Method of dressing of eudialyte ores

FIELD: mining.

SUBSTANCE: invention relates to the field of dressing of hard minerals, namely, to methods for enrichment of rare-metal ores. The method of dressing of eudialyte ores includes application of electromagnetic separation in intense field with separation of nepheline-feldspar concentrate into non-magnetic fraction and subsequent electric separation of magnet fractions with production of aegirine and eudialyte concentrates. In the head of the process they perform separation of ore with total secondary characteristic radiation Kα1-series of elements of strontium, yttrium, zirconium and niobium in the energy range of 13.0-17.5 keV.

EFFECT: increased efficiency of extraction of eudialyte concentrate, reduced costs for grinding and crushing of ore, and also reduced quantity of cleaning operations.

1 dwg, 1 tbl, 1 ex

 

The invention relates to the field of solid commercial minerals, and in particular to methods of enrichment of rare-metal ores.

Eudialyte ores are complex raw material for the production of rare metals. Ores have a high concentration of zirconium, niobium, tantalum, rare earths including yttrium, strontium, which determines their complexity.

The structure of eudialyte ores (25-27% eudialyte, 52% feldspar, loparite and nepheline, 20% aegirine) determines the receipt, in addition to the main concentrate of eudialyte, associated aegirine and nepheline-feldspar concentrates.

The main methods of concentration of ores of rare metals are gravity and flotation. In the primary enrichment receives a rough concentrate is then subjected to the lapping ways, combining magnetic and electrical methods for enrichment (Shipulin. Beneficiation of ores and placers of rare and noble metals". M: "Nedra", 1987).

The main disadvantages of the gravity-flotation rare metal ore is a large number of roughing operations, the need for finishing the rough concentrates and magnetic (or electric methods, high losses of valuable components from the sludge, the use of wide range of chemicals.

the technology of enrichment of the rich eudialyte ores using only methods for electromagnetic and electrical separation and production of standard eudialyte concentrate, containing 12% ZrO2and 2% ∑TR2O3, aegirine and nepheline-feldspar concentrates (Akilin, Avetura and other "Development of processing technology-rich eudialyte ores - a new type of Zirconia-tricoderma mineral raw materials". Scientific review, No. 3, 2012).

The technology adopted for the prototype, involves the application at the beginning of the process of electromagnetic separation in a strong field that allows you to allocate the non-magnetic fraction nepheline-feldspar concentrate. During subsequent electrical separation magnetic fractions in a conductive fraction allocated aegirine, and non-conductive fraction represents eudialyte concentrate.

Ore processing is presented in figure 1.

The disadvantage of this method is the necessity of increasing the number of roughing operations by reducing the content of zircon in the original ore.

The technical result of the proposed method is the possibility of gross ore mining and involvement in the processing of the poor eudialyte ores, reducing the number of roughing operations when conducting electromagnetic and electrical separation, reducing the cost of crushing and grinding of ore due to the output of the processing blade up to 35% of the original ore (containing less than 0.3% ZrO2).

Technical result is achieved by p is the application in the beginning of the process x-ray radiometric separation (RRC) of ore with a total secondary characteristic radiation α 1-series of the elements strontium, yttrium, zirconium and niobium in the energy range of 13.0-of 17.5 Kev.

The essence of the method lies in the fact that before conducting electromagnetic and electrical separation ore is subjected to x-ray irradiation and registered secondary characteristic radiation in the energy range of 13.0-of 17.5 Kev.

Thus, the dividing sign with an x-separation is characteristic overall radiation α-series elements strontium, yttrium, zirconium, and niobium.

An example implementation of the method

Check the efficiency of the method was carried out in relation to the poor audiality ore with content of 1.54% ZrO2and 0.26% ∑Zr2O3.

The table shows the comparative results of ore without the use of x-ray radiometric separation and using pre-RRC ore.

Comparative results of the enrichment audiality ore without the use and application of pre-PPC
No.Name of productOutput %Content, %Izvlecheny is,%
ZrO2TR2O3ZrO2TR2O3
I - without the use of PPC
The original ore100,01,540,26100,0100,0
1Eudialyte concentrate8,6113,112,2073,4473,35
2Aegirine concentrate29,290,520,099,9010,14
3Nepheline-feldspar concentrate43,680,1420,234,033,86
4The middlings3,19 1,630,273,373,31
5Sludge15,230,9360,169,269,34
II - using PPC
The original ore100,01,540,26100,0100,0
1Tails RRC (in the dump)33,200,260,06the ceiling of 5.607,50
2Commercial product RRC, including66,802,170,3694,4092,50
3- eudialyte concentratewhich 9.2212,802,16376,60 75,40
4- aegirine concentrate19,540,680,0938,607,00
5- nepheline-feldspar concentrate27,890.110,0172,001,80
6sludge10,151,090,217,208,30

For the version I without RRC received conditional eudialyte concentrate containing 13,11% ZiO2and 2.2% ∑TR2O3when removing and ZrO2and ∑TR2O3at the level of 73%, and aegirine concentrate, suitable for the production of criminalising products, and nepheline-feldspar concentrate, suitable for ceramic industry. The middlings are sent to the head of process or displayed together with slimes.

However, for conforming concentrates on option I require a large number of roughing operations (up to 6).

For option II with RRC also received conforming to ncentrate, moreover, the extraction of ZrO2and ∑TR2O3in eudialyte concentrate on 2-3% higher. Significantly reduced the number of roughing operations (1-3).

Thus, the claimed method is compared with the prototype the following advantages:

- significant reduction in the number roughing operations when conducting electromagnetic and electrical separation of ore;

- ensure the quality of the concentrates;

- reducing the cost of crushing and grinding of ore due to the output of the processing 30-35% tails RRC in the dump;

- possibility of gross ore mining and involvement in the processing of the poor eudialyte ores.

The enrichment method of eudialyte ores involving the use of electromagnetic separation in a strong field with some emphasis on the non-magnetic fraction nepheline-feldspar concentrate and subsequent electrical separation magnetic fractions with getting aegirine and eudialyte concentrate, characterized in that the head process is carried out x-ray radiometric separation of ore from the total secondary characteristic radiation α1-series of the elements strontium, yttrium, zirconium and niobium in the energy range of 13.0-of 17.5 Kev.



 

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