Positive flotation method of low grade refractory phosphate ores

Abstract

The invention relates to a positive flotation method of low grade refractory phosphate ores. The method comprises the following specific steps: 1. crushing and grinding ores: grinding raw ore according to the grinding density of 1:1 to -0.074mm of 55-60% tailings discarding fineness; 2. performing positive flotation: firstly, roughing, namely adding depressant sodium carbonate, big modulus sodiumsilicate and collector ZJ oleic acid composite, stirring to obtain roughing concentrate, roughing middlings and roughing tailings; secondly, concentrating, namely adding big modulus sodium silicate in the roughing concentrate to perform 3-4 times of concentrations and obtain concentrating middlings and phosphorus product concentrate; thirdly, scavenging, namely adding ZJ oleic acid composite in the roughing tailings to perform 2-3 times of scavengings and obtain scavenging middlings and tailings; and 3. regrinding and reprocessing, namely further dissociating ores, and reprocessing to obtain tailings and residual phosphorus concentrate. The invention is characterized in that the ore grinding cost is low, the dosage of reagents is low, the ZJ oleic acid composite is easy to prepare and is convenient to use, the separating effect of phosphorus ores and gangue mineral is obvious, the separation indexes are good, etc; and the method is especially suitable to be used in the flotation of silicon-poor deposition-calcium phosphorite type phosphate ores with a concentration of P2O5 of less than 20%.

Description

1. Technical field [0001] The invention relates to a positive flotation method for low-grade refractory phosphate rock, especially suitable for P 2 o 5 Flotation of less than 20% sedimentary silicon-calcareous phosphorite-like phosphate rocks. 2. Background technology [0002] Low-grade refractory phosphate rock refers to the 2 o 5 <20% of the sedimentary siliceous-calcareous phosphorite-like phosphate rocks are difficult to dissociate monomers of phosphorus minerals and gangue minerals because of their fine particle size, and gangue minerals not only contain silicate minerals , also contains dolomite, calcite and other calcareous minerals with similar buoyancy to apatite, making its sorting complicated and difficult. At the same time, due to the low grade of this kind of phosphate rock, the value of the unit ore is not large. If the cost of beneficiation is high if the complicated process flow and common chemical system are adopted, the economic gain will not be wort...

AI Technical Summary

Problems solved by technology

Although the separation index obtained by this invention is relatively good, it also has the disadvantages of complicated technological process and high beneficiation cost.

The invention patent with the application number of 87101820 discloses a new type of high-efficiency calcium lignosulfonate sulfomethylated derivative of phosphate rock flotation inhibitor, namely L-339, which is used in low-grade refractory phosphate rock flotation, which can achieve very good flotation index, but the preparation process of calcium lignosulfonate sulfomethylated derivatives is complicated, it cannot be purchased on a large scale from the market, and it is difficult to apply in industry

In short, the existing technologies have disadvantages such as complex process, poor sorting effect, and high sorting cost to varying degrees.

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