Roasting and Magnetic Separation of a Blende-Marcasite Concentrate

The American Institute of Mining, Metallurgical, and Petroleum Engineers

H. O. Hofman H. I. NORTON

Organization:: The American Institute of Mining, Metallurgical, and Petroleum Engineers
Pages:: 20
File Size:: 701 KB
Publication Date:: Mar 1, 1905

Abstract

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ZINC smelters in the central western. States have established a very high standard of purity for blende-concentrates, viz., zinc 60, iron less than 3, and lead less than 1 per cent. The very low percentage of iron is made possible by the blende containing less than 0.5 percent of isomorphous iron sulphide and by the sparing occurrence of pyritic material in the large blende-deposits of southwestern Missouri and southeastern Kansas. The blende in these districts occurs in sub-Carboniferous limestone, and is associated with chert, residual clay, calcite, pyrite or rnarcasite and bitumen. The different minerals are coarse and therefore readily separated by mechanical washing from the blende, with the exception of pyrite and marcasite, as blende has a specific gravity of from 3.9 to 4.1, marcasite, from 4.85 to 4.90, and pyrite, from 4.95 to 5.10. The common procedure of dressing the ores is to crush in a breaker, size in a trommel with 0.5-in. holes, pass the over-size through roughing-rolls and then jig the ore, now reduced to 0.5 in. maximum size, in roughing multiple-sieve jigs. The products of these are waste-tailings, sine-discharge coarse concentrates, side-discharge coarse middlings and bottom-discharge fine middlings. The coarse concentrates are sent to the market. The coarse middlings are crushed in middlings-rolls and brought back into the system by feeding into the main trommel. The fine middlings are cleaned upon finishing-jigs. Any pyrite or marcasite present follows the blende and increases the percent-

Citation

APA: H. O. Hofman H. I. NORTON (1905) Roasting and Magnetic Separation of a Blende-Marcasite Concentrate

MLA: H. O. Hofman H. I. NORTON Roasting and Magnetic Separation of a Blende-Marcasite Concentrate. The American Institute of Mining, Metallurgical, and Petroleum Engineers, 1905.

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