CN108144740B - High-pressure roller grinding superfine coarse grain tailing discarding method applied to ludwigite - Google Patents
High-pressure roller grinding superfine coarse grain tailing discarding method applied to ludwigite Download PDFInfo
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- CN108144740B CN108144740B CN201611101040.0A CN201611101040A CN108144740B CN 108144740 B CN108144740 B CN 108144740B CN 201611101040 A CN201611101040 A CN 201611101040A CN 108144740 B CN108144740 B CN 108144740B
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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
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
- B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
- B02C21/00—Disintegrating plant with or without drying of the material
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Abstract
The invention relates to the technical field of mineral processing, in particular to a high-pressure roller grinding superfine coarse grain tailing discarding method applied to ludwigite.A crushed raw ore material with the particle size of 12-0mm is sent to a high-pressure roller grinder for rolling, the discharge material of the high-pressure roller grinder is mixed with water to form ore pulp, the ore pulp is sent to a wet sieving machine, coarse particles on the sieve are mixed with the raw material and are sent to the high-pressure roller grinder for rolling again, and the sieved ore pulp is a superfine crushed product and is sent to the next process; after the high-pressure roller mill is used for crushing, controlling the granularity of the output material to be 5-0 mm; (2) carrying out coarse grain tailing discarding magnetic separation on the ore pulp obtained in the step (1), and discarding gangue minerals containing surrounding rocks as tailings I; the rest is the selected magnetic concentrate I and enters the next working procedure; the method reduces the beneficiation and processing cost and improves the comprehensive utilization level of the low-grade uranium, boron and iron associated ore.
Description
Technical Field
The invention relates to the technical field of mineral processing, in particular to a low-grade uranium, boron and iron associated ore beneficiation process adopting a high-pressure roller mill.
Background
The boron ore deposit with the symbiosis of boron and iron comprises magnetite and ludwigite as main ore minerals, and fiber ludwigite, tunneling stone and crystalline uranium ore as secondary ore minerals. Iron, boron and uranium are important raw materials of steel, chemical industry and energy, but primary ores are fine in embedded granularity of useful minerals, complex in intergrowth characteristics, and cause a lot of difficulties in comprehensive utilization of the ores.
The existing ore dressing process mainly adopts a two-section grinding classification-two-section magnetic separation process to recover iron ore concentrate, the two-section magnetic separation comprehensive tailings are screened into two size fractions and then reselected to recover uranium ore concentrate, and the reselected tailings utilize a hydrocyclone to classify boron ore concentrate. The process has the outstanding problems that the power consumption of ore grinding is high, the treatment capacity of the ore dressing process is low, the dissociation of iron and boron monomers is insufficient, particularly, when the treatment capacity of the ore dressing process is improved, the ore grinding granularity is reduced to cause the coarse granularity of magnetic separation tailings, the dissociation condition of uranium cannot be achieved, the quality of uranium concentrate is unstable, and meanwhile, due to the reason of ore dilution, the boron grade of an ore entering grinding raw ore is only 4-5%, the boron grade of a section of weak magnetic tailings is only 5-6%, and the boron concentrate grade is influenced and discarded after being combined with a section of weak magnetic tailings, so that the waste of resources is caused.
Disclosure of Invention
The invention aims to provide a high-pressure roller grinding superfine coarse grain tailing discarding method applied to ludwigite,
(1) feeding the crushed raw ore material with the size of 12-0mm into a high-pressure roller mill for rolling, mixing the discharged material of the high-pressure roller mill with water to form ore pulp, feeding the ore pulp into a wet sieving machine, mixing coarse particles on a sieve with the raw material, conveying the mixture to the high-pressure roller mill again for rolling, and conveying the sieved ore pulp as an ultrafine crushed product to the next process; after the high-pressure roller mill is used for crushing, controlling the granularity of the output material to be 5-0 mm;
(2) carrying out coarse grain tailing discarding magnetic separation on the ore pulp obtained in the step (1), and discarding gangue minerals containing surrounding rocks as tailings I; the rest is the selected magnetic concentrate I and enters the next working procedure;
the ore pulp adopts a wet permanent magnet drum magnetic separator to carry out coarse grain tailing magnetic separation, the wet permanent magnet drum magnetic separator adopts a downstream type machine groove, and the magnetic induction intensity is 0.5T.
The invention has the advantages and positive effects that:
(1) the crushing ratio of the high-pressure roller grinding is advanced sufficiently to realize the mineral separation principle of more crushing and less grinding, and the grindability of the raw materials is improved after the raw materials are rolled by the high pressure roller, so that the passing capacity of a mineral separation system is improved, the energy is saved, and the consumption is reduced;
(2) according to the invention, the characteristic coarse grain tailing discarding of the ore is utilized, so that most of surrounding rocks and gangue in the traditional crushing process are prevented from entering a grinding system, the ore dressing principle of throwing and early discarding is met, the energy consumption is further reduced, and the green development requirement is met.
Drawings
FIG. 1 is a process flow diagram of the invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings.
As shown in fig. 1, the present invention comprises the steps of:
(1) feeding the crushed raw ore material with 12-0mm of iron grade, 25.14% of boron trioxide grade, 4.14% of uranium grade and 0.0052% of uranium grade into a high-pressure roller mill for rolling, mixing the discharged material of the high-pressure roller mill with 2-3 times of water to form ore pulp, feeding the ore pulp into a wet sieving machine, mixing the oversize coarse particles with the raw material, conveying the mixture to the high-pressure roller mill again for rolling, and conveying the sieved ore pulp as a superfine crushed product to the next process;
(2) carrying out coarse-grain tailing discarding magnetic separation on the ore pulp obtained in the step (1), wherein gangue minerals containing 27.85% of surrounding rock are used as tailings I, the rest gangue minerals are selected magnetic concentrates I, the iron grade of the magnetic concentrates I is 5.86%, and the loss rate is 6.49%; the grade of the diboron trioxide is 1.39 percent, and the loss rate is 9.35 percent; the uranium grade is 0.0033 percent, and the loss rate is 17.68 percent; the selected magnetic concentrate I enters the next procedure;
(3) carrying out primary grinding on the magnetic concentrate I selected in the step (2) through a first-stage closed circuit grinding system, and controlling the granularity of an output product to be 74 mu m and the content to be 50-55% (by weight, the same below);
(4) carrying out primary low-intensity magnetic separation on the product obtained in the step (3) to obtain magnetic concentrate II and tailings II, wherein the magnetic concentrate II is subjected to a two-stage closed circuit grinding process, and the tailings II are subjected to fine sand gravity separation process for recovery to obtain uranium concentrate I with the uranium grade of 0.1082% and the recovery rate of 23.92%;
(5) levigating the magnetic concentrate II obtained in the step (4) through a two-stage closed circuit grinding system, and controlling the granularity of an output product to be 74 mu m and the content to be 90 percent;
(6) performing weak magnetic concentration on the product obtained in the step (5) to obtain magnetic concentrate III and tailings III, wherein the magnetic concentrate III is filtered to produce boron-containing iron concentrate powder, the iron grade is 58-60%, and the recovery rate is more than 83%;
(7) the grade of uranium recovered by the tailings III in a fine mud gravity separation process is 0.1109%, the recovery rate is 17.74% of uranium concentrate II, the uranium concentrate I and the uranium concentrate II are combined into uranium concentrate III which is supplied to a hydrometallurgy plant, and the total recovery rate of the uranium grade is 0.1092% and is 38.01%;
(8) and (3) respectively carrying out gravity separation on the tailings II and III in the steps (4) and (6) to recover uranium concentrate, merging gravity-separated tailings, sending the merged tailings into a cyclone in the next procedure for coarse separation, and then removing iron by using a high-gradient vertical ring magnetic separator to obtain boron concentrate, wherein the grade of boron trioxide is 11.47%, and the recovery rate is 47.36%.
In this embodiment:
the model of the high-pressure roller mill used in the step (1) is GM160-140, the crushing granularity is reduced from-10 mm to 0 to-5 mm to 0, the screening machine I is a five-layer high-efficiency screening machine, and the mass concentration of the ore pulp is 40-45%;
performing coarse grain tailing magnetic separation on the ore pulp in the step (2) by adopting a wet permanent magnet drum magnetic separator, wherein the wet permanent magnet drum magnetic separator adopts a downstream type machine groove, and the magnetic induction intensity of the wet permanent magnet drum magnetic separator is 0.5T;
the first-stage closed-circuit ore grinding system in the step (3) comprises a mill I, materials are input into the mill to be ground and then are classified by using a hydrocyclone, the hydraulic classification is a known technology in the field, overflow fine-grained products of the hydrocyclone are fed into a five-layer high-efficiency screening machine II, oversize coarse grains and underflow coarse grains of the hydrocyclone are returned to the mill to be ground, undersize grains meeting the output product requirements directly enter the first-stage weak magnetic separation process in the step (4), and the mill I is an overflow ball mill.
In the step (4), a wet permanent magnet drum magnetic separator is adopted for the first-stage weak magnetic separation, a semi-countercurrent machine groove is adopted for the wet permanent magnet drum magnetic separator, and the magnetic induction intensity is 0.13T;
and (3) the second-stage closed circuit ore grinding system in the step (5) comprises a mill II and a screening machine III, wherein the grains which are screened to meet the output product requirement enter the second-stage weak magnetic separation process in the step (6), the remaining grains which are not screened are sent to the mill II for regrinding, the mill II is an overflow type ball mill, and the screening machine III is a four-layer electromagnetic vibration high-frequency vibrating screen.
In the step (6), a double-roller wet type permanent magnet drum magnetic separator is adopted for the two-stage low-intensity magnetic separation, a semi-countercurrent type machine groove is adopted for the double-roller wet type permanent magnet drum magnetic separator, and the magnetic induction intensities are respectively 0.115T and 0.165T;
the tailings in the steps (4) and (6) adopt a reselection mode, which is a known technology in the field;
in the iron removal process of the boron concentrate in the step (8), a high-gradient vertical ring magnetic separator is adopted to improve the grade of the boron concentrate by 1%, wherein the diameter of the high-gradient vertical ring magnetic separator is 2.5m, and the background field intensity is 0.6T;
the cyclone de-coarsening in step (8) is a technique well known in the art.
In this embodiment, the slurry is delivered by a slurry pump and a pipeline.
In the research and development process, the effects of the steps are verified through a high-pressure roller grinding superfine grinding test, a relative grindability test of a superfine grinding product, a coarse grain tailing discarding magnetic separation test, a magnetic concentrate stage grinding first-stage and second-stage grinding capacity matching test after coarse grain tailing discarding and the like.
The effect of the above steps is verified by experiments below.
1. Analyzing the particle size before and after high-pressure roller grinding:
2. comparative test of relative grindability before and after high-pressure roller grinding:
under the same grinding test conditions, when the new-74 mu m particle size fraction content is 95%, the time of the superfine crushed product is shorter than that of the raw ore before superfine crushing, the product is relatively easy to grind, and the ratio is as follows:
K＝9.7/12.1＝0.802
3. the coarse grain tailing discarding magnetic separation indexes are shown in the following table:
4. and (3) carrying out capability matching test on the first-stage grinding and second-stage closed circuit grinding system.
In the prior art, the raw ore processing capacity of a single-series beneficiation process is 140t/h, the first-stage grinding graded overflow is subjected to magnetic separation, the material with the content of minus 74 mu m of the second-stage closed circuit grinding is fed into the first-stage closed circuit grinding, and the content of the final iron ore concentrate with the content of minus 74 mu m is 81.25 percent. According to the invention, the high-pressure roller grinding superfine material is subjected to coarse grain tailing discarding, ore grinding tests and the like, and finally, the first-stage and second-stage ore grinding loads are re-matched as follows: the processing capacity of the single-series mineral processing technology is improved to 181.51t/h, the content of the first-stage closed circuit grinding ore product is 45.71 percent of minus 74 mu m after magnetic separation, and the content of the final iron ore concentrate is 90.89 percent of minus 74 mu m.
Claims (1)
1. The high-pressure roller milling superfine coarse grain tailing discarding method applied to ludwigite is characterized in that:
(1) feeding the crushed raw ore material with the size of 12-0mm into a high-pressure roller mill for rolling, mixing the discharged material of the high-pressure roller mill with water to form ore pulp, feeding the ore pulp into a wet sieving machine, mixing coarse particles on a sieve with the raw material, conveying the mixture to the high-pressure roller mill again for rolling, and conveying the sieved ore pulp as an ultrafine crushed product to the next process; after the high-pressure roller mill is used for crushing, controlling the granularity of the output material to be 5-0 mm;
(2) carrying out coarse grain tailing discarding magnetic separation on the screened ore pulp obtained in the step (1), and discarding gangue minerals containing surrounding rocks as tailings I; the rest is the selected magnetic concentrate I and enters the next working procedure;
coarse grain tailing magnetic separation is carried out on the screened ore pulp by adopting a wet permanent magnet drum magnetic separator, the wet permanent magnet drum magnetic separator adopts a downstream type machine groove, and the magnetic induction intensity of the downstream type machine groove is 0.5T;
adding 2-3 times of water into the raw ore material in the step (1) and mixing to form ore pulp;
carrying out primary grinding on the magnetic concentrate I selected in the step (2) through a first-stage closed circuit grinding system, and controlling the granularity of an output product to be 74 mu m and the content to be 50-55% by weight;
carrying out primary low-intensity magnetic separation on the obtained product to obtain magnetic concentrate II and tailings II, wherein the magnetic concentrate II enters a two-stage closed circuit grinding process, and the tailings II enter a fine sand gravity separation process to be recycled to obtain uranium concentrate I;
levigating the obtained magnetic concentrate II through a two-stage closed circuit grinding system, and controlling the granularity of an output product to be 74 mu m, wherein the content of the output product is 90% by weight;
carrying out weak magnetic concentration on the product obtained in the step to obtain magnetic concentrate III and tailings III, wherein the magnetic concentrate III is filtered to produce boron-containing iron concentrate, the iron grade is 58-60%, and the recovery rate is more than 83%;
recycling the tailings III in a fine mud gravity separation process to obtain uranium concentrate II, combining the uranium concentrate I and the uranium concentrate II into uranium concentrate III, and feeding the uranium concentrate III to a hydrometallurgy plant;
and after the tailings II and the tailings III are respectively subjected to gravity separation to recover uranium concentrate, the gravity separation tailings are combined together and sent to a swirler in the next procedure for coarse removal, and then a high-gradient vertical ring magnetic separator is used for removing iron to obtain boron concentrate.
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| CN109201286A (en) * | 2018-11-19 | 2019-01-15 | 洛阳栾川钼业集团股份有限公司 | A kind of grind grading method improving molybdenum ore treating capacity |
| CN109876924B (en) * | 2019-03-09 | 2020-08-28 | 大连地拓环境科技有限公司 | Resource utilization method of boric sludge |
| CN113102080A (en) * | 2021-04-20 | 2021-07-13 | 东北大学 | A two-stage series high-pressure roller mill-stirring mill short-flow grinding system and method thereof |
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| DE4132383C1 (en) * | 1991-09-28 | 1993-05-27 | Egon 5650 Solingen De Kluthe | Arrangement for sepg. weakly magnetic impurities from e.g. cooling liquids - includes transport surface with associated magnet device, and nozzle above surface to supply coolant liq. |
| CN101502819B (en) * | 2009-03-25 | 2010-11-24 | 中钢集团马鞍山矿山研究院有限公司 | Pre-selection method of low-ore grade magnetic iron ore |
| CN102101068A (en) * | 2010-12-07 | 2011-06-22 | 东北大学 | Bauxite high-pressure roll-milling ultrafine grinding method |
| CN103447144A (en) * | 2013-08-27 | 2013-12-18 | 安徽大昌矿业集团有限公司 | Method for raising iron content and reducing silicon in concentrate by means of low-intensity magnetic separation process |
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| CN105032610A (en) * | 2015-09-16 | 2015-11-11 | 鞍钢集团矿业公司 | High-pressure roller selective comminuting and magnetic separating method for lean magnetite ore |
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