Beneficiation method for high-calcium-carbonate low-grade scheelite

Abstract

The invention provides a beneficiation method for high-calcium-carbonate low-grade scheelite. The method includes the steps: discarding low-specific-gravity minerals with the specific gravity lower than that of scheelite and fluorite in ore before feeding the raw ore into a mill; firstly, performing scheelite-fluorite bulk flotation on ore pulp obtained after ore milling to obtain rough scheelite-fluorite bulk concentrate and tailings I; then, performing fine separation on the rough scheelite-fluorite bulk concentrate to obtain high-grade bulk concentrate with scheelite-fluorite as the main component and low-grade rough scheelite concentrate with scheelite-calcium carbonate as the main component; then, performing heating flotation separation on the high-grade bulk concentrate with the scheelite-fluorite as the main component to obtain scheelite concentrate I and fluorite concentrate; and performing heating flotation separation on the low-grade rough scheelite concentrate with the scheelite-calcium carbonate as the main component to obtain scheelite concentrate II and tailings II. The method avoids the situation that a lot of easy-to-float fluorite is lost in scheelite heating flotation tailings in a conventional scheelite preferential flotation process, and stepwise recovery of the scheelite and comprehensive recovery of the fluorite are achieved.

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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