Method for restoring cyanide contaminated soil by using low-temperature heat treatment technology

A technology for low-temperature heat treatment and polluted soil, applied in the field of soil remediation, can solve the problems of complicated operation, low cyanide removal rate, high energy consumption, and achieve the effect of high removal rate

Active Publication Date: 2019-01-11
CHONGQING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] Aiming at the deficiencies of the above-mentioned prior art, the object of the present invention is to provide a method for repairing cyanide-contaminated soil by low-temperature heat treatment technology, so as to solve the problems of high energy consumption, low cyanide removal rate and affecting the physical and chemical properties of the soil in the existing cyanide-contaminated soil restoration. problems such as nature and cumbersome operation

Method used

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  • Method for restoring cyanide contaminated soil by using low-temperature heat treatment technology
  • Method for restoring cyanide contaminated soil by using low-temperature heat treatment technology
  • Method for restoring cyanide contaminated soil by using low-temperature heat treatment technology

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] Use potassium ferricyanide mold to mix soil A-1 for experiments (theoretical value of cyanide content is 100mg / kg, measured value is 86.72±1.04423mg / kg), crushed to a particle size below 2mm and sieved, then take 12g of A-1 after sieving The sample is placed in a tube furnace, and then heated at 250°C for 1 hour to decompose potassium ferricyanide, and then the tail gas generated by thermal decomposition is passed into the sodium hydroxide absorption solution with a pH of 12 through a closed pipeline.

Embodiment 2

[0038] Use potassium ferricyanide mold to mix soil A-2 for experiment (theoretical value of cyanide content is 1000mg / kg, measured value is 1007±9.0367mg / kg), crush to particle size below 2mm and sieve, then take 12g A-2 after sieving The sample is placed in a tube furnace, and then heated at 250°C for 1 hour to decompose potassium ferricyanide, and then the tail gas generated by thermal decomposition is passed into the sodium hydroxide absorption solution with a pH of 12 through a closed pipeline.

Embodiment 3

[0040] Potassium ferrocyanide was used to mix soil B-1 for experiments (theoretical value of cyanide content was 100mg / kg, measured value was 73.85±2.0367mg / kg), crushed to a particle size below 2mm and sieved, and then 12g of B- 1 Place the sample in a tube furnace, and then heat it at 250°C for 1 hour to decompose potassium ferricyanide, and then pass the tail gas generated by thermal decomposition into the sodium hydroxide absorption solution with a pH of 12 through a closed pipeline.

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Abstract

The invention discloses a method for restoring cyanide contaminated soil by using a low-temperature heat treatment technology. According to the method, the cyanide contaminated soil is used as a research object, common cyanides in the field soil are used as target contaminated substances, and thermal decomposition is carried out on the cyanides by using the low-temperature heat treatment technology, so that the uttermost removal of the cyanides in the soil is efficiently and safely achieved, and the treated soil meets the national "exhibition land soil environment quality evaluation standard HJ350-2007" grade-B standard; the cyanide contaminated land soil is restored by adopting the low-temperature heat treatment technology, so that the removal rate of the cyanides can reach 99% or above,and the degradation rate can reach 97% or above; the method aims at the medium-and-high-concentration cyanogen-containing soil, and the advantages that the efficiency is high, the time is short, and no secondary pollution occurs are achieved; the damage to the physical and chemical properties and the natural fertility of the treated soil is small, so that the situations that the soil can be backfilled after being treated and the agricultural production is restored become possible; and powerful technical support is provided for comprehensive treatment and safety reutilization of a cyanide contaminated site.

Description

technical field [0001] The invention relates to a method for repairing cyanide-contaminated soil, in particular to a method for repairing cyanide-contaminated soil by low-temperature heat treatment technology, and the invention belongs to the technical field of soil restoration. Background technique [0002] Due to the generally extensive economic development mode in my country, the industrial structure and layout are still not reasonable, the total amount of pollutant discharge is relatively high, and the soil, as the final receptor of most pollutants, has a significant impact on its environmental quality. The results of the survey on the status of soil pollution show that the overall situation of the national soil environment is not optimistic, and some areas have serious soil pollution. The state also attaches great importance to the prevention and control of soil pollution. Soil remediation is an important part of "soil pollution prevention and control". For different ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B09C1/06B09C1/00
CPCB09C1/00B09C1/065
Inventor 魏云梅付鹏睿邓歆王斐杜玲刘夏瑜石德智
Owner CHONGQING UNIV
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