CN110013913B - Fluorite combined flotation process for classifying and screening pre-discharged calcium carbonate - Google Patents
Fluorite combined flotation process for classifying and screening pre-discharged calcium carbonate Download PDFInfo
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- CN110013913B CN110013913B CN201910402895.4A CN201910402895A CN110013913B CN 110013913 B CN110013913 B CN 110013913B CN 201910402895 A CN201910402895 A CN 201910402895A CN 110013913 B CN110013913 B CN 110013913B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03B—SEPARATING SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS
- B03B9/00—General arrangement of separating plant, e.g. flow sheets
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03D—FLOTATION; DIFFERENTIAL SEDIMENTATION
- B03D1/00—Flotation
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03D—FLOTATION; DIFFERENTIAL SEDIMENTATION
- B03D2203/00—Specified materials treated by the flotation agents; specified applications
- B03D2203/02—Ores
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Abstract
The invention discloses a fluorite combined flotation process for classifying and screening pre-discharged calcium carbonate, which comprises the following steps: (1) crushing the minerals to be less than 8 mm; (2) screening the finely crushed minerals in the step one by using a 3mm vibrating screen, grinding the products with the particle size of less than 3mm to the particle size of less than-200 meshes and accounting for 80-85%, and discarding the products with the particle size of more than 3mm as tailings; (3) adding an activating agent sodium carbonate, an inhibitor water glass and a collecting agent into the product subjected to ore grinding in the step (2) in sequence for roughing, and keeping the pH value of ore pulp at 8-9 to obtain roughed concentrate and roughed tailings; (4) adding inhibitor water glass into the roughed tailings in the step (3) for scavenging to obtain tailings; (5) and (4) adding inhibitor hydrochloric acid into the rough concentration concentrate obtained in the step (3) to carry out concentration operation to obtain fluorite concentrate. The invention pre-discharges calcium carbonate through grading and screening before flotation, which not only can simplify the flotation production flow, reduce the enrichment of calcium carbonate in the concentrate, but also can increase the flotation separation efficiency and reduce the production cost.
Description
Technical Field
The invention belongs to the technical field of fluorite beneficiation, and particularly relates to a fluorite combined flotation process for screening pre-discharged calcium carbonate in a grading manner.
Background
Fluorite is an important industrial mineral containing fluorine, and the separation of fluorite from calcite is one of the difficulties for workers. At present, two methods are mainly used for sorting high-calcium carbonate fluorite ores, and large gangue minerals such as calcium carbonate and the like are removed by adopting methods such as manual hand selection, manual elutriation and the like for calcium carbonate with coarse embedded granularity; for calcium carbonate type fluorite ore with fine embedded particle size, fine grinding flotation method is usually adopted for separation. However, in actual fluorite ore mining, the embedded particle sizes of gangue such as calcium carbonate and the like are often not single coarse fraction or single fine fraction, fine particle calcium carbonate cannot be removed by methods such as manual selection and the like, and only a flotation process is adopted to enable part of coarse particle calcium carbonate to enter flotation, so that the recovery of fluorite is influenced. Therefore, how to develop a combined ore dressing process which can remove gangue such as coarse particle calcium carbonate and the like and can obtain qualified products through a flotation process becomes a problem to be solved urgently at present.
Disclosure of Invention
In order to solve the problems in the prior art, the invention aims to provide a fluorite combined flotation process for screening pre-discharged calcium carbonate in a grading manner, which can effectively enrich fluorite, realize the effective separation of fluorite, calcium carbonate and other gangue minerals and obtain qualified fluorite concentrate products.
In order to achieve the technical purpose, the invention adopts the following technical scheme:
a fluorite combined flotation process for classifying and screening pre-discharged calcium carbonate comprises the following steps:
(1) crushing the minerals to be less than 8 mm;
(2) screening the finely crushed minerals in the step one by using a 3mm vibrating screen, grinding the products with the particle size of less than 3mm to the particle size of less than-200 meshes and accounting for 80-85%, and discarding the products with the particle size of more than 3mm as tailings;
(3) adding a pH activating agent sodium carbonate, an inhibitor water glass and a collecting agent into the product subjected to ore grinding in the step (2) in sequence for roughing, and keeping the pH of ore pulp at 8-9 to obtain roughed concentrate and roughed tailings;
(4) adding inhibitor water glass into the roughed tailings in the step (3) to carry out scavenging operation to generate final tailings;
(5) and (4) adding inhibitor hydrochloric acid into the rough concentration concentrate obtained in the step (3) to carry out concentration operation, and finally obtaining fluorite concentrate.
According to the technical scheme, the finely-crushed products are classified and screened to pre-remove a part of gangue such as coarse particle calcium carbonate and the like, a pH activating agent sodium carbonate, inhibitor water glass, hydrochloric acid and a collecting agent are used, and through one-time rough concentration, five-time fine concentration and three-time scavenging flotation processes, fluorite can be effectively enriched, the effective separation of fluorite and gangue minerals such as calcium carbonate and the like is realized, and qualified fluorite products are obtained.
Preferably, in the step (1), the mineral is calcium carbonate type fluorite ore, CaF2Grade (L) of a material>10％，CaCO3Grade (L) of a material>15％。
Preferably, in the step (1), products with the size of more than 3mm are screened by a 6mm vibrating screen, the products with the size of 3-6 mm are returned to the step (1), and the products with the size of more than 6mm are discarded as tailings.
Preferably, in step (3), the collector is selected from at least one of oleic acid, saponified oleic acid and sulfonated oleic acid.
Preferably, in the step (3), the using amount of the collecting agent is 500-1500 g/t relative to the adding amount of the ore feeding, the using amount of the water glass is 800-3000 g/t relative to the adding amount of the ore feeding, and the using amount of the sodium carbonate is 500-2000 g/t relative to the adding amount of the ore feeding.
Preferably, in the step (3), the mass fraction of the collecting agent is 5-10%, the mass fraction of the water glass is 5-15%, and the mass fraction of the sodium carbonate is 5-20%.
Preferably, in the step (4), the scavenging times are 1-3 times, and the dosage of the inhibitor water glass in each scavenging process is 0-300 g/t relative to the feeding amount of the ore.
Preferably, in the step (4), the scavenging times are 3, the scavenged concentrate returns to the scavenging operation of the last time in sequence, and the scavenged tailings enter the scavenging operation of the next time to generate final tailings.
Preferably, in the step (5), the mass fraction of the inhibitor hydrochloric acid is 5-10%.
Preferably, in the step (5), the selection times are 5-8 times, and the dosage of the inhibitor hydrochloric acid in each fine selection is 50-200 g/t relative to the feeding amount of the ore.
Preferably, in the step (5), the concentration times are 5, and the concentrated middlings are returned to the previous concentration operation in sequence to finally obtain the fluorite concentrate.
The sodium carbonate, the water glass, the oleic acid, the hydrochloric acid and the like adopted by the invention belong to conventional reagents sold in the market.
Compared with the existing calcium carbonate fluorite beneficiation technology, the technical scheme of the invention has the following effective effects:
(1) the method has the advantages that a large amount of gangue such as calcium carbonate and the like in the calcium carbonate type fluorite ore is thrown off at a coarse particle size, the manual hand separation process can be replaced, the labor intensity of workers is reduced, the content of floating fluorite calcium carbonate is reduced, the loss of the fluorite ore in rough separation operation is reduced, and the ore separation efficiency is improved;
(2) the grade of the selected fluorite is improved, the circulation of calcium carbonate in a concentration process is reduced, gangue minerals such as calcium carbonate and the like are prevented from being mixed into fluorite concentrate, the recovery rate of the fluorite is improved, and the separation difficulty is reduced;
(3) the method has the advantages of simple reagent system, simple process, high separation precision, great reduction of ore dressing cost, small pollution of the used reagent, easy operation, reduction of the pressure of the subsequent environmental protection link and strong practicability.
Drawings
FIG. 1 is a flow diagram of a flotation process of example 1 of the present invention;
figure 2 is a flow diagram of the flotation process of comparative example 1.
Detailed Description
The invention is further illustrated, but not limited, by the following examples.
Example 1
1. Mineral raw materials:
taking a certain fluorite mine raw ore in Hunan province, and CaF in the ore2Grade 21.37% CaCO3The content was 17.83%, and the silicon content was 21.75%. Phase analysis shows that valuable minerals in the ore mainly comprise fluorite, a small amount of associated sulphide ore, and impurities mainly comprise minerals such as quartz, calcite, feldspar, silicate and the like.
2. Operating procedure and technical conditions
Crushing the minerals to be less than 8 mm; and (3) screening the finely crushed minerals in the step one by adopting 3mm and 6mm vibrating screens, feeding products with the particle size of less than 3mm into ball milling equipment, screening products with the particle size of more than 3mm by 6mm, and discarding the products with the particle size of more than 6mm as tailings 1. The product after ball milling requires-200 meshes to account for 80-85%, then the product enters flotation equipment, the pH value of ore pulp is kept at 8-9, 1200g/t of sodium carbonate (mass fraction is 10%), 1000g/t of water glass (mass fraction is 10%) and 800g/t of oleic acid (mass fraction is 10%) are added in sequence relative to ore feeding to carry out roughing operation, and rougher concentrate and rougher tailings are obtained. Adding inhibitor water glass into the rougher tailings to perform scavenging operation for three times, wherein the mass fraction of the water glass is 10%, returning scavenged concentrate to the previous operation in sequence, and performing scavenging operation on the scavenged tailings next time to generate final tailings. And adding calcium carbonate inhibitor hydrochloric acid into the rough concentrate to carry out five times of concentration operation, wherein the mass fraction of the hydrochloric acid is 5%, and the concentrated middlings are returned in sequence to finally obtain qualified fluorite concentrate, and the flotation result is shown in table 1. The dosage of the selected hydrochloric acid and the dosage of the scavenging water glass are as follows:
table 1 flotation results of the novel process of the invention
Comparative example 1
1. Mineral raw materials:
taking a certain fluorite mine raw ore in Hunan province, and CaF in the ore2Grade of 30.19% CaCO3The content was 15.83%, and the silicon content was 21.75%. Phase analysis shows that valuable minerals in the ore mainly comprise fluorite, a small amount of associated sulphide ore, and impurities mainly comprise minerals such as quartz, calcite, feldspar, silicate and the like.
2. Operating procedure and technical conditions
The method comprises the steps of performing ball milling on minerals until the minerals account for 80-85% in a-200-mesh mode, then enabling the minerals to enter flotation equipment, keeping the pH value of ore pulp at 8-9, and adding 1200g/t of sodium carbonate (mass fraction is 10%), 1000g/t of water glass (mass fraction is 10%) and 800g/t of oleic acid (mass fraction is 10%) in sequence relative to ore feeding to perform roughing operation, so that roughed concentrate and roughed tailings are obtained. Adding inhibitor water glass into the rougher tailings to perform scavenging operation for three times, wherein the mass fraction of the water glass is 10%, returning scavenged concentrate to the previous operation in sequence, and performing scavenging operation on the scavenged tailings next time to generate final tailings. And adding calcium carbonate inhibitor hydrochloric acid into the rough concentrate to carry out five times of concentration operation, wherein the mass fraction of the hydrochloric acid is 5%, and the concentrated middlings are returned in sequence to finally obtain qualified fluorite concentrate, and the flotation result is shown in table 2. The dosage of the selected hydrochloric acid and the dosage of the scavenging water glass are as follows:
TABLE 2 flotation results of the calcium removal process without classifying screen
Those of ordinary skill in the art will understand that: the invention is not to be considered as limited to the specific embodiments thereof, but is to be understood as being modified in all respects, all changes and equivalents that come within the spirit and scope of the invention.
Claims (9)
1. A fluorite combined flotation process for classifying and screening pre-discharged calcium carbonate is characterized by comprising the following steps:
(1) crushing the minerals to be less than 8 mm;
(2) screening the minerals finely crushed in the step one by using a 3mm vibrating screen, grinding the products with the particle size of less than 3mm to the particle size of less than-200 meshes and accounting for 80% -85%, screening the products with the particle size of more than 3mm by using a 6mm vibrating screen, returning the products with the particle size of 3-6 mm to the step (1), and discarding the products with the particle size of more than 6mm as tailings;
(3) adding a pH activating agent sodium carbonate, an inhibitor water glass and a collecting agent into the product subjected to ore grinding in the step (2) in sequence for roughing, and keeping the pH of ore pulp at 8-9 to obtain roughed concentrate and roughed tailings;
(4) adding inhibitor water glass into the roughed tailings in the step (3) to carry out scavenging operation to generate final tailings;
(5) and (4) adding inhibitor hydrochloric acid into the rough concentration concentrate obtained in the step (3) to carry out concentration operation, and finally obtaining fluorite concentrate.
2. The fluorite combined flotation process for classifying and screening pre-discharged calcium carbonate according to claim 1, characterized in that: step (1)Wherein the mineral is calcium carbonate type fluorite ore, CaF2Grade (L) of a material>10%，CaCO3Grade (L) of a material>15%。
3. The fluorite combined flotation process for classifying and screening pre-discharged calcium carbonate according to claim 1, characterized in that: in the step (3), the collector is selected from at least one of oleic acid, saponified oleic acid and sulfonated oleic acid.
4. The fluorite combined flotation process for classifying and screening pre-discharged calcium carbonate according to claim 1, characterized in that: in the step (3), the using amount of the collecting agent is 500-1500 g/t relative to the adding amount of ore feeding, the using amount of the water glass is 800-3000 g/t relative to the adding amount of ore feeding, and the using amount of the sodium carbonate is 500-2000 g/t relative to the adding amount of ore feeding.
5. The fluorite combined flotation process for classifying and screening pre-discharged calcium carbonate according to claim 1, characterized in that: in the step (3), the mass fraction of the collecting agent is 5-10%, the mass fraction of the water glass is 5-15%, and the mass fraction of the sodium carbonate is 5-20%;
in the step (5), the mass fraction of the hydrochloric acid is 5-10%.
6. The fluorite combined flotation process for classifying and screening pre-discharged calcium carbonate according to claim 1, characterized in that: in the step (4), the scavenging times are 1-3 times, and the using amount of the inhibitor water glass in each scavenging process is 0-300 g/t relative to the adding amount of the feeding ore.
7. The fluorite combined flotation process for classifying and screening pre-discharged calcium carbonate according to claim 6, characterized in that: in the step (4), the scavenging times are 3, the scavenged concentrate returns to the scavenging operation of the last time in sequence, and the scavenged tailings enter the scavenging operation of the next time to generate final tailings.
8. The fluorite combined flotation process for classifying and screening pre-discharged calcium carbonate according to claim 1, characterized in that: in the step (5), the selection times are 5-8 times, and the dosage of the inhibitor hydrochloric acid in each fine selection is 50-200 g/t relative to the feeding amount.
9. The fluorite combined flotation process for classifying and screening pre-discharged calcium carbonate according to claim 8, characterized in that: in the step (5), the concentration times are 5 times, and the concentrated middlings are returned to the previous concentration operation in sequence to finally obtain fluorite concentrate.
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Families Citing this family (6)
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| CN110560257A (en) * | 2019-09-17 | 2019-12-13 | 长沙三博矿业科技有限公司 | Beneficiation method for recovering associated fluorite from multi-metal tailings |
| CN111330740B (en) * | 2020-03-05 | 2021-10-15 | 中南大学 | Method for improving flotation separation efficiency of magnesium-containing layered silicate minerals and copper sulfide minerals |
| CN113522517B (en) * | 2021-07-15 | 2023-03-24 | 中化地质矿山总局地质研究院 | Fluorite ore beneficiation method |
| CN114100843B (en) * | 2021-11-02 | 2023-10-20 | 湖南有色郴州氟化学有限公司 | Low-grade fluorite carbon reduction and quality improvement method |
| CN114602644B (en) * | 2022-03-14 | 2023-08-18 | 中国地质科学院郑州矿产综合利用研究所 | Regrinding and sorting method for fluorite ore high-grade middlings |
| CN114618649B (en) * | 2022-03-21 | 2023-04-11 | 中南大学 | Method for selecting ore enrichment platinum group metal from spent automobile catalyst |
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