Flotation technology of middle-low-grade silica-calcia bearing phosphate rock

Abstract

The invention relates to a flotation technology of a middle-low-grade silica-calcia bearing phosphate rock. The technology is implemented by the following steps that: after collophanite is processed by crushing and ore grinding until monomer separation occurs, a reverse flotation and de-magging system is used for carrying out flotation and de-magging work; desliming is carried out on rough concentrate after the flotation and de-magging process; a coarse ore particle product after desliming enters the reverse flotation and de-magging system to carry out flotation and desilicication work; and a fine ore particle product enters the reverse flotation and de-magging system again and the flotation and de-magging work is carried out on the fine ore particle product again by adding inorganic salt for condensation of fine particles and reducing the rotating speed of a flotation machine impeller. In the prior art, after desliming of the middle-low-grade silica-calcia bearing phosphate rock, lots of fine ore particles can be obtained and the grade is low; and the processed fine ore particles can not added to the concentrate or gangue directly. However, with the technology, the problem that the sludge can not be processed after the desliming work of the dual-reverse flotation process of the middle-low-grade silica-calcia bearing phosphate rock can be solved. Meanwhile, the flotation foam can be improved; the sorting feature can be improved; and the reagent dosage is reduced.

Description

technical field [0001] The invention relates to a beneficiation process of phosphate ore, in particular to a flotation process of medium and low-grade silicon-calcium colloidal phosphate rock. Background technique [0002] Among the world's phosphate rock reserves, more than 70% are sedimentary collophosphine, among which the low- and medium-grade siliceous-calcareous collophosphine is the largest and most difficult to use of this kind of ore. Such ores need to remove both silicate impurities and carbonate impurities during the enrichment process before they can be processed and utilized. Currently available domestic flotation processes are: positive and negative flotation processes and double reverse flotation processes. The shortcomings of the positive and negative flotation process are more prominent: the acidity and alkalinity of the pulp are opposite during flotation, the return water treatment is more difficult, and the temperature is greatly affected during flotation...

AI Technical Summary

Problems solved by technology

The shortcomings of the positive and negative flotation process are more prominent: the acidity and alkalinity of the pulp are opposite during flotation, the return water treatment is more difficult, and the temperature is greatly affected during flotation, etc.

The double-reverse flotation process conforms to the flotation principle of "less flotation suppresses more". During flotation, normal temperature flotation can be carried out under relatively coarse particle size. The biggest limitation of the double reverse flotation process is that the desiliconization collector is greatly affected by the sludge

When the desliming operation is not carried out, the sorting performance is poor, the foam is too much and sticky, and the subsequent process is difficult to carry out

During the desliming operation flotation, the amount of slime coming out is large and the grade is low. This part of the slime can neither be incorporated into the concentrate nor treated as tailings

This severely restricts the application of the double reverse flotation process in industry

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