| 摘要 |
PURPOSE: To provide a floatation method particularly simple at the time of separating valuable minerals contg., such as copper, lead and zinc, which are raw materials for smelting of nonferrous metals, and gangue minerals, such as pyrite, quartz and feldspar, from mined ores. CONSTITUTION: The oxidation reduction potential of mineral liquid is measured before or after addition of a sulfurous acid gas or sulfurous acid water and the optimum amt. of addition is determined by utilizing a proportional relation existing between the difference between the oxidation and reduction potentials and the grade increasing rate of valuable matter in the method of executing floatation by using the sulfurous acid or sulfurous acid water as a suppressor for controlling the floatability of the pyrite at the time of obtaining the nonferrous metal valuable mineral as concentrate by the floatation method from the ore. The effect of suppressing the pyrite, i.e., the effect of the sulfurous acid to the grade increase of the valuable matter can be judged according to this method without executing laborious analyses and tests. Further, the highest economical effect can be obtd. by the quality control of the concentrate or the curtailment of the useless consumption of reagents, etc., by applying the method to automatic control. |
