CN114918036A - Sorting method for directionally enriching mica and efficiently separating lepidolite from muscovite - Google Patents
Sorting method for directionally enriching mica and efficiently separating lepidolite from muscovite Download PDFInfo
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- 239000010445 mica Substances 0.000 title claims abstract description 96
- 229910052618 mica group Inorganic materials 0.000 title claims abstract description 96
- 229910052629 lepidolite Inorganic materials 0.000 title claims abstract description 63
- 238000000034 method Methods 0.000 title claims abstract description 48
- YGANSGVIUGARFR-UHFFFAOYSA-N dipotassium dioxosilane oxo(oxoalumanyloxy)alumane oxygen(2-) Chemical compound [O--].[K+].[K+].O=[Si]=O.O=[Al]O[Al]=O YGANSGVIUGARFR-UHFFFAOYSA-N 0.000 title claims abstract description 25
- 229910052627 muscovite Inorganic materials 0.000 title claims abstract description 25
- 238000005188 flotation Methods 0.000 claims abstract description 55
- 238000007885 magnetic separation Methods 0.000 claims abstract description 31
- 238000000227 grinding Methods 0.000 claims abstract description 22
- 239000010438 granite Substances 0.000 claims abstract description 14
- 239000012141 concentrate Substances 0.000 claims description 100
- 239000003795 chemical substances by application Substances 0.000 claims description 13
- JRBPAEWTRLWTQC-UHFFFAOYSA-N dodecylamine Chemical compound CCCCCCCCCCCCN JRBPAEWTRLWTQC-UHFFFAOYSA-N 0.000 claims description 8
- 230000002000 scavenging effect Effects 0.000 claims description 8
- -1 alkyl propyl ether amine Chemical class 0.000 claims description 6
- 239000011790 ferrous sulphate Substances 0.000 claims description 4
- 235000003891 ferrous sulphate Nutrition 0.000 claims description 4
- BAUYGSIQEAFULO-UHFFFAOYSA-L iron(2+) sulfate (anhydrous) Chemical compound [Fe+2].[O-]S([O-])(=O)=O BAUYGSIQEAFULO-UHFFFAOYSA-L 0.000 claims description 4
- 229910000359 iron(II) sulfate Inorganic materials 0.000 claims description 4
- NWONKYPBYAMBJT-UHFFFAOYSA-L zinc sulfate Chemical compound [Zn+2].[O-]S([O-])(=O)=O NWONKYPBYAMBJT-UHFFFAOYSA-L 0.000 claims description 4
- 229960001763 zinc sulfate Drugs 0.000 claims description 4
- 229910000368 zinc sulfate Inorganic materials 0.000 claims description 4
- 229910000831 Steel Inorganic materials 0.000 claims description 2
- 229910052650 alkali feldspar Inorganic materials 0.000 claims description 2
- 239000003607 modifier Substances 0.000 claims description 2
- 239000002516 radical scavenger Substances 0.000 claims description 2
- 239000010959 steel Substances 0.000 claims description 2
- 229910052500 inorganic mineral Inorganic materials 0.000 abstract description 40
- 239000011707 mineral Substances 0.000 abstract description 40
- 239000010433 feldspar Substances 0.000 abstract description 15
- 238000000926 separation method Methods 0.000 abstract description 10
- 235000010755 mineral Nutrition 0.000 description 38
- 238000011084 recovery Methods 0.000 description 10
- 229910001760 lithium mineral Inorganic materials 0.000 description 9
- 229910018068 Li 2 O Inorganic materials 0.000 description 7
- 238000004458 analytical method Methods 0.000 description 7
- 239000004576 sand Substances 0.000 description 7
- 229910052744 lithium Inorganic materials 0.000 description 5
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 4
- KWYUFKZDYYNOTN-UHFFFAOYSA-M Potassium hydroxide Chemical compound [OH-].[K+] KWYUFKZDYYNOTN-UHFFFAOYSA-M 0.000 description 3
- 238000002441 X-ray diffraction Methods 0.000 description 3
- 238000010494 dissociation reaction Methods 0.000 description 3
- 230000005593 dissociations Effects 0.000 description 3
- 229940072033 potash Drugs 0.000 description 3
- BWHMMNNQKKPAPP-UHFFFAOYSA-L potassium carbonate Substances [K+].[K+].[O-]C([O-])=O BWHMMNNQKKPAPP-UHFFFAOYSA-L 0.000 description 3
- 235000015320 potassium carbonate Nutrition 0.000 description 3
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 2
- 150000001412 amines Chemical class 0.000 description 2
- 150000001768 cations Chemical class 0.000 description 2
- 239000012535 impurity Substances 0.000 description 2
- 229910052742 iron Inorganic materials 0.000 description 2
- 239000002994 raw material Substances 0.000 description 2
- 238000010187 selection method Methods 0.000 description 2
- FUJCRWPEOMXPAD-UHFFFAOYSA-N Li2O Inorganic materials [Li+].[Li+].[O-2] FUJCRWPEOMXPAD-UHFFFAOYSA-N 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 230000006978 adaptation Effects 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 238000000498 ball milling Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000000919 ceramic Substances 0.000 description 1
- 239000003153 chemical reaction reagent Substances 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- XUCJHNOBJLKZNU-UHFFFAOYSA-M dilithium;hydroxide Chemical compound [Li+].[Li+].[OH-] XUCJHNOBJLKZNU-UHFFFAOYSA-M 0.000 description 1
- 239000003814 drug Substances 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 239000010419 fine particle Substances 0.000 description 1
- 150000002500 ions Chemical class 0.000 description 1
- GELKBWJHTRAYNV-UHFFFAOYSA-K lithium iron phosphate Chemical compound [Li+].[Fe+2].[O-]P([O-])([O-])=O GELKBWJHTRAYNV-UHFFFAOYSA-K 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 239000006148 magnetic separator Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000007935 neutral effect Effects 0.000 description 1
- 229940051841 polyoxyethylene ether Drugs 0.000 description 1
- 229920000056 polyoxyethylene ether Polymers 0.000 description 1
- 238000000746 purification Methods 0.000 description 1
- 238000007670 refining Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
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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
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/52—Mechanical processing of waste for the recovery of materials, e.g. crushing, shredding, separation or disassembly
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- Manufacture And Refinement Of Metals (AREA)
Abstract
The invention relates to a sorting method for directionally enriching mica and efficiently separating lepidolite from muscovite. The sorting method comprises the steps of raw ore grinding, mica flotation, regrinding, high-gradient magnetic separation and the like. The mineral separation method provided by the invention has the advantages of simple process flow, high technical index and easiness in industrialization, and can realize the purpose of separating mica single mineral Li 2 And effectively recovering lepidolite from the alkaline feldspar granite type ore deposit with the O grade of less than 2 percent.
Description
Technical Field
The invention relates to the technical field of mineral separation, in particular to a sorting method for directionally enriching mica and efficiently separating lepidolite from muscovite.
Technical Field
The lithium mineral associated with the alkaline feldspar granite type deposit is typically lepidolite, muscovite, etc., wherein the muscovite Li 2 O theoretical grade of 0-0.2%, and lepidolite Li 2 The theoretical grade of O is 5.9 percent, and the lithium iron phosphate is an important raw material for refining the lithium metal. The existing lepidolite beneficiation method mainly comprises a hand selection method, a flotation method and a wind selection method, wherein the flotation method is mainly adopted for lepidolite ores with low grade, fine particle embedding and granularity smaller than 1.17mm, the positive ion collecting agent is the best collecting agent, alkylamine hydrochloride is used, lepidolite can be well floated in acid and neutral media, but the flotation performance of mica minerals such as muscovite, lepidolite and the like is very similar to that of lepidolite, and the mica minerals are jointly enriched into concentrate during flotation to form mica concentrate. For the monomineral Li of mica (including lepidolite and muscovite) in alkaline feldspar granite type deposit 2 Ore with O grade lower than 2%, finally obtaining flotation concentrate Li 2 The O grade is less than 2% inevitably, the product can not become qualified concentrate, and the product can not meet the sales requirement, so that the resources can not be developed and utilized. So far, how to realize the directional enrichment of mica minerals in alkaline feldspar granite type ore deposits associated with lithium minerals and the efficient separation of lepidolite and muscovite is a main problem faced by the ores at present.
The prior patent discloses a lepidolite concentrate impurity removal and purification method based on superconducting magnetic separation, which comprises the following specific processes: firstly, carrying out superconducting magnetic roughing on lepidolite concentrate by using a superconducting magnetic separator to obtain roughed magnetic minerals and roughed non-magnetic minerals; then carrying out superconducting magnetic concentration on the roughly selected magnetic minerals to obtain concentrated magnetic mineral tailings and concentrated non-magnetic minerals; then, carrying out superconducting magnetic scavenging on the roughly-selected nonmagnetic mineral to obtain a scavenged magnetic mineral and a scavenged nonmagnetic mineral; and finally, carrying out superconducting magnetic scavenging on the scavenged first non-magnetic mineral to obtain scavenged second magnetic mineral and purified lepidolite concentrate. The method mainly removes the magnetic minerals in the lepidolite concentrate, simply reduces the iron content in the concentrate, and does not definitely explain the improved concentrate grade after impurity removal and the separation problem of lepidolite and muscovite.
The patent discloses a lepidolite flotation method, which comprises the steps of crushing raw ores, and carrying out wet ball milling to obtain ore pulp; and (3) carrying out flotation separation on the ore pulp by using a laurylamine polyoxyethylene ether solution as a collecting agent and sulfuric acid as a regulator to obtain the high-quality lepidolite concentrate. The method has the characteristics of simple process, low medicament consumption, low production cost and good adaptability to slime, and realizes the recovery rate of lepidolite concentrate relative to Li in raw ore 2 O reaches 66.38 percent, and the lepidolite concentrate grade is Li 2 The O content reaches 3.17%, the enrichment ratio reaches 4.80, the comprehensive utilization value of the lepidolite resource is obviously improved, and the method is environment-friendly and has long-term and practical significance in sustainable development. The process adopts the modified dodecylamine collecting agent, improves the selectivity, but desliming is needed after ore grinding, so that the final recovery rate of mica minerals is too low, and the process structure is complex.
Accordingly, the mica single mineral Li 2 Alkaline feldspar granite type deposit with O grade lower than 2 percent, a set of directionally enriched mica minerals and efficiently separated lepidolite and muscovite is developed, and Li can be finally obtained 2 The sorting process of the lepidolite concentrate with the O grade larger than 2% has important economic and social benefits for developing the alkaline feldspar granite type deposit associated with the lithium mineral and improving the utilization rate of the lithium mineral resource.
Disclosure of Invention
The invention aims to solve the problems that the mica mineral is difficult to directionally enrich and the lepidolite and the muscovite are difficult to efficiently separate in the alkaline feldspar granite type deposit associated with the lithium mineral, and provides a method for directionally enriching the mica and efficiently separating the lepidolite and the muscovite. The beneficiation method has the advantages of simple process flow, high technical index and easy industrialization, and can realize the mica single mineral Li 2 Effectively recovering lepidolite from the alkaline feldspar granite type ore deposit with the O grade lower than 2 percent.
In order to achieve the purpose of the invention, the invention adopts the following technical scheme:
a sorting method for directionally enriching mica and efficiently separating lepidolite from muscovite comprises the following steps:
s1, grinding raw ores: after the regulator is added into the raw ore, the ore pulp concentration is adjusted to be 60-65%, and the ore is ground until the-0.074 mm size fraction of the ground ore product accounts for 50-55%;
s2, mica flotation: mixing the ground ore products until the concentration of ore pulp is 30-35%, adding 150-200 g/t of collecting agent, and performing flotation to obtain mica rough concentrate and rough tailings; carrying out concentration on the mica rough concentrate to obtain mica concentrate and concentrated tailings; adding 30-40 g/t of collecting agent to the roughed tailings, and performing flotation to obtain scavenged concentrate and tailings;
s3, regrinding: adjusting the concentration of ore pulp of mica flotation concentrate to 50-55%, and then grinding until the-0.043 mm size fraction of the ground ore product accounts for 90-95%;
s4, high gradient magnetic separation: performing high-gradient magnetic separation on the ground ore product obtained in the step S3 to obtain magnetic concentrate, namely lepidolite concentrate, and magnetic tailings are mica concentrate; the background magnetic field intensity of the high-gradient magnetic separation is 0.5-0.7T.
Mica concentrate obtained by the existing beneficiation method contains lepidolite and muscovite which are close in properties and generally considered to be nonmagnetic substances, and cannot be separated efficiently at present. The inventor of the invention finds that the lepidolite and the muscovite have obvious magnetic difference under the condition that the background magnetic field intensity is 0.5-0.7T, and can be separated efficiently.
The method realizes the directional enrichment of mica minerals by flotation of mica concentrate; then regrinding is carried out to realize deep dissociation of the lepidolite minerals and create conditions for subsequent magnetic separation; and then high-gradient magnetic separation with specific background magnetic field intensity is utilized to obtain lepidolite concentrate and mica concentrate, so that high-efficiency separation of lepidolite and muscovite is realized, and qualified lepidolite concentrate with the grade of Li2O being more than 2% and the recovery rate being more than 45% is obtained.
The mineral separation method has simple process flow, high technical index and easy industrialization, and realizes the aim of separating the mica monomineral Li 2 And effectively recovering lepidolite from the alkaline feldspar granite type ore deposit with the O grade of less than 2 percent. Of course, the method of the invention is also applicable to the sorting of high-grade lithium minerals, except for the sorting of alkaline feldspar granite type ores.
Preferably, the modifier in S1 is one or two of zinc sulfate or ferrous sulfate; the collector in S2 is one or more of laurylamine or alkyl propyl ether amine.
Because amine collecting agents are sensitive to slime, generally, raw ores are sorted after being deslimed, so that the mica ore quantity is lost, the subsequent separation of mica ore concentrate is influenced, and the desliming operation makes the process more complicated. According to the invention, one of the two inorganic regulators is added, so that the selectivity of the amine collecting agent can be effectively improved, and the main reason is that the two inorganic regulators can release cations in the flotation process and adsorb on the surface of mica; meanwhile, the cation and subsequent specific dodecylamine or alkyl propyl ether amine form a complex compound to be attached to the mica surface, so that the hydrophobicity of the mica is increased, the floatability of the mica is further improved, mica concentrate with higher purity is finally obtained by flotation, and the effective directional enrichment of the non-deslimed mica mineral is realized.
Preferably, flotation is carried out for 3-5 min in S2, and mica rough concentrate and rough tailings are obtained.
Preferably, flotation is carried out for 2-3 min in S2, and scavenging concentrate and tailings are obtained.
Preferably, the selection process in S2 is: carrying out primary concentration on the mica rough concentrate, and carrying out flotation for 3-5 min to obtain primary concentrated concentrate and primary concentrated tailings; and (3) carrying out second-stage concentration on the mica first-stage concentrated concentrate, and carrying out flotation for 3-5 min to obtain the mica concentrate and second-stage concentrated tailings.
More preferably, S2 further includes the step of combining the first stage of concentration tailings and scavenger concentrate back to the mica flotation rougher operation.
More preferably, S2 further includes the step of returning the second stage concentration tailings to the first stage concentration operation.
Preferably, the regrinding in S3 is regrinding using moxa sanding. The unique selective ore grinding and ceramic ore grinding medium of the moxa sand grinding can better realize the deep dissociation of lepidolite minerals on the basis of reducing the excessive crushing of lepidolite and preventing the surface from being polluted by iron and other metals.
Preferably, the medium selected for high-gradient magnetic separation in S4 is a steel bar with the diameter of 1.5-2.5 mm.
Preferably, the pulse frequency of the high-gradient magnetic separation in S4 is 40-60 Hz.
Preferably, the raw ore in S1 is an alkali feldspar granite type ore.
Compared with the prior art, the invention has the following beneficial effects:
(1) the invention realizes the directional enrichment of mica minerals by flotation of mica concentrate; then regrinding is carried out to realize deep dissociation of the lepidolite minerals and create conditions for subsequent magnetic separation; then obtaining lepidolite concentrate and mica concentrate by high gradient magnetic separation of specific background magnetic field intensity, realizing high-efficiency separation of lepidolite and muscovite, and obtaining Li 2 Qualified lepidolite concentrate with O grade more than 2 percent and recovery rate more than 45 percent.
(2) The mineral separation method has simple process flow, high technical index and easy industrialization, and realizes the aim of separating the mica monomineral Li 2 Effectively recovering lepidolite from the alkaline feldspar granite type ore deposit with the O grade lower than 2 percent.
Drawings
FIG. 1 is a process flow diagram of example 1.
Detailed Description
The invention is further illustrated by the following examples. These examples are intended to illustrate the invention and are not intended to limit the scope of the invention. Experimental procedures without specific conditions noted in the examples below, generally according to conditions conventional in the art or as suggested by the manufacturer; the raw materials, reagents and the like used are, unless otherwise specified, those commercially available from the conventional markets and the like. Any insubstantial changes from the invention, including those variations and alterations made by those skilled in the art, are intended to be covered by the claims.
Example 1
The raw ore is low-grade lepidolite ore from Yichun in Jiangxi, and the raw ore is Li 2 The O grade was 0.25%. The lithium mineral is mainly muscovite and secondly lepidolite. The lepidolite and muscovite mineral contents were 1.83% and 13.27%, respectively, in a ratio of about 1: 7.25. Mica monomineral analysis: average Li content 2 O 1.66％。
As shown in fig. 1, the sorting method of this embodiment is as follows:
(1) grinding raw ore: grinding ore at 65% concentration, adding 2000g/t zinc sulfate into the grinding machine, and controlling the fineness of the ground ore product to be-0.074 mm, wherein the fraction accounts for 60%.
(2) Mica flotation: the ground ore product is slurried to 32% concentration, 200g/t of dodecylamine is added, flotation is carried out for 4min, and mica rough concentrate and rough tailings are obtained; carrying out primary concentration on the mica rough concentrate, and carrying out flotation for 4min to obtain primary concentrated concentrate and primary concentrated tailings; performing second-stage concentration on the mica first-stage concentrated concentrate, and performing flotation for 4min to obtain mica concentrate and second-stage concentrated tailings; adding 40g/t of dodecylamine into the roughed tailings, and performing flotation for 2.5min to obtain scavenged concentrate and tailings; and combining the first-stage concentration tailings and the scavenging concentrates and returning to the mica flotation roughing operation, and returning the second-stage concentration tailings to the first-stage concentration operation. The yield of mica concentrate obtained was 13.73%, Li 2 O grade 1.56%, Li 2 The O recovery was 85.70%. XRD analysis showed that: the amount of mica minerals was 98.6% and the amount of potash feldspar minerals was 1.4%.
(3) Grinding and regrinding the moxa: and (3) regrinding the mica flotation concentrate by using a moxa sand mill, wherein the concentration of the ground ore is controlled to be 53%, and the fineness of the ground ore product is controlled to be-0.043 mm, and the fraction accounts for 92%.
(4) And (4) performing magnetic analysis on the flotation mica concentrate by using a magnetic analyzer to determine the optimal magnetic field intensity of 0.5T.
TABLE 1 mica flotation concentrate magnetic analysis results
| Field strength/T | Yield/%) | Li 2 O grade/% |
| 0.5 | 24.95 | 2.48 |
| 0.88 | 56.07 | 1.52 |
| 1.06 | 5.1 | 1.18 |
| Non-magnetic | 13.88 | 0.21 |
| Total up to | 100 | 1.56 |
(5) High gradient magnetic separation: and carrying out high-gradient magnetic separation on the moxa sand products, wherein the size of a medium for magnetic separation is 2.0mm, the background magnetic field intensity is controlled at 0.5T, and the pulse frequency is controlled at 50 Hz. The obtained magnetic separation concentrate is lepidolite concentrate, and the magnetic separation tailings are mica concentrate.
The yield of the obtained lepidolite concentrate was 5.00%, Li 2 The O grade is 2.22 percent, and the recovery rate is 45.55 percent.
Example 2
The raw ore is low-grade lepidolite ore from Shanxi Shannan, and the raw ore is Li 2 The O grade was 0.33%. The lithium mineral is mainly muscovite and then is lepidolite. The lepidolite and muscovite mineral contents were 2.77% and 15.09%, respectively, in a ratio of about 1: 5.5. Mica single mineral analysis: average Li content 2 O 1.87％。
The sorting method of the embodiment is as follows:
(1) grinding raw ore: grinding ore at 60% concentration, adding 1500g/t ferrous sulfate into the grinding machine, and controlling the fineness of the ground ore product to be-0.074 mm, wherein the fraction accounts for 55%.
(2) Mica flotation: the ground ore product is mixed to the concentration of 35 percent, and then 150g/t of alkyl propyl ether amine is added for flotation for 3min to obtain mica rough concentrate and rough tailings; carrying out first-stage concentration on the mica rough concentrate, and carrying out flotation for 3min to obtain first-stage concentration concentrate and first-stage concentration tailings; performing second-stage concentration on the mica first-stage concentrated concentrate, and performing flotation for 3min to obtain mica concentrate and second-stage concentrated tailings; adding 30g/t of alkyl propyl ether amine into the roughed tailings, and performing flotation for 2min to obtain scavenging concentrate; and merging the first-stage concentration tailing and scavenging concentrate, returning to the mica flotation roughing operation, and returning the second-stage concentration tailing to the first-stage concentration operation. The yield of mica concentrate obtained was 17.55%, Li 2 O grade 1.62%, Li 2 The O recovery was 86.13%. XRD analysis showed that the amount of mica minerals was 98.3% and the amount of potash feldspar minerals was 1.7%.
(3) Grinding and regrinding the moxa: and (3) regrinding the mica flotation concentrate by using a moxa sand mill, wherein the concentration of ground ore is controlled to be 55%, and the fineness of ground ore products is controlled to be-0.043 mm, and the fraction accounts for 90%.
(4) And (4) performing magnetic analysis on the flotation mica concentrate by adopting a magnetic analyzer to determine the optimal magnetic field intensity of 0.6T.
(5) High gradient magnetic separation: and carrying out high-gradient magnetic separation on the moxa sand products, wherein the size of a medium for magnetic separation is 1.5mm, the background magnetic field intensity is controlled at 0.6T, and the pulse frequency is controlled at 40 Hz. The obtained magnetic separation concentrate is lepidolite concentrate, and the magnetic separation tailings are mica concentrate.
The yield of the obtained lepidolite concentrate was 6.95%, Li 2 O grade of 2.27%, concentrate Li 2 The O recovery was 47.80%.
Example 3
The raw ore is low-grade lepidolite ore from inner Mongolia red peak, and the raw ore is Li 2 The O grade is 0.40%. The lithium mineral is mainly muscovite and secondly lepidolite. The lepidolite and muscovite mineral contents were 3.62% and 17.24%, respectively, in a ratio of about 1: 4.76. Mica monomineral analysis: average Li content 2 O 1.95％。
The sorting method of the embodiment is as follows:
(1) grinding raw ore: grinding ore at 62% concentration, adding 1800g/t mixed regulator into the grinding machine, wherein the mixed regulator is prepared by mixing zinc sulfate and ferrous sulfate in a mass ratio of 1:2, and the fineness of the ground ore product is controlled to be 55% in a-0.074 mm size fraction.
(2) Mica flotation: mixing the ground ore product to a concentration of 30%, adding 160g/t of mixed collecting agent, mixing the mixed collecting agent with dodecylamine and alkyl propyl ether amine in a mass ratio of 1:3, and performing flotation for 4.5min to obtain mica rough concentrate and rough tailings; carrying out first-stage concentration on the mica rough concentrate, and carrying out flotation for 4.5min to obtain first-stage concentration concentrate and first-stage concentration tailings; performing second-stage concentration on the mica first-stage concentrated concentrate, and performing flotation for 4.5min to obtain mica concentrate and second-stage concentrated tailings; adding 32g/t of collecting agent into the roughed tailings, and performing flotation for 3min to obtain scavenged concentrate and tailings; and combining the first-stage concentration tailings and the scavenging concentrates and returning to the mica flotation roughing operation, and returning the second-stage concentration tailings to the first-stage concentration operation. The yield of mica concentrate obtained was 20.04%, Li 2 O grade 1.73%, Li 2 The O recovery was 86.68%. XRD analysis showed that the amount of mica minerals was 98.9% and the amount of potash feldspar minerals was 1.1%.
(3) Grinding and regrinding the moxa: and (3) regrinding the mica flotation concentrate by using a moxa sand mill, wherein the concentration of ground ore is controlled at 50%, and the fineness of ground ore products is controlled to be-0.043 mm, and the fraction accounts for 95%.
(4) And (4) performing magnetic analysis on the flotation mica concentrate by using a magnetic analyzer to determine the optimal magnetic field intensity of 0.7T.
(5) High gradient magnetic separation: and carrying out high-gradient magnetic separation on the moxa sand product, wherein the size of a medium for magnetic separation is 3mm, the intensity of a background magnetic field is controlled at 0.7T, and the pulse frequency is controlled at 60 Hz. The obtained magnetic separation concentrate is lepidolite concentrate, and the magnetic separation tailings are mica concentrate.
The yield of the obtained lepidolite concentrate was 8.73%, Li 2 O grade of 2.34%, concentrate Li 2 The O recovery was 51.10%.
From the above, the beneficiation method has the advantages of simple process flow, high technical index and easy industrialization, and can realize the Li mica monomineral 2 Effectively recovering lepidolite from the alkaline feldspar granite type ore deposit with the O grade lower than 2 percent.
While the foregoing is directed to particular example embodiments of the present invention, numerous modifications and adaptations may be made by those skilled in the art without departing from the principles of the present invention. Rather, the scope of the invention is defined by the appended claims and equivalents thereof.
Claims (10)
1. A sorting method for directionally enriching mica and efficiently separating lepidolite from muscovite is characterized by comprising the following steps:
s1, grinding raw ores: after adding a regulator into raw ore, grinding ore until the ore pulp concentration is adjusted to be 60-65% and the-0.074 mm size fraction of the ground ore product accounts for 50-55%;
s2, mica flotation: mixing the ground ore product until the concentration of the ore pulp is 30-35%, adding 150-200 g/t of collecting agent, and performing flotation to obtain mica rough concentrate and rough tailings; carrying out concentration on the mica rough concentrate to obtain mica concentrate and concentrated tailings; adding 30-40 g/t of collecting agent to the roughed tailings, and performing flotation to obtain scavenged concentrate and tailings;
s3, regrinding: adjusting the concentration of ore pulp of mica flotation concentrate to 50-55%, and then grinding until the-0.043 mm size fraction of the ground ore product accounts for 90-95%;
s4, high gradient magnetic separation: performing high-gradient magnetic separation on the ground ore product obtained in the step S3 to obtain magnetic concentrate, namely lepidolite concentrate, and magnetic tailings are mica concentrate; the background magnetic field intensity of the high-gradient magnetic separation is 0.5-0.7T.
2. The grading method according to claim 1, wherein the modifier in S1 is one or both of zinc sulfate and ferrous sulfate; the collector in S2 is one or more of laurylamine or alkyl propyl ether amine.
3. The grading method according to claim 1, wherein flotation is performed for 3-5 min in S2 to obtain mica rough concentrate and rough tailings; and (8) performing flotation for 2-3 min in S2 to obtain scavenging concentrate and tailings.
4. A sorting method according to claim 1, wherein the selecting process in S2 is: carrying out primary concentration on the mica rough concentrate, and carrying out flotation for 3-5 min to obtain primary concentrated concentrate and primary concentrated tailings; and (3) carrying out second-stage concentration on the mica first-stage concentration concentrate, and carrying out flotation for 3-5 min to obtain the mica concentrate and second-stage concentration tailings.
5. The beneficiation process of claim 4, wherein S2 further comprises the step of combining the first stage concentration tailings and the scavenger concentrate back to the mica flotation rougher operation;
6. a beneficiation method according to claim 4, wherein S2 further comprises the step of returning the second stage of the concentration tailings to the first stage of the concentration operation.
7. The grading method according to claim 1, wherein the regrinding in S3 is regrinding by using a moxa mill.
8. The sorting method according to claim 1, wherein the medium for high gradient magnetic separation in S4 is a steel bar with a diameter of 1.5-2.5 mm.
9. The sorting method according to claim 1, wherein the pulsating frequency of the high gradient magnetic separation in S4 is 40-60 Hz.
10. The beneficiation method according to claim 1, wherein the raw ore in S1 is an alkali feldspar granite type ore.
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