Environment-friendly titanium pigment prepared by using complexation-precipitation process
A titanium-based pigment and process technology, applied in the field of powder metallurgy preparation, can solve the problems of liquid-phase method agglomeration, low yield, affecting color development, etc., achieve the effects of narrow particle size distribution range, reduce production cost, and simplify production process
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Embodiment 1
[0048] 1) Add 82g of titanium dioxide and 15g of antimony trioxide into 970ml of water, 16g of nickel nitrate into 160ml of water, and clarify the nickel nitrate solution for later use;
[0049] 2) Weigh 0.3g of sodium hexametaphosphate solution, add it into the titanium dioxide mixture, and disperse it for 0.5h;
[0050] 3) Add the dissolved nickel nitrate solution in step 2), and stir for 10-30min;
[0051] 4) Add 0.2g of complexing agent---triethylenetetramine into the dissolved nickel nitrate solution, control the molar ratio of nickel nitrate to triethylenetetramine between 0.5-2, and control the pH value of the system at 6 Between -8, the temperature of the reaction system is raised to 50-70°C, the stirring rate is controlled at 400-600r\min, and the processing time is 0.5h-4h;
[0052] 5) Slowly add the prepared sodium hydroxide clarified solution with a concentration of 0.5-2mol\L into the nickel nitrate solution in step 4) and control the dropping rate to 10ml / min. A...
Embodiment 2
[0056] 1) Add 75g of titanium dioxide and 10g of antimony trioxide into 850ml of water, 15g of chromium nitrate into 150ml of water, and clarify the chromium nitrate solution for later use;
[0057] 2) Weigh the sodium hexametaphosphate solution with a weight of 0.25g of titanium dioxide, add it into the mixture of titanium dioxide, and disperse it for 0.5h;
[0058] 3) Add the dissolved chromium nitrate solution in step 2), and stir for 10-30min;
[0059] 4) Add 0.4g of complexing agent --- citric acid into the dissolved chromium nitrate solution, the molar ratio of chromium nitrate and citric acid is controlled between 0.5-2, and the pH value of the system is controlled between 6-8 During this period, the temperature of the reaction system is raised to 50-70°C, the stirring rate is controlled at 400-600r / min, and the processing time is 0.5h-4h;
[0060] 5) Slowly add the prepared potassium hydroxide clarified solution with a concentration of 0.5-2mol\L into the chromium nit...
Embodiment 3
[0064] 1) Add 70g of titanium dioxide to 700ml of water, add 10g of nickel nitrate, 15g of cobalt nitrate, and 5g of zinc nitrate into 300ml of water, and clarify the solutions of nickel nitrate, cobalt nitrate, and zinc nitrate for later use;
[0065] 2) Weigh the sodium hexametaphosphate solution with a weight of 0.35g of titanium dioxide, add it into the mixture of titanium dioxide, and disperse it for 0.5h;
[0066] 3) Add dissolved nickel nitrate, cobalt nitrate and zinc nitrate solution in step 2), and stir for 10-30min;
[0067] 4) Add 0.7g of complexing agent --- triethylenetetramine and citric acid (ratio 1:1) into the dissolved nickel nitrate, cobalt nitrate and zinc nitrate solution, nickel nitrate, cobalt nitrate and zinc nitrate and The molar ratio of triethylenetetramine and citric acid is controlled between 0.5-2, the pH value of the system is controlled between 6-8, the temperature of the reaction system is raised to 50-70°C, and the stirring rate is controlled...
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