Continuous ore grinding reverse-direct flotation method for siliceous-calcareous collophanite

Abstract

The invention relates to a siliceous-calcareous collophanite continuous ore grinding reverse-direct flotation method, which comprises that after crushed raw ore is subjected to two-stage continuous ore grinding classification operation, a flotation process sequentially comprising reverse flotation magnesium removal and direct flotation desilication operation; reverse flotation return water entersa reverse flotation return water pool and then returns to be used for reverse flotation magnesium removal; and direct flotation return water enters a direct flotation return water pool and then returns to the direct flotation desilicication operation, and surplus direct flotation return water is fed into the reverse flotation return water pool to be used for reverse flotation. According to the invention, the method has the advantages of being simple in process, low in investment cost, low in operation effect and cost and the like, effectively avoid the influence of excessive Ca<2+>, PO4<3-> and SO4<2-> carried in reverse flotation return water on phosphorite direct flotation, easily achieves the stable operation of the reverse-direct flotation process in actual production, and achieves lowchemicals consumption, low ion content of ore pulp in direct flotation operation and low water consumotion on the premise that the indexes of the concentrate yield, the grade and the recovery rate are not reduced.

Description

technical field [0001] The invention belongs to the technical field of mineral processing, and in particular relates to a method for continuous grinding and reverse flotation of siliceous-calcareous colloidal phosphate rock. Background technique: [0002] In the industrial production of collophosite positive and negative flotation and reverse flotation, how to effectively realize the utilization of backwater is actually related to the level of new water consumption in the concentrator and the quality of the beneficiation technical indicators, and it is related to the storage pressure of the tailings reservoir and Environmental issues. The positive and negative flotation and reverse flotation processes of collophosphine are mainly for siliceous calcareous collophosphate. The direct flotation process is to remove most of the silicate gangue minerals through flotation under alkaline pH conditions, while The reverse flotation process removes most of the dolomite and calcite und...

AI Technical Summary

Problems solved by technology

In the actual production of the positive and negative flotation plant, it was found that the wastewater of the reverse flotation concentrate has no adverse effect on the reverse flotation process, on the contrary, it can also reduce the use of mixed acid; but the wastewater of the reverse flotation concentrate and the tailings pond If the waste water is directly returned to the positive flotation process, it will cause the instability of the positive flotation process, the deterioration of the beneficiation index, and the increase in the consumption of beneficiation chemicals.

The overflow of the positive flotation tailings thickener is often muddy. When this part of water is returned to the positive flotation process, there will be a phenomenon that the amount of collector agent is increased, but it has little effect on the beneficiation index

[0003] At present, the return water system of conventional forward and reverse flotation generally uses a part of the wastewater from the reverse flotation concentrate to return to the reverse flotation process, and the other part is directly transported to the tailings pond together with the wastewater from the underflow of the reverse flotation tailings thickener. The dense overflow of flotation tailings is directly returned to the positive flotation process, but this part of the backwater cannot meet the needs of the positive flotation process, and a certain amount of new water needs to be added or the backwater returned from the tailings pond is used. Fresh water is used as supplementary water for positive flotation, which has the disadvantages of high fresh water consumption in actual production and high inventory pressure in tailings ponds; Excess Ca carried in flotation backwater 2+ 、PO 4 3- , SO 4 2- It has a very negative impact on the positive flotation of phosphate rock. It is necessary to treat the backwater of the tailings pond before returning to the positive flotation process. The pH control of the return water needs to be very strict, resulting in instability of the positive flotation process

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