Mineralogical characterization of steel industry hazardous waste and refractory sulfide ores for zinc and gold recovery processing

Hagni, A M; Hagni, R D

Title: Mineralogical characterization of steel industry hazardous waste and refractory sulfide ores for zinc and gold recovery processing

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Abstract

The steel industry generates dust as a waste product from high temperature electric arc furnaces (EAF), which is a major step in processing scrap metal into steel. The Environmental Protection Agency (EPA) has classified EAF dust as KO61 hazardous waste, due to its lead, cadmium, and chromium content. The dust also contains valuable zinc, averaging 19%. Detailed mineralogical characterization show the zinc is present as crystals of franklinite-magnetite-jacobsite solid solutions in calcium-iron-silicate glass spheres and as zincite mostly as very small individual spheres. Much of the chromium is present in an insoluble form in solid solution in the iron spinels. This microscopic research is a valuable tool in determining treatment processes for the 600,000 tons of dust generated annually in the US. Refractory gold ores, pyrite and arsenopyrite, have been studied to determine additional, cost-effective methods of processing. One technique under investigation involves roasting sulfide mineral particles to hematite to create porosity through which a leach can permeate to recover the gold. Portlandite, Ca(OH)[sub 2], is added to the roast for retention of hazardous sulfur and arsenic. Modern microscopic and spectroscopic techniques, such electron spectroscopy for chemical analysis, cathodoluminescence microscopy, and electron microprobe, have been applied, as well as reflectedmore »« less

Authors:

Hagni, A M; Hagni, R D ^[1]

Univ. of Missouri, Rolla, MO (United States). Geology Geophysics Dept.

Publication Date:: Fri Apr 01 00:00:00 EST 1994

OSTI Identifier:: 6924600

Report Number(s):: CONF-9404217-
Journal ID: ISSN 0016-7592; CODEN: GAAPBC

Resource Type:: Conference

Journal Name:: Geological Society of America, Abstracts with Programs; (United States)

Additional Journal Information:: Journal Volume: 26:5; Conference: 27. annual conference of the North-Central Section of the Geological Society of America (GSA), Kalamazoo, MI (United States), 28-29 Apr 1994; Journal ID: ISSN 0016-7592

Country of Publication:: United States

Language:: English

Subject:: 58 GEOSCIENCES; 32 ENERGY CONSERVATION, CONSUMPTION, AND UTILIZATION; GOLD ORES; MINERALOGY; ORE PROCESSING; METAL INDUSTRY; WASTE MANAGEMENT; MINERAL WASTES; WASTE PRODUCT UTILIZATION; ZINC ORES; HAZARDOUS MATERIALS; HEALTH HAZARDS; SCRAP METALS; SMELTERS; WASTE PROCESSING; ELEMENTS; HAZARDS; INDUSTRY; MANAGEMENT; MATERIALS; METALS; ORES; PROCESSING; SCRAP; SOLID WASTES; WASTES; 580000* - Geosciences; 320305 - Energy Conservation, Consumption, & Utilization- Industrial & Agricultural Processes- Industrial Waste Management

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                    Hagni, A M, and Hagni, R D. Mineralogical characterization of steel industry hazardous waste and refractory sulfide ores for zinc and gold recovery processing.  United States: N. p., 1994. 
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                    Hagni, A M, & Hagni, R D. Mineralogical characterization of steel industry hazardous waste and refractory sulfide ores for zinc and gold recovery processing.  United States.

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                    Hagni, A M, and Hagni, R D. 1994.  
        "Mineralogical characterization of steel industry hazardous waste and refractory sulfide ores for zinc and gold recovery processing".  United States.

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@article{osti_6924600,

  title        = {Mineralogical characterization of steel industry hazardous waste and refractory sulfide ores for zinc and gold recovery processing},

  author       = {Hagni, A M and Hagni, R D},

  abstractNote = {The steel industry generates dust as a waste product from high temperature electric arc furnaces (EAF), which is a major step in processing scrap metal into steel. The Environmental Protection Agency (EPA) has classified EAF dust as KO61 hazardous waste, due to its lead, cadmium, and chromium content. The dust also contains valuable zinc, averaging 19%. Detailed mineralogical characterization show the zinc is present as crystals of franklinite-magnetite-jacobsite solid solutions in calcium-iron-silicate glass spheres and as zincite mostly as very small individual spheres. Much of the chromium is present in an insoluble form in solid solution in the iron spinels. This microscopic research is a valuable tool in determining treatment processes for the 600,000 tons of dust generated annually in the US. Refractory gold ores, pyrite and arsenopyrite, have been studied to determine additional, cost-effective methods of processing. One technique under investigation involves roasting sulfide mineral particles to hematite to create porosity through which a leach can permeate to recover the gold. Portlandite, Ca(OH)[sub 2], is added to the roast for retention of hazardous sulfur and arsenic. Modern microscopic and spectroscopic techniques, such electron spectroscopy for chemical analysis, cathodoluminescence microscopy, and electron microprobe, have been applied, as well as reflected light and dark field microscopy, and scanning electron microscopy to determine the mineralogy of the sulfur, arsenic, and iron phases, and the extent of porosity, permeability, and oxidation state of the ore particles at various roasting temperatures. It is concluded that mineralogical techniques can be effectively applied to the solution of environmental problems.},

  doi          = {},

  url          = {https://www.osti.gov/biblio/6924600},
  journal      = {Geological Society of America, Abstracts with Programs; (United States)},

  issn         = {0016-7592},

  number       = ,

  volume       = 26:5,

  place        = {United States},

  year         = {Fri Apr 01 00:00:00 EST 1994},

  month        = {Fri Apr 01 00:00:00 EST 1994}

}

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