| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide a pretreatment method of copper-containing molybdenite that removes copper alone while minimizing oxidation of molybdenum in reacting low-grade molybdenite containing copper sulfide with sulfuric acid to produce ferromolybdenum for steel making.SOLUTION: Before pretreatment, molybdenite is subjected to ore flotation to separate minerals on the hydrophilic surface leaving the minerals in a solution, and further may be subjected to crushing and granulating to improve reactivity with sulfuric acid. The pretreatment includes a step for mixing the copper-containing molybdenite with sulfuric acid at an equivalence ratio of 0.9-1.8, a step for heating and subjecting the mixture to sulfation reaction at 180-240°C for 20-80 minutes, a step for water exudation by adding water and agitating after the sulfation reaction, a step for separating a solid from a liquid after the water exudation, and a step for drying the separated solid.</p> |
