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Method for treatment and resource utilization of alkali metal slag extracted through lepidolite solid fluorine reconstruction

A technology of alkali metal and lepidolite, applied in the direction of improving process efficiency, can solve the problems of lack of research and comprehensive utilization of extraction of alkali metal slag, and achieve the advantages of resource utilization, reduction of melting temperature, and reduction of neutralizer dosage. Effect

Active Publication Date: 2015-11-11
JIANGXI HZONE LITHIUM TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0009] However, in the existing research on lepidolite minerals, the research on lepidolite ore phase reconstruction treatment is mainly carried out as an important component of lithium extraction, and there is a lack of treatment for the obtained lepidolite fluorine-fixed reconstitution to extract alkali metal slag. Research and Comprehensive Utilization

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  • Method for treatment and resource utilization of alkali metal slag extracted through lepidolite solid fluorine reconstruction
  • Method for treatment and resource utilization of alkali metal slag extracted through lepidolite solid fluorine reconstruction

Examples

Experimental program
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Effect test

Embodiment 1

[0042] Add dilute hydrochloric acid (1.2mol / L) and pretreated slag into the reactor at a mass ratio of 2:1 for acidolysis: raise the temperature to 60°C and stir for 45 minutes; detect the pH value of the acid-soluble slurry, and then add A small amount of neutralizer to control the pH to 4.5 for 30 minutes, then filter to separate CaCl 2 Solution, prepare CaCl by concentrating and analyzing salt 2 ﹒ 2H 2 O crystals, the salt precipitation mother liquor rich in Ca and alkali metal salts are directly used for mixing with lepidolite raw materials to form pellets, which is one of the main sources of mineral phase restructuring agent raw materials.

[0043] Dilute sulfuric acid (5wt.%) and reconstituted residue after drying treatment were added to the reaction kettle at a mass ratio of 5:1 for secondary acidolysis: the temperature was raised to 60°C and stirred for 30 minutes, and then filtered for liquid-solid separation. After countercurrent washing, the washing liquid is use...

Embodiment 2

[0049] Add dilute hydrochloric acid (0.96mol / L) and pretreated slag into the reactor at a mass ratio of 2.5:1 for acidolysis: raise the temperature to 80°C and stir for 60 minutes to detect the pH of the acid-soluble slurry, and then add a small amount of The neutralizer controls the pH to 4.5 and maintains it for 60 minutes, then filters and separates CaCl 2 Solution, prepare CaCl by concentrating and analyzing salt 2 ﹒ 2H 2 O crystals, the salt precipitation mother liquor rich in Ca and alkali metal salts are directly used for mixing with lepidolite raw materials to form pellets, which is one of the main sources of mineral phase restructuring agent raw materials.

[0050] Dilute sulfuric acid (6wt.%) and reconstituted residue after drying treatment were added to the reaction kettle at a mass ratio of 5:1 for secondary acidolysis: the temperature was raised to 70°C and stirred for 35 minutes, and then filtered for liquid-solid separation. After countercurrent washing, the ...

Embodiment 3

[0056] Add dilute hydrochloric acid (1.44mol / L) and pretreated slag to the reactor at a mass ratio of 3:1 for acidolysis: raise the temperature to 90°C and stir for 60 minutes to detect the pH of the acid-soluble slurry, and then add a small amount of The neutralizer controls the pH to 4.5 and maintains it for 60 minutes, then filters and separates CaCl 2 Solution, prepare CaCl by concentrating and analyzing salt 2 ﹒ 2H 2 O crystals, the salt precipitation mother liquor rich in Ca and alkali metal salts are directly used for mixing with lepidolite raw materials to form pellets, which is one of the main sources of mineral phase restructuring agent raw materials.

[0057] Dilute sulfuric acid (4wt.%) and the reconstituted residue after drying treatment were added to the reactor at a mass ratio of 4:1, heated to 90°C, stirred and reacted for 35 minutes, and then filtered for liquid-solid separation. The filter residue was washed in countercurrent, washed Liquid is used to dilu...

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Abstract

The invention relates to a method for treatment and resource utilization of alkali metal slag extracted through lepidolite solid fluorine reconstruction. The extracted alkali metal slag comprises slag components acquired after extracting one or more compounds of Li, K, Rb and Cs metal elements under the condition that F in lepidolite ores is converted into CaF2 for lepidolite ore-phase reconstruction. The method includes the steps of primary acidolysis of solid fluorine reconstruction slag, calcium chloride neutralization, separation, recycling and secondary acidolysis, and aluminum sulfate recycling. The alkali metal slag extracted through lepidolite solid fluorine reconstruction comprises most calcium silicoaluminate, fluorite, a small amount of sodium silicoaluminate and the like, a reconstruction agent is recycled through primary diluted acid leaching, by-products like aluminum salt are extracted through secondary diluted acid leaching, the calcium content in the slag is reduced, the plasticity of tailings is improved, the slag is directly used for raw materials of glass ceramics, ceramics, environment-friendly cement, building blocks and the like, the economic value of the slag is improved, and the comprehensive use efficiency of lepidolite is increased.

Description

technical field [0001] The invention relates to slag treatment, in particular to a lepidolite fluorine-fixed reconstruction slag treatment and resource utilization method. 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 been favored by some manufacturers and gradually...

Claims

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Application Information

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IPC IPC(8): C22B7/00C22B26/20C22B21/00
CPCY02P10/20
Inventor 刘金练王迎春
Owner JIANGXI HZONE LITHIUM TECH
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