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Method for treating waste sludge in wiring board plant into resources

A circuit board factory and waste sludge technology, applied in sludge treatment, water/sludge/sewage treatment, sludge treatment through temperature control, etc., can solve the problems of high treatment cost, heavy pollution, waste of resources, etc., and achieve High recycling rate of resources, no secondary pollution and low treatment cost

Inactive Publication Date: 2005-09-21
HUIZHOU DAYAWAN HUILU ENVIRONMENT PROTECTION SERVICE +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The waste sludge produced by the printed circuit board industry is a kind of highly polluting industrial waste. Its composition is a mixture of hydroxide precipitation of copper and ferric iron. If it is not treated as a resource, it will inevitably cause environmental pollution and resource pollution. waste
At present, most domestic manufacturers engaged in the treatment of waste sludge from circuit board factories adopt two processes: fire method and wet method. The former method causes relatively large secondary pollution, and the resource utilization is not thorough.
The latter method is to completely dissolve the sludge with acid first, and then use step-by-step precipitation or extraction to separate copper and iron. If this process is to achieve better resource and harmless effects, it will cost more High processing costs, thus limiting economic benefits

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] The waste sludge of a circuit board factory has a copper content of 5% and a water content of 80%. The treatment process is as follows:

[0015] Step 1: Add water equal to the weight of the sludge into the sludge for pulping.

[0016] Step 2: Under the condition of sufficient stirring, heat the mud for activation, control the temperature at 90-100°C for 1 hour.

[0017] The third step: under the condition of sufficient stirring, control the temperature to 90-100° C., add 60% dilute sulfuric acid to dissolve, control the pH value to 1.5-2, and stir for 2 hours.

[0018] Step 4: Use a filter press for solid-liquid separation.

[0019] Step 5: Concentrate the liquid phase after solid-liquid separation, crystallize the crude copper sulfate, and then recrystallize to obtain the product copper sulfate.

[0020] Step 6: Rinse the solid phase after solid-liquid separation with water, and then add hydrochloric acid to generate ferric chloride. The generated ferric chloride ca...

Embodiment 2

[0023] The waste sludge of a circuit board factory has a copper content of 7% and a water content of 60%. The treatment process is as follows:

[0024] Step 1: Add water four times the weight of the sludge to the sludge for pulping.

[0025] Step 2: Under the condition of sufficient stirring, heat the mud for activation, control the temperature at 90-100°C for 2 hours.

[0026] The third step: under the condition of full stirring, control the temperature to 90-100° C., add 50% dilute sulfuric acid to dissolve, control the pH value to 1.5-2, and stir for 3 hours.

[0027] Step 4: Use a filter press for solid-liquid separation.

[0028] Step 5: Concentrate the liquid phase after solid-liquid separation, crystallize the crude copper sulfate, and then recrystallize to obtain the product copper sulfate.

[0029] Step 6: Rinse the solid phase after solid-liquid separation with water, and then add sulfuric acid to generate polyferric. The generated polyiron can be returned to the ...

Embodiment 3

[0032] The waste sludge of a circuit board factory has a copper content of 9% and a water content of 80%. The treatment process is as follows:

[0033] Step 1: Add water equal to the weight of the sludge into the sludge for pulping.

[0034] Step 2: Under the condition of sufficient stirring, heat the mud for activation, control the temperature at 90-100°C for 1 hour.

[0035] Step 3: under the condition of sufficient stirring, control the temperature to 90-100° C., add 40% dilute sulfuric acid to dissolve, control the pH value to 1.5-2, and stir for 2 hours.

[0036] Step 4: Use a filter press for solid-liquid separation.

[0037] Step 5: Concentrate the liquid phase after solid-liquid separation, crystallize the crude copper sulfate, and then recrystallize to obtain the product copper sulfate.

[0038] Step 6: Rinse the solid phase after solid-liquid separation with water, and then add hydrochloric acid to generate ferric chloride. The generated ferric chloride can be ret...

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Abstract

The invention provides a resources processing art for processing the waste sludge of wiring board factories, which belongs to environmental protection technical field and comprises the following steps: slurrying the sludge, heating to activate, dissolving with dilute sulphuric acid on the condition of controlling temperature and controlling PH and sufficient stirring to make the copper ion of the sludge dissolve and get into the liquid phase while the iron ion insolubilize and stay in the solid phase, then proceeding liquid-solid separation, concentration producing the liquid phase to get the crude copper sulfate and recrystallizing to get the copper sulfate, poaching the solid phase and adding hydrochloric acid or sulphuric acid to produce ferric chloride or polyferric sulfate used as a flocculant in the wiring board factory.

Description

technical field [0001] The invention relates to a resource treatment process of waste sludge from a circuit board factory, which can be used for the resource treatment of waste sludge from a circuit board factory, and belongs to environmental protection [0002] technology field. Background technique [0003] The waste sludge produced by the printed circuit board industry is a kind of highly polluting industrial waste. Its composition is a mixture of hydroxide precipitation of copper and ferric iron. If it is not treated as a resource, it will inevitably cause environmental pollution and resource pollution. waste. At present, most domestic manufacturers engaged in the treatment of waste sludge from circuit board factories adopt two processes: fire method and wet method. The former method causes relatively large secondary pollution, and the resource utilization is not thorough. The latter method is to completely dissolve the sludge with acid first, and then use step-by-step...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/62C02F11/00C02F11/18
Inventor 谢逢春
Owner HUIZHOU DAYAWAN HUILU ENVIRONMENT PROTECTION SERVICE
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