The method of extraction of rare-earth metals, scandium and yttrium from the red mud of alumina production

 

(57) Abstract:

The invention relates to ferrous metallurgy and can be used to obtain a rare non-ferrous metals. The essence of the invention is that the slurry of red mud are divided by the density of the heavy and light fraction, after which the heavy fraction is subjected to magnetic separation in a magnetic field 40-160 kA/m Implementation of the method can reduce the amount of harmful impurities in the resulting concentrate and to increase the degree of extraction of rare-earth metals, scandium and yttrium. table 2.

The invention relates to ferrous metallurgy and can be used to obtain a rare non-ferrous metals.

The method for extracting scandium from red mud based on the acid treatment of the sludge with obtaining soluble compounds extracted product. C. the USSR N 1321089). The disadvantages of this method are strong contamination of the acid solution of the compounds of the main components contained in the sludge (Al2O3, SiO2, CaCO3and others), low concentration of scandium in the acid solution, which makes his selection from the solution, a significant consumption of acid.

As about the classification and magnetic separation of the sludge when the magnetic field strength 30 - 80 kA/m.with. USSR N 1715874). The disadvantages of this method are considerable content of harmful impurities in the resulting magnetic concentrate and not a high degree of extraction of scandium.

The problem to be solved by the proposed method is to reduce the amount of harmful impurities in the resulting concentrate and increase the degree of extraction of rare-earth metals, scandium and yttrium.

The solution of the stated problem is achieved in that the method includes obtaining a slurry of red mud and magnetic separation to obtain a magnetic concentrate containing iron, rare earth metals, scandium and yttrium, before magnetic separation of red mud is subjected to separation by density to heavy and light fractions, and subjected to magnetic separation of the heavy fraction in magnetic field strength of 40 to 160 kA/m

When the separation of the red mud density in the heavy fraction of moving a large part of carbonates and magnetite. Because magnetite is strongly magnetic mineral, then remove it from the heavy fraction is not difficult, despite the presence of large amounts of carbonates. Magnetite concentrate containing rare-earth metals, scandium and attractie red mud and the magnetic concentrate is given in table. 1, in wt.%.

Selection modes of the process of magnetic separation can provide a high degree of extraction of rare-earth metals, scandium and yttrium. The results of experiments with different values of magnetic field strength are given in table. 2.

When the magnetic field strength below 40 kA/m extraction of rare-earth metals, scandium and yttrium drops below 50%, which leads to large losses of metals.

When the magnetic field strength of more than 160 kA/m deteriorates the quality of the concentrate due to the growth of harmful impurities.

The method is as follows.

Red mud in the form of a slurry with solid content up to 50% are served in a centrifugal concentrator with continuous discharge of the heavy fraction (for example, firms KNELSON), where the separation of the sludge density at a flow rate of fluidizing water 3 - 10 l/min and the centrifugal acceleration 40 - 100 m/s. Then the heavy fraction of the sludge is subjected to magnetic separation in a magnetic field of 40 to 160 kA/m

The extraction of rare earth metals, scandium and yttrium from the received magnetic concentrate is carried out by any known method, such as acid leaching.


 

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