Washing and direct flotation method of low-grade refractory argillaceous phosphorite

Abstract

The invention relates to a washing and direct flotation method of low-grade refractory argillaceous phosphorite, which is characterized by comprising the following steps: a. phosphorite closed coarse crushing, fine crushing, screening, water washing and fine ore closed wet grinding grading; and b. phosphorite rough separation, twice concentrating, once scavenging direct flotation, thickening and pressure filtration direct flotation. The step a is performed to prepare the phosphorus concentrate for yellow phosphorus production, of which the mass percent of P2O5 is greater than or equal to 25% and the particle size is less than or equal to 25mm, and prepare the phosphorite slurry for phosphoric acid production, extraction and slurry preparation without flotation, of which the content of particles with the particle size of 100 meshes is greater than 85% and the mass percent of P2O5 is 28.5%. By adopting the more-crushing / less grinding-closed screening-washing technique, the method can lower the grinding energy consumption by 10kw.h / t, and has the advantages of obvious separating effect between the phosphorite and gangue mineral and favorable separation indexes. Compared with the traditional technique, the phosphorus concentrate recovery rate is enhanced by 10% or so, and the tailing remaining phosphorus is lowered by 2-3%.

Description

technical field [0001] The invention relates to a method for ore washing positive flotation of low-grade refractory argillaceous phosphate rock, especially suitable for the mass percentage of P 2 o 5 Washing-flotation of <20% poor sedimentary silicon-calcareous phosphorite-like argillaceous phosphate rocks. Background technique [0002] At present, the main methods of processing phosphate rock are flotation, "scrubbing and desliming" process, gravity beneficiation, roasting-digestion process, chemical leaching technology, photoelectric sorting technology, combined beneficiation process, etc. Yunnan Hongfu Chemical Fertilizer Co., Ltd. owns the low-grade refractory argillaceous phosphate rock produced by the Dayangzi Phosphate Mine in Dongchuan District, and its mass percentage is P 2 o 5 <20%, is a typical sedimentary siliceous-calcareous phosphorite-like phosphate rock, because of its fine particle size, the dissociation of phosphorus minerals and gangue minerals i...

AI Technical Summary

Problems solved by technology

[0008] (5) No co-associated elements with comprehensive recycling value were found in the ore

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.

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