Method for extracting and separating high-purity dysprosium oxide and terbium oxide from terbium-dysprosium rare earth enrichment matters

Abstract

The invention relates to a rare earth separation method, and in particular relates to a method for extracting and separating high-purity dysprosium oxide and terbium oxide from various terbium-dysprosium rare earth enrichment materials. The invention aims to provide the method for extracting and separating high-purity dysprosium oxide and terbium oxide from various terbium-dysprosium rare earth enrichment matters which are easily-balanced in system, low in debugging cost, small in acid and alkali consumption, low in production cost as well as low in quantity of high-price terbium element pressing grooves, and saves one-time investment. The method for extracting and separating high-purity dysprosium oxide and terbium oxide from the terbium-dysprosium rare earth enrichment matters comprises the following steps: (1) a continuous saponification and continuous rare earth soap manufacturing process; (2) a pre-grouping process; (3) a tandem separation process; and (4) a two outlets-Gd / / Tb separation process. The method provided by the invention has the advantages that 1, the quality of high-price terbium element pressing grooves is less; 2, the method is easily-balanced in system, low in debugging cost, small in acid and alkali consumption and low in production cost, and saves the one-time investment.

Description

technical field [0001] The invention relates to a rare earth separation method, in particular to a method for extracting and separating high-purity dysprosium oxide and terbium oxide from various terbium-dysprosium rare-earth enrichment materials. Background technique [0002] Terbium-dysprosium rare earth enrichment materials are generally multi-element rare earth mixtures with terbium-dysprosium component as the main component. An intermediate rare earth product mainly composed of terbium and dysprosium, which is obtained from various rare earth raw materials after group separation, is used as a high-quality raw material for further separation of high-purity terbium and high-purity dysprosium. The current extraction and separation of high-purity terbium and dysprosium production lines mostly use multiple two-exit extraction processes to sequentially separate ~GdTbDy / / HoY~, ~GdTb / / Dy, ​​and ~Gd / / Tb for separation, because the produced terbium and dysprosium are both High-p...

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Problems solved by technology

The current extraction and separation of high-purity terbium and dysprosium production lines mostly use multiple two-exit extraction processes to sequentially separate ~GdTbDy / / HoY~, ~GdTb / / Dy, ​​and ~Gd / / Tb for separation, because the produced terbium and dysprosium are both High-purity products have high acid-base consumption and large tanks; some use pre-grouping (fuzzy extraction) technology, but they are all finely divided into two on the element terbium (~GdTb / TbDyHoY~), and then enter the series (~ Gd / / Tb / / DyHoY~) separation process, separated into ~Gd, DyHoY~ two intermediate products and high-purity Tb products, and then connected to two outlets (Dy / / HoY~) process, separated into high-purity Dy and ( HoY~) Two products of holmium and yttrium heavy rare earth enrichment, this process can reduce the acid and alkali consumption by about 20% compared with the previous pure two-exit process, but the high price and small amount of terbium element has a large amount of groove, and it is one-time The investment is 1.5~2.0 times that of the two export processes. This is because terbium with high price and low quantity must form terbium-enriched full peak and pure terbium full peak in the pre-grouping and series separation processes respectively; and high-purity terbium and terbium The quality of dysprosium products is generally >99.95%, and it is difficult to improve to >99.99% of terbium and dysprosium products. This is because the small amount of terbium is divided into two, and it is difficult to control in time when the process or raw materials fluctuate. The quality of dysprosium is difficult to stabilize; at the same time, there is a long time for debugging and balancing, and the cost of debugging is high; moreover, when producing fluorescent grade terbium oxide, the pre-grouping and series separation processes must use high-grade pure hydrochloric acid to increase the cost of acid consumption, otherwise it will be very expensive. Rare earth impurities are difficult to pass and other shortcomings

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