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A method for firing bricks using solid slag produced by treating electroplating wastewater

A technology of electroplating wastewater and treatment agent, which is applied in the field of industrial solid waste treatment, can solve the problems of land occupation, high energy consumption, secondary pollution of the environment, and secondary pollution of the environment, so as to reduce treatment costs, save energy, and avoid secondary pollution. The effect of the investment

Active Publication Date: 2016-05-25
漆雅丽
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The current solution is one is to landfill, which not only occupies the land, but also pollutes the land, which will harm future generations; the other is to dry the cement, but the water must be dried thoroughly, which consumes a lot of energy, making the disposal cost high, and it is also easy to cause secondary pollution. secondary polluted environment
The problems of occupying land, consuming large amounts of energy, and easily causing secondary pollution to the environment need to be resolved urgently

Method used

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  • A method for firing bricks using solid slag produced by treating electroplating wastewater

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Embodiment 1

[0022] A method of using physicochemical method to treat solid slag produced by electroplating wastewater to make bricks. The electroplating wastewater first enters the adjustment tank for adjustment; then enters the reduction tank for reduction reaction. Under the condition of PH value ≤ 3, add 0.5kg / m 3 Sodium metabisulfite, react for about 20 minutes to completely reduce hexavalent chromium to trivalent chromium; then enter the neutralization tank for neutralization reaction, and add 1.0kg / m 3 QS electroplating wastewater treatment agent and 0.02kg / m 3 Amide, make the pH value reach 8, and react for about 20 minutes; then enter the sedimentation tank for precipitation separation, the supernatant is discharged up to the standard, and the precipitate is filtered by a plate and frame filter press to obtain a solid residue. The solid slag with a moisture content of 77.40% is mixed with 55% of shale, 28% of coal gangue, and 5% of raw coal at a dosage of 12%, stirred and mixed, extru...

Embodiment 2

[0029] A method of using physicochemical method to treat the solid slag produced by electroplating wastewater to make bricks. The electroplating wastewater first enters the adjustment tank for adjustment; then enters the reduction tank for reduction reaction. Under the condition of PH value ≤ 3, add 0.3kg / m 3 Sodium metabisulfite, react for about 20 minutes to completely reduce hexavalent chromium to trivalent chromium; then enter the neutralization tank for neutralization reaction, and add 1.5kg / m 3 QS electroplating wastewater treatment agent and 0.03kg / m 3 Amide, make the pH value reach 8, and react for about 20 minutes; then enter the sedimentation tank for precipitation separation, the supernatant is discharged up to the standard, and the precipitate is filtered by a plate and frame filter press to obtain a solid residue. The solid slag with 80% moisture content was mixed with 50% shale, 30% coal gangue, and 5% raw coal at a dosage of 15%, stirred and mixed, extruded, and dri...

Embodiment 3

[0036] A method of using physicochemical method to treat the solid slag produced by electroplating wastewater to make bricks. The electroplating wastewater first enters the adjustment tank for adjustment; then enters the reduction tank for reduction reaction. Under the condition of PH value ≤ 3, add 0.7kg / m 3 Sodium metabisulfite, react for about 20 minutes to completely reduce hexavalent chromium to trivalent chromium; then enter the neutralization tank for neutralization reaction, and add 2.0kg / m 3 QS electroplating wastewater treatment agent and 0.03kg / m 3 Amide, make the pH value reach 8, and react for about 20 minutes; then enter the sedimentation tank for precipitation separation, the supernatant is discharged up to the standard, and the precipitate is filtered by a plate and frame filter press to obtain a solid residue. The solid slag with a moisture content of 70% is mixed with 55% of shale, 30% of coal gangue, and 5% of raw coal in an amount of 10%, stirred and mixed, ext...

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Abstract

The invention provides a method for firing bricks by utilizing the solid slag produced by treating electroplating wastewater, which is characterized in that: the treatment of electroplating wastewater adopts a physical and chemical method, and then the solid slag with a water content of 70-80% produced by the treatment of electroplating wastewater is processed according to 10 ~15% dosage is mixed with raw materials for firing bricks and fired into finished bricks. The invention organically combines the solid slag produced by treating electroplating wastewater with the brick firing process. On the one hand, the treated electroplating wastewater supernatant can be discharged stably for a long time, and the compliance rate is above 99.9%. On the other hand, the solid slag is used to produce The fired bricks fully meet the quality requirements of finished bricks, and can also fully meet and be superior to the relevant national environmental protection indicators for the disposal of electroplating wastewater solid slag.

Description

technical field [0001] The invention belongs to the field of industrial solid waste treatment, and in particular relates to a method for producing fired bricks by utilizing solid slag produced after electroplating wastewater is treated. Background technique [0002] There are many, small and scattered electroplating factories in our country, and the production technology is backward. At present, it is the simplest and most effective method to treat electroplating wastewater by chemical precipitation, which is adopted by most electroplating factories, and the mud production rate is generally 3-8Kg / m 3 about. [0003] The purpose of electroplating wastewater treatment is to settle the heavy metals in the wastewater to meet the national GB21900-2008 electroplating pollutant discharge standard. When electroplating wastewater is treated with physical and chemical methods, a large amount of solid sediment (referred to as solid residue) will be produced. If these solid residues a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B30/00
Inventor 漆雅丽肖宇晗吴雨时漆丁源吴平益
Owner 漆雅丽