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Lithium slag solid waste resource recycling process

A technology of resource utilization and lithium slag, applied in the direction of inorganic chemistry, alkali metal compounds, chemical instruments and methods, etc., can solve the problems of lithium slag recovery rate and low utilization value, pollution, waste of resources, etc., to improve the comprehensive utilization value , Protect the environment and avoid waste

Pending Publication Date: 2022-07-05
珠海广隆新材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The technical problem to be solved by the present invention is: the recovery rate and utilization value of lithium slag in the prior art are low, resulting in waste of resources and environmental pollution

Method used

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  • Lithium slag solid waste resource recycling process
  • Lithium slag solid waste resource recycling process
  • Lithium slag solid waste resource recycling process

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0053] Embodiment 1: The present embodiment provides a lithium slag solid waste recycling process, which is carried out according to the following steps:

[0054] S1. Acid dissolution and separation: Mix 1t lithium slag with water evenly, so that the lithium slag is completely infiltrated with water, and then add sulfuric acid. The amount of sulfuric acid is 25% of the solid content of the lithium slag, so that the lithium, sodium, potassium, Metal oxides such as rubidium, cesium, magnesium, iron, aluminum, and zinc can be completely dissolved to form acid salts; in this embodiment, sulfuric acid uses a by-product acid with a concentration of 50wt%, and the by-product acid is more expensive than reagent-grade sulfuric acid. Appropriate to reduce recycling costs and improve resource utilization. Specifically, lithium slag undergoes a series of chemical reactions in the mixed solution of water and sulfuric acid, and the representative reactions are as follows:

[0055] Na 2 O+...

Embodiment 2

[0073] Embodiment 2: The present embodiment provides a lithium slag solid waste recycling process, which is carried out according to the following steps:

[0074] S1. Acid dissolution and separation: Mix 1t lithium slag with water evenly, so that the lithium slag is completely infiltrated by water, then add sulfuric acid and hydrofluoric acid, the molar ratio of sulfuric acid and hydrofluoric acid is 1:1, sulfuric acid and hydrofluoric acid The amount used is 25% of the solid content of the lithium slag, so that metal oxides such as lithium, sodium, potassium, rubidium, cesium, magnesium, iron, aluminum, and zinc are completely dissolved in the lithium slag to form acid salts; in this embodiment, sulfuric acid is used The by-product acid with a concentration of 50wt% is more suitable for the price of the by-product acid than the reagent grade sulfuric acid, so as to reduce the recovery cost and improve the resource utilization rate. Specifically, lithium slag undergoes a serie...

Embodiment 3

[0093] Embodiment 3: The present embodiment provides a lithium slag solid waste recycling process, which is carried out according to the following steps:

[0094] S1. Acid dissolution and separation: Mix 1t of lithium slag with water evenly, so that the lithium slag is completely infiltrated by water, and then add hydrofluoric acid. The amount of hydrofluoric acid is 25% of the solid content of the lithium slag, so that the lithium, Metal oxides such as sodium, potassium, rubidium, cesium, magnesium, iron, aluminum, and zinc are completely dissolved to form acid salts; in this embodiment, hydrofluoric acid uses a by-product acid with a concentration of 50 wt%, and the by-product acid is compared with reagents The price of grade hydrofluoric acid is more suitable to reduce the cost of recycling and improve the utilization rate of resources. Specifically, lithium slag undergoes a series of chemical reactions in the mixed solution of water and sulfuric acid, and the representativ...

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Abstract

The invention relates to the technical field of lithium slag solid waste recycling, and discloses a lithium slag solid waste resource recycling process which comprises the following steps: S1, acid dissolution and separation: uniformly mixing lithium slag with water to infiltrate the lithium slag, and adding strong acid or composite acid to dissolve metal oxide in the lithium slag to generate acid salt; hydrolyzing to precipitate insoluble substances, and separating to remove insoluble and insoluble solids; s2, iron element removal: adding liquid caustic soda into the mixed salt solution, stirring, adjusting the pH value to 3-3.5, and centrifugally rinsing iron-containing precipitates to obtain iron mud; s3, aluminum element removal: adding liquid caustic soda into the mixed salt solution, stirring, adjusting to 6-7, completely precipitating aluminum ions, and separating the precipitate to obtain aluminum mud; s4, removal of heavy metal elements: a heavy metal collecting agent is added into the mixed salt solution, so that the heavy metals form insoluble substances, and the insoluble substances are precipitated, separated and removed; and S5, targeted separation: carrying out targeted separation on the residual salt solution to prepare potassium sulfate, sodium sulfate, lithium carbonate, cesium carbonate and rubidium carbonate.

Description

technical field [0001] The invention relates to the technical field of lithium slag solid waste recycling, in particular to a lithium slag solid waste recycling process. Background technique [0002] Lithium slag is the filter residue produced after spodumene or lepidolite is produced by sulfuric acid method to produce lithium carbonate (acid method lithium slag) or by limestone to produce lithium hydroxide (alkaline method lithium slag). [0003] The analysis data of the main components in the lithium slag are shown in Table 1 below: [0004] serial number name content / % serial number name content / % 1 SiO 2 35.45 11 Mn0 0.35 2 Ai 2 0 3 21.84 12 Cs 2 0 0.3 3 CaO 11.3 13 Na 2 O 0.3 4 SO 3 9.4 14 Ti0 2 0.16 5 K 2 0 7.43 15 P 2 0 5 0.14 6 Fe 2 0 3 2.69 16 Y 2 0 3 0.12 7 F 2.52 17 Zn0 0.05 8 Rb 2 0 0.63 18 Nb 2 0 5 0.02 9 M...

Claims

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Application Information

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IPC IPC(8): C01D15/08C01D5/16C01D17/00C22B1/00C22B7/00C22B26/12C22B26/10C22B26/22C22B19/30
CPCC01D15/08C01D17/003C01D5/16C22B1/005C22B7/007C22B26/12C22B26/10C22B26/22C22B21/0023C22B19/30C22B19/22
Inventor 黄彰标
Owner 珠海广隆新材料科技有限公司
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