Ion type rare earth ore leaching site rapid leaching method

An ion-type rare earth ore and ore leaching technology, which is applied in the direction of material separation, instruments, and analysis materials, etc., can solve the problems of long leaching time, inability to promote, poor ammonia nitrogen removal effect, etc.

Pending Publication Date: 2020-05-08
TSINGHUA UNIV
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  • Abstract
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  • Application Information

AI Technical Summary

Problems solved by technology

At the same time, in the mining process of ion-type rare earth ores, the associated heavy metals Cu, Cd, Zn, Pb and other ions will be activated, causing heavy metal pollution after entering the water body.
[0004] In recent years, in order to remove the ammonia nitrogen in the leaching site of ionic rare earth ore, Jiangxi South Rare Earth Group has tried water leaching-reverse osmosis membrane purification in the Zudong mining area. The experiment has been carried out for nearly a year, but the operation cost is high and the leaching The washing time is long, the water consumption is large, and the removal effect of ammonia nitrogen is not good, so it cannot be popularized
It has also been proposed to use 250mg / L neutral salt KCl solution for leaching, which can greatly reduce the amount of water used. The acid and ammonia nitrogen enter the eluent together, which can accelerate the elution of acid and ammonia nitrogen compared with water leaching, but currently only Laboratory-scale research, and the price of potassium chloride is high, whether it can be applied in practice needs further research

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Weigh 6g ferrous sulfate (FeSO 4 ·7H 2 O) and 2g aluminum sulfate [Al 2 (SO 4 ) 3 ] mix (FeSO 4 ·7H 2 O / Al 2 (SO 4 ) 3 =3:1), dissolved in 2 liters of deionized water, and prepared into a solution with a concentration of 2g / L; adjusted to pH 4.5 with 1M dilute sulfuric acid to obtain a eluent; The soil sample with a depth of 3-5 meters) has been tested. The total content of ammonia nitrogen (NH3) in the soil sample is 286mg / kg, the water-soluble and exchangeable ammonia nitrogen is 268mg / kg, the fixed ammonia nitrogen is 18mg / kg, and the rare earth ( ΣRE) content is 85 mg / kg; take 200 grams of soil sample to make exchange column, use above-mentioned eluent to wash the exchange column, collect eluate and analyze the content of ammonia nitrogen and rare earth in eluate, when eluent is collected After 400ml, the ammonia nitrogen and rare earth in the eluate were both less than 1mg / L, indicating that the leaching has been completed; the soil sample in the eluent co...

Embodiment 2

[0024] Weigh 10g of slag from a rare earth in Jiangxi to separate and remove impurities (its aluminum content is 2.0%), dissolve it with 1M / L sulfuric acid to adjust the pH to 4.5, then filter the filtrate to make 100ml slag solution; weigh 10g of industrial grade Ferrous Sulfate (FeSO 4 ·7H 2 0) be dissolved in water and merge the previous 100ml slag solution and then dilute to 4 liters with water, adjust to pH 4.5 with 1M dilute sulfuric acid to obtain eluent; Get 200 grams of soil samples in Example 1 to make exchange column, and newly prepare The eluent was used to wash the exchange column, and the eluent was collected to analyze the ammonia nitrogen and rare earth content in the eluent. When the eluent was collected to 400ml, the ammonia nitrogen and rare earth in the eluent were less than 1mg / L, indicating that the eluent It has been completed; the soil samples in the washing column were removed and dried, and the contents of ammonia nitrogen and rare earth (ΣRE) were a...

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Abstract

The invention discloses an ion type rare earth ore leaching site rapid leaching method, and belongs to the technical field of environmental protection. The method comprises the following steps that 1)a leaching material is compounded by using ferrous sulfate and aluminum sulfate; 2) the leaching material is dissolved in water to prepare an aqueous solution, and the pH value is adjusted with sulfuric acid to prepare a leaching solution; and 3) a leaching column is prepared from an ion type rare earth ore leaching site soil sample in a closed mine, and the prepared leaching solution is used forleaching. The economical and cheap rapid leaching material is developed through the method, and over 95% of the water solubility of the ion type rare earth ore leaching site soil sample and ammonia-nitrogen-exchanged elution can be realized; and meanwhile, over 90% of residual rare earth in the soil sample is exchanged into the leaching solution. Environmental treatment is carried out on the iontype rare earth ore in-situ leaching site of the closed mine, and a good effect is achieved.

Description

technical field [0001] The invention belongs to the technical field of environmental protection, and in particular relates to a rapid leaching method for ionic rare earth ore leaching sites. Background technique: [0002] Ion-adsorbed rare earth ores are rich in medium and heavy rare earth elements and can be used in high-tech fields such as electronic communications, aerospace, and military affairs, and are a mineral resource of very important strategic significance. Ionic rare earth mining mainly uses ammonium sulfate as the leaching agent. Before 2007, pool leaching and heap leaching were the main methods, and then the in-situ leaching process was fully used. When ionic rare earths are mined, excessive ammonia nitrogen is absorbed into the soil of the mining area. Some studies have found that the ammonia nitrogen in the mining field and nearby areas can be as high as 0.97kg / t during mining. After 3 years of mine closure, the ammonium nitrogen content in 1cm to 20cm soil i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B59/00C22B3/08
CPCC22B59/00C22B3/08Y02P10/20C22B1/00C22B3/04G01N30/02G01N2030/027
Inventor 朱国才胡湖生
Owner TSINGHUA UNIV
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