The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Oct. 05, 1976
Filed:
Mar. 25, 1974
Applicant:
Inventors:
Thomas Alan Williams, Workington, EN;
Alexander Thomson, Whitehaven, EN;
Assignee:
Albright & Wilson Limited, West Midlands, EN;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
C01B / ;
U.S. Cl.
CPC ...
423320 ; 423167 ;
Abstract
Production of phosphoric acid by the wet process and by-product calcium sulphate hemihydrate. Sulphuric acid reacts with phosphate rock in such conditions that gypsum is precipitated, the resulting slurry is transferred to a second vessel in which the conditions are such that the gypsum recrystallises to calcium sulphate hemihydrate. Calcium sulphate hemihydrate so produced may be converted to cement and sulphuric acid by a process analogous to the anhydrite process for production of sulphuric acid. The phosphoric acid produced may be desulphated in a process integrated with the phosphoric production.