Beneficiation and desliming method for spodumene ore

Abstract

The invention discloses a spodumene ore beneficiation and desliming method which comprises the following steps: crushing spodumene raw ore into proper granularity, adding 2, 5-furandimethanol and modified ethyl cellulose, and carrying out ball milling to obtain raw ore pulp; the raw ore pulp is put into a hydrocyclone to be subjected to cyclone desliming twice, and deslimed spodumene ore is obtained; and putting the deslimed spodumene ore into a flotation machine, adding modified oleic acid, oxidized paraffin soap and sodium carbonate, carrying out one-time roughing, three-time concentration and two-time scavenging, and then filtering and dehydrating to obtain spodumene concentrate. The desliming effect can be improved by adding modified cellulose obtained by mixing and modifying cellulose and 2-hydroxyphosphonoacetic acid through plasmas into the ore grinding liquid, and the flotation effect can be improved by adding modified oleic acid obtained by mixing and modifying oleic acid, polyethylene glycol, alkyl glycoside and propionic acid into the flotation liquid. The beneficiation and desliming effects are good, the yield of the prepared spodumene concentrate, the LiO2 grade and the LiO2 recovery rate are high, and the adopted raw materials are environmentally friendly and degradable.

Description

Technical Field

[0001] The present invention relates to the technical field of ore dressing and processing, and particularly relates to a method for desliming spodumene ore in ore dressing. Background Technique

[0002] Lithium is known as the "energy metal of the 21st century". With the rapid development of the aviation, aerospace, and new energy industries, lithium, as an important strategic resource, has an increasing demand. Spodumene is an important lithium ore resource and an important ore source of lithium.

[0003] Spodumene ore is a silicate mineral, often symbiotic with minerals such as quartz, feldspar, and mica, and is prone to weathering, resulting in the easy slime formation of spodumene minerals during the crushing and grinding process. Spodumene ore contains elements such as silicon, aluminum, and lithium. Under specific geological and chemical environments, these elements cause changes in the chemical composition and properties of spodumene minerals, thus exacerbating the slime formation phenomenon of spodumene. The slime formation of spodumene ore will affect the ore dressing process, thereby affecting the grade and recovery rate of spodumene concentrate. Therefore, spodumene ore is usually subjected to desliming treatment before ore dressing to eliminate the influence of ore slime on ore dressing operations.

[0004] At present, the desliming methods on the market have simple processes and incomplete desliming, resulting in low grades and low recovery rates of lithium concentrate during the subsequent ore dressing process of spodumene ore.

[0005] Flotation is a common method for separating minerals by utilizing the different physical and chemical properties of the surface of spodumene ore. It mainly selects lithium concentrate by adding reagents such as collectors and frothers. At present, in the flotation process of spodumene ore on the market, the flotation effect is not ideal, and the grades and recovery rates of lithium concentrate are relatively low.

[0006] Therefore, there is an urgent need to provide a method for desliming spodumene ore in ore dressing to solve the problems of incomplete desliming of spodumene ore and poor flotation effect, thereby improving the grade and recovery rate of lithium concentrate. Summary of the Invention

[0007] The purpose of the present invention is to provide a method for desliming spodumene ore in ore dressing to solve the problems of incomplete desliming of spodumene ore and poor flotation effect, resulting in low grades and low recovery rates of spodumene concentrate as mentioned in the above background technique.

[0008] To achieve the above purpose, the present invention provides the following technical solution: A method for desliming spodumene ore in ore dressing, comprising the following steps:

[0009] S1. Grinding: (1) Preparation of modified ethyl cellulose: Mix ethyl cellulose and 2-hydroxyphosphonoacetic acid in a mass ratio of 8-10:1, and then place them in a plasma device for treatment for 20-25 minutes to obtain modified ethyl cellulose. (2) Ball milling of spodumene: Crush the original spodumene ore into an appropriate particle size, then place it in a ball mill, add water, 2,5-furandimethanol, and modified ethyl cellulose for ball milling to obtain the original ore pulp. Grind it until the particle size fineness of -0.08 mm ( -0.08 mm represents that the particle size fineness is less than or equal to 0.08 mm) accounts for 75%-90%, and among them, 0.04-0.08 mm accounts for 40%-60%.

[0010] S2. Desliming: Place the original ore pulp after ball milling into a hydrocyclone for primary hydrocyclone desliming to obtain primary coarse ore and primary overflow; perform secondary hydrocyclone desliming on the primary overflow to obtain secondary coarse ore and secondary overflow; mix the primary coarse ore and secondary coarse ore to obtain deslimed spodumene ore.

[0011] S3. Flotation: (1) Preparation of modified oleic acid: Weigh 50-55 parts by weight of oleic acid, 15-18 parts by weight of polyethylene glycol, 10-12 parts by weight of alkyl glycoside, 8-10 parts by weight of propionic acid, and 40-45 parts by weight of water, mix and stir, then place them in a reaction kettle, and treat them at 65-70 °C for 25-28 minutes to obtain modified oleic acid. (2) Mineral processing: Place the deslimed spodumene ore into a flotation machine, add modified oleic acid and oxidized paraffin soap for one rough selection, three fine selections, and two scavengings, and then filter and dehydrate to obtain spodumene concentrate.

[0012] As a preferred technical solution of the present invention, calculated based on the original spodumene ore, the addition amount of 2,5-furandimethanol is 100-120 g / t, the addition amount of modified ethyl cellulose is 90-110 g / t, and the addition amount of water is 5-6 times the mass of the original spodumene ore.

[0013] As a preferred technical solution of the present invention, the charge density of the plasma device is 950-960 / cm 3 , the gas flow rate is 1.2-1.5 L / min, the temperature is 55-58 °C, and the pressure is 620-650 Pa.

[0014] As a preferred technical solution of the present invention, during the primary hydrocyclone process, the diameter of the hydrocyclone is 300 mm, the feeding pressure is 0.08-0.12 MPa, during the secondary hydrocyclone process, the diameter of the hydrocyclone is 150 mm, and the feeding pressure is 0.12-0.18 MPa.

[0015] As a preferred technical solution of the present invention, during the rough selection, fine selection, and scavenging processes of the deslimed spodumene ore, water is added to prepare a pulp concentration of 25%-30%.

[0016] As a preferred technical solution of the present invention, in the roughing process, the amount of modified oleic acid added is 100-120 g / t, the amount of oxidized paraffin soap added is 90-110 g / t, and the amount of sodium carbonate added is 120-140 g / t, calculated based on the solid spodumene ore; in the concentrating process, the amount of modified oleic acid added is 80-100 g / t, the amount of oxidized paraffin soap added is 60-70 g / t, and the amount of sodium carbonate added is 100-120 g / t, calculated based on the solid spodumene ore; in the scavenging process, the amount of modified oleic acid added is 60-80 g / t, the amount of oxidized paraffin soap added is 50-60 g / t, and the amount of sodium carbonate added is 80-100 g / t, calculated based on the solid spodumene ore.

[0017] Compared with the prior art, the present invention has the following beneficial effects:

[0018] 1. The present invention adds 2,5-furan dimethanol and modified ethyl cellulose during the ball milling process of spodumene ore. 2,5-furan dimethanol can promote the dispersion and suspension of spodumene ore particles in water, improve the dispersion effect, and prevent agglomeration, thereby contributing to the ball milling effect of spodumene ore, reducing the ball milling time, saving energy consumption, and further improving the desludging effect of spodumene ore in a hydrocyclone. Ethyl cellulose and 2-hydroxyphosphoacetic acid are mixed and then treated in a plasma device, which can improve the molecular structure of ethyl cellulose, and can introduce groups such as phosphate and carbonyl in 2-hydroxyphosphoacetic acid into ethyl cellulose, thereby improving the stability and dispersibility of ethyl cellulose and improving the grinding effect. At the same time, the addition of modified ethyl cellulose can appropriately improve the viscosity of the ore pulp, making the movement of the grinding medium in the ore pulp more uniform, improving the uniformity and efficiency of grinding, and reducing energy consumption. When 2,5-furan dimethanol and modified ethyl cellulose are used together, they can play a synergistic role, improve the interaction between lithium ore particles, enhance the dispersion effect, make the grinding effect better, and make the desludging effect better, thereby improving the desludging efficiency of spodumene and reducing the loss rate of spodumene. In addition, both 2,5-furan dimethanol and modified ethyl cellulose are biodegradable and environmentally friendly and safe.

[0019] 2. The present invention modifies oleic acid, polyethylene glycol, alkyl glucoside, propionic acid and water in a reactor, and the carboxyl group and alcoholic hydroxyl group in the oleic acid and the hydroxyl groups in the polyethylene glycol, alkyl glucoside and propionic acid undergo esterification and etherification reactions, so that the modified oleic acid has better dispersing effect, better surface activity and foaming performance, so that the modified oleic acid produces more delicate, uniform and stable foam in the flotation process, and has a stronger collection performance for spodumene, thereby improving the grade and recovery rate of lithium concentrate. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of the process flow of the present invention. DETAILED DESCRIPTION

[0021] 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.

[0022] like Figure 1 As shown, a method for beneficiating and desliming spodumene ore comprises the following steps: S1. Grinding: crushing the spodumene ore into suitable particle sizes and placing it in a ball mill, adding water, 2,5-furan dimethanol, and modified ethyl cellulose for ball milling to obtain ore pulp. S2. Desliming: placing the milled ore pulp in a hydrocyclone for a first hydrocyclone desliming to obtain a primary coarse ore and a primary overflow; performing a second hydrocyclone desliming on the primary overflow to obtain a secondary coarse ore and a secondary overflow; mixing the primary coarse ore and the secondary coarse ore to obtain deslimed spodumene ore. S3. Flotation: placing the deslimed spodumene ore in a flotation machine, adding modified oleic acid, oxidized paraffin soap, and sodium carbonate for a first roughing selection, a third fine selection, and two scavenging selections, and then filtering and dehydrating to obtain spodumene concentrate.

[0023] 2,5-Furan dimethanol has an alcohol hydroxyl functional group, is hydrophilic and reactive, and can promote the dispersion and suspension of spodumene ore particles in water, improve the dispersion effect, and prevent agglomeration, thereby contributing to the ball milling effect of spodumene ore, reducing the ball milling time, saving energy consumption, and further improving the desludging effect of spodumene ore in the hydrocyclone. At the same time, 2,5-Furan dimethanol is a biodegradable organic compound that is safe, non-toxic, and environmentally friendly.

[0024] After ethyl cellulose and 2-hydroxyphosphoacetic acid are mixed and treated in a plasma device, the high-energy particles in the plasma can impact the molecular chains of ethyl cellulose and 2-hydroxyphosphoacetic acid, change their molecular weight distribution and properties, introduce the phosphate group, carbonyl group and other groups in 2-hydroxyphosphoacetic acid into ethyl cellulose, improve the stability and dispersibility of ethyl cellulose, and improve the grinding effect. At the same time, the addition of modified ethyl cellulose can appropriately improve the viscosity of the slurry, make the movement of the grinding medium in the slurry more uniform, improve the uniformity and efficiency of grinding, and reduce energy consumption.

[0025] When 2,5-furan dimethanol and modified ethyl cellulose are used together, they can play a synergistic role, improve the interaction between lithium ore particles, enhance the dispersion effect, make the grinding effect better, and make the desludging effect better, thereby improving the desludging efficiency of spodumene and reducing the loss rate of spodumene. In addition, both 2,5-furan dimethanol and modified ethyl cellulose are biodegradable and environmentally friendly and safe.

[0026] Polyethylene glycol is a non-ionic polymer compound with good stability, dispersibility and biocompatibility. Alkyl polyglycoside is a non-ionic surfactant with excellent surface activity and foam properties. Propionic acid regulates the pH value during the reaction process and can also inhibit the flotation of certain gangue minerals. In the present invention, oleic acid, polyethylene glycol, alkyl polyglycoside, propionic acid and water are subjected to modification treatment in a reaction kettle. The carboxyl group, alcohol hydroxyl group in oleic acid react with the hydroxyl groups in polyethylene glycol, alkyl polyglycoside and propionic acid to undergo esterification and etherification reactions, so that the modified oleic acid has a dispersing effect, and has better surface activity and foam properties, making the modified oleic acid produce finer, more uniform and stable foam during the flotation process, having a stronger collecting performance for spodumene, and improving the grade and recovery rate of spodumene concentrate.

[0027] During the grinding process of lithium ore, the fineness of the grinding particle size is controlled such that -0.08 mm accounts for 75% - 90%, and among them, 0.04 - 0.08 mm accounts for 40% - 60%. Suitable fineness is beneficial to the desliming treatment and beneficiation effect. When the grinding fineness is too high, the spodumene particles will be over-refined, which may lead to the phenomenon of mineral slime. Mineral slime will reduce the flotation effect, thereby affecting the recovery rate of lithium, and too high grinding fineness increases the energy consumption. When the grinding fineness is too low, the spodumene particles are larger and are not easy to float during the flotation process, affecting the beneficiation effect.

[0028] In the present invention, the spodumene raw ore pulp is subjected to cyclone desliming in two series-connected hydrocyclones, improving the desliming effect. At the same time, during the flotation process, one rough selection, three fine selections and two scavenging selections are carried out, further improving the grade and recovery rate of spodumene concentrate.

[0029] The raw materials used in the present invention during the grinding and desliming processes are all environmentally friendly and biodegradable. While achieving the desliming effect and improving the grade and recovery rate of lithium concentrate, it is environmentally friendly.

[0030] The raw materials used in the present invention are all commercially available raw materials.

[0031] Example 1:

[0032] A beneficiation desliming method for spodumene ore, comprising the following steps:

[0033] S1. Grinding: (1) Preparation of modified ethyl cellulose: Mix ethyl cellulose and 2-hydroxyphosphonoacetic acid in a mass ratio of 8:1 and place them in a plasma device for treatment for 20 min to obtain modified ethyl cellulose. The charge density of the plasma device is 960 / cm 3The gas flow rate is 1.5 L / min, the temperature is 58 °C, and the pressure is 650 Pa. (2) Grinding spodumene: The original spodumene ore is crushed into an appropriate particle size and then placed in a ball mill, and water, 2,5-furandimethanol, and modified ethyl cellulose are added for ball milling to obtain the original ore pulp. The grinding is carried out until the particle size fineness of -0.08 mm accounts for 75% - 90%, among which 0.04 - 0.08 mm accounts for 40% - 60%. Calculated based on the original spodumene ore, the addition amount of 2,5-furandimethanol is 100 g / t, the addition amount of modified ethyl cellulose is 90 g / t, and the addition amount of water is 5 times the mass of the original spodumene ore.

[0034] S2. Dewatering: The original ore pulp after ball milling is placed in a hydrocyclone for primary hydrocyclone dewatering to obtain primary coarse ore and primary overflow; the primary overflow is subjected to secondary hydrocyclone dewatering to obtain secondary coarse ore and secondary overflow; the primary coarse ore and secondary coarse ore are mixed to obtain dewatered spodumene ore. During the primary hydrocyclone process, the diameter of the hydrocyclone is 300 mm and the feeding pressure is 0.08 MPa. During the secondary hydrocyclone process, the diameter of the hydrocyclone is 150 mm and the feeding pressure is 0.12 MPa.

[0035] S3. Flotation: (1) Preparation of modified oleic acid: Weigh 50 parts by weight of oleic acid, 15 parts by weight of polyethylene glycol, 10 parts by weight of alkyl glycoside, 8 parts by weight of propionic acid, and 40 parts by weight of water, mix and stir, and then place them in a reaction kettle and treat them at 65 °C for 28 min to obtain modified oleic acid. (2) Mineral processing: The dewatered spodumene ore is placed in a flotation machine and added with modified oleic acid, oxidized paraffin soap, and sodium carbonate for one rough selection, three fine selections, and two scavenging selections, and then filtered and dehydrated to obtain spodumene concentrate. During the rough selection, fine selection, and scavenging selection processes, water is added to prepare a pulp concentration of 25%. During the rough selection process, calculated based on the solid spodumene ore, the addition amount of modified oleic acid is 100 g / t, the addition amount of oxidized paraffin soap is 90 g / t, and the addition amount of sodium carbonate is 120 g / t; during the fine selection process, calculated based on the solid spodumene ore, the addition amount of modified oleic acid is 80 g / t, the addition amount of oxidized paraffin soap is 60 g / t, and the addition amount of sodium carbonate is 100 g / t; during the scavenging selection process, calculated based on the solid spodumene ore, the addition amount of modified oleic acid is 60 g / t, the addition amount of oxidized paraffin soap is 50 g / t, and the addition amount of sodium carbonate is 80 g / t.

[0036] Example 2:

[0037] A method for ore dressing and dewatering of spodumene ore, comprising the following steps:

[0038] S1. Grinding: (1) Preparation of modified ethyl cellulose: Ethyl cellulose and 2-hydroxyphosphonoacetic acid are mixed in a mass ratio of 10:1 and then placed in a plasma device for treatment for 25 min to obtain modified ethyl cellulose. The charge density of the plasma device is 950 / cm 3The gas flow rate is 1.2 L / min, the temperature is 55 °C, and the pressure is 620 Pa. (2) Ball milling of spodumene: The original spodumene ore is crushed into an appropriate particle size and then placed into a ball mill, and water, 2,5-furandimethanol, and modified ethyl cellulose are added for ball milling to obtain the original ore pulp. The grinding is carried out until the particle size fineness of -0.08 mm accounts for 75% - 90%, among which 0.04 - 0.08 mm accounts for 40% - 60%. Calculated based on the original spodumene ore, the addition amount of 2,5-furandimethanol is 120 g / t, the addition amount of modified ethyl cellulose is 110 g / t, and the addition amount of water is 6 times the mass of the original spodumene ore.

[0039] S2. Desliming: The original ore pulp after ball milling is placed into a hydrocyclone for primary hydrocyclone desliming to obtain primary rough ore and primary overflow; the primary overflow is subjected to secondary hydrocyclone desliming to obtain secondary rough ore and secondary overflow; the primary rough ore and secondary rough ore are mixed to obtain deslimed spodumene ore. During the primary hydrocyclone process, the diameter of the hydrocyclone is 300 mm, and the feeding pressure is 0.12 MPa. During the secondary hydrocyclone process, the diameter of the hydrocyclone is 150 mm, and the feeding pressure is 0.18 MPa.

[0040] S3. Flotation: (1) Preparation of modified oleic acid: Weigh 55 parts by weight of oleic acid, 18 parts by weight of polyethylene glycol, 12 parts by weight of alkyl polyglycoside, 10 parts by weight of propionic acid, and 45 parts by weight of water, mix and stir, and then place them in a reaction kettle. Treat at 70 °C for 25 min to obtain modified oleic acid. (2) Ore dressing: The deslimed spodumene ore is placed into a flotation machine and added with modified oleic acid, oxidized paraffin soap, and sodium carbonate for one rough selection, three fine selections, and two scavenging selections, and then filtered and dehydrated to obtain spodumene concentrate. During the rough selection, fine selection, and scavenging selection processes, water is added to prepare a pulp concentration of 30%. During the rough selection process, calculated based on the solid spodumene ore, the addition amount of modified oleic acid is 120 g / t, the addition amount of oxidized paraffin soap is 110 g / t, and the addition amount of sodium carbonate is 140 g / t; during the fine selection process, calculated based on the solid spodumene ore, the addition amount of modified oleic acid is 100 g / t, the addition amount of oxidized paraffin soap is 70 g / t, and the addition amount of sodium carbonate is 120 g / t; during the scavenging selection process, calculated based on the solid spodumene ore, the addition amount of modified oleic acid is 80 g / t, the addition amount of oxidized paraffin soap is 60 g / t, and the addition amount of sodium carbonate is 100 g / t.

[0041] Comparative Example 1:

[0042] The difference from Example 1 is that 2,5-furandimethanol is not added.

[0043] Comparative Example 2:

[0044] The difference from Example 1 is that modified ethyl cellulose is not added.

[0045] Comparative Example 3:

[0046] The difference from Example 1 is that ethyl cellulose is not subjected to modification treatment.

[0047] Comparative Example 4:

[0048] The difference from Example 1 is that modified oleic acid is not added.

[0049] Comparative Example 5:

[0050] The difference from Example 1 is that oleic acid is not subjected to modification treatment.

[0051] The slimes removed in Example 1, Example 2 and Comparative Examples 1, 2 and 3 were subjected to index detection, and the results are shown in Table 1.

[0052] Table 1: Slime Index Detection Table

[0053] Sludge Yield (%) <![CDATA[LiO2 grade (%)]]> <![CDATA[Recovery rate of LiO2(%)]]> Example 1 5.12 0.21 1.85 Example 2 5.34 0.24 1.76 Comparative Example 1 7.23 0.71 3.58 Comparative Example 2 6.98 0.63 3.67 Comparative Example 3 6.73 0.48 2.79

[0054] As shown in Table 1, the slime yield, LiO2 grade and LiO2 recovery rate in the examples are all low, and the slime yield, LiO2 grade and LiO2 recovery rate in the comparative examples are also low. The slime yields in Comparative Examples 1, 2 and 3 are 29.2%, 26.6% and 23.9% higher than that in Example 1 respectively. The LiO2 grades in the slimes of Comparative Examples 1, 2 and 3 are 70.4%, 66.7% and 56.3% higher than that in Example 1 respectively. The LiO2 recovery rates in the slimes of Comparative Examples 1, 2 and 3 are 48.3%, 49.6% and 33.7% higher than that in Example 1 respectively.

[0055] 2,5-Furandimethanol can promote the dispersion and suspension of spodumene ore particles in water, improve the dispersion effect, prevent agglomeration, reduce the slime yield, slime LiO2 grade and slime LiO2 recovery rate, and thus improve the desliming effect of spodumene ore in the hydrocyclone. Modifying ethyl cellulose can improve the stability and dispersibility of ethyl cellulose, improve the grinding effect. At the same time, the addition of modified ethyl cellulose can appropriately improve the viscosity of the pulp, make the movement of the grinding medium in the pulp more uniform, improve the uniformity and efficiency of grinding, and thus reduce the slime yield, slime LiO2 grade and slime LiO2 recovery rate, and improve the desliming effect of spodumene.

[0056] The spodumene concentrates prepared in Example 1, Example 2 and Comparative Examples 1, 2, 3, 4 and 5 were subjected to quality detection, and the results are shown in Table 2.

[0057] Table 2: Spodumene Concentrate Quality Detection Table

[0058] Yield (%) <![CDATA[LiO2 grade (%)]]> <![CDATA[Recovery rate of LiO2 (%)]]> Raw spodumene ore 100 1.23 100 Example 1 14.87 6.84 80.43 Example 2 15.15 7.04 82.32 Comparative Example 1 13.56 5.34 70.53 Comparative Example 2 13.74 5.26 68.42 Comparative Example 3 14.21 6.13 74.96 Comparative Example 4 13.15 5.17 64.57 Comparative Example 5 14.18 5.85 72.48

[0059] As shown in Table 2, the raw ore yield of spodumene is 100%, the grade of LiO2 is 1.23%, and the recovery rate of LiO2 is 100%. In the examples, the yield, grade of LiO2, and recovery rate of LiO2 of spodumene concentrate are all higher than those in the comparative examples. In Comparative Examples 1, 2, 3, 4, and 5, the yields of spodumene concentrate are 8.8%, 7.6%, 4.4%, 11.6%, and 4.6% lower than that in Example 1, respectively. In Comparative Examples 1, 2, 3, 4, and 5, the grades of LiO2 in spodumene concentrate are 21.9%, 23.1%, 10.4%, 24.4%, and 14.5% lower than that in Example 1, respectively. In Comparative Examples 1, 2, 3, 4, and 5, the recovery rates of LiO2 in spodumene concentrate are 12.3%, 14.9%, 6.8%, 19.7%, and 9.9% lower than that in Example 1, respectively.

[0060] 2,5-Furandimethanol and modified ethyl cellulose can improve the de-sludging effect, reduce the loss rate of spodumene, and thus increase the yield, grade of LiO2, and recovery rate of LiO2 of spodumene concentrate. The modified oleic acid has a dispersing effect, and better surface activity and foaming properties, making the modified oleic acid produce finer, more uniform, and more stable foam during the flotation process, having a stronger collecting performance for spodumene, and increasing the yield, grade of LiO2, and recovery rate of LiO2 of spodumene concentrate.

[0061] In summary, the de-sludging effect of the spodumene ore in the present invention is good, the yield, grade of LiO2, and recovery rate of LiO2 of the prepared spodumene concentrate are high. At the same time, the raw materials used are all environmentally friendly and biodegradable, and the production operation is simple, which is suitable for popularization.

[0062] The above are only specific embodiments of the present invention, but the technical features of the present invention are not limited thereto. Any simple changes, equivalent replacements, or modifications made based on the present invention to solve substantially the same technical problems and achieve substantially the same technical effects are all covered by the protection scope of the present invention.

Claims

1. A method for beneficiating and desludging spodumene ore, characterized in that: The following steps are involved: S1. Grinding: The spodumene ore is crushed into suitable particle sizes and placed in a ball mill. Water, 2,5-furan dimethanol and modified ethyl cellulose are added for ball milling to obtain ore slurry. The ore is ground to a particle size of -0.08 mm accounting for 75% to 90%, of which 0.04 to 0.08 mm accounts for 40% to 60%; S2. Desliming: The raw ore pulp after ball milling is placed in a hydrocyclone for a hydrocyclone desliming to obtain a primary coarse ore and an overflow; the primary overflow is subjected to a secondary hydrocyclone desliming to obtain a secondary coarse ore and a secondary overflow; the primary coarse ore and the secondary coarse ore are mixed to obtain a deslimed spodumene ore; S3. Flotation: Place the desludified spodumene ore into a flotation machine and add modified oleic acid, oxidized paraffin soap and sodium carbonate to perform one roughing selection, three fine selections and two scavenging selections, and then filter and dehydrate to obtain spodumene concentrate.

2. A method for desliming a spodumene ore according to claim 1, characterized in that: Calculated based on the spodumene ore, the added amount of 2,5-furan dimethanol is 100-120 g / t, the added amount of modified ethyl cellulose is 90-110 g / t, and the added amount of water is 5-6 times the mass of the spodumene ore.

3. A method for desliming a spodumene ore according to claim 1, characterized in that: The modified ethyl cellulose is prepared by the following method: ethyl cellulose and 2-hydroxyphosphoacetic acid are mixed in a mass ratio of 8 to 10:1, and then placed in a plasma device for treatment for 20 to 25 minutes to obtain the modified ethyl cellulose.

4. A method for desliming a spodumene ore according to claim 3, characterized in that: The charge density of the plasma equipment is 950-960 / cm 3 , gas flow rate is 1.2~1.5L / min, temperature is 55~58℃, and pressure is 620~650Pa.

5. A method for desliming a spodumene ore according to claim 1, characterized in that: The diameter of the hydrocyclone in the primary hydrocyclone process is 300 mm, and the feed pressure is 0.08-0.12 MPa. The diameter of the hydrocyclone in the secondary hydrocyclone process is 150 mm, and the feed pressure is 0.12-0.18 MPa.

6. A method for desliming a spodumene ore according to claim 1, characterized in that: The modified oleic acid is prepared by the following method: 50-55 parts by weight of oleic acid, 15-18 parts by weight of polyethylene glycol, 10-12 parts by weight of alkyl glycoside, 8-10 parts by weight of propionic acid and 40-45 parts by weight of water are weighed, mixed and stirred, and then placed in a reaction kettle, and treated at 65-70° C. for 25-28 minutes to obtain the modified oleic acid.

7. A method for desliming a spodumene ore according to claim 1, characterized in that: In the process of roughing, concentrating and scavenging of the desludging spodumene ore, water is added to prepare the ore pulp with a concentration of 25% to 30%.

8. A method for desliming a spodumene ore according to claim 1 or 7, characterized in that: In the roughing process, the amount of modified oleic acid added is 100-120 g / t, the amount of oxidized paraffin soap added is 90-110 g / t, and the amount of sodium carbonate added is 120-140 g / t based on the solid spodumene ore; In the above-mentioned concentration process, the amount of modified oleic acid added is 80-100 g / t, the amount of oxidized paraffin soap added is 60-70 g / t, and the amount of sodium carbonate added is 100-120 g / t based on the solid spodumene ore; In the scavenging process, based on the solid spodumene ore, the amount of modified oleic acid added is 60-80 g / t, the amount of oxidized paraffin soap added is 50-60 g / t, and the amount of sodium carbonate added is 80-100 g / t.

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