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Method for preparing lithium carbonate from coal ash

A technology of fly ash and lithium carbonate, applied in the direction of lithium carbonate;/acid carbonate, solid waste removal, etc., to achieve the effect of comprehensive utilization and improvement of economic benefits

Active Publication Date: 2013-05-15
CHINA SHENHUA ENERGY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

So far there is still no good method to extract lithium from fly ash economically and in large quantities

Method used

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  • Method for preparing lithium carbonate from coal ash
  • Method for preparing lithium carbonate from coal ash

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0066] Filter the mother liquor to make the content of floating substance less than 0.01g / L, take 1L and heat it to 74°C, add H to the solution 2 o 2 15mL, to oxidize all the ferrous ions to ferric ions; then add ammonia water dropwise to the solution, adjust the pH to 1.9, and filter out the iron ions in the solution. Slowly add 3.9 L of 1.8 mol / L sodium hydroxide solution dropwise to the solution under constant stirring, continue stirring the solution for 1 hour and then filter to obtain a precipitate, which weighs 98.2 g after drying. Place the precipitate in a muffle furnace, calcinate at 200°C for 90 minutes, leach the clinker with warm water at 50°C, control the liquid-solid ratio during leaching to 5:1, and filter for 60 minutes. At normal temperature, 20g of sodium carbonate was added to the filtrate, filtered and dried after 20 minutes to obtain 1.83g of lithium carbonate product with a product purity of 92%.

Embodiment 2

[0068] Filter the mother liquor to make the content of floating substance less than 0.01g / L, take 1L and heat it to 68°C, add H to the solution 2 o 2 15mL to oxidize all iron ions into ferric ions. Add ammonia water dropwise to the solution, adjust the pH value to 2.6, and filter out the iron ions in the solution. Slowly add 3.7L of 2.3moL / L sodium hydroxide solution dropwise to the solution under constant stirring, continue to stir the solution for 1 hour and then filter to obtain a precipitate, which weighs 93.2g after drying. Place the precipitate in a muffle furnace, calcinate at 400°C for 60 minutes, leach the clinker with warm water at 55°C, control the liquid-solid ratio during leaching to 10:1, and filter for 60 minutes. At normal temperature, 20g of sodium carbonate was added to the filtrate, filtered and dried after 20 minutes to obtain 1.63g of lithium carbonate product with a product purity of 96.3%.

Embodiment 3

[0070] Filter the mother liquor to make the content of floating substance less than 0.01g / L, take 1L and heat it to 43°C, add KMnO to the solution 4 so that all iron ions are oxidized into ferric ions; and low-concentration sodium hydroxide is added dropwise to the solution to adjust the pH to 2.0, so that the iron ions in the solution are precipitated and then filtered. Slowly add 3.9 L of 1.8 mol / L sodium hydroxide solution dropwise to the solution under constant stirring, continue stirring the solution for 1 hour and filter to obtain a precipitate, which weighs 97.1 g after drying. Place the precipitate in a muffle furnace, calcinate at 500°C for 50 minutes, leach the clinker with warm water at 60°C, control the liquid-solid ratio to 8:1 during leaching, and filter for 80 minutes. At room temperature, add 20 g of sodium carbonate to the filtrate, filter and dry after 20 minutes. Obtain lithium carbonate product 1.89g, product purity is 95.4%.

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Abstract

The invention discloses a method for preparing lithium carbonate from coal ash. The method comprises the steps of mother liquor preparation, mother liquor purification, iron oxidization, iron precipitation, lithium-alumium coprecipitation, calcining, leaching or carbonation precipitation, or the steps of mother liquor preparation, mother liquor purification, iron oxidization, NaOH precipitation and carbonation precipitation. The method provided by the invention is capable of effectively extracting lithium in coal ash, thereby realizing comprehensive utilization of coal ash and providing lots of lithium raw material for industrial production; as a result, the economic benefit is improved.

Description

technical field [0001] The invention relates to a preparation method of lithium carbonate, in particular to a method for preparing lithium carbonate from fly ash. Background technique [0002] Lithium is the lightest metal element in nature and a very active alkali metal element. In the metallurgical industry, lithium can act as a deoxidizer and desulfurizer by utilizing the property that lithium can strongly react with substances such as O, N, Cl, and S. In addition, with the continuous development of battery technology and atomic energy industry, the demand for lithium continues to increase, and lithium is called "energy metal". [0003] At present, the raw materials for extracting lithium are mainly lithium ore and lithium-containing brine. Directly extracting lithium from ore requires high-temperature roasting, high-temperature and high-pressure acid leaching and other methods. These methods not only have relatively harsh conditions, but also have problems such as hig...

Claims

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Application Information

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IPC IPC(8): C01D15/08B09B3/00
Inventor 顾大钊郭昭华董斌琦池君洲许立军白健王珍范培育张小东图亚
Owner CHINA SHENHUA ENERGY CO LTD
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