Flotation method for spodumene ore

Abstract

The invention relates to a mineral flotation technology, and discloses a spodumene ore flotation method which comprises the following steps: (1) mixing mineral aggregate with water, and grinding to obtain ore pulp I; (2) mixing the ore pulp I and a regulator I, and performing ultrasonic treatment to obtain ore pulp II; (3) the ore pulp II and a pulp mixing and collecting composition are mixed and mixed to obtain ore pulp III; and (4) the ore pulp III is subjected to flotation, and spodumene concentrate and tailing products are obtained. According to the method, the spodumene ore flotation pretreatment efficiency can be improved, the dosage of the regulator I in the pretreatment process is reduced, then the dehydration performance of spodumene ore flotation concentrate and tailing products can be improved, and recycling of spodumene ore beneficiation wastewater is achieved.

Description

Technical Field

[0001] The invention relates to mineral flotation technology, in particular to a spodumene ore flotation method. Background Art

[0002] Spodumene is one of the most important lithium-rich minerals and will be the main source of lithium extraction in my country for a long period of time in the future. In the flotation system of spodumene ore, spodumene and the main gangue minerals such as feldspar, quartz and mica are all silicate minerals. The chemical composition and crystal structure of these silicate minerals are similar, which makes the surface properties of these minerals similar and the dissolved components in aqueous solution are also similar, which makes flotation separation more difficult.

[0003] In order to improve the flotation separation efficiency of spodumene ore, sodium carbonate and sodium hydroxide need to be added as adjusters in the flotation process of spodumene ore, and mechanical stirring and slurry adjustment are carried out for a long time within the range of 11-12 in the slurry, so as to expand the surface difference between spodumene and gangue minerals. However, the long-term mechanical stirring pretreatment causes the stirring device to occupy a large amount of plant area, which greatly increases the investment cost of plant construction; in addition, the addition of a large amount of alkali causes the pH value of the spodumene concentrate and tailings to be high, and the sedimentation and dehydration performance is reduced, resulting in excessive use of flocculants in the tailings sedimentation stage, which in turn makes it difficult to dispose and reuse the spodumene flotation wastewater, which has a serious impact on the sustainability of spodumene ore resource development.

[0004] Therefore, it is necessary to optimize the pretreatment process, reduce the pretreatment alkalinity, improve the pretreatment efficiency, and reduce the stirring intensity and stirring time while ensuring the pretreatment and flotation effects. Summary of the invention

[0005] The purpose of the present invention is to overcome the problems of poor sedimentation and dehydration performance of flotation concentrate and tailings slurry in the prior art and difficulty in wastewater treatment and recycling, and to provide a spodumene ore flotation method, which can improve the efficiency of spodumene ore flotation pretreatment, reduce the amount of adjusting agent I used in the pretreatment process, and further improve the dehydration performance of spodumene ore flotation concentrate and tailings products, so as to realize the recycling of spodumene ore dressing wastewater.

[0006] In order to achieve the above object, the present invention provides a spodumene ore flotation method, comprising the following steps:

[0007] (1) mixing a mineral material with water and grinding the mixture to obtain a slurry I;

[0008] (2) mixing the slurry I and the adjusting agent I and performing ultrasonic treatment to obtain slurry II;

[0009] (3) mixing the slurry II with the slurry collecting composition to obtain slurry III;

[0010] (4) flotation the slurry III to obtain spodumene concentrate and tailings products.

[0011] Preferably, in step (1), the preparation process of the mineral material comprises: crushing the spodumene ore and screening out mineral particles with a particle size less than or equal to 2 mm.

[0012] Preferably, the grinding process comprises: grinding the mineral material to a fineness of -0.074 mm accounting for 65-80 wt%.

[0013] Preferably, the mass fraction of the mineral material in the slurry I is 60-70%.

[0014] Preferably, sodium carbonate is added to the ore before said grinding.

[0015] Preferably, the amount of sodium carbonate used is 800-1500 g per ton of the mineral material.

[0016] Preferably, in step (2), the conditions for the ultrasonic treatment include at least: an ultrasonic frequency of 45-100 kHz, an ultrasonic power of 1500-2500 W, a rotation speed of 500-6000 rpm, and a time of 5-20 min.

[0017] Preferably, the amount of the adjusting agent I is 400-1000 g per ton of the ore.

[0018] Preferably, the adjusting agent I is sodium hydroxide and / or sodium carbonate.

[0019] Preferably, the mass fraction of the mineral material in the slurry II is 20-30%.

[0020] Preferably, in step (3), the slurry adjustment and collecting composition contains a slurry adjustment and collecting agent and an activator.

[0021] Preferably, the pulping collector contains vegetable oleic acid and sodium hydroxide, and the activator is calcium chloride.

[0022] Preferably, in the slurry adjusting collector, the weight ratio of the vegetable oleic acid to the sodium hydroxide is 5-8:1.

[0023] Preferably, with respect to each ton of the mineral material, the dosage of the activator is 10-300 g, and the dosage of the slurry adjustment collector is 500-1400 g.

[0024] Preferably, the slurry adjustment process includes: adding the activator to the ore slurry II to perform slurry adjustment I, and then adding the slurry adjustment collector to perform slurry adjustment II.

[0025] Preferably, the conditions of the slurry adjustment I and the slurry adjustment II each independently include at least: a rotation speed of 1500-2500 rpm and a time of 4-6 min.

[0026] Preferably, the mass fraction of the mineral material in the slurry III is 20-30%.

[0027] Preferably, in step (4), the flotation process comprises:

[0028] S1, roughing the slurry III to obtain spodumene concentrate I and tailings product I;

[0029] S2. The spodumene concentrate I and the additive are mixed and beneficiated at least twice to obtain the spodumene concentrate, and the tailings product I and the scavenging collector are mixed and beneficiated at least once to obtain the tailings product; the additive is an adjusting agent II and / or a beneficiating collector.

[0030] Preferably, in step S1, the roughing is aeration flotation, and the roughing time is 2-5 minutes.

[0031] Preferably, in step S2, the cleaning is performed twice, and in each cleaning, the amount of the additive used is 100-500 g per ton of the ore.

[0032] Preferably, the scavenging is performed once, and in the scavenging, the amount of the scavenging collector used is 100-300 g per ton of the mineral material.

[0033] Preferably, both the concentration and the scavenging are aeration flotation, and the time of the aeration flotation is 2-5 minutes.

[0034] Through the above technical solution, the beneficial effects of the present invention are:

[0035] The spodumene ore flotation method provided by the present invention performs ultrasonic treatment after mixing ore pulp I and adjusting agent I, thereby significantly strengthening the selective dissolution of the spodumene ore surface during flotation pretreatment, increasing the surface property difference and floatability difference between the spodumene ore and gangue minerals, improving the efficiency of flotation pretreatment, and greatly shortening the flotation process; moreover, the ultrasonic treatment can reduce the dosage of the adjusting agent I during the flotation pretreatment, thereby reducing the pH of the flotation concentrate and tailings slurry of the spodumene ore, significantly improving the dehydration performance of the flotation tailings and concentrate products, and facilitating the disposal and recycling of spodumene ore dressing wastewater.

[0036] Other features and advantages of the present invention will be described in detail in the following detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] Figure 1It is a comparison diagram of the process flow of the spodumene ore flotation method provided by the present invention and the process flow of the traditional spodumene ore flotation method;

[0038] Figure 2 It is a process flow chart of the spodumene ore flotation method provided in Example 1. DETAILED DESCRIPTION

[0039] The specific embodiments of the present invention are described in detail below. It should be understood that the specific embodiments described herein are only used to illustrate and explain the present invention, and are not used to limit the present invention.

[0040] The endpoints and any values ​​of the ranges disclosed in this article are not limited to the precise ranges or values, and these ranges or values ​​should be understood to include values ​​close to these ranges or values. For numerical ranges, the endpoint values ​​of each range, the endpoint values ​​of each range and the individual point values, and the individual point values ​​can be combined with each other to obtain one or more new numerical ranges, which should be considered as specifically disclosed in this article.

[0041] The present invention provides a spodumene ore flotation method, comprising the following steps:

[0042] (1) mixing a mineral material with water and grinding the mixture to obtain a slurry I;

[0043] (2) mixing the slurry I and the adjusting agent I and performing ultrasonic treatment to obtain slurry II;

[0044] (3) mixing the slurry II with the slurry collecting composition to obtain slurry III;

[0045] (4) flotation the slurry III to obtain spodumene concentrate and tailings products.

[0046] The inventors of the present invention have found that by performing ultrasonic treatment after mixing the ore pulp I and the adjusting agent I, the selective dissolution of the surface of the spodumene ore during the flotation pretreatment process is significantly enhanced, the surface property difference and the floatability difference between the spodumene ore and the gangue mineral are increased, the efficiency of the flotation pretreatment is improved, and the flotation process flow is greatly shortened; moreover, the ultrasonic treatment can reduce the amount of the adjusting agent I used in the flotation pretreatment process, thereby reducing the pH of the flotation concentrate and tailings slurry of the spodumene ore, significantly improving the dehydration performance of the flotation tailings and concentrate products, and facilitating the disposal and recycling of the spodumene ore dressing wastewater.

[0047] The process flow of the spodumene ore flotation method provided by the present invention is compared with the process flow of the traditional spodumene ore flotation method as shown in the figure Figure 1 shown.

[0048] In the present invention, there is no particular restriction on the particle size of the ore, as long as flotation can be smoothly carried out. Preferably, in step (1), the preparation process of the ore comprises: crushing the spodumene ore, and screening out ore particles with a particle size less than or equal to 2 mm. The spodumene ore can be any kind of mined spodumene ore raw material. Preferably, the spodumene ore in the present invention adopts pegmatite spodumene.

[0049] According to the present invention, grinding can be performed by any grinding tool, preferably a ball mill. Preferably, the grinding process includes: grinding the mineral material to a fineness of -0.074 mm accounting for 65-80 wt%. In the present invention, the fineness of -0.074 mm refers to particles in the mineral material with a particle size less than or equal to 0.074 mm.

[0050] According to the present invention, preferably, the mass fraction of the ore in the slurry I is 60-70%. The inventors found that under this preferred embodiment, the efficiency of spodumene ore flotation can be improved.

[0051] In the present invention, the mass fraction of the mineral material in the ore pulp I refers to the percentage of the mineral material (dry weight) in the ore pulp I to the total weight of the entire ore pulp I.

[0052] Exemplarily, the specific process of grinding can be mixing the mineral material with water so that the mass fraction of the mineral material is 60-70%, and then grinding the mineral material until the fineness of the mineral material is -0.074mm and accounts for 65-80wt%; the specific process of grinding can also be mixing the mineral material with water, grinding the mineral material until the fineness of the mineral material is -0.074mm and accounts for 65-80wt%, and then mixing it with water so that the mass fraction of the mineral material is 60-70 to obtain slurry I.

[0053] In the present invention, there is no particular requirement for the grinding time, as long as the ore with a suitable particle size can be obtained. Preferably, the grinding time is 4-10 minutes, specifically 4 minutes, 6 minutes, 8 minutes, 10 minutes, or any value between the above two values.

[0054] According to the present invention, preferably, sodium carbonate is added to the ore before the grinding. The inventors found that under this preferred embodiment, the addition of sodium carbonate can improve the grinding efficiency of the ore.

[0055] According to the present invention, in order to further improve the grinding efficiency of the mineral material, preferably, the amount of the sodium carbonate used per ton of the mineral material is 800-1500g, specifically 800g, 1000g, 1200g, 1400g, 1500g, or any value between the foregoing two values.

[0056] According to the present invention, preferably, in step (2), the conditions of the ultrasonic treatment at least include: an ultrasonic frequency of 45-100kHz, specifically 45kHz, 60kHz, 80kHz, 100kHz, or any value between the aforementioned two values; an ultrasonic power of 1500-2500W, specifically 1500W, 2000W, 2500W, or any value between the aforementioned two values; a rotation speed of 500-6000rpm, further preferably 1500-2500rpm, specifically 1500rpm, 2000rpm, 2500rpm, or any value between the aforementioned two values; and a time of 5-20min, specifically 5min, 10min, 20min, or any value between the aforementioned two values. The inventors found that under this preferred embodiment, after the slurry I and the adjusting agent I are mixed, the introduction of ultrasonic energy can greatly enhance the selective dissolution of the surface of the spodumene ore during the flotation pretreatment process, thereby increasing the surface property difference and the floatability difference between the spodumene ore and the gangue mineral; moreover, compared with the traditional mechanical stirring used in the flotation pretreatment of spodumene ore, the pretreatment by ultrasonic treatment can reduce the stirring speed and pretreatment time, shorten the flotation pretreatment process, and also reduce the dosage of the adjusting agent I, thereby reducing the pH of the flotation concentrate and tailings slurry of the spodumene ore, thereby significantly improving the dehydration performance of the flotation tailings and concentrate products.

[0057] According to the present invention, preferably, the amount of the adjusting agent I is 400-1000g per ton of the ore, specifically 400g, 600g, 800g, 1000g, or any value between the above two values. The inventors found that under this preferred embodiment, compared with the traditional mechanical stirring pretreatment, only the above amount of adjusting agent I can achieve a better pretreatment effect of spodumene ore flotation, and can reduce the amount of adjusting agent I, reduce the pH of spodumene ore flotation concentrate and tailings slurry, and thus significantly improve the dehydration performance of flotation tailings and concentrate products.

[0058] According to the present invention, in order to further improve the pretreatment effect of spodumene ore flotation, preferably, the adjusting agent I is sodium hydroxide and / or sodium carbonate, and the adjusting agent I can be sodium hydroxide, sodium carbonate, or a mixture of sodium hydroxide and sodium carbonate. Further preferably, the adjusting agent I is sodium hydroxide.

[0059] According to the present invention, in order to further improve the adsorption effect and flotation efficiency of the slurry collection composition on spodumene ore, preferably, the mass fraction of the ore in the slurry II is 20-30%.

[0060] In the present invention, the slurry II can also be subjected to sedimentation and desliming. Exemplarily, the sedimentation and desliming process includes: sedimenting the slurry after ultrasonic treatment for 1-3 minutes, removing the upper suspension, and then mixing with water to obtain slurry II. Sedimentation can be carried out by static stratification. Depending on the content of muddy minerals in the spodumene ore, the mass fraction of the sludge removed in the upper suspension accounts for 5-15% of the ore (dry weight).

[0061] According to the present invention, preferably, in step (3), the slurry adjustment and collection composition contains a slurry adjustment collector and an activator. The inventors have found that under this preferred embodiment, the adsorption effect and flotation efficiency of the slurry adjustment and collection composition on spodumene ore can be further improved through the coordination between the slurry adjustment collector and the activator.

[0062] According to the present invention, preferably, the slurry adjustment collector contains vegetable oleic acid and sodium hydroxide, and the activator is calcium chloride. The inventors have found that under this preferred embodiment, the adsorption effect and flotation efficiency of the slurry adjustment collector composition on spodumene ore can be further improved through the synergistic effect between vegetable oleic acid, sodium hydroxide and calcium chloride.

[0063] In the present invention, vegetable oleic acid refers to a yellowish transparent oily liquid obtained by a series of chemical process using plants as the main raw materials, and its main components are monounsaturated fatty acids (oleic acid, erucic acid), dioleic acid (mainly linoleic acid) and polyoleic acid. Exemplarily, the iodine value of the vegetable oleic acid is 80-140, for example, soybean oleic acid. Generally, the higher the iodine value of the vegetable oleic acid, the higher its linoleic acid content.

[0064] According to the present invention, in order to further improve the adsorption effect and flotation efficiency of the slurry adjustment and collection composition on spodumene ore, preferably, in the slurry adjustment and collection agent, the weight ratio of the vegetable oleic acid to the sodium hydroxide is 5-8:1, specifically 5:1, 6:1, 7:1, 8:1, or any value between the foregoing two values.

[0065] According to the present invention, preferably, the amount of the activator is 10-300g, specifically 10g, 100g, 200g, 300g, or any value between the two values, relative to each ton of the ore; the amount of the slurry collector is 500-1400g, specifically 500g, 800g, 1000g, 1200g, 1400g, or any value between the two values. The inventors found that under this preferred embodiment, the adsorption effect and flotation efficiency of the slurry collector composition on spodumene ore are further improved through the coordination between the specific amount of slurry collector and the activator.

[0066] In the present invention, the slurry adjustment process can be to directly add the collector and the activator to the slurry II for slurry adjustment; the slurry adjustment process can also be to first add the activator to the slurry II for the first slurry adjustment, and then add the collector for the second slurry adjustment. In order to further improve the adsorption effect and flotation efficiency of the slurry adjustment and collector composition on spodumene ore, preferably, the slurry adjustment process includes: adding the activator to the slurry II for slurry adjustment I, and then adding the slurry adjustment collector for slurry adjustment II.

[0067] The slurry adjustment I and slurry adjustment II involved in the present invention need to stir the corresponding slurry, and those skilled in the art can select appropriate stirring speed and stirring time according to the actual operation conditions. Preferably, the conditions of the slurry adjustment I and the slurry adjustment II each independently include at least: a speed of 1500-2500rpm, specifically 1500rpm, 2000rpm, 2500rpm, or any value between the above two values; a time of 4-6min, specifically 4min, 5min, 6min, or any value between the above two values.

[0068] According to the present invention, in order to further improve the adsorption effect and flotation efficiency of the slurry collection composition on spodumene ore, preferably, the mass fraction of the ore in the slurry III is 20-30%.

[0069] According to the present invention, preferably, in step (4), the flotation process comprises:

[0070] S1, roughing the slurry III to obtain spodumene concentrate I and tailings product I;

[0071] S2, the spodumene concentrate I and the additive are mixed and beneficiated at least twice to obtain the spodumene concentrate, and the tailings product I and the scavenging collector are mixed and beneficiated at least once to obtain the tailings product; the additive is a regulator II and / or a beneficiation collector. The inventors have found that under this preferred embodiment, the flotation efficiency of the spodumene ore can be improved, and the recovery efficiency of the spodumene ore and the grade of Li2O in the spodumene can be effectively improved.

[0072] According to the present invention, the roughing in step S1 can adopt the flotation method commonly used in the art. Preferably, in step S1, the roughing is aeration flotation, and the roughing time is 2-5 minutes, specifically 2 minutes, 3 minutes, 4 minutes, 5 minutes, or any value between the above two values.

[0073] According to the present invention, preferably, in step S2, the concentrating is performed twice, and in each concentrating, the amount of the additive used per ton of the ore is 100-500 g, specifically 100 g, 200 g, 300 g, 400 g, 500 g, or any value between the above two values.

[0074] In the present invention, the additive is a regulator II and / or a fine collector, wherein the regulator II is sodium hydroxide and / or sodium carbonate.

[0075] The above substances can all be obtained commercially.

[0076] In the present invention, before each concentration, the additive needs to be allowed to act on the slurry for 3-8 minutes, preferably 5 minutes.

[0077] According to the present invention, preferably, the scavenging is performed once, and in the scavenging, the amount of the scavenging collector used per ton of the ore is 100-300 g, specifically 100 g, 200 g, 300 g, or any value between the above two values.

[0078] In the present invention, before scavenging, the scavenging collector needs to act with the slurry for 3-8 minutes, preferably 5 minutes.

[0079] In the present invention, the adjusting agent II and the adjusting agent I may be the same or different. Preferably, the adjusting agent II is sodium carbonate; the selecting collector and the scavenging collector may be the commonly used collectors in the art, and the selecting collector and the scavenging collector may be the same or different. Preferably, the selecting collector and the scavenging collector are the same as the above-mentioned slurry adjusting collector.

[0080] In the present invention, the concentration and scavenging can adopt the flotation method commonly used in the art. Preferably, the concentration and scavenging are both aeration flotation, and the time of aeration flotation is 2-5 minutes, specifically 2 minutes, 3 minutes, 4 minutes, 5 minutes, or any value between the above two values.

[0081] As a particularly preferred embodiment of the present invention, the spodumene ore flotation method comprises the following steps:

[0082] (1) After crushing the spodumene ore, ore particles with a particle size of less than or equal to 2 mm are screened out as ore material, the ore material is mixed with water and ground to a fineness of -0.074 mm accounting for 65-80 wt%, and then mixed with water so that the mass fraction of the ore material is 60-70% to obtain slurry I;

[0083] (2) After mixing the slurry I and the adjusting agent I, ultrasonic treatment is performed for 5-20 min under the conditions of an ultrasonic frequency of 45-100 kHz, an ultrasonic power of 1500-25000 W, and a rotation speed of 500-6000 rpm to obtain slurry II; the amount of the adjusting agent I is 400-1000 g per ton of the ore; the adjusting agent I is sodium hydroxide and / or sodium carbonate; the mass fraction of the ore in the slurry II is 20-30%;

[0084] (3) adding an activator to the slurry II to perform slurry adjustment I, and then adding a slurry adjustment collector to perform slurry adjustment II to obtain slurry III; the slurry adjustment collector contains vegetable oleic acid and sodium hydroxide, and the activator is calcium chloride; in the slurry adjustment collector, the weight ratio of the vegetable oleic acid to the sodium hydroxide is 5-8:1; the amount of the activator is 10-300g per ton of the ore, and the amount of the slurry adjustment collector is 500-1400g; the mass fraction of the ore in the slurry III is 20-30%; the conditions of the slurry adjustment I and the slurry adjustment II each independently include at least: a rotation speed of 1500-2500rpm and a time of 4-6min;

[0085] (4) The pulp III is roughly selected for 2-4 minutes to obtain spodumene concentrate I and tailings product I; the spodumene concentrate I is mixed with an additive and then selected twice to obtain spodumene concentrate, wherein the additive is an adjusting agent II and / or a selecting collector, and the selecting time for each time is 2-5 minutes. In each time of the selecting, the amount of the additive per ton of the ore is 100-500 g; the tailings product I is mixed with a scavenging collector and then scavenged once to obtain a tailings product, and the scavenging time is 2-5 minutes. In the scavenging, the amount of the scavenging collector per ton of the ore is 100-300 g; the selecting and scavenging are both aeration flotation.

[0086] In the above particularly preferred embodiment, by performing ultrasonic treatment after mixing the slurry I and the adjusting agent I, the efficiency of the flotation pretreatment can be improved, the flotation process flow can be greatly shortened, and the amount of adjusting agent I used in the flotation pretreatment process can be reduced, thereby improving the dehydration performance of the spodumene ore flotation concentrate and tailings products, and realizing the recycling of spodumene ore dressing wastewater.

[0087] The present invention will be described in detail below through examples.

[0088] In the following examples, the spodumene ore was taken from the Jiajika spodumene mining area in Ganzi, Sichuan, which is a muddy spodumene ore and a difficult-to-select spodumene ore; sodium hydroxide was purchased from Sinopharm Group and was analytically pure; vegetable oleic acid was purchased from Tianmen Chengxin Chemical Co., Ltd. and had an iodine value of 120-140; calcium chloride and sodium carbonate were purchased from Aladdin Chemical Reagent Company.

[0089] In Examples 1 to 6 and the comparative example, the mineral composition of the selected spodumene ore is shown in Table 1, and the chemical composition of the spodumene ore is shown in Table 2.

[0090] Table 1

[0091] Element Spodumene quartz muscovite Biotite content(%) 18.56 23.45 14.17 10.09 Element Chlorite Sodium feldspar Potassium feldspar other content(%) 0.86 27.34 2.54 3.02

[0092] Table 2

[0093] Element <![CDATA[Al2O3]]> <![CDATA[SiO2]]> <![CDATA[Fe2O3]]> FeO CaO content(%) 16.00 71.89 0.42 2.53 0.28 Element MgO <![CDATA[K2O]]> <![CDATA[Na2O]]> S C content(%) 0.083 0.19 3.80 0.0081 0.06 Element BeO <![CDATA[Li2O]]> <![CDATA[Nb2O5]]> <![CDATA[Ta2O5]]> Burn reduction content(%) 0.042 1.54 0.19 0.0028 0.43

[0094] Example 1

[0095] (1) The spodumene ore is put into a crusher for crushing, and the ore particles with a particle size less than or equal to 2 mm are screened as ore material, and are packed into bags for standby use;

[0096] (2) 350 g of the above-mentioned ore was put into a ball mill, 210 mL of water and 0.385 g of sodium carbonate solid were added, and the mixture was ground by the ball mill for 4 min to obtain a slurry I with a grinding product particle size of -0.074 mm accounting for 70%;

[0097] (3) Pour the above slurry I into an ultrasonic stirring tank, add 0.175 g of sodium hydroxide solid, and stir ultrasonically for 8 minutes, wherein the ultrasonic power is 2000 W, the stirring speed is 500 rpm, and the ultrasonic frequency is 45 kHz, to obtain slurry II;

[0098] (4) adding calcium chloride (the amount of calcium chloride is 200 g / t spodumene ore) to the slurry II obtained in step (3), adjusting the stirring speed of the flotation machine to 2000 rpm, stirring for 5 min, adding a slurry mixing collector (the amount of the slurry mixing collector is 1300 g / t spodumene ore, and the weight ratio of vegetable oleic acid to sodium hydroxide in the slurry mixing collector is 7:1), and continuing to stir for 5 min at a speed of 2000 rpm to obtain slurry III;

[0099] (5) subjecting the ore pulp III obtained in step (4) to aeration flotation for 5 min to obtain a spodumene coarse concentrate and tailings I;

[0100] (6) after stirring tailings I for 5 min, adding a scavenging collector (the amount of the scavenging collector is 200 g / t spodumene ore, and in the scavenging collector, the weight ratio of vegetable oleic acid to sodium hydroxide is 7:1), stirring for 5 min and then aerating flotation for 3 min to obtain a scavenging concentrate and tailings II;

[0101] (7) adding sodium carbonate (the amount of sodium carbonate used is 300 g / t spodumene ore) to the coarse concentrate in a 0.5 L flotation machine, stirring for 5 min, and then aerating flotation for 2 min 30 s to obtain the middling ore I and the concentrate I;

[0102] (8) adding sodium carbonate (the amount of sodium carbonate is 150 g / t spodumene ore) to concentrate I in a 0.5 L flotation machine, stirring for 5 min, and then aerating flotation for 2 min 30 s to obtain middling II and concentrate II;

[0103] (9) Repeat steps (1) to (8) six times, adding the middlings and scavenged concentrates produced each time to the next flotation until the mass and metal content of the concentrate II and tailings II reach equilibrium.

[0104] The process flow chart of the spodumene ore flotation method provided in Example 1 is as follows Figure 2 shown.

[0105] Example 2

[0106] Spodumene ore flotation was carried out according to the method of Example 1, except that the stirring speed in step (3) was replaced with 2000 rpm.

[0107] Example 3

[0108] Spodumene ore flotation was carried out according to the method of Example 1, except that the amount of solid sodium hydroxide in step (3) was replaced by 0.35 g.

[0109] Example 4

[0110] Spodumene ore flotation was carried out according to the method of Example 1, except that the ultrasonic stirring time in step (3) was replaced with 3 minutes.

[0111] Example 5

[0112] Spodumene ore flotation was carried out according to the method of Example 1, except that the ultrasonic power in step (3) was replaced with 1000 W.

[0113] Example 6

[0114] Spodumene ore flotation was carried out according to the method of Example 1, except that the amount of solid sodium hydroxide in step (3) was replaced by 0.07 g.

[0115] Comparative Example

[0116] The spodumene ore flotation was carried out according to the method of Example 1, except that step (3) was replaced by conventional mechanical stirring. The specific operation was as follows:

[0117] (3) Pour the above slurry I into an ultrasonic stirring tank, add 0.35 g of sodium hydroxide solid, and stir mechanically for 25 min at a stirring speed of 200 rpm to obtain slurry II.

[0118] Test Case

[0119] The spodumene concentrate and tailings products obtained in Examples 1 to 6 and the comparative example were analyzed, and the specific test results are shown in Table 3.

[0120] Table 3

[0121]

[0122] It can be seen from the results in Table 3 that, compared with the comparative example, Examples 1 to 6 adopt the spodumene ore flotation method provided by the present invention, and by ultrasonically treating the slurry I, the flotation pretreatment efficiency is improved, the flotation pretreatment time is shortened, the stirring speed required for the pretreatment is reduced, and the amount of NaOH used in the pretreatment process is greatly reduced; a spodumene concentrate with a higher Li2O grade and a Li2O recovery rate is obtained by one coarse, two fine and one sweep, and the pH of the tailings is reduced, thereby significantly improving the dehydration performance of the flotation tailings and the concentrate products, which is conducive to the disposal and recycling of spodumene ore dressing wastewater.

[0123] The preferred embodiments of the present invention are described in detail above, but the present invention is not limited thereto. Within the technical concept of the present invention, the technical solution of the present invention can be subjected to a variety of simple modifications, including the combination of various technical features in any other suitable manner, and these simple modifications and combinations should also be regarded as the contents disclosed by the present invention and belong to the protection scope of the present invention.

Claims

1. A spodumene ore flotation method, characterized in that: The following steps are involved: (1) mixing a mineral material with water and grinding the mixture to obtain a slurry I; (2) mixing the slurry I and the adjusting agent I and performing ultrasonic treatment to obtain slurry II; (3) mixing the slurry II with the slurry collecting composition to obtain slurry III; (4) flotation the slurry III to obtain spodumene concentrate and tailings products.

2. The spodumene ore flotation method according to claim 1, wherein In step (1), the preparation process of the ore comprises: crushing the spodumene ore, and screening out ore particles with a particle size less than or equal to 2 mm; Preferably, the grinding process comprises: grinding the mineral material to a fineness of -0.074 mm accounting for 65-80 wt%; Preferably, the mass fraction of the mineral material in the slurry I is 60-70%.

3. The spodumene ore flotation method according to claim 2, wherein: Before the grinding, sodium carbonate is added to the ore; Preferably, the amount of sodium carbonate used is 800-1500 g per ton of the mineral material.

4. The spodumene ore flotation method according to claim 1, wherein In step (2), the conditions of the ultrasonic treatment include at least: an ultrasonic frequency of 45-100 kHz, an ultrasonic power of 1500-2500 W, a rotation speed of 500-6000 rpm, and a time of 5-20 min.

5. The spodumene ore flotation method according to claim 4, wherein: The amount of the adjusting agent I is 400-1000 g per ton of the ore; Preferably, the adjusting agent I is sodium hydroxide and / or sodium carbonate; Preferably, the mass fraction of the mineral material in the slurry II is 20-30%.

6. The spodumene ore flotation method according to any one of claims 1 to 5, characterized in that: In step (3), the slurry adjustment and collection composition contains a slurry adjustment and collection agent and an activator; Preferably, the slurry collector contains vegetable oleic acid and sodium hydroxide, and the activator is calcium chloride; Preferably, in the slurry adjustment collector, the weight ratio of the vegetable oleic acid to the sodium hydroxide is 5-8:1; Preferably, with respect to each ton of the mineral material, the dosage of the activator is 10-300 g, and the dosage of the slurry adjustment collector is 500-1400 g.

7. The spodumene ore flotation method according to claim 6, characterized in that: The slurry adjustment process includes: adding the activator to the ore slurry II to perform slurry adjustment I, and then adding the slurry adjustment collector to perform slurry adjustment II; Preferably, the conditions of the slurry adjustment I and the slurry adjustment II each independently include at least: a rotation speed of 1500-2500 rpm and a time of 4-6 min; Preferably, the mass fraction of the mineral material in the slurry III is 20-30%.

8. The spodumene ore flotation method according to any one of claims 1 to 5, characterized in that: In step (4), the flotation process includes: S1, roughing the slurry III to obtain spodumene concentrate I and tailings product I; S2. The spodumene concentrate I and the additive are mixed and beneficiated at least twice to obtain the spodumene concentrate, and the tailings product I and the scavenging collector are mixed and beneficiated at least once to obtain the tailings product; the additive is an adjusting agent II and / or a beneficiating collector.

9. The spodumene ore flotation method according to claim 8, characterized in that: In step S1, the roughing is aeration flotation, and the roughing time is 2-5 minutes.

10. The spodumene ore flotation method according to claim 9, characterized in that: In step S2, the cleaning is performed twice, and in each cleaning, the amount of the additive is 100-500 g per ton of the ore; Preferably, the scavenging is performed once, and in the scavenging, the amount of the scavenging collector used is 100-300 g per ton of the ore; Preferably, both the concentration and the scavenging are aeration flotation, and the time of the aeration flotation is 2-5 minutes.

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