How to solve the problem of excessive sulfur in fluorite raw ore?

Fluorite is one of the major sources of fluorine in nature, and fluorspar concentrates are widely used in the chemical, materials and metallurgical industries.

Fluorite is one of the main raw materials of fluoride, mainly associated with sulfide and calcite minerals. The presence of these sulfide and calcite minerals causes pipe blockage and loss of efficiency in the anhydrous hydrofluoric acid production process. Worldwide, direct flotation techniques are used to select fluorspar as a chemical grade, but the separation efficiency of fluorspar, sulfide and calcite remains limited due to their similar buoyancy behavior in fatty acids.

A company uses traditional techniques for beneficiation of fluorite ore, with one roughing and multiple cleanings. The contents of fluorite, pyrite and calcite in the received fluorite concentrate are 93%, 4% and 0.5% respectively. This high content of calcite in the concentrate not only consumes sulfuric acid but also results in the generation of waste volume and heat energy during the furnace reaction of the acidification of the fluorspar concentrate. Dangerous gases with high sulfide content, 2S and SO2 pollute the air.

The method of sulfur removal is to first destroy the collection and foaming performance of fatty acid collectors on fluorite by defoaming-inhibitors, and then activate the sulfide ore in fluorite concentrate by acid, and use anion collectors and cations to collect The collector collects a small amount of sulfide ore and silicate minerals in fluorite concentrate, and then promotes the hydrophobic aggregation of fine sulfide ore through high-speed shearing and stirring, so as to realize the reverse flotation enrichment of sulfide ore and other impurities and the fluorite concentrate of purification and purification. The method is simple, easy to operate and efficient. The sulfide in the fluorite concentrate is completely removed and the loss of the fluorite concentrate is small.