Process method for extracting high-white feldspar from lithium-containing porcelain clay ore

Abstract

The invention relates to a process method for extracting high-white feldspar from lithium-containing china clay ore. The process method comprises the following steps: S1, grinding the lithium-containing china clay ore, grading, checking and screening by using a high-frequency screen, combining undersize materials with overflow of a hydrocyclone, feeding into a weak magnetic separator for deironing, and continuously feeding oversize materials into a ball mill for grinding; s2, performing first-stage high-gradient strong magnetic separation on the material obtained after iron removal by the weak magnetic machine in the step S1; s3, controlling the non-magnetic substances obtained in the step S2 to enter second-stage high-gradient strong magnetic separation; s4, the non-magnetic substances obtained in the step S3 enter a hydrocyclone for desliming and then enter a flotation link; s5, roughing operation is carried out; s6, roughing tailings obtained after roughing operation in the step S5 are continuously fed into scavenging operation; and S7, the first scavenging tailings obtained in the step S6 are continuously fed into the second scavenging operation, and the obtained second scavenging tailings are the high-white feldspar. According to the method, high-white feldspar with high white and low iron is obtained, and the recovery rate of lepidolite is increased.

Description

Technical Field

[0001] The invention relates to the technical field of ore dressing, in particular to a process for extracting high-white feldspar from lithium-containing china clay ore. Background Art

[0002] Lepidolite is a widely distributed mica mineral. Lepidolite deposits found in the earth's crust often exist in the form of associated minerals of other rare metals. Among them, the niobium-tantalum associated lepidolite deposit in Yichun, Jiangxi, China is the largest lepidolite mine in Asia, accounting for more than 30% of the country's lithium resource reserves, and has important strategic value. Lithium extraction from lepidolite concentrate is one of the main sources of lithium. Especially with the rapid increase in the use of lithium-ion batteries in electronic equipment and electric vehicles in new energy vehicles, electronic products and energy storage systems, the demand for lithium is gradually increasing. At the same time, the output of lepidolite tailings will gradually increase. With the rapid development of lepidolite smelting lithium carbonate, there will be tailings products in the extraction process of lepidolite. Due to the rapid growth of volume, the output of tailings has increased, but the amount that can be digested and used in the market has not kept up. The reason is that ordinary feldspar is one of the important raw materials in the ceramic industry, and its whiteness and iron content will affect and restrict its use and proportion.

[0003] Among the feldspar products, high white feldspar has obvious advantages such as uniform particle size, high whiteness, and low iron content, and has greater advantages in product application. However, high white feldspar is often more difficult to achieve and has a low output rate. In order to solve the problem of easing the sales of ordinary feldspar without affecting the production of ore dressing plants and smelters, new processes and methods are needed to extract high white feldspar from lithium-containing porcelain clay ores. Summary of the invention

[0004] In view of the low output efficiency of high-lepidolite in the above-mentioned prior art, the applicant provides a reasonable and effective process for extracting high-lepidolite from lithium-containing porcelain clay ore, which achieves the product of high-lepidolite with high whiteness and low iron content and improves the recovery rate of lithium mica.

[0005] The technical solution adopted by the present invention is as follows: A process for extracting high-white feldspar from lithium-containing porcelain clay ore, comprising the following steps: Step S1, grinding the lithium-containing porcelain clay ore and then entering the spiral classifier for classification, returning the sand to the ball mill for grinding, and the overflow entering the hydrocyclone for classification, the bottom flow of the hydrocyclone enters the high-frequency screen for inspection and screening, the underscreen material is combined with the overflow of the hydrocyclone, and enters the weak magnetic machine for iron removal, and the overscreen material continues to enter the ball mill for grinding; Step S2, the material obtained after the weak magnetic machine in step S1 is de-ironized is then sent to a high gradient strong magnetic separation, the feed concentration is controlled at 25-30%, the magnetic field strength is controlled at 1.5T, and the rotating ring frequency is controlled at 35 Hz. After a high gradient magnetic separation, magnetic and non-magnetic materials are obtained; Step S3, controlling the non-magnetic material obtained in step S2 to enter the second stage of high gradient strong magnetic separation, the feed concentration is controlled to be 25-30%, the magnetic field strength is 1.7T, and the rotating ring frequency is controlled to be 35 Hz. After the second stage of high gradient magnetic separation, magnetic material and non-magnetic material are obtained, and the obtained magnetic material is combined with the magnetic material in step S2; Step S4, the non-magnetic material obtained in step S3 is added with water to maintain the pulp concentration at 20-25%, and the pulp enters the 250 hydrocyclone for desludging, and the pressure of the hydrocyclone is controlled to be 0.12MPa; the overflow of the hydrocyclone enters the deep cone sedimentation concentration, and the bottom flow of the hydrocyclone enters the flotation stage; Step S5, feeding the underflow slurry of the hydrocyclone in step S4 into a mixing barrel for slurry mixing, controlling the slurry concentration at 38-42%, adding a collector and an inhibitor, and then entering a roughing operation, wherein the roughing time is 4-6 minutes, the flotation machine speed is 1850-1950 rpm, the inflation volume is 0.4-0.6m³ / min, the flotation temperature is controlled at 18-25°C, the foam product is a lithium mica rough concentrate product, the lithium mica rough concentrate enters the first selection, and the roughing tailings product; Step S6, the roughing tailings of the roughing operation of step S5 are continuously fed into the scavenging operation, the scavenging time is 4-6 minutes, the foam product is the scavenging concentrate product, and it is returned to the mixing barrel of step S5 for further roughing, and the scavenging first obtains the scavenging first tailings; Step S7, the tailings of the scavenging operation of step S6 are continuously fed into the scavenging operation of step S6, and the foam concentrate is returned to the scavenging operation of step S6, and the tailings of step S6 are high white feldspar, which is dehydrated to obtain high white feldspar with a moisture content of 12%.

[0006] As a further improvement of the above technical solution: Further comprising: step S1 uses a 0.6×0.6mm five-layer high-frequency screen, the feed concentration is controlled within the range of 35%-40%, the vibration frequency and amplitude are controlled within the range of 1080-1500 times / minute and 3-5mm respectively, ensuring that the content under the sieve -60 mesh is not less than 85%.

[0007] The method further comprises: combining the magnetic material obtained in step S3 and the magnetic material obtained in step S2 and then entering into a fine particle flotation process; entering into a fine particle flotation process also the selected lepidolite obtained in step S5, and finally obtaining a lepidolite product through the fine particle flotation process.

[0008] Further including: Step S8, the magnetic material obtained in step S3 and the magnetic material in step S2 are combined and then enter the hydrocyclone for classification, the bottom flow of the hydrocyclone enters the five-layer high-frequency screen for inspection and screening, and the overflow enters the deep cone for sedimentation; Step S9, the material on the five-layer high-frequency screen in step S8 is returned to the ball mill for grinding, the material under the screen enters the hydrocyclone, the overflow of the hydrocyclone is combined with the overflow of the hydrocyclone in step S8 and enters the deep cone, and the bottom flow enters the mixing barrel of the flotation; Step S10, adding a collector and an inhibitor to the flotation stirring barrel of step S9, and then entering the roughing operation, wherein the roughing time is 4-6 minutes, the flotation machine speed is 1850-1950 rpm, the inflation volume is 0.4-0.6m³ / min, the flotation temperature is controlled at 18-25°C, the foam product is a lithium mica rough concentrate product, and a roughing tailing product is obtained. The lithium mica rough concentrate enters the concentration to obtain a lithium mica product, and a concentrated ore is obtained; Step S11, feeding the roughing tailings of the roughing operation of step S10 into the scavenging operation, the scavenging time is 4-6 minutes, and the foam product is the scavenging concentrate product, which is returned to the ball mill of step S1 for grinding, and the scavenging tailings are obtained by scavenging, and are returned to the roughing operation together with the concentrated middlings of step S10; In step S12, the selected lepidolite obtained from the lepidolite selection step S5 is also put into the flotation stirring barrel of step S10, and finally the lepidolite product is obtained through the flotation process.

[0009] Further including: Step S13, the scavenged tailings obtained in step S7 are distributed through a slurry distributor, one path enters a belt filter to obtain high white feldspar, and the other path is combined with the overflow of the hydrocyclone in step S4 into a deep cone sedimentation and concentration product, and then enters the hydrocyclone together; Step S14, the underflow of the hydrocyclone in step S13 enters the belt filter to obtain ceramic feldspar, and the overflow of the hydrocyclone enters the deep cone sedimentation.

[0010] Further including: Step S15, the product after deep cone sedimentation in step S8 enters the gravity separation process of the Buliu shaking table to extract tantalum minerals, and then enters the deep cone in step S14 after extracting iron concentrate through two-stage flat magnetic separation, and is combined with the overflow of the hydrocyclone in step S14 and then sedimented in the deep cone together. The product after sedimentation enters the filter press to obtain ultrafine feldspar.

[0011] The beneficial effects of the present invention are as follows: The present invention adopts a process combining multi-stage combined screening with flotation and magnetic separation to make innovative improvements in the process flow. Through spiral classifier, hydrocyclone and high-frequency screen classification, good conditions are created for flotation and magnetic separation. While flotation extracts lithium mica, the iron content of feldspar is also reduced. One stage of weak magnetic and two stages of strong magnetic separation remove mechanical iron and secondary iron, and finally obtain high-quality high-white feldspar. The innovation of the process route makes the quality characteristics of the high-white feldspar output better. The final low-iron photovoltaic feldspar product of the present invention contains less than 0.06% Fe2O3 and the whiteness can reach more than 70.

[0012] The process method of the present invention adopts multi-stage classification, step-type magnetic separation, separate flotation and other joint process innovations to reduce energy consumption, obtain high-quality products, and achieve high-white and low-iron high-white feldspar products. At the same time, the present invention adopts coarse-grained flotation concentrate to fine-grained flotation, and fine-grained flotation tailings return and regrinding and other process improvements, which significantly improves the recovery rate of lithium mica and has a more effective technical effect of extracting lithium mica. The present invention adopts a five-layer high-frequency screen with a hydrocyclone and a spiral classifier to make good pre-preparation for flotation and extraction of high-white feldspar. The present invention optimizes the screening parameters to ensure that the content of -60 mesh under the screen is not less than 85%, and cooperates with the hydrocyclone to improve the particle size distribution entering the magnetic separation, thereby achieving an improvement in the effect of the process. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 The present invention is a schematic diagram of a process flow diagram of an embodiment of the present invention.

[0014] Figure 2 The figure is a schematic diagram of the process flow for extracting ceramic feldspar and ultrafine feldspar according to the present invention. DETAILED DESCRIPTION

[0015] The preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0016] Reference Figure 1 As shown, the present invention provides a process for extracting high white feldspar from lithium-containing porcelain clay ore, and the specific technical scheme is as follows: Step S1, grinding the lithium-containing porcelain clay ore and then entering the spiral classifier for classification, returning the sand to the ball mill for grinding, and the overflow entering the hydrocyclone for classification. The bottom flow of the hydrocyclone enters the high-frequency screen for inspection and screening. This step S1 uses a five-layer high-frequency screen of 0.6×0.6mm, the feed concentration is controlled within the range of 35%-40%, the vibration frequency and amplitude are controlled at 1080-1500 times / minute and 3-5mm respectively, ensuring that the content of -60 mesh under the screen is not less than 85%, the underscreen material is combined with the overflow of the hydrocyclone, enters the weak magnetic machine for iron removal, and the overscreen material continues to enter the ball mill for grinding.

[0017] Step S2, the material obtained after the weak magnetic machine in step S1 is de-ironized is then sent to a high gradient strong magnetic separation, the feed concentration is controlled at 25-30%, the magnetic field strength is controlled at 1.5T, and the rotating ring frequency is controlled at 35 Hz. After a high gradient magnetic separation, magnetic and non-magnetic materials are obtained.

[0018] Step S3, control the non-magnetic material obtained in step S2 to enter the second stage of high gradient strong magnetic separation, the feed concentration is controlled to be 25-30%, the magnetic field strength is 1.7T, and the rotating ring frequency is controlled to be 35 Hz. After the second stage of high gradient magnetic separation, magnetic and non-magnetic materials are obtained, and the obtained magnetic materials are combined with the magnetic materials in step S2.

[0019] Step S4, the non-magnetic material obtained in step S3 is added with water to maintain the pulp concentration at 20-25%, and the pulp enters the 250 hydrocyclone for desludging, and the pressure of the hydrocyclone is controlled to 0.12MPa; the overflow of the hydrocyclone enters the deep cone sedimentation concentration, and the bottom flow of the hydrocyclone enters the flotation stage.

[0020] Step S5, feeding the bottom flow slurry of the hydrocyclone in step S4 into the mixing barrel for slurry mixing, controlling the slurry concentration at 38-42%, adding collectors and inhibitors, and then entering the roughing operation, wherein the roughing time is 4-6 minutes, the flotation machine speed is 1850-1950 rpm, the inflation volume is 0.4-0.6m³ / min, the flotation temperature is controlled at 18-25°C, the foam product is the lithium mica rough concentrate product, the lithium mica rough concentrate enters the first selection, and the roughing tailings product.

[0021] Step S6, the roughing tailings of step S5 are continuously fed into the scavenging operation, the scavenging time is 4-6 minutes, the foam product is the scavenging concentrate product, which is returned to the mixing barrel of step S5 for further roughing, and the scavenging tailings are obtained.

[0022] Step S7, the tailings of the first scavenging operation of step S6 are continuously fed into the second scavenging operation, and the foam concentrate is returned to the first scavenging operation, and the tailings of the second scavenging operation obtained are high white feldspar, and after dehydration, high white feldspar with a moisture content of 12% is obtained. The final low iron feldspar product contains less than 0.06% Fe2O3 and has a whiteness of more than 70.

[0023] Step S8, the magnetic material obtained in step S3 and the magnetic material in step S2 are combined and then enter the hydrocyclone for classification, the bottom flow of the hydrocyclone enters the five-layer high-frequency screen for inspection and screening, and the overflow enters the deep cone for sedimentation.

[0024] In step S9, the material on the five-layer high-frequency screen in step S8 is returned to the ball mill in step S1 for grinding, and the material under the screen enters the hydrocyclone. The overflow of the hydrocyclone is combined with the overflow of the hydrocyclone in step S8 and enters the deep cone together, and the bottom flow enters the mixing barrel of the flotation.

[0025] Step S10, adding collector and inhibitor to the flotation stirring barrel of step S9, and then entering the roughing operation, wherein the roughing time is 4-6 minutes, the flotation machine speed is 1850-1950 rpm, the inflation volume is 0.4-0.6m³ / min, the flotation temperature is controlled at 18-25°C, the foam product is a lithium mica rough concentrate product, and a roughing tailings product is obtained. The lithium mica rough concentrate enters the concentration to obtain a foam product as a lithium mica product, and a concentrated ore is obtained.

[0026] Step S11, feed the roughing tailings of the roughing operation of step S10 into the scavenging operation, the scavenging time is 4-6 minutes, the foam product is the scavenging concentrate product, it is returned to the ball mill of step S1 for grinding, scavenging to obtain scavenging tailings, and it is returned to the roughing together with the concentrated middling ore of step S10.

[0027] In step S12, the selected lepidolite obtained from the lepidolite selection step S5 is also put into the flotation stirring barrel of step S10, and finally the lepidolite product is obtained through the flotation process.

[0028] Reference Figure 2 As shown, the present invention further includes a process step for extracting ceramic feldspar and ultrafine feldspar, specifically including the following steps: Step S13, the scavenging tailings obtained in step S7 are distributed through a slurry distributor, one path enters the belt filter to obtain high white feldspar, and the other path is combined with the overflow of the hydrocyclone in step S4 and the product after entering the deep cone sedimentation concentration, and then enters the hydrocyclone together.

[0029] Step S14, the underflow of the hydrocyclone in step S13 enters the belt filter to obtain ceramic feldspar, and the overflow of the hydrocyclone enters the deep cone sedimentation.

[0030] Step S15, the product after deep cone sedimentation in step S8 enters the gravity separation process of the Buliu shaking table to extract tantalum minerals, and then extracts the iron concentrate through two-stage flat magnetic separation to obtain non-magnetic materials. The non-magnetic materials enter the deep cone in step S14, and are combined with the overflow of the hydrocyclone in step S14 and then sedimented in the deep cone. The product after sedimentation enters the filter press to obtain ultrafine feldspar.

[0031] Through the above-mentioned process steps of extracting ceramic feldspar and ultrafine feldspar, a variety of feldspar products with different characteristics and grades can be produced simultaneously, with rich varieties, high production efficiency and stronger market supply capacity.

[0032] In order to verify the effect of the present invention, a comparative test of equal amounts was conducted, and the comparative groups were set as follows: Comparative Example 1 adopts desludging and flotation after grinding and classification, and the flotation tailings are subjected to strong magnetic separation to obtain feldspar products and lithium mica products, wherein the grinding adopts a ball mill, the screening adopts a five-layer high-frequency vibrating screen, a five-layer high-frequency screen of 0.6×0.6mm is used, the feed concentration is controlled within the range of 35%-40%, the vibration frequency and amplitude are controlled at 1080-1500 times / minute and 3-5mm respectively, the desludging adopts a hydrocyclone, and the flotation adopts a one-rough and two-sweep closed-circuit process, including the addition of collectors and inhibitors, the roughing time is 4-6 minutes, the flotation machine speed is 1850-1950 rpm, the inflation volume is 0.4-0.6m³ / minute, and the flotation temperature is controlled at 18-25℃, etc. The strong magnetic separation adopts a magnetic field strength of 1.7T and a ring frequency of 35 Hz.

[0033] The feldspar products obtained in the two groups were measured and recorded, and the test results of comparative example 1 and the embodiment of the present invention are shown in Table 1. The lithium mica products and tailings obtained in the two groups were measured and counted, and the test results of comparative example 1 and the embodiment of the present invention are shown in Table 2.

[0034]

[0035] It can be seen from Table 1 above that the whiteness of the high-white feldspar product obtained in the embodiment of the present patent reaches 70, which is significantly improved compared to the whiteness of 60 in the comparative example, achieving the product characteristics of improved whiteness and reaching a higher level. The ferric oxide content is 0.06%, which is significantly lower than 0.12% in the comparative example, achieving the product characteristics of low iron.

[0036]

[0037] It can be seen from Table 2 above that the recovery rate of the lithium mica concentrate obtained in the embodiment of the present patent reaches 75.58%, the lithium oxide content in the obtained lithium mica concentrate reaches 2.55%, and the content in the tailings is as low as 0.143%, which is at a higher level. Compared with the recovery rate of 71% of the comparative example, it has been significantly improved, and the process effect of improving the recovery rate of lithium cloud has been achieved. Therefore, the method of the present invention can have a good recovery rate of lithium mica concentrate while producing high white feldspar for lithium-containing china clay ore, so that lithium resources can be efficiently recovered.

[0038] Finally, it should be noted that the above preferred embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. Although the present invention has been described in detail through the above preferred embodiments, those skilled in the art should understand that various changes can be made in form and details without departing from the scope defined by the claims of the present invention.

Claims

1. A process for extracting high-white feldspar from lithium-containing china clay ore, characterized in that: The following steps are involved: Step S1, grinding the lithium-containing porcelain clay ore and then entering the spiral classifier for classification, returning the sand to the ball mill for grinding, and the overflow entering the hydrocyclone for classification, the bottom flow of the hydrocyclone enters the high-frequency screen for inspection and screening, the underscreen material is combined with the overflow of the hydrocyclone, and enters the weak magnetic machine for iron removal, and the overscreen material continues to enter the ball mill for grinding; Step S2, the material obtained after the weak magnetic machine in step S1 is de-ironized is then sent to a high gradient strong magnetic separation, the feed concentration is controlled at 25-30%, the magnetic field strength is controlled at 1.5T, and the rotating ring frequency is controlled at 35 Hz. After a high gradient magnetic separation, magnetic and non-magnetic materials are obtained; Step S3, controlling the non-magnetic material obtained in step S2 to enter the second stage of high gradient strong magnetic separation, the feed concentration is controlled to be 25-30%, the magnetic field strength is 1.7T, and the rotating ring frequency is controlled to be 35 Hz. After the second stage of high gradient magnetic separation, magnetic material and non-magnetic material are obtained, and the obtained magnetic material is combined with the magnetic material in step S2; Step S4, the non-magnetic material obtained in step S3 is added with water to maintain the pulp concentration at 20-25%, and the pulp enters the 250 hydrocyclone for desludging, and the pressure of the hydrocyclone is controlled to be 0.12MPa; the overflow of the hydrocyclone enters the deep cone sedimentation concentration, and the bottom flow of the hydrocyclone enters the flotation stage; Step S5, feeding the underflow slurry of the hydrocyclone in step S4 into a mixing barrel for slurry mixing, controlling the slurry concentration at 38-42%, adding a collector and an inhibitor, and then entering a roughing operation, wherein the roughing time is 4-6 minutes, the flotation machine speed is 1850-1950 rpm, the inflation volume is 0.4-0.6m³ / min, the flotation temperature is controlled at 18-25°C, the foam product is a lithium mica rough concentrate product, the lithium mica rough concentrate enters the first selection, and the roughing tailings product; Step S6, the roughing tailings of the roughing operation of step S5 are continuously fed into the scavenging operation, the scavenging time is 4-6 minutes, the foam product is the scavenging concentrate product, and it is returned to the mixing barrel of step S5 for further roughing, and the scavenging first obtains the scavenging first tailings; Step S7, the tailings of the scavenging operation of step S6 are continuously fed into the scavenging operation of step S6, and the foam concentrate is returned to the scavenging operation of step S6, and the tailings of step S6 are high white feldspar, which is dehydrated to obtain high white feldspar with a moisture content of 12%.

2. The process for extracting high white feldspar from lithium-containing china clay ore according to claim 1, characterized in that: Further comprising: step S1 uses a 0.6×0.6mm five-layer high-frequency screen, the feed concentration is controlled within the range of 35%-40%, the vibration frequency and amplitude are controlled within the range of 1080-1500 times / minute and 3-5mm respectively, ensuring that the content under the sieve -60 mesh is not less than 85%.

3. The process for extracting high white feldspar from lithium-containing china clay ore according to claim 1, characterized in that: Further including: The magnetic material obtained in step S3 and the magnetic material obtained in step S2 are combined and then enter into a fine particle flotation process, and the selected lepidolite obtained in step S5 is also entered into a fine particle flotation process, and finally the lepidolite product is obtained through the fine particle flotation process.

4. The process for extracting high white feldspar from lithium-containing china clay ore according to claim 1, characterized in that: Further including: Step S8, the magnetic material obtained in step S3 and the magnetic material in step S2 are combined and then enter the hydrocyclone for classification, the bottom flow of the hydrocyclone enters the five-layer high-frequency screen for inspection and screening, and the overflow enters the deep cone for sedimentation; Step S9, the material on the five-layer high-frequency screen in step S8 is returned to the ball mill for grinding, the material under the screen enters the hydrocyclone, the overflow of the hydrocyclone is combined with the overflow of the hydrocyclone in step S8 and enters the deep cone, and the bottom flow enters the mixing barrel of the flotation; Step S10, adding a collector and an inhibitor to the flotation stirring barrel of step S9, and then entering the roughing operation, wherein the roughing time is 4-6 minutes, the flotation machine speed is 1850-1950 rpm, the inflation volume is 0.4-0.6m³ / min, the flotation temperature is controlled at 18-25°C, the foam product is a lithium mica rough concentrate product, and a roughing tailing product is obtained. The lithium mica rough concentrate enters the concentration to obtain a lithium mica product, and a concentrated ore is obtained; Step S11, feeding the roughing tailings of the roughing operation of step S10 into the scavenging operation, the scavenging time is 4-6 minutes, and the foam product is the scavenging concentrate product, which is returned to the ball mill of step S1 for grinding, and the scavenging tailings are obtained by scavenging, and are returned to the roughing operation together with the concentrated middlings of step S10; In step S12, the selected lepidolite obtained from the lepidolite selection step S5 is also put into the flotation stirring barrel of step S10, and finally the lepidolite product is obtained through the flotation process.

5. The process for extracting high white feldspar from lithium-containing china clay ore according to claim 1, characterized in that: Further including: Step S13, the scavenged tailings obtained in step S7 are distributed through a slurry distributor, one path enters a belt filter to obtain high white feldspar, and the other path is combined with the overflow of the hydrocyclone in step S4 into a deep cone sedimentation and concentration product, and then enters the hydrocyclone together; Step S14, the underflow of the hydrocyclone in step S13 enters the belt filter to obtain ceramic feldspar, and the overflow of the hydrocyclone enters the deep cone sedimentation.

6. The process for extracting high white feldspar from lithium-containing china clay ore according to claim 5, characterized in that: Further including: Step S15, the product after deep cone sedimentation in step S8 enters the gravity separation process of the Buliu shaking table to extract tantalum minerals, and then enters the deep cone in step S14 after extracting iron concentrate through two-stage flat magnetic separation, and is combined with the overflow of the hydrocyclone in step S14 and then sedimented in the deep cone together. The product after sedimentation enters the filter press to obtain ultrafine feldspar.

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