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Hydro-thermal treatment method for electroplating sludge

A technology of electroplating sludge and hydrothermal treatment, applied in sludge treatment, water/sludge/sewage treatment, metallurgical wastewater treatment, etc., can solve problems such as human body and ecological environment impact, secondary pollution, easy loss, etc. The effect of reducing the rate, reducing the moisture content, and reducing the dissolution rate

Inactive Publication Date: 2013-04-03
SHANGHAI JIXIANG ENVIRONMENTAL PROTECTION TECH DEV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the biggest disadvantage of the chemical method is that it will produce a large amount of heavy metal sludge, which contains harmful heavy metals that are difficult to degrade. It has the characteristics of easy accumulation, instability, and easy loss. Serious secondary pollution, affecting human body and ecological environment

Method used

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  • Hydro-thermal treatment method for electroplating sludge
  • Hydro-thermal treatment method for electroplating sludge
  • Hydro-thermal treatment method for electroplating sludge

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] After the sludge truck is unloaded, put it into the tempering tank, add about 0.2 times the volume of aqueous solution to dilute it, and when it is in a fluid state, it is transported to the feed hopper by a screw conveyor, and then pumped into the sludge produced by Weihai Xintai Chemical Equipment Factory through a high-pressure feed pump. GSHA-1 permanent magnet rotary stirring autoclave, stop feeding after reaching a fixed capacity. Turn on the heating device of the GSHA-1 permanent magnet rotary stirring autoclave produced by Weihai Xintai Chemical Equipment Factory, heat and increase the pressure to 5.33MPa and 232°C, that is, open the GSHA-1 permanent magnet rotary autoclave produced by Weihai Xintai Chemical Equipment Factory The upper discharge valve of the stirring autoclave enters the residence tank, and the residence time is about 8 minutes. The lower discharge valve is opened to discharge the sludge to the storage tank by pressure pulse, and the discharged h...

Embodiment 2

[0035] After the sludge truck is unloaded, put it into the tempering tank, add about 0.2 times the volume of aqueous solution to dilute it, and when it is in a fluid state, it is transported to the feed hopper by a screw conveyor, and then pumped into the sludge produced by Weihai Xintai Chemical Equipment Factory through a high-pressure feed pump. GSHA-1 permanent magnet rotary stirring autoclave, stop feeding after reaching a fixed capacity. Turn on the heating device of the GSHA-1 permanent magnet rotary stirring autoclave produced by Weihai Xintai Chemical Equipment Factory, heat and increase the pressure to 7.67MPa and 241°C, that is, open the GSHA-1 permanent magnet rotary autoclave produced by Weihai Xintai Chemical Equipment Factory The upper discharge valve of the stirring autoclave enters the residence tank, and the residence time is about 8 minutes. The lower discharge valve is opened to discharge the sludge to the storage tank by pressure pulse, and the discharged h...

Embodiment 3

[0041] After the sludge truck is unloaded, put it into the tempering tank, add about 0.2 times the volume of aqueous solution to dilute it, and when it is in a fluid state, it is transported to the feed hopper by a screw conveyor, and then pumped into the sludge produced by Weihai Xintai Chemical Equipment Factory through a high-pressure feed pump. GSHA-1 permanent magnet rotary stirring autoclave, stop feeding after reaching a fixed capacity. Turn on the heating device of the GSHA-1 permanent magnet rotary stirring autoclave produced by Weihai Xintai Chemical Equipment Factory, heat and increase the pressure to 7.98MPa and 256°C, that is, open the GSHA-1 permanent magnet rotary autoclave produced by Weihai Xintai Chemical Equipment Factory The upper discharge valve of the stirring autoclave enters the residence tank, and the residence time is about 8 minutes. The lower discharge valve is opened to discharge the sludge to the storage tank by pressure pulse, and the discharged h...

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Abstract

The invention discloses a hydro-thermal treatment method for electroplating sludge, which comprises the following steps of: firstly mixing electroplating sludge with water so as to form electroplating sludge fluid; feeding the electroplating sludge fluid into a continuous high-temperature and high-pressure reaction kettle, and after a fixed volume is achieved, stopping feeding; raising the internal temperature of the kettle so as to carry out hydro-thermal treatment; after the hydro-thermal treatment is completed, discharging heavy metal sludge hydro-thermal residues subjected to reaction, and carrying out filter pressing on the discharged heavy metal sludge hydro-thermal residues so as to obtain solid-phase hydro-thermal residues and liquid-phase hydro-thermal water; carrying out immersion cleaning on the solid-phase hydro-thermal residues by using a sulfuric acid and carrying out filter pressing on the solid-phase hydro-thermal residues so as to obtain acid-washing liquor and hydro-thermal residue precipitates, and drying and grinding the hydro-thermal residue precipitates subjected to each acid-washing process; and uniformly mixing the acid-washing liquor and the liquid-phase hydro-thermal water obtained each time, and then preparing ferrite by using a chemical co-precipitation method. According to the hydro-thermal treatment method disclosed by the invention, the leaching of heavy metals can be efficiently realized, and the heavy metals can be subjected to effective separation and recycling by taking subsequent separation measures. The moisture content of sludge can be greatly reduced through a plate-and-frame filter press, so that the volume of the sludge residues is reduced, the heavy metal dissolution rate of the residues is greatly reduced, and the form is more stable.

Description

technical field [0001] The invention relates to the technical fields of industrial waste liquid treatment, resource recycling, environmental protection and energy saving, and in particular to a hydrothermal treatment method for electroplating sludge. Background technique [0002] Sludge is the solid sedimentation material produced by the sewage treatment process. Among the hazards of solid waste pollution, the most serious is the pollution of hazardous waste, so the focus of solid waste treatment is the treatment of hazardous solid waste, and heavy metal-containing water treatment sludge is a type of hazardous solid waste. Electroplating sludge is the "final state" of wastewater treatment in the electroplating industry, which contains a large amount of precious metals such as copper, nickel, chromium, iron, and zinc. Electroplating sludge mainly comes from the solid waste produced by various electroplating waste liquids and electrolytic bath liquids in industrial electropla...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F11/00C02F11/10C02F103/16
Inventor 夏前勇申哲民刘诚晨
Owner SHANGHAI JIXIANG ENVIRONMENTAL PROTECTION TECH DEV
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