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:
Jan. 13, 1976
Filed:
May. 13, 1974
Karl-Axel Melkersson, Helsingborg, SW;
Boliden Aktiebolag, Stockholm, SW;
Abstract
The invention relates to a method of purifying sulphuric acid containing mercury in a plant for the production of sulphuric acid according to the contact process which involves drying moist roaster gases containing sulphur dioxide in at least two drying towers where the major part of the water content is absorbed in the first drying tower. The sulphuric acid containing mercury is in a quantity suitably measured to maintain the concentration between 70 and 80 percent by weight led to the first drying tower. To the second drying tower is led a sulphuric acid so that the concentration can be maintained between 95 and 103 percent by weight. The mercury is separated from a partial current from the circulating sulphuric acid in the first drying tower.