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Mineral Alterations in Supercritical Water: An Overview of Bureau of Mines Research, Documentation.

PB89164602

Publication Date	1988
Personal Author	Oestreich, J. M.
Page Count	26
Abstract	Supercritical water (SCW) is being tested for commercial use in several organic extraction systems but little work has been done on the extraction of metals from minerals. This lack of information prompted Bureau of Mines (BOM) research into the SCW treatment of minerals. A simple flow-through reactor was built out of high pressure tubing and used to treat minerals with SCW at 400 deg C and 3500 - 7000 psi. The research produced four main conclusions: (1) carbonates of copper, iron, and lead convert to oxides; (2) most iron minerals showed alteration to oxides with some iron dissolution; (3) valuable trace elements including nickel, chromium, and others leached to some extent from sea minerals along with some calcium, iron, silicon, and sulfur; and (4) treatment of sulfides extracted elemental sulfur and resulted in several alteration reactions, though with the exception of cinnabar and the iron bearing minerals, the metals in sulfides were mainly insoluble. Surface alterations on many of the minerals show significant changes have occurred in the minerals even when only minor extractions were detected. These surface effects may be very important when used in conjunction with flotation processes since the SCW treatment may selectively enhance or suppress a mineral's floatability.
Keywords	Extractive metallurgy Beneficiation Metalliferous minerals Metals Leaching Hydrometallurgy Metallography Chemical reactivity Documentation Supercritical fluids
Source Agency	Bureau of Mines
NTIS Subject Category	48A - Mineral Industries 71J - Iron & Iron Alloys 71N - Nonferrous Metals & Alloys 71P - Refractory Metals & Alloys 62 - Computers, Control & Information Theory
Corporate Authors	Bureau of Mines, Salt Lake City, UT. Salt Lake City Research Center.
Supplemental Notes	For system on diskette, see PB89-164594.
Document Type	Technical Report
Title Note	Open file rept. (Final),
NTIS Issue Number	198913

Mineral Alterations in Supercritical Water: An Overview of Bureau of Mines Research, Documentation.

Mineral Alterations in Supercritical Water: An Overview of Bureau of Mines Research, Documentation.
PB89164602

Publication Date	1988
Personal Author	Oestreich, J. M.
Page Count	26
Abstract	Supercritical water (SCW) is being tested for commercial use in several organic extraction systems but little work has been done on the extraction of metals from minerals. This lack of information prompted Bureau of Mines (BOM) research into the SCW treatment of minerals. A simple flow-through reactor was built out of high pressure tubing and used to treat minerals with SCW at 400 deg C and 3500 - 7000 psi. The research produced four main conclusions: (1) carbonates of copper, iron, and lead convert to oxides; (2) most iron minerals showed alteration to oxides with some iron dissolution; (3) valuable trace elements including nickel, chromium, and others leached to some extent from sea minerals along with some calcium, iron, silicon, and sulfur; and (4) treatment of sulfides extracted elemental sulfur and resulted in several alteration reactions, though with the exception of cinnabar and the iron bearing minerals, the metals in sulfides were mainly insoluble. Surface alterations on many of the minerals show significant changes have occurred in the minerals even when only minor extractions were detected. These surface effects may be very important when used in conjunction with flotation processes since the SCW treatment may selectively enhance or suppress a mineral's floatability.
Keywords	Extractive metallurgy Beneficiation Metalliferous minerals Metals Leaching Hydrometallurgy Metallography Chemical reactivity Documentation Supercritical fluids
Source Agency	Bureau of Mines
NTIS Subject Category	48A - Mineral Industries 71J - Iron & Iron Alloys 71N - Nonferrous Metals & Alloys 71P - Refractory Metals & Alloys 62 - Computers, Control & Information Theory
Corporate Authors	Bureau of Mines, Salt Lake City, UT. Salt Lake City Research Center.
Supplemental Notes	For system on diskette, see PB89-164594.
Document Type	Technical Report
Title Note	Open file rept. (Final),
NTIS Issue Number	198913