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Extraction of gold from carbonaceous ores : pilot plant studies

ผู้แต่ง: Bernard J Scheiner; United States. Bureau of Mines.
สำนักพิมพ์: [Washington, D.C.] : U.S. Dept. of Interior, Bureau of Mines, 1972.
ชุด: Report of investigations (United States. Bureau of Mines), 7597.
ครั้งที่พิมพ์/รูปแบบ:   พิมพ์หนังสือ : สิ่งพิมพ์รัฐบาลแห่งชาติ : ภาษาอังกฤษดูครั้งที่พิมพ์และรูปแบบ
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Oxidation procedures based on the chlorine-hypochlorite system were investigated for improving gold recovery from carbonaceous gold ores. The oxidation pretreatment prior to cyanidation was accomplished by (1) addition of sodium hypochlorite to ore pulp, (2) by addition of chlorine to ore pulp, and (3) by generation of hypochlorite in situ by electrolysis of a brine solution used to pulp the ore. Gold extraction of  อ่านมากขึ้น…
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รูปแบบทางกายภาพเพิ่มเติม Online version:
Extraction of gold from carbonaceous ores.
[Washington, D.C.] : U.S. Dept. of Interior, Bureau of Mines, 1972
(OCoLC)609421162
ขนิดวัสดุ: สิ่งพิมพ์รัฐบาล, สิ่งพิมพ์รัฐบาลแห่งชาติ
ประเภทเอกสาร หนังสือ
ผู้แต่งทั้งหมด : ผู้แต่งร่วม Bernard J Scheiner; United States. Bureau of Mines.
OCLC Number: 10313255
หมายเหตุ As of 02/21/2018, GPO could not validate the distribution status of this title for the FDLP.
At head of title: United States Department of the Interior, Bureau of Mines.
คำอธิบาย: 20 pages : illustrations ; 26 cm.
ชื่อชุด: Report of investigations (United States. Bureau of Mines), 7597.
ความรับผิดชอบ: by B.J. Scheiner [and others].

บทคัดย่อ:

Oxidation procedures based on the chlorine-hypochlorite system were investigated for improving gold recovery from carbonaceous gold ores. The oxidation pretreatment prior to cyanidation was accomplished by (1) addition of sodium hypochlorite to ore pulp, (2) by addition of chlorine to ore pulp, and (3) by generation of hypochlorite in situ by electrolysis of a brine solution used to pulp the ore. Gold extraction of 90 pct was achieved by cyanidation of carbonaceous ore that had been pretreated with 20 lb per ton sodium hypochlorite at 50° C for 4 hours. Similarly, pretreatment of the ore pulp with 35 lb chlorine per ton at 24° to 30° C and 15 hours reaction time resulted in 89-pct gold extraction by subsequent cyaanidation. Concomitant studies showed that electrolyzing the pulp prepared with a brine solution was equally as effective as electrolyzing hypochlorite and chlorine for oxidizing carbonaceous ore constituents that are deleterious to cyanidation. Gold extraction of 90 pct was obtained by electrolysis when 275 lb of ore was treated at 200 amp for 7 hours in an 8- to 10-pct salt solution. Power consumption was in the range of 60 kwhr per ton.

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