A kind of preparation method of water-soluble composite organosilane passivation film on pyrite surface
A water-soluble composite, organosilane technology, applied in chemical instruments and methods, membrane, membrane technology and other directions, to achieve the effect of overcoming application defects, high practicability, and simple process
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[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 compound organosilane passivation pyrite and pyrite raw ore respectively, add 120mL mass concentration 0.5% H 2 o 2 In the process of rapid oxidation at ...
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 compound organosilane passivation pyrite and pyrite raw ore respectively, add 120mL mass concentration 0.5% H 2 o 2 In the process of rapid oxidation at room temperature ...
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