Direct and reverse flotation technique for high-magnesium low-grade phosphorus ore coarse grains

Abstract

The invention relates to a direct and reverse flotation technique for high-magnesium low-grade phosphorus ore coarse grains. The technique comprises the following steps: crushing and grinding high-magnesium low-grade phosphorus ores; transferring into a flotation machine stirring tank and adding water for mixing slurry; keeping the temperature of the ore slurry at 10-30 DEG C, and then respectively adding regulator sodium silicate and inorganic base into the ore slurry; adding a direct flotation collecting agent for mixing the slurry; adding water for performing direct flotation system operation; transferring a direct flotation foam product into a reverse flotation stirring tank, respectively adding the regulator sodium silicate and reverse flotation mixing collecting agent into the reverse flotation stirring tank, and mixing the slurry without adding fresh water; adding fresh water and performing the reverse flotation system operation; discharging and stacking the foam products which are reverse flotation tailings, wherein the products in the tank are low-magnesium phosphorus ore concentrates; concentrating, filtering and drying, thereby acquiring the end products of concentrates. According to the technique, the last magnesium content of the concentrates is reduced and the quality of the concentrates is increased; the process is simple; the energy consumption for ore grinding is low; the dosage of agents is less; the separation effect is good; the discharging rate of magnesium is high; the water quality of concentrate and tailing is improved.

Description

technical field [0001] The invention relates to a phosphate ore beneficiation process, in particular to a high-magnesium and low-grade phosphate rock coarse-grain forward and reverse flotation process. Background technique [0002] As a non-renewable resource, phosphorus mineral is an essential chemical raw material for the production of phosphate fertilizer and phosphorus chemical products. The increasing level of social and economic development has brought about a sharp increase in the demand for phosphate rock. In my country's existing total reserves of phosphate rock, more than 90% are medium and low-grade phosphate rock, which can only be economically utilized after beneficiation and enrichment. With the depletion of easy-to-mining rich ore and easy-to-select rich ore, the research on the beneficiation technology of medium and low-grade phosphate rock is more important. For high-magnesium and low-grade phosphate rock, because the carbonate impurities are mainly dolomi...

AI Technical Summary

Problems solved by technology

However, with the requirements of marketization and social development, the existing problems and deficiencies of the existing technology are gradually revealed: (1) The particle size of the flotation feed is relatively fine, and the content of -200 mesh often accounts for more than 50%, resulting in a large amount of secondary mud. It not only affects the separation efficiency of flotation, but also causes a large dosage of reagents; (2) the concentration of flotation pulping is low, and the flotation time is long; The equipment is damaged, which also increases the difficulty of treating process water and cannot meet the increasingly stringent environmental protection requirements