Mitsubishi Heavy Industries Limited

Mitsubishi Jukogyo Kabushiki Kaisha

Takayuki Maeda

Masakazu Tateishi

Kikuo Tokunaga

Akira Notomi

Yoshihisa Arakawa

Takashi Inami

Iwami Ishihara

Toshiaki Nishio

Tetsuji Yamaguchi

Yoshimi Onitsuka

Yuichi Kojima

Masakazu Matsui

Michimasa Yagi

Ryoji Miki

A powder material for powder plasma build-up welding which exhibits excellent resistance and bending properties comprises C in an amount of 0.06 to 0.15% (% by weight, the same hereinafter), Si in an amount of 0.2 to 1.0%, Mn in an amount of 0.2 to 1.0%, Cr in an amount of 17 to 30%, Nb in an amount of 0.6 to 1.5%, Ni in an amount of not more than 0.5%, and the balance consisting of Fe and unavoidable impurities.

Powder material for powder plasma overlaying and powder plasma overlaying metal

This invention relates to a process for removing sodium chloride and potassium salts, which are impurities concentrated and accumulated in pulp digesting chemicals, from ash collected from a soda recovery boiler. This process comprises the steps of (a) mixing ash collected from the combustion exhaust gas of the soda recovery boiler with water to form a slurry, adjusting the pH of the slurry to 10 or less by the addition of sulfuric acid, adjusting the temperature of the slurry to 20.degree. C. or above, and holding the slurry at that temperature for a sufficient time to cause sodium chloride and potassium salts present in the collected ash to be dissolved in the water; (b) cooling the slurry to a temperature below 20.degree. C. by the addition of ice and/or water so as to precipitate solid matter therefrom; and (c) separating the slurry into solid and liquid components and recovering the solid component while discharging the liquid component out of the system.

Process for removing sodium chloride and potassium salts from ash

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Nagasaki, Japan

Takayuki Maeda