Weathering crust illuviation-type rare-earth ore leaching agent and method for extracting rare earths by using same

A weathering crust leaching type, rare earth ore technology, applied in the direction of improving process efficiency, can solve problems such as short supply and large demand, and achieve the effect of eliminating ammonia nitrogen wastewater pollution and reducing ammonia nitrogen wastewater pollution

Inactive Publication Date: 2014-01-01
WUHAN INSTITUTE OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the commonly used leaching agent is generally 1-4% ammonium sulfate, which has a high recovery rate of rare earths, but

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Take by weighing 250.0g of the weathered crust leaching type rare earth ore that dries, and the preparation mass percentage is 0.5% ammonium citrate ((NH 4 ) 3 C 6 h 5 o 7 ) solution is the leaching agent, according to the ratio of solid-liquid ratio (solid mass to leaching agent volume ratio) of 1:2, the flow rate is adjusted to be controlled at 0.4mL / min, and the weathering crust leaching type rare earth ore is column leached to obtain rare earth The rare earth content of the leaching mother liquor was measured by EDTA volumetric method, which was REO1.119mmol / 250g rare earth ore. After removing impurities, it was enriched by oxalic acid precipitation, filtered, washed and burned at 900°C.

[0029] According to analysis and determination, the recovery rate of rare earth is 94.3% (the recovery rate is obtained by directly weighing the burning material and comparing the total ionic phase rare earth content), and the purity is 92.6% (using GB / T14635-2008).

Embodiment 2

[0031] Take by weighing 250.0g of dried weathering crust leaching type rare earth ore, and prepare magnesium citrate (Mg 2 (C 6 h 5 o 7 ) 3 ) solution is the ore leaching agent, add hydrochloric acid to adjust the pH to 5.0, adjust the flow rate at 0.4mL / min according to the solid-to-liquid ratio of 1:2, carry out column leaching on the weathering crust leaching type rare earth ore, and obtain the rare earth leaching mother liquor The rare earth content was determined by EDTA volumetric method as REO0.0962mmol / 250g rare earth ore. After removing impurities, it was enriched by oxalic acid precipitation, filtered and washed, and burned at 900°C.

[0032] After analysis and determination, the recovery rate of rare earth was 92.3%, and the purity was 92.3%.

Embodiment 3

[0034] Take by weighing 250.0g of the dried weathering crust elution type rare earth ore, and prepare 1.0% sodium citrate (Na 3 C 6 h 5 o 7 2H 2 O) The solution is the ore leaching agent, and the flow rate is adjusted to 0.4mL / min according to the solid-to-liquid ratio of 1:2, and column leaching is performed on the weathering crust leaching type rare earth ore to obtain the rare earth leaching mother liquor and use the EDTA volumetric method to determine the rare earth The content is REO1.108mmol / 250g rare earth ore. After removing impurities, it is enriched by ammonium bicarbonate precipitation method, filtered and washed, and burned at 900°C.

[0035] After analysis and determination, the recovery rate of rare earth was 93.4%, and the purity was 92.1%.

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Abstract

The invention provides a weathering crust illuviation-type rare-earth ore leaching agent and a method for extracting rare earths by using the same, particularly a leaching agent solution for weathering crust illuviation-type rare-earth ores. The active component is citrate, wherein the citrate is any one of ammonium citrate, sodium citrate, potassium citrate and magnesium citrate, or mixture of sodium citrate, potassium citrate and magnesium citrate. The method for extracting rare earths from weathering crust illuviation-type rare-earth ores comprises the following steps: leaching by using the citrate as the active component of the leaching agent to obtain a rare-earth leaching mother solution, removing impurities, and adding a precipitant to obtain a rare-earth enriched substance. In the weathering crust illuviation-type rare-earth extraction process, cation exchange interaction and anion (citrate ion) complex action exist, and the two actions can cooperate to enhance the rare-earth recovery rate and lower the concentration and consumption of the leaching agent.

Description

technical field [0001] The invention belongs to the field of hydrometallurgy, and in particular relates to a weathering crust leaching type rare earth ore leaching agent and a method for extracting rare earth. Background technique [0002] The weathering crust elution-type rare earth ore is a special rare earth mineral with a high proportion of medium and heavy rare earth, and it is a strategic mineral for national development. The rare earth elements in the weathering crust leaching type rare earth ores are mainly adsorbed on the clay minerals in the form of hydrated or hydroxyl hydrated ions, and the rare earth grade is low, only 0.05-0.3%. The ore particle size is extremely fine, and more than 50% of the rare earths are stored in the -0.78mm particle size with a yield of 24-32%. Conventional physical beneficiation cannot enrich rare earths into corresponding rare earth concentrates, so chemical leaching can only be used technology. [0003] When the weathering crust elu...

Claims

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Application Information

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IPC IPC(8): C22B3/04C22B59/00
CPCY02P10/20
Inventor 池汝安李琼徐志高张臻悦何正艳
Owner WUHAN INSTITUTE OF TECHNOLOGY
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