The Tokyo Electric Power Company, Incorporated

Mayekawa Mfg. Co., Ltd.

Asahi Denka Kogyo Kabushiki Kaisha

Asahi Denka Kogyo K.k.

M. Watanabe Co., Ltd.

Kunio Sugiyama

Hiroshi Morita

Hiroyuki Watanabe

Masaki Kusuhara

Keisuke Kasahara

Jinichi Omi

Fujio Komatsu

Kuniaki Kawamura

Masaya Ishikawa

Yuzuru Shindo

Keiko Sanpei

Syoichi Kuroda

Mitsuo Mashimo

Hirofumi Uehara

Soichiro Shibata

Shuichi Tada

Shigetake Kawasaki

Nonyuki Shimamura

Tadahiro Nakada

Seiichi Sakuma

A hydrous silica gel is dehydrated by freezing, thawing, and removing water separated by thawing, thereby yielding silica particles. In addition, the silica particles thus formed is washed and fired, thereby producing a synthetic quartz glass power. A water glass is dealkalized, an oxidizing agent and an acid are added, the mixture thus formed is passed through a hydrogen type cation exchange resin, the aqueous silica solution thus formed is then gelled, and the gelled material is then washed and fired, thereby producing a synthetic quartz powder. Silica is sequentially held for a predetermined time at each temperature range of 150 to 400&#xb0; C., 500 to 700&#xb0; C., and 1,100 to 1,300&#xb0; C., thereby producing a quartz glass.

Method for producing silica particles

A latent heat storage apparatus is provided and a latent heat storage solution therefor stores and retrieves a cool heat substantially in or from a latent heat thereof necessary for air conditioning, cooling, refrigerating, and so forth. The latent heat storage apparatus has an aqueous solution of a plurality of inorganic salts as a latent heat storage solution in a heat storage tank, formed to retrieve a cold heat from a stored latent heat, the latent heat storage apparatus. The latent heat storage solution is formed of (N-1) kinds of inorganic salts in at least an N-component aqueous solution where N.gtoreq.3. The latent heat storage solution stores the cold heat as the latent heat thereof. The cold heat is retrievable from the stored latent heat at a desired temperature almost invariably within a range higher than the N-component eutectic point and lower than any one of binary eutectic points of salts with water. The concentration of each inorganic salt in the aqueous solution is represented in a tortuous eutectic plane including ice point of the N-component equilibria diagram, wherein the concentration range allows the cold heat to be retrieved at the specified temperature almost invariably from the latent heat of ice, binary eutectics with water and inorganic salts, or separated substances.

Latent heat storage apparatus and latent heat storage solution therefor

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Tokyo, Japan

Kunio Sugiyama