Equal floatable separation process for lepidolite containing mud

Abstract

The invention discloses an isofloatable separation process for lepidolite containing mud. The isofloatable separation process comprises the following steps: mixing raw ore with sodium hexametaphosphate, and performing fine grinding; a collecting agent JL-1 is added into the ore grinding product for flotation, and a foam product and an ore pulp product are obtained; the foam product is subjected to two-stage concentration with sodium hexametaphosphate as an inhibitor to obtain first lithium concentrate, concentration tailings are subjected to scavenging with JL-1 as a collecting agent and sodium hexametaphosphate as the inhibitor, and the scavenged foam product is returned to the first-stage concentration; and the ore pulp product is subjected to a one-roughing, two-refining and two-scavenging flotation process with JL-2 as a collecting agent and sodium hexametaphosphate as an inhibitor, and second lithium concentrate is obtained. According to the method, the difference of natural floatability of the minerals is fully utilized, the lepidolite collecting agent JL-1 with high selectivity is selected to carry out equal floatability separation on the raw ores, the easily-floating minerals and the difficultly-floating minerals are obtained, then targeted recovery is carried out through the lepidolite collecting agent JL-1 and the lepidolite collecting agent JL-2 with high collecting property, and the recovery rate of the minerals is improved. Therefore, the grade of lepidolite in each section is improved.

Description

Technical Field

[0001] The invention relates to the field of lepidolite beneficiation, and in particular to an isoflurane separation process for mud-containing lepidolite. Background Art

[0003] Lepidolite is one of the important minerals for lithium extraction. It belongs to the silicate mineral of the mica family. Its color is generally pink or purple, sometimes light to colorless. It usually exists in the form of fine scales or small flakes. It has a significant pearl luster and is also called "lepidolite". Its chemical composition is K{Li 2-x Al 1+x [Al 2x Si 4-2x O 10 ](F,OH)2}(x=0~0.5), and is often associated with a variety of siliceous minerals such as quartz, feldspar, kaolin, montmorillonite and serpentine. At present, the main recovery process of lithium mica is flotation. However, due to the unique flaky structure of lithium mica, it is difficult to grind it. Prolonging the grinding time will lead to an increase in secondary ore slimes, which often cover the lithium mica particles, thereby reducing the yield and recovery rate of lithium mica concentrate.

[0004] Since lithium mica deposits usually undergo severe weathering, the raw ore often contains a large amount of primary ore slime. The circulation of intermediate ore in actual production further leads to the continuous accumulation of ore slime during the concentration process, thereby deteriorating the flotation conditions. The current lithium mica beneficiation process generally adopts the method of desliming before flotation to reduce the impact of ore slime on flotation, which in turn leads to the loss of lithium mica. In order to achieve higher efficient recovery of lithium mica, the development of flotation processes and reagents suitable for high-mud lithium mica is an important issue that needs to be solved urgently. Summary of the invention

[0005] The main purpose of the present invention is to provide a floatable separation process for mud-containing lithium mica, aiming to solve the above problems.

[0006] To achieve the above object, the present invention proposes a floatable separation process for mud-containing lithium mica, comprising:

[0007] S1, mixing the raw ore with sodium hexametaphosphate and then finely grinding it through a mill;

[0008] S2, adding collector JL-1 to the grinding product for flotation to obtain foam product and pulp product;

[0009] S3, the foam product in step S2 is subjected to two-stage selection with sodium hexametaphosphate as an inhibitor to obtain lithium concentrate 1, the selected tailings are scavenged with JL-1 as a collector and sodium hexametaphosphate as an inhibitor, the scavenged foam product is returned to the first stage of selection, and the remaining product forms tailings;

[0010] S4. The pulp product in step S2 is subjected to a one-rough, two-fine, two-sweep flotation process using JL-2 as a collector and sodium hexametaphosphate as a depressant to obtain lithium concentrate and tailings. The tailings and the tailings in step S3 together form the final tailings, and the intermediate ores at each level are returned to the previous flotation process.

[0011] In one embodiment, the raw ore is lepidolite, the grade of Li2O in the raw ore is between 0.2% and 1.2%, and the mass proportion of -325 mesh minerals in the raw ore is between 5% and 35%.

[0012] In one embodiment, the flotation collector JL-1 includes at least one of dodecylamine, sodium oleate, sodium dodecylsulfonate, dodecylamine polyoxyethylene ether and tributyl phosphate.

[0013] In one embodiment, the JL-2 includes at least one of dodecylamine, sodium linoleate, sodium dodecyl sulfate, octadecylamine polyoxyethylene ether and polyethylene glycol.

[0014] In one embodiment, in steps S2, S3 and S4, the pH range of the slurry is controlled to be 6-8.

[0015] In one embodiment, in step S1, the amount of sodium hexametaphosphate used is 200 g / t-1000 g / t.

[0016] In one embodiment, in step S2, the amount of JL-1 used is 300 g / t-800 g / t.

[0017] In one embodiment, in step S3, the amount of sodium hexametaphosphate is 200 g / t-500 g / t, and the amount of collector JL-1 is 100 g / t-300 g / t.

[0018] In one embodiment, in step S4, the amount of sodium hexametaphosphate used in the roughing process is 100g / t-500g / t, and the amount of collector JL-2 used is 200g / t-600g / t; the amount of sodium hexametaphosphate used in the cleaning process is 200g / t-500g / t; the amount of sodium hexametaphosphate used in the scavenging process is 100g / t-300g / t, and the amount of collector JL-2 used is 100g / t-300g / t.

[0019] The beneficial effects of the present invention are as follows:

[0020] (1) Taking full advantage of the differences in the natural floatability of minerals, the highly selective lepidolite collector JL-1 was selected to perform equal floatation separation on the raw ore to obtain easy-floating minerals and difficult-floating minerals, which were then recovered separately through the lepidolite collector JL-1 and the highly selective lepidolite collector JL-2 to improve the grade of each section of lepidolite.

[0021] (2) Adopting equal floatability separation technology, adopting segmented flotation strategy according to the natural flotation of minerals, avoiding forced suppression of easily floatable minerals, and adapting to the complex composition of the original ore. This method can effectively reduce the interference of fine mud on the flotation process, while reducing the amount of flotation reagents and the amount of foam generated. It can not only ensure the high selectivity of the flotation process, but also facilitate control and stable operation, reducing the entrainment phenomenon caused by flotation foam and the difficulties in subsequent pipeline transportation.

[0022] (3) Lepidolite collectors JL-1 and JL-2 have a certain synergistic effect, which can further improve the collection effect of difficult-to-float minerals. At the same time, the mineral processing wastewater generated during the flotation of easy-to-float minerals and difficult-to-float minerals can be recycled in the corresponding process to reduce the treatment cost.

[0023] (4) The present invention creatively separates lithium mica according to its floatability and recovers the two parts of minerals in a targeted manner, thereby achieving full recovery of lithium mica of various particle sizes. It also has many advantages such as high concentrate quality, high sorting efficiency, low reagent dosage and wide applicability. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.

[0025] Figure 1 The present invention is a schematic diagram of the process of iso-floatable separation of mud-containing lithium mica according to an embodiment of the present invention.

[0026] The realization of the purpose, functional features and advantages of the present invention will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0027] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0028] Furthermore, the technical solutions between the various embodiments of the present invention may be combined with each other, but this must be based on the fact that they can be implemented by ordinary technicians in the field. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0029] The invention provides an iso-floatable separation process for mud-containing lepidolite.

[0030] like Figure 1 As shown, the iso-floatable separation process of mud-containing lithium mica provided by the embodiment of the present invention includes:

[0031] S1, mixing the raw ore with sodium hexametaphosphate and then finely grinding it through a mill;

[0032] S2, adding collector JL-1 to the grinding product for flotation to obtain foam product and pulp product;

[0033] S3, the foam product in step S2 is subjected to two-stage selection with sodium hexametaphosphate as an inhibitor to obtain lithium concentrate 1, the selected tailings are scavenged with JL-1 as a collector and sodium hexametaphosphate as an inhibitor, the scavenged foam product is returned to the first stage of selection, and the remaining product forms tailings;

[0034] S4. The pulp product in step S2 is subjected to a one-rough, two-fine, two-sweep flotation process using JL-2 as a collector and sodium hexametaphosphate as a depressant to obtain lithium concentrate and tailings. The tailings and the tailings in step S3 together form the final tailings, and the intermediate ores at each level are returned to the previous flotation process.

[0035] Furthermore, the raw ore is lepidolite, the grade of Li2O in the raw ore is between 0.2% and 1.2%, and the mass proportion of -325 mesh minerals in the raw ore is between 5% and 35%.

[0036] Furthermore, the flotation collector JL-1 includes at least one of dodecylamine, sodium oleate, sodium dodecylsulfonate, dodecylamine polyoxyethylene ether and tributyl phosphate.

[0037] Furthermore, the JL-2 includes at least one of dodecylamine, sodium linoleate, sodium dodecylsulfonate, octadecylamine polyoxyethylene ether and polyethylene glycol.

[0038] Furthermore, in steps S2, S3 and S4, the pH range of the slurry is controlled to be 6-8.

[0039] Furthermore, in step S1, the amount of sodium hexametaphosphate used is 200 g / t-1000 g / t.

[0040] Furthermore, in step S2, the amount of JL-1 used is 300 g / t-800 g / t.

[0041] Furthermore, in step S3, the amount of sodium hexametaphosphate is 200 g / t-500 g / t, and the amount of collector JL-1 is 100 g / t-300 g / t.

[0042] Furthermore, in step S4, the amount of sodium hexametaphosphate used in the roughing process is 100g / t-500g / t, and the amount of collector JL-2 used is 200g / t-600g / t; the amount of sodium hexametaphosphate used in the cleaning process is 200g / t-500g / t; the amount of sodium hexametaphosphate used in the scavenging process is 100g / t-300g / t, and the amount of collector JL-2 used is 100g / t-300g / t.

[0043] Furthermore, the mill in step S1 should be one of a ball mill, a rod mill, an autogenous mill or a semi-autogenous mill.

[0044] Furthermore, in the steps S2, S3 and S4, after adding the reagent, stirring must be performed for 3 minutes to 10 minutes before proceeding to the next step.

[0045] Among them, g / t represents the ratio of the mass of collector to the mass of original ore in the flotation process.

[0046] Compared with the prior art, the present invention has the following beneficial effects:

[0047] (1) Taking full advantage of the differences in the natural floatability of minerals, the highly selective lepidolite collector JL-1 was selected to perform equal floatation separation on the raw ore to obtain easy-floating minerals and difficult-floating minerals, which were then recovered separately through the lepidolite collector JL-1 and the highly selective lepidolite collector JL-2 to improve the grade of each section of lepidolite.

[0048] (2) Adopting equal floatability separation technology, adopting segmented flotation strategy according to the natural flotation of minerals, avoiding forced suppression of easily floatable minerals, and adapting to the complex composition of the original ore. This method can effectively reduce the interference of fine mud on the flotation process, while reducing the amount of flotation reagents and the amount of foam generated. It can not only ensure the high selectivity of the flotation process, but also facilitate control and stable operation, reducing the entrainment phenomenon caused by flotation foam and the difficulties in subsequent pipeline transportation.

[0049] (3) Lepidolite collectors JL-1 and JL-2 have a certain synergistic effect, which can further improve the collection effect of difficult-to-float minerals. At the same time, the mineral processing wastewater generated during the flotation of easy-to-float minerals and difficult-to-float minerals can be recycled in the corresponding process to reduce the treatment cost.

[0050] (4) The present invention creatively separates lithium mica according to its floatability and recovers the two parts of minerals in a targeted manner, thereby achieving full recovery of lithium mica of various particle sizes. It also has many advantages such as high concentrate quality, high sorting efficiency, low reagent dosage and wide applicability.

[0051] The technical solution of the present invention is further described below by specific examples. Those skilled in the art should understand that the examples are only to help understand the present invention and should not be regarded as specific limitations of the present invention.

[0052] Example 1

[0053] The experimental object is a lithium mica mine in Jiangxi. The process mineralogy study shows that the original ore belongs to the porcelain stone type lithium mica ore, with a Li2O grade of 0.43%. The main valuable mineral is lithium mica, lithium is mainly contained in lithium mica, the main gangue minerals are quartz and potassium-sodium feldspar, and the associated mud minerals are feldspar, montmorillonite and other clay minerals. The on-site desludging amount is about 10%. The chemical analysis of the original ore is shown in Table 1. The flotation system is as follows: Figure 1 shown.

[0054]

[0055] Table 1 Chemical analysis results of the raw ore

[0056] The experimental steps are as follows:

[0057] (1) The raw ore was fed into a ball mill at a pulp concentration of 40%, 500 g / t of sodium hexametaphosphate was added, the grinding time was 5 min, and the ore was passed through a 40-mesh sieve to obtain flotation pulp.

[0058] (2) The ore pulp obtained in step (1) was added to a flotation machine, 450 g / t of collector JL-1 was added, and flotation was performed after stirring for 5 min.

[0059] (3) The foam product in step (2) was subjected to two-stage selection, wherein the amounts of sodium hexametaphosphate used in the two-stage selection were 350 g / t and 250 g / t, respectively; the selected tailings were combined and scavenged, wherein the amount of sodium hexametaphosphate used was 200 g / t, the amount of collector JL-1 used was 150 g / t, and the stirring time after adding the drugs was 3 min, thereby finally obtaining lithium concentrate 1.

[0060] (4) The slurry product in step (2) was subjected to a one-roughing, two-fine, two-scavenging beneficiation process, wherein the amount of sodium hexametaphosphate used in the roughing process was 350 g / t, and the amount of collector JL-2 was 400 g / t; the amounts of sodium hexametaphosphate used in the two-stage fine process were 300 g / t and 200 g / t, respectively; the amounts of sodium hexametaphosphate used in the two-stage scavenging process were 250 g / t and 200 g / t, and the amounts of collector JL-2 were 200 g / t and 150 g / t, respectively. The stirring time after adding the drugs was 3 min, and lithium concentrate 2 was finally obtained.

[0061] Comparative Example 1-1

[0062] The difference between Comparative Example 1-1 and Example 1 is that the collector in Comparative Example 1 is only JL-1, the flotation system is one coarse, two fines and one sweep, the medium ore returns to the previous flotation process, and the reagent system is as follows: the amount of sodium hexametaphosphate in the roughing is 1200g / t, the amount of the collector is 600g / t, and the amounts of sodium hexametaphosphate in the two stages of fine selection are 600g / t and 400g / t respectively; the amount of sodium hexametaphosphate in the sweeping is 400g / t, the amount of the collector is 250g / t, and the stirring time is 3min.

[0063] Comparative Example 1-2

[0064] The difference between Comparative Example 1-2 and Example 1 is that the collector in Comparative Example 1 is only JL-2, the flotation system is one coarse, two fines and one sweep, the medium ore returns to the previous flotation process, and the reagent system is as follows: the amount of sodium hexametaphosphate in the roughing is 800g / t, the amount of the collector is 650g / t, and the amounts of sodium hexametaphosphate in the two stages of fine selection are 600g / t and 400g / t respectively; the amount of sodium hexametaphosphate in the sweeping is 400g / t, the amount of the collector is 300g / t, and the stirring time is 3min.

[0065]

[0066] Table 2 Flotation data of porcelain stone type lepidolite

[0067] Example 2

[0068] The experimental object is a lithium mica mine in Jiangxi. The process mineralogy study shows that the original ore belongs to the porcelain clay type lithium mica ore, with a Li2O grade of 0.55%. The main valuable mineral is lithium mica, lithium is mainly contained in lithium mica, the main gangue minerals are quartz and potassium-sodium feldspar, and the mud minerals include feldspar, montmorillonite, kaolin and other clay minerals. The on-site desludging amount is about 20%. The chemical analysis of the original ore is shown in Table 3. The flotation system is as follows: Figure 1 shown.

[0069] Table 3 Chemical analysis results of the raw ore

[0070]

[0071] The experimental steps are as follows:

[0072] (1) The raw ore was fed into a ball mill at a pulp concentration of 40%, 800 g / t of sodium hexametaphosphate was added, the grinding time was 3 min, and the ore was passed through a 40-mesh sieve to obtain a flotation pulp.

[0073] (2) The ore pulp obtained in step (1) was added to a flotation machine, 500 g / t of collector JL-1 was added, and flotation was performed after stirring for 10 min.

[0074] (3) The foam product in step (2) is subjected to two-stage selection, wherein the amounts of sodium hexametaphosphate used in the two-stage selection are 400 g / t and 300 g / t, respectively; the selected tailings are combined and scavenged, wherein the amount of sodium hexametaphosphate used is 200 g / t, the amount of collector JL-1 used is 200 g / t, and the stirring time after adding the drugs is 5 min, thereby obtaining lithium concentrate 1.

[0075] (4) The slurry product in step (2) was subjected to a one-roughing, two-fine, two-scavenging beneficiation process, wherein the amount of sodium hexametaphosphate used in the roughing process was 500 g / t, and the amount of collector JL-2 was 400 g / t; the amounts of sodium hexametaphosphate used in the two-stage fine process were 300 g / t and 200 g / t, respectively; the amounts of sodium hexametaphosphate used in the two-stage scavenging process were 250 g / t and 200 g / t, and the amounts of collector JL-2 were 200 g / t and 150 g / t, respectively. The stirring time after adding the drugs was 5 min to obtain lithium concentrate 2.

[0076] Comparative Example 2-1

[0077] The difference between Comparative Example 1-1 and Example 1 is that the collector in Comparative Example 1 is only JL-1, the flotation system is one coarse, two fines and one sweep, the medium ore returns to the previous flotation process, and the reagent system is as follows: the amount of sodium hexametaphosphate in the roughing is 1500g / t, the amount of collector is 700g / t, and the amounts of sodium hexametaphosphate in the two stages of fine selection are 650g / t and 450g / t respectively; the amount of sodium hexametaphosphate in the sweeping is 500g / t, the amount of collector is 350g / t, and the stirring time is 5min.

[0078] Comparative Example 2-2

[0079] The difference between Comparative Example 1-2 and Example 1 is that in Comparative Example 1, the collector is only JL-2, the flotation system is one coarse, two fines and one sweep, the medium ore returns to the previous flotation process, and the reagent system is as follows: the amount of sodium hexametaphosphate in the roughing is 1000g / t, the amount of the collector is 700g / t, and the amounts of sodium hexametaphosphate in the two stages of fine selection are 650g / t and 450g / t respectively; the amount of sodium hexametaphosphate in the sweeping is 500g / t, the amount of the collector is 400g / t, and the stirring time is 5min.

[0080]

[0081] Table 4 Flotation data of china clay type lithium mica

[0082] It can be seen from Table 2 and Table 4 that compared with the conventional one-rough two-fine one-sweep flotation process, the process of the present invention has more advantages in product quality. For low-grade (Li2O wt.% <0.5%) or high mud (demud amount ≈ 20%) lithium mica ore, a recovery rate of more than 85% can be achieved, and the enrichment ratio exceeds 6.5. Comparing the recovery of lithium concentrates 1 and 2 in the table with Examples 1 and 2, it can be seen that the grade of lithium concentrate 1 is close to that of the concentrate product of Comparative Example 1, but the grade of lithium concentrate 2 is higher than that of Comparative Example 2, and the total yield is higher than the yield of a single reagent, showing the synergistic effect between reagents, indicating that the method can effectively improve the recovery of lithium mica.

[0083] In summary, the desludging step can be omitted when flotation of lepidolite is performed by the method of the present invention, and no pH adjuster needs to be added during flotation. For low-grade, high-mud lepidolite ore, the total recovery rate of Li2O in the flotation concentrate exceeds 85%, which effectively avoids the challenges of Li2O loss that may be caused in the traditional flotation process, safety and environmental problems in a strongly acidic environment, and complex reagent systems, high costs, and difficult tailings treatment. It has the characteristics of green and environmental protection, realizes the efficient recovery of lepidolite in neutral flotation pulp, and demonstrates its value and potential in practical applications.

[0084] The above description is only a preferred embodiment of the present invention, and does not limit the patent scope of the present invention. All equivalent structural changes made by using the contents of the present invention specification and drawings under the concept of the present invention, or directly / indirectly applied in other related technical fields are included in the patent protection scope of the present invention.

Claims

1. A floatable separation process for mud-containing lithium mica, It is characterized in that The iso-floatable separation process of mud-containing lithium mica comprises: S1, mixing the raw ore with sodium hexametaphosphate and then finely grinding it through a mill; S2, adding collector JL-1 to the grinding product for flotation to obtain foam product and pulp product; S3, the foam product in step S2 is subjected to two-stage selection with sodium hexametaphosphate as an inhibitor to obtain lithium concentrate 1, the selected tailings are scavenged with JL-1 as a collector and sodium hexametaphosphate as an inhibitor, the scavenged foam product is returned to the first stage of selection, and the remaining product forms tailings; S4. The pulp product in step S2 is subjected to a one-rough, two-fine, two-sweep flotation process using JL-2 as a collector and sodium hexametaphosphate as a depressant to obtain lithium concentrate and tailings. The tailings and the tailings in step S3 together form the final tailings, and the intermediate ores at each level are returned to the previous flotation process.

2. The isofloatable separation process of muddy lithium mica according to claim 1, It is characterized in that The raw ore is lepidolite, and the raw ore Li 2 The grade of O is between 0.2% and 1.2%, and the mass proportion of -325 mesh minerals in the original ore is between 5% and 35%.

3. The isofloatable separation process of muddy lithium mica according to claim 1, It is characterized in that The flotation collector JL-1 includes at least one of dodecylamine, sodium oleate, sodium dodecyl sulfonate, dodecylamine polyoxyethylene ether and tributyl phosphate.

4. The isofloatable separation process of muddy lithium mica according to claim 1, It is characterized in that The JL-2 includes at least one of dodecylamine, sodium linoleate, sodium dodecylsulfonate, octadecylamine polyoxyethylene ether and polyethylene glycol.

5. The isofloatable separation process of muddy lithium mica according to claim 1, It is characterized in that In steps S2, S3 and S4, the pH range of the slurry is controlled to be 6-8.

6. The isofloatable separation process of muddy lithium mica according to claim 1, It is characterized in that In step S1, the amount of sodium hexametaphosphate used is 200 g / t-1000 g / t.

7. The isofloatable separation process of muddy lithium mica according to claim 1, It is characterized in that In step S2, the amount of JL-1 used is 300 g / t-800 g / t.

8. The isofloatable separation process of muddy lithium mica according to claim 1, It is characterized in that In step S3, the amount of sodium hexametaphosphate is 200g / t-500g / t, and the amount of collector JL-1 is 100g / t-300g / t.

9. The isofloatable separation process of muddy lithium mica according to claim 1, It is characterized in that In step S4, the amount of sodium hexametaphosphate used in the roughing process is 100g / t-500g / t, and the amount of collector JL-2 used is 200g / t-600g / t; the amount of sodium hexametaphosphate used in the cleaning process is 200g / t-500g / t; The dosage of sodium hexametaphosphate in the scavenging process is 100g / t-300g / t, and the dosage of collector JL-2 is 100g / t-300g / t.

Images