A New Effective Mineral Processing Method for Scheelite-Fluorite Associated Ore

China's reserve of scheelite-fluorite associated ore is in enormous quantity. This type of ore presents in fine-grained inlays, complex ore composition, and symbiotic with a variety of minerals such as sulfide ore and calcite. calcium-bearing mineral scheelite-fluorite-calcite has a difficulty in flotation, the traditional scheelite flotation process is not good for subsequent fluorite flotation, and the fluorite extraction rate is not high.

Fluorite is one of the key raw materials for the fluorine chemical industry. The long-lasting supply of fluorite is related to the continued development of the world industry. Some western countries have used fluorite as a strategic resource to limit their mining and development. China has also introduced relevant policies and regulations to restrict the production and export of fluorite.

In view of the ore dressing of scheelite-fluorite associated ore, many mineral processing workers have carried out a large number of scientific research, focusing on the recovery rate of scheelite and fluorite through flotation reagents and processes. Although the ore dressing technology of scheelite and fluorite and associated ore has made great progress and breakthrough, there are still many problems in the ore dressing of scheelite and fluorite in industrial production, such as scheelite ore flotation tailings. There are many losses of fluorite, fluorite is poorly floatable, the process of mineral processing is complicated, and the recovery rate is low.

It is difficult to separate the calcium-containing minerals from the traditional fatty acid tungsten-selecting process. The traditional process of “first floating tungsten-post-floating fluorite” or “first floating fluorite after floating tungsten” causes difficulty in the recovery of mineral flotation in the subsequent section, and the recovery rate of tungsten fluorite is low. On the other hand, some scholars have proposed a method of making full use of the similarity of the floatability of calcium-containing minerals, the simultaneous enrichment of tungsten and fluorite, and the efficient separation of tungsten and fluorite. This method can greatly improve tungsten and fluorite. The main processes of resource utilization are:

A tungsten, tin, molybdenum and rhenium polymetallic ore in Hunan, the fluorite content is 11%, the WO3 grade is 0.45%, the calcite content is 7.48%, and the gangue minerals are mainly garnet, magnetite, quartz, mica and diaspore. Wait. The mixed ore flotation of tungsten fluorite is carried out after crushing, grinding, de-ironing and desulfurization of the ore. The desulfurization tailings were adjusted to pH 9.5 by sodium carbonate, and the combined inhibitor 300g/t (water glass, baking gum, tannic acid mass ratio of 10:1:1) was added, stirred for 3 minutes, and then animal oleic acid 200g/t was added. The slurry was stirred for 5 min, and the aerated flotation was carried out. After the “one coarse and two sweeps three fines” flotation process, the tungsten and fluorite mixed concentrate was obtained, and the CaF2 grade was 90.28%, WO3.

The grade is 1.73%, the calcite content is 4.76%, the mixed concentrate is acid-dipped with dilute hydrochloric acid with a mass fraction of 30%, the bottom stream is concentrated, the pH of the slurry is adjusted to 9.8 with sodium carbonate, and the aminotritriphosphonic acid 300g/t is added to inhibit the inclusion. The tungsten mineral floats up. After the flotation separation, the foam product is 98.31% of the fluorite concentrate CaF2 grade, the bottom stream is the tungsten concentrate WO3 grade is 17.670%, and the tungsten and fluorite recovery rates are 86.31% and 84.37%, respectively.

The technical scheme makes full use of the characteristics that the calcium-containing minerals are similar in floatability and difficult to be floated and separated, and the water glass, the baking gum and the tannic acid combination inhibitor and the fatty acid collector are used to simultaneously enrich the two to obtain tungsten. The total mass percentage of minerals and fluorite is more than 90% of tungsten and fluorite mixed concentrate, and the aminophosphonate is used as an inhibitor, which can effectively inhibit the floating of tungsten ore, and achieve efficient separation of tungsten ore and fluorite. Short, simple drug, convenient operation, low labor intensity, low energy consumption, environmental protection and high efficiency, greatly reducing the cost of mineral processing.

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