Composite inhibitor and direct flotation method for low-grade refractory phosphate

Abstract

The invention provides a composite inhibitor and a direct flotation method for low-grade refractory phosphate. The composite inhibitor comprises caustic starch and high-modulus water glass, and the specific configuration method is that firstly, starch and NaOH tablets are allocated according to the weight ratio of (3-5): (1-1.5) in the way that the well metered starch is dissolved in clear water of 5-7 m<3> and fully mixed, a sodium hydroxide solution with the concentration of 10-20%, which is dissolved and prepared in advance, is slowly added into the starch solution, and full stirring is performed for reaction for 25-35 min to prepare a caustic starch solution; and secondly, the caustic starch solution and the high-modulus water glass are fully mixed according to the weight ratio of 2: 3 to obtain a composite inhibitor solute. According to the invention, the effect in separating phosphate from gangue minerals is remarkable, the separation index is good, the recovery rate of phosphorus finished ore is about 10% higher than that of the traditional process, and residual phosphate in mineral tailings is low (2-3%). The effect in inhibiting iron and aluminium impurities in slurry is obvious and qualified phosphorus finished ore is provided for preparing superior MAP (monoammonium phosphate) through phosphoric acid by wet process.

Description

technical field [0001] The invention relates to a formula of compound inhibitor and a positive flotation method for low-grade refractory phosphate rock, especially suitable for P 2 o 5 Flotation of < 20% poor sedimentary siliceous-calcareous phosphorite-like phosphate rocks. Background technique [0002] Low-grade refractory phosphate rock refers to the 2 o 5 < 20% of sedimentary siliceous-calcareous phosphorite-like phosphate rocks are difficult to dissociate 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. Simultaneously because the grade of this type of phosphate rock is low, the unit ore value is not big, if adopt complex technical process and common agent system beneficiation cost is high, economically also must lose outweigh the gain....

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.

Application number is that the invention patent of 87101820 discloses a kind of novel and efficient phosphate rock flotation depressant calcium lignosulfonate sulfomethylated derivative namely L-339 is used for low-grade refractory phosphate rock flotation, can reach 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.