CN110449255B - Fluorite lean ore color separation upgrading-tailing discarding preselection method - Google Patents
Fluorite lean ore color separation upgrading-tailing discarding preselection method Download PDFInfo
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- CN110449255B CN110449255B CN201910666708.3A CN201910666708A CN110449255B CN 110449255 B CN110449255 B CN 110449255B CN 201910666708 A CN201910666708 A CN 201910666708A CN 110449255 B CN110449255 B CN 110449255B
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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
- B03B7/00—Combinations of wet processes or apparatus with other processes or apparatus, e.g. for dressing ores or garbage
Abstract
The invention provides a fluorite lean ore color sorting upgrading-tailing discarding preselection method, which comprises the following steps: (1) crushing the fluorite lean ore through a two-stage one-closed circuit, wherein the crushed product is-15 mm; (2) screening the crushed products to obtain oversize products and undersize products, wherein the size of a sieve pore is 5mm, and feeding the oversize products into a first-stage color separator for fluorite quality improvement and separation to obtain lump ore concentrates; (3) the tailings separated by the first-stage color separator enter a second-stage color separator for tail throwing separation to obtain lump ore tailings and lump ore middling; (4) and (3) mixing the undersize products in the step (2) with the lump ore middling in the step (3), grinding, and then performing flotation. According to the invention, through pre-upgrading and sorting and discarding a large amount of hard minerals in advance, the raw ore amount entering the ball mill is greatly reduced, the selected grade is improved, and the excessive crushing of the hard minerals to fluorite in the ore grinding process is weakened, so that the production cost is reduced, and the sorting quality is improved.
Description
Technical Field
The invention relates to the technical field of fluorite ore dressing, in particular to a fluorite lean ore color dressing upgrading-tailing discarding pre-selection method.
Background
Fluorite is one of the important strategic non-metallic minerals in China and is called as 'second rare earth'. The fluorite resources in China are rich, but the average grade is low, and the fluorite is mostly associated fluorite ore, and the sorting and recycling difficulty is high. The fluorite mineral has low hardness and brittle property, has larger hardness difference with gangue minerals such as silicate and the like, is easy to generate over-grinding and argillization, and is an important reason for difficult acquisition of high-quality fluorite concentrate. At present, the main beneficiation methods of fluorite ore are hand dressing, gravity dressing and flotation. The manual selection is generally used for fluorite ores which are clear in boundary between fluorite and gangue and easy to distinguish by naked eyes, and can sort the fluorite lump ores with better quality in advance to obtain qualified lump ore products, but the manual selection is low in operation rate and high in labor cost and is generally used as an auxiliary means of other selection methods. The gravity separation mainly focuses on the research of a dense medium pre-selection process, the D.WP. type dense medium cyclone is used for pre-selecting fluorite in the countries of south Africa, Italy and the like, most of quartz is removed by a dense medium pre-selection method, so that the ore-selecting grade of the fluorite is improved, and the influence on subsequent ore grinding operation is reduced.
The color sorting is a mineral separation method for automatically sorting out heterochromatic particles in particle materials by utilizing a photoelectric detection technology according to the difference of optical characteristics of the materials, and is used in the field of detection and classification of discrete materials or packaging industrial products and food quality.
Disclosure of Invention
The invention provides a fluorite lean ore color sorting upgrading-tailing discarding pre-selection method, which greatly reduces the amount of raw ore entering a ball mill by pre-upgrading and sorting and discarding a large amount of hard minerals in advance, improves the ore selection grade, weakens the excessive crushing of the hard minerals to the fluorite in the ore grinding process, reduces the production cost and improves the sorting quality.
The technical scheme of the invention is realized as follows: a fluorite lean ore color separation upgrading-tailing discarding pre-selection method comprises the following steps:
(1) crushing the fluorite lean ore through a two-stage one-closed circuit, wherein the crushed product is-15 mm;
(2) screening the crushed products to obtain oversize products and undersize products, wherein the size of a sieve pore is 5mm, and feeding the oversize products into a first-stage color separator to perform fluorite quality improvement and separation through the difference of mineral transparency to obtain lump ore concentrate;
(3) the sorted tailings of the first-stage color sorter enter a second-stage color sorter for tailing discarding and sorting through the difference of the surface colors of the minerals to obtain lump ore tailings and lump ore middlings;
(4) and (3) mixing the undersize products in the step (2) with the lump ore middling in the step (3), grinding, and then performing flotation.
Further, the blocky tailings in the step (3) are qualified tailings which are finally discarded.
Further, the two-section one-closed circuit in the step (1) comprises a first-section coarse crushing, a first-section fine crushing and screening with 15mm sieve holes, and the ore particles with the crushed particle size of +15mm return to the first-section fine crushing.
The lean fluorite ore refers to the grade CaF of the ore in DZ/T0211-20022The lean ore is 20-65%. According to the method, the dissociation degree of the minerals in the fluorite lean ore is improved through two-stage one-closed-circuit crushing, the first-stage color separation is used for upgrading, and the second-stage color separation is used for discarding the waste rock.
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In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a process flow diagram of the fluorite lean ore color separation upgrading-tailing discarding pre-selection method.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be obtained by a person skilled in the art without inventive effort based on the embodiments of the present invention, are within the scope of the present invention.
A fluorite lean ore color separation upgrading-tailing discarding pre-selection method comprises the following steps:
(1) crushing the fluorite lean ore through a two-stage one-closed circuit, wherein the crushed product is-15 mm;
(2) screening the crushed products to obtain oversize products and undersize products, wherein the size of a sieve pore is 5mm, and feeding the oversize products into a first-stage color separator to perform fluorite quality improvement and separation through the difference of mineral transparency to obtain lump ore concentrate;
(3) the sorted tailings of the first-stage color sorter enter a second-stage color sorter for tailing discarding and sorting through the difference of the surface colors of the minerals to obtain lump ore tailings and lump ore middlings;
(4) and (3) mixing the undersize products in the step (2) with the lump ore middling in the step (3), grinding, and then performing flotation.
Further, the blocky tailings in the step (3) are qualified tailings which are finally discarded.
Further, the two-section one-closed circuit in the step (1) comprises a first-section coarse crushing, a first-section fine crushing and screening with 15mm sieve holes, and the ore particles with the crushed particle size of +15mm return to the first-section fine crushing.
The first-stage color sorter utilizes photoelectric equipment to carry out quality improvement and sorting on fluorite according to the transmittance of the mineral; the two-stage color sorter utilizes photoelectric equipment to carry out tailing discarding sorting according to the difference of the surface colors of minerals.
Example (b):
certain low grade fluorite ore, raw ore CaF2The grade was 31.83%, and the main gangue minerals were quartz (content: 35.79%), potassium feldspar (content: 14.84%), sericite (content: 5.19%) and clay mineral (content: 2.52%). The gangue minerals in the fluorite ore are mainly silicate minerals, and the content of primary slime is higher. After the crushing by the two-stage and one-closed circuit, the particle size composition and the distribution of fluorite of the product are shown in the table 1. The sorting results of the screened products (products with the diameter of-15 to +5 mm) after the first-stage color sorting upgrading and the second-stage color sorting tailing discarding are shown in a table 2.
TABLE 1 broken product distribution results
TABLE 2 results of color sorting upgrading-tailing removal
As can be seen from Table 1, the presence of a large amount of the hard silicate minerals causes preferential crushing of fluorite, and CaF of undersize products2The grade is obviously enriched, and the CaF of the product on the sieve2The grade is obviously reduced.
As can be seen from Table 2, the concentrate grade of the oversize product after being upgraded by the primary color sorter is up to 88.13%, and the recovery rate relative to the raw ore is 22.16%. According to the industrial standard (YB/T5217-2005), the quality requirement of the grade FL-85 fluorite lump ore is achieved.
The grade of the lump ore tailings after the tailings are discarded by the secondary color sorter is only 6.82%, the yield of the lump ore tailings is 29.37% relative to the yield of the raw ore, and the recovery rate of the raw ore is only 6.20%, so that a good waste discarding effect is achieved.
The middling product of the lump ore and the undersize product (-5mm product) are merged and then enter a ball mill, and CaF of the middling product2The grade is 36.68 percent, which is improved by 4.85 percent compared with the raw ore. The amount of raw ore entering the ball mill is reduced by 37.50 percentage points.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (3)
1. A fluorite lean ore color separation upgrading-tailing discarding preselection method is characterized by comprising the following steps:
(1) crushing the fluorite lean ore through a two-stage one-closed circuit, wherein the crushed product is-15 mm;
(2) screening the crushed products to obtain oversize products and undersize products, wherein the size of a sieve pore is 5mm, and feeding the oversize products into a first-stage color separator to perform fluorite quality improvement and separation through the difference of mineral transparency to obtain lump ore concentrate;
(3) the sorted tailings of the first-stage color sorter enter a second-stage color sorter for tailing discarding and sorting through the difference of the surface colors of the minerals to obtain lump ore tailings and lump ore middlings;
(4) and (3) mixing the undersize products in the step (2) with the lump ore middling in the step (3), grinding, and then performing flotation.
2. The fluorite lean ore color separation upgrading-tailing discarding pre-selection method according to claim 1, characterized in that the blocky tailings in the step (3) are qualified tailings subjected to final tailing discarding.
3. The fluorite lean ore color separation upgrading-tailing discarding preselection method as claimed in claim 1, characterized in that the two-stage one-closed circuit in the step (1) comprises a stage of coarse crushing, a stage of fine crushing and sieving with 15mm sieve holes, and ore particles with the crushed particle size of +15mm are returned to the stage of fine crushing.
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| CN111250257A (en) * | 2020-03-03 | 2020-06-09 | 浙江兰溪市金昌矿业有限公司 | Separation system and process for fluorite ore containing barite |
| CN113731629A (en) * | 2020-05-29 | 2021-12-03 | 中蓝连海设计研究院有限公司 | Combined beneficiation method for medium-low grade high-silicon phosphorus ore |
| CN112718230B (en) * | 2020-12-11 | 2022-08-09 | 矿冶科技集团有限公司 | Copper oxide ore recovery method |
| CN113042180B (en) * | 2021-03-12 | 2021-11-16 | 中国地质科学院矿产综合利用研究所 | Method for recovering rare earth from heterolite |
| CN113385291B (en) * | 2021-05-27 | 2023-03-14 | 中国地质科学院郑州矿产综合利用研究所 | Method for recovering qualified refractory material raw material from high-iron bauxite clinker waste |
| CN113843183B (en) * | 2021-10-11 | 2023-07-14 | 内蒙古宏鉮科技发展有限责任公司 | Fluorite sorting method for Baiyunebo iron-containing surrounding rock |
| CN115090409A (en) * | 2022-06-16 | 2022-09-23 | 中化地质矿山总局地质研究院 | Ore dressing method for fluorite ore |
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| CN204338316U (en) * | 2014-12-18 | 2015-05-20 | 湖北昌源矿业有限公司 | The Mineral separation device of barite, fluorite, calcite mineral intergrowth |
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| CN106733138A (en) * | 2017-01-13 | 2017-05-31 | 金石资源集团股份有限公司 | Fluorite ore gravity-floatation combined mineral dressing technology |
| CN207787106U (en) * | 2017-12-26 | 2018-08-31 | 合肥谷鑫电子科技有限公司 | A kind of fluorite color selector |
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| CN204338316U (en) * | 2014-12-18 | 2015-05-20 | 湖北昌源矿业有限公司 | The Mineral separation device of barite, fluorite, calcite mineral intergrowth |
| CN105772214A (en) * | 2016-05-09 | 2016-07-20 | 中国地质科学院郑州矿产综合利用研究所 | Mineral separation process for impurity removal and purification of non-metallic ore |
| CN106733138A (en) * | 2017-01-13 | 2017-05-31 | 金石资源集团股份有限公司 | Fluorite ore gravity-floatation combined mineral dressing technology |
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