Comprehensive utilization method for directly extracting lithium by silicate-based lithium-containing ore acid process

A technology of lithium ore and silicate, which is applied in the field of lithium extraction from ore, can solve the problems of increased production cost, low resource utilization rate, and large equipment corrosion, and achieve the goals of reduced production energy consumption, no discharge of three wastes, and wide adaptability of raw materials Effect

Active Publication Date: 2019-12-03
FUZHOU UNIV
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Problems solved by technology

The use of hydrochloric acid in the leaching reaction of this method corrodes the equipment greatly, and additionally uses a large amount of expensive NaOH or KOH for fluorine regeneration, and the leaching solution has complex components such as fluorine, chlorine, and sulfate radicals, which makes separation difficult and increases production costs. This method only extracts lithium and a small amount of aluminum from lepidolite, and the resource utilization rate is low

Method used

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  • Comprehensive utilization method for directly extracting lithium by silicate-based lithium-containing ore acid process

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Effect test

Embodiment 1

[0037] The natural α-type spodumene is crushed and ground and sieved to D 90 =62.630μm, to obtain spodumene powder, make slurry with fluosilicic acid (100%), sulfuric acid (100%), and water at a mass ratio of 1:0.2:0.3:4, and put it into a stirring reactor , the reaction was continuously stirred at 70°C for 4h. After the reaction is completed, filter, and the obtained filtrate is recycled to make a slurry with spodumene powder. The obtained filter cake is mixed with concentrated sulfuric acid (the concentration of sulfuric acid is greater than 80%, and the conversion is 100%) according to the weight ratio of 1:0.6. In the roasting furnace, roast at 290°C for 0.5h. After the roasting is completed, the obtained roasted material and water are mixed and stirred at a mass ratio of 1:3 for leaching. The temperature of leaching is controlled at 30°C for 1h. After the leaching is completed, it is filtered and washed, and the obtained lithium-containing filtrate is used to produce lit...

Embodiment 2

[0039] Lepidolite is crushed and ground and sieved to D 90=54.354μm, to obtain lepidolite powder, make slurry with fluosilicic acid (100%), sulfuric acid (100%), and water at a mass ratio of 1:0.5:0.2:6, and put it into a stirred reactor , The reaction was continuously stirred at 50° C. for 3 h. After the reaction is completed, filter, and the obtained filtrate is recycled to make a slurry with spodumene powder, and the obtained filter cake is mixed with concentrated sulfuric acid (the concentration of sulfuric acid is greater than 80%, and the conversion is 100%) according to the weight ratio of 1:0.8, and then put into In the roasting furnace, roast at 260°C for 1 hour. After the roasting is completed, the obtained roasted material and water are mixed and stirred according to the mass ratio of 1:5. After the leaching is completed, it is filtered and washed, and the obtained lithium-containing filtrate is used to produce lithium salts, sodium salts, potassium salts, aluminum...

Embodiment 3

[0041] Lithium china stone is crushed and ground and sieved to D 90 =82.777μm, to obtain lithium china stone powder, make slurry with fluosilicic acid (100%), sulfuric acid (100%), and water at a mass ratio of 1:0.3:0.4:8, and put it into a stirring reactor , the reaction was continuously stirred at 90°C for 2h. After the reaction is completed, filter, and the obtained filtrate is recycled to make a slurry with spodumene powder. The obtained filter cake is mixed with concentrated sulfuric acid (the concentration of sulfuric acid is greater than 80%, and the conversion is 100%) according to the weight ratio of 1:1. In the roasting furnace, roast at 300°C for 1 hour. After the roasting is completed, the obtained roasted material and water are mixed and stirred according to the mass ratio of 1:7. After the leaching is completed, it is filtered and washed, and the obtained lithium-containing filtrate is used to produce lithium salts, sodium salts, potassium salts, aluminum salts ...

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Abstract

The invention discloses a method for extracting lithium by using silicate lithium-containing ore as a raw material through an acid process. The method comprises the following steps: the lithium-containing silicate ore such as natural alpha-spodumene and lepidolite is crushed and ground, sieving is performed, the obtained lithium ore powder, fluorosilicic acid, sulfuric acid and water are used to prepare slurry, reaction is performed at a certain temperature, filtration is performed, the filtrate is recycled for preparation of slurry from lithium ore, the filter cake and concentrated sulfuric acid are mixed, the mixture is put into a roaster for a reaction, the roasted product is extracted by using water to extract a lithium salt, an alkali metal salt and an aluminum salt, and the extraction slag is quartz slag. The invention provides a general method suitable for extraction of the lithium, other alkali metals, aluminum and silicon from various silicate-based lithium-containing ore, andthe method can realize maximum utilization of resources and fluorine cycle, reduce energy consumption, and realize green and environment-friendly production of extraction of the lithium from the ore.

Description

technical field [0001] The invention belongs to the field of lithium extraction from ores, and in particular relates to a comprehensive utilization method for directly extracting lithium from silicate lithium-containing ores by an acid method. Background technique [0002] Lithium is the lightest alkali metal. It has the characteristics of soft metal texture and low density. It is a very active metal element with chemical properties. As a green new energy material, lithium is widely used in various industries and has very high scientific research value and broad commercial value. [0003] Due to its very active chemical properties, lithium cannot exist in the form of simple substances in nature. Lithium mainly exists in two types in nature, one exists in rock ore in the form of lithium-containing silicate ores such as spodumene, lepidolite, lithium petalite, lithium china stone, lithium clay, etc. Lithium ions exist in salt lake brine, underground brine and seawater in the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B33/12C01D5/00C01D15/06C01D17/00
CPCC01B33/12C01D5/00C01D15/06C01D17/00Y02P10/20
Inventor 刘慧勇郝慧玲旷戈余美燕黄海沈志民
Owner FUZHOU UNIV
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