The invention relates to a coarse grain reverse floatation
magnesium removal method for
phosphorus ore. The method comprises the following steps of crushing and
grinding low-grade
phosphorus ore, the floatation feeding
granularity constitution satisfies the condition that the
granularity of -200 meshes is lower than 50 percent according to the weight, transferring the ground
phosphorus ore into a floatation
machine stirring trough, mixing the ground phosphorus ore with water to form
slurry with concentration more than 50 percent, wherein the temperature of the ore
slurry is 10 to 30 DEG C, respectively mixing the ore
slurry with an adjusting agent inorganic acid and a reverse floatation mixing capturing agent, carrying out the slurry regulation, replenishing
fresh water, carrying out the reverse floatation systematic operation, wherein a foam product is reverse floatation
tailings, discharging the reverse floatation
tailings to be stacked, a product in the trough is low-
magnesium phosphorus
ore concentrate. The floatation feed is the coarse-particle high-
magnesium phosphorus ore, by optimizing the reverse floatation operation and the chemical
system, on the premise of regulating the slurry at the
high concentration, the coarse-grain magnesium removal effect can be realized by adopting the reverse floatation mixing
trapping agent on the basis of high-concentration slurry, the final magnesium content of the concentrate can be reduced, and the concentrate quality can be improved. The method also has the characteristics of simple flow, good sorting effect and
high magnesium discharging rate.