Mizusawa Kagaku Kogyo Kabushiki Kaisha

Akira Takahashi

Hiroyuki Naito

Yujiro Sugahara

Yoshibumi Noshi

Hisashi Tuchida

Mamoru Saito

Hisashi Tsuchida

Manshiro Hasegawa

Shoji Shoji

Masanori Ito

A process for the preparation of granules of low-melting-point metals which comprises spouting a melt of a low-melting-point metal in the form of fine streams in a gas phase under melt fracture-causing conditions and introducing the fine streams of the molten metal into a collecting liquid phase so that the speed of the molten metal fine streams just above the liquid face is 50 to 300 cm/sec is disclosed. According to this process, granules having a substantially spherical shape and being uniform in the size can be prepared very easily at high efficiency.

Process for preparation of granules of low-melting-point metals

A lead battery comprising as an active material a formation product of a novel lead monoxide or a heat treatment product thereof is disclosed. This novel lead monoxide has a true density of 8.3 to 9.2 g/cc, an average particle size not larger than 0.2.mu., an infrared absorption peak at a wave number of 1400 to 1410 cm.sup.-1 and a chromic anhydride reactivity of at least 94%. This lead battery is excellent over lead batterys comprising active materials formed from known starting substances with respect to the active material utilization ratio and it has a very long life and stable capacities. In this lead battery, the active material utilization ratio can be maintained at a very high level over a long period.

Process for an electrode for a lead battery

A novel lead monoxide having a true density of 8.3 to 9.2 g/cc, a primary particle size not larger than 0.2 .mu., an infrared absorption peak at a wave number of 1400 to 1410 cm.sup.-1 and a chromic anhydride reactivity of at least 94%. This lead monoxide is of the ultrafine particulate form excellent in light resistance, hue stability and reactivity and is substantially free of metallic lead. Chrome yellow, tribasic lead sulfate, lead silicate, white lead and the like lead salts can be prepared from this lead monoxide without performing a particular washing operation or using a catalyst.

Novel lead monoxide and process for preparation thereof

When phosphate rock and sulfuric acid are mixed under such conditions that gypsum dihydrate is stably formed and sulfuric acid is added to the phosphate rock in an amount not exceeding the amount equivalent to a calcium component in the phosphate rock, small masses of the reaction product between the phosphate rock and sulfuric acid can be maintained in the non-disintegrable form throughout extraction of phosphoric acid from said reaction product, and phosphoric acid can be extracted from such reaction product at a high rate in a good yield.

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Tsuruoka, Japan

Akira Takahashi