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Method for leaching lithium form coal ash

A fly ash and leaching technology, applied in the direction of improving process efficiency, can solve problems such as immaturity, and achieve the effect of avoiding pollution and improving the value of refined utilization.

Active Publication Date: 2017-09-05
HEBEI UNIV OF ENG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the technology of extracting lithium from fly ash is still very immature. The present invention aims to improve the lithium leaching rate while achieving the purpose of saving costs and reducing energy consumption.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] Sintering process: Weigh fly ash, sodium carbonate and calcium carbonate at a mass ratio of 1:0:1, mix them evenly in a 1L corundum crucible, place them in a muffle furnace for 80 minutes at 1200°C, cool to room temperature, and grind with a ball mill to 200 mesh to obtain sintered clinker.

[0036] Leaching process: Mix 100g of well-ground clinker and 2.0L of 5% sodium carbonate solution evenly, then transfer to a colloid mill, mechanically grind for 30 minutes, and then transfer to an autoclave. After 60 minutes, the mixed liquid in the autoclave was cooled and suction filtered to obtain lithium leachate.

[0037] The atomic absorption spectrometer measures the concentration of lithium ions in the leaching solution, calculates the total lithium mass according to the volume of the leaching solution, and finally concludes that the mass of lithium in the leaching solution accounts for 27.22% of the total lithium content in the fly ash.

Embodiment 2

[0039] Sintering process: Weigh fly ash, sodium carbonate and calcium carbonate at a mass ratio of 1:0.4:1, mix them evenly in a 1L corundum crucible, place them in a muffle furnace for 80 minutes at 1100°C, cool to room temperature, and grind with a ball mill to 200 mesh to obtain sintered clinker.

[0040]Leaching process: Mix 80g of ground clinker and 2.0L of 5% sodium carbonate solution evenly, then transfer to the colloid mill, mechanically grind for 30min, then transfer to the autoclave, the temperature of autoclaving is 150°C, and the time is 60min, after the completion, the mixed liquid in the autoclave was cooled, and suction filtered to obtain lithium leaching solution.

[0041] The atomic absorption spectrometer measures the concentration of lithium ions in the leaching solution, calculates the mass of the total lithium according to the volume of the leaching solution, and finally concludes that the mass of lithium in the leaching solution accounts for 47.11% of the...

Embodiment 3

[0043] Sintering process: Weigh fly ash, sodium carbonate and calcium carbonate at a mass ratio of 1:0.8:1, mix them evenly in a 1L corundum crucible, place them in a muffle furnace for 80 minutes at 1200°C, cool to room temperature, and grind with a ball mill to 200 mesh to obtain sintered clinker.

[0044] Leaching process: 120g of ground clinker and 2.0L of 5% sodium carbonate solution were mixed evenly and then transferred to a colloid mill, mechanically ground for 30 minutes and then transferred to an autoclave. The temperature of high-pressure cooking was 150°C for 60min, after the completion, the mixed liquid in the autoclave was cooled, and suction filtered to obtain lithium leaching solution.

[0045] The atomic absorption spectrometer measures the concentration of lithium ions in the leaching solution, and calculates the total lithium mass according to the volume of the leaching solution. Finally, it is concluded that the mass of lithium in the leaching solution acco...

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Abstract

The invention discloses a method for leaching lithium form coal ash. The method includes the steps of 1), a sintering process, namely weighing the coal ash, sodium carbonate and calcium carbonate in the mass ratio of 1:0:1-1:0:0.8:1, performing even mixing in a corundum crucible, placing the mixture in a muffle furnace for roasting for 60-100 minutes at the temperature ranging from 1000DEG C to 1200DEG C, cooling to indoor temperature and grinding the mixture to 200 mesh with a ball grinding mill; 2), a leaching process, namely evenly mixing a well-ground clinker with a sodium carbonate solution 3-8% in concentration in the solid-to-liquid ratio of 1:15-1:25 prior to transferring to a colloid grinder, subjecting the mixture to mechanical grinding for 30 minutes prior to transferring to a high-pressure kettle, cooling mixed liquid in the high-pressure kettle after high-pressure cooking for 20-60 minutes at the temperature ranging from 100DEG C to 150DEG C is completed prior to performing extraction filtration to obtain lithium leaching liquid. The method for leaching the lithium form the desiliconized coal ash through alkali sintering-dilute alkali dissolution is put forward for the first time, broad research prospects for extracting the lithium form the coal ash are achieved, a foundation is laid for research in developing lithium resources and application strategies, and meanwhile, industrial utilization valve of the coal ash is improved.

Description

technical field [0001] The invention belongs to the refined utilization of fly ash and relates to a method for leaching lithium from fly ash. Background technique [0002] Lithium is an important chemical raw material. As an emerging product, it plays a unique role in the energy field and is widely used in building materials, nuclear industry, electronics industry and chemical industry. Fly ash is a waste discharge from power plants, which is very large and contains many valuable elements such as lithium, aluminum and silicon. Compared with other countries, most of China's fly ash is used as auxiliary materials, and the refined value cannot be reflected. Therefore, the most effective way to realize the refined value of fly ash is to extract these valuable elements from fly ash. [0003] Recently, the associated lithium ore in coal has become a research hotspot for various scholars, and the extraction of lithium from fly ash, a product of coal combustion, has also received ...

Claims

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Application Information

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IPC IPC(8): C22B26/12C22B7/02C22B1/02
CPCC22B1/02C22B7/008C22B7/02C22B26/12Y02P10/20
Inventor 李彦恒安佳伟孙玉壮郝志平樊景森张旭
Owner HEBEI UNIV OF ENG
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