UA65233A - Method for preliminary preparation of base fine-impregnation less-common metal ore - Google Patents

Abstract

A method for preliminary concentration of base fine-impregnation less-common metal ore includes grinding, desliming and gravity separation of ore and finishing of the obtained concentrate on the concentration tables. In this case the grinding is carried out to the coarseness less than 0.1 mm, deslimation is carried out for the class - 0.015-0.020 mm, and gravity concentration is performed on the centrifugal separator.

Description

The invention belongs to the field of beneficiation of minerals, namely gravity beneficiation of poor fine-grained rare metal ores and can be used for preliminary beneficiation, for example, of zircon-pyrochlore ores. There is a well-known method of beneficiation of poor fine-grained rare metal ores, according to which the crushed ore is subjected to hydraulic classification into narrow coarse classes (1). Further, these classes are enriched on settling machines and concentration tables (each class is separate from the others). After such preliminary enrichment, raw rare metal concentrates are obtained. Industrial products and enrichment tailings are crushed, classified and fed to the second and third stages of pre-enrichment. Rough rare metal concentrates from all stages of beneficiation are combined and refined into marketable concentrates by a combination of gravity, electric, electromagnetic and flotation methods. A significant disadvantage of this method of enrichment is the complexity of the technological scheme and related difficulties in managing the technological process. In addition, hydraulic classifiers used to classify crushed ore have low power and separation efficiency. Due to these shortcomings, known enrichment schemes have low rates of extraction of rare elements into concentrates.

Also known, chosen as a prototype, is the method of pre-enrichment of poor fine-grained rare metal ores, according to which the original ore is crushed, subjected to screening, main concentration on screw separators (21. Concentrate and industrial products are purified on concentration tables to obtain rough concentrate and tailings. According to this method, rough rare metal concentrates, which are further refined.The use of screw separators for pre-enrichment reduces the total number of gravity devices (concentration tables) in the technological scheme, which allows to simplify the technological scheme somewhat.

The disadvantage of the prototype method is that the enrichment indicators do not increase significantly, and the material reduction rate on screw separators is somewhat higher than on concentration tables. That is, the amount of raw concentrate increases, and the content of useful components in it decreases. The invention is based on the task of ensuring high recovery of rare elements and increasing their content in the raw concentrate.

The task is solved by the fact that in the method of enrichment of poor fine-grained rare metal ores, the main concentration is carried out on an off-site concentrator. At the same time, there is no need to carry out a screening operation.

The main concentration on the ventral concentrator provides a more effective separation of "light" and "heavy" minerals, thanks to the powerful influence of the centrifugal field, which provides a force ten times higher than the force of the earth's gravity. The claimed method is carried out in this way. Poor fine-grained rare metal ore is crushed to a grain size of less than 0.1 mm. Next, the crushed ore is subjected to desilting according to the class of 0.015-0.020 mm in hydrocyclones or other devices. Then the de-slimmered ore is enriched in a venter concentrator. At the same time, the heavy fraction concentrates rare metal minerals, the specific gravity of which is higher than the host rock.

The resulting concentrate is purified on concentration tables to obtain a rough concentrate and tails.

In this way, raw rare metal concentrates are obtained, which are then subjected to flotation or hydrometallurgical finishing.

Example 1.

This method was used by us during the development of the technology for extracting rare metals from enrichment waste

This method was used by us during the development of the technology for the extraction of liquid metals from waste enrichment of Mariupolites of the Mariupol (Masurovsky) rare metal deposit.

Enrichment waste has the following chemical composition, 90: 3.27-3.90 (GeozhRezOz); 59.48-59.80 5102; 19.95-20.80

AI2O3; 4.30-5.70 MagO; 4.82-5.87 K2O; 0.70-0.90 Garden; 0.20-0.27 21O2; 0.08-0.10 Mr2O5; 0.30-0.60 TiO".

In laboratory conditions, research was carried out on the separation of Mariupolite enrichment wastes in the industrial field into heavy and light fractions. The company's concentrator was used for the research

Kpeizop of the KO-MDZ brand. The enrichment results are shown in the table. 1. The sample crushed to a coarseness of 0.1 mm was divided into classes of 0.05 and -0.05 mm. The mode of enrichment was found for each class experimentally.

Table 1

Indicators of enrichment of waste crushed to 0.1 mm

Class -0.05 mm, incl. 55.20 0.074 0.310 40.95 68.05 - heavy fraction | 3.43 0.560 3.750 20.24 51.48 - light fraction | 51.77. .52 61.81 95.61 0.054 0.100 51.48 38.19

The heavy fraction is composed of 60,396 light minerals and 39,795 heavy minerals, of which 3495 have weak or strong magnetic properties. When separating on a magnetic separator, it is possible to increase the mass fraction of Mr2O5 to 2.895 (magnetic fraction), and 7gO" to 5.395 (non-magnetic fraction).

The light fraction at 90.095 is composed of feldspars and nepheline. Its weight content of KgO is 6.24965,

Mago - 6.7195. However, the content of heavy minerals in it is 1095, which explains the high weight content of BegOz -3.5295.

The analysis of the obtained experimental data shows that, unlike devices such as a screw separator, a sluice or a concentration table, the Kpe!zop concentrator more fully separates the heaviest minerals into the heavy fraction - pyrochlore, zircon, magnetite, ilmenite, iron hydroxides. It partly includes minerals of medium density - aegirin, lepidomelan, as well as light minerals - feldspars, nepheline. At the same time, the yield of the heavy fraction is relatively low (from 15.73 to 4.3995), the extraction of МО2О5 and 2гО" is satisfactory (44.85-48.5295 and 61.81-73.890, respectively) with a low quality of the heavy fraction. A significant share of aegirin and lepidomelan, as well as iron hydroxides remains in the light fraction, which explains the high weight content of BegOz in the latter (2.93-3.5295).

Further processing of the heavy fraction with the extraction of niobium, tantalum, zirconium and other rare metals can be carried out using known hydrometallurgical technologies.

Sources of information 1. Polkin S.I. Enrichment of ores and deposits of rare metals, M., "Nedra", 1967, p. 356-362. 2. Tsarkov V.A., Khoroshev V.A., Boldfev V.A. et al. New technological scheme of gravity beneficiation of poor, hard-to-be enriched ores of rare metals // Gornyi zhurnal. -2002. - Me8. - P. 82-85.

Z. Potemkin A.A. The Kpeizop Sopsepigaits company is a world leader in the production of gravity centrifugal separators // Gornyiy zhurnal. -1998.-Me5.-0.77-84.

Claims (1)

The method of preliminary beneficiation of poor fine-grained rare metal ores, which includes grinding, de-slagging and gravity beneficiation of ore 1 proofing of the obtained concentrate on concentration tables, which is distinguished by the fact that grinding leads to a size of less than 0.1 mm, de-slagging is carried out by grade - 0.015-0.020 mm, and gravity enrichment is carried out on a centrifugal separator.