Method for extraction of lithium and removal of aluminum by vitriolization of lepidolite

A technology of sulfuric acid treatment and lepidolite, which is applied in the direction of alumina/aluminum hydroxide, lithium carbonate; Fully utilized, low extraction rate of alkali metals, etc., to achieve high extraction efficiency of alkali metals, realize zero pollution tail gas emissions, and simplify the production process

Active Publication Date: 2015-09-02
JIANGXI HZONE LITHIUM TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Limestone roasting method, chlorination roasting method, traditional sulfuric acid method, etc., all use high-temperature sintering for mineral phase reconstruction, and the temperature is generally around 800-1100 °C for 60-120 minutes, so energy consumption is high, material flow is large, Li The extraction rate of alkali metals is low, and resources such as valuable metals such as rubidium and cesium cannot be fully utilized, which does not reflect the advantages and value of lepidolite resource utilization

Method used

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  • Method for extraction of lithium and removal of aluminum by vitriolization of lepidolite
  • Method for extraction of lithium and removal of aluminum by vitriolization of lepidolite
  • Method for extraction of lithium and removal of aluminum by vitriolization of lepidolite

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specific Embodiment 1

[0032] The raw material lepidolite concentrate used in the present invention is dried by a spiral dryer, the heat source is provided by the residual heat attached to the tail gas of the medium-temperature sintering process section, and the lepidolite powder is mechanically activated until the particle size of the lepidolite powder is below 300 mesh. Then mix with dilute sulfuric acid solution to granulate, control the concentration of sulfuric acid to 60wt.%, control dilute sulfuric acid and lepidolite to mix at a mass ratio of 2:1, and continuously treat in a roller kiln at 250°C for 30min. After the reaction is complete, the temperature is gradually raised to 900°C for 30 minutes, and the tail gas is recovered during the heat treatment to prepare sulfuric acid. The obtained clinker is leached with lithium sinking mother liquor, the liquid-solid ratio is controlled to be 2:1, and the reaction is carried out at 25°C for 30 minutes. The slurry is filtered by belt, which integrat...

specific Embodiment 2

[0033]The raw material lepidolite concentrate used in the present invention is dried by a spiral dryer, the heat source is provided by the residual heat attached to the tail gas of the medium-temperature sintering process section, and the lepidolite powder is mechanically activated until the particle size of the lepidolite powder is below 300 mesh. Then mix it with dilute sulfuric acid solution to granulate, control the concentration of sulfuric acid to 65wt.%, control dilute sulfuric acid and lepidolite to mix at a mass ratio of 2.5:1, and continue to treat it in a roller kiln at 200°C for 20min. After the reaction is complete, the temperature is gradually raised to 900°C for 60 minutes, and the tail gas is recovered during the heat treatment to prepare sulfuric acid. The obtained clinker is leached with lithium sinking mother liquor, the liquid-solid ratio is controlled at 2.5:1, and the reaction is carried out at 75°C for 30 minutes. The slurry is filtered by a belt, which i...

specific Embodiment 3

[0034] The raw material lepidolite concentrate used in the present invention is dried by a spiral dryer, the heat source is provided by the residual heat attached to the tail gas of the medium-temperature sintering process section, and the lepidolite powder is mechanically activated until the particle size of the lepidolite powder is below 300 mesh. Then mix with dilute sulfuric acid solution to granulate, control the concentration of sulfuric acid to 60wt.%, control dilute sulfuric acid: mix according to the mass of 2.5:1, and continuously treat in the roller kiln at 220°C for 20min. After the reaction is complete, the temperature is gradually raised to 800°C and the reducing gas CO is introduced to promote the decomposition of aluminum sulfate into Al 2 o 3 , keep the temperature for 30 minutes, and recover the tail gas to prepare sulfuric acid during the heat treatment process. The obtained clinker is leached with lithium sinking mother liquor, the liquid-solid ratio is co...

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Abstract

The invention discloses a method for extraction of lithium and removal of aluminum by vitriolization of lepidolite. The method includes a technical process: 1) mechanical activation of lepidolite; 2) low-temperature vitriolization for extraction of valuable metallic elements; 3) medium-temperature sintering; 4) tail gas recovery; 5) normal-temperature water immersion for extraction of alkali metal sulphates. Alkali metal elements and high-content aluminum in lepidolite are dissolved out and gradually heated until decomposition of aluminum salts, and calcination exhaust is recovered for acid production to realize maximized recycling of leaching agents. Calcination clinkers are subjected to water immersion for extraction of sulfate with the alkali metal elements, and high alkali metal extraction efficiency, technical simplicity, small material flow volume, low energy consumption, maximization in recycling of the leaching agents and the like are realized, so that social benefits of lepidolite are increased. After extraction of the alkali metals, high-aluminum slag can be used for preparation of ceramics, glass, environment-friendly cement, building blocks and the like to realize zero emission of exhaust gas, sewage and waste residues in treatment of lepidolite, and all procedures are in mutual synergy to jointly realize economical and efficient utilization of lepidolite.

Description

technical field [0001] The invention relates to the technical field of mineral raw material processing, in particular to a method for extracting lithium and removing aluminum from lepidolite by sulfuric acid treatment. Background technique [0002] At present, there are many lithium-containing minerals, and the main ones with industrial value are spodumene (Li 2 O·Al 2 o 3 4SiO2 2 ), lepidolite KLi 1.5 al 1.5 [AlSi 3 o 10 ](OH,F) 2 , Lithium feldspar (Li 2 O·Al 2 o 3 ·8SiO2 2 ), phospholithium mica LiAl[PO 4 ](OH,F) and iron lepidolite K(Li,Al,Fe)[AlSi 3 o 10 ](OH,F) 2 . At the same time, salt lake brine is an important source of lithium extraction. Due to the low cost of lithium extraction in brine, there are currently many manufacturers. However, due to the high content of impurities such as Mg in brine, the removal of impurities in the later stage is cumbersome, resulting in low product purity. With the increasing demand, lithium extraction from ore has b...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01D15/08C01F7/02
Inventor 刘金练王迎春
Owner JIANGXI HZONE LITHIUM TECH
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