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Compound modified biochar chelating agent, preparation method and application thereof

A technology of composite modification and biochar, which is applied in the direction of protective devices against harmful chemicals, can solve the problems of high energy consumption, high raw material cost, and high economic cost, and achieve low energy consumption, low economic cost, and simple process Effect

Active Publication Date: 2018-09-04
GUANGZHOU HUANTOU DESIGN & RES INST CO LTD +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] Aiming at the above defects or improvement needs of the prior art, the present invention provides a composite modified biochar chelating agent, its preparation method and application. The process prepares an incineration fly ash stabilized chelating agent that has a good stabilization effect on heavy metals and is relatively less affected by changes in environmental factors. This solves the problem of the high cost of raw materials for several types of stabilized agents and the large energy consumption in the preparation process. Technical issues with high economic costs

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  • Compound modified biochar chelating agent, preparation method and application thereof
  • Compound modified biochar chelating agent, preparation method and application thereof
  • Compound modified biochar chelating agent, preparation method and application thereof

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preparation example Construction

[0028] The preparation method of composite modified biochar chelating agent provided by the invention comprises the following steps:

[0029] (1) Sulfur-based modification: Mix the dry biochar powder with the sulfur-based modification solution to obtain a suspension, mix each liter of sulfur-based modification solution with 20-60g of biochar powder, keep stirring for 6h to 8h and maintain the temperature At 35°C to 45°C, the solid phase obtained after solid-liquid separation is sulfur-based modified biochar; the sulfur-based modified solution is a carbon disulfide solution with a pH value of 10-12 and a concentration of 5.6-8.5mol / L ;

[0030] The biochar powder is prepared according to the following method: the biochar is dried, ground into powder, and passed through a 60-100 mesh sieve.

[0031] The sulfur-based modified solution is prepared according to the following method:

[0032] Adjust the pH value of the carbon disulfide solution to 10-12 with an alkaline solution, ...

Embodiment 1

[0042] A preparation method of composite modified biochar chelating agent, comprising the following steps:

[0043] (1) Sulfur-based modification: Mix dry biochar powder with sulfur-based modification solution to obtain a suspension, mix each liter of sulfur-based modification solution with 20 g of biochar powder, keep stirring for 6 hours and maintain the temperature at 35 °C, The solid phase obtained by suction filtration is sulfur-based modified biochar;

[0044] The biochar powder is prepared according to the following method: the biochar is dried, ground into powder, and passed through a 60-mesh sieve.

[0045] The sulfur-based modified solution is prepared according to the following method: the configured 1.50mol / L sodium hydroxide solution is mixed with a 16.54mol / L carbon disulfide solution according to a volume ratio of 1:1; the sulfur-based modified solution is Carbon disulfide solution with a pH value of 10 and a concentration of 5.6 mol / L.

[0046] The solid phas...

Embodiment 2

[0052] A preparation method of composite modified biochar chelating agent, comprising the following steps:

[0053] (1) Sulfur-based modification: Mix dry biochar powder with sulfur-based modification solution to obtain a suspension, mix each liter of sulfur-based modification solution with 30 g of biochar powder, keep stirring for 6.5 hours and maintain the temperature at 40 °C , the solid phase obtained by suction filtration is sulfur-based modified biochar;

[0054] The biochar powder is prepared according to the following method: the biochar is dried, ground into powder, and passed through an 80-mesh sieve.

[0055] The sulfur-based modified solution is prepared according to the following method: the configured 1.50mol / L sodium hydroxide solution is mixed with a 16.54mol / L carbon disulfide solution according to a volume ratio of 1:1; the sulfur-based modified solution is Carbon disulfide solution with a pH value of 10.5 and a concentration of 7.5 mol / L.

[0056] The soli...

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Abstract

The invention discloses a compound modified biochar chelating agent, a preparation method and application thereof. The chelating agent is composite modified biochar. The surface of the chelating agentis loaded with 1%-6%, by mass, of sulfur, 2%-4%, by mass, of phosphorus and 2%-8%, by mass, of silicon. The load type of the sulfur comprises dithio-carboxyl, and the load form of the phosphorus andthe silicon comprises thio-phosphate group. The preparation method comprises the steps of (1) modification of thio, and (2) modification of thio-phosphoric acid. The chelating agent is applied to chelate heavy metal in waste incineration fly ash, the economic cost of the chelating agent is greatly reduced, and the chelating agent is easily applied in large-scale production, and the practical popularization value is achieved.

Description

technical field [0001] The invention belongs to the field of hazardous waste treatment and disposal, and more specifically relates to a composite modified biochar chelating agent, its preparation method and application. Background technique [0002] With the expansion of the scale of cities in our country, the improvement of economic level and people's living standards, the amount of municipal solid waste is increasing day by day. Domestic waste incineration has become the main disposal method of urban domestic waste due to its advantages of good volume reduction, high degree of harmlessness, and high heat utilization rate. It has been widely used and developed rapidly in recent years. Incineration fly ash is a secondary pollutant produced in the process of waste incineration, and its output is about 3%-5% of the amount of waste incineration. Incineration fly ash contains a large amount of soluble heavy metals, which has high leaching toxicity and has been included in the l...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A62D3/33A62D101/43
CPCA62D3/33A62D2101/43
Inventor 陈清汪屈峰朱锋卢加伟史力争海景张焕亨罗翠红张洁茹于晓巍谢冰洪澄泱陈杰娥谢颖诗龙颖贤
Owner GUANGZHOU HUANTOU DESIGN & RES INST CO LTD
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