Preparation method of water-soluble composite organosilane passive film on surface of pyrite

A technology of water-soluble compounding and organosilane, which is applied in the direction of chemical instruments and methods, membranes, membrane technology, etc., to achieve the effects of overcoming application defects, simple process, and reducing economic costs

Active Publication Date: 2021-06-25
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the fact that absolute ethanol is used as the solvent of the passivating agent in most of the current researches, the organic silane passivation film needs to be cured under high temperature conditions (above 50°C) to have good oxidation resistance.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0018] The invention provides a method for preparing a water-soluble composite organosilane passivation film on the surface of pyrite.

[0019] In this method, 8 mL of methyltrimethoxysilane is first placed in a beaker, and 100 mL of hydrolyzed solution is prepared with pure water as a solvent, and the pH of the solution is adjusted to about 3 with 0.5 mol / L hydrochloric acid, and stirred at 40 °C for more than 45 min. ;Add pyrite powder and 3-aminopropyltrimethoxysilane to the hydrolyzate in turn, and adjust the pH to 6.5-7.0 with 0.5mol / L ammonia water, and stir at 15°C-30°C for more than 100min; The chemically treated pyrite is taken out by filtration, and solidified at an atmospheric temperature of 15° C. to 30° C. for more than 3 days to finally obtain a water-soluble composite organosilane passivated pyrite.

[0020] The specific steps are as follows:

[0021] (1) Put 6mL~8mL methyltrimethoxysilane in a beaker, add 92~94mL pure water to make 100mL silane hydrolyzate, ad...

Embodiment 1

[0027] (1) Put 8mL of methyltrimethoxysilane in a beaker, add 92mL of pure water to make 100mL hydrolyzate, adjust the pH of the hydrolyzate to about 3 with 0.5mol / L hydrochloric acid, raise the temperature to 40°C and set the temperature at 200rpm Stir at constant temperature for 45 minutes;

[0028] (2) Add 20g of pyrite powder (-200 mesh accounts for 90%) and 0.1mL of 3-aminopropyltrimethoxysilane successively into the hydrolyzate, stir evenly, adjust the pH to 6.5 with 0.5mol / L ammonia water, and heat up to 30°C, and stirred at a speed of 200rpm for 100min;

[0029] (3) After the pyrite sample in step (2) was filtered and washed, it was placed in a room temperature environment of 30° C. for 3 days to be solidified; the water-soluble composite organosilane passivated pyrite was obtained.

[0030] Take 1.0g water-soluble composite organosilane passivation pyrite and pyrite raw ore respectively, add 120mL of 0.5% H 2 o 2 In the process of rapid oxidation at room temperatur...

Embodiment 2

[0032] (1) Put 7mL methyltrimethoxysilane in a beaker, add 93mL pure water to make 100mL hydrolyzate, adjust the pH of the hydrolyzate to about 3 with 0.5mol / L hydrochloric acid, raise the temperature to 40°C and set the temperature at 200rpm Stir at constant temperature for 50 minutes;

[0033] (2) Add 16g of pyrite powder (-200 mesh accounts for 85%) and 0.16mL of 3-aminopropyltrimethoxysilane successively into the hydrolyzate, stir evenly, adjust the pH to 6.5 with 0.5mol / L ammonia water, and heat up to 25°C, and stirred at 200rpm for 120min;

[0034] (3) After the pyrite sample in the step (2) is filtered and washed, it is placed in a room temperature environment of 25° C. and solidified for 3 days; the water-soluble composite organosilane passivated pyrite is obtained.

[0035] Take 1.0g water-soluble composite organosilane passivation pyrite and pyrite raw ore respectively, add 120mL of 0.5% H 2 o 2 In the process of rapid oxidation at room temperature for 7.0 hours, ...

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PUM

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Abstract

The invention provides a preparation method of a water-soluble composite organosilane passive film on the surface of pyrite, and belongs to the technical field of environmental protection. The preparation method comprises the following steps: firstly, preparing hydrolysate with the concentration of methyltrimethoxysilane being 6-8%, adjusting the pH value of the solution to 3 by using hydrochloric acid, and conducting stirring at the water temperature of 40 DEG C for 45 minutes or more; adding pyrite powder and 3-aminopropyltrimethoxysilane sequentially into the hydrolysate, adjusting the pH to 6.5-7.0 with ammonia water, and conducting stirring for 100 min or above at the water temperature of 15-30 DEG C; and filtering and taking out the passivated pyrite, and conducting curing at the atmospheric temperature of 15-30 DEG C for 3 days or more to finally obtain the water-soluble composite organosilane passivated pyrite. According to the preparation method, water serves as a solvent of organosilane, the production cost is low, no safety risk exists, a surface passivation film can be formed in a normal-temperature environment to inhibit oxidation of pyrite, and large-scale application is facilitated.

Description

technical field [0001] The invention relates to the technical field of environmental protection, in particular to a method for preparing a water-soluble composite organosilane passivation film on the surface of pyrite. Background technique [0002] Acid mine drainage (AMD for short) is formed by exposing sulfide minerals (such as pyrite, pyrrhotite and arsenopyrite) in waste rock or tailings to oxygen, water and microorganisms (mainly sulfur oxides). Thiobacillus and Thiobacillus ferrooxidans, etc.) will be oxidized to produce a large amount of acidic substances such as soluble sulfate, and then produce an acidic solution in the form of atmospheric rainfall and surface runoff. AMD has the characteristics of large water volume, low pH value, and a large amount of heavy metal ions. Usually, the pH value of AMD is between 2 and 4, and it contains a high concentration of Fe. 3+ And a lot of chromium, copper, magnesium, lead, cadmium, zinc and so on. If AMD is directly discharg...

Claims

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Application Information

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IPC IPC(8): B01D69/12B01D67/00C02F1/44
CPCB01D69/12B01D67/0079C02F1/44B01D2325/30
Inventor 林海董颖博曾威鸿
Owner UNIV OF SCI & TECH BEIJING
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