Mineral processing technology of refractory molybdenum ores with molybdenite and pyrite in close symbiotic relationship

Abstract

The invention discloses a mineral processing technology of refractory molybdenum ores with molybdenite and pyrite in a close symbiotic relationship, and provides a mineral processing technology which can be used for improving the recovery rate of molybdenum and decreasing the mineral processing cost. The technology comprises the following steps of crushing ores into a crushed material till a grinding feed size of 15mm is realized through a two-stage one-closed-circuit crushing process; implementing a two-stage two-closed-circuit crushing process on the crushed material to obtain ore pulp till 85% of 200-mesh grinding fineness is realized; implementing mixing roughing and third-time scavenging on the ore pulp to obtain qualified tailings; regrinding the roughing concentrates till 85% of 325-mesh fineness, and implementing third-time concentration to obtain bulk concentrates; feeding chemicals into the ore pulp before mixing roughing; feeding chemicals after regrinding and before first concentration; feeding chemicals after first scavenging which follows mixing roughing; feeding chemicals after second concentration which follows the regrinding; implementing separation floatation on mixed concentrates; after the separation floatation, implementing one-time roughing and third-time scavenging to obtain sulfur concentrates; implementing third-time concentration to obtain molybdenum concentrates; feeding chemicals before classification flotation. By applying the technology provided by the invention, the operation is simple, and the cost is lowered.

Description

technical field [0001] The invention relates to the technical field of ore dressing, in particular to a beneficiation process for refractory molybdenum ore with close symbiotic relationship between molybdenite and pyrite. Background technique [0002] The main useful minerals in the ore located in Arukorqin Banner, Inner Mongolia are molybdenite and pyrite, and the gangue minerals include quartz, mica, potassium feldspar, etc. Its main ore properties are shown in Table 1: [0003] Table 1 Analysis results of main chemical components of ore [0004] chemical composition Mo S Fe Cu Pb Zn Content% 0.199 5.66 1.33 0.12 0.04 0.04 chemical composition P C SiO 2 Al 2 o 3 CaO MgO Content% 0.02 0.01 49.50 16.18 0.18 0.36 chemical composition K 2 o Na 2 o As Au* Ag* Content% 4.1 0.74 0.01 0.0...

AI Technical Summary

Problems solved by technology

Process mineralogy research shows that molybdenite accounts for more than 40% of the -0.02mm particle size, mostly in the form of inclusions, and it is difficult for this part of the minerals to achieve monomer dissociation; the current beneficiation process adopts the traditional One-stage grinding, the grinding fineness can only reach -200 mesh, accounting for 60-65%, and the molybdenite monomer dissociation degree is only about 40%;

[0019] 2. Through microscope observation, molybdenite and pyrite have a close symbiotic relationship, and the proportion of inclusions is relatively large, and in the flotation process, both of them are easy-floating minerals, which are not easy to separate; currently, pyrite inhibitors It is difficult to effectively suppress the floating pyrite with only sodium sulfide;

[0020] 3. If the grinding fineness is too high, the slurry viscosity will increase, the flotation effect will be bad, and the dehydration of concentrate is difficult, and the recovery rate of dehydration operation will be reduced; in the past, regrinding was required before the separation of sulfur and molybdenum, and the fineness reached -400 mesh. It accounts for 80%, and after dehydration, the concentration of separation and roughing reaches 30%, the viscosity of the slurry is too high, which brings difficulties to the separation, the separation recovery rate is only 80%, the pressure of the filtration operation is too high, and some fine-grained minerals will be separated under high pressure. It is taken away by water through the filter cloth, and the recovery rate of the press filter is reduced, only 95%

The combined recovery rate is only 33%

[0021] 4. The technological process is long and complicated, requiring many types of chemicals, changing doses, and many dosing points, which is not easy to control, and the cost of beneficiation is relatively high

The ore beneficiation process is long, and the separation of sulfur and molybdenum is relatively complicated. There are too many types of agents used in the past. Collectors include kerosene, butyl xanthate, butylamine black drug, naphthalene, etc. Sodium sulfite, sodium thioglycolate, lime, sodium sulfide, etc., there are as many as 12 kinds of all agents, and the dosage is not fixed, adjust at any time

There are many dosing points, and the dosing is basically done every time the sorting process is performed. The operation is cumbersome and difficult to control.

Moreover, the cost is relatively high, and the cost of mineral processing reaches 80 yuan / t

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