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Long-acting tailing passivator capable of being cured at normal temperature as well as preparation method and application of long-acting tailing passivator

A technology of room temperature solidification and passivation agent, which is applied in the field of acid mine wastewater treatment and metal mine tailings passivation to achieve the effects of cost economy, cost reduction and simple process

Active Publication Date: 2022-05-17
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The method of chemical reaction curing is often used in the research of resin coatings, but it has not been reported in the field of metal mine tailings passivation, which provides a new strategy for crosslinking and curing of tailings passivators

Method used

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  • Long-acting tailing passivator capable of being cured at normal temperature as well as preparation method and application of long-acting tailing passivator
  • Long-acting tailing passivator capable of being cured at normal temperature as well as preparation method and application of long-acting tailing passivator
  • Long-acting tailing passivator capable of being cured at normal temperature as well as preparation method and application of long-acting tailing passivator

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0056] (1) Stir and dissolve sodium carbonate in deionized water, add dibutyl phosphate according to the molar ratio of dibutyl phosphate to sodium is 1:1, to obtain a 0.1mol / L sodium organophosphate solution; configure 0.033mol / L chlorinated For cerium solution, add an equal volume of cerium chloride solution to the sodium organophosphate solution dropwise, stir rapidly at room temperature, continue to stir for 2 hours after the addition, wash 5 times with deionized water, separate by suction filtration, and dry at 60°C for 24 hours to obtain Cerium organophosphate (Ce(dbp) 3 ) into a pulverizer to grind the solid to obtain restoration agent granules.

[0057] (2) Add γ-glycidyl etheroxytrimethoxysilane into a water / ethanol mixed solvent with a volume ratio of 1:2 to configure a 4wt% silane solution, adjust the pH to 5 with 0.1mol / L hydrochloric acid, and Magnetic stirring at 500 rpm at room temperature for 4 hours to carry out hydrolysis reaction to obtain a silanol solutio...

Embodiment 2

[0062] (1) Stir and dissolve sodium carbonate in deionized water, add dibutyl phosphate according to the molar ratio of dibutyl phosphate to sodium is 1:1, to obtain a 0.1mol / L sodium organophosphate solution; configure 0.033mol / L chlorinated For cerium solution, add an equal volume of cerium chloride solution to the sodium organophosphate solution dropwise, stir rapidly at room temperature, continue stirring for 2 hours after the addition, wash with deionized water for 7 times, separate by suction filtration, and dry at 70°C for 12 hours to obtain Cerium organophosphate (Ce(dbp) 3 ) into a pulverizer to grind the solid to obtain restoration agent granules.

[0063] (2) Add γ-glycidyl etheroxytrimethoxysilane to a water / ethanol mixed solvent with a volume ratio of 1:4 to form a 2wt% silane solution, adjust the pH to 3 with 0.1mol / L hydrochloric acid, and Magnetic stirring at 500 rpm at room temperature for 2 hours to carry out hydrolysis reaction to obtain a silanol solution....

Embodiment 3

[0068] (1) Stir and dissolve sodium carbonate in deionized water, add dibutyl phosphate according to the molar ratio of dibutyl phosphate to sodium is 1:1, to obtain a 0.1mol / L sodium organophosphate solution; configure 0.033mol / L chlorinated For cerium solution, add an equal volume of cerium chloride solution to the sodium organophosphate solution dropwise, stir rapidly at room temperature, continue stirring for 1 hour after the addition, wash with deionized water for 6 times, separate by suction filtration, and dry at 50°C for 30 hours to obtain Cerium organophosphate (Ce(dbp) 3 ) into a pulverizer to grind the solid to obtain restoration agent granules.

[0069] (2) Add γ-glycidyl etheroxytrimethoxysilane into a water / ethanol mixed solvent with a volume ratio of 4:5 to configure a 5wt% silane solution, adjust the pH to 4 with 0.1mol / L hydrochloric acid, and Magnetic stirring at 500 rpm at room temperature for 3 hours to carry out hydrolysis reaction to obtain a silanol sol...

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Abstract

The invention discloses a long-acting tailing passivator capable of being cured at normal temperature as well as a preparation method and application of the long-acting tailing passivator. According to the invention, epoxy silane is taken as a main body, aliphatic polyamine is taken as a curing agent, organic cerous phosphate is taken as a repairing agent, the surface of pyrite is coated and passivated through an impregnation method, curing is carried out at normal temperature, and a passive film can inhibit tailing oxidation for a long time. Normal-temperature curing of the passive film is achieved through chemical reaction curing, and the operation and cost problems caused by high-temperature curing in the industry are avoided; the repairing agent with a simple preparation process can repair a locally damaged passivation film under the stimulation of acid and alkali, endows the passivation film with a self-repairing function, improves the effect, reduces the cost, enhances the long-acting passivation performance, and reduces the application frequency of the passivator. The tailing passivator disclosed by the invention has the characteristics of good passivation performance, good long-term effect and the like, avoids the defects of complex preparation, high-temperature curing and the like, is convenient for large-scale industrial production and application of tailing pollution treatment, and can be applied to the field of metal mine tailing passivation.

Description

technical field [0001] The invention belongs to the technical field of acid mine wastewater treatment, and in particular relates to a preparation method of a long-acting tailings passivator capable of curing at room temperature and its application in tailings treatment, which is applicable to the field of metal mine tailings passivation. Background technique [0002] Mineral resources are an important material basis for the rapid development of my country's social economy. During the mining process, some metal minerals are not recovered, but are directly discarded as tailings. A huge amount of tailings not only occupies land resources, but also a large number of sulfides contained in the tailings are oxidized under the combined action of oxygen, microorganisms, and rainwater erosion in the environment to produce a large amount of acid mine wastewater AMD (acid mine wastewater) containing various heavy metal ions. mine drainage). AMD seriously pollutes rivers and soil, and ...

Claims

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Application Information

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IPC IPC(8): A62D3/33A62D101/43
CPCA62D3/33A62D2101/43
Inventor 章莉娟冯晶杨谦周程亮
Owner SOUTH CHINA UNIV OF TECH
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