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0.18 percent phosphorus 2.95 Composite 3.6 percent 4.4 percent silica agitation batch tests bottle on rolls Bureau of Mines coarse concentrates Composite Heads Composite Roasted heads crude ore crushed crushed to minus-10-mesh desliming and settling Fe SiOo ferrograde product ferromanganese specifications ferromanganese-grade product assaying ferruginous manganese product flotation concentrates flotation tailings ganese half hour heads Unroasted heads hydrogen leached concentrates leached with dilute log-washer Magnetic Nonmagnetic Composite Magnetic separation manganese product assaying manganese was leached mesh Metallurgical Division Minus Mn Fe Si02 Nonmagnetic Composite Roasted nonmagnetic fraction Oxidizing percent alumina percent Assay percent Percentage Percentage of total phosphorus and alumina Pilot-plant test plus-10-mesh concentrates crushed pounds of sodium Product Mn Fe Product percent Mn pulp density recovery of manganese reducing roast remove phosphorus representing Roasted heads Unroasted Rolla Sands Slimes Composite silica and alumina slimes were decanted sodium silicate sulfuric acid TABLE total manganese total Product Mn total Product percent