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Wastewater treatment method for wet regeneration of mixed casting waste sand

A technology for waste foundry sand and wet regeneration, applied in water/sewage multi-stage treatment, water/sludge/sewage treatment, chemical instruments and methods, etc. The problem of high mud moisture content can reduce the moisture content, reduce the floor space and increase the settlement area.

Active Publication Date: 2016-01-20
广西兰科资源再生利用有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Treating a large amount of wastewater requires a large amount of space, resulting in high wastewater treatment costs, and the sludge obtained after wastewater treatment has a very high moisture content, which is likely to cause secondary pollution
If the problem of wastewater treatment is not solved, it will restrict the popularization and application of wet sand recycling waste sand technology, and the recycling of waste sand will be empty talk

Method used

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  • Wastewater treatment method for wet regeneration of mixed casting waste sand
  • Wastewater treatment method for wet regeneration of mixed casting waste sand
  • Wastewater treatment method for wet regeneration of mixed casting waste sand

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] The wastewater treatment method for wet regeneration of mixed casting waste sand comprises the following steps:

[0027] (1) Demulsification: By adding 0.01% AR demulsifier to the wastewater, the emulsified liquid structure is destroyed, so as to separate the solid and liquid phases in the emulsion;

[0028] (2) Primary flocculation: pump the wastewater into the first-stage spiral flocculation tank, add polyaluminium chloride with a weight concentration of 10%, and add 1 / 800 of the wastewater weight, and flocculate for 20 seconds.

[0029] (3) Secondary flocculation: transfer the material in the primary spiral flocculation tank to the secondary spiral flocculation tank, add polyacrylamide (PAM) solution with a weight concentration of 0.1%, the amount added is 1 / 800 of the weight of the wastewater, and flocculate 80 seconds, then transfer the material in the secondary spiral flocculation tank to the inclined plate thickening box, and let it settle for 30 minutes;

[003...

Embodiment 2

[0032] The wastewater treatment method for wet regeneration of mixed casting waste sand comprises the following steps:

[0033] (1) Demulsification: By adding 0.03% AR demulsifier to the wastewater, the emulsified liquid structure is destroyed, so as to separate the solid and liquid phases in the emulsion;

[0034] (2) Primary flocculation: pump the wastewater into the first-stage spiral flocculation tank, add polyaluminum sulfate solution with a weight concentration of 10%, the amount added is 1 / 1000 of the wastewater weight, and flocculate for 30 seconds.

[0035] (3) Secondary flocculation: Transfer the material in the primary spiral flocculation tank into the secondary spiral flocculation tank, add PAM solution with a weight concentration of 0.2%, and the amount added is 1 / 1000 of the wastewater weight, flocculate for 70 seconds, and then put The material in the secondary spiral flocculation tank is transferred to the inclined plate thickening box, and left to settle for 4...

Embodiment 3

[0038] The wastewater treatment method for wet regeneration of mixed casting waste sand comprises the following steps:

[0039] (1) Demulsification: By adding 0.05% AR demulsifier to the waste water, the emulsified liquid structure is destroyed, so as to separate the solid and liquid phases in the emulsion;

[0040] (2) Primary flocculation: pump the wastewater into the first-stage spiral flocculation tank, add polyferric sulfate solution with a weight concentration of 10%, the amount added is 1 / 1200 of the wastewater weight, and flocculate for 50 seconds.

[0041] (3) Secondary flocculation: transfer the material in the primary spiral flocculation tank to the secondary spiral flocculation tank, and add polydimethyldiallylammonium chloride (PDMDAAC) solution with a weight concentration of 0.3%, and the addition amount is 1 / 1100 of the waste water weight, flocculate for 60 seconds, then transfer the material in the secondary spiral flocculation tank to the inclined plate thicke...

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Abstract

The invention provides a wastewater treatment method for wet regeneration of mixed casting waste sand. First, the wastewater is demulsified, and then the suspended matter with larger particles in the wastewater is flocculated in a spiral flocculation tank with an inorganic flocculant, and then an organic flocculant is used to The flocculant flocculates the suspended solids with small particles, and passes through the inclined tube settling tank for static settlement. The floc layer formed by compression at the bottom is pumped out by the sludge pump at the bottom of the settling tank, flocculated with organic flocculant again, and finally concentrated by belt type vacuum filter Integrated machine treatment, the moisture content of the sludge coming out of the filter cake outlet of the belt-type concentrated vacuum filter press integrated machine is below 40%; while the overflow supernatant of the inclined tube settling tank and the clear water outlet The clean water meets the requirements of production circulation water and the standard of direct discharge.

Description

technical field [0001] The invention relates to the recycled waste water of foundry waste sand wet process after treatment, in particular to the method for the recycled waste water of mixed casting waste sand regenerated after treatment. Background technique [0002] Since 2000, the average growth rate of my country's foundry industry has been above 10%, becoming the world's largest producer of castings. In 2011, my country's casting production has exceeded 40 million tons, ranking first in the world. The emission of pollutants in the entire foundry industry in China is as follows: 2 million tons of dust, 4×10 waste gas 6 -8×10 6 10,000 cubic meters, 12 million tons of waste residue, and 50-60 million tons of waste sand. At present, except for a small amount of waste sand that can be reused after dry regeneration, most of the waste sand is mainly discarded and landfilled, which greatly wastes limited resources and causes serious pollution to the environment. [0003] Tec...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F9/04
Inventor 戴伟平罗桂猛刘临琦
Owner 广西兰科资源再生利用有限公司
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