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Symbiotic recovered from porphyry copper ore molybdenite, beneficiation process is summarized in a foreign production practice, several operations including the following:
A copper-molybdenum mixed flotation
The rough selection of porphyry copper ore is carried out by copper-molybdenum mixed flotation. The chemical system mainly collects copper minerals, and the agent for collecting molybdenum is appropriately added to float copper and molybdenum together. After 1-3 times of mixing and selection, a copper-molybdenum mixed concentrate containing 20% ​​or more of copper and 0.2% or more of molybdenum is obtained. The higher the molybdenum content of the ore, the higher the amount of collector of molybdenum. The higher the molybdenum content in the copper-molybdenum mixed concentrate, the higher the recovery rate of the selected molybdenum concentrate and the lower the production cost of molybdenum.
Pretreatment before separation of copper-molybdenum mixed concentrate
Before the separation of copper and molybdenum, it is generally carried out by concentration, de-druging, re-grinding, and sometimes steaming or low-temperature roasting to remove the influence of the agent brought by the mixed concentrate on the separation. For regrind, it is generally necessary to achieve a fineness of 90% - 0.074 mm, so that copper and molybdenum, or molybdenum and gangue can be further dissociated and cause a new mineral surface. In addition to the oxidation of mineral surface agents, steaming or low-temperature roasting also causes slight oxidation of copper minerals, which expands the difference in floatability of copper and molybdenum and facilitates separation.
C copper and molybdenum separation
There are two basic schemes for the separation of copper and molybdenum, namely flotation molybdenum and molybdenum molybdenum.
Flotation and molybdenum suppression: In production, only the Bingham copper plant in the United States now adopts a dextrin-and-molybdenum-copper-copper solution. Due to its complicated process and high cost, the new plant does not use this plan.
Molybdenum and copper: Copper is commonly used as sulfide, cyanide and Knox, and oxidants as different inhibitors of different copper minerals.
D molybdenum selection
This operation is basically similar to the selection of a single molybdenite, mainly to remove impurities and improve the grade and quality of molybdenum. Because copper-molybdenum ore often contains more minerals, and copper and molybdenum are closely related, the selected sections are multi-stage re-grinding and multiple selections. Some of the selection plants such as Brenda and Baghdad are selected 12 times. Connaught selects as many as 14 times.
Impurities of copper, iron, lead and other heavy metals with mineral addition agent inhibits, often treated with chemical processing. Further talcs phyllosilicate clays and aluminum oxide (gum) and carbonaceous gangue minerals are difficult to deal with.
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