Surface treatment method of iron oxide red
A technology of surface treatment and iron oxide red, which is applied in the direction of iron oxide, iron oxide/iron hydroxide, coating, etc., can solve the problems of affecting the covering power of iron oxide red, poor dispersion, and restricting the economic benefit of iron red application, etc.
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Embodiment 1
[0038] Step 1, dissolving the pyrite slag with a sulfuric acid solution with a mass fraction of 60%, calcining at 750° C. for 60 minutes to obtain preliminary iron oxide red; wherein the ratio of the volume of the sulfuric acid solution to the mass of the pyrite slag is 2 mL : 1g, the initial particle size of iron oxide red is 50-300nm;
[0039] Step 2. Put the preliminary iron oxide red obtained in step 1 into a 1mol / L KOH solution, and perform magnetic stirring at a constant temperature of 65°C for 30 minutes to obtain a suspension; the quality of the preliminary iron oxide red and the volume of the KOH solution The ratio is 1g: 4mL, and the stirring speed is 130r / min;
[0040] Step 3, adding 3mol / L hydrochloric acid solution to the suspension obtained in step 2 and performing suction filtration until the pH of the filtrate is 7;
[0041] Step 4, putting the iron oxide red after the suction filtration into an oven for drying to obtain the surface-treated iron oxide red.
Embodiment 2
[0043] Step 1, dissolving the pyrite slag with a sulfuric acid solution with a mass fraction of 60%, calcining at 750° C. for 60 minutes to obtain preliminary iron oxide red; wherein the ratio of the volume of the sulfuric acid solution to the mass of the pyrite slag is 2 mL : 1g, the initial particle size of iron oxide red is 50-300nm;
[0044] Step 2. Put the preliminary iron oxide red obtained in step 1 into a 1mol / L KOH solution, and perform magnetic stirring at a constant temperature of 25°C for 30 minutes to obtain a suspension; the quality of the preliminary iron oxide red and the volume of the KOH solution The ratio is 1g: 4mL, and the stirring speed is 130r / min;
[0045] Step 3, adding 3mol / L hydrochloric acid solution to the suspension obtained in step 2 and performing suction filtration until the pH of the filtrate is 7;
[0046] Step 4, putting the iron oxide red after the suction filtration into an oven for drying to obtain the surface-treated iron oxide red.
Embodiment 3
[0048] Step 1, dissolving the pyrite slag with a sulfuric acid solution with a mass fraction of 60%, calcining at 750° C. for 60 minutes to obtain preliminary iron oxide red; wherein the ratio of the volume of the sulfuric acid solution to the mass of the pyrite slag is 2 mL : 1g, the initial particle size of iron oxide red is 50-300nm;
[0049] Step 2. Put the preliminary iron oxide red obtained in step 1 into 1mol / L NaOH solution, and perform magnetic stirring at a constant temperature of 65°C for 30 minutes to obtain a suspension; the quality of the preliminary iron oxide red and the volume of NaOH solution The ratio is 1g: 4mL, and the stirring speed is 130r / min;
[0050] Step 3, adding 3mol / L hydrochloric acid solution to the suspension obtained in step 2 and performing suction filtration until the pH of the filtrate is 7;
[0051] Step 4, putting the iron oxide red after the suction filtration into an oven for drying to obtain the surface-treated iron oxide red.
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