SU1717236A1 - Method of flotation of phosphoric ores - Google Patents

Abstract

The invention relates to the enrichment of minerals and m. used in the flotation of phosphate ores. The purpose of the invention is to increase the recovery of phosphorus pentoxide while reducing the consumption of the apolar collector. The raw materials are conditioned with regulators, carboxyl and apolar collectors. Then flotation is carried out. A concentrate of aromatic hydrocarbons (CAU) containing 8–18% by weight of paraffin-naphthenic hydrocarbons is used as an apolar collector. The KAU density at 20 ° C is 960-985 kg / m, the viscosity is YN5 mm2 / s at 100 ° C. Before being introduced into the conditioning, the KAU is mixed with kerosene. The ratio of KAU and kerosene is from 1: 1 to 1: 2. KAU is obtained from the oil fraction boiling at 400-500 ° C by phenol purification, distillation of the phenol and extraction of the concentrate by distillation. The method, as compared with the known, provides an increase in phosphorus pentoxide recovery by 0.6-3.8% with a 30% reduction in the apolar collector consumption. 1 hp f-ly. SO with

Description

This invention relates to the beneficiation of minerals, in particular, to the technology of flotation of phosphorite ores.

The purpose of the invention is to increase the recovery of phosphorus pentoxide while reducing the consumption of the apolar collector.

The feedstock is conditioned with regulators, carboxyl and apolar collectors. As an apolar collector, an aromatic hydrocarbon concentrate containing 8–18% by weight paraffin-naphthenic hydrocarbons with a density of 960–985 kg / m3 at 20 ° C and a viscosity of 10–15 mm2 / s at 100 ° C is introduced into the air conditioning. At the same time the aromatic concentrate

hydrocarbons before addition to conditioning are additionally mixed with kerosene. The ratio of concentrating aromatic hydrocarbons and kerosene is from 1: 1 to 1: 2.

Concentrates of aromatic hydrocarbons were obtained in the laboratory from an oil fraction boiling at 400-500 ° С by phenol purification followed by distilling off the phenol and isolating the concentrate of aromatic hydrocarbons.

The results of laboratory tests are shown in the table.

These concentrates are tested in the flotation methods of phosphorite ores from various deposits.

Xi

Yu

00 Och

An increase in the concentration of aromatic hydrocarbons in a mixture with kerosene in excess of that specified (1: 1-2) leads to an increase in the viscosity of the mixture, which requires the use of an elevated temperature (40 ° C) in the preparation of the reagent.

A decrease in the concentration of aromatic hydrocarbons in the mixture leads to an increase in the consumption of kerosene and, consequently, to an increase in the gas content of the working premises.

PRI me R. As a source of raw materials were used: phosphate ores (co-indicators

Density at 20 ° С, kg / m3

Viscosity at 100 ° С, mm2 / s

Composition:

paraffin naphthenic

hydrocarbons, May. %

aromatic

hydrocarbons, May. %

Resins, May,%

Flash point, ° С Volatile content at 20-30 ° С (kerosene)

holding 7.2% PaOs, crushed to 0.3 mm; ores, crushed to 0.15 mm, containing 18.3% PaOs; washed concentrate, crushed to 0.18 mm, slime on CL. 0.074 mm, containing 17% P20s); flotation reagents (soda, liquid glass, carboxyl collector, tall oil, bottom residues of FFA fraction C21-C25, flotation agent VGS, sulphate soap), apolar reagents, (aromatic hydrocarbon concentrates, samples):

one

Sample 2 972

12

Sample 3 985

15

14

82 4 225

ABOUT

eight

87 5 240

ABOUT

Flotation of ores was carried out in a flotation machine with a chamber volume of 0.5 liters. At first the sample of the floated raw material was loaded, and then reagents were introduced. The duration of contact with reagents is 3-5 minutes. Flotation was carried out according to the two-cleaned ore concentrate scheme.

Analysis of the data indicates a decrease in the consumption of kerosene by a third or half of the norm of the prototype.

In most of the examples, the increase in P20s recovery is 3.5% -3.8 and 0.6%.

Thus, the use of the proposed method provides an increase in the increase in phosphorus pentoxide by 0.6–3.8% with a 30% reduction in the apolar collector consumption.

Claims (2)

1. A method of flotation of phosphate ores, including preconditioning of the feedstock with regulators, carboxyl and apolar collectors and release of phosphorus-containing minerals, characterized in that, in order to increase the recovery of phosphorus pentoxide while reducing the consumption of apolar collector, as apol The collector is injected with a concentrate of aromatic hydrocarbons containing 8–18% by weight paraffin-naphthenic hydrocarbons with a density of 960–985 kg / m3 at 20 ° C and a viscosity of 10–15 mm2 / s at 100 ° C. 2. The method according to claim 1, wherein the fact that the concentrate of aromatic hydrocarbons is mixed with kerosene before being introduced into the conditioning, the ratio of the concentrate of aromatic hydrocarbons and kerosene being between 1: 1 and 1: 2.