A method and equipment for separating different rare earth elements in rare earth concentrates by high-gravity steps

A technology of rare earth concentrates and rare earth elements, applied in the direction of improving process efficiency, etc., can solve limited and other problems, and achieve the effect of green and efficient recycling

Active Publication Date: 2022-05-03
UNIV OF SCI & TECH BEIJING
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

As of now, there are very limited research reports on the pyrometallurgical process of rare earth concentrates

Method used

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  • A method and equipment for separating different rare earth elements in rare earth concentrates by high-gravity steps
  • A method and equipment for separating different rare earth elements in rare earth concentrates by high-gravity steps
  • A method and equipment for separating different rare earth elements in rare earth concentrates by high-gravity steps

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0049] Continuous step separation of Ce, La, Pr, Nd in rare earth concentrate:

[0050] Step 1. Put 200kg of Baiyun Obo rare earth concentrate into a high-gravity high-temperature reactor, raise the temperature to 1590°C, and keep it warm for 20 minutes until the rare earth concentrate is fully melted.

[0051] Step 2. Continuously lower the temperature of the rare earth concentrate melted in step 1 at a cooling rate of 5°C / min. At the same time, turn on the centrifugal rotation, control the gravity coefficient inside the reactor to G=500, and use supergravity to drive the smelting zone of different rare earth elements. Different rare earth phases realize stepwise interphase transfer and separation.

[0052] Step 3. First, the temperature is lowered to 1500-1400° C., and a supergravity field is continuously applied in the single melting zone of Ce (cerium), so that Ce is continuously enriched into cerium oxide, and continuous separation of cerium oxide phase is realized.

[0...

Embodiment 2

[0060] Step-by-step separation of Ce, La, Pr, Nd in rare earth concentrate:

[0061] Step 1. Put 400kg of Baiyun Obo rare earth concentrate into a high-gravity high-temperature reactor, raise the temperature to 1510°C, and keep it warm for 40 minutes until the rare earth concentrate is fully melted.

[0062] Step 2. Cool the rare earth concentrate melted in step 1 to the smelting interval of different rare earth elements step by step at a cooling rate of 2°C / min, then turn on the centrifugal rotation, control the gravity coefficient G=1000 inside the reactor, and use supergravity Drive different rare earth phases to achieve step-by-step interphase transfer and separation.

[0063] Step 3. Firstly, the temperature is lowered to 1500-1400° C. to achieve single eluting crystallization of Ce (cerium), and Ce is fully enriched into cerium oxide. After the eluting is completed, a supergravity field is applied to realize phase separation of cerium oxide.

[0064] Step 4. Then lower ...

Embodiment 3

[0071] The difference from Embodiment 2 is that the gravity coefficient G=2000.

[0072] In this embodiment, the recovery rate of Ce in the cerium oxide phase is 99.67%, the recovery rate of La in the lanthanum ferrite phase is 99.84%, the recovery rate of Pr in the praseodymium apatite phase is 99.10%, and the recovery rate of Nd in the neodymium apatite phase is 99.31%.

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Abstract

The invention discloses a method and equipment for separating different rare earth elements in rare earth concentrates by supergravity steps, and belongs to the field of rare earth resource recovery. Internal continuous cooling, use of supergravity to drive different rare earth elements in different smelting intervals to realize step-by-step interphase transfer and separation; the invention can selectively enrich different rare earth elements such as Ce, La, Pr, Nd in the complex system of rare earth concentrate Integrating different rare earth phases, and cascade separation and extraction of different high-purity rare earth phases, to realize the green and efficient recovery of rare earth resources in rare earth concentrates, without generating waste gas, waste water, and waste residue discharge problems.

Description

technical field [0001] The invention relates to the technical field of rare earth resource recovery, in particular to a method and equipment for separating different rare earth elements in rare earth concentrates by high-gravity steps. Background technique [0002] Rare earth elements (RE), known as industrial vitamins, consist of 15 lanthanide elements (lanthanum, cerium, praseodymium, neodymium, promethium, samarium, europium, gadolinium, terbium, dysprosium, holmium, erbium, thulium, ytterbium, lutetium) and their Composed of yttrium and scandium with similar chemical properties, it is widely used in the fields of laser, nuclear power, heat-resistant alloys and superconductors because of its unique electronic shell structure. It is known as "the treasure house of high-tech and functional materials in the new century". Baiyun Obo Mine is a rare earth, iron, niobium and other multi-element symbiotic deposit unique to my country. Its ore structure and chemical composition ar...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B59/00C22B9/02
CPCC22B59/00C22B9/02Y02P10/20
Inventor 高金涛郭占成兰茜钟怡玮郭磊王哲
Owner UNIV OF SCI & TECH BEIJING
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