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Rational use of magnesite flotation tailings and wastewater

Time:2019-11-08 09:43:49

The flotation plant is a large water-consuming household. A large amount of wastewater is produced during the beneficiation process, which not only wastes resources but also pollutes the environment. Therefore, wastewater utilization is imperative. Making full use of wastewater not only saves water resources, but also solves environmental pollution. How to use these flotation tailings and wastewater?

Mineral processing

The current ore dressing process of a mineral processing plant is as follows: the selected ore is crushed by “three sections and one closed circuit”, the particle size of the fine ore is <15mm, and the qualified fine ore is “closed-circuit” grinding by ball mill and classifier, and the grinding concentration is 70%. The overflow concentration is 30%, the fineness is -0.074mm, and the content is 74%. The qualified slurry flows into the mixing tank, and then the gangue mineral collector and the adjusting agent are added to the slurry. The gangue mineral floats with the foam, after "one coarse two Sweeping "reverse flotation, scraping out 40% of the total tailings, the remaining in the flotation tank is concentrate. The process is simple and easy to operate, and the purity of the obtained concentrate is not up to the requirement of producing high-purity refractory materials. If a higher purity concentrate is obtained, an inhibitor of different gangue minerals and a magnesite collector are added to the slurry, and stirring, slurrying, and temperature adjustment are performed, and the diamond is selected after one "positive flotation". Magnesium concentrate, the remaining in the tank is medium ore.

Tailings utilization

According to the chemical composition and physical properties of magnesite flotation tailings, it can be used to produce refractory materials, building materials, wall coatings and chemical products. The direct production of building materials with raw materials is an effective way to utilize a large number of tailings.

Waste water recycling

Due to different beneficiation processes, the research direction of beneficiation wastewater is different. The use of wastewater in the full reverse flotation process is relatively simple, while the reverse flotation plus positive flotation process is more complicated.

1) The flotation reagent in the wastewater generated by the all-reverse flotation process is relatively simple; the anti-flotation plus gangue mineral collector and the correction agent will not produce the interaction of the agent, but the solid content is high, and the treatment will affect Flotation effect. Therefore, the wastewater can be used as long as it is subjected to precipitation treatment, and the treated wastewater can be used in all the water treatment points of the flotation plant.

2) The flotation reagent in the wastewater generated by the positive flotation process is more complicated, not only the gangue mineral collector and the correction agent added by the reverse flotation, but also the collector, the regulator and the suppression of the positive flotation The agent used in the reverse flotation and positive flotation is completely reversed, and the residual agents in the wastewater act against each other. Therefore, the wastewater should be used for beneficiation. First, the residue treatment should be carried out; instead, the water points that are not affected by the residual chemicals should be found; third, the wastewater from the reverse flotation and the positive flotation should be separately recovered, and the sedimentation treatment can be returned to the original process. At present, economic, feasible and effective methods are only recycled and used separately. The anti-flotation wastewater can be used for ball mill grinding water, classifier water, and reverse flotation foam water; positive flotation wastewater can be used for positive flotation water and positive flotation foam water. It should be noted that the positive flotation wastewater is strictly prohibited from entering the reverse flotation, and the additional fresh water is added to the reverse flotation process.