A pretreatment method for high-calcium and high-magnesium fine-grained scheelite

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...

Examples

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...

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...

Examples

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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