Preparation of subsphaeroidal barium sulfate by sulfuric acid process and use in copper foil substrate
A barium sulfate, near-spherical technology, applied in chemical instruments and methods, calcium/strontium/barium sulfate, calcium/strontium/barium compounds, etc., can solve the problems of barium sulfate particle shape irregularity, wide particle size distribution, etc. , to achieve the effect of improving Tg value and flame retardant performance, improving whiteness and high thermal conductivity
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Embodiment 1
[0023] (a) Grinding and mixing barite and anthracite, putting them into a calcining converter for calcination, the temperature is controlled at 1200° C., and the calcination time is 2 hours to generate crude barium sulfide containing about 60% of barium sulfide;
[0024] (b) Put the above-mentioned crude barium sulfide into the leaching tank and soak it in hot water at 80°C to prepare a solution containing 114g / L barium sulfide, and adjust the temperature to 67°C, mix the barium sulfide solution with excess sulfuric acid (industrial sulfuric acid, 98%) is added in the continuous reactor simultaneously and reacts to generate barium sulfate slurry and hydrogen sulfide, and the adding rate of barium sulfide solution is 4000L / h, and the concentration of sulfuric acid add-on is 2.7g / L according to the concentration of residual sulfuric acid in the barium sulfate slurry after the completion of the reaction calculate;
[0025] (c) Pass hot air into the barium sulfate slurry to discha...
Embodiment 2
[0029] (a) Grinding and mixing barite and anthracite, putting them into a calcining converter for calcination, the temperature is controlled at 1200° C., and the calcination time is 2 hours to generate crude barium sulfide containing about 60% of barium sulfide;
[0030] (b) Put the above-mentioned crude barium sulfide into the leaching tank and soak it in hot water at 80°C to prepare a solution containing 110g / L barium sulfide, and adjust the temperature to 65°C, mix the barium sulfide solution with excess sulfuric acid (industrial sulfuric acid, 98%) is added in the continuous reactor simultaneously and reacts to generate barium sulfate slurry and hydrogen sulfide, and the adding speed of barium sulfide solution is 3000L / h, and the concentration of sulfuric acid add-on is 12.5g / L according to the concentration of residual sulfuric acid in the barium sulfate slurry after the completion of the reaction calculate;
[0031] (c) Pass hot air into the barium sulfate slurry to disc...
Embodiment 3
[0035] The remaining steps are the same as in Example 2, except that in step (d), after dehydration and washing, the filter cake is dissolved in water to make barium sulfate slurry, and coupling agent KH-560 is added to the barium sulfate slurry.
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