Passivator with self-repairing function as well as preparation method and application thereof

A passivation agent and self-healing technology, applied in chemical instruments and methods, transportation and packaging, solid waste removal, etc., can solve the difficulty of increasing the passivation of tailings, affecting the stability of the passivation film, and the difficulty of the passivation film Increase and other problems to achieve the effects of cost controllable, reduced treatment cost, and long passivation time

Active Publication Date: 2021-02-19
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

So far, this mechanism has been widely used in the field of intelligent anti-corrosion coatings, but there have been no relevant reports in the field of tailings pollution control
In a more complex and changeable mine environment, the oxidation of metal sulfide minerals produces a large amount of acid mine wastewater (AMD) with low pH and strong oxidation, which makes it more difficult for the passive film to actively repair cracks; at the same time, once the passive film appears local damage, a large number of microbial communities will intensify the oxidation of tailings and affect the overall stability of the passivation film, which also puts forward more stringent requirements for the rapid self-healing of local cracks in the passivation film; in addition, a large number of tailings waste Accumulation in the environment increases the difficulty of tailings passivation

Method used

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  • Passivator with self-repairing function as well as preparation method and application thereof
  • Passivator with self-repairing function as well as preparation method and application thereof
  • Passivator with self-repairing function as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0052] (1) Disperse 5g of natural attapulgite clay (ATP) in 250ml, 4mol / L HCl, stir at room temperature for 4h; separate and wash and then disperse in 50ml, 3mol / L NaOH solution, stir at room temperature for 1h; separate and wash with 2 The heating rate of °C / min was raised to 350 °C and kept for calcination for 1 h. Finally, 2 g of the modified ATP was dispersed in 50 mL, 50 mg / mL of 8-HQ ethanol solution, stirred for 24 h, separated and dried to obtain the nanofiller.

[0053] (2) Add gamma-mercaptopropyltrimethoxysilane and tetraethoxysilane with a volume ratio of 4:1 to a water / ethanol mixed solvent with a volume ratio of 1:8, wherein the mixed organic silane accounts for 1% of the mixed solvent mass 2wt%, then add sodium alginate with 1wt% mixed solvent mass (that is, the mass ratio of organosilane to sodium alginate is 2:1), adjust the pH of the solution to 4.0 with 0.1mol / L hydrochloric acid, and hydrolyze at 40°C for 2h , to obtain a silanol-sodium alginate solution. ...

Embodiment 2

[0057] (1) Disperse 2g ATP in 60ml, 2mol / L HCl, stir at room temperature for 2h; separate and wash and then disperse in 20ml, 3mol / L NaOH solution, stir at room temperature for 1h; separate and wash at a heating rate of 2°C / min Heat up to 350°C and heat-preserve for calcination for 1h. Finally, 2 g of the modified ATP was dispersed in 100 ml, 10 mg / ml 8-HQ ethanol solution, stirred for 20 h, separated and dried to obtain the nanofiller.

[0058] (2) Add gamma-mercaptopropyltrimethoxysilane and tetraethoxysilane with a volume ratio of 1:4 to a water / ethanol mixed solvent with a volume ratio of 1:8, wherein the mixed organic silane accounts for 1% of the mixed solvent mass 0.5wt%, and then add 0.5wt% sodium alginate mixed solvent, adjust the pH of the solution to 3.5 with 0.1mol / L hydrochloric acid, hydrolyze at 40°C for 1.5h, and obtain a silanol-sodium alginate solution.

[0059] (3) Add 0.4 wt% of the mixed solvent mass of the nanofiller prepared in step (1) to the above sil...

Embodiment 3

[0062] (1) Disperse 4g ATP in 120ml, 3mol / L HCl, stir at room temperature for 3h; after separation and washing, disperse in 50ml, 4mol / L NaOH solution, stir at room temperature for 1.5h; after separation and washing, heat up at 3°C / min Raise the temperature to 400°C and heat-preserve for 1.5h. Finally, 2 g of the modified ATP was dispersed in 50 mL, 50 mg / mL of 8-HQ ethanol solution, stirred for 22 h, separated and dried to obtain the nanofiller.

[0063] (2) Add γ-mercaptopropyltrimethoxysilane and tetraethoxysilane with a volume ratio of 2:3 to a water / ethanol mixed solvent with a volume ratio of 4:1, wherein the mixed organic silane accounts for 2% of the mixed solvent mass 1 wt%, and then add 2 wt% sodium alginate mixed solvent, adjust the pH of the solution to 4.0 with 0.1 mol / L hydrochloric acid, and hydrolyze at 35°C for 2 hours to obtain a silanol-sodium alginate solution.

[0064] (3) Add 0.6 wt% of the mixed solvent mass of the nanofiller prepared in step (1) to the...

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Abstract

The invention discloses a passivator with a self-repairing function as well as a preparation method and application thereof. According to the method, mixed organosilane is used as a main body passivator, a modified nano container loaded with a repairing agent is used as a nano filler, and sodium alginate is used as an assistant cross-linking agent, so that the surface coating passivation of the pyrite is realized. According to the method, the physical performance and stability of the passivation film can be greatly improved, the passivation film is endowed with a self-repairing function, micropores or microcracks appearing in the passivation film can be self-repaired, and the oxidation rate of pyrite is effectively decreased. Meanwhile, the use amount of organosilane and the use frequencyof the passivator are also reduced, and the tailing pollution treatment cost is reduced.

Description

technical field [0001] The invention belongs to the technical field of environmental heavy metal pollution treatment, and in particular relates to a passivator with self-repairing function, a preparation method thereof and an application in tailings pollution treatment. Background technique [0002] With the rapid development of industrial society, people are developing and utilizing mineral resources on a larger and larger scale, and a large amount of tailings and waste residues are piled up in the environment. These tailings waste residues (especially metal sulfide minerals) release a large amount of toxic heavy metal ions and SO under the joint action of rainfall leaching, natural weathering and microorganisms. 4 2- etc., seriously polluting the ecological environment and threatening human living space. Therefore, the prevention, control and treatment of tailings pollution has become an urgent problem to be solved in environmental governance at home and abroad. At pres...

Claims

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Application Information

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IPC IPC(8): C09D183/08C09D105/04C09D7/62C09D7/63B09B3/00
CPCC09D183/08C09D7/62C09D7/63C09D4/00C08K2201/011C08G77/28B09B3/20C08L5/04C08K9/12C08K3/346C08K5/3437
Inventor 章莉娟庾明茂杨谦冯晶党志
Owner SOUTH CHINA UNIV OF TECH
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