Reverse-direct flotation method for siliceous-calcareous collophanite

Abstract

The invention relates to a reverse-direct flotation method for siliceous-calcareous collophanite. According to the method, after raw ore is ground, a flotation process sequentially comprising reverseflotation magnesium removal and direct flotation desilicication operation is adopted, reverse flotation return water enters a reverse flotation water return pool and then returns to reverse flotationmagnesium removal so as to be used, direct flotation return water enters a direct flotation water return pool and then returns to direct flotation desilicication operation, and surplus direct flotation return water is fed into the reverse flotation water return pool so as to be used for reverse flotation. According to the invention, with the method, water can be saved, all wastewater can be recycled, and the treatment cost is low; by using a flotation process sequentially comprising reverse flotation and direct flotation, less water is needed, and reverse flotation return water enters the reverse flotation return water pool and then is reused for reverse flotation; and on the premise that the indexes of the concentrate yield, the grade and the recovery rate are similar to those in the prior art, the dosage of chemicals is small, the ion content of ore pulp in direct flotation operation is low, and water consumption is small.

Description

technical field [0001] The invention belongs to the technical field of mineral processing, and in particular relates to a process for utilizing siliceous-calcareous colloidal phosphate ore stage grinding and reverse flotation return water. Background technique: [0002] In the industrialized production of collophosite, how to effectively realize the utilization of backwater is actually related to the level of new water consumption in the dressing plant and the quality of the mineral processing technical indicators, and it is related to the storage pressure of the tailings reservoir and environmental protection issues. Collophosite positive and negative flotation process is mainly for siliceous calcareous collophosphate. The positive flotation process removes most of the silicate gangue minerals through flotation under alkaline pH conditions, while the reverse flotation process Most of the dolomite and calcite are removed under weakly acidic pH conditions. In the actual prod...

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 the conventional forward and reverse flotation process 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 the positive 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 by the tailings pond is used. Adding fresh water as supplementary water for positive flotation has the disadvantages of high fresh water usage in actual production and high inventory pressure in tailings ponds

At present, the backwater of the tailings pond is routinely used as the supplementary water of the forward flotation process, and the excess Ca carried in the backwater of the reverse flotation 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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