Method for extracting lithium from amblygonite and preparing iron-containing phosphate

A technology of lepidolite and phosphate, which is applied in the field of metal extraction and separation, can solve the problems of long process route, the extraction rate of lithium extraction needs to be improved, the lack of full utilization of lecithin, iron and phosphorus, etc., and achieves high purity. , the effect of low cost and short process

Active Publication Date: 2018-11-23
SHENZHEN DYNANONIC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0009] Although the above-mentioned methods can realize lithium extraction from lithium phosphoenite, the process route is relatively long, and the extraction rate of lithium extr...

Method used

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  • Method for extracting lithium from amblygonite and preparing iron-containing phosphate
  • Method for extracting lithium from amblygonite and preparing iron-containing phosphate
  • Method for extracting lithium from amblygonite and preparing iron-containing phosphate

Examples

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Embodiment 1

[0081] In this embodiment, lithium is extracted from lithium phosphate-diagenite and iron-containing phosphate is prepared according to the following method:

[0082] (1) Grinding and crushing the lithium phosphate-aluminite, and then roasting the lithium-phosphate-aluminite at 900°C for 3 hours in an air atmosphere to form an aluminum phosphate phase, and mixing the roasted lithium-phosphate-aluminite with ammonium sulfate at a mass ratio of 1:0.4 Lithium is dissolved out, the mixing temperature is 150° C., and the mixing time is 3 hours to obtain an eluate; the roasting is carried out in a muffle furnace;

[0083] (2) Filter and separate the stripping liquid described in step (1) to obtain a lithium-containing solution and an aluminum phosphate-containing precipitate, add ethanol to the lithium-containing solution, take the solid, and redissolve the solid in water to obtain purified Lithium-containing solution (the solute is lithium sulfate); the lithium-containing solution ...

Embodiment 2

[0091] In this embodiment, lithium is extracted from lithium phosphate-diagenite and iron-containing phosphate is prepared according to the following method:

[0092](1) Grinding and crushing the lithium phosphate-aluminite, and then roasting the lithium-phosphate-aluminite at 600°C for 6 hours in an air atmosphere to form an aluminum phosphate phase, and mixing the roasted lithium-phosphate-aluminite with hydrochloric acid at a mass ratio of 1:0.3 Lithium is dissolved out, the mixing temperature is 20°C, and the mixing time is 5h to obtain an eluate; the roasting is carried out in a muffle furnace;

[0093] (2) filter and separate the stripping solution described in step (1), obtain a lithium-containing solution and an aluminum phosphate-containing precipitate, carry out precipitation and impurity removal purification in the lithium-containing solution, and obtain a purified lithium-containing solution (the solute is hydrochloric acid Lithium); The lithium-containing solution...

Embodiment 3

[0098] In this embodiment, lithium is extracted from lithium phosphate-diagenite and iron-containing phosphate is prepared according to the following method:

[0099] (1) Sieve and crush the lithium phosphate aluminum phosphate, and then roast the lithium phosphate aluminum phosphate phase at 1100°C for 0.1h under a nitrogen atmosphere, and mix the roasted lithium phosphate and ammonium sulfate at a mass ratio of 1:0.5 Mixing is carried out to dissolve lithium, the mixing temperature is 300° C., and the mixing time is 13 hours to obtain an eluate; the roasting is carried out in a tube furnace;

[0100] (2) Filter and separate the stripping solution described in step (1) to obtain a lithium-containing solution and an aluminum phosphate-containing precipitate, add acetone to the lithium-containing solution, take the solid, and redissolve the solid in water to obtain purified Lithium-containing solution (the solute is lithium sulfate); the lithium-containing solution is crystalli...

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Abstract

The invention provides a method for extracting lithium from amblygonite and preparing iron-containing phosphate. The method comprises the following steps of (1) treating the amblygonite to dissolve out the lithium, so as to obtain a dissolved solution; (2) separating solid and liquid of the dissolved solution in step (1), so as to obtain a lithium-containing solution and an aluminum phosphate-containing precipitate; (3) extracting the aluminum phosphate-containing precipitate in step (2) by an acid solution, adding an iron source into the extracted solution, adding an alkaline matter to regulate the pH (potential of hydrogen) value, and separating solid and liquid, so as to obtain the iron-containing phosphate. The method has the advantages that the operation is simple, the process is short, the cost is low, and the extracting rate of lithium element can reach 93% or above; the purity of the lithium-containing product is high, and the purity of ferric phosphate and/or ferrous phosphatecan reach 95% by mass or above; the prepared ferric phosphate and/or ferrous phosphate can be used for further synthesizing the lithium iron phosphate.

Description

technical field [0001] The invention belongs to the technical field of metal extraction and separation, and relates to a method for extracting lithium, in particular to a method for extracting lithium from lithium phosphatite and preparing iron-containing phosphate. Background technique [0002] Lithium is one of the lightest metals. Lithium metal and its alloys and compounds have been widely used in nuclear power generation, light high specific strength alloys, metallurgy, aluminum smelting, high-energy batteries, medicine, glass, ceramics, grease, petroleum, chemical industry, organic It has been widely used in many fields such as synthesis, light metal welding, non-metallic mineral surface modification and daily necessities production. In recent decades, countries such as the United States, Britain, Germany, France, Japan, and Russia have successively invested a large amount of capital, manpower, and material resources in the development of aluminum-lithium alloys, magnes...

Claims

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Application Information

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IPC IPC(8): C01B25/37C01D15/06C01D15/04C01D15/08
CPCC01B25/375C01D15/04C01D15/06C01D15/08
Inventor 孔令涌尚伟丽李洁凤黄少真
Owner SHENZHEN DYNANONIC
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