The method for extracting scandium from solutions for industrial raw materials processing

 

(57) Abstract:

The invention relates to ferrous metallurgy, in particular, to the extraction and concentration of scandium from multicomponent solutions for the processing of various industrial raw materials, mainly unprocessed red mud from alumina production, waste melts titanium chlorinators, waste mother solutions of zirconium production. The method involves the extraction of scandium from solutions of phosphate sorbents, desorption of scandium carbonate solutions, the acidification of the resulting eluate, additional extraction and concentration of scandium from acidified eluates. Processing concentrated on scandium solution lead precipitation of low-solubility compounds of scandium, then perform filtering and calcining precipitation with getting scandium concentrates. Before the deposition is carried out an additional concentration of scandium in solution by contacting the acidified carbonate eluate with a semi-permeable membrane, the pores of which are impregnated with a liquid extractant and on the other side of which at the same time circulates the solution of mineral acid. In addition, as a liquid extractant, impresionado the change 0.5-1.5 M solution of hydrochloric acid. The method allows to increase the extraction of scandium in the concentrate and to improve its quality. 3 C.p. f-crystals, 1 table.

The invention relates to ferrous metallurgy, in particular to hydrometallurgical methods for selective extraction and concentration of scandium from technogenic raw materials from multicomponent complex waste and can be used for complex processing of red mud from alumina production, waste melts titanium chlorinators, solutions from the processing of zircon and ilmenite concentrates - production waste ZrO2and TiO2and other

The method for extracting scandium from solutions for industrial raw materials processing (A. C. 1609166 the USSR. The method for extracting scandium from solutions from processing waste. Publ. 10.05.2000, BIPM 2000, N 13. S. 395). The known method consists in the adsorption of scandium from solutions from the processing of various waste production of phosphate exchange resin with subsequent washing of the resin, the desorption of scandium carbonate-bearing solution, the precipitation of carbonate scandium-containing eluate of poorly soluble compounds by the introduction of aluminum fluoride in the amount of 50-100 g per 1 g of scandium at 70-90o

Known analogues closest to the claimed invention by a combination of traits and purpose is the method for extracting scandium from solution processing of technogenic raw materials - metal waste (ferrous metallurgy, 1994, No. 8. S. 22-25; non-ferrous metals, 1999, No. 1. S. 60-65) is adopted for the prototype. The way the prototype includes sorption of scandium from solutions of phosphate sorbents, desorption of scandium carbonate solution, acidification of the eluate, the precipitation of low-solubility compounds of scandium, filtering, separating the precipitate from the solution and calcining precipitation with getting scandium concentrates.

For reasons that impede the achievement of specified following technical result when using the known method is that the method-prototype direct extraction of scandium in the sludge concentrate is from diluted by scandium solutions (carbonate eluates). This entails things is their volumes of solutions, what complicates the process and reduces its effectiveness.

The claimed technical solution aimed at solving the problem, which consists in the simplification of processing scandium eluates. The technical result that can be obtained by carrying out the claimed invention, is to reduce the volume of recyclable solutions and in the increase in the concentration of scandium in the final product.

This technical result in the implementation of the claimed invention is achieved in that in the known method for extracting scandium from solutions for industrial raw materials processing, including extraction of scandium from solutions of phosphate sorbents, desorption of scandium carbonate solution, acidification of the eluate, the precipitation of low-solubility compounds of scandium, filtering and calcining precipitation with getting scandium concentrates peculiarity lies in the fact that before the deposition is carried out an additional concentration of scandium in solution by contacting the acidified carbonate eluate with a semi-permeable membrane, the pores of which are impregnated with a liquid extractant and on the other side of which at the same time circulates the solution of mineral acid.

In addition, the feature of the method is that as the mineral acid used is 0.5-1.5 M solution of hydrochloric acid.

In addition, the feature of the method lies in the fact that contacting the eluate with a membrane lead with the speed of 250-400 DM3/mins2and the circulation of the solution of a mineral acid with a speed of 10-20 DM3/mins2.

Under other equal conditions the above new procedures, new techniques for their implementation ensure the achievement of the technical result in the implementation of the claimed invention.

Analysis of the totality of the features of the claimed invention, new procedures, new techniques for their implementation and achieved this result indicates that between them there is a causal relationship, which is expressed in the following. To obtain the final concentrate additional concentration of scandium from carbonate and acidified eluate performed by contacting the latter with a semi-permeable membrane, the rich liquid extractant (solution Caprylic acid in H-dodecane), the other is the awn circulation on both sides of the membrane, respectively source scandium-containing solution (acidified eluate) and the host ions Sc3+the solution of mineral acid.

At the second stage of processing of primary Sc-containing concentrate of the proposed new method using membrane extraction, the following occurs. In membrane extractor, consisting in the simple case of two chambers separated by a semi-permeable membrane made of Teflon, using a peristaltic pump circulates on one side of the membrane (through the 1st chamber with volume V1) source scandium-containing solution (donor), and on the other side of the membrane (through the 2nd camera with V2and V2V1) circulates pure solution of mineral acid. In the pores of the membrane impresivan liquid extractant selectively "exciting" scandium from the solution, the donor, and "carry" in a solution of acceptor. The driving force of the process is the concentration gradient of ions H+on both sides of the membrane. The difference in the velocity of circulation (the volumes of the chambers of the apparatus), the selection gradient (CH+), the nature and concentration of the liquid extractant can selectively extract and to a significant extent (tens and hundreds of times) to concentrate scandium in pure solution.

Advantages of the claimed method of extraction and concentration of scandium that is obtained when privlechenia scandium in the final concentrate is increased by 4,5-6,9%, the content Sc2O3in the latter increases by 5.5-16,0%, and the volume of the final solution during the precipitation of reduced on average by 4.5 times. In addition, the application of membrane extraction to end selective concentration reduces also the amount of different leaching acidic solutions, i.e., to simplify the technological process as a whole.

1. The method for extracting scandium from solutions for industrial raw materials processing, including extraction of scandium from solutions of phosphate sorbents, desorption of scandium carbonate solution, acidification of the eluate, the precipitation of low-solubility compounds of scandium, filtering and calcining precipitation with getting scandium concentrates, characterized in that before the deposition is carried out an additional concentration of scandium in solution by contacting the acidified carbonate eluate with a semi-permeable membrane, the pores of which are impregnated with a liquid extractant, and on the other side of which at the same time circulates the solution of mineral acid.

2. The method according to p. 1, characterized in that as the liquid extractant impregnated into the pores of the membrane, use 0.75 to 1.5 M solution of Caprylic acid in N-dodecane.

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4. The method according to p. 1, wherein the contacting the eluate with a membrane lead with the speed of 250-400 DM3/min cm2and the circulation of the solution of a mineral acid with a speed of 10-20 DM3/min cm2.

 

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