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AssigneeTokuyama Soda Kabushiki Kaisha
InventorsYukio Mizutani, Yoshiaki Watanabe, Genji Taga
Estimating the term…
A process for producing calcium silicate of the rational formula 2CaO.3SiO.sub.2.nSiO.sub.2.mH.sub.2 O wherein m is a number of more than 0, and n is a number of 0.1 to 10 from a silicate compound and a calcium compound, which comprises contacting a water-soluble silicate compound with a calcium compound in an aqueous medium, and heating them to a temperature of 150.degree. to 250.degree. C., the amount of the aqueous medium being 5 to 100 times the weight of the calcium silicate obtained, and a process for producing calcium silicate or a calcium silicate-gypsum composite, which comprises adding a water-soluble silicate or its aqueous solution gradually to an aqueous suspension of gypsum, and heating the mixture to a temperature of 150.degree. to 250.degree. C. The calcium silicate and the calcium silicate-gypsum composite, which have a structure composed of an assembly of petal-like flakes, are useful as an adsorbent carrier, a delusterant or a filtration aid.
A process for producing calcium silicate of the rational formula 2CaO.3SiO.sub.2.nSiO.sub.2.mH.sub.2 O wherein m is a number of more than 0 and n is a number of 0.1 to 5, said calcium silicate having a petal-like structure, a specific bulk volume of at least 4 cc/g and an amount of oil absorption of at least 2.0 cc/g, which process comprises contacting a water-soluble silicate compound with a calcium compound in an aqueous medium, and heating the resultant mixture at a temperature of 150.degree. to 250.degree. C., the amount of the aqueous medium being 5 to 100 times the weight of the calcium silicate obtained.
A process for producing calcium silicate of the rational formula 2CaO. 3SiO.sub.2.nSiO.sub.2.mH.sub.2 O wherein m is a number of more than 0 and n is a number of 0.1 to 5, or producing a composite of said calcium silicate and gypsum, said calcium silicate and said composite having a petal-like structure, a specific bulk volume of at least 4 cc/g and an amount of oil absorption of at least 2.0 cc/g, which process comprises adding a water-soluble alkali metal silicate or its aqueous solution gradually to an aqueous suspension of gypsum, and heating the mixture at a temperature of 150.degree. to 250.degree. C.
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