CN101269352B - Beneficiation method for black and white tungsten fine deposit - Google Patents

Abstract

The invention relates to an ore dressing method for black-and-white tungsten fine deposit. The method is characterized in that: (1) gravity concentrate and gravity tailings are obtained by gravity desliming; (2) sulphide concentrate and sulphide ore flotation tailing are obtained by sulphide flotation; (3) the mixed flotation of black-and-white tungsten is performed, the sulphide ore flotation tailing is added with a regulator such as sodium carbonate, sodium silicate, aluminum sulfate, and lead nitrate, and is also added with a collector such as sulfating nascent soap; black-and-white tungsten mixed flotation concentrate and black-and-white mixed flotation tailing are obtained after one-time rough flotation, two or three times of fine flotation and two or three times of scavenging. The method provided by the invention is characterized in that the recovery process of the black-and-white tungsten fine deposit is simple, the flotation process of mixed black-and-white tungsten is stable,the recovery rate of tungsten is high and the cost of the dose is low. The method is suitable for the black-and-white tungsten fine deposit of which the content WO3 ranges from 0.10 to 0.50 percent, the WO3 is less than 30 micrometers and metals account for no less than 60 percent.

Description

A kind of beneficiation method of black and white tungsten fine mud

technical field

The invention relates to a beneficiation method for recovering black and white tungsten minerals from black and white tungsten fine mud.

Background technique

my country is rich in tungsten resources, and its reserves and output both rank first in the world. At present, the key to the total recovery rate of tungsten in various tungsten processing plants is the recovery of tungsten fine sludge. China's tungsten fine mud has the characteristics of high yield, high metal content, and fine particle size. It generally accounts for 10-15% of the total ore volume of Longlong, the WO ₃ content is 0.15-0.5%, and the metal content of WO ₃ accounts for the total WO ₃ of the original ore The metal occupancy rate of WO ₃ in the fine mud is less than 74 microns is 85-99%, and the occupation rate of WO ₃ metals in the fine mud is more than 60%. poor effect. According to statistics, the recovery rate of black and white tungsten fine sludge in the current dressing plant is only 20-30%, and the grade is 15-30%. Therefore, improving the separation index of black and white tungsten fine sludge is the key to improving the total recovery rate of tungsten beneficiation.

At present, the beneficiation methods of black and white tungsten fine mud include: classification-gravity separation-flotation-magnetic separation and full floatation.

The classification-gravity separation-flotation-magnetic separation method is to classify the black and white tungsten fine mud with a two-stage cyclone, then use a fine mud carving groove shaking table for rough separation and enrichment for particles larger than 30 microns, and float the concentrate on the shaking table The tungsten concentrate is obtained by desulfurization and then concentrated by shaking table. The particle size of less than 30 microns is roughed by centrifuge, selected by vibrating belt chute, and then magnetically separated by flotation desulfurization to obtain low-grade tungsten concentrate. The disadvantage of this method is that the tungsten ore product does not realize the separation of black tungsten mineral and scheelite mineral, and black tungsten mineral and scheelite mineral coexist in low-grade tungsten products. This method not only has complex process, many types of equipment and high precision requirements, but also has poor adaptability to industrial production, and the recovery effect of black and white tungsten fine sludge is poor.

The full float method is to directly flotation the black and white tungsten fine mud, remove the sulfide minerals, and then carry out the black and white tungsten mixed flotation. mine. The process of this method is simple, but because the tungsten metal in the black and white tungsten fine mud has a particle size of less than 30 microns, the occupancy rate exceeds 60%, and the mineral content of mica, calcite, fluorite, and kaolin in the black and white tungsten fine mud is as high as 30-45%, and these Minerals have good buoyancy, which results in a large amount of black and white tungsten mixed flotation ore recycling, low grades of black and white tungsten mixed flotation concentrates, large separation volumes of black and white tungsten mixed flotation concentrates, and large amounts of chemicals.

Chinese Patent No. 200410051961.1 discloses a beneficiation method of black and white tungsten minerals. This method crushes and grinds raw ore that usually contains 0.2% to 2.0% of WO ₃ and the ratio of black and white tungsten is 1:9 to 9:1, and then undergoes weak magnetic separation. After removing iron minerals and sulfide ores by flotation to remove sulfide minerals, a certain amount of benzohydroxamic acid and sulfated oleic acid soap or Tal soap is added to the tailings as collectors, water glass and aluminum sulfate are Combination of regulators, black and white tungsten mixed flotation, black and white tungsten mixed flotation concentrates are heated and selected to obtain scheelite concentrates, heated and selected tailings are separated by shaker gravity separation and tungsten fine mud flotation operations Obtain black tungsten concentrate and tungsten fine slime concentrate, this method is called GY method for short. When this method is used for mixed flotation of black and white tungsten, the content of WO ₃ in the mixed flotation concentrate of black and white tungsten is similar, but the recovery rate is lower.

Contents of the invention

The object of the present invention is to propose a beneficiation method with good separation effect on black and white tungsten fine mud, high grade of black and white tungsten mixed flotation concentrate, high recovery rate, and low reagent cost.

The mineral processing method of the present invention consists of the following steps accordingly: 1) Gravity separation and desliming: the black and white tungsten fine mud is roughed, selected, and swept to obtain gravity separation concentrate and gravity separation tailings; 2) Sulfide ore floatation Election: Concentrate concentrated ore by gravity separation to 30-45% concentration, sulfide ore flotation to obtain sulfur concentrate and sulfide ore flotation tailings; Add 100-500 grams of regulator sodium carbonate, 500-5000 grams of water glass, 100-2000 grams of aluminum sulfate, 50-1000 grams of lead nitrate to the ore flotation tailings, stir for 1-10 minutes; add collector sulfated oil 50-500 grams of acid soap, stirred for 1-10 minutes; 1 time of roughing, 2-3 times of beneficiation, 2-3 times of sweeping, to obtain black and white tungsten mixed flotation concentrate and black and white tungsten mixed flotation tailings. 50-85% of sulfated oleic acid soap is used for roughing, and 15-50% is used for sweeping.

The characteristics of the present invention are: the recovery process of black and white tungsten fine mud is simple, the mixed flotation process of black and white tungsten is stable, the recovery rate of tungsten is high, the cost of reagents is low, the mineral dressing reagents used have no pollution to the environment, and the tailings water can be reached by simple lime treatment. emissions requirements.

Description of drawings

Fig. 1 is the beneficiation flow chart of the black and white tungsten fine slime of the present invention.

Detailed ways

The black and white tungsten fine mud containing 0.10-0.50% of WO ₃ , 0.013-0.50% of molybdenum, 0.03-0.60% of bismuth, and the metal occupancy rate of WO ₃ of less than 30 microns is ≥ 60% for gravity separation and desliming. One-time roughing, one-time beneficiation and one-time sweeping are composed of three stages of separation. The coarse concentrate of the centrifuge enters the centrifuge for beneficiation, the centrifuge's selected tailings return to the centrifuge for roughing, and the centrifuge's roughing tailings enter the shaker for sweeping. Sweeping concentrated ore by shaking table and concentrated ore by centrifuge are combined into heavy separation concentrate with WO ₃ ≥ 1.5% and recovery rate ≥ 80%. The heavy separation concentrate is concentrated to a concentration of 30-45% by a thickener, and enters the sulfide ore flotation to obtain sulfur concentrate and sulfide ore flotation tailings; Add 100-500 grams of regulator sodium carbonate, 500-5000 grams of water glass, 100-2000 grams of aluminum sulfate, 50-1000 grams of lead nitrate, stir for 1-10 minutes, and then add collector sulfated oleic acid soap 50 ～500g, stirring for 1～10 minutes, after 1 time of roughing, 2～4 times of beneficiation, 2～3 times of sweeping, to obtain WO ₃ 8～20% black and white tungsten mixed flotation concentrate and black and white tungsten mixed flotation Select tailings. 50-85% of sulfated oleic acid soap is used for roughing, and 15-50% is used for sweeping. The black and white tungsten mixed flotation concentrate is heated and selected to obtain scheelite concentrate, and the heated and selected tailings are re-selected to obtain black tungsten concentrate.

Example 1

The black and white tungsten fine mud contains 0.37% WO ₃ , the metal occupancy rate of WO ₃ in particle size less than 30 microns is 67%, and the ratio of black and white tungsten is 6:4. The black and white tungsten fine mud is deslimed by gravity separation, and the obtained gravity concentrate is concentrated to a concentration of 35% by a thickener, and then sulfide ore flotation is carried out. Sulfide ore flotation tailings were added with adjusting agents sodium carbonate, water glass, aluminum sulfate and lead nitrate according to the reagent system in Table 1, and stirred for 8 minutes. After adding collector sulfated oleic acid soap and stirred for 6 minutes, mixed flotation of black and white tungsten was carried out. After 1 time of roughing, 2 times of beneficiation, and 2 times of sweeping, a black and white tungsten mixed flotation concentrate containing 8.29% of WO ₃ was obtained, with a recovery rate of 75.58%.

Example 2

The black and white tungsten fine mud contains 0.3% WO ₃ , and the metal occupancy rate of WO ₃ in particle size less than 30 microns is 73%. The ratio of black and white tungsten is 6:4. After being concentrated to a concentration of 33% by a thickener, sulfide ore flotation is carried out. Sulfide ore flotation tailings according to the pharmaceutical system in Table 1, add regulator sodium carbonate, water glass, aluminum sulfate, lead nitrate, stir for 6 minutes, add collector sulfated oleic acid soap and stir for 7 minutes, then mix black and white tungsten Flotation, after one roughing, three beneficiation, and two sweepings, the black and white tungsten mixed flotation concentrate containing WO ₃ 15.13% was obtained, and the recovery rate was 77.59%.

Example 3

The black and white tungsten fine mud contains 0.21% WO ₃ , the metal occupancy rate of WO ₃ in particle size less than 30 microns is 81%, and the ratio of black and white tungsten is 5:4. After being concentrated to a concentration of 30% by a thickener, sulfide ore flotation is carried out. Sulfide ore flotation tailings according to the pharmaceutical system in Table 1, add regulator sodium carbonate, water glass, aluminum sulfate, lead nitrate, stir for 10 minutes, add collector sulfated oleic acid soap, after stirring for 5 minutes, black and white tungsten Mixed flotation, after 1 roughing, 2 sweeps and 2 beneficiaries, the black and white tungsten mixed flotation concentrate containing 10.63% _WO3 was obtained, and the recovery rate was 73.60%.

It can be seen from Table 1 that for three different black and white tungsten fine slime samples containing 0.10-0.50% WO ₃ , the metal occupancy of WO ₃ in the particle size of less than 30 microns is ≥60%, and the ratio of black and white tungsten is 5:4 to 6:4, By adopting the method of the invention, the black and white tungsten mixed flotation concentrate containing WO ₃ 8-20% is obtained, and the recovery rate is more than 70%.

The black and white tungsten fine mud is deslimed by gravity separation, and the obtained gravity concentrate is concentrated to a concentration of 30-33% by a thickener, and then carried out sulfide ore flotation, and the sulfide ore flotation tailings are mixed with black and white tungsten by GY method By flotation, black and white tungsten mixed flotation concentrate containing 8-20% of WO ₃ is obtained, and the recovery rate is 50-60%. The full float method is to directly carry out sulfide ore flotation on the black and white tungsten fine mud, and the sulfide ore flotation tailings are according to the chemical system of Example 1 in Table 1, adding regulator sodium carbonate, water glass, aluminum sulfate, lead nitrate, and stirring for 10 minutes , add collector sulfated oleic acid soap, stir for 5 minutes, then carry out black and white tungsten mixed flotation, black and white tungsten mixed flotation, the obtained black and white tungsten mixed flotation concentrate contains about 2.73% of WO ₃ , and the recovery rate is only 79.1 %.

The present invention is applicable to black and white tungsten fine mud with _WO3 content of 0.10-0.50 percent and _WO3 metal occupancy of ≥60 percent in particle size less than 30 microns.

Claims (2)

1. A beneficiation method for black and white tungsten fine slime, characterized in that it consists of the following steps: 1) Gravity separation and desliming: the black and white tungsten fine slime is subjected to rough separation, selection, and sweep selection to obtain gravity separation concentrate and Gravity separation tailings; 2) Sulfide ore flotation: Gravity separation concentrate is concentrated to a concentration of 30-45%, and sulfide ore flotation obtains sulfur concentrate and sulfide ore flotation tailings; 3) Black and white tungsten mixed flotation: according to For each ton of fine mud feed, add 100-500 grams of regulator sodium carbonate, 500-5000 grams of water glass, 100-2000 grams of aluminum sulfate, and 50-1000 grams of lead nitrate to the sulfide ore flotation tailings, and stir for 1-2000 grams. 10 minutes; add 50-500 grams of sulfated oleic acid soap as a collector, and stir for 1-10 minutes; after 1 roughing, 2-3 fine selections, and 2-3 sweeps, black and white tungsten mixed flotation extracts are obtained ore and black and white tungsten mixed flotation tailings. 2. The mineral processing method according to claim 1, characterized in that 50-85% of sulfated oleic acid soap is used for roughing, and 15-50% is used for sweeping.

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