Process for leaching and separating metal components in heavy metal sludge by ultrasonic activation

A technology of heavy metal sludge and metal components, which is applied in the direction of improving process efficiency, can solve the problems of economic and social benefit limitations, incomplete resource utilization, and large secondary pollution, so as to avoid secondary pollution and resource pollution. High recycling rate and low disposal cost

Inactive Publication Date: 2008-08-20
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The former method causes relatively large secondary pollution, and resource utilization is not complete
The latter method is to completely dissolve the sludge with acid first, and then separate it by ammonia leaching or step-by-step precipitation or extraction. If this process is to achieve better resource and harmless effects, it will cost Higher treatment costs, and also prone to secondary pollution, so its economic and social benefits are limited

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Waste sludge from a circuit board factory contains 4% copper, 5% iron, 1% tin and 70% water. Its treatment process is as follows:

[0018] 1. First put the sludge into the pulping tank and add water to make the total water content reach 90%, fully stir for half an hour, and then pump it into the leaching tank with a thick slurry pump to obtain a fully mixed solid-liquid slurry.

[0019] 2. The audio frequency is 20kHz and the power is 2.5kw / m 3 Under the condition of ultrasonic radiation, fully stir, gradually add 40-60% dilute sulfuric acid to dissolve, control the pH value to 1.5-2, and the reaction time is 2-3 hours.

[0020] 3. Use a filter press for solid-liquid separation.

[0021] 4. Concentrate the liquid phase after the solid-liquid separation, crystallize the crude copper sulfate, and then recrystallize to obtain the product copper sulfate.

[0022] 5. The solid phase after solid-liquid separation is operated at an audio frequency of 20kHz and a power of 1....

Embodiment 2

[0027] Waste sludge from an electroplating factory contains 2.1% nickel, 1.5% copper, 1.4% zinc, 2.5% iron, 3.0% chromium and 60% water. Its treatment process is as follows:

[0028] 1. First put the sludge into the pulping kettle and add water to make the total water content reach 90%, fully stir for 1 hour, and then pump it into the leaching kettle with a thick slurry pump to obtain a fully mixed solid-liquid slurry.

[0029] 2. The audio frequency is 20kHz and the power is 2.5kw / m 3 Under the conditions of ultrasonic radiation, fully stir, gradually add 40-60% dilute sulfuric acid to dissolve, control the pH value to 3-3.5, and the reaction time is 2-3 hours, nickel and zinc ions are dissolved in the liquid phase, copper, chromium ( trivalent), iron (trivalent) remains in the solid phase.

[0030] 3. Use a filter press for solid-liquid separation.

[0031] 4. The liquid phase after solid-liquid separation is separated and purified by three-phase extraction, and concentra...

Embodiment 3

[0039] The leaching slag from a wet zinc smelting plant contains 11% zinc, 16% iron and 40% water. Its treatment process is as follows:

[0040] 1. First add the leaching slag to the pulping kettle and add water to make the total water content reach 90%, fully stir for 50 minutes, then pump it into the leaching kettle with a thick slurry pump to obtain a fully mixed solid-liquid slurry.

[0041] 2. The audio frequency is 20kHz and the power is 2.5kw / m 3 Under the conditions of ultrasonic radiation, fully stir, gradually add 40-60% dilute sulfuric acid to dissolve, control the pH value to 3-3.5, and the reaction time is 2-3 hours, zinc ions dissolve in the liquid phase, iron (trivalent) stays in solid phase.

[0042] 3. Use a filter press for solid-liquid separation.

[0043] 4. After the liquid phase after solid-liquid separation is passed through sulfide to precipitate copper and lead, then adjust the pH value to 4.5 and enter hydrogen peroxide to completely precipitate ir...

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PUM

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Abstract

The invention discloses an immersing and separating method of each metal component in the heavy metal sludge activated by ultrasound in the environmental protective technical domain, which comprises the following steps: adding water in the sludge to make water content at 90%; stirring 0.5-1h; pulping pumped by dense-slurry pump; stirring completely under ultrasound; adding 20-40% diluted acid; controlling different terminating point pH values to immerse acid step by step; making different metal component in the sludge into immersing liquid with different pH values; realizing separation and initial separation; purifying through normal standard method; condensing to obtain different metal salt productions.

Description

technical field [0001] The invention belongs to the technical field of environmental protection, and relates to a method for separating different metal components in heavy metal sludge, in particular to a method for ultrasonically activating leaching and separating metal components in heavy metal sludge, and the method can be used for resource treatment of heavy metal sludge. Background technique [0002] Heavy metal sludge is a kind of sludge produced by wastewater treatment in some industrial enterprises. It is a kind of highly polluting industrial waste. Its composition is a mixture of various heavy metal hydroxide precipitation or carbonate precipitation. If it is not resourced Chemical treatment will inevitably cause environmental pollution and waste of resources. At present, most domestic manufacturers engaged in the treatment of heavy metal sludge adopt two processes: fire method and wet method. The former method causes relatively large secondary pollution, and the r...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B3/00C22B3/06C22B3/22
CPCY02P10/20
Inventor 谢逢春
Owner SOUTH CHINA UNIV OF TECH
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