Method for producing the red pigment of ferric oxide from ferrous sulphate of byproduct abolished by titanium white
A technology of ferrous sulfate and iron oxide red, which is applied in the direction of fibrous fillers, etc., can solve the problems that affect the dispersion of the final iron oxide red pigment and serious flocculation, and achieve the effects of reduced production costs, sufficient hydrolysis, and prolonged hydrolysis time
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Embodiment 1
[0030] The refining of embodiment 1 ferrous sulfate
[0031] In a volume of 10m 3 In the corrosion-resistant tank, add 7.0m3 Add 7.0 tons of titanium dioxide waste secondary ferrous sulfate (90%) to water, and now the concentration of ferrous sulfate heptahydrate solution is 700g / L, add 112kg of concentrated sulfuric acid (98%), the initial pH of the system is 1.0~1.5, add 63kg Iron sheet, keep the temperature of the system at 60°C by steaming for 8 hours and measure the pH of the system in the range of 3.0 to 4.5. Then pump into 20m 3 In the settling bucket, add water to a total volume of 16.5m 3 , ferrous sulfate heptahydrate concentration diluted to 400g / L, adding 2.2kg concentration is 20% polyacrylamide flocculant, its consumption is about 0.007% of ferrous sulfate heptahydrate weight, stirred for 10 minutes, left standstill for 6 hours, The supernatant of 15.8m can be separated 3 , which is a refined ferrous sulfate heptahydrate solution with a concentration of 400g / ...
Embodiment 2
[0032] Embodiment 2 seed crystal preparation (using ammonia gas)
[0033] The present embodiment adopts traditional seed bucket, and volume is 40m 3 . Air or ammonia gas enters the seed crystal barrel from the tube at the bottom of the barrel and is evenly distributed into the reaction system in the barrel through the vent hole of the air distributor.
[0034] Inject 30m into the above-mentioned seed crystal bucket 3 Water, and then 146.7kg of ammonia gas was introduced from the bottom of the seed crystal bucket, the temperature of the system was controlled at 20°C, and 2m 3 Refining ferrous sulfate heptahydrate solution (400g / L) made by embodiment 1, now in the barrel, ferrous sulfate heptahydrate concentration is 25g / L, about pH value 9.8, ammonia consumption is ammonia and ferrous sulfate heptahydrate 150% of the theoretical amount of reaction. Then air is introduced from the bottom of the tank for about 2 hours to make the pH of the system reach the range of 9.5-9.7. ...
Embodiment 3
[0035] Embodiment 3 seed crystal preparation (directly adopt ammoniacal liquor)
[0036] The seed crystal barrel adopted in this embodiment is the same as that in Embodiment 2 except that the ammonia water metering tank is housed on the top of the seed crystal barrel.
[0037] In the above-mentioned seed crystal bucket, add ammoniacal liquor (20%) with the ammoniacal liquor metering tank, its amount is 733.5kg, following steps and addition are all the same as embodiment 2. The obtained reddish-brown crystalline iron oxide red seeds are used for oxidation synthesis.
[0038] The method of this embodiment is particularly suitable for selection by users near ammonia water production plants.
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