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CN-121972118-A - Device for preparing battery-grade lithium carbonate by continuously precipitating lithium

CN121972118ACN 121972118 ACN121972118 ACN 121972118ACN-121972118-A

Abstract

The invention relates to the technical field of lithium carbonate preparation and discloses a device for preparing battery-grade lithium carbonate by continuously depositing lithium, which comprises a bracket, wherein two sets of mutually independent and alternately operated reaction devices are symmetrically arranged on the bracket, each reaction device comprises two reaction kettles which are symmetrically arranged front and back, and a first feed pipe for conveying lithium sulfate solution and a second feed pipe for conveying sodium carbonate solution are symmetrically arranged on the upper end of each reaction kettle. The device for preparing the battery-grade lithium carbonate by continuously depositing lithium can effectively solve the problems that in the prior art, the traditional intermittent lithium deposition kettle needs to repeatedly discharge, clean, feed and other processes after each production is finished, the production efficiency is low and the productivity is restricted, the uniformity of feeding is difficult to control, the sulfate radical coating is easy to exceed standard, the rate control precision is poor, peritectic is easy to cause the sodium content to exceed standard, and finally the primary qualification rate of the battery-grade lithium carbonate is low.

Inventors

  • XU BO
  • WANG LIZHONG
  • Tang shangfeng
  • PENG HUIQIANG

Assignees

  • 湖南永杉锂业有限公司

Dates

Publication Date
20260505
Application Date
20251229

Claims (8)

  1. 1. A device for preparing battery grade lithium carbonate by continuous lithium precipitation, which is characterized by comprising: The device comprises a bracket (1), wherein two sets of reaction devices (2) which are arranged on the bracket (1) in a bilateral symmetry way and are mutually independent and alternately run; The reaction device (2) comprises two reaction kettles (21) which are symmetrically arranged front and back, a first feeding pipe (211) for conveying lithium sulfate solution and a second feeding pipe (212) for conveying sodium carbonate solution are symmetrically arranged at the left and right of the upper end of the reaction kettles (21), a discharging pipe (22) is arranged at the center of the lower end of the reaction kettles (21), and a stirring assembly (23) for fully mixing the lithium sulfate solution and the sodium carbonate solution is arranged in the reaction kettles (21); The device comprises a reaction kettle (21), a first liquid inlet pipe (211) and a second liquid inlet pipe (212), wherein the first liquid inlet pipe and the second liquid inlet pipe are respectively connected with a liquid inlet pipe (24) through flanges, an opening and closing assembly (25) is arranged in the liquid inlet pipe (24), the lower end of the first liquid inlet pipe (211) extends into the reaction kettle (21) and is connected with a dispersing assembly (26) for uniformly dispersing lithium sulfate solution into the reaction kettle (21); wherein, a filter component (27) for preventing blockage is arranged in the discharging pipe (22).
  2. 2. The device for preparing the battery grade lithium carbonate by continuously precipitating lithium according to claim 1, wherein the dispersing component (26) comprises a plurality of annular pipes (261) which are arranged in a concentric nested manner and have uniform diameters, the adjacent annular pipes (261) are communicated through flanges, and the outermost annular pipe (261) is communicated with the first feeding pipe (211) and fixedly connected with the inner side wall of the reaction kettle (21) through a short rod (262).
  3. 3. The device for preparing battery grade lithium carbonate by continuous lithium precipitation according to claim 2, wherein micropores (263) are uniformly and thoroughly formed at the lower position of the peripheral wall of the ring pipe (261).
  4. 4. The device for preparing battery-grade lithium carbonate by continuous lithium precipitation according to claim 1, wherein the stirring assembly (23) comprises a stirring shaft (231) which is rotatably arranged on the reaction kettle (21) and driven by a driving motor, a plurality of spiral plates (232) are uniformly sleeved on the stirring shaft (231) in a vertically fixed manner, and stirring blades (233) are fixedly sleeved on the stirring shaft (231) between two adjacent spiral plates (232).
  5. 5. The device for preparing battery grade lithium carbonate by continuous lithium precipitation according to claim 4, wherein the filter assembly (27) comprises a filter plate (271), the filter plate (271) is fixedly connected inside the discharge pipe (22) and is rotationally connected with the stirring shaft (231), and a cleaning module (272) for preventing large particulate matters from accumulating on the filter plate (271) is connected to the filter plate (271).
  6. 6. The device for preparing battery-grade lithium carbonate by continuous lithium precipitation according to claim 5, wherein the cleaning module (272) comprises a vortex plate (2721), the vortex plate (2721) is arranged above the filter plate (271) and fixedly connected with the stirring shaft (231), and a baffle seat (2722) is fixedly connected with the inner peripheral wall of the discharging pipe (22).
  7. 7. The device for preparing battery-grade lithium carbonate by continuous lithium precipitation according to claim 6, wherein the baffle seat (2722) is annular, a chamfer is formed on one side, close to the center, of the upper end of the baffle seat, and an elliptical groove (2723) is formed in the lower end of the baffle seat (2722).
  8. 8. The device for preparing the battery-grade lithium carbonate by continuously depositing lithium according to claim 1, wherein the opening and closing assembly (25) comprises a center rod (251) controlled by a servo motor, the center rod (251) is coaxially arranged in the liquid inlet pipe (24), annular seats (252) corresponding to the flanges on the liquid inlet pipe (24) are symmetrically and fixedly connected to the center rod (251) through connecting plates, the annular seats (252) are rotationally connected with the liquid inlet pipe (24), through grooves (2521) are formed in the peripheral wall of the annular seats (252) in a penetrating mode, and the through grooves (2521) on the two annular seats (252) in the same liquid inlet pipe (24) are arranged in a staggered mode.

Description

Device for preparing battery-grade lithium carbonate by continuously precipitating lithium Technical Field The invention relates to the technical field of lithium carbonate preparation, in particular to a device for preparing battery-grade lithium carbonate by continuously precipitating lithium. Background The lithium precipitation process is a key link in the lithium carbonate production process, and the process rationality directly determines the production efficiency and the product quality. At present, the lithium precipitation process in the industry has a certain problem in the production period that repeated operations such as discharging, cleaning, feeding and the like need to be carried out in sequence after a single-batch reaction is completed by the lithium precipitation kettle, and the industry generally adopts an intermittent production mode, wherein the mode has obvious short plates, the production efficiency is low, the time and the labor are wasted, and the productivity is restricted from being improved. In order to break the bottleneck and improve the production efficiency and the product quality, a plurality of continuous lithium deposition reaction kettles have been developed in the industry. However, from the practical application effect, the equipment still has obvious defects in the lithium sulfate solution charging link that firstly, the charging uniformity is insufficient, lithium carbonate crystals are easy to coat lithium sulfate, so that the sulfate radical content in the product exceeds the standard, and secondly, the charging rate control precision is deficient, the peritectic phenomenon is easy to be caused, so that the sodium content of the product exceeds the standard requirement. The problems directly lead to low primary qualification rate of the battery-grade lithium carbonate, and are difficult to meet the severe index requirements of the downstream industry on battery-grade raw materials. Disclosure of Invention Aiming at the defects existing in the prior art, the invention provides a device for preparing battery-grade lithium carbonate by continuously depositing lithium, which can effectively solve the problems that in the prior art, the traditional intermittent lithium deposition kettle needs to repeatedly discharge, clean, feed and other processes after each production is finished, the production efficiency is low and the productivity is restricted, the uniformity of feeding is difficult to control by a continuous reaction kettle, sulfate radical coating is easy to exceed standard, peritectic caused by poor rate control precision is easy to cause sodium content to exceed standard, and finally, the primary qualification rate of battery-grade lithium carbonate is low and the severe requirement on the downstream is difficult to meet. In order to achieve the above purpose, the invention is realized by the following technical scheme: the invention provides a device for preparing battery-grade lithium carbonate by continuously precipitating lithium, which comprises: the device comprises a bracket, wherein two sets of reaction devices which are arranged on the bracket in a bilateral symmetry manner and are mutually independent and alternately operated; The reaction device comprises two reaction kettles which are symmetrically arranged front and back, a first feeding pipe for conveying lithium sulfate solution and a second feeding pipe for conveying sodium carbonate solution are symmetrically arranged at the left and right of the upper end of the reaction kettles, a discharging pipe is arranged at the center of the lower end of the reaction kettles, and stirring assemblies for fully mixing the lithium sulfate solution and the sodium carbonate solution are arranged in the reaction kettles; Wherein the two feed pipes I corresponding to the front and the back and the two feed pipes II corresponding to the front and the back are respectively and jointly connected with a liquid inlet pipe through flanges, an opening and closing assembly is arranged in the liquid inlet pipe, and the lower end of the first feeding pipe extends to the inside of the reaction kettle and is connected with a dispersing assembly for uniformly dispersing the lithium sulfate solution into the reaction kettle; Wherein, be provided with the filter component who prevents the jam in the discharging pipe. Further, the dispersion assembly comprises a plurality of annular pipes which are arranged in a concentric nested mode and have uniform diameters, the adjacent annular pipes are communicated through flanges, and the outermost annular pipe is communicated with the first feed pipe and is fixedly connected with the inner side wall of the reaction kettle through a short rod. Further, micropores are uniformly formed in the lower position of the circumferential wall of the ring pipe in a penetrating manner. Further, the stirring assembly comprises a stirring shaft which is rotatably arranged on the reaction kettle and