Morton M. Wong - Placentia CA Arnold L. Shugarman - Santa Ana CA
Assignee:
Union Oil Co. of California - Los Angeles CA Mono Power Co. - Rosemead CA Southern Pacific Land Co. - San Francisco CA
International Classification:
C01B 3312
US Classification:
423335
Abstract:
A process is provided for reducing the total concentration of heavy metals, notably lead, copper and zinc, naturally occurring in silica-rich sludge precipitated from geothermal brine in a brine handling system such as a geothermal brine electric generating plant. The process includes washing the sludge with hot water to displace any brine entrapped in the sludge, dewatering the washed sludge and leaching the silicious solids residue with hydrochloric acid having a concentration of between about 2 and about 9 weight percent and an acid-to-sludge weight ratio between about 0. 10 and about 0. 33. The acid-sludge mixture is heated to a temperature of at least about 50. degree. and the leaching time is at least about one hour. The leaching solution is separated from the leached sludge and the solids residue are washed with water. Preferably the water used in both washing steps is condensate of steam derived from the geothermal brine.
A method is provided for the removal of lead contaminants from ores and mineral concentrates, comprising leaching the concentrates, at elevated temperatures, with an aqueous solution containing an aminopolycarboxylic acid. After separating the solution from the concentrates, lead can be precipitated by treating the solution with a sulfide; the solution can be recycled for use as a leachant.
Chemistry Instructor at Chapman University, President at ALS Consultng, Inc.
Location:
Orange County, California Area
Industry:
Chemicals
Work:
Chapman University since Sep 2007
Chemistry Instructor
ALS Consultng, Inc. since Feb 2001
President
Unocal / 76 Lubricants Company Jan 1980 - Jun 1999
Principal Scientist
Education:
California Institute of Technology 1964 - 1968
Googleplus
Arnold Shugarman
Lived:
Santa Ana, California Toledo, Ohio Palo Alto / Oakland, CA