公开(公告)号：CA2208150A1

公开(公告)日：1998-12-18

申请号：CA2208150

申请日：1997-06-18

Applicant: GOLDCORP INC

Inventor： WILSON WILLIAM JOSEPH ,  PORTER ALVIN LEE

IPC: C01F11/18

Abstract: A method for the manufacture of precipitated calcium carbonate from impure calcium oxide of improved colour is disclosed. The method comprises admixing impure calcium oxide with an aqueous solution consisting essentially of a salt of at least one compound selected from the group consisting of organic amines of the formula RNH2 and alkanolamines of the formula NH2(R1OH), where R and R1 are alkyl groups of 1-4 carbon atoms, and hydrochloric or nitric acid. The solution obtained is treated with a reducing agent e.g. sodium hydrosulphite, separated from insoluble matter and then treated with carbon dioxide or the carbonate of the amine or alkanolamine. Preferably, the amine of the salt and of the carbonate are the same, and the salt is used in at least the stoichiometric amount to dissolve the lime.

公开(公告)号：CA2203210C

公开(公告)日：2005-11-15

申请号：CA2203210

申请日：1997-04-21

Applicant: GOLDCORP INC

Inventor： WILSON WILLIAM JOSEPH ,  PORTER ALVIN LEE

IPC: C01F11/18 ,  C04B2/06

Abstract: A method for the manufacture of precipitated calcium carbonate from impure calcium oxide of improved colour is disclosed. The method comprises admixing impure calcium oxide with an aqueous solution consisting essentially of a salt of at least one compound selected from the group consisting of organic amines of the formula RNH2 and alkanolamines of the formula NH2(R1OH), where R and R1 are alkyl groups of 1-4 carbon atoms, and hydrochloric or nitric acid. The solution obtained is separated from insoluble matter and then treated with carbon dioxide or the carbonate of the amine or alkanolamine. Preferably, the amine of the salt and of the carbonate are the same, and the salt is used in at least the stoichiometric amount to dissolve the lime.

公开(公告)号：CA2237960A1

公开(公告)日：1998-12-18

申请号：CA2237960

申请日：1998-05-19

Applicant: GOLDCORP INC

Inventor： PORTER ALVIN LEE ,  WILSON WILLIAM JOSEPH

IPC: C01F11/18

Abstract: A method for the manufacture of precipitated calcium carbonate from impure calcium oxide of improved colour is disclosed. The method comprises admixing impure calcium oxide with an aqueous solution consisting essentially of a salt of at least one compound selected from the group consisting of organic amines of the formula RNH2 and alkanolamines of the formula NH2(R1OH), where R and R1 are alkyl groups of 1-4 carbon atoms, and hydrochloric or nitric acid. The solution obtained is treated with a reducing agent e.g. sodium hydrosulphite, separated from insoluble matter and then treated with carbon dioxide or the carbonate of the amine or alkanolamine at a temperature of at least 50.degree.C. Preferably, the amine of the salt and of the carbonate are the same, and the salt is used in at least the stoichiometric amount to dissolve the lime.

公开(公告)号：CA2208150C

公开(公告)日：2004-03-23

申请号：CA2208150

申请日：1997-06-18

Applicant: GOLDCORP INC

Inventor： PORTER ALVIN LEE ,  WILSON WILLIAM JOSEPH

IPC: C01F11/18

Abstract: A method for the manufacture of precipitated calcium carbonate from impure calcium oxide of improved colour is disclosed. The method comprises admixing impure calcium oxide with an aqueous solution consisting essentially of a salt of at least one compound selected from the group consisting of organic amines of the formula RNH2 and alkanolamines of the formula NH2(R1OH), where R and R1 are alkyl groups of 1-4 carbon atoms, and hydrochloric or nitric acid. The solution obtained is treated with a reducing agent e.g. sodium hydrosulphite, separated from insoluble matter and then treated with carbon dioxide or the carbonate of the amine or alkanolamine. Preferably, the amine of the salt and of the carbonate are the same, and the salt is used in at least the stoichiometric amount to dissolve the lime.

公开(公告)号：CA2203210A1

公开(公告)日：1998-10-21

申请号：CA2203210

申请日：1997-04-21

Applicant: GOLDCORP INC

Inventor： PORTER ALVIN LEE ,  WILSON WILLIAM JOSEPH

IPC: C01F11/18 ,  C04B2/06

Abstract: A method for the manufacture of precipitated calcium carbonate from impure calcium oxide of improved colour is disclosed. The method comprises admixing impure calcium oxide with an aqueous solution consisting essentially of a salt of at least one compound selected from the group consisting of organic amines of the formula RNH2 and alkanolamines of the formula NH2(R1OH), where R and R1 are alkyl groups of 1-4 carbon atoms, and hydrochloric or nitric acid. The solution obtained is separated from insoluble matter and then treated with carbon dioxide or the carbonate of the amine or alkanolamine. Preferably, the amine of the salt and of the carbonate are the same, and the salt is used in at least the stoichiometric amount to dissolve the lime.