A kind of beneficiation method of high calcium carbonate type low-grade scheelite

Abstract

The invention provides a method for beneficiating high-calcium carbonate low-grade scheelite ore. The method includes: before the raw ore is put into grinding, throwing away the light specific gravity minerals in the ore whose specific gravity is lower than that of scheelite and fluorite; Scheelite fluorite mixed flotation to obtain scheelite fluorite mixed rough concentrate and tailings I; then the scheelite fluorite mixed rough concentrate is separated to obtain high-grade scheelite fluorite-based Mixed concentrate and low-grade scheelite coarse concentrate mainly composed of scheelite calcium carbonate; then the high-grade mixed concentrate mainly composed of scheelite and fluorite is separated by heating and flotation to obtain scheelite concentrate I and fluorite concentrate ore; the low-grade scheelite crude concentrate mainly composed of scheelite calcium carbonate is separated by heating and flotation to obtain scheelite concentrate II and tailings II. The invention avoids the loss of a large amount of easy-floating fluorite in the scheelite heating flotation tailings in the conventional scheelite priority flotation process, and realizes the step-by-step recovery of scheelite and the comprehensive recovery of fluorite.

Description

technical field [0001] The invention relates to the technical field of mineral processing, and more specifically relates to a mineral processing method for high-calcium carbonate type low-grade scheelite. Background technique [0002] Tungsten ore resources mainly include wolframite, scheelite and black and white tungsten mixed ore. Among them, scheelite is often closely associated with calcium-containing minerals such as fluorite and calcite. When flotation recovers scheelite, the relationship between calcium-containing minerals must be considered. separation and comprehensive recovery of fluorite. For CaCO 3 Grade 30%~50%, WO 3 Grade 0.10%~0.50%, CaF 2 High calcium carbonate low-grade scheelite with a grade of 5% to 15%, due to CaCO 3 High grade, WO 3 Grade and CaF 2 The grade is low, the comprehensive recovery rate of scheelite and fluorspar is low or fluorspar cannot be recovered at all by adopting conventional beneficiation process. [0003] At present, the benef...

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Problems solved by technology

[0005] 2) Mixed flotation of scheelite and fluorite-mixed concentrate inhibits scheelite flotation Fluorite-fluorite coarse concentrate regrinding and selection-shaker gravity separation of scheelite coarse concentrate-scheelite concentrate and gravity separation of tungsten concentrate Ore separation acid leaching process (patent publication number CN102489393A): This process is complex, and the particle size of scheelite is generally finer, and the gravity separation index is poor

[0006] 3) Prioritized flotation of fluorite-flotation recovery of tungsten from fluorite tailings (patent publication number CN104084315A): This process is similar to the defects of the preferential flotation of scheelite to suppress fluorite, and the fluorite yield is relatively large. The entrainment of scheelite in fluorite concentrate will inevitably cause the loss of scheelite in fluorite concentrate

[0007] Compared with scheelite and fluorite, calcium carbonate is easier to muddy in the grinding process and the solubility of calcium carbonate in the pulp is higher, resulting in high content of impurity ions in the pulp and a large ore circulation load in the beneficiation process, which deteriorates the separation process. index

However, none of the above three beneficiation processes can well solve the technical problems caused by high calcium carbonate and maximize the recovery of co-associated fluorspar resources

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