Lepidolite sulfate balling consolidation roasting system and process

Abstract

The invention discloses a lepidolite sulfate pelletizing, consolidating and roasting system and process, acidizing and roasting hot flue gas is introduced into a consolidation machine for secondary heat exchange with pellet materials, the humidity of pellets is reduced, a large number of pellets with high humidity are effectively prevented from being directly put into a kiln for high-temperature roasting, and the yield of the pellets is increased. And the working condition that the pellets are exploded and re-dispersed due to evaporation and expansion of water vapor is avoided, so that the tight degree of combination of the lepidolite and the sulfate is ensured, and the purpose of'consolidation 'is achieved. Compared with powder mixed kiln high-temperature roasting or direct kiln high-temperature roasting of pellets with relatively high humidity, the pellet material prepared and solidified by the system and the process has the advantages that lepidolite and sulfate can be tightly combined at high temperature and are not easy to disperse; the efficiency of a replacement reaction between ions such as sodium and potassium in sulfate and lithium ions in lepidolite is improved, and the effect of extracting lithium from lepidolite through a sulfate roasting method is enhanced.

Description

Technical Field

[0001] The invention relates to the field of lithium extraction by calcining lepidolite sulfate, and in particular to a lepidolite sulfate spheroidizing consolidation calcining system and process. Background Art

[0002] As a mineral rich in lithium, lepidolite is an important raw material for industrial lithium smelting. At present, sulfate roasting is one of the main methods for extracting lithium from lepidolite. The sulfate roasting method mainly involves mixing lepidolite with sulfates such as potassium sulfate, sodium sulfate or calcium sulfate and other auxiliary materials and roasting them at high temperature. The reaction principle is ion replacement at high temperature, that is, high temperature is used to destroy the mineral structure of lepidolite, making the structure loose. The sodium, potassium and other ions in the sulfate react with the lithium ions on the edge of the aluminum silicate structure in the lepidolite to replace the lithium and convert it into soluble lithium sulfate, which is then leached with water or dilute acid and filtered to extract the lithium.

[0003] According to the reaction principle of the above method, it can be known that enhancing the binding ability of lithium mica and sulfate and increasing the probability and efficiency of replacement reaction between sodium, potassium ions in sulfate and lithium ions in lithium mica to generate lithium sulfate are important means to optimize the lithium extraction effect of lithium mica sulfate roasting method.

[0004] In the prior art, Chinese patent CN202311770798.3 discloses a method for obtaining lithium compounds from lithium mica, which comprises mixing lithium mica ore with sodium potassium sulfate, lime, and calcium carbonate, pressing the mixture into balls, and then roasting the mixture to obtain clinker; Chinese patent CN201710269968.8 discloses a method for extracting lithium from lithium mica concentrate, which comprises mixing lithium mica concentrate, calcium sulfate, a barium sulfate source, and a carbonaceous fuel into balls, and then roasting the balls to obtain roasted pellets. Compared with the mixed roasting of lithium mica powder and sulfate powder, the above two patent schemes adopt the method of mixing lithium mica with sulfate and other auxiliary materials, pressing the mixture into balls, and then roasting the balls, which increases the tightness of the combination between lithium mica and sulfate, and improves the lithium extraction effect of lithium mica sulfate roasting method to a certain extent.

[0005] However, in the above scheme, after the mixed materials are pressed into balls, they are directly fed into the kiln for calcination reaction. The temperature above 300°C at the kiln tail of the feed material will cause the moisture in the pellets to evaporate rapidly into water vapor. The pellets are affected by the volume expansion of the water vapor in the body and are very likely to "explode" immediately after entering the kiln, causing some tightly bound pellets to be dispersed again, reducing the effect of pressing into balls to increase the degree of bonding between lithium mica and sulfate. In addition, after balling, the material is directly fed into the kiln for calcination, the temperature rise range of the material is large, the required kiln size is large, and the energy consumption is high, which leads to an increase in the system construction and production operation costs.

[0006] It can be seen that how to ensure that the pellets do not explode on a large scale after entering the kiln, how to improve the roasting effect of lithium mica, and how to reduce the energy consumption of the system and reduce the cost of system construction and production operation are the problems that need to be solved urgently in the current lithium mica sulfate roasting process. Summary of the invention

[0007] In order to overcome the above-mentioned deficiencies in the prior art, the present invention provides a lepidolite sulfate pelletizing consolidation and roasting system, which enhances the stability of pelletized materials through mixing, pelletizing, consolidation, acidification and roasting processes, improves the lithium extraction effect of lepidolite sulfate roasting, and makes full use of the heat energy in the system to reduce the system construction and production operation costs. The specific technical scheme is as follows:

[0008] The lepidolite sulfate pelletizing consolidation roasting system comprises a material bin group, a mixer, a pelletizing machine, a consolidation machine and an acidification rotary kiln which are connected in sequence.

[0009] The material bin group includes a lithium mica bin, an auxiliary material bin, and a water storage tank, the discharge ports of which are connected to the feed port of the mixer, and the auxiliary materials in the auxiliary material bin include calcium sulfate dihydrate, potassium sulfate, sodium sulfate, and calcium carbonate. The lithium mica powder, auxiliary materials, and water are put into the mixer in a certain proportion through a metering device, and the mixer is used to fully mix the above materials to obtain a uniformly proportioned mixture, which is then transported to the ball press machine through a conveying device.

[0010] The material outlet of the mixer is connected to the material inlet of the ball press, and the ball press presses the fed mixed material into compact and dense balls, which are then transported to the consolidation machine through a conveying device.

[0011] The consolidation machine includes a shell, a circulating fan, a circulating air duct, a diaphragm, a grate machine, a supporting frame for the grate machine, an external exhaust duct and an external exhaust fan. A feed port is provided at the upper part of one end of the shell, and a discharge port is provided at the lower part of the other end. The feed port is connected to the briquette press, and the discharge port is connected to the acidification roasting kiln; the diaphragm is vertically provided in the middle of the shell, and the interior of the consolidation machine is divided into a drying chamber and a consolidation chamber. The drying chamber is close to the feed port of the consolidation machine, and the consolidation chamber is close to the discharge port of the consolidation machine; an empty chamber is provided in the middle of the diaphragm, and the grate machine is provided in the middle of the consolidation machine. The grate machine divides the drying chamber and the consolidation chamber into upper and lower parts respectively; the circulating air duct is provided outside the shell, and the air inlet is provided at the lower part of the consolidation chamber and is connected to the circulating air duct; the circulating air duct is provided above the shell, and the air outlet is provided at the upper part of the drying chamber; the air inlet of the external exhaust duct is provided at the lower part of the drying chamber, and the external exhaust duct is connected to the external exhaust fan.

[0012] The pelletized material fed from the feed port falls on the grate machine in the drying chamber to form a material layer, which is driven by the grate machine (511) to move toward the consolidation chamber. During this process, the pelletized material exchanges heat with the hot flue gas exhausted by the circulation fan. The hot flue gas is sucked by the external exhaust fan and penetrates the material layer from top to bottom. The pelletized material exchanges heat in sequence, and the temperature increases and the humidity decreases. The grate machine drives the material layer to pass through the hollow of the transverse partition and enter the consolidation chamber, and exchanges heat with the hot flue gas in the upper part of the consolidation chamber. The hot flue gas is sucked by the circulation fan and penetrates the material layer from top to bottom. The pelletized material exchanges heat in sequence, and the temperature increases and the humidity decreases. The pelletized material completes the secondary heat exchange in succession, is transported to the consolidation machine outlet, and flows out along the consolidation machine outlet.

[0013] The discharge port of the consolidation machine is connected to the tail of the acidification rotary kiln. The pelletized material that has completed the secondary heat exchange enters the acidification rotary kiln for acidification and roasting at 900~1000℃ to obtain acid clinker.

[0014] The flow process of hot flue gas generated by the acidification rotary kiln is as follows: the hot flue gas generated during the acidification roasting process is discharged from the rotary kiln and first enters the upper part of the consolidation chamber. The circulating fan is started. Since the air inlet of the circulating air duct is set at the lower part of the consolidation chamber, the hot flue gas is affected by the suction of the circulating fan and penetrates the material layer and the grate machine from the upper part of the consolidation chamber to the lower part of the consolidation chamber. The material layer in the consolidation chamber is affected by the hot flue gas, which reduces the humidity of the pelletized material. The hot flue gas that passes through the material layer is sucked and discharged to the upper part of the drying chamber along the circulating air duct by the circulating fan (a small amount of hot flue gas enters the upper part of the drying chamber from the empty cavity of the transverse partition). The hot flue gas sinks and exchanges heat with the material layer in the drying chamber. The external exhaust fan is started. The hot flue gas is accelerated to sink by the suction of the external exhaust fan and penetrates the material layer and the grate machine to enter the lower part of the drying chamber. It is sucked out of the consolidation machine along the external exhaust duct by the external exhaust fan.

[0015] Furthermore, for the transportation of materials and gases between the system including but not limited to material bin groups, mixers, briquette presses, consolidation machines, and acidification rotary kilns, conventional transportation equipment or facilities such as belt conveyors, screw conveyors, pipelines, etc. can be selected for transportation according to actual working conditions.

[0016] Furthermore, the lepidolite sulfate pelletizing and consolidation roasting system of the present invention also includes an exhaust gas treatment device, which is connected to an external exhaust fan; the exhaust gas treatment device includes a high-temperature resistant bag filter, an exhaust fan and a chimney connected in sequence; the smoke inlet of the high-temperature resistant bag filter is connected to the external exhaust fan, and the ash hopper is connected to the ball press. The smoke discharged by the consolidation machine is treated by the exhaust gas treatment device, and the smoke that meets the requirements is discharged from the chimney, and the solid collected by the high-temperature resistant bag filter is transported to the ball press.

[0017] The present invention also provides a lepidolite sulfate ball-forming consolidation roasting process, and the specific technical scheme is as follows: the lepidolite sulfate ball-forming consolidation roasting process comprises:

[0018] Step S1. Fully mix the lepidolite powder, auxiliary materials and water to prepare a mixture.

[0019] The specific working process is as follows: lithium mica powder, auxiliary materials and water are put into the mixer in a certain proportion through a metering device, and the above materials are fully mixed by the mixer to obtain a uniformly proportioned mixture, which is then transported to the pelletizing machine through a conveying equipment.

[0020] The mass ratio of lithium mica powder, auxiliary materials and water is 100:70~80:5~18, and the mass ratio of calcium sulfate dihydrate, potassium sulfate, sodium sulfate and calcium carbonate in the auxiliary materials is 35~40:28~33:8~13:3~7.

[0021] Step S2. Making the mixed material into pelletized material

[0022] The specific working process is as follows: the mixer outlet is connected to the ball press feed port, the ball press presses the fed mixture into compact and dense balls, and transports them to the consolidation machine through conveying equipment.

[0023] Among them, the particle size of the pelletized material is 30~50mm.

[0024] Step S3: Consolidation of pelletized material

[0025] The specific working process is as follows: the pelletizing material is fed from the feeding port of the consolidation machine and falls on the grate machine in the drying chamber to form a material layer, which is driven by the grate machine to move to the consolidation chamber. In this process, the pelletizing material exchanges heat with the hot flue gas discharged by the circulating fan. The hot flue gas is sucked by the external exhaust fan to penetrate the material layer from top to bottom. The pelletizing material exchanges heat in turn, and the temperature increases and the humidity decreases; the grate machine drives the material layer to pass through the empty cavity of the transverse partition into the consolidation chamber and exchanges heat with the hot flue gas in the upper part of the consolidation chamber. The hot flue gas is sucked by the circulating fan to penetrate the material layer from top to bottom. The pelletizing material exchanges heat in turn, and the temperature increases and the humidity decreases; the pelletizing material completes the secondary heat exchange and is transported to the discharge port of the consolidation machine and flows out along the discharge port of the consolidation machine.

[0026] Step S4: Acidification and roasting of pelletized materials to prepare acid clinker

[0027] The specific working process is as follows: the pelletized material that has completed the secondary heat exchange enters the acidification rotary kiln from the consolidation machine, is acidified and roasted at 900~1000℃ to obtain acid clinker.

[0028] Step S5. Treatment of exhaust gas from the consolidation machine

[0029] The specific working process is as follows: the flue gas discharged from the consolidation machine is dust-removed through the exhaust gas treatment device, and the flue gas that meets the requirements after treatment is discharged from the chimney. The solids collected by the high-temperature resistant bag dust collector are transported to the ball press.

[0030] Compared with the prior art, the present invention has the following advantages and beneficial effects:

[0031] The lepidolite sulfate pelletizing consolidation roasting system and process disclosed by the invention firstly performs full and uniform mixing by a mixer, effectively ensuring that the proportion of each material in the pellets obtained subsequently matches the reaction relationship between lepidolite and sulfate; and presses the mixed material into balls by a ball press, thereby improving the tightness of the combination of lepidolite and sulfate and improving the replacement reaction efficiency; and then, the hot flue gas of acidification roasting is passed into a consolidation machine for secondary heat exchange with the pellet material, so as to appropriately reduce the humidity of the pellets, effectively preventing a large number of pellets with high humidity from being directly put into a kiln for high-temperature roasting, and preventing the occurrence of a working condition in which the pellets explode and disperse again due to the evaporation and expansion of water vapor, further ensuring the tightness of the combination of lepidolite and sulfate, and achieving the purpose of "consolidation".

[0032] Compared with powder mixed into a kiln for high temperature roasting or pellets with high humidity directly into a kiln for high temperature roasting, the pellets prepared and consolidated by this system and process can combine lithium mica and sulfate tightly at high temperature and are not easy to disperse, which improves the efficiency of the replacement reaction between sodium, potassium ions in sulfate and lithium ions in lithium mica, and enhances the effect of lithium extraction by lithium mica sulfate roasting method.

[0033] (2) The lithium mica sulfate pelletizing consolidation roasting system and process disclosed in the present invention creatively sets a consolidation machine / consolidation process, firstly passes the hot flue gas from the acidification roasting into the consolidation machine for secondary heat exchange with the pelletizing material, thereby increasing the temperature of the pelletizing material entering the kiln. Compared with the technical solution of directly putting the material into the kiln for roasting, it fully utilizes the high-temperature waste heat of the acidification roasting process, effectively reduces the overall energy consumption of the system, and reduces the production and operation costs. In addition, the temperature rise range of the material becomes smaller, which can reduce the specifications of the acidification roasting kiln and reduce the manufacturing cost of the equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 It is a schematic diagram of the process flow of the lepidolite sulfate spheroidization consolidation roasting system disclosed in the present invention;

[0035] Figure 2 It is the material flow diagram in the lepidolite sulfate spheroidization consolidation roasting system;

[0036] Figure 3 This is the flow diagram of the hot flue gas generated by the acidification rotary kiln in the consolidation machine.

[0037] In the figure: 11-lepidolite silo, 12-auxiliary material silo, 13-water storage tank, 2-mixer, 3-ball press, 4-belt conveyor, 5-consolidation machine, 51-shell, 52-drying room, 53-circulation fan, 54-circulation air duct, 55-consolidation chamber, 56-empty chamber, 57-cross partition, 58-grate machine support frame, 59-external exhaust fan, 510-external exhaust duct, 511-grate machine, 6-acidification rotary kiln, 7-high temperature resistant bag dust collector, 8-exhaust fan, 9-chimney. DETAILED DESCRIPTION

[0038] In order to make the purpose, technical solution and advantages of the present invention clearer, the embodiments of the present invention will be further described below in conjunction with the accompanying drawings. The following is a preferred embodiment of the present invention, which is intended to provide a basic understanding of the present invention, but is not intended to confirm the key or decisive elements of the present invention or to limit the scope of protection.

[0039] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "communication" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0040] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments, but the implementation manner of the present invention is not limited thereto.

[0041] Embodiment 1:

[0042] See attached Figure 1-3 This embodiment discloses a lithium mica sulfate ball consolidation roasting system, including a material bin group, a mixer 2, a ball press 3, a consolidation machine 5, and a rotary kiln 6 connected in sequence.

[0043] The material bin group includes a lithium mica bin 11, an auxiliary material bin 12, and a water storage tank 13, the discharge ports of which are connected to the feed port of the mixer 2, and the auxiliary materials in the auxiliary material bin 11 include calcium sulfate dihydrate, potassium sulfate, sodium sulfate, and calcium carbonate. The lithium mica powder, auxiliary materials, and water are put into the mixer 2 in a certain proportion through a metering device, and the above materials are fully mixed by the mixer 2 to obtain a uniformly proportioned mixture, which is transported to the ball press 3 through a conveying device.

[0044] The discharge port of the mixer 2 is connected to the feed port of the ball press 3. The ball press 3 presses the fed mixed material into compact and dense balls, and transports them to the consolidation machine 5 through a conveying device.

[0045] The consolidating machine 5 comprises a housing 51, a circulating fan 53, a circulating air duct 54, a diaphragm 57, a grate machine 511, a grate machine support frame 58, an external exhaust duct 510 and an external exhaust fan 59. The housing 51 is provided with a feed port at the upper part of one end and a discharge port at the lower part of the other end. The feed port is connected to the briquette press 3, and the discharge port is connected to the rotary kiln 6; the diaphragm 57 is vertically arranged in the middle of the housing 51, dividing the interior of the consolidating machine 5 into a drying chamber 52 and a consolidating chamber 55. The drying chamber 52 is close to the feed port of the consolidating machine 5, and the consolidating chamber 55 is close to the discharge port of the consolidating machine 5; an empty chamber 56 is arranged in the middle of the diaphragm 57, and the grate machine 511 is arranged at the consolidating chamber 52. In the middle of the consolidation machine 5, the grate machine 511 divides the drying chamber 52 and the consolidation chamber 55 into upper and lower parts respectively; the circulating air duct 54 is arranged outside the shell 51, and the air inlet 56 is arranged at the lower part of the consolidation chamber 55, and is connected with the circulating fan 53; the circulating fan 53 is arranged above the shell 51, and the exhaust port is connected with the upper part of the drying chamber 52; the air inlet of the external exhaust duct 58 is arranged at the lower part of the drying chamber 52, and the external exhaust duct 53 is connected with the external exhaust fan 56.

[0046] The pellet material fed from the feed port falls on the grate machine 511 in the drying chamber 52 to form a material layer, which is driven by the grate machine 511 to move toward the consolidation chamber 55. During this process, the pellet material exchanges heat with the hot flue gas discharged from the circulating fan 33. The hot flue gas is sucked by the external exhaust fan 59 to penetrate the material layer from top to bottom. The pellet material exchanges heat in turn, and the temperature increases and the humidity decreases; the grate machine 511 drives the material layer to pass through the hollow chamber 56 of the transverse partition 57 and enter the consolidation chamber 55, and exchanges heat with the hot flue gas in the upper part of the consolidation chamber 5. The hot flue gas is sucked by the circulating fan 33 to penetrate the material layer from top to bottom. The pellet material exchanges heat in turn, and the temperature increases and the humidity decreases; the pellet material completes the secondary heat exchange in succession, is transported to the discharge port of the consolidation machine 5, and flows out along the discharge port of the consolidation machine 5.

[0047] The discharge port of the consolidator 5 is connected to the tail of the acidification rotary kiln 6. The pelletized material that has completed the secondary heat exchange enters the rotary kiln 6 for acidification and roasting at 900-1000°C to obtain acid clinker.

[0048] More specifically, the hot flue gas generated by the acidification rotary kiln 6 flows as follows: the hot flue gas generated during the acidification roasting process is discharged from the acidification rotary kiln 6 and first enters the upper part of the consolidation chamber 55, and the circulating fan 33 is started. Since the air inlet of the circulating air duct 54 is arranged at the lower part of the consolidation chamber 55, the hot flue gas is sucked by the circulating fan 33 and penetrates the material layer and the grate machine 511 from the upper part of the consolidation chamber 55 to the lower part of the consolidation chamber 55. The material layer in the consolidation chamber 55 is acted on by the hot flue gas, so that the pellets are The humidity of the material is reduced, and the hot flue gas that passes through the material layer is sucked by the circulating fan 33 along the circulating air duct 54 and discharged to the upper part of the drying chamber 52. A small amount of hot flue gas enters the upper part of the drying chamber through the hollow space of the transverse partition, and the hot flue gas sinks and exchanges heat with the material layer in the drying chamber 52. The external exhaust fan 59 is started, and the hot flue gas is accelerated to sink by the suction force of the external exhaust fan 59 and penetrates the material layer and the grate machine 511 to enter the lower part of the drying chamber 52, and is sucked by the external exhaust fan 59 along the external exhaust air duct 53 to the outside of the consolidation machine 5.

[0049] Furthermore, for the transportation of materials and gases between the material bin group, the mixer 2, the briquette press 3, the consolidation machine 5, and the acidification rotary kiln 6, conventional conveying equipment or facilities are selected for transportation according to actual working conditions, such as belt conveyors, screw conveyors, pipelines, etc. More specifically, the pelletized materials are transported between the briquette press 3 and the consolidation machine 5 by a belt conveyor 4.

[0050] Embodiment 2:

[0051] See attached Figure 1 , 2 Based on Example 1, this embodiment further provides an exhaust gas treatment device.

[0052] The tail gas treatment device is connected to the external exhaust fan 59; the tail gas treatment device includes a high temperature resistant bag filter 7, a tail gas fan 8 and a chimney 9 connected in sequence; the smoke inlet of the high temperature resistant bag filter 7 is connected to the external exhaust fan 59, and the ash hopper is connected to the ball press 3. The smoke discharged by the consolidation machine is treated by the tail gas treatment device, and the smoke that meets the requirements is discharged from the chimney, and the solid collected by the high temperature resistant bag filter 7 is transported to the ball press 3.

[0053] The other parts of this embodiment are the same as those of Embodiment 1, and thus will not be described in detail.

[0054] Embodiment 3:

[0055] This embodiment provides a lepidolite sulfate spheroidization consolidation roasting process, comprising:

[0056] Step S1. Fully mix the lepidolite powder, auxiliary materials and water to prepare a mixture.

[0057] The specific working process is as follows: lithium mica powder, auxiliary materials and water are put into the mixer 2 according to a certain proportion through a metering device, and the above materials are fully mixed by the mixer 2 to obtain a uniform mixture, which is transported to the ball press 3 through a conveying equipment.

[0058] Step S2. Making the mixed material into pelletized material

[0059] The specific working process is as follows: the discharge port of the mixer 2 is connected to the feed port of the ball press 3, the ball press 3 presses the fed mixed material into compact and dense balls, and transports them to the consolidation machine 5 through the conveying equipment.

[0060] Step S3: Consolidation of pelletized material

[0061] The specific working process is as follows: the pellet material is fed from the feed port of the consolidation machine and falls on the grate machine 511 in the drying chamber 52 to form a material layer, and the grate machine 511 drives the material layer to move toward the consolidation chamber. During this process, the pellet material exchanges heat with the hot flue gas discharged by the circulating fan 33. The hot flue gas is sucked by the external exhaust fan 59 to penetrate the material layer from top to bottom. The pellet material exchanges heat in turn, and the temperature increases and the humidity decreases; the grate machine 511 drives the material layer to pass through the empty chamber 56 of the transverse partition 57 and enter the consolidation chamber 55, and exchanges heat with the hot flue gas in the upper part of the consolidation chamber 5. The hot flue gas is sucked by the circulating fan 33 to penetrate the material layer from top to bottom. The pellet material exchanges heat in turn, and the temperature increases and the humidity decreases; the pellet material completes the secondary heat exchange and is transported to the discharge port of the consolidation machine 5, and flows out along the discharge port of the consolidation machine 5.

[0062] Step S4: Acidification and roasting of pelletized materials to prepare acid clinker

[0063] The specific working process is as follows: the pelletized material that has completed the secondary heat exchange enters the acidification rotary kiln 6 from the consolidator 5, and is acidified and roasted at 900-1000°C to obtain acid clinker.

[0064] Step S5. Treatment of exhaust gas from the consolidation machine

[0065] The specific working process is as follows: the flue gas discharged by the consolidation machine 5 is subjected to dust removal treatment by the exhaust gas treatment device, and the flue gas that meets the requirements after treatment is discharged from the chimney, and the solids collected by the high-temperature resistant bag dust collector 7 are transported to the ball press 3.

[0066] More specifically, in step S1, the mass ratio of lithium mica powder, auxiliary materials and water is 100:70~80:5~18; the mass ratio of calcium sulfate dihydrate, potassium sulfate, sodium sulfate and calcium carbonate in the auxiliary materials is 35~40:28~33:8~13:3~7; in step S2, the particle size of the pelletized material is 30~50mm.

[0067] More specifically, step S5. Treatment of flue gas discharged from the consolidation machine, the specific working process is as follows: the hot flue gas generated during the acidification roasting process is discharged from the rotary kiln 6 and first enters the upper part of the consolidation chamber 55, and the circulating fan 33 is started. Since the air inlet of the circulating air duct 54 is arranged at the lower part of the consolidation chamber 55, the hot flue gas is sucked by the circulating fan 33, and penetrates the material layer and the grate machine 511 from the upper part of the consolidation chamber 55 to the lower part of the consolidation chamber 55. The material layer in the consolidation chamber 55 is affected by the hot flue gas, so that the humidity of the pellet material is reduced, and the hot flue gas passing through the material layer is sucked along the circulating air duct 54 by the circulating fan 33. A small amount of hot flue gas sucked and discharged to the upper part of the drying chamber 52 enters the upper part of the drying chamber through the hollow space of the transverse partition, and the hot flue gas sinks to exchange heat with the material layer in the drying chamber 52. The external exhaust fan 59 is started, and the hot flue gas is accelerated to sink by the suction of the external exhaust fan 59 and penetrates the material layer and the grate machine 511 to enter the lower part of the drying chamber 52. It is sucked to the outside of the consolidating machine 5 along the external exhaust duct 53 by the external exhaust fan 59. The flue gas discharged by the consolidating machine 5 is dust-removed by the exhaust gas treatment device. The flue gas that meets the requirements after treatment is discharged from the chimney, and the solid collected by the high-temperature resistant bag dust collector 7 is transported to the ball press 3.

[0068] In this article, the directional words such as front, back, top, and bottom involved are defined by the positions of the parts in the drawings and the positions of the parts relative to each other, just for the sake of clarity and convenience in expressing the technical solution. It should be understood that they are relative concepts and can change accordingly according to different ways of use and placement, and the use of the directional words should not limit the scope of protection claimed in this application.

[0069] In the absence of conflict, the above embodiments and features in the embodiments may be combined with each other.

[0070] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A lepidolite sulfate spheroidizing and consolidating roasting system, characterized in that: A material bin group, a mixer (2), a pelletizing machine (3), a consolidating machine (5), and an acidification rotary kiln (6) are connected in sequence; The material bin group comprises a lepidolite bin (11), an auxiliary material bin (12), and a water storage tank (13), the discharge ports of the three being connected to the feed port of the mixer (2), and the auxiliary materials in the auxiliary material bin (11) comprise calcium sulfate dihydrate, potassium sulfate, sodium sulfate, and calcium carbonate; The material outlet of the mixer (2) is connected to the material inlet of the ball press (3), and the ball press (3) presses the fed mixed material into compact and dense balls, which are then transported to the consolidation machine (5) via a conveying device.

2. The lepidolite sulfate spheroidization and consolidation roasting system according to claim 1, characterized in that: The consolidating machine (5) comprises a shell (51), a circulating fan (53), a circulating air duct (54), a transverse partition (57), a grate machine (511), a grate machine support frame (58), an external exhaust duct (510) and an external exhaust fan (59); a feed port is provided at the upper portion of one end of the shell (51), and a discharge port is provided at the lower portion of the other end, the feed port is connected to the briquetting machine (3), and the discharge port is connected to the acidification roasting kiln (6); the transverse partition (57) is vertically arranged in the middle of the shell (51), and the interior of the consolidating machine (5) is divided into a drying chamber (52) and a consolidating chamber (55), the drying chamber (52) is close to the feed port of the consolidating machine (5), and the consolidating chamber (55) is close to the discharge port of the consolidating machine (5); An empty chamber (56) is arranged in the middle of the transverse partition (57); a grate machine (511) is arranged in the middle of the consolidating machine (5); the grate machine (511) divides the drying chamber (52) and the consolidating chamber (55) into upper and lower parts respectively; a circulating air duct (54) is arranged outside the shell (51); an air inlet (56) is arranged at the lower part of the consolidating chamber (55) and is connected to a circulating fan (53); the circulating fan (53) is arranged above the shell (51); an air outlet is connected to the upper part of the drying chamber (52); an air inlet of an external exhaust duct (58) is arranged at the lower part of the drying chamber (52); the external exhaust duct (53) is connected to the external exhaust fan (56); and a discharge port of the consolidating machine (5) is connected to an acidification rotary kiln (6).

3. The lepidolite sulfate spheroidization consolidation and roasting system according to claim 1 or 2, characterized in that: It also includes an exhaust gas treatment device, which is connected to an external exhaust fan (59); the exhaust gas treatment device includes a high-temperature resistant bag dust collector (7), an exhaust fan (8) and a chimney (9) which are connected in sequence; the smoke inlet of the high-temperature resistant bag dust collector (7) is connected to the external exhaust fan (59), and the ash hopper is connected to the ball press (3).

4. A lepidolite sulfate spheroidization consolidation roasting process, which is realized based on the lepidolite sulfate spheroidization consolidation roasting system according to any one of claims 1 to 3, characterized in that: The following steps are involved: Step S1. Fully mix the lepidolite powder, auxiliary materials and water to prepare a mixture. The specific working process is as follows: lithium mica powder, auxiliary materials and water are put into a mixer (2) according to a certain proportion through a metering device, the above materials are fully mixed by the mixer (2) to obtain a mixture with a uniform proportion, and the mixture is transported to a ball press (3) through a conveying device; Step S2. Making the mixed material into pelletized material The specific working process is as follows: the discharge port of the mixer (2) is connected to the feed port of the ball press (3), the ball press (3) presses the fed mixed material into compact and dense balls, and transports the balls to the consolidation machine (5) through the conveying equipment; Step S3: Consolidation of pelletized material The specific working process is as follows: the pelletized material is fed from the feed port of the consolidating machine and falls on the grate machine (511) in the drying chamber (52) to form a material layer. The grate machine (511) drives the material layer to move toward the consolidating chamber. During this process, the pelletized material exchanges heat with the hot flue gas discharged by the circulating fan (33). The hot flue gas is sucked by the external exhaust fan (59) to penetrate the material layer from top to bottom. The pelletized material exchanges heat in turn, and the temperature increases and the humidity decreases. The grate machine (511) drives the material layer to pass through the empty chamber (56) of the transverse partition (57) and enter the consolidating chamber (55), and exchanges heat with the hot flue gas in the upper part of the consolidating chamber (5). The hot flue gas is sucked by the circulating fan (33) to penetrate the material layer from top to bottom. The pelletized material exchanges heat in turn, and the temperature increases and the humidity decreases. The pelletized material completes the secondary heat exchange and is transported to the discharge port of the consolidating machine (5) and flows out along the discharge port of the consolidating machine (5). Step S4: Acidification and roasting of pelletized materials to prepare acid clinker The specific working process is as follows: the pelletized material that has completed the secondary heat exchange enters the acidification rotary kiln (6) from the consolidation machine (5) and is acidified and roasted at 900-1000°C to obtain acid clinker; Step S5. Treatment of exhaust gas from the consolidation machine The specific working process is as follows: the flue gas discharged from the consolidation machine is subjected to dust removal treatment by the tail gas treatment device, and the flue gas that meets the requirements after treatment is discharged from the chimney, and the solids collected by the high temperature resistant bag filter (7) are transported to the briquetting machine (3).

5. The lepidolite sulfate spheroidization and consolidation roasting process according to claim 4, characterized in that: In step S1, the mass ratio of lithium mica powder, auxiliary materials and water is 100:70-80:5-18; the mass ratio of calcium sulfate dihydrate, potassium sulfate, sodium sulfate and calcium carbonate in the auxiliary materials is 35-40:28-33:8-13:3-7; in step S2, the particle size of the pelletized material is 30-50 mm.

6. The lepidolite sulfate spheroidization and consolidation roasting process according to claim 4, characterized in that: Step S5. Treatment of flue gas discharged from the consolidation machine. The specific working process is as follows: the hot flue gas generated during the acidification roasting process is discharged from the rotary kiln (6) and first enters the upper part of the consolidation chamber (55). The circulating fan (33) is started. Since the air inlet of the circulating air duct (54) is arranged at the lower part of the consolidation chamber (55), the hot flue gas is acted upon by the suction force of the circulating fan (33). It penetrates the material layer and the grate machine (511) from the upper part of the consolidation chamber (55) and enters the lower part of the consolidation chamber (55). The material layer in the consolidation chamber (55) is acted upon by the hot flue gas, so that the humidity of the pelletized material is reduced. The hot flue gas that has passed through the material layer is discharged along the circulating air duct (54) by the circulating fan (33). The circulating fan (33) sucks and discharges the hot flue gas to the upper part of the drying chamber (52), and the hot flue gas sinks and exchanges heat with the material layer in the drying chamber (52). The external exhaust fan (59) is started, and the hot flue gas is accelerated to sink by the suction of the external exhaust fan (59) and penetrates the material layer and the grate machine (511) to enter the lower part of the drying chamber (52). The hot flue gas is sucked by the external exhaust fan (59) along the external exhaust duct (53) to the outside of the consolidating machine (5). The flue gas discharged from the consolidating machine (5) is subjected to dust removal treatment by the exhaust gas treatment device. The flue gas that meets the requirements after treatment is discharged from the chimney. The solid collected by the high temperature resistant bag filter (7) is transported to the briquetting machine (3).

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