A pretreatment method for high-calcium and high-magnesium fine-grained scheelite
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A scheelite, high-magnesium technology, applied in solid separation, mechanical material recovery, recycling technology and other directions, can solve the problems of waste of rare metal resources, large loss of scheelite, low recovery rate, etc. dosage, improving beneficiation efficiency and reducing the amount of ore
Active Publication Date: 2021-12-24
INST OF RESOURCES UTILIZATION & RARE EARTH DEV GUANGDONG ACAD OF SCI
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[0005] However, the method of full flotation after removing magnetic minerals by magnetic separation, due to the agglomeration of minerals and the influence of high-calcium-magnesium-rich gangue minerals, leads to a large loss of scheelite in tailings, low recovery rate, and poor effect. , the obtained scheelite concentrate contains WO 3 less than 20%
[0006] Based on the above reasons, the magnesia skarn-type scheelite, which is high-calcium and high-magnesium fine-grained scheelite, has not been developed and utilized at present, resulting in a waste of rare metal resources.
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Embodiment 1
[0029] Pretreatment of scheelite ore, the composition of scheelite ore is: 0.155% WO 3 , 30% CaCO 3 , 15% MgO, refer to figure 1 , preprocess as follows:
[0030] The first stage of grinding: Add 100 g / ton of sodium hexametaphosphate to the raw scheelite ore (that is, add 100 grams of sodium hexametaphosphate per ton of scheelite ore), and prepare sodium hexametaphosphate into an aqueous solution For adding, the mass percent concentration of the sodium hexametaphosphate aqueous solution is 1%. Then the slurry is adjusted to a mass concentration of 62.5%, and the ore is ground to a scheelite monomer dissociation degree of 70%.
[0031] The first gravity separation and classification: adjust the pulp concentration after grinding to 23.5% of the mass concentration, carry out gravity separation and classification in the spiral chute, and obtain spiral concentrate, spiral medium ore and spiral tailings; the spiral concentrate has a high content of scheelite, and the spiral Tailin...
Embodiment 2
[0039] Pretreatment of scheelite ore, the composition of scheelite ore is: 0.447% WO 3 , 35% CaCO 3 , 28% MgO, refer to figure 1 , preprocess as follows:
[0040] The first stage of grinding: Add 800 g / ton of sodium hexametaphosphate to raw scheelite ore (that is, add 800 grams of sodium hexametaphosphate per ton of scheelite ore), and add sodium hexametaphosphate into an aqueous solution. The mass percent concentration of the sodium phosphate aqueous solution is 0.5%. Then the slurry is adjusted to a mass concentration of 67.5%, and the ore is ground to a scheelite monomer dissociation degree of 78%.
[0041] The first gravity separation and classification: adjust the pulp concentration after grinding to a mass concentration of 28.5%, carry out spiral chute gravity separation and classification to obtain spiral concentrate, spiral medium ore and spiral tailings; spiral concentrate has high scheelite content, spiral Tailings are mainly gangue minerals.
[0042] The second...
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Abstract
The invention belongs to the technical field of mineral processing, and specifically discloses a method for pretreating high-calcium and high-magnesium fine-grained scheelite. In this method, the raw ore of scheelite is ground for the first stage and then subjected to two gravity separation classifications, the primary concentrate and the secondary concentrate are combined for the second stage grinding, and then magnetic separation treatment; the secondary tailings are deslimed to obtain overflow, Enrich the overflow, fine mud and primary tailings to obtain fine mud concentrate; the fine mud concentrate enters magnetic separation treatment; the second stage grinding slurry and fine mud concentrate are combined for magnetic separation treatment to obtain pretreatment concentrate. The pretreatment method of the present invention overcomes the technical problem that fine-grained scheelite is difficult to recycle due to the agglomeration of high-calcium and high-magnesium scheelite, and discards most of the vein minerals and scheelite through pretreatment, reducing the amount of scheelite that enters the subsequent process. The amount of ore in flotation increases the WO in flotation ore 3 The selected grade greatly reduces the amount of chemicals used in subsequent flotation.
Description
technical field [0001] The invention relates to the technical field of mineral treatment, in particular to a pretreatment method for high-calcium and high-magnesium fine-grained scheelite. Background technique [0002] Tungsten is mainly used in the manufacture of various alloy steels. It is an essential element in the production of gun barrels, high-temperature alloys for engines, rocket nozzles, armor-piercing projectiles, electromagnetic guns, etc. It is known as the "King of War Metals" and is an important strategic mineral for the country. resource. my country is rich in tungsten resources, but after years of over-exploitation, the easy-to-mining wolframite resources are close to exhaustion, and scheelite, which accounts for 70% of the country's tungsten resources, has large reserves, but 85% of the resources are due to low grade and particle size. Fine and high recycling cost, so it is difficult to develop and utilize. [0003] Magnesia skarn-type scheelite has the ch...
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Patent Type & Authority Patents(China)
IPC IPC(8): B03B9/00B03B1/00B03B1/04B03B9/06
CPCB03B9/00B03B1/00B03B1/04B03B9/06Y02W30/52
Inventor 邓丽红周晓彤付广钦关通尚兴科
Owner INST OF RESOURCES UTILIZATION & RARE EARTH DEV GUANGDONG ACAD OF SCI
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