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CN-224207612-U - System for improve lithium recovery rate

CN224207612UCN 224207612 UCN224207612 UCN 224207612UCN-224207612-U

Abstract

The utility model relates to a system for improving lithium recovery rate, which comprises a pulping device (1), a purifying and separating device (2), a causticizing device (3) and a slag washing device (4), wherein the pulping device (1) is respectively connected with a mineral sample conveying device from outside the system and a calcium carbonate conveying device, an outlet of the pulping device (1) is connected with the purifying and separating device (2), a causticizing liquid discharge port on the causticizing device (3) is connected with the purifying and separating device (2), a causticizing raw slag discharge port is connected with the slag washing device (4), and a washing water discharge port on the slag washing device (4) is connected with the causticizing device (3), and a causticizing slag discharge port is connected with the pulping device (1). The system can carry out causticization recovery on the lithium intermediate product, and the causticization liquid return system directly utilizes lithium resources, and the causticization slag returns to the pulping device to replace part of calcium carbonate to recycle pulping acidity on one hand, and recycle the residual lithium resources in the causticization slag on the other hand, so that the overall recovery rate of the lithium resources can be improved.

Inventors

  • TANG PENG
  • WANG YAZHOU
  • PENG YANG
  • LIU XIAOPING
  • CHEN JIANG
  • XIANG HUALIN
  • NI YUCHENG
  • HU BING
  • CAI PENGBO
  • ZENG WEI

Assignees

  • 四川天华时代锂能有限公司

Dates

Publication Date
20260508
Application Date
20250604

Claims (10)

  1. 1. A system for improving lithium recovery rate, which is characterized by comprising a pulping device (1), a purifying and separating device (2), a causticizing device (3) and a slag washing device (4); The pulping device (1) is respectively connected with the mineral sample conveying device (6) and the calcium carbonate conveying device (8), and an outlet of the pulping device (1) is connected with the purifying and separating device (2); The purifying and separating device (2) is provided with a slag discharge port (9), a finished lithium carbonate discharge port (11) and a crude lithium carbonate discharge port (10), and the crude lithium carbonate discharge port (10) is connected with the causticizing device (3); Lime slurry is contained in the causticizing device (3) and is respectively connected with the purifying and separating device (2) and the slag washing device (4); the slag washing device (4) is connected with the pulping device (1).
  2. 2. The system for improving lithium recovery rate according to claim 1, wherein the pulping device (1) comprises a mineral sample metering device (5), a calcium carbonate metering device (7), a stirring device and a slurry conveying device, wherein the mineral sample metering device (5) and the calcium carbonate metering device (7) are connected with the stirring device, a discharge hole is arranged at the lower part of the stirring device and is connected with the slurry conveying device, and the slurry conveying device is connected with the purifying and separating device (2).
  3. 3. The system for improving lithium recovery rate according to claim 1 or 2, wherein the purification and separation device (2) comprises a filtering system, a impurity removal system, a carbonization system and a centrifugal system, wherein the filtering system is connected with the slurry conveying device, a liquid outlet is arranged on the filtering system and connected with the impurity removal system, the impurity removal system is connected with the carbonization system, the carbonization system is connected with the centrifugal system, and the centrifugal system is provided with a crude lithium carbonate outlet.
  4. 4. A system for improving lithium recovery according to claim 2, characterized in that the mineral sample metering device (5) and the calcium carbonate metering device (7) are connected to the mineral sample conveying device (6) and the calcium carbonate conveying device (8), respectively.
  5. 5. A system for improving lithium recovery rate according to claim 3, characterized in that the causticizing device (3) comprises a lime pulping system, a causticizing reaction system and a causticizing device solid-liquid separation system, wherein the lime pulping system is connected with the causticizing reaction system, and the causticizing reaction system is connected with the causticizing device solid-liquid separation system.
  6. 6. The system for improving the lithium recovery rate according to claim 1 or 5, wherein the slag washing device (4) comprises a washing system and a slag washing device solid-liquid separation system, and the washing system is connected with a causticizing raw slag discharge port arranged on the causticizing reaction system and then connected with the slag washing device solid-liquid separation system.
  7. 7. A system for enhancing lithium recovery as claimed in claim 3, wherein the filtration system is further provided with a filtration system slag outlet, the filtration system slag outlet being in communication with the outside of the system.
  8. 8. A system for increasing lithium recovery according to claim 5, wherein the causticizing reaction system is connected to a crude lithium carbonate discharge port provided on the centrifugal system.
  9. 9. The system for improving lithium recovery rate according to claim 5, wherein the causticizing device solid-liquid separation system is respectively provided with a causticizing liquid discharge port and a causticizing raw slag discharge port, wherein the causticizing liquid discharge port is connected with the purifying and separating device (2), and the causticizing raw slag discharge port is connected with the slag washing device (4).
  10. 10. The system for improving lithium recovery rate according to claim 6, wherein a causticizing slag discharge port and a washing water discharge port are arranged on the solid-liquid separation system of the slag washing device, the causticizing slag discharge port is connected with the calcium carbonate metering device (7), and the washing water discharge port is connected with the lime pulping system.

Description

System for improve lithium recovery rate Technical Field The utility model relates to the technical field of lithium salt production, in particular to a system for improving lithium recovery rate. Background With the vigorous development of the power battery field and the energy storage field, the demand of battery-grade lithium carbonate is high in recent years. Generally, lithium carbonate manufacturers will convert lithium resources in lithium ores into battery-grade lithium carbonate to the greatest extent, wherein development and utilization of trace lithium resources are involved. At present, patent (CN 119524472A) is used for recovering trace lithium resources in mirabilite produced in a sulfate process lithium salt production system, in particular, lithium resources exceeding 90% in mirabilite can be recovered by dissolving and adsorbing the mirabilite, and patent (CN 216459396U) is used for comprehensively recovering lithium, iron, gypsum, aluminum and tantalum-niobium resources after lithium slag is treated by a series of complex beneficiation methods, so that the lithium slag resources are creatively utilized to the greatest extent. The patent uses complex process flow and equipment with huge investment to treat byproducts produced in the lithium salt production process to recycle lithium resources, has good lithium recycling effect, but has large industrial investment and is difficult to put into production. The patent (CN 114105172A) continuously produces battery grade lithium carbonate after lime causticizing crude lithium carbonate produced in the lithium salt production process, but has room for further improving the yield of lithium for not utilizing lithium remained in causticized slag. Therefore, there is a need for further development of lithium recovery to increase the overall recovery of lithium. Disclosure of utility model In order to solve the problems in the background technology, the utility model provides a system for improving the recovery rate of lithium, which can recycle the lithium intermediate product by causticization, and the causticizing liquid return system directly utilizes lithium resources, and the causticizing slag returns to the pulping device to replace part of calcium carbonate to recycle the pulping acidity on one hand, and recycle the residual lithium resources in the causticizing slag on the other hand, so that the overall recovery rate of the lithium resources can be improved. In order to achieve the above object, the present utility model has the following specific technical scheme: a system for improving lithium recovery rate comprises a pulping device, a purifying and separating device, a causticizing device and a slag washing device; The pulping device is respectively connected with a mineral sample conveying device from outside the system and a calcium carbonate conveying device, and an outlet of the pulping device is connected with a purifying and separating device; The purification and separation device is provided with a slag discharge port, a finished product lithium carbonate discharge port and a crude lithium carbonate discharge port, and the crude lithium carbonate discharge port is connected with the causticizing device; the causticizing device contains lime slurry and is respectively connected with the purifying and separating device and the slag washing device; The slag washing device is connected with the pulping device. Further, in the system for improving the lithium recovery rate, the pulping device comprises a mineral sample metering device, a calcium carbonate metering device, a stirring device and a slurry conveying device, wherein the mineral sample metering device and the calcium carbonate metering device are connected with the stirring device, a discharge hole is arranged at the lower part of the stirring device and is connected with the slurry conveying device, and the slurry conveying device is connected with the purifying and separating device. Further, the mineral sample metering device and the calcium carbonate metering device are respectively connected with a mineral sample conveying device and a calcium carbonate conveying device outside the system, and the mineral sample metering device and the calcium carbonate metering device enter the pulping device through the conveying device after being metered. The pulping device mixes the ore sample with calcium carbonate (containing causticized slag) to consume the residual acid in the ore sample uniformly. Further, in the system for improving the lithium recovery rate, the purification and separation device comprises a filtering system, a impurity removing system, a carbonization system and a centrifugal system, wherein the filtering system is connected with the slurry conveying device, a liquid outlet is formed in the filtering system and connected with the impurity removing system, the impurity removing system is connected with the carbonization system, the carbonization system is c