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Solid waste stabilizer, and preparation method and application thereof

A stabilizer and catalyst technology, applied in the field of solid waste stabilizer and its preparation, can solve the problems of high treatment cost, cumbersome process, and increase the difficulty of stabilization treatment, and achieve the effect of avoiding pollution and improving stability

Inactive Publication Date: 2020-10-23
SHENYANG INST OF APPL ECOLOGY CHINESE ACAD OF SCI
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Problems solved by technology

Among them, cement solidification technology fixes solid waste or hazardous waste in cement. Cement solidification technology greatly increases the volume of solid waste and increases the difficulty of stabilization treatment; glass solidification, high-temperature recrystallization and high-temperature vulcanization solidification technologies are based on high-temperature It can remove the water molecules in the waste residue and induce the formation of a more stable molecular structure, so as to achieve the purpose of reducing the dissolution of heavy metals. The application of this type of technology requires a lot of energy, so the treatment cost is extremely high; the wet leaching recrystallization method is By leaching toxic and valuable metals in the liquid phase, recovering valuable metals and fixing toxic metals in stable minerals, this technology has high processing costs and cumbersome processes

Method used

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  • Solid waste stabilizer, and preparation method and application thereof
  • Solid waste stabilizer, and preparation method and application thereof

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preparation example Construction

[0029] The present invention also provides a method for preparing the solid waste stabilizer described in the above technical solution, comprising the following steps: mixing polyvinyl alcohol, a silicon source, an organic solvent, a catalyst and water, and performing a polymerization reaction to obtain the solid waste stabilizer.

[0030] The invention mixes polyvinyl alcohol, silicon source, organic solvent, catalyst and water to undergo polymerization reaction to obtain the solid waste stabilizer. In the present invention, the types of the polyvinyl alcohol, the silicon source, and the catalyst are those described in the above technical solution, and will not be repeated here. In the present invention, the organic solvent preferably includes one or more of ethanol, methanol and propanol, and more preferably includes ethanol. The proportioning ratio of the specific substances mentioned above is not particularly limited, and any proportioning ratio can be adopted.

[0031] I...

Embodiment 1

[0049] Mix 5g of polyvinyl alcohol (model PVA2488) and 50mL of water, and stir at 60°C for 1h at a speed of 200r / min to obtain a polyvinyl alcohol solution; mix 15g of tetraethyl orthosilicate, 10mL of water, 20g of ethanol and 0.1 g hydrochloric acid (18wt% hydrochloric acid), and stirred at 60°C for 1 hour at a speed of 200r / min to obtain a silicon prepolymerization solution; Stir for 1 hour under the condition of 200r / min to obtain a solid waste stabilizer.

Embodiment 2

[0051] Mix 7g of polyvinyl alcohol (model PVA2488) and 50mL of water, and stir at 70°C for 0.5h at a speed of 80r / min to obtain a polyvinyl alcohol solution; mix 10g of tetraethyl orthosilicate, 10mL of water, 20g of ethanol and 0.05g of hydrochloric acid (36wt% hydrochloric acid) was mixed and stirred at 60°C for 1h at a speed of 150r / min to obtain a silicon prepolymerization solution; 50mL of polyvinyl alcohol solution and 10mL of silicon prepolymerization solution were mixed, The solid waste stabilizer was obtained by stirring for 0.6 h at a rotational speed of 100 r / min.

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Abstract

The invention belongs to the technical field of solid waste treatment, and particularly relates to a solid waste stabilizer, and a preparation method and application thereof. The solid waste stabilizer provided by the invention is prepared by carrying out polymerization reaction on reaction raw materials including polyvinyl alcohol and a silicon source under the action of an acid catalyst. The solid waste stabilizer provided by the invention has fluidity and cohesiveness. When the stabilizer provided by the invention is used for stabilizing the solid waste containing the heavy metals, the solid waste stabilizer can be directly mixed with solid waste, a water-resistant film can be formed on the surface of solid waste particles after the solid waste stabilizer is dried, the solid waste is isolated from the external environment, and dissolution of heavy metal is inhibited, so that the stability of the solid waste is improved, the solid waste reaches the landfill standard, and environmental pollution caused by excessive release of the heavy metal is avoided.

Description

technical field [0001] The invention belongs to the technical field of solid waste treatment, and in particular relates to a solid waste stabilizer and its preparation method and application. Background technique [0002] Heavy metal-containing tailings will be produced during the mining of non-ferrous metal minerals; at the same time, arsenic-calcium slag, arsenic gypsum, arsenic sulfide slag, arsenic-iron co-precipitated slag and stinky onion will be produced during the treatment of arsenic-containing wastewater generated in the process of ferrous metal smelting gravel. These waste residues produced by non-ferrous metal smelting contain a large amount of toxic heavy metal elements, such as arsenic, cadmium, lead and chromium. If it is directly landfilled or stored in the environment without stabilization treatment, the risk of heavy metal pollution in the environment will be significantly increased. Therefore, the stabilization treatment of heavy metal-containing solid w...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F8/42C08F16/06B09B1/00
CPCC08F8/42B09B1/00
Inventor 贾永锋马旭王少锋张国庆林金如
Owner SHENYANG INST OF APPL ECOLOGY CHINESE ACAD OF SCI
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