Chemical preparation method of nanoscale zinc oxide powder

Abstract

The invention discloses a chemical preparation method of nanoscale zinc oxide powder, and the method comprises the following steps of: (1) in a stirring container, adjusting the concentration of a zinc salt solution to be 0.5-2.0mol / L, heating to 20-80 DEG C, adding an alkali solution to cause the pH of the zinc salt solution to be 11-12, and reacting at the temperature of 20-80 DEG C for 1-2 hours, thus obtaining a zinc hydroxide precipitate and a zinc oxide precipitate; (2) filtering and separating to obtain a solid mixture of zinc hydroxide and zinc oxide, and washing the mixture of solid zinc hydroxide and zinc oxide until washing liquid contains no zinc salt anion; and (3) placing the mixture obtained by the step (2) into a flash dryer to be subjected to flashing and drying at the temperature of 150-250 DEG C, and smashing to obtain 96-99% nanoscale zinc oxide powder, wherein the grain diameter of the powder is 50-100nm, and the whiteness of the powder is higher than eighth level.

Description

technical field

[0001] The invention relates to the preparation of a nano-scale zinc oxide powder, in particular to a chemical preparation method of the nano-scale zinc oxide powder. Background technique

[0002] Nano-scale zinc oxide powder is mainly used in rubber tires, catalysts, ceramics, anti-ultraviolet and other fields; especially in the field of rubber tires, it is an important material for manufacturing high-speed wear-resistant tires, and the industry has a huge market capacity and is of great development value. The method of preparing nano-zinc oxide powder is divided into dry method and wet method. The dry method is mainly to generate zinc vapor by evaporating zinc ingots or zinc ore under certain conditions, and then injecting oxygen to generate zinc oxide, which is then captured to obtain the finished product. There is also a high-temperature pyrolysis method, which prepares zinc compounds through solid-phase or liquid-phase chemical reactions, and decompos...

Examples

Embodiment 1

[0023] (1) Prepare 1.5mo / L zinc sulfate solution and 30% sodium hydroxide solution, and slowly add 30% sodium hydroxide solution into the zinc sulfate solution in a water bath at 70°C to make the pH of the solution 11 (reaction During the process, the pH is not lower than 11), the stirring speed is 400 rpm, and the precipitation of zinc hydroxide and zinc oxide is obtained after reacting at 70°C for 1 hour;

[0024] (2) Filtrate and separate to obtain a solid zinc hydroxide and zinc oxide mixture, and wash the obtained solid mixture with distilled water for 7 to 8 times until there are no sulfate ions in the filtrate;

[0025] (3) Put the solid mixture obtained in step (2) into a flash dryer, flash, dry, and pulverize at 200°C to obtain 97% nano-sized zinc oxide powder with a particle diameter of 75nm. The whiteness of the powder is 8.5 grade.

Embodiment 2

[0027] (1) Prepare 1.0mo / L zinc sulfate and zinc chloride mixed solution (the ratio of the two can be arbitrary, in this example it is 1:1), and 35% potassium hydroxide solution, at 60°C Under water bath conditions, slowly add 35% potassium hydroxide solution into the mixed solution of zinc sulfate and zinc chloride to make the pH of the solution 12, stir at a speed of 400 rpm, and react at 60°C for 1 hour to obtain zinc hydroxide and Precipitation of zinc oxide;

[0028] (2) Filtrate and separate to obtain a solid zinc hydroxide and zinc oxide mixture, and wash the obtained solid mixture with distilled water for 7 to 8 times until there are no sulfate ions in the filtrate;

[0029] (3) Put the solid mixture obtained in step (2) into a flash dryer, flash, dry, and pulverize at 180°C to obtain 95% nano-sized zinc oxide powder with a particle diameter of 75nm. The whiteness of the powder is 8.5 grade.

Embodiment 3

[0031] (1) Prepare 2.0mo / L zinc nitrate and zinc chloride mixed solution (the ratio of the two is 1:1), and 35% sodium hydroxide and potassium hydroxide solution, and mix 35% Slowly add sodium hydroxide and potassium hydroxide solutions into zinc nitrate and zinc chloride solutions to make the pH of the solution 12, stir at a speed of 400 rpm, and react at 80°C for 1.5 hours to obtain precipitates of zinc hydroxide and zinc oxide ;

[0032] (2) Filtrate and separate to obtain a solid zinc hydroxide and zinc oxide mixture, and wash the obtained solid mixture with distilled water for 7 to 8 times until there are no sulfate ions in the filtrate;

[0033] (3) Put the solid mixture obtained in step (2) into a flash dryer, flash, dry, and pulverize at 250°C to obtain 99% nano-sized zinc oxide powder with a particle diameter of 95nm. The whiteness of the powder is 8.5 grade.

technical field

[0001] The invention relates to the preparation of a nano-scale zinc oxide powder, in particular to a chemical preparation method of the nano-scale zinc oxide powder. Background technique

[0002] Nano-scale zinc oxide powder is mainly used in rubber tires, catalysts, ceramics, anti-ultraviolet and other fields; especially in the field of rubber tires, it is an important material for manufacturing high-speed wear-resistant tires, and the industry has a huge market capacity and is of great development value. The method of preparing nano-zinc oxide powder is divided into dry method and wet method. The dry method is mainly to generate zinc vapor by evaporating zinc ingots or zinc ore under certain conditions, and then injecting oxygen to generate zinc oxide, which is then captured to obtain the finished product. There is also a high-temperature pyrolysis method, which prepares zinc compounds through solid-phase or liquid-phase chemical reactions, and decompos...

Examples

Embodiment 1

[0023] (1) Prepare 1.5mo / L zinc sulfate solution and 30% sodium hydroxide solution, and slowly add 30% sodium hydroxide solution into the zinc sulfate solution in a water bath at 70°C to make the pH of the solution 11 (reaction During the process, the pH is not lower than 11), the stirring speed is 400 rpm, and the precipitation of zinc hydroxide and zinc oxide is obtained after reacting at 70°C for 1 hour;

[0024] (2) Filtrate and separate to obtain a solid zinc hydroxide and zinc oxide mixture, and wash the obtained solid mixture with distilled water for 7 to 8 times until there are no sulfate ions in the filtrate;

[0025] (3) Put the solid mixture obtained in step (2) into a flash dryer, flash, dry, and pulverize at 200°C to obtain 97% nano-sized zinc oxide powder with a particle diameter of 75nm. The whiteness of the powder is 8.5 grade.

Embodiment 2

[0027] (1) Prepare 1.0mo / L zinc sulfate and zinc chloride mixed solution (the ratio of the two can be arbitrary, in this example it is 1:1), and 35% potassium hydroxide solution, at 60°C Under water bath conditions, slowly add 35% potassium hydroxide solution into the mixed solution of zinc sulfate and zinc chloride to make the pH of the solution 12, stir at a speed of 400 rpm, and react at 60°C for 1 hour to obtain zinc hydroxide and Precipitation of zinc oxide;

[0028] (2) Filtrate and separate to obtain a solid zinc hydroxide and zinc oxide mixture, and wash the obtained solid mixture with distilled water for 7 to 8 times until there are no sulfate ions in the filtrate;

[0029] (3) Put the solid mixture obtained in step (2) into a flash dryer, flash, dry, and pulverize at 180°C to obtain 95% nano-sized zinc oxide powder with a particle diameter of 75nm. The whiteness of the powder is 8.5 grade.

Embodiment 3

[0031] (1) Prepare 2.0mo / L zinc nitrate and zinc chloride mixed solution (the ratio of the two is 1:1), and 35% sodium hydroxide and potassium hydroxide solution, and mix 35% Slowly add sodium hydroxide and potassium hydroxide solutions into zinc nitrate and zinc chloride solutions to make the pH of the solution 12, stir at a speed of 400 rpm, and react at 80°C for 1.5 hours to obtain precipitates of zinc hydroxide and zinc oxide ;

[0032] (2) Filtrate and separate to obtain a solid zinc hydroxide and zinc oxide mixture, and wash the obtained solid mixture with distilled water for 7 to 8 times until there are no sulfate ions in the filtrate;

[0033] (3) Put the solid mixture obtained in step (2) into a flash dryer, flash, dry, and pulverize at 250°C to obtain 99% nano-sized zinc oxide powder with a particle diameter of 95nm. The whiteness of the powder is 8.5 grade.

Images