Method for producing barium sulfate powder and barium sulfate powder
AssigneeSakai Chemical Industry Co., Ltd.
InventorMasayuki ASADA
Life of this patent
Estimating the term…
Abstract
It is an object of the present disclosure to provide a method for inexpensively producing a high-performance barium sulfate powder which is obtained by using inexpensive barium sulfide as a raw material, has a high whiteness degree, and can suppress the generation of volatile components. A method for producing a barium sulfate powder comprising a step of heat treating a raw barium sulfate powders obtained by using barium sulfide as a raw material at 600 to 1300° C., wherein a retention time X (minutes) at a heat treatment temperature of t ° C. is more than time expressed by the following general formula: X (minutes)=A×106×e(−0.015×t) A is 8 or more, and an upper limit of X is 3000 minutes in the formula.
Claims14
A method for producing a barium sulfate powder comprising a step of heat treating a raw barium sulfate powders obtained by using barium sulfide as a raw material at 600 to 1300° C., wherein a retention time X (minutes) at a heat treatment temperature of t ° C. is more than time expressed by the following general formula:
- X (minutes)=A×106×e(−0.015×t)
- A is 8 or more, and an upper limit of X is 3000 minutes in the formula.
A barium sulfate powder which has an L value of 98.3 or more, an a value of −0.5 to 0.5, and a b value of 0 to 0.9 as for powder color, and shows a weight reduction of 0.5 wt % or less after being heated at 900° C. for 30 minutes, and has a sulfur content of 45 ppm or less.
Dependencies are inferred from the claim text.