Title: Ore dressing process of oolitic high phosphorus hematite
Application Number: 200610124741 Application Date: 2006.10.12
Publication Number: 1931437 Publication Date: 2007.03.21
Approval Pub. Date: Granted Pub. Date:
International Classifi-cation: B03B7/00;B03C1/005;B03D1/004;B03D101/06;B03D101/02;B03D103/04
Applicant(s) Name: Wuhan Science Address:
Inventor(s) Name:
Attorney & Agent: fanrong
Abstract:
    The ore dressing process of oolitic high phosphorus hematite includes the following steps: roasting crushed oolitic high phosphorus hematite in 80-99 wt% with coal powder as reductant in 1-20 wt% inside a shaft furnace or rotary kiln at 700-1050 deg.c for 0.5-2.5 hr and sealed cooling to room temperature; crushing the roasted hematite, grinding and weak magnetic separation; regulating pH value of the coarse concentrate to 8-12, adding iron ore inhibitor sulfonated starch in 0.5-3.0 kg/ton, activator in 0.2-2.0kg/ton and collecting agent in 0.2-3.0kg/ton and final reverse floatation. The process converts the weak magnetic hematite into strong magnetic mineral, concentrates iron mineral via weak magnetic separation and eliminate P, Si and other impurities in reverse floatation, and can obtain iron concentrate with iron grade higher than 63 %, P content less than 0.15 %, and iron recovering rate over 75 %.
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