Lithium ore pretreatment system

Abstract

The utility model relates to a lithium ore pretreatment system, and aims to effectively screen out foreign matters in raw lithium ore and ensure smooth production. Comprising a blanking bin, a quantitative belt weigher, a roasting kiln and a belt conveyor unit, a roller screen and a belt conveyor I are arranged between the blanking bin and the quantitative belt weigher; a foreign matter outlet at the bottom of the roller screen is positioned between the material inlet and the material outlet; materials flow into the feeding end of the first belt conveyor through an outlet of the discharging bin, then are conveyed to a feeding port of the rolling screen through the discharging end of the first belt conveyor and are conveyed to the quantitative belt weigher through a discharging port of the rolling screen. Foreign matters are discharged from a foreign matter outlet of the roller screen. The roller screen is used for screening foreign matters in raw lithium ores, and the foreign matters are discharged from the foreign matter outlet of the roller screen, so that the foreign matters are screened at the beginning of the working process of the lithium ore pretreatment system, the foreign matters are prevented from entering the subsequent process, and the normal operation of equipment of a whole production line can be ensured.

Description

Technical Field

[0001] The utility model relates to the technical field of lithium ore mining, in particular to a lithium ore pretreatment system. Background Art

[0002] Before extracting lithium from lithium ore, it is necessary to pre-treat the lithium ore to reduce the impact of impurities in the lithium ore, make lithium easier to extract, and improve the efficiency and purity of subsequent lithium extraction. Figure 1 As shown, the mined lithium ore is conveyed through a feed hopper 1 to a fixed-quantity belt scale 4, which then delivers it in fixed quantities to a belt conveyor unit 7. The belt conveyor unit 7 then conveys it to a three-stage preheating system 14 for preheating before transporting it to a roasting kiln 8 for roasting. The roasting exhaust gas undergoes denitrification treatment. However, during actual production, this lithium ore pretreatment system frequently encountered a problem with the electric double-layer air lock valve at the roasting kiln feed end. Investigation revealed that the high moisture content of the lithium ore and the presence of foreign matter in the ore were the primary causes of this frequent jamming. Utility Model Content

[0003] The purpose of the utility model is to provide a lithium ore pretreatment system, which can effectively screen out foreign matter in lithium ore and ensure smooth production.

[0004] The technical solution adopted by the utility model to solve its technical problems is: a lithium ore pretreatment system, including a discharge bin, a quantitative belt scale, a roasting kiln and a belt conveyor unit for transporting materials to the roasting kiln; a rolling screen and a belt conveyor are arranged between the discharge bin and the quantitative belt scale; a material inlet is arranged at the top of one end of the rolling screen, a material outlet is arranged at the bottom of the other end, and a foreign matter outlet is arranged at the bottom of the rolling screen, and the foreign matter outlet is located between the material inlet and the material outlet; the material flows from the outlet of the discharge bin into the feed end of the belt conveyor, and is then transported to the feed port of the rolling screen by the discharge end of the belt conveyor, and is transported to the quantitative belt scale by the discharge port of the rolling screen; foreign matter is discharged from the foreign matter outlet of the rolling screen.

[0005] Furthermore, a smoke inlet is provided at the bottom of the rolling screen near the discharge port end; a smoke exhaust port is provided at the top near the feed port end; the smoke inlet of the rolling screen is connected to the smoke outlet of the roasting kiln through a smoke conveying pipe 1; the smoke exhaust port of the rolling screen is connected to the denitrification treatment system through a smoke conveying pipe 2.

[0006] Furthermore, a rotary drum dryer is provided between the quantitative belt scale and the belt conveyor unit. The material conveyed by the quantitative belt scale enters the rotary drum dryer and is discharged from the outlet of the rotary drum dryer to the feed end of the belt conveyor unit.

[0007] Furthermore, the belt conveyor 1, the rolling screen and the quantitative belt scale are provided in two parallel groups.

[0008] Furthermore, a Y-shaped mixer is arranged between the quantitative belt scale and the rotary drum dryer, and the mixer includes inlet one, inlet two and an outlet; the outlets of the two quantitative belt scales are respectively aligned with the corresponding inlet one and inlet two of the mixer, and the outlet of the mixer is aligned with the inlet of the rotary drum dryer.

[0009] Furthermore, a flue gas inlet is provided at the bottom end of the tail of the rotary drum dryer, and a flue gas outlet is provided at the top end of the head; the flue gas outlet of the roasting kiln and the flue gas inlet of the rotary drum dryer are connected in three phases through a flue gas conveying pipe; the flue gas outlet of the rotary drum dryer and the denitrification treatment system are connected in four phases through a flue gas conveying pipe.

[0010] The beneficial effects of this utility model are as follows: A rolling screen screens foreign matter from the raw lithium ore and discharges it from the screen's foreign matter outlet, where it can be collected in a foreign matter bag or bin. By screening foreign matter at the beginning of the lithium ore pretreatment system workflow, it prevents it from entering subsequent processes, ensuring the normal operation of the entire production line. The belt conveyor, which transports material from the lower hopper to the higher rolling screen, avoids the limited lift height of the on-site excavator bucket. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 It is a schematic diagram of the prior art;

[0012] Figure 2 This is a schematic diagram of the lithium ore pretreatment system disclosed in this utility model.

[0013] As shown in the figure: unloading silo 1, belt conveyor 1 2, rolling screen 3, quantitative belt scale 4, mixer 5, rotary drum dryer 6, belt conveyor unit 7, roasting kiln 8, denitrification treatment system 9, flue gas conveying duct 1 10, flue gas conveying duct 2 11, flue gas conveying duct 3 12, flue gas conveying duct 4 13, and three-stage preheating system 14. DETAILED DESCRIPTION

[0014] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0015] Lithium ore pretreatment system, such as Figure 2As shown, it includes a feeding bin 1, a quantitative belt scale 4, a roasting kiln 8 and a belt conveyor unit 7 for transporting materials to the roasting kiln 8; a rolling screen 3 and a belt conveyor 2 are arranged between the feeding bin 1 and the quantitative belt scale 4; a material inlet is arranged at the top of one end of the rolling screen 3, and a material outlet is arranged at the bottom of the other end, and a foreign matter outlet is arranged at the bottom of the rolling screen 3, and the foreign matter outlet is located between the material inlet and the material outlet; the material flows from the outlet of the feeding bin 1 into the feed end of the belt conveyor 2, and is then transported to the feed port of the rolling screen 3 by the discharge end of the belt conveyor 2, and is transported to the quantitative belt scale 4 by the discharge port of the rolling screen 3; foreign matter is discharged from the foreign matter outlet of the rolling screen 3.

[0016] In this utility model, a rolling screen 3 screens foreign matter from the raw lithium ore and discharges it from the screen's foreign matter outlet. This outlet can then be collected in a foreign matter bag or bin. By screening foreign matter at the beginning of the lithium ore pretreatment system workflow, it prevents it from entering subsequent processes, ensuring the proper operation of the entire production line. The belt conveyor 1 (2) transports material from the lower hopper 1 to the higher rolling screen 3, eliminating the issue of limited excavator bucket lift height.

[0017] Because freshly mined lithium ore has a high moisture content, rolling screen 3 can cause problems such as sticking to the ore during screening. To overcome these issues, the present invention provides a smoke inlet at the bottom of rolling screen 3 near the discharge port, and a smoke exhaust port at the top near the feed port. The smoke inlet of rolling screen 3 is connected to the smoke outlet of roasting kiln 8 via smoke conveying pipe 10, and the smoke exhaust port of rolling screen 3 is connected to denitration treatment system 9 via smoke conveying pipe 2 11. In this embodiment, the hot flue gas generated by the roasting kiln 8 is introduced into the rolling screen 3 to dry the lithium ore in the rolling screen 3. First, drying reduces the moisture content of the lithium ore, improves the problem of soil and other debris contained in the lithium ore adhering to the rolling screen 3, and is also beneficial to improving the flow ability of the lithium ore in the rolling screen, thereby improving the screening efficiency of the rolling screen 3, and is also beneficial to reducing the ability of the motor to drive the rolling screen 3; secondly, the energy used to dry the lithium ore comes from the roasting exhaust gas of the roasting kiln 8, and there is no need to set up a separate heating heat source, which reduces equipment costs and energy waste.

[0018] Since the main function of the rolling screen 3 is screening, the lithium ore circulates in the rolling screen 3 for a short time, which is not enough to meet the drying requirements. In order to further dry the lithium ore and remove moisture from the lithium ore to facilitate the smooth transportation of the subsequent belt conveyor group 7, preferably, a rotary drum dryer 6 is provided between the quantitative belt scale 4 and the belt conveyor group 7. The material transported by the quantitative belt scale 4 enters the rotary drum dryer 6 and is discharged from the outlet of the rotary drum dryer 6 to the feed end of the belt conveyor group 7.

[0019] If a single-line belt conveyor and rolling screen 3 with commonly used smaller specifications are used, the working efficiency will be low. If the specifications of the belt conveyor and rolling screen 3 are increased, the cost of the equipment will increase significantly. In order to balance cost and work efficiency, the belt conveyor 2, rolling screen 3 and quantitative belt scale 4 are provided in two parallel groups.

[0020] A Y-shaped mixer 5 is installed between the quantitative belt scale 4 and the rotary drum dryer 6. The mixer 5 includes inlet 1, inlet 2, and an outlet. The outlets of the two quantitative belt scales 4 align with the corresponding inlets 1 and 2 of the mixer 5, respectively, and the outlet of the mixer 5 aligns with the inlet of the rotary drum dryer 6. The mixer 5 is used to evenly distribute the materials from the two screening lines into the rotary drum dryer 6 for drying, ensuring smooth operation of both screening lines.

[0021] Providing a separate heat source for the rotary drum dryer 6 increases equipment costs. In the present invention, a flue gas inlet is provided at the bottom of the rear end of the rotary drum dryer 6, and a flue gas outlet is provided at the top of the head. The flue gas outlet of the roasting kiln 8 is connected to the flue gas inlet of the rotary drum dryer 6 via a flue gas conveying conduit 3 12 . The flue gas outlet of the rotary drum dryer 6 is connected to the denitrification treatment system 9 via a flue gas conveying conduit 4 13 . The heat required by the rotary drum dryer 6 is derived from the high-temperature flue gas of the roasting kiln 8 , eliminating the need for a separate heat source, reducing equipment costs and saving energy.

[0022] Corresponding valves can be provided on the flue gas conveying pipe 10 and the flue gas conveying pipe 3 12 respectively, and the flue gas flow rate flowing in the flue gas conveying pipe 10 and the flue gas conveying pipe 3 12 can be controlled by controlling the valves to make the most reasonable use of the flue gas of the roasting kiln 8.

[0023] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various changes and variations. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection of the present invention.

Claims

1. A lithium ore pretreatment system comprising a feed bin (1), a quantitative belt scale (4), a roasting kiln (8), and a belt conveyor unit (7) for conveying materials to the roasting kiln (8); characterized in that: A rolling screen (3) and a belt conveyor (2) are provided between a lower material bin (1) and a quantitative belt scale (4); a material inlet is provided at the top of one end of the rolling screen (3), and a material outlet is provided at the bottom of the other end; a foreign matter outlet is provided at the bottom of the rolling screen (3), and the foreign matter outlet is located between the material inlet and the material outlet; the material flows from the outlet of the lower material bin (1) into the feed end of the belt conveyor (2), and is then transported from the discharge end of the belt conveyor (2) to the feed inlet of the rolling screen (3), and is then transported from the discharge outlet of the rolling screen (3) to the quantitative belt scale (4); the foreign matter is discharged from the foreign matter outlet of the rolling screen (3).

2. The lithium ore pretreatment system according to claim 1, characterized in that: A rotary drum dryer (6) is provided between the quantitative belt scale (4) and the belt conveyor unit (7). The material conveyed by the quantitative belt scale (4) enters the rotary drum dryer (6) and is discharged from the outlet of the rotary drum dryer (6) to the feed end of the belt conveyor unit (7).

3. The lithium ore pretreatment system according to claim 2, wherein: The belt conveyor (2), the rolling screen (3) and the quantitative belt scale (4) are provided in two parallel groups.

4. The lithium ore pretreatment system according to claim 3, wherein: A Y-shaped mixer (5) is provided between the quantitative belt scale (4) and the rotary drum dryer (6), and the mixer (5) comprises an inlet 1, an inlet 2 and an outlet; the outlets of the two quantitative belt scales (4) are aligned with the corresponding inlet 1 and inlet 2 of the mixer (5), respectively, and the outlet of the mixer (5) is aligned with the inlet of the rotary drum dryer (6).

5. The lithium ore pretreatment system according to claim 2, 3 or 4, characterized in that: The bottom end of the tail of the rotary drum dryer (6) is provided with a smoke inlet, and the top end of the head is provided with a smoke outlet; the smoke outlet of the roasting kiln (8) and the smoke inlet of the rotary drum dryer (6) are connected through a smoke conveying pipe 1 (10); the smoke outlet of the rotary drum dryer (6) and the denitrification treatment system (9) are connected through a smoke conveying pipe 2 (11).

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