Method of flotation of perovskite-comprising ores

Abstract

FIELD: flotation of perovskite ores.SUBSTANCE: mineral perovskite is a source of industrially important metals – titanium, niobium, tantalum, and rare earth elements. The flotation method for perovskite-comprising ores includes primary flotation, control flotation and two re-cleanings of the froth product of primary flotation in an acidic medium at pH=5.5-6.5 using an octanehydroxamic acid collector. To more firmly fix the collector (octanehydroxamic acid) on the surface of perovskite, an additional reagent 4-methylpentanol-2 (MIBK) is added in the flotation operation in an amount of 5-15% by weight of the amount of the collector.EFFECT: increased extraction of perovskite concentrate.1 cl, 2 tbl, 6 ex

Description

[0001] The mineral perovskite is a source of industrially important metals – titanium, niobium, tantalum, and rare earth elements. Ores containing perovskite are typically complex and are enriched using a combination of methods. Thus, the gravity method has been proposed for processing perovskite-titanomagnetite ores, which makes it possible to obtain perovskite concentrate containing up to 50% titanium oxide with an extraction rate of 32%. [M.S. Khokhulya, L.G. Gerasimova, A.I. Nikolaev. New technological solutions for the preparation and processing of perovskite / / Transactions of the Kola Science Center of the Russian Academy of Sciences. 2018, Vol. 9, No. 2-1, pp. 196-200]. A method for enriching perovskite-titanomagnetite ore by magnetic separation is known, as a result of which perovskite concentrate with a content of 44-48% TiO2 can be obtained [G.P. Andronov, N.M. Filimonova, M.S. Khokhulya Separation of titanium-containing minerals by magnetic separation / / Bulletin of Moscow State Technical University. 2019, Vol. 22, No. 1, pp. 109-119].

[0002] The most effective technology for beneficiating perovskite-titanomagnetite ore is magnetic flotation, which first extracts titanomagnetite concentrate by magnetic separation, followed by flotation enrichment. A known method of perovskite flotation involves pre-flotation of calcite and other minerals from the non-magnetic fraction of perovskite-titanomagnetite ore in an alkaline medium, after which the pH of the pulp is reduced to 4.5-6.8 by adding acid and perovskite is floated with fatty acids and their soaps. A disadvantage of this method was the high sensitivity of the fatty acid collector to the accumulation of hardness, aluminum, and iron ions, which determines a decrease in flotation performance [T.B. Naifonov, V.I. Beloborodov, I.B. Zakharova Flotation Beneficiation of Complex Titanium and Zirconium Ores. Apatity – 1994, 152 p.].

[0003] A method is known for flotation of perovskite with the IM-50 reagent, the active component of which is alkylhydroxamic acids obtained on the basis of a fraction of synthetic acids with a C7-C9 hydrocarbon radical [T.B. Naifonov, A.M. Klyuchnikova, V.I. Efremov, E.N. Odrova Direct flotation of perovskite with the IM-50 collector under pilot-scale conditions / / Ore enrichment.-1976.- No. 5.-P.10-13].

[0004] A method of perovskite flotation is known that excludes preliminary calcite flotation. The use of IM-50 reagent as a collector in combination with liquid glass and carboxymethyl cellulose (CMC) depressants ensures the production of perovskite concentrate containing 48-50% TiO2 with a recovery of 63-68% [L.F. Sklyadneva, T.B. Naifonov, G.G. Morozov, I.B. Zakharova Flotation of perovskite in the presence of carboxymethyl cellulose / / Ore dressing. - 1985. - No. 6. - Pp. 8-11].

[0005] It is proposed to use xylitol esters as a collecting reagent [A.S. 383348 B03D 1 / 02 Application 1396075 / 22-3 dated 01 / 27 / 70. Published 01 / 27 / 1970 Method for flotation of perovskite-containing ores] According to this method, flotation of perovskite is carried out directly from crushed ore without calcite flotation at increased alkalinity of the medium - pH greater than 7.

[0006] Similar to the claimed method is the direct flotation of perovskite with alkylhydroxamic acids from the non-magnetic fraction of perovskite-titanomagnetite ore in an acidic medium without preliminary calcite flotation. The flotation circuit includes primary flotation, scavenger flotation, and two cleaning stages of the perovskite concentrate. When using octanehydroxamic acid as a collector at consumption rates of 500-820 g / t, a perovskite concentrate with a content of 48.2-53.2% TiO2 was obtained from the non-magnetic fraction of perovskite-titanomagnetite ore containing 11.8% TiO2 with an extraction of 67.2-14.4% [Kameneva Yu. S., Chernousenko E. V., Mitrofanova G. V. Effect of the composition of hydroxamic acids on perovskite flotation indicators / / Transactions of the Kola Science Center of the Russian Academy of Sciences. Series: Natural Sciences and Humanities. 2024. Vol. 3, No. 1. pp. 9–15. doi:10.37614 / 2949-1185.2024.3.1.001].

[0007] The invention is aimed at solving the problem of increasing the efficiency of flotation of perovskite-containing ores.

[0008] The proposed perovskite flotation method differs from the existing method in that the octanehydroxamic acid collector is used in combination with the frothing agent 4-methylpentanol-2 (MIBK) at a rate of 5-15% by weight of the collector. The use of this additional reagent promotes stronger adhesion of the collector to the perovskite surface and, as a result, increases the concentrate yield and perovskite recovery compared to the existing reagent regime at the same flow rates.

[0009] The technical result – increased perovskite concentrate recovery – is achieved through the use of the auxiliary reagent MIBK, which enhances the action of the octanehydroxamic acid collector and ensures its stronger attachment to the perovskite surface. This effect is confirmed by the results of flotation of the monomineral fraction of perovskite (size -0.16+0.1 mm), carried out at pH = 5.0-6.0 both under normal conditions and under reagent desorption conditions during liquid phase replacement (Table 1). The strength of the collector attachment to the perovskite was assessed by the concentrate yield γ and the Δ(%) indicator, which shows the percentage of the mineral washed during flotation under reagent desorption conditions:

[0010] Table 1 – Results of frothless flotation of monomineral fraction of perovskite

[0011] Consumption of OGC, mg / l Yield γ, % Yield under desorption conditions γdes, % Δ,% Experimental conditions 7,8 32,8 5,6 82,9 - 7,8 36,2 23,8 34,3 7.5% by weight of MIBK 11 52,3 11,6 77,8 11 29,9 13,4 55,2 7.5% by weight of MIBK 14 84,3 18,1 78,5 14 92,1 24,4 73,5 7.5% by weight of MIBK

[0012] The proposed method for flotation of perovskite-containing ore has been tested under laboratory conditions, which is illustrated by examples.

[0013] Flotation was performed on a sample of the non-magnetic fraction of perovskite-titanomagnetite ore from the Afrikandskoye deposit, containing 9.6% TiO2, in an open-loop process. The process included a rougher flotation, a scavenger flotation, and two cleanings of the rougher flotation froth product. Flotation results were evaluated based on concentrate yield (γ), TiO2 content in froth products (β) and tailings (θ), and TiO2 recovery (ε). A flotation pH of 5.5-6.5 was maintained by adding sulfuric acid.

[0014] Example 1: According to the prototype

[0015] Tests were conducted on a sample of the non-magnetic fraction of perovskite-titanomagnetite ore. Flotation was conducted in an open circuit on a Vectiz laboratory pneumatic-mechanical machine using material crushed to a particle size of -0.2 mm. The flotation cycle included primary (RP) and secondary (RC) flotation. The consumption of octanehydroxamic acid (OHX) collector was 200 g / t. The results are presented in the table.

[0016] Example 2: the claimed method,

[0017] is distinguished by the use of octanehydroxamic acid as a collector in combination with 4-methylpentanol-2 as a reagent in an amount of 7.5% by weight for perovskite flotation. The results are shown in Table 2.

[0018] Example 3: According to the prototype

[0019] Consumption of octanehydroxamic acid (OHX) collector: 250g / t

[0020] Example 4: the claimed method,

[0021] is characterized by the use of octanehydroxamic acid as a collector in combination with 4-methylpentanol-2 as a reagent in an amount of 6.0% by weight for perovskite flotation. The results are shown in the table.

[0022] Example 5: according to the prototype

[0023] Consumption of octanehydroxamic acid (OHX) collector: 300g / t

[0024] Example 6: the claimed method,

[0025] is distinguished by the fact that octanehydroxamic acid is used as a collector for perovskite flotation in combination with 4-methylpentanol-2 as a reagent in an amount of 5.0% by weight. The results are shown in the table.

[0026] Table 2 – Results of flotation of non-magnetic fraction of perovskite-titanomagnetite ore

[0027]

[0028] Example Concentrate Tails Reagent consumption, g / t Yield γ, % β TiO2 content,% Extraction ε,% Content of θ TiO2,% Extraction ε,% Based on the prototype 1 5,0 50,3 26,2 6,22 50,1 OkGK-200 The claimed method 2 9,2 49,89 47,8 1,94 12,2 OKGK-200 MIBK-15 Based on the prototype 3 8,8 50,2 46,0 2,42 17,2 OkGK -250 The claimed method 4 10,7 49,7 56,5 1,65 9,8 OKGK-250 MIBK-15 Based on the prototype 5 13,3 50,4 67,0 2,03 13,7 OkGK - 300 The claimed method 6 14,8 49,76 74,4 1,33 7,3 OkGK - 300 MIBK - 15

Claims

A method for flotation of perovskite-containing ores, including primary flotation, control flotation and two re-cleanings of the froth product of primary flotation in an acidic medium at pH=5.5-6.5 using an octanehydroxamic acid collector, characterized in that, for more secure fixation of the collector - octanehydroxamic acid on the surface of the perovskite, an additional reagent 4-methylpentanol-2 (MIBK) is added in the flotation operation in an amount of 5-15% by weight of the amount of the collector.