Unlock instant, AI-driven research and patent intelligence for your innovation.

Bipolar membrane device suitable for preparing lithium hydroxide from lithium carbonate as raw material

A lithium hydroxide and bipolar membrane technology, applied in the field of membrane separation, can solve the problems of difficult normal industrial application of patents, high energy consumption in the bipolar membrane process, low solubility of lithium carbonate, etc., to increase current efficiency and production capacity. , The effect of improving processing capacity and reducing equipment investment costs

Pending Publication Date: 2019-07-12
宜宾雅摩尔服饰制造有限公司
View PDF11 Cites 3 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0012] Although these patents use lithium carbonate as a raw material to prepare lithium hydroxide by bipolar membrane, but because the solubility of lithium carbonate is too small (less than 1.5%), the bipolar membrane process consumes too much energy and the current is too high. Small, too much membrane area causes too much investment
[0013] Above these shortcoming all make these patents be difficult to normal industrialization application

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Bipolar membrane device suitable for preparing lithium hydroxide from lithium carbonate as raw material
  • Bipolar membrane device suitable for preparing lithium hydroxide from lithium carbonate as raw material
  • Bipolar membrane device suitable for preparing lithium hydroxide from lithium carbonate as raw material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0052] according to figure 1 , figure 2 , image 3 As shown, a set of bipolar membrane device for preparing lithium hydroxide is installed, including a pretreatment unit, an electrodialysis concentration unit, a bipolar membrane unit, and a monopolyvalent acid separation electrodialysis unit. There are anolyte inlet 1, cathode terminal 13, anolyte outlet 16, and catholyte outlet 17; an anolyte channel plate 8 is placed on the inner side near the clamping plate 10, and a platinum anolyte channel plate is placed on the inner side of the anolyte channel plate 8. The tantalum-iridium electrode 15, starting from the platinum-tantalum-iridium electrode 15, is sequentially placed inwardly with a bipolar membrane 2 with a lithium interception rate greater than 98%, a special anodic membrane 3 resistant to strong alkalis, and a dedicated negative membrane 4 resistant to strong acids It is a group of membrane groups; on the two anolyte flow channel plates 8, there are respectively an...

Embodiment 2

[0059] according to figure 1 , figure 2 , image 3 As shown, a set of bipolar membrane device for preparing lithium hydroxide is installed with a structure similar to that of the embodiment, including a pretreatment unit, an electrodialysis concentration unit, a bipolar membrane unit, and a monopolyvalent acid separation electrodialysis unit. In the bipolar membrane device, the lithium rejection rate of bipolar membrane components is greater than 98%. : 30:8, and then use the impregnation method to prepare the bipolar membrane. The positive layer is carboxylated with glacial acetic acid, and the negative side is chloroethylated with chloroethyl ether instead of ordinary chloromethyl ether, and then replaced with m-phenylenediamine. Ordinary trimethylamine is quaternized to form a bipolar membrane 2 with a rejection rate of more than 98% for lithium. The controlled membrane resistance is 5Ω / cm2, the degree of crosslinking is 75%, and the membrane thickness is 0.12mm. A tota...

Embodiment 3

[0065] according to figure 1 , figure 2 , image 3As shown, a set of bipolar membrane device for preparing lithium hydroxide is installed with a structure similar to that of the embodiment, including a pretreatment unit, an electrodialysis concentration unit, a bipolar membrane unit, and a monopolyvalent acid separation electrodialysis unit. In the bipolar membrane device, the lithium rejection rate of the bipolar membrane component is greater than 98%. The bipolar membrane 2 is a bottom membrane made of polyethylene and polybutadiene with a thickness of 0.15 mm and graphene, and the ratio of the three is 100. : 40:9, and then use the impregnation method to prepare the bipolar membrane. The positive layer is carboxylated with glacial acetic acid, and the negative side is chloroethylated with chloroethyl ether instead of ordinary chloromethyl ether, and then replaced with m-phenylenediamine Ordinary trimethylamine is quaternized to form a bipolar membrane 2 with a rejection ...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
thicknessaaaaaaaaaa
thicknessaaaaaaaaaa
thicknessaaaaaaaaaa
Login to View More

Abstract

The invention discloses a bipolar membrane device suitable for preparing lithium hydroxide from lithium carbonate as a raw material with a bipolar membrane method. The device comprises an anode liquidinlet, a cathode binding post, an anode liquid outlet and a cathode liquid outlet. The device is characterized in that polar liquid flow channel plates are arranged on the inner sides close to clamping plates, platinum-tantalum-iridium electrodes are arranged on the inner sides of the polar liquid flow channel plates, bipolar membranes with lithium retention rate being higher than 98% are sequentially arranged inward from the platinum-tantalum-iridium electrodes, and one alkali-resistant positive membrane and one acid-resistant negative membrane constitute one membrane group; an anolyte inletand an anolyte outlet as well as a catholyte inlet and a catholyte outlet are formed in the polar liquid flow channel plates respectively; a feed liquid inlet, a lithium hydroxide outlet, a concentrated acid inlet and a concentrated acid outlet are formed in the two clamping plates respectively and communicated with the outside. Due to adoption of the newly developed bipolar membranes with high acid resistance and lithium retention rate higher than 98%, the overall service life of the device is greatly prolonged to 3 years or longer, the yield of lithium hydroxide is increased from original 95%-98% to 98% or higher, and energy consumption for conversion per ton of produced lithium hydroxide monohydrate falls to be 2,000 kilowatt-hours or lower.

Description

technical field [0001] The invention belongs to the technical field of membrane separation, and in particular relates to a bipolar membrane device suitable for preparing lithium hydroxide by using lithium carbonate as a raw material. Background technique [0002] The main raw material for the production of lithium carbonate is salt lake brine (the ore method has a small global production capacity due to the high cost), so large-scale production of lithium carbonate must have the right to exploit salt lake resources with relatively rich lithium resource reserves, which makes the industry have a relatively high resource barriers; on the other hand, since the vast majority of resources in global salt lakes are high-magnesium and low-lithium types, it is very difficult to purify and separate lithium carbonate from high-magnesium and low-lithium old brines. Previously, these technologies were only mastered by a few In the hands of foreign companies, this makes the lithium carbona...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Applications(China)
IPC IPC(8): C25B1/46C25B9/08C25B13/08C25B15/08C25B9/19
CPCC25B1/46C25B13/08C25B15/08C25B9/19
Inventor 易家祥刘爱兵陈昌明
Owner 宜宾雅摩尔服饰制造有限公司