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Lithium recovery and purification

A technology for recovering lithium and lithium sulfate, applied in the field of recovery and purification of metal substances

Inactive Publication Date: 2021-11-19
XPS EXPERT PROCESS SOLUTIONS GLENCORE CANADA CORP +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Disadvantages include issues such as efficiency, level of purity achieved, scale and cost

Method used

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  • Lithium recovery and purification
  • Lithium recovery and purification
  • Lithium recovery and purification

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Experimental program
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preparation example Construction

[0120] Including Li 2 SO 4 Preparation of the aqueous solution

[0121] In an embodiment, the process further comprises using sulfuric acid (H 2 SO 4 ) to process mixtures including metals to prepare Li 2 SO 4 aqueous solution (for example, by sulfuric acid leaching). In embodiments, the metal-comprising mixture includes metal species other than lithium species, and recovering lithium species from such a mixture comprises obtaining a lithium-enriched species and having a reduced amount of metal species other than lithium species relative to the starting mixture preparations. In embodiments, such metal species other than lithium include one or more Group I metals (other than lithium), Group II metals, transition metals, and / or late transition metals. In embodiments, such metals other than lithium include one or more of calcium, sodium, magnesium, potassium, aluminum, and iron.

[0122] In an example, including Li 2 SO 4 The aqueous solution has a pH of about 4.0 or le...

example 1

[0173] Example 1: Lithium Purification Procedure - Direct Lithium Hydroxide Test 1

[0174] The following stages 1-5 describe the preparation of a model synthetic solution of a mixture of metal sulfates and the subsequent addition of LiOH·H 2 Li is recovered in the form of O. The analysis and results of the samples are shown in Table 1.

[0175] stage 1 - Preparation of synthesis solution

[0176] 1. The following substances are combined in a 2L extraction kettle:

[0177] a.500mL deionized water

[0178] b.50.7g Li 2 SO 4 ·H 2 o

[0179] c. 680 mg of CaSO 4 (anhydrous)

[0180] d.725 mg of Na 2 SO 4 (anhydrous)

[0181] e. 200mg of MgSO 4 (anhydrous)

[0182] f.1450mg of K 2 SO 4

[0183] 2. Mix at a speed of 350rpm to 400rpm at 25°C.

[0184] 3. Take a sample of the solution for chemical analysis and verify that all solids have dissolved.

[0185] stage 2 - Sulfate removal 1

[0186] 4. At room temperature, add solid Ca(OH) 2 to raise the pH of the...

example 2

[0235] Example 2: LiOH·H from a lithium sulfate solution with 5g / L lithium 2 O crystallization

[0236] This test investigates LiOH·H from Li2SO4 solution with 5 g / L 2 O crystallization. The initial pH of the lithium solution was adjusted to 2 using sulfuric acid. figure 1 An overview of sulfate and crystalline LiOH·H 2 The main steps involved in the precipitation of O. The experiments and results are shown in Table 2.

[0237] Table 2: Experimental conditions and results

[0238]

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PUM

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Abstract

Processes for the recovery or purification of lithium species from various sources are described. Such sources include natural sources or deposits, such as in mining applications, and synthetic or non-natural sources, such as in the recycling of lithium species from batteries. In embodiments, the process comprises treating a Li2SO4-comprising aqueous solution with one or more barium salts to form a precipitate comprising barium sulfate (BaSO4). In embodiments, the processes may further comprise the preparation of a lithium sulfate-containing solution via treatment of the starting material or mixture with sulfuric acid. In embodiments, further treatments may be performed, for example prior to and / or subsequent to treatment with one or more barium salts, for example for initial or further sulfate removal, and / or removal of other metal species that may be present. The recovered lithium species be used directly, or converted into other forms, for use in a variety of applications.

Description

[0001] Cross References to Related Applications [0002] This application claims priority to U.S. Provisional Application Serial No. 62 / 778,530, filed December 12, 2018, the entire contents of which are hereby incorporated by reference. technical field [0003] The present disclosure relates to the recovery and purification of metallic species. More specifically, the present disclosure relates to the recovery or purification of lithium (Li) species from various sources. Background technique [0004] Demand for lithium metal has grown exponentially over the years as it is used in various materials including ceramic glasses, binders, lubricants, metal alloys, and especially as electrode material for lithium-ion batteries. Lithium occurs in several natural resources, including ores, clays, brines and seawater, and can be extracted from them. Also, recovery of lithium from recycled battery electrode materials is becoming increasingly important. Processes for lithium extractio...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B3/44C01D15/00C01D15/06C01F1/00H01M10/54C01F11/46C22B26/12
CPCC01D15/06C22B3/44C22B26/12H01M10/54Y02W30/84Y02P10/20C01D15/02C01F11/462C01F11/46C22B7/007Y02E60/10C01F1/00H01M4/405H01M10/0525
Inventor A·盖尔曼G·古道尔R·潘德尔
Owner XPS EXPERT PROCESS SOLUTIONS GLENCORE CANADA CORP