Preparation method of low-arsenicred iron oxide pigment
A technology for iron oxide red and pigment, applied in the field of preparation of low arsenic iron oxide red pigment, can solve the problems of consumption of iron non-renewable resources, unsatisfactory product performance, and inability to effectively control the content, etc., and achieve good color covering power, particle size and the like The effect of fine-tuning and improving the degree of automatic production
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Embodiment 1
[0033] The production method of described iron oxide red pigment as shown in Figure 1 comprises seed crystal preparation and two-step oxidation, and processing step is as follows:
[0034] i) seed crystal preparation,
[0035] a) Put 650Kg low-arsenic iron sheet into the high-pressure barrel, and add appropriate amount of water;
[0036] b) warming up to 70°C and injecting 1000kg parts by weight of dilute nitric acid with a content of 40%;
[0037] c) React at a pressure of 0.35Mpa, keep the pressure for 15min, open the vent valve, drop to a pressure of 0.1-0.2Mpa, and transport it to the seed storage tank.
[0038] ii) Ferrous nitrate preparation part
[0039] d) Put the iron sheet in a long reaction tank, and react with dilute nitric acid at a long temperature (≤60° C.) to generate ferrous nitrate and ammonium nitrate. The concentration after the reaction is 10.8%, and the pH value is 3.0.
[0040] iv) ferrous sulfate preparation part
[0041] e) dissolving the solid fer...
Embodiment 2
[0047] As shown in Figure 1, the production method of described iron oxide red pigment comprises seed crystal preparation and two-step oxidation, and process step is as follows:
[0048] i) Seed crystal preparation
[0049] a) Put 680Kg low-arsenic iron sheet into the high-pressure barrel, and add appropriate amount of water;
[0050] b) warming to 70°C and injecting 1250kg parts by weight of dilute nitric acid with a content of 40%;
[0051] c) React at a pressure of 0.40Mpa, keep the pressure for 15min, open the vent valve, drop to a pressure of 0.1-0.2Mpa, and transport to the seed storage tank.
[0052] ii) Ferrous nitrate preparation part
[0053] d) Put the iron sheet in a long reaction tank, and react with dilute nitric acid at a long temperature (≤60° C.) to generate ferrous nitrate and ammonium nitrate. The concentration after the reaction is 11.7%, and the pH value is 3.2.
[0054] iv) ferrous sulfate preparation part
[0055] e) dissolving the solid ferrous sulfat...
Embodiment 3
[0062] As shown in Figure 1, the production method of described iron oxide red pigment comprises seed crystal preparation and two-step oxidation, and process step is as follows:
[0063] i) seed crystal preparation,
[0064] a) Put 750Kg low-arsenic iron sheet into the high-pressure barrel, and add appropriate amount of water;
[0065] b) flushing temperature to 70 ℃ and injecting 1380kg parts by weight of dilute nitric acid with a content of 40%'
[0066] c) React at a pressure of 0.45Mpa, keep the pressure for 15min, open the vent valve, drop to a pressure of 0.1-0.2Mpa, and transport to the seed storage tank.
[0067] ii) Ferrous nitrate preparation part
[0068] d) Put the iron sheet in a long reaction tank, and react with dilute nitric acid at a long temperature (≤60° C.) to generate ferrous nitrate and ammonium nitrate. The concentration after the reaction is 13.5%, and the pH value is 3.6.
[0069] iv) ferrous sulfate preparation part
[0070] e) dissolving the soli...
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