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Method for recovering rare earth from ionic type rare earth crude ore

An ionic rare earth and rare earth technology, applied in rare earth metal compounds, chemical instruments and methods, inorganic chemistry, etc., can solve the problems of leachate leakage, ecological environment pollution, and imprecise structure of the mine floor, so as to eliminate pollution and avoid reactions. Slow, cost-reducing effect

Active Publication Date: 2011-09-21
GRIREM ADVANCED MATERIALS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, in the process of in-situ leaching, if the exploration of the geological structure is not in place, the floor structure of some mines is not tight, and the artificial floor is not well done, there will be local leakage of the leachate, resulting in a large amount of ammonium ions, Rare earth ions pollute groundwater sources and other issues
[0005] From the above, a large amount of electrolyte solutions containing ammonium ions and sodium ions are consumed in the leaching process of ion-type rare earth ores, and they all enter the soil and groundwater, causing serious pollution to the ecological environment. Therefore, it is urgent to develop green Environmental mining technology

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] Add 800 kilograms of ionic rare earth raw ore (rare earth grade 0.063% REO) in the leaching pool, magnesium sulfate (MgO content is 45g / L) and ammonium sulfate (NH 4 + content is 5.0g / L) mixed leaching agent 600 liters into the leaching pool, after the leaching agent is basically infiltrated, add 200 liters of top water, collect the leaching solution, and obtain 605 liters of rare earth sulfate leaching solution, the REO content is 0.78g / L , The rare earth leaching rate is 93.6%. The leachate was adjusted to pH 5 with magnesium oxide, filtered after clarification, 12.5 liters of homemade magnesium bicarbonate solution (MgO 18g / L) was added to the filtrate, stirred for 1 hour at room temperature, clarified and filtered, the filter cake was washed twice with water, and dried , to obtain 0.98 kg of mixed rare earth carbonate product, of which REO 46%, Al 2o 3 0.5%, CaO 0.76%. The pH value of the precipitation mother liquor is 6.5, add ammonium sulfate, adjust the pH v...

Embodiment 2

[0038] Add 800 kilograms of ionic rare earth ore (rare earth grade 0.063% REO) in the leaching pool, magnesium chloride (MgO content is 55g / L) and ammonium chloride (NH 4 + Content is 3g / L) 800 liters of mixed ore leaching agents are added to the leaching pool, and 200 liters of top water are added after the leaching agents have penetrated, and the leachate is collected to obtain 755 liters of rare earth chloride leachate, the REO content is 0.62g / L, and the rare earth The leaching rate was 92.9%. The leaching solution was adjusted to pH 5.3 with magnesium oxide and calcium oxide, filtered after clarification, and 11 liters of self-made magnesium bicarbonate and calcium bicarbonate mixed solution (MgO+CaO 22g / L, CaO 0.3g / L) were added to the filtrate, Stir at low temperature for 0.5 hours, clarify and filter, wash the filter cake twice with water, and spin dry to obtain a mixed rare earth carbonate product, which is roasted at 900°C for 3 hours to obtain 0.44 kg of a mixed ra...

Embodiment 3

[0040] 200 tons of ionic rare earth raw ore (rare earth grade 0.115% REO) were stacked together, compacted, and the bottom was isolated with plastic cloth, and magnesium chloride (MgO content was 95g / L) and ammonium sulfate (NH 4 + content of 1.0g / L) mixed ore leaching agent 120M 3 Spray slowly onto the rare earth raw ore, and finally use 20M 3 Rinse with water, collect leachate, and obtain rare earth leachate 103M 3 , REO content is 2.05g / L, rare earth leaching rate is 91.8%. The leaching solution is adjusted to pH 4.8 with magnesium oxide, filtered after clarification, and homemade magnesium bicarbonate solution (MgO 42g / L) 2.4M is added to the filtrate 3 , stirred at room temperature for 1.5 hours, clarified and filtered, washed the filter cake twice with water, and dried to obtain mixed rare earth carbonates, which were roasted at 900°C for 3 hours to obtain 213 kg of mixed rare earth oxide products, of which REO 92.3%, Al 2 o 3 0.88%, CaO 1.33%. The pH value of the...

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Abstract

The invention discloses a method for recovering rare earth from ionic type rare earth crude ore, which comprises the following steps of: leaching the ionic type rare earth crude ore by taking at least one of magnesium sulfate, magnesium chloride and calcium chloride, instead of most or all ammonium sulfate, ammonium chloride or sodium chloride, as an ore leaching agent to obtain rare earth leachate, performing neutralization and impurity removal, and precipitating rare earth by adopting solution of magnesium hydrogen carbonate or / and calcium bicarbonate to obtain a rare earth carbonate product. In the method, an ammonium bicarbonate precipitator and most or all ammonium sulfate, ammonium chloride and sodium chloride serving as ore leaching agents are eliminated, pollution of ammonia nitrogen wastewater and high-salinity sodium salt wastewater on environment and underground water is greatly reduced or eliminated, and the method is an environment-friendly ionic type rare earth ore mining process.

Description

technical field [0001] The invention relates to a method for recovering rare earth from ionic rare earth raw ore, which belongs to the industry of mining, dressing and smelting of nonferrous metals. Background technique [0002] Ionic rare earth minerals are rare earth minerals that exist in an ionic state. Most of the rare earth elements in rare earth minerals exist in the state of cations and are adsorbed on some mineral carriers. For example, the unique ion adsorption rare earth minerals in southern my country , most of its rare earth ions are mainly adsorbed on aluminosilicate minerals such as kaolinite and muscovite or fluorocarbonate minerals. The rare earth content of this mineral is generally very low, but the proportion of medium and heavy rare earth is high, so it is a kind of precious rare earth resource. [0003] At present, electrolytic solutions containing ammonium ions or sodium ions are used as leaching agents in industry to leach ionic rare minerals. Ammoniu...

Claims

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Application Information

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IPC IPC(8): C01F17/00
Inventor 黄小卫于瀛冯宗玉赵娜
Owner GRIREM ADVANCED MATERIALS CO LTD
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