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Preparation method of modified papermaking sludge soil heavy metal passivator

A technology of heavy metal passivation agent and papermaking sludge, which is applied in the fields of chemical instruments and methods, soil conditioning materials, agriculture, etc. Solve problems such as complex mud composition, achieve the effects of reducing secondary pollution, easy operation, and simple modification steps

Active Publication Date: 2019-06-28
GUANGXI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Papermaking sludge has the characteristics of complex composition, high moisture content, and difficult treatment. At present, enterprises mostly use landfill, open-air stacking and incineration for treatment. The concept of sustainable development and the requirements in the "Twelfth Five-Year Plan" that "the textile industry should strengthen environmental protection" and "promote the resource utilization of bulk industrial solid waste", therefore, the resource utilization of papermaking sludge has become an urgent need solved problem
However, there are no relevant reports on the preparation of soil heavy metal passivators by modifying papermaking sludge.

Method used

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  • Preparation method of modified papermaking sludge soil heavy metal passivator

Examples

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Effect test

Embodiment 1

[0021] The preparation method of modified papermaking sludge soil heavy metal deactivator, according to the following steps:

[0022] (1) After the papermaking sludge is precipitated and the supernatant is removed, the precipitate is dried at 55°C until the moisture content is 5%, and ground through a 60-mesh sieve for subsequent use;

[0023] (2) Take the above 4g papermaking sludge powder and place it in a beaker, add a NaOH solution with a mass concentration of 10% according to the solid-to-liquid ratio of 1g:50mL, and continue stirring for 1 hour;

[0024] (3) Add 20 mL of 3-mercaptopropyltrimethoxysilane solution with a mass concentration of 10% to the above mixture for modification, and keep stirring in a water bath at 30° C. for 8 hours;

[0025] (4) After the reaction, filter with suction, wash 3 times with ethanol with a volume concentration of 95%, then wash 3 times with deionized water, dry at 50°C to constant weight, and grind through a 100-mesh sieve to obtain Th...

Embodiment 2

[0027] The preparation method of modified papermaking sludge soil heavy metal deactivator, according to the following steps:

[0028] (1) After the papermaking sludge is precipitated and the supernatant is removed, the sediment is dried at 55° C. to a moisture content of 4%, ground through a 60-mesh sieve, and set aside;

[0029] (2) Take the above 4g of papermaking sludge powder and place it in a beaker, add a NaOH solution with a mass concentration of 20% according to the solid-to-liquid ratio of 1g:10mL, and continue stirring for 1 hour;

[0030] (3) Add 40 mL of thioglycolic acid solution with a mass concentration of 10% to the above mixture for modification, and keep stirring in a water bath at 50° C. for 4 hours;

[0031] (4) After the reaction, filter with suction, wash 4 times with ethanol with a volume concentration of 95%, then wash 4 times with deionized water, dry at 50°C to constant weight, and grind through a 100-mesh sieve to obtain The product passivator of th...

Embodiment 3

[0033] The preparation method of modified papermaking sludge soil heavy metal deactivator, according to the following steps:

[0034] (1) After the papermaking sludge is precipitated and the supernatant is removed, the precipitate is dried at 55°C until the moisture content is 5%, and ground through a 60-mesh sieve for subsequent use;

[0035] (2) Take the above 4g of papermaking sludge powder and place it in a beaker, add a NaOH solution with a mass concentration of 5% according to the solid-to-liquid ratio of 1g:100mL, and continue stirring for 1 hour;

[0036] (3) Add 5mL of 10% methyl thioglycolate solution to the above mixture for modification, and keep stirring in a water bath at 80°C for 1 hour;

[0037] (4) After the reaction, filter with suction, wash 3 times with ethanol with a volume concentration of 95%, wash 4 times with deionized water, dry at 50°C to constant weight, and grind through a 100-mesh sieve to obtain The product passivator of the present invention. ...

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Abstract

The invention discloses a preparation method of modified papermaking sludge soil heavy metal passivator. The method comprises the following steps that 1, papermaking sludge precipitates are dried at 55 DEG C till the moisture content is below 5%, and the dried precipitates are ground and sieved through a 60-mesh sieve; 2, an appropriate number of pretreatment agents are added, and continuous stirring is conducted for one hour; 3, a sulfydryl modification agent or carbon disulfide is added for modification, the sulfydryl modification agent needs to be prepared into a solution with the mass concentration equal to 10%, and reaction is conducted for 1-8 h when continuous stirring is conducted on the condition that the reaction temperature is kept to range from 30 DEG C to 80 DEG C; 4, after the reaction is completed, suction filtration is conducted, washing is conducted for 3-4 times through 95% ethanol, washing is conducted for 3-4 times through deionized water, the precipitates are ground and sieved through a 100-mesh sieve after being dried at 50 DEG C to the constant weight, and the modified papermaking sludge passivator is obtained. The passivator has a good absorption effect on heavy metal and good passivation and repair effects on soil polluted by the heavy metal, the soil polluted by the heavy metal can be repaired safely and effectively, and effective utilization of waste resources can be achieved.

Description

technical field [0001] The invention relates to a preparation method of a heavy metal adsorbent, which belongs to the field of soil heavy metal pollution control in environmental protection, in particular to a preparation method of a modified papermaking sludge soil heavy metal passivator. Background technique [0002] Human activities such as long-term mineral resource development, industrial development, and agricultural production have resulted in the accumulation of heavy metals in the soil, resulting in serious heavy metal pollution. According to the "China Cultivated Land Geochemical Survey Report (2015)" issued by the China Geological Survey Bureau, the proportion of heavy metal pollution in my country accounted for 2.5%, reaching 34.88 million mu; the proportion of light-light pollution accounted for 5.7%, reaching 78.99 million mu . Heavy metal pollution cannot be biodegraded, which not only causes great harm to animals and plants, but also can be continuously enric...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K17/40
CPCC09K17/40
Inventor 刘妮王双飞覃程荣朱红祥刘新亮
Owner GUANGXI UNIV
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