Reverse flotation technology of phosphate ore in alkaline medium

Abstract

The invention relates to a reverse flotation technology of phosphate ore in an alkaline medium. Crushed phosphate ore is crushed and evenly mixed with industrial lime, the mixture enters a grinder and water is added to perform size mixing. Thus, the ore is composed of materials and enters a reverse flotation roughing groove after the ore receives monomer separation. A reverse flotation collecting agent C5-9 soap is used for performing size mixing to carry out reverse flotation roughing and obtain a roughed foam mainly comprising carbonate gangue minerals and one part of roughed phosphorus concentrate products. The roughed foam enters a reverse flotation selection groove, and the industrial lime and the reverse flotation collecting agent C5-9 soap are added for performing size mixing. Reverse flotation selection is carried out and a foam product is tailings, and is discharged and piled up. The other part of the obtained products in the groove are phosphorus concentrate. The concentrate is combined and receives concentration, filtering and drying and the final phosphorus concentrate is obtained. The reverse flotation technology has the advantages of being simple in technological process, easy to operate and control, easy to stably operate, high in separation efficiency, superior in technologic index, high in quality of the obtained phosphorus concentrate, high in yield coefficient, low in cost of final product phosphorus concentrate and the like.

Description

technical field [0001] The invention relates to a phosphate rock beneficiation process, in particular to a reverse flotation process of phosphate rock in an alkaline medium. Background technique [0002] Although the phosphate rock (the main useful mineral is collophosite, and the gangue mineral is carbonate) is of high grade (containing P 2 o 5 The grade is above 30%%), but to meet the requirements of phosphate fertilizer processing, some carbonate minerals must be excluded through ore dressing to obtain qualified phosphate concentrate products. For such ores, sulfuric acid is usually used as a pH regulator and phosphoric acid as an inhibitor of phosphate minerals in industrial production at home and abroad to reverse flotation carbonates in acidic media, so as to obtain qualified phosphorous concentrate products. [0003] Due to the following disadvantages of this acidic medium process: ① The required amount of sulfuric acid is large (9-11kg / t raw ore), the pH value of t...

AI Technical Summary

Problems solved by technology

[0003] Due to the following disadvantages of this acidic medium process: ① The required amount of sulfuric acid is large (9-11kg / t raw ore), the pH value of the slurry is low, and the contact equipment, pipelines, storage tanks, etc. are severely corroded, which is easy to cause leakage. A large amount of calcium-containing compounds can easily form calcium sulfate scaling on the pipe wall, thereby blocking the pipe and preventing normal production

③ It is difficult to utilize the backwater, and reverse flotation for reducing magnesium uses a large amount of sulfuric acid and a certain amount of phosphoric acid, resulting in too much acidic water, which cannot be fully returned to the flotation system for use. It is necessary to treat mineral processing wastewater, and the cost of mineral processing is high

Aiming at the technical and economic problems caused by the above acidic medium, some domestic institutions have used this phosphate rock to do experiments with alkaline medium technology, but the technical indicators of the beneficiation obtained are poor, showing that the concentrate grade or yield is too low