Method and equipment for heavy metal-contaminated soil leaching and heavy metal concentration

A technology for polluted soil and heavy metals, applied in the field of polluted soil treatment and restoration, can solve the problems of long treatment period, difficult resource utilization of pollutants, and high cost of soil heavy metal treatment, and achieves the effect of wide application scope and low economic cost.

Active Publication Date: 2016-01-20
苏州同和环保工程有限公司
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  • Abstract
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  • Application Information

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Problems solved by technology

[0002] The existing soil heavy metal treatment costs are high, the treatment cycle is long, and the treated pollutants are difficult to safely use as resources
At present, domestic soil heavy metal treatment is mostly in the research stage of leaching agent and leaching method and experimental device exploration stage, and there are few large-scale productive researches for industrialization. Among them, Chinese patent application CN201310225512.3, "Heavy Metal Contaminated Site Soil leaching and repairing method and equipment" discloses a soil repairing method for heavy metal pollution. This method separates heavy metal pollutants through physical separation and chemical extraction, and the eluent can be reused, which has a certain soil treatment effect. However, this invention still has deficiencies in the effective utilization of soil resources, the collection of chemical reagents, the number of links in the use of eluents, the concentration technology of the soil, the improvement of the level of large-scale industrial production technology, and the cost and economic benefits. , need to improve

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  • Method and equipment for heavy metal-contaminated soil leaching and heavy metal concentration

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Experimental program
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Effect test

specific Embodiment 1

[0048] The polluted soil has been tested, and the soil within the particle size range of 0.15-2mm has a mass percentage of 100% and a lead content of 670mg / kg. Through the leaching, rotary separation, and vibration of heavy metal contaminated soil leaching and heavy metal concentration methods Separating and dewatering sieve 7 to obtain soil with particle size larger than 0.075mm, and obtain soil containing particles smaller than 0.075mm through the classification of step (5), in fact, soil with particle size of 0.001-0.075mm;

[0049] Soil containing particles larger than 0.075mm has a mass percentage of 66.9% and a lead content of 130mg / kg, which is lower than the Grade A standard (140mg / kg) of the "Evaluation Standard for Soil Environmental Quality of Exhibition Land" (HJ350-2007), which is acceptable. The separated soil is stabilized as required and used as clean soil for resource utilization;

[0050] The soil containing particles smaller than 0.075mm, its mass percentage...

specific Embodiment 2

[0053] The polluted soil has been tested, and the soil within the particle size range of 0.15-2mm has a mass percentage of 100% and a selenium content of 59mg / kg. Through the leaching, rotary separation and vibration of heavy metal contaminated soil and heavy metal concentration methods The effect of separation and dehydration can obtain soil with particle size larger than 0.075mm, and the soil containing particles smaller than 0.075mm can be obtained through the classification of step (5), in fact, the particle size of soil is 0.001-0.075mm;

[0054] Soil containing particles larger than 0.075mm, its mass percentage is 65.9%, and the selenium content is less than 5mg / kg, which is lower than the Grade A standard (39mg / kg) of the "Evaluation Standard for Soil Environmental Quality of Exhibition Land" (HJ350-2007), which can be The separated soil is stabilized as required and used as clean soil for resource utilization;

[0055] The soil containing particles smaller than 0.075mm...

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Abstract

The invention discloses a heavy metal polluted soil eluting and heavy metal concentrating method. The heavy metal polluted soil eluting and heavy metal concentrating method comprises the following steps: carrying out crushing pre-treatment by using a soil crusher; eluting by using an eluting agent; rotating by using a rotary drum to separate soil with the size of more than 20mm; separating soil with the size of 2-20mm by using a vibration sieve; conveying soil slurry with the size of less than 2mm into a secondary cyclone separator to carry out rotary grading; conveying the soil slurry with the light specific gravity into a sedimentation basin and conveying the other part into a dehydrating sieve; conveying the soil deposited in the sedimentation basin to a first filter press and conveying liquid supernatant to a sludge concentration tank; separating soil with the size of 0.075-2mm by using the dehydrating sieve and conveying the other part into the secondary cyclone separator; adding a heavy metal removing agent, a coagulant and a coagulant aid into the sludge concentration tank to concentrate. With the adoption of the manner, the heavy metal polluted soil eluting and heavy metal concentrating method and equipment can be used for removing heavy metals in the soil by an eluting technology and graded sieving and highly concentrating, so that the safety standards are reached.

Description

technical field [0001] The invention relates to the technical field of treatment and restoration of polluted soil, in particular to a method for leaching and concentration of heavy metal polluted soil and equipment thereof. Background technique [0002] The existing soil heavy metal treatment costs are high, the treatment period is long, and the treated pollutants are difficult to be safely utilized as resources. At present, the treatment of heavy metals in soil is mostly in the stage of research on leaching agents and leaching methods and the exploration of experimental devices, and there are few large-scale production studies for industrialization. Soil leaching and remediation method and equipment" discloses a soil remediation method for treating heavy metal pollution. The method separates heavy metal pollutants by physical separation and chemical extraction, and the leaching solution can be reused and has certain soil treatment. Effect, but this invention still has defi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B09C1/00B09C1/08C02F11/14
Inventor 周昱徐晓晶刘美云保嶽陈辉包晓慧菊地达也江藤宏树陈艳萍陈娴唐建锋
Owner 苏州同和环保工程有限公司
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