Magnetic suspension combined copper-molybdenum separation method

Abstract

The invention provides a method for separating copper-molybdenum bulk concentrate through magnetic suspension in a combined mode. The method comprises the following steps that (1) copper rough concentrate and magnetic separation rough tailings are obtained after copper-molybdenum bulk flotation concentrate is pretreated; (2) mixing the copper rough concentrate with a paramagnetic magnetofluid solution to obtain ore pulp; and (3) the ore pulp is filtered after being subjected to magnetic fluid coupling magnetic separation, first copper concentrate and magnetic separation concentrate tailings are obtained, and filtrate is recycled. According to the method, the copper rough concentrate is subjected to size mixing through the paramagnetic fluid and then is subjected to magnetic fluid coupling magnetic separation, mutual inclusion of chalcopyrite and molybdenite in the magnetic product and the non-magnetic product is reduced, the loss rate of molybdenum in the magnetic product can be remarkably reduced, meanwhile, the yield of the magnetic product is remarkably increased, and the method is suitable for industrial production. And the ore quantity and the flotation reagent dosage of subsequent copper-molybdenum flotation separation are greatly reduced, and the copper-molybdenum separation efficiency and the recovery rate of copper and molybdenum are improved.

Description

technical field [0001] The invention relates to the technical field of mineral processing, in particular to a method for separating copper-molybdenum mixed concentrate with magnetic levitation. Background technique [0002] Molybdenum is an important rare metal with many excellent physical and chemical properties such as high strength, high hardness, good wear resistance and electrical conductivity, and corrosion resistance. It is widely used in high-end alloys, advanced chemicals, electronic appliances, medicine and agriculture This field has a wide range of applications. my country's molybdenum mineral resources are rich in reserves, accounting for about 37% of the world's total reserves, but there are few single molybdenum deposits, most of which are porphyry copper-molybdenum deposits, and the main recovered minerals are chalcopyrite (CuFeS 2 ) and molybdenite (MoS 2 ), some containing chalcocite (Cu 2 S), this type of deposit is usually of low grade, and the mineral ...

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Problems solved by technology

Due to the similar buoyancy of chalcopyrite and molybdenite, the flotation and separation of mixed concentrates is more difficult. The more mature processes in industry mainly include sodium sulfide method and thioglycolic acid method, but these two methods have the following disadvantages: (1) The amount of reagents is large, the process is complicated, and the production cost is high; (2) The use of a large number of flotation reagents makes the COD of mineral processing wastewater high, which is easy to cause environmental pollution and high treatment costs; (3) The separation effect of copper and molybdenum is still not ideal, The operational recovery rate of molybdenum is still low, usually only about 50% to 60%

Using superconducting magnetic separation can usually obtain copper concentrate with high yield and copper recovery rate, but the inclusion of molybdenum is aggravated, and the loss in copper concentrate is also increased, and the separation effect of copper and molybdenum is not very ideal.

[0004] On the whole, there are two main problems in the magnetic separation of copper-molybdenum mixed concentrate: one is that the specific magnetic susceptibility coefficient of chalcopyrite is relatively low, and the particle size is fine, and its magnetic recovery requires a large magnetic field force and requires a high The background magnetic field; the second is that the density of molybdenite is relatively high, reaching 4.7g / cm 3 ~5.0g / cm 3 , in high gradient magnetic separation or superconducting magnetic separation, it is very easy to be included in the magnetic product due to gravity deposition, resulting in the loss of molybdenum

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