A mobile sou rce of air poll ution is a mobile device with an in ternal combustion engine or other propulsion engine that pollut es the air . The air is polluted by the.
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2000-3-10The next operation, i. e., the extraction of the ore, is performed either by centrifugal power or by a hydraulic press and water. In this manner we ob- tain a very concentrated lye, from which we precipi- tate the gold either directly by sulphate of iron, or by a treatment with suipho-hydrogen, and subse- quently by sulphate of iron. W. A. Orr.Read More