Process for preparing iron oxide red by using sulfuric acid crystal seed mixed acid method and products thereby
A technology of iron oxide red and sulfuric acid method, which is applied in the direction of chemical instruments and methods, inorganic pigment treatment, fibrous fillers, etc., can solve the problems of atmospheric environmental pollution, large amount of emission, and increased production costs, so as to solve air pollution and improve work Effects of environment and cost reduction of seed crystal raw materials
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Embodiment 1
[0022] In a 1.0 cubic meter seed crystal cylinder (container configured with iron oxide red seed crystals), the preparation concentration is 0.50 cubic meters of ferrous sulfate heptahydrate of 35g / L, slowly adding sodium hydroxide under stirring to a pH value of 10.2, the reaction temperature At 25°C, react for 1.0h to obtain iron oxide red seeds. Then mix the obtained red iron oxide seed crystals with water at a ratio of 1:1, add 0.5mg / L polyacrylamide ammonium, stir rapidly, and when the seed crystals settle down to 1 / 4 of the original total volume, extract the sulfuric acid from the upper part. Add clear water after the salt liquid layer, and then stir and settle. After repeatedly extracting the sulfate-containing liquid layer, adding clear water, and then stirring and settling for 3 times, the iron oxide red seeds after washing were obtained. Then pump the red iron oxide seeds after washing into the two-step oxidation cylinder filled with fluffy iron sheets, stir with ai...
Embodiment 2
[0025] Prepare 0.50 cubic meters of ferrous sulfate heptahydrate with a concentration of 35g / L in a 1.0 cubic meter seed crystal tank, slowly add sodium hydroxide to a pH value of 9.7 under stirring conditions, and react at a temperature of 20°C for 1.3 hours to prepare Obtain iron oxide red crystal seeds. Then mix the obtained red iron oxide seed crystals with water at a ratio of 1:1, add 1.0mg / L polyacrylamide ammonium, and stir rapidly. Add clear water after the salt liquid layer, and then stir and settle. After repeatedly extracting the sulfate-containing liquid layer, add water, and then stir the sedimentation process 5 times. Then pump the water-washed seed crystals into a two-step oxidation cylinder filled with fluffy iron sheets, stir with air for 25 minutes, add 98% sulfuric acid to pH 4.5 when the temperature is raised to 72°C with steam, and add ferrous sulfate heptahydrate solution to ferrous The concentration is 8.93g / L, and the reaction temperature is maintaine...
Embodiment 3
[0028] Prepare 0.50 cubic meters of ferrous sulfate heptahydrate with a concentration of 40 g / L in a 1.0 cubic meter seed crystal tank, slowly add sodium hydroxide under stirring conditions to a pH value of 9.1, and the reaction temperature is 30 ° C. React for 1.2 hours to prepare Obtain iron oxide red crystal seeds. Then mix the obtained red iron oxide seed crystals with water at a ratio of 1:2, add 1.5mg / L polyacrylamide ammonium, and stir rapidly, and when the seed crystals settle down to 1 / 3 of the original total volume, extract the sulfuric acid from the upper part. Add clear water after the salt liquid layer, and then stir and settle. After repeatedly extracting the sulfate-containing liquid layer, add water, and then stir the sedimentation process 4 times. Then pump the water-washed seed crystals into a two-step oxidation cylinder filled with fluffy iron sheets, stir with air for 10 minutes, add 98% sulfuric acid to pH 5.0 when the temperature is raised to 73°C with s...
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