

[0033] (2) the solid material in the step (1) is naturally cooled to room temperature and then ground and sieved, and then according to the solid-liquid ratio of 1:5, distilled water is added to the fine powder after the sieve, and after 15 minutes of shaking on a shaking table, centrifugation, filtering , repeat the above operation twice to obtain the mixed solution and solid sludge containing nickel and copper metal chlorides.

[0034] In the present embo...

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Abstract

The invention belongs to the technical field of solid waste treatment and discloses a method for selectively recovering heavy metals in electroplating sludge by using a chlorination roasting approach.The method comprises the followings steps that the electroplating sludge and a chlorinating agent are mixed and then roasted at 159-400 DEG C, volatile chromium chloride is collected through tail gasand absorbed by water to obtain a chromium chloride solution, water is added to dissolve residual solid materials, and solid-solution separation is carried out to obtain a metal chloride mixed solution and solid sludge slag. According to the method, the electroplating sludge is treated in combination with a chlorination roasting technology in industrial metallurgy, through using hydrochloric acidas the chlorinating agent, the recovery rate of chromium in the electroplating sludge can reach more than 85% or above, the recovery rate of nickel and the recovery rate of copper can reach more than90% or above, the process is simple, the recovery effect is good, and the method has relatively high environment and economic benefits, and is beneficial to resource utilization of the electroplatingsludge.

Description

technical field [0001] The invention belongs to the technical field of solid waste treatment, and in particular relates to a method for selectively recovering heavy metals in electroplating sludge by a chlorination roasting method. Background technique [0002] Electroplating sludge is a toxic and harmful hazardous solid waste produced in the production process of the electroplating industry, including the sludge produced by the dissolution of anodes in the electrolytic cell, the sludge obtained by filtration, and the sludge produced when the chemical-precipitation method is used to treat wastewater. The content of nickel, copper, chromium, zinc and other metals in electroplating sludge is very high, so it is very necessary to recover valuable metals from electroplating sludge. At present, the treatment method of electroplating sludge is inappropriate, and it is discarded in the open field. Because the physical and chemical properties of these sediments are not very stable,...

Claims

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Application Information

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IPC IPC(8): C22B7/00C22B1/08C22B15/00C22B23/00C22B34/32
CPCC22B1/08C22B7/001C22B7/006C22B15/0026C22B15/0082C22B23/02C22B23/0407C22B34/32Y02P10/20
Inventor 林璋刘学明宿新泰黄秋云周晋
Owner SOUTH CHINA UNIV OF TECH
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