Apparatus for use in the ammonia soda process or the ammonium chloride soda process
AssigneesToyo Soda Manufacturing Co., Ltd., Nihon Kinzoku Kogyo Kabushiki Kaisha
InventorsYoshiki Nishimura, Kazutaka Sakiyama, Tadao Adachi, Kenji Harada
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Abstract
An apparatus for use in the ammonia soda process or ammonium chloride soda process wherein those parts in contact with the ammoniacal brine, the mother liquor formed in the carbonation tower or the ammonium chloride mother liquor, are made of the austenitic steel consisting essentially of less than 0.05 wt. % of C; 0.1 - 2.0 wt. % of Si; 0.01 - 2.0 wt. % of Mn; 3.0 - 20.0 wt. % of Ni; 15.0 - 30.0 wt. % of Cr; 0.5 - 7.0 wt. % of Mo and the remainder iron.
Claims5
In an apparatus having parts intended for contact with an ammoniacal brine, a mother liquor formed in the carbonation tower of an ammonia soda process, an ammonium chloride soda process solution or an ammonium chloride mother liquor, the improvement wherein the surfaces of said parts comprise an austenitic steel consisting essentially of less than 0.05 wt. % of C;
- 0.1 - 2.0 wt. % of Si;
- 0.01 - 2.0 wt. % of Mn;
- 3.0 - 20.0 wt. % of Ni;
- 15.0 - 30.0 wt. % of Cr;
- 0.5 - 7.0 wt. % of Mo and the remainder iron.
In an apparatus having surfaces intended for contact with an ammoniacal brine, a mother liquor formed in a carbonation tower of an ammonia soda process, ammonium chloride soda process solution, or ammonium chloride mother liquor, the improvement wherein said surfaces comprise a ferrite-austenitic steel consisting of less than 0.03 wt. % of C;
- 0.1 - 2.0 wt. % of Si;
- 0.01 - 2.0 wt. % of Mn;
- 3.0 - 10.0 wt. % of Ni;
- 22.0 - 30.0 wt. % of Cr;
- 0.5 - 5.0 wt. % of Mo;
- 0.05 - 0.30 wt. 1 of N.sub.2 and the remainder iron.
Dependencies are inferred from the claim text.