Process method for improving lepidolite recovery rate of lithium-containing porcelain clay ore

Abstract

The invention relates to a process method for extracting lepidolite from lithium-containing porcelain clay ore to recover the recovery rate. The process method comprises the steps that S1, the lithium-containing porcelain clay ore is subjected to pre-selection screening and ore grinding; s2, materials obtained after ore grinding in the step S1 and materials screened by the linear screen in the step S1 are combined and enter a spiral classifier, and returned sand enters a second ball mill to be subjected to ore grinding; s3, the ore grinding product in the step S2 is fed into the spiral classifier in the step S2 to be classified; s4, overflow of the spiral classifier in the step S3 is fed into a weak magnetic machine for iron removal; s5, feeding the magnetic substance product obtained in the step S4 into a deep cone for sedimentation and concentration; s6, the non-magnetic substances obtained in the step S4 are subjected to reselection; s7, the gravity separation tailings in the step S6 are subjected to hydrocyclone desliming; s8, underflow of the hydrocyclone in the step S7 enters a flotation stirring barrel for flotation; and S9, secondary concentrate selected in the step S8 is lepidolite ore pulp, and finally finished lepidolite is obtained. The method can improve the lepidolite recovery rate.

Description

Technical Field

[0001] The invention relates to the technical field of ore dressing, in particular to a process for improving the recovery rate of lepidolite from lithium-containing china clay ore. Background Art

[0002] Lithium and its compounds are indispensable materials for modern industry. They have important applications in batteries, ceramics, lubricants and other fields, and are important materials for the new energy vehicle industry. Although my country is rich in lithium resources, most of them are found in salt lake brine. Limited by resource endowment and geographical location and climate, its production capacity cannot meet the needs of the rapid development of my country's new energy industry. Lithium extraction from ore has become an important source of lithium products. Yichun, Jiangxi Province has the largest associated lithium mica resources in my country. The development and utilization of lithium mica resources is of great significance to ensuring the sustainable development of my country's lithium resources.

[0003] Physical mineral processing and enrichment methods for lithium mica ore include gravity separation, magnetic separation, flotation, etc. Due to the flaky nature of lithium mica, it is difficult to be ground. If the particle size of lithium mica does not meet certain requirements, the lithium mica is not completely dissociated, which will lead to a decrease in the grade of lithium mica concentrate and a generally low recovery rate. In the prior art, the general mineral processing plant generally uses grinding, classification, flotation, magnetic separation, and dehydration to obtain finished mica for lithium mica. However, the recovery rate of lithium mica lithium oxide using conventional methods is generally not high, generally 68-72%, and the concentrate grade is generally 2.3-2.5%. Therefore, from the perspective of economic value and efficient resource utilization, the recovery rate of lithium mica needs to be improved. Summary of the invention

[0004] In view of the problems of low recovery efficiency of lepidolite in the above-mentioned prior art, the applicant provides a reasonable and effective process method for improving the recovery rate of lepidolite from lithium-containing china clay ore, which can achieve the effect of improving the recovery rate of lepidolite.

[0005] The technical solution adopted by the present invention is as follows: A process for recovering lithium mica from lithium-containing china clay ore comprises the following steps: Step S1, the lithium-containing china clay ore is put into a linear screen for pre-screening, the sieve hole diameter is 1.5-2.0 mm, and the upper material is put into a ball mill for grinding; Step S2, combining the material ground in the ball mill 1 in step S1 and the material under the linear screen in step S1 into a spiral classifier, and the returned sand from the spiral classifier enters the ball mill 2 for grinding; Step S3, feeding the grinding product of the ball mill 2 in step S2 into the spiral classifier in step S2 for classification to obtain an overflow product, wherein the fineness of the overflow product is controlled to be greater than 85% of -0.2 mm; Step S4, feeding the overflow of the spiral classifier in step S3 into a weak magnetic machine for iron removal, and removing iron through two weak magnetic separations to obtain magnetic and non-magnetic materials; Step S5, feeding the magnetic product obtained in step S4 into a deep cone sedimentation concentration, and feeding the concentrated product into a plate and frame filter press, and the product becomes the final finished iron ore concentrate after filtration; Step S6, feeding the non-magnetic material obtained in step S4 into a Buliu shaking table for gravity separation, recovering tantalum-tin mixed minerals from the gravity separation concentrate, and also generating gravity separation ore and gravity separation tailings; Step S7, desludging the gravity-selected tailings obtained in step S6 by a hydrocyclone, the underflow of the hydrocyclone enters flotation, and the overflow of the hydrocyclone enters deep cone sedimentation and concentration; Step S8, the underflow of the hydrocyclone in step S7 is fed into a flotation stirring barrel, the underflow fineness of the hydrocyclone is controlled to be greater than 80% of -0.2mm, the flotation process adopts one roughing, two scavenging and two concentrating processes, the roughing concentrate is fed into the concentrating process one, the concentrating concentrate is fed into the concentrating process two, the concentrate of the concentrating process two is lithium mica slurry, the concentrating medium ore is returned to the roughing, the concentrating medium ore is returned to the concentrating process one, the roughing tailings enter the scavenging process one, the scavenging tailings are fed into the scavenging process two, to obtain the scavenging concentrate and tailings, and the scavenging concentrate is returned to the scavenging process one; Step S9: The secondary concentrate in step S8 is selected as lepidolite slurry, which is fed into a belt filter for dehydration to obtain the finished lepidolite.

[0006] As a further improvement of the above technical solution: Step S4 further includes feeding the overflow of the spiral classifier in step S3 into a first-stage weak magnetic separator, the first-stage weak magnetic separator obtains magnetic and non-magnetic materials, the obtained non-magnetic materials enter the second-stage weak magnetic separator to obtain magnetic and non-magnetic materials, the magnetic materials of the first-stage weak magnetic separator and the magnetic materials of the second-stage weak magnetic separator are combined and enter step S5 for processing, and the non-magnetic materials of the second-stage weak magnetic separator enter step S6 for processing.

[0007] Step S7 further includes: the hydrocyclone desludging process uses two-stage hydrocyclones, the material of the gravity tailings first enters the first-stage hydrocyclone, the underflow of the first-stage hydrocyclone enters the second-stage hydrocyclone, the underflow of the second-stage hydrocyclone enters the flotation process of step S8, and the overflow of the first-stage hydrocyclone and the overflow of the second-stage hydrocyclone are combined and enter the deep cone sedimentation concentration together.

[0008] The method further comprises: step S10, subjecting the tailings in step S8 to high gradient strong magnetic separation to obtain magnetic and non-magnetic materials, and combining the obtained magnetic materials with the scavenging concentrate obtained in step S8 and the gravity separation tailings obtained in step S6.

[0009] Step S11, feed the combined material in step S10 into the mill re-selection shaking table tailings middling pump pool, and then feed it into the hydrocyclone for classification, the overflow of the hydrocyclone is fed into the linear screen of step S1 for screening, and the bottom flow of the hydrocyclone is fed into the ball mill 2 of step S2 for grinding.

[0010] The method further comprises step S12, wherein the non-magnetic material in step S10 is fed into a spiral classifier for classification, and the sand returned from the spiral classifier is fed into a belt filter for dehydration to obtain the final product, glass sand.

[0011] The method further comprises step S13, wherein the overflow of the hydrocyclone in step S7 enters a deep cone sedimentation concentration product and enters a high gradient magnetic separator to obtain magnetic and non-magnetic materials, and the obtained magnetic materials are combined with the magnetic materials obtained in step S10, the scavenging concentrate obtained in step S8, and the gravity separation tailings obtained in step S6, and the operation of step S11 is performed together.

[0012] Step S14, the non-magnetic material obtained by the high gradient magnetic separator in step S13 is sent to a deep cone sedimentation concentration machine, and then sent to a filter press to obtain ultrafine feldspar.

[0013] The method further comprises step S15, combining a part of the non-magnetic material after entering the deep cone sedimentation concentration in step S14 and the overflow of the spiral classifier in step S12, and entering the belt filter together to obtain ceramic feldspar.

[0014] The beneficial effects of the present invention are as follows: The present invention adopts a process flow combining pre-screening, over-grinding prevention, magnetic separation and the like, and creates favorable conditions for flotation and magnetic separation by cooperating with a spiral classifier, a hydrocyclone and a linear screening grading, so as to better control the particle size, improve the grinding and grading treatment effects, and be beneficial to improving the final recovery rate of lithium mica.

[0015] The present invention has a process flow combining pre-screening, over-grinding prevention, magnetic separation, etc., adopts joint process innovations such as re-grinding of middlings, multiple flotation, magnetic separation, and separate flotation, and adopts a new process flow route to achieve the effect of improving the recovery rate of lepidolite. The present invention returns the tailings obtained by gravity separation and the magnetic materials obtained by magnetic separation, as well as the scavenging concentrate obtained by flotation and the magnetic materials obtained by desludging overflow high-gradient magnetic separation, through a hydrocyclone for re-grinding and re-screening, fully extracting and utilizing the mineral components, reducing the waste of tailings, and increasing the recovery of lepidolite. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic flow diagram of the process steps of the present invention. DETAILED DESCRIPTION

[0017] The preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0018] Reference Figure 1 As shown, the present invention provides a process for extracting lithium mica from lithium-containing china clay ore with a high recovery rate, and the specific technical scheme is as follows: Step S1, the lithium-containing china clay ore is put into a linear screen for pre-screening, the sieve hole diameter is 1.5-2.0 mm, and the upper material is put into a ball mill for grinding.

[0019] Step S2, combining the material ground in the first ball mill in step S1 and the material under the linear screen in step S1 and entering the spiral classifier, and the returned sand from the spiral classifier enters the second ball mill for grinding.

[0020] Step S3, feeding the grinding product of the ball mill 2 in step S2 into the spiral classifier in step S2 for classification to obtain an overflow product, and the fineness of the overflow product is controlled to be greater than 85% of -0.2 mm.

[0021] Step S4, feeding the overflow of the spiral classifier in step S3 into a weak magnetic machine for iron removal, and removing iron through two weak magnetic separations to obtain magnetic and non-magnetic materials.

[0022] Step S4 further includes feeding the overflow of the spiral classifier in step S3 into a first-stage weak magnetic separator, the first-stage weak magnetic separator obtains magnetic and non-magnetic materials, the obtained non-magnetic materials enter the second-stage weak magnetic separator to obtain magnetic and non-magnetic materials, the magnetic materials of the first-stage weak magnetic separator and the magnetic materials of the second-stage weak magnetic separator are combined and enter step S5 for processing, and the non-magnetic materials of the second-stage weak magnetic separator enter step S6 for processing.

[0023] Step S5, feeding the magnetic product obtained in step S4 into deep cone sedimentation and concentration, and feeding the concentrated product into a plate and frame filter press, and the product becomes the final iron ore concentrate after filtration.

[0024] Step S6, feeding the non-magnetic material obtained in step S4 into the Buliu shaking table for gravity separation, recovering tantalum-tin mixed minerals from the gravity separation concentrate, and also generating gravity separation ore and gravity separation tailings.

[0025] Step S7, desludging the gravity-selected tailings obtained in step S6 by hydrocyclone, the underflow of the hydrocyclone enters flotation, and the overflow of the hydrocyclone enters deep cone sedimentation and concentration.

[0026] Step S7 further includes: the hydrocyclone desludging process uses two-stage hydrocyclones, the material of the gravity tailings first enters the first-stage hydrocyclone, the underflow of the first-stage hydrocyclone enters the second-stage hydrocyclone, the underflow of the second-stage hydrocyclone enters the flotation process of step S8, and the overflow of the first-stage hydrocyclone and the overflow of the second-stage hydrocyclone are combined and enter the deep cone sedimentation concentration together.

[0027] Step S8, the bottom flow of the hydrocyclone in step S7 is fed into the flotation stirring barrel, the bottom flow fineness of the hydrocyclone is controlled to be greater than 80% of -0.2mm, the flotation process adopts one roughing, two scavenging and two concentrating processes, the roughing concentrate is fed into the concentrating process one, the concentrating process one concentrate is fed into the concentrating process two, the concentrate of the concentrating process two is lithium mica slurry, the concentrating process one intermediate ore is returned to the roughing, the concentrating process two intermediate ore is returned to the concentrating process one, the roughing tailings enter the scavenging process one, the scavenging tailings are fed into the scavenging process two, to obtain the scavenging process two concentrate and tailings, and the scavenging process two concentrate is returned to the scavenging process one.

[0028] Step S9: The secondary concentrate in step S8 is selected as lepidolite slurry, which is fed into a belt filter for dehydration to finally obtain finished lepidolite.

[0029] Step S10, feed the tailings in step S8 into high gradient strong magnetic separation to obtain magnetic and non-magnetic materials, and combine the obtained magnetic materials with the scavenging concentrate obtained in step S8 and the gravity separation tailings obtained in step S6.

[0030] Step S11, feed the combined material in step S10 into the mill re-selection shaking table tailings middling pump pool, and then feed it into the hydrocyclone for classification, the overflow of the hydrocyclone is fed into the linear screen of step S1 for screening, and the bottom flow of the hydrocyclone is fed into the ball mill 2 of step S2 for grinding.

[0031] Step S12, feeding the non-magnetic material in step S10 into a spiral classifier for classification, and feeding the sand returned from the spiral classifier into a belt filter for dehydration to obtain the final product, glass sand.

[0032] The present invention further includes a process for extracting ceramic feldspar and ultrafine feldspar, which specifically includes the following steps: Step S13, the overflow of the hydrocyclone in step S7 enters the deep cone sedimentation and concentration product and enters the high gradient magnetic separator to obtain magnetic and non-magnetic materials. The obtained magnetic materials are combined with the magnetic materials obtained in step S10, the scavenging concentrate obtained in step S8, and the gravity separation tailings obtained in step S6, and the operation of step S11 is performed together.

[0033] Step S14, the non-magnetic material obtained by the high gradient magnetic separator in step S13 is sent to a deep cone sedimentation concentration machine, and then sent to a filter press to obtain ultrafine feldspar.

[0034] In step S15, a portion of the non-magnetic material entering the deep cone sedimentation concentration in step S14 and the overflow of the spiral classifier in step S12 are combined and sent to the belt filter together to obtain ceramic feldspar.

[0035] 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.

[0036] 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: The comparative example is that the prior art 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 a ball mill is used for grinding, a five-layer high-frequency vibrating screen is used for screening, 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 within the range of 1080-1500 times / minute and 3-5mm respectively, a hydrocyclone is used for desludging, and a one-roughing and two-sweeping closed-circuit process is used for flotation, 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 within the range of 18-25°C.

[0037] The products obtained from the two groups of tests were measured and recorded, and the obtained lepidolite products were measured and counted. The test results of the comparison group and the embodiment of the present invention are shown in Table 1 below.

[0038]

[0039] It can be seen from Table 1 above that the recovery rate of the lithium mica concentrate obtained in the embodiment of the present invention reaches 76.96%, the lithium oxide content in the obtained lithium mica concentrate reaches 2.60%, and the content in the tailings is as low as 0.135%, which is at a higher level. Compared with the recovery rate of 69.58% of the comparative example, it has been significantly improved, and the process effect of improving the lithium cloud recovery rate has been achieved. Therefore, when using the process method of the present invention for lithium-containing china clay ore, it has a better lithium mica concentrate recovery rate, so that lithium resources can be efficiently recovered.

[0040] 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 recovering lithium mica from lithium-containing china clay ore, characterized in that: The following steps are involved: Step S1, the lithium-containing china clay ore is put into a linear screen for pre-screening, the sieve hole diameter is 1.5-2.0 mm, and the upper material is put into a ball mill for grinding; Step S2, combining the material ground in the ball mill 1 in step S1 and the material under the linear screen in step S1 into a spiral classifier, and the returned sand from the spiral classifier enters the ball mill 2 for grinding; Step S3, feeding the grinding product of the ball mill 2 in step S2 into the spiral classifier in step S2 for classification to obtain an overflow product, wherein the fineness of the overflow product is controlled to be greater than 85% of -0.2 mm; Step S4, feeding the overflow of the spiral classifier in step S3 into a weak magnetic machine for iron removal, and removing iron through two weak magnetic separations to obtain magnetic and non-magnetic materials; Step S5, feeding the magnetic product obtained in step S4 into a deep cone sedimentation concentration, and feeding the concentrated product into a plate and frame filter press, and the product becomes the final finished iron ore concentrate after filtration; Step S6, feeding the non-magnetic material obtained in step S4 into a Buliu shaking table for gravity separation, recovering tantalum-tin mixed minerals from the gravity separation concentrate, and also generating gravity separation ore and gravity separation tailings; Step S7, desludging the gravity-selected tailings obtained in step S6 by a hydrocyclone, the underflow of the hydrocyclone enters flotation, and the overflow of the hydrocyclone enters deep cone sedimentation and concentration; Step S8, the underflow of the hydrocyclone in step S7 is fed into a flotation stirring barrel, the underflow fineness of the hydrocyclone is controlled to be greater than 80% of -0.2mm, the flotation process adopts one roughing, two scavenging and two concentrating processes, the roughing concentrate is fed into the concentrating process one, the concentrating concentrate is fed into the concentrating process two, the concentrate of the concentrating process two is lithium mica slurry, the concentrating medium ore is returned to the roughing, the concentrating medium ore is returned to the concentrating process one, the roughing tailings enter the scavenging process one, the scavenging tailings are fed into the scavenging process two, to obtain the scavenging concentrate and tailings, and the scavenging concentrate is returned to the scavenging process one; Step S9: The secondary concentrate in step S8 is selected as lepidolite slurry, which is fed into a belt filter for dehydration to finally obtain finished lepidolite.

2. The process for extracting lithium mica from lithium-containing china clay ore according to claim 1, characterized in that: Step S4 further includes feeding the overflow of the spiral classifier in step S3 into a first-stage weak magnetic separator, the first-stage weak magnetic separator obtains magnetic and non-magnetic materials, the obtained non-magnetic materials enter the second-stage weak magnetic separator to obtain magnetic and non-magnetic materials, the magnetic materials of the first-stage weak magnetic separator and the magnetic materials of the second-stage weak magnetic separator are combined and enter step S5 for processing, and the non-magnetic materials of the second-stage weak magnetic separator enter step S6 for processing.

3. The process for extracting lithium mica from lithium-containing china clay ore according to claim 1, characterized in that: Step S7 further includes: the hydrocyclone desludging process uses two-stage hydrocyclones, the material of the gravity tailings first enters the first-stage hydrocyclone, the underflow of the first-stage hydrocyclone enters the second-stage hydrocyclone, the underflow of the second-stage hydrocyclone enters the flotation process of step S8, and the overflow of the first-stage hydrocyclone and the overflow of the second-stage hydrocyclone are combined and enter the deep cone sedimentation concentration together.

4. The process for extracting lithium mica from lithium-containing china clay ore according to claim 1, characterized in that: Further including, Step S10, subjecting the tailings in step S8 to high gradient strong magnetic separation to obtain magnetic and non-magnetic materials, and combining the obtained magnetic materials with the scavenging concentrate obtained in step S8 and the gravity separation tailings obtained in step S6; Step S11, feed the combined material in step S10 into the mill re-selection shaking table tailings middling pump pool, and then feed it into the hydrocyclone for classification, the overflow of the hydrocyclone is fed into the linear screen of step S1 for screening, and the bottom flow of the hydrocyclone is fed into the ball mill 2 of step S2 for grinding.

5. The process for extracting lithium mica from lithium-containing china clay ore according to claim 4, characterized in that: Further including, Step S12, feeding the non-magnetic material in step S10 into a spiral classifier for classification, and feeding the sand returned from the spiral classifier into a belt filter for dehydration to obtain the final product, glass sand.

6. The process for recovering lithium mica from lithium-containing china clay ore according to claim 5, characterized in that: Further including, Step S13, the overflow of the hydrocyclone in step S7 enters the product after deep cone sedimentation and concentration and enters the high gradient magnetic separator to obtain magnetic and non-magnetic materials, and the obtained magnetic materials are combined with the magnetic materials obtained in step S10, the scavenging concentrate obtained in step S8, and the gravity separation tailings obtained in step S6, and the operation of step S11 is performed together; Step S14, the non-magnetic material obtained by the high gradient magnetic separator in step S13 is sent to a deep cone sedimentation concentration machine, and then sent to a filter press to obtain ultrafine feldspar.

7. The process for extracting lithium mica from lithium-containing china clay ore according to claim 6, characterized in that: Further including, In step S15, a portion of the non-magnetic material entering the deep cone sedimentation concentration in step S14 and the overflow of the spiral classifier in step S12 are combined and sent to the belt filter together to obtain ceramic feldspar.

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