Flotation composite inhibitor for inhibiting pyrite under low alkalinity and using method thereof

Abstract

The invention provides a flotation composite inhibitor for inhibiting pyrite under low alkalinity and a using method thereof. The flotation composite inhibitor comprises, by weight, 75-85% of CaO, 15-25% of NaClO and 2-5% of sodium humate. According to the flotation composite inhibitor for inhibiting the pyrite under low alkalinity and the using method thereof, the pyrite activated by Cu2+ is inhibited by the composite inhibitor under low alkalinity, and the recycling rate of concomitant gold minerals in ores is improved; in the process of separation of copper and sulphur, activation on the pyrite of the Cu2+ generated by secondary copper minerals containing in ores is obviously relieved, so that the copper and gold in ores can be effectively recycled; in the flotation technology of gold-copper ores, the recycling rate of concomitant gold can be increased by about 2.5%, and gold in copper concentrate is a valuable element; the higher gold grade is, the higher the valuation coefficient is; the higher copper grade is, the higher the sale price is; and the economic benefit of an industry is improved, and the effective use ratio of ore resources is improved.

Description

technical field [0001] The invention belongs to the field of beneficiation flotation inhibitors, and in particular relates to a flotation composite inhibitor for inhibiting pyrite under low alkalinity and a use method thereof. Background technique [0002] China's copper ore resources have the following characteristics in terms of deposit scale, copper grade, ore deposit material composition and geographical distribution, and mining conditions: there are many small and medium-sized ore deposits, and there are few large and super-large ore deposits; there are many lean ore and few rich ore. It is 0.87%; there are many associated ores and few single ores. Among more than 900 ore deposits, single ore accounts for only 27.1%, and comprehensive ore accounts for 72.9%. Copper deposits and associated components are quite valuable for comprehensive utilization. The value of gold, silver, lead, zinc, sulfur, and indium, gallium, cadmium, germanium, selenium, tellurium and other co-a...

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Problems solved by technology

[0007] The above methods have a good effect on the separation of pyrite and copper minerals in ores with different characteristics. However, for copper ores that are accompanied by gold and contain a small amount of secondary copper minerals, pyrite The separation effect of ore and copper minerals is not good, because the secondary copper minerals will produce a certain amount of Cu during the grinding process. 2+ , to activate the pyrite in the ore, which increases the difficulty of copper-sulfur separation. In this case, the pH value of CaO to inhibit pyrite is generally above 12, and the separation effect of copper-sulfur is better. However, under this condition, Due to the large amount of CaO, the gold-containing minerals in the ore will also be suppressed and lost in the tailings, resulting in a low recovery rate of gold in the gold-copper concentrate, resulting in a waste of mineral resources

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