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CN-117587230-B - Separation device for lithium-containing leaching solution

CN117587230BCN 117587230 BCN117587230 BCN 117587230BCN-117587230-B

Abstract

The invention discloses a separation device for lithium-containing leaching solution, which relates to the technical field of lithium mica lithium extraction and comprises a column body, wherein the column body comprises an electrolysis section and a separation section, a first cavity is formed by enclosing an anode column of the electrolysis section and a first anionic membrane, a second cavity is formed by enclosing the first anionic membrane and a cathode plate, a third cavity is formed by enclosing the cathode column of the separation section and the second anionic membrane, a fourth cavity is formed by enclosing the second anionic membrane and the anode plate, a liquid outlet communicated with the third cavity is formed in the separation section, an insulating layer is coated on the outer surfaces of the cathode column and an anode plate, the first cavity is communicated with the third cavity, and the second cavity is communicated with the fourth cavity. The separation device for the lithium-containing leaching solution can separate sulfate radical and chloride radical anions from the leaching solution, wherein chlorine escapes in a gas form, and the leaching solution after separating the chloride ions flows out in a sulfate form, so that the chloride ions in the leaching solution are removed, and the requirement on subsequent process equipment is reduced.

Inventors

  • PU JIAN
  • LAI HUASHENG
  • LIU WENWEN
  • WEN XIAOQIANG
  • WANG YUXIANG
  • HUANG YEDIAN
  • Min Dingwei
  • XIE MAOLIANG
  • ZHOU XINHUA

Assignees

  • 赣州有色冶金研究所有限公司

Dates

Publication Date
20260505
Application Date
20231128

Claims (9)

  1. 1. The separation device of the lithium-containing leaching solution is characterized by comprising a column body (10), wherein the column body (10) comprises an electrolysis section (11) and a separation section (12) which are sequentially arranged along the axial direction; The electrolysis section (11) comprises an anode column (111), a first anion membrane (112), a cathode plate (113) and an electrolysis shell (114) which are sequentially arranged from the axis outwards, a first cavity (115) is formed between the anode column (111) and the first anion membrane (112), a second cavity (116) is formed between the first anion membrane (112) and the cathode plate (113), and a liquid inlet (117) which is communicated with the second cavity (116) is formed in the electrolysis section (11); The separation section (12) comprises a cathode column (121), a second anion membrane (122), an anode plate (123) and a separation shell (124) which are sequentially arranged from the axis outwards, a third cavity (125) is formed between the cathode column (121) and the second anion membrane (122), a fourth cavity (126) is formed between the second anion membrane (122) and the anode plate (123), a liquid outlet (127) which is communicated with the third cavity (125) is formed in the separation section (12), an insulating layer is coated on the outer surfaces of the cathode column (121) and the anode plate (123), the first cavity (115) is communicated with the third cavity (125), and the second cavity (116) is communicated with the fourth cavity (126); The leachate enters the second cavity (116) from the liquid inlet (117), chloride ions and sulfate ions penetrate through the first anion membrane (112) to enter the first cavity (115) under the action of an electric field, cations cannot penetrate through the first anion membrane (112), the leachate containing sulfate and hydroxide anions enters the third cavity (125) of the separation section (12), the leachate containing cations enters the fourth cavity (126) of the separation section (12), anions in the third cavity (125) move to the anode plate (123) through the second anion membrane (122) under the action of the electric field to enter the fourth cavity (126), and the cations are combined with sulfate ions in the leachate in the fourth cavity (126) to form sulfate.
  2. 2. The separation device of the lithium-containing leaching solution according to claim 1, wherein a first air outlet (118) and a second air outlet (119) are arranged at one end of the electrolysis section (11) facing away from the separation section (12), the first air outlet (118) is communicated with the first cavity (115), and the second air outlet (119) is communicated with the second cavity (116).
  3. 3. The separation device of the lithium-containing leaching solution according to claim 2, wherein a first fixing block (13) is arranged at one end of the electrolysis section (11) away from the separation section (12), the first fixing block (13) is detachably connected with the anode column (111), the first anion membrane (112), the cathode plate (113) and the electrolysis shell (114), and the first air outlet (118) and the second air outlet (119) are arranged on the first fixing block (13).
  4. 4. The separation device of the lithium-containing leaching solution according to claim 1, wherein a second fixing block (14) is arranged at one end of the separation section (12) away from the electrolysis section (11), the second fixing block (14) is detachably connected with the cathode column (121), the second anion membrane (122), the anode plate (123) and the separation shell (124), and the liquid outlet (127) is arranged on the second fixing block (14).
  5. 5. The separation device of the lithium-containing leaching solution according to claim 1, wherein a fifth cavity (128) is formed between the separation shell (124) and the anode plate (123), micropores which can be communicated with the fourth cavity (126) and the fifth cavity (128) are formed in the anode plate (123), and a discharge port (129) which is communicated with the fourth cavity (126) is formed in the side end, away from the electrolysis section (11), of the separation shell (124).
  6. 6. The separation device of the lithium-containing leaching solution according to claim 5, wherein a sixth cavity (120) is enclosed between the electrolytic shell (114) and the cathode plate (113), micropores capable of communicating the second cavity (116) with the sixth cavity (120) are arranged on the cathode plate (113), and the sixth cavity (120) is communicated with the fifth cavity (128).
  7. 7. The separation device of the lithium-containing leaching solution according to claim 6, wherein a third fixed block (15) is arranged between the electrolysis section (11) and the separation section (12), one end of the third fixed block (15) is detachably connected with the anode column (111), the first anion membrane (112), the cathode plate (113) and the electrolysis shell (114), the other end of the third fixed block is detachably connected with the cathode column (121), the second anion membrane (122), the anode plate (123) and the separation shell (124), a first flow channel (151), a second flow channel (152) and a third flow channel (153) are arranged on the third fixed block (15), the first flow channel (151) is communicated with the first cavity (115) and the third cavity (125), the second flow channel (152) is communicated with the second cavity (116) and the fourth cavity (126), and the third flow channel (153) is communicated with the sixth cavity (120) and the fifth cavity (128).
  8. 8. The separation device for lithium-containing leaching solution according to claim 1, wherein the first anionic membrane (112), the cathode plate (113), the second anionic membrane (122) and the anode plate (123) are each provided in a ring shape in cross section.
  9. 9. The separation device of the lithium-containing leaching solution according to claim 5, wherein the liquid inlet (117), the liquid outlet (127) and the liquid outlet (129) are respectively provided with a regulating valve (16).

Description

Separation device for lithium-containing leaching solution Technical Field The invention relates to the technical field of lithium extraction from lepidolite, in particular to a separation device for lithium-containing leaching solution. Background There are tens of methods for producing lithium salts from solid minerals, which are basically roasting enriched ore together with various bases, salts or their mixtures, and then further treating the roasted product by different methods to produce lithium, rubidium and cesium salts. In order to efficiently utilize lithium, rubidium and cesium in lepidolite, a chloridizing-sulfate method is generally used for mixing and roasting, and lithium, rubidium and cesium in lepidolite are comprehensively utilized, but because sulfate and chloride are introduced, the obtained leaching solution contains sulfate anions and chloride anions, and the existence of the chloride ions is very severe for subsequent process equipment, so that a device capable of separating the two anions from the leaching solution is needed. Disclosure of Invention The invention aims to provide a separation device for a lithium-containing leaching solution, which solves the problems in the prior art, can separate sulfate radical and chloride radical anions from the leaching solution, and reduces the requirements on subsequent process equipment. In order to achieve the above object, the present invention provides the following solutions: The invention provides a separation device for a lithium-containing leaching solution, which comprises a column body, wherein the column body comprises an electrolysis section and a separation section which are sequentially arranged along the axial direction, the electrolysis section comprises an anode column, a first anionic membrane, a cathode plate and an electrolysis shell which are sequentially arranged from the axial direction outwards, a first cavity is formed between the anode column and the first anionic membrane in a surrounding manner, a second cavity is formed between the first anionic membrane and the cathode plate in a surrounding manner, a liquid inlet communicated with the second cavity is formed in the electrolysis section, the separation section comprises a cathode column, a second anionic membrane, an anode plate and a separation shell which are sequentially arranged from the axial direction outwards, a third cavity is formed between the cathode column and the second anionic membrane in a surrounding manner, a liquid outlet communicated with the third cavity is formed between the second anionic membrane and the anode plate in a surrounding manner, an insulating layer is coated on the outer surface of the cathode column and the anode plate in a surrounding manner, the first cavity is communicated with the third cavity, and the second cavity is communicated with the fourth cavity in a surrounding manner. Preferably, a first air outlet and a second air outlet are formed in one end, away from the separation section, of the electrolysis section, the first air outlet is communicated with the first cavity, and the second air outlet is communicated with the second cavity. Preferably, one end of the electrolysis section, which is away from the separation section, is provided with a first fixing block, and the first fixing block is detachably connected with the anode column, the first anion membrane, the cathode plate and the electrolysis shell, and the first fixing block is provided with a first air outlet and a second air outlet. Preferably, one end of the separation section, which is away from the electrolysis section, is provided with a second fixing block, the second fixing block is detachably connected with the cathode column, the second anion membrane, the anode plate and the separation shell, and the second fixing block is provided with the liquid outlet. Preferably, a fifth cavity is formed between the separation shell and the anode plate in a surrounding mode, micropores capable of being communicated with the fourth cavity and the fifth cavity are formed in the anode plate, and a discharge hole communicated with the fourth cavity is formed in the side end, away from the electrolysis section, of the separation shell. Preferably, a sixth cavity is enclosed between the electrolytic shell and the cathode plate, micropores capable of communicating the second cavity with the sixth cavity are formed in the cathode plate, and the sixth cavity is communicated with the fifth cavity. Preferably, a third fixing block is arranged between the electrolysis section and the separation section, one end of the third fixing block is detachably connected with the anode column, the first anion membrane, the cathode plate and the electrolysis shell, the other end of the third fixing block is detachably connected with the cathode column, the second anion membrane, the anode plate and the separation shell, a first flow passage, a second flow passage and a third flow passage