RU2237521C1 - Method of floatation concentration of potassium ores - Google Patents

Abstract

FIELD: processing minerals; processing potassium ores by floatation.

SUBSTANCE: proposed method includes grinding of ore, treatment of ore by flocculant and collecting reagent, floatation of slime and potassium chloride. Used as collecting reagent for floatation of slime is polyoxyrthylene glycol esters of monoalkyl phenols which have 8-12 atoms of carbon in alkyl group and number of oxyethyl groups in radical is equal to 20-30.

EFFECT: enhanced efficiency of desliming of ore.

2 tbl, 3 ex

Description

The invention relates to a technology for processing minerals, specifically to a technology for processing potash ores by flotation.

A known method of flotation beneficiation of potash ores, including grinding and desliming of ore, classification of flotation feed by size 0.1-0.3 mm, treatment with reagents and separate flotation of potassium chloride from coarse and fine fractions of ore, while flotation of potassium chloride from ore fraction less than 0.3 mm is carried out with an amine with the addition of polyacrylamide at a ratio of 1: 0.05-0.3, or with an amine with the addition of organic hydrocarbons (OS) of the paraffinic, aromatic, naphthenic series or mixtures thereof at a ratio of 1: 0.5-3, 0 matched by the way, or together with organic hydrocarbons and polyacrylamide (RF Patent No. 2136383, IPC ⁶ 01 D 1/02, 03 D 103/10, publ. 10.09.99).

The combined addition of polyacrylamide and organic hydrocarbons increases the flotation rate, but a significant drawback of this method is the use of aromatic and naphthenic hydrocarbons, which have an increased toxicological effect on the human body and adverse environmental characteristics.

It is also known to use sludge for flotation as a flocculant of polyacrylamide and hydroxyethylated fatty acids as a collector reagent (Titkov S.N., Mamedov A.I., Soloviev E.I. “Enrichment of potassium ores”, M .: Nedra, 1982, p. 126).

The use of hydroxyethylated fatty acids as a collector reagent leads to an increased consumption of an expensive reagent - polyacrylamide.

Closest to the proposed one is a method of flotation concentration of potash ores, including ore grinding, ore treatment with a flocculant and a collecting agent, flotation of sludge, flotation of potassium chloride using primary aliphatic amines C ₁₆ -C ₁₈ as a collector. As a collector reagent for sludge flotation, ethoxylated alkyl phenols with a length of hydrocarbon radical C ₉ and the number of hydroxyethyl groups in the radical 12-20, obtained on the basis of propylene trimers, are used (RF Patent No. 2165797, IPC ⁷ B 03 D 1/008, 1/004 , B 03 D 101/02, 103/10; publ. 04/27/2001).

The positive side of the described method is the low cost of the collector reagent, a decrease in the consumption of polyacrylamide, but the use of these hydroxyethylated alkyl phenols as a collector reagent is not effective enough, especially at elevated temperatures of the mother liquor.

The objective of the invention is to develop a method of flotation concentration of potassium ores, which allows to increase the efficiency of de-sludge ore.

The problem is solved by the method of flotation concentration of potash ores, including ore grinding, ore treatment with a flocculant, a collector reagent, sludge flotation and potassium chloride flotation, while polyoxyethylene glycol ethers of monoalkyl phenols having 8-14 atoms are used as a collector reagent for sludge flotation carbon in the alkyl group, with the number of hydroxyethyl groups in the radical 20-30.

The difference between the proposed method of flotation concentration of potassium ores from the closest one is the use of polyoxyethylene glycol ethers of monoalkylphenols having 8-14 carbon atoms in the alkyl group and 20-30 hydroxyethyl groups in the radical as a collector reagent.

In the preparation of polyoxyethylene glycol ethers, monoalkylphenols use products obtained by alkylation of phenol with C ₈ -C ₁₄ olefin fractions, including propylene trimers and tetramers. The polyoxyethylene glycol ethers obtained on the basis of these monoalkylphenols have a degree of hydroxyethylation in the range of 20-30.

Polyoxyethylene glycol monoalkylphenol esters are prepared as follows.

Monoalkylphenols are mixed with a 20-36 wt.% Aqueous solution of an alkali metal hydroxide (potassium or sodium), taken in an amount providing an alkali metal hydroxide content in the monoalkylphenols supplied for hydroxyethylation in the range of 0.1-0.3 wt.%. The resulting mixture is dehydrated while evacuating and sparging with nitrogen. The process of hydroxyethylation is carried out in a batch reactor at a temperature of 160-200 ° C and a pressure of 0.4-0.7 MPa. The reaction mass is kept for 10-30 minutes, discharged into an intermediate tank, where alkali is neutralized with acetic acid to pH 7 ± 1. If necessary, carry out the drying of the obtained polyoxyethylated monoalkylphenol.

The proposed method was tested in laboratory conditions on sylvinite ore of the Verkhnekamsk deposit. In the flotation of sludge, polyacrylamide of the Akkoflok A-110 brand (made in Japan, Mitsui Saytek LTD) was used as a flocculant. After carrying out slurry flotation, sylvin (potassium chloride) is flotated by any known methods using, for example, primary aliphatic amines as a collector.

The liquid phase of flotation - a saturated solution (mother liquor) with a density of 1.235 g / cm ³ was prepared in laboratory conditions on the basis of sylvinite ore.

The implementation of the proposed method of flotation concentration of potassium ores is illustrated by the following examples.

Example 1

The ore is crushed to a particle size of less than 2.0 mm, flotation de-cladding is carried out using a monoalkylphenol polyoxyethylene glycol ether based on a C ₈ olefin fraction with a number of oxyethyl groups in the radical 20 as a collector reagent.

The test results are shown in tables 1 and 2.

Example 2

The flotation method of potassium ore dressing is also carried out as described in Example 1, but the monoalkylphenol polyoxyethylene glycol ether based on propylene trimers with the number of hydroxyethyl groups in the radical 25 is used as a collector reagent.

The test results are shown in tables 1 and 2.

Example 3

The flotation method of potassium ore dressing is also carried out as described in example 1, but the monoalkylphenol polyoxyethylene glycol ether based on the C ₁₄ olefin fraction with the number of hydroxyethyl groups in the radical 30 is used as a collector reagent.

The test results are shown in tables 1 and 2.

As can be seen from the test results, flotation deslamination using polyoxyethylene glycol esters of monoalkylphenols having 8-14 carbon atoms in the alkyl group and with the number of hydroxyethyl groups in the radical of 20-30 is more effective, especially at elevated temperatures. The extraction of insoluble residue in the draft slurry increases, the residual content of insoluble residue in the chamber product (nutrition of sylvin flotation) decreases, the increased content of which further leads to a deterioration in the technological parameters of sylvin flotation and an increase in the amount of undesirable impurities in the finished product.

Claims (1)

A method of flotation concentration of potassium ores, including grinding the ore, treating the ore with a flocculant, a collector reagent, sludge flotation and potassium chloride flotation, characterized in that polyoxyethylene glycol ethers of monoalkylphenols having 8-14 carbon atoms are used as a collector reagent for sludge flotation group with the number of hydroxyethyl groups in the radical 20-30.