公开(公告)号：US3676061A

公开(公告)日：1972-07-11

申请号：US3676061D

申请日：1970-09-21

申请人： KONOSHIMA CHEM CO LTD

发明人： TAGA KOJI ,  NOGUCHI MASAHIKO

IPC分类号： C01B25/237 ,  C01B33/10 ,  C01F7/54 ,  C01B9/08

CPC分类号： C01B25/2375 ,  C01B33/103 ,  C01F7/54

摘要： HIGH PURITY SYNTHETIC CRYOLITE IS PREPARED FROM WET PROCESS PHOSPHORIC ACID SOLUTION THROUGH TREATMENT OF THE SOLUTION WITH AN ALKALI SALT SO AS TO FORM CRYSTALLINE ALKALI FLUOSILICATE, HEATING THE ALKALI FLUOSILICATE THUS OBTAINED WITH CONCENTRATED SULFURIC ACID AND AT LEAST ONE ALKALI SALT SELECTED FROM THE GROUP CONSISTING OF ALKALI CHLORIDE AND ALKALI NITRATE AND ABSORBING THE GAS THEREBY EVOLVED SO AS TO PROVIDE A SOLUTION OF HYDROFLUOSILICIC ACID AND EITHER HYDROCHLORIC OR NITRIC ACID, AND REACTING THIS SOLUTION OF HYDROFLUOSILICIC ACID WITH SODIUM ALUMINATE SOLUTION.

公开(公告)号：US3676062A

公开(公告)日：1972-07-11

申请号：US3676062D

申请日：1970-10-07

申请人： KONOSHIMA CHEM CO LTD

发明人： TAGA KOJI ,  NOGUCHI MASAHIKO

IPC分类号： C01F7/54

CPC分类号： C01F7/54

摘要： SYNTHETIC CRYOLITE FOR USE IN THE REFINING OF ALUMINUM IS PREPARED HAVING LESS THAN 1% SIO2 CONTENT. THE SYNTHESIS IS CARRIED OUT WITH 5-20% OF ONE OR MORE MINERAL ACIDS AT PH 3.5-4.5.