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Leaching method of associated rare earth elements of coal measure strata

A technology for rare earth elements and coal measure strata, which is applied in the field of mineral processing and metallurgy, and achieves the effects of high leaching rate, low production cost and simple test equipment requirements.

Inactive Publication Date: 2014-03-19
CHONGQING INST OF GEOLOGY & MINERAL RESOURCES +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a leaching method for coal-measure strata co-associated rare earth elements in order to overcome the disadvantages that the coal-measure strata co-associated rare earth elements have multiple occurrence forms and traditional techniques cannot be used for beneficiation

Method used

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  • Leaching method of associated rare earth elements of coal measure strata
  • Leaching method of associated rare earth elements of coal measure strata
  • Leaching method of associated rare earth elements of coal measure strata

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] (1) The ore is pre-crushed and ground to a particle size of -46 μm, then mixed with anhydrous sodium carbonate at a mass ratio of 1:1.5, and roasted in a muffle furnace at 800-900°C for 0.5-1h to obtain Roasted products;

[0033] (2) Grind the roasted product obtained in step (1) to a particle size of -75 μm, and carry out water immersion according to a solid-to-liquid ratio of 1 g: 10-20 ml. The water immersion temperature is 60-100 ° C, and the water immersion time is 2-3 hours. The water leaching solution is filtered to obtain a filter residue;

[0034] (3) Dry the filter residue obtained in step (2) at 105°C, grind it to a particle size of -75μm, and then carry out hydrochloric acid pickling according to the solid-to-liquid ratio of 1g:20ml, the concentration of hydrochloric acid is 4mol / L, and the pickling temperature is 40°C , the acid leaching time is 2h, and the acid leaching leaching solution is filtered to obtain the filtrate;

[0035] (4) Wet-pack the pretr...

Embodiment 2

[0039] (1) Same as step (1) in Example 1;

[0040] (2) Same as step (2) in Example 1;

[0041] (3) Dry the filter residue obtained in step (2) at 105°C, grind it to a particle size of -75μm, and then carry out hydrochloric acid pickling according to the solid-to-liquid ratio of 1g:20ml, the concentration of hydrochloric acid is 6mol / L, and the pickling temperature is 60°C , the acid leaching time is 4h, and the acid leaching leaching solution is filtered to obtain the filtrate;

[0042] (4) Wet-pack the pretreated resin into a column, wash to neutrality, and adjust the filtrate obtained in step (3) to Cl with concentrated hydrochloric acid - The concentration is 6-10mol / L, and after heating to 30°C-50°C, it is adsorbed through the ion exchange column equipped with resin at a flow rate of 1-2 drops / second, and the adsorbed solution is collected. The rare earth elements are in the form of chlorides After being enriched into the solution after adsorption, the leaching rate of r...

Embodiment 3

[0046] (1) Same as step (1) in Example 1;

[0047] (2) Same as step (2) in Example 1;

[0048] (3) Dry the filter residue obtained in step (2) at 105°C, grind it to a particle size of -75μm, and then carry out hydrochloric acid acid leaching according to the solid-to-liquid ratio of 1g:20ml, the concentration of hydrochloric acid is 8mol / L, and the acid leaching temperature is 80°C , the acid leaching time is 6h, and the acid leaching leaching solution is filtered to obtain the filtrate;

[0049] (4) Wet-pack the pretreated resin into a column, wash to neutrality, and adjust the filtrate obtained in step (3) to Cl with concentrated hydrochloric acid -The concentration is 6-10mol / L, and after heating to 30°C-50°C, it is adsorbed through the ion exchange column equipped with resin at a flow rate of 1-2 drops / second, and the adsorbed solution is collected. The rare earth elements are in the form of chlorides After being enriched into the adsorbed solution, the leaching rate of ...

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Abstract

The invention discloses a leaching method of associated rare earth elements of coal measure strata. The leaching method comprises the following steps: (1) grinding ores, uniformly mixing with anhydrous sodium carbonate, then roasting; (2) grinding the roasted product, and leaching in water, then filtering to obtain the filter residues; (3) drying the filter residues obtained in step (2), grinding, then leaching in hydrochloric acid, and filtering to obtain the filtrate, and (4) adjusting the filtrate obtained in step (3) through concentrated hydrochloric acid until the concentration of Cl<-> is of 6 to 10mol / L, then absorbing by resin-containing ion exchange column, and collecting the absorbed solution, wherein the rare earth elements are enriched into the absorbed solution in form of chloride. According to the leaching method of associated rare earth elements of coal measure strata, the physical and chemical ore processing method is not carried out, the rare elements (sigma REY) in the ores are directly leached in the solution by roasting, water leaching and acid leaching in sequence, so that the leaching rate is high; and the leaching method is simple in requirement on the test equipment, lower in production cost, and green and environmentally friendly.

Description

technical field [0001] The invention relates to a method for leaching co-associated rare earth elements (ΣREY) in coal-measure strata, belonging to the field of ore dressing and metallurgy. Background technique [0002] Rare earth elements play an important role in the world's most cutting-edge technology fields, and the demand is also increasing rapidly year by year. It is estimated that the world's rare earth demand will increase to 210,000 tons in 2015. my country is a big country with rare earth resources, and the proven reserves account for 67% of the world's total rare earth resources. The main rare earth mines are southern weathering crust leaching type rare earth mines, Baotou Baiyun Obo mixed rare earth mines, Sichuan and Shandong Weishan bastnaesite mines Wait. With the rapid growth of the demand for rare earth resources in recent years, the rare earth mines with high grade and convenient mining are gradually exhausted, and the rare earth resources associated with ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B1/02C22B3/04C22B3/10C22B3/42C22B59/00
CPCY02P10/20
Inventor 李大华刘东代世峰程军胡波邹建华田和明栾进华李甜刘峰杨洪永刘善德
Owner CHONGQING INST OF GEOLOGY & MINERAL RESOURCES