Method for preparing ammonium alum from sulfuric acid method lithium extraction leaching solution

A technology of leachate and sulfuric acid method, applied in aluminum sulfate, chemical instruments and methods, aluminum sulfur compounds, etc., can solve the problems that aluminum ions cannot be effectively comprehensively recycled, large losses, and high aluminum ion content, and improve the comprehensive recovery of aluminum ions. The effect of utilization and improvement of lithium recovery rate

Pending Publication Date: 2020-08-25
贵州锂电新能源科技有限公司 +1
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Problems solved by technology

[0005] The technical problem to be solved in the present invention is: provide a kind of method that sulfuric acid method extracts lithium leaching liquid to prepare ammonium alum, to solve sulfuric acid method extracting lithium leaching liquid, aluminum ion content is high, adopt neutralization hydrolysis precipitation method to remove aluminum, aluminum forms Al(OH ) 3 The colloid has an adsorption effect on lithium ions, resulting in a large loss of lithium in the sedimentation residue, and the need to use a large amount of precipitant, the problem that aluminum ions cannot be effectively comprehensively recycled

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  • Method for preparing ammonium alum from sulfuric acid method lithium extraction leaching solution

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specific Embodiment approach 2

[0033] The raw ore is a lepidolite resource in Henan, and the main valuable elements in the raw ore sample are lithium, Li 2 The O content is 6.39%. The main minerals are lepidolite, feldspar, pyrite and quartz. The chemical analysis of the main elements of the ore is shown in Table 3.

[0034] Table 3 Results of multi-element analysis of raw ore

[0035] element / % Li 2 o

SiO 2

K 2 o

Na 2 o

MnO 2

content 6.39 56.56 7.54 0.21 0.20 element al 2 o 3

Fe 2 o 3

CaO MgO P 2 o 5

content / % 25.32 0.04 0.97 0.079 0.11

[0036] Process flow chart see figure 1 As shown, the steps are as follows:

[0037] (1) Sulfuric acid method is filtered to obtain the leachate;

[0038] (2) Add ammonia water with a concentration of 20%-25% to the leachate, and stir to adjust the pH to 2.64;

[0039] (3) Let the leaching solution stand at room temperature for 36 hours to crystallize, and filter with sucti...

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Abstract

The invention discloses a method for preparing ammonium alum from a sulfuric acid method lithium extraction leaching solution. According to the method, mixed ammonia water after suction filtration issubjected to standing crystallization, and crystals are dissolved in distilled water for recrystallization. The ammonium alum product meeting the parameter requirements of the GB25592-2010 food additive aluminum ammonium sulfate is obtained. The leaching method is low in energy consumption, simple in process and low in production cost, aluminum ions are effectively recovered, subsequent precipitation operation is facilitated, and the recovery rate of subsequent products is increased.

Description

technical field [0001] The invention relates to a method for preparing ammonium alum from lithium extraction leachate by sulfuric acid method, and belongs to the field of hydrometallurgy and chemical industry. Background technique [0002] Ammonium alum has a wide range of uses, not only for industrial water purification, paper sizing, but also for food loosening, glass coloring, leather industry, and dye industry; it is used in medicine as an astringent, and in industry as polyaluminum The source of the starting material for the compound. Therefore, the industrial value of ammonium alum is higher, and the market demand is larger. [0003] The sulfuric acid method is the main lithium extraction method at present. The natural α-spodumene is transformed and roasted at 950-1100°C, and the sulfuric acid and β-spodumene are acidified, roasted and leached. Add 70% sulfuric acid solution to lepidolite, the liquid-solid ratio is 2:1, fully react at 120°C for 9 hours, leaching for ...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F7/76A23L29/00
CPCC01F7/765A23L29/015C01P2006/80C01P2006/82
Inventor 黄苑龄张海邓强杨光龙张周位张文兴
Owner 贵州锂电新能源科技有限公司
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