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Title:
METHOD FOR PRODUCING ZINC OXIDE ORE
Document Type and Number:
Japanese Patent JP2016145423
Kind Code:
A
Abstract:
PROBLEM TO BE SOLVED: To provide a method for producing a zinc oxide ore from a raw material ore containing fluorine, in which the fluorine concentration in the zinc oxide ore can be reduced to an extremely low concentration while maintaining the productivity of the zinc oxide ore.SOLUTION: An operation control is carried out for determining whether an exhaust gas dust cake is discharged to the outside of a treatment system or is circulated and charged to a drying-heating furnace or to the upper stream side of the furnace according to the following criteria (i) to (iii): (i) in the initial state, the exhaust gas dust cake is circulated and charged to the drying-heating furnace or to the upper stream side of the furnace, (ii) in the continuation of the circulation and charging, when the total fluorine concentration exceeds a predetermined upper limit discrimination concentration, the exhaust gas dust cake is started to be discharged to the outside of the treatment system, and (iii) in the continuation of the discharge of the exhaust gas dust cake to outside the treatment system, when the total fluorine concentration is less than a predetermined lower limit discrimination concentration, the exhaust gas dust cake is stopped to be discharged to outside the treatment system and started to be circulated and charged.SELECTED DRAWING: Figure 3

Inventors:
KUDO KAZUO
TANABE AKIHIRO
KAIKAKE ATSUSHI
Application Number:
JP2016049244A
Publication Date:
August 12, 2016
Filing Date:
March 14, 2016
Export Citation:
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Assignee:
SUMITOMO METAL MINING CO
International Classes:
C22B19/34; C01G9/02; C22B1/02; C22B7/02; C22B19/38
Domestic Patent References:
JP2004232062A2004-08-19
JP2003147450A2003-05-21
JP2002285255A2002-10-03
JP2004232062A2004-08-19
JP2003147450A2003-05-21
JP2002285255A2002-10-03
Attorney, Agent or Firm:
Masayuki Masabayashi
Hayashi Ichiyoshi