Betz Laboratories, Inc.

Terrence W Mattioli

Gary E Geiger

John R Schieber

Suzanne L Kladder

James E Cressman

Glenn D Williams

A method for improving the yield of gold and silver from a Merrill-Crowe recovery process where the presence of copper effects yield. The method involves the addition of a substoichiometric amount of ethylenediaminetetraacetic acid in combination with a phosphonate and polyacrylic copolymer scale control agent. The method also reduces zinc consumption and controls scaling in the stripping circuit.

Method of improving precious metal yield in a Merrill-Crowe recovery

A method for evaluating and/or controlling a blast furnace operation is disclosed wherein the carbon content of off-gases is measured at a test point located downstream of the wet scrubber.

Blast furnace testing and control methods

A test coupon, more particularly a deposition test coupon, for measuring the deposition rate of scale on surfaces in contact with a scale-forming medium such as industrial cooling water.

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King of Prussia, PA, United States of America

Terrence W Mattioli