Enrichment separation extraction method of rare earth element in pulverized fuel ash
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A rare earth element and extraction method technology, which is applied in the chemical industry, can solve the problems of limited use and low economic added value, and achieve the effects of high rare earth element content, high extraction rate, and convenient process operation
Inactive Publication Date: 2017-12-29
ANHUI UNIVERSITY
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my country is the world's largest producer of fly ash. According to Xinhuanet data, my country's fly ash output reached 620 million tons in 2015. At this stage, fly
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example 1
[0020] The content of rare earth elements in the fly ash used in Example 1 is 94.79±1.73 μg / g, and the total amount of rare earth elements in 10 g of fly ash is about 947.9 μg.
[0021] A method for enriching, separating and extracting rare earth elements in fly ash, characterized in that it comprises the following steps:
[0022] (1) Grind and sieve the fly ash to a particle size below 300 mesh, weigh 10 g into a round-bottomed flask, mix with 50 mL of hydrochloric acid with a volume fraction of 50%, heat to 85°C, stir for 1 hour, and use a medium speed filter paper to filter;
[0023] (2) adding mass fraction in the filtrate is 25% NaOH solution, after the reaction is completed, filter and separate the precipitate;
[0024] (3) Use hydrochloric acid with a volume fraction of 15% to dissolve the precipitate, then add 10 mL of oxalate-acetone solution with a concentration of 40%, and heat to near boiling;
[0025] (4) Use ammonia water to adjust the pH value of the solution ...
example 2
[0031] The content of rare earth elements in the fly ash used in Example 2 is 84.68±4.02 μg / g, and the total amount of rare earth elements in 10 g of fly ash is about 846.8 μg.
[0032] A method for enriching, separating and extracting rare earth elements in fly ash, characterized in that it comprises the following steps:
[0033] (1) Grind the fly ash to a particle size below 200 mesh, weigh 10 g in a round bottom flask, mix with 50 mL of hydrochloric acid with a volume fraction of 50%, heat to 85°C, stir for 1 hour, and use a medium-speed filter paper filter;
[0034] (2) adding mass fraction in the filtrate is 25% NaOH solution, after the reaction is completed, filter and separate the precipitate;
[0035] (3) Use hydrochloric acid with a volume fraction of 15% to dissolve the precipitate, then add 25 mL of oxalic acid acetone solution with a concentration of 40%, and heat to near boiling;
[0036] (4) Use ammonia water to adjust the pH value of the solution to 2.0, then ...
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Abstract
The invention discloses an enrichment separation extraction method of a rare earth element in pulverized fuel ash. The method comprises following steps: the pulverized fuel ash is ground to the grain size below 200 meshes, the pulverized fuel ash is weighed and is placed in a round-bottom boiling flask, hydrochloric acid with the volume fraction being 50% is added for mixing, heating and stirring are carried out, and medium speed filter paper is used for filtering; an NaOH solution is added into filtrate, and after the reaction is finished, filtering and separate deposition are carried out; hydrochloric acid is used for dissolution precipitation, and then, an oxalic acid acetone solution is added and is heated to be boiled; ammonium hydroxide is used for adjusting the pH value of the solution to 2.0, then, water is added for dilution, and heat preservation is carried out for 1h; filtering after cooling is carried out, an oxalic acid solution is used for repeated washing, precipitation is placed in a muffle furnace to be fired for 30 min, and after firing, the matter is rare earth oxide mixed crude extract. The industrious solid rubbish pulverized fuel ash is used, the waste is turned into wealth, the beneficial effects of being easy and convenient to operate, high in extract rate and high in content of crude extract rare earth element, and the method is suitable for application and popularization.
Description
technical field [0001] The invention belongs to the technical field of chemical industry and relates to a method for enriching, separating and extracting rare earth elements in fly ash. Background technique [0002] Rare earth elements provide raw material support for the development of national green technology, and there is a huge demand in emerging markets. [0003] Fly ash is a solid waste produced by coal combustion. my country is the world's largest producer of fly ash. According to Xinhuanet data, my country's fly ash output reached 620 million tons in 2015. At this stage, fly ash is mainly used in construction cement raw materials, foundation engineering fillers, and agricultural soil improvement. Low economic added value and limited use. [0004] According to the previous analysis and survey data, the content of rare earth elements in fly ash in my country ranges from 7.1 to 550 μg / g, with an average value of 115.1 μg / g. With the increasing strategic value of rare ...
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