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Method of reducing cadmium volatilization in process of preparing biological carbon from straw

A technology of biochar and straw, applied in the field of environmental engineering, to reduce the volatilization of cadmium, facilitate the adsorption and stabilization of cadmium, and increase the specific surface area

Inactive Publication Date: 2018-06-08
湖南玖恪环境工程有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there is still a certain amount of volatilization of heavy metals in the process of using straw to prepare biochar, and how to reduce the volatilization of heavy metals in the process of preparing biochar from straw has become a problem to be solved

Method used

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  • Method of reducing cadmium volatilization in process of preparing biological carbon from straw
  • Method of reducing cadmium volatilization in process of preparing biological carbon from straw

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] This embodiment provides a method for preparing biochar from straw, the specific steps are as follows:

[0019] Clean the rapeseed stalks, put them in an oven to dry at 60°C, crush the dried stalks with a pulverizer, weigh 10 g of the crushed stalks and place them in a clean quartz boat, and then place the quartz boat in a tube furnace (usually into high-purity nitrogen) for firing, the temperature is set at 300°C, 350°C, 400°C, 450°C, 500°C, 550°C, the time is set at 2 hours, and the absorbing liquid is 0.1mol / L hydrochloric acid, which is used to absorb smoke gas.

[0020] After the firing is completed, take out the quartz boat and place it in a drying oven to cool to room temperature, weigh and calculate the carbon yield, and use HCl-HNO 3 -HF-HClO 4 Digest, measure the cadmium content with ICP emission spectrometer (ICPMA8300, Perkinelmer), the obtained results are shown in the table below:

[0021] Table 1 The change of carbon yield and total cadmium with temper...

Embodiment 2

[0026] This embodiment provides a method for preparing biochar from straw, the specific steps are as follows:

[0027] Clean the rapeseed stalks, put them in an oven for drying at 60°C, crush the dried stalks with a pulverizer until they can pass through a 14-mesh sieve, weigh 10g of the crushed stalks and mix them with 0.5g of ferric sulfate, and place them in a clean quartz boat , and then put the quartz boat in a tube furnace (introduced with high-purity nitrogen) for firing, set the temperature at 300°C, set the time for 2 hours, and the absorbing liquid was 0.1mol / L hydrochloric acid.

[0028] After the firing was completed, the quartz boat was taken out and placed in a drying oven to cool to room temperature. The total amount of cadmium was detected to be 11.97 μg, and the specific surface area of ​​biochar was 0.199 m 2 / mg, the calculated Cd fixation rate is 90%.

Embodiment 3

[0030] This embodiment provides a method for preparing biochar from straw, the specific steps are as follows:

[0031] Clean the rapeseed stalks, put them in an oven to dry at 60°C, crush the dried stalks with a pulverizer until they can pass through a 14-mesh sieve, weigh 10g of the crushed straws and mix them with 0.5g of ferric chloride, and place them in a clean quartz Then place the quartz boat in a tube furnace (introduced with high-purity nitrogen) for firing, set the temperature at 300°C, set the time for 2 hours, and the absorbing liquid is 0.1mol / L hydrochloric acid.

[0032] After the firing was completed, the quartz boat was taken out and placed in a drying oven to cool to room temperature. The total amount of cadmium was detected to be 12.58 μg, and the specific surface area of ​​biochar was 0.22 m 2 / mg, the calculated Cd fixation rate was 94.59%.

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Abstract

The invention provides a method of reducing cadmium volatilization in a process of preparing biological carbon from straw. The method comprises the steps of mixing the straw and an iron salt solid ata weight ratio of (5-20):1 for firing. The straw is crop straw after restoration of heavy metal polluted soil. According to the method, the straw and the iron salt solid are mixed at the weight ratioof (5-20): for firing; the specific surface area of the biological carbon is increased; a surface gap structure of the biological carbon is changed; adsorption and stabilization of cadmium are more facilitated; and therefore, the cadmium volatilization is reduced. The method effectively provides a novel solution and an approach for subsequent treatment of restoration of soil heavy metal pollutionby plants, and reduces secondary heavy metal pollution, and plant reclamation has wider application prospects.

Description

technical field [0001] The invention relates to the technical field of environmental engineering, in particular to a method for reducing cadmium volatilization in the process of preparing biochar from straw. Background technique [0002] Phytoremediation of heavy metal-contaminated soil is a treatment method with broad prospects and good benefits. But there are some constraints, one of which is the disposal of large quantities of heavy metal-enriched plants. After the remediation of contaminated soil with enrichment plants is completed, a large amount of harmful biomass will be produced. If it is not disposed of properly, the pollutants will become secondary pollutants and re-enter the environment, which will lose the original meaning of phytoremediation. The main components of heavy metal-enriched plants are lignin, hemicellulose, cellulose, minerals and ash. The main characteristics of enriched plants are high moisture and volatile components, low bulk density and calori...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10B53/02C10B57/06B01J20/20B01J20/30C01B32/05
CPCB01J20/0229B01J20/024B01J20/20B01J2220/42B01J2220/4806B01J2220/4825C10B53/02C10B57/06Y02E50/10
Inventor 向波葛一陈
Owner 湖南玖恪环境工程有限公司
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