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Method for directly preparing lithium sulfate from hard rock type lithium ore

A lithium sulfate and sulfate technology, applied in the direction of lithium sulfate/sulfite, etc., can solve the problems of unstable molten salt storage materials, molten salt corrosion, etc., and achieve the effect of low energy consumption and simple process flow

Pending Publication Date: 2022-04-19
EAST CHINA UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, current state-of-the-art molten salt storage materials are unstable at high temperatures, and molten salt is corrosive and unsuitable for use in current conditions

Method used

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  • Method for directly preparing lithium sulfate from hard rock type lithium ore
  • Method for directly preparing lithium sulfate from hard rock type lithium ore
  • Method for directly preparing lithium sulfate from hard rock type lithium ore

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Will Li 2 Spodumene ore with an O content of 6.1% (mass fraction) and sodium sulfate were mixed evenly by dry ball milling at a mass ratio of 1:0.9, placed in a muffle furnace and roasted at a constant temperature of 980°C for 30 minutes to obtain a roasted material.

[0027] according to figure 1 , when spodumene ore and sodium sulfate are mixed and roasted under the above conditions, α-spodumene and sodium sulfate react to form lithium sodium sulfate; after the roasting material is soaked in water, lithium sodium sulfate is dissolved and leached by water, and the calculation is about 92% of the lithium in α-spodumene was converted to sodium lithium sulfate.

Embodiment 2

[0029] Will Li 2 Spodumene ore with an O content of 6.1% (mass fraction) and sodium sulfate were mixed evenly by dry ball milling at a mass ratio of 1:0.1, placed in a muffle furnace and roasted at a constant temperature of 1050°C for 120 minutes to obtain a roasted material.

[0030] The XRD pattern of the calcined material and figure 1 Similarly, when spodumene ore and sodium sulfate are mixed and roasted under the above conditions, α-spodumene and sodium sulfate react to form lithium sodium sulfate; after the roasting material is immersed in water, lithium sodium sulfate is dissolved and leached by water, and the calculation is about 80% of the lithium in α-spodumene was converted to sodium lithium sulfate.

Embodiment 3

[0032] Will Li 2 Spodumene ore with an O content of 5.3% (mass fraction) and sodium sulfate were mixed evenly by dry ball milling at a mass ratio of 1:3, placed in a muffle furnace and roasted at a constant temperature of 700°C for 50 minutes to obtain a roasted material.

[0033] The XRD pattern of the calcined material and figure 1 Similarly, when spodumene ore and sodium sulfate are mixed and roasted under the above conditions, α-spodumene and sodium sulfate react to form lithium sodium sulfate; after the roasting material is immersed in water, lithium sodium sulfate is dissolved and leached by water, and the calculation is about 78% of the lithium in α-spodumene was converted to sodium lithium sulfate.

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Abstract

The invention provides a method for directly preparing lithium sulfate from hard rock type lithium ores, which comprises the following steps: uniformly mixing lithium ores with a roasting aid to obtain a mixture, the roasting aid comprising a sulfate aid; and roasting the obtained mixture in a muffle furnace to obtain a roasted material containing the lithium sulfate salt. According to the method, the hard rock type lithium ore is used as a raw material, the lithium ore and the roasting auxiliary agent are uniformly mixed and roasted, the lithium sulfate salt is directly produced, the technological process is simple, and meanwhile, a new thought is provided for utilization and development of the hard rock type lithium ore and preparation of the lithium sulfate salt.

Description

technical field [0001] The invention belongs to the technical field of utilization of lithium ore resources, in particular to a method for directly preparing lithium sulfate from hard rock lithium ore. Background technique [0002] Concentrating solar thermal power is a method of collecting solar energy without the use of photovoltaic panels. Current concentrated solar thermal power generation is mainly based on molten salt storage technology. However, current state-of-the-art molten salt storage materials are unstable at high temperatures, and molten salt is corrosive and unsuitable for use under current conditions. Solid-solid phase change materials can overcome all the shortcomings of molten salts. Lithium sulfate salts, such as lithium sodium sulfate, have good thermal stability and are an important part of solid-solid phase change materials. [0003] Hard rock lithium deposits mainly include spodumene, lepidolite, lithium clay and other minerals. Among them, spodumen...

Claims

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Application Information

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IPC IPC(8): C01D15/06
CPCC01D15/06
Inventor 刘程琳裘晟波祝悦王蓬林李江昊于建国
Owner EAST CHINA UNIV OF SCI & TECH