High-whiteness sub-micron spherical barium sulfate and preparation method thereof
A barium sulfate, sub-micron technology, applied in the direction of calcium/strontium/barium sulfate, nanotechnology, etc., can solve the problem of high temperature and equipment requirements, barium sulfate purity, whiteness, particle size and other parameters can not meet the requirements of barium sulfate and other problems, to achieve the effect of simple process
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[0027] A kind of preparation method of submicron spherical barium sulfate of the present invention, realizes by following chemical reaction:
[0028] Ba(NO 3 ) 2 +H 2 SO 4 → BaSO 4 ↓+2HNO 3
[0029] BaCl 2 +H 2 SO 4 → BaSO 4 ↓+2HCl
[0030] BaCO 3 +2HNO 3 →Ba(NO 3 ) 2 +H 2 O+CO 2 ↑
[0031] BaCO 3 +2HCl→BaCl 2 +H 2 O+CO 2 ↑
[0032] S 2- X+1 +H 2 o 2 +H + → SO 4 2- +H 2 o
[0033] The invention adopts barium carbonate as a starting material, reacts with sulfuric acid in the presence of a barium-containing transsolvent, and prepares a submicron spherical barium sulfate product with high whiteness, which basically meets the requirements of downstream industries.
[0034] Specifically, a kind of preparation method of submicron spherical barium sulfate of the present invention comprises the steps:
[0035] (1) After mixing barium carbonate with water, add a barium-containing transfer solvent to obtain slurry 1; wherein the barium-containing transfer...
Embodiment 1
[0063] combine figure 1 As shown, to prepare submicron spherical barium sulfate, add 2000L deionized water to a 5000L glass-lined reaction pot, and add 600 kg of light barium carbonate (D 50 =4.5μm), then add deionized water until the slurry volume is 4000L, then add barium-containing solid Ba(NO 3 ) 2 Make the concentration of nitrate ions in the slurry reach 0.06mol / L, then turn on the heating, control the temperature of the slurry at 40°C, and add 2L27.5%H 2 o 2 Solution, slowly add 98% concentrated sulfuric acid under stirring until the pH reaches 1.0, keep the slurry temperature at 90°C, and stir for another 1.5 hours. Replace the deionized water and mix with the reaction raw material barium carbonate, and filter the cake for the next step. Add deionized water to stir and disperse the above filter cake according to the material-to-water mass ratio of 1:6, heat up to boiling, and use Ba(OH) 2 Adjust the pH of the solution to 7.0, keep boiling slightly for 0.5 hours, s...
Embodiment 2
[0065] Add 2500L deionized water into a 5000L glass-lined reaction pot, and add 600 kg of light barium carbonate (D 50 =4.3μm), then add deionized water to the slurry volume of 4000L, then add solid Ba(NO 3 ) 2 Make the concentration of nitrate ions in the slurry reach 0.1mol / L, then turn on the heating, control the temperature of the slurry at 45°C, and add 3L of 35%H 2 o 2 , slowly add 98% concentrated sulfuric acid under stirring until the pH reaches 2.0, hold the slurry temperature at 95°C, and stir for another 3 hours. After stopping the stirring, press filter to separate the filter cake and mother liquor, and circulate the mother liquor to replace deionization Water is mixed with barium carbonate as the reaction raw material, and the filter cake is subjected to the next step. Add deionized water to stir and disperse the above filter cake according to the mass ratio of material to water as 1:8, heat up to boiling, and use Ba(OH) 2 Adjust the pH of the solution to 8.0,...
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