SU1660754A1 - Method of coal flotation - Google Patents

Abstract

The invention relates to the enrichment of minerals and m. used in coal preparation plants. The purpose of the invention is to increase the recovery of the combustible mass into the concentrate while reducing the consumption of reagents. The pulp is pulped, treated with a complex reagent by a collector-blowing agent, as which the ester-4-metal-hydroxymethyl-1,3-dioxolane of the formula @ is introduced. The reagent has a high water-repellent ability and good foaming properties. The use of 4-metal-oxymethyl-1,3-dioxalane as a complex reagent makes it possible to increase the extraction of the combustible mass in the concentrate from 82.3-94.8 to 90.4-9,, 6% while reducing the consumption of reagents in 1.5 times compared with the use of tractor kerosene with T-80.

Description

The invention relates to the field of mineral processing by flotation and can be used in coal processing plants.

The purpose of the invention is to increase the extraction of the combustible mass in the concentrate while reducing the consumption of reagent.

The coal flotation process involves pre-pulping. conditioning the pulp with a collector and blowing agent and the subsequent separation of the combustible mass into a concentrate. As a complex collector-blowing agent reagent, a 4-metal-hydroxymethyl-1,3-dioxalane ether formula of mass formula is introduced into the process in a concentrate while reducing the consumption of reagents. The coal is pulped, treated with a complex collector-blowing agent, in which ether-4-metal-0-hydroxymethyl-1,3-dioxalane of the formula is introduced

CH ₂ —CH ₂ OCH ₂ C = CH ₂ O 0 CH ₃ sn ₂

The reagent has a high water-repellent ability and good foaming properties. The use of 4-metal-hydroxymethyl-1,3-dioxalane ether as a complex reagent makes it possible to increase the extraction of combustible mass into concentrate from 82.3-94.8 to 90.495.6% while reducing the consumption of reagents by 1.5 times compared to using tractor kerosene CT-80.

SU1660754 A1 p · —CH ₂ OCH ₂ C-CH2 0 ^ O CH ₃

4-Methyl-hydroxymethyl-1,3-dioxalan is prepared by reacting 4-hydroxymethyl-1,3-dioxalan with metal chloride under interfacial catalysis.

Example. To carry out the process, a sample of coal, for example, 100 g, is taken, mixed with water in a laboratory machine of the Mechanon type with a volume of 0.75 l for

120 s, then a portion of the complex reagent, 4-metal-hydroxy3 methyl-1,3-dioxalane ether, is fed and contacted with coal pulp for 60 C. After 60 s of contacting the reagents with pulp, air is fed into the flotation machine, and then flotation concentrate is removed within 60 s.

The air supply to the pulp is stopped and the next portion of the complex reagent is fed, followed by contacting them with coal for 60 s.

After contacting a sample of coal with reagents, air is supplied to the pulp and a second concentrate is taken, the total consumption of reagents and the number of dosages in the pulp is determined by their flotation activity.

The use of 4-metal-hydroxymethyl-1,3-dioxalane as an ether complex reagent instead of Tractor Kerosene with T-80 allows increasing the extraction of combustible mass in concentrate from 82.3-94.8 to 90.4-95.6% at at the same time reducing the reagent consumption from 1,000-1,560 to 0,700-0,980 kg / t.

The improvement in coal flotation using 4-metal-hydroxymethyl1,3-dioxalan is explained by the elemental composition and structure of their molecules.

In the molecules of ethers, the electron density is localized on oxygen atoms; as a result, the reagents can specifically interact with sorption, Sno-active centers of the coal surface that carries a positive charge (protonized hydrogen atoms of phenolic, carboxyl groups in the macromolecule of the organic coal class), according to the scheme

There are hydrocarbon radicals in the molecules of ethers, which can interact with the apolar centers of the coal surface due to the intermolecular forces of Van der Waals. Therefore, in the case of adsorption of aliphatic and cyclic ethers on a carbon surface, both specific (H-bond, etc.) and universal non-specific intermolecular forces of interaction with positive and apolar parts of the coal surface are simultaneously pro-5. 10 It should be noted that the presence of oxygen atoms in the ether molecules contained in 4-metal-hydroxymethyl-1,3-dioxalanes gives them high surface activity. High polarization reactant molecules 15 caused by the electron-acceptor properties of the oxygen atoms _{of the} causes • good foaming properties.

The high hydrophobization activity and good foaming properties of 4-metal-hydroxymethyl-1,3-dioxalan ensure its flotation properties.

Consequently, the use of 4metallyl-oxymethyl-1,3-dioxalane ester as a complex reagent for coal flotation allows increasing the extraction of combustible mass into concentrate from 82.3-94.8 to 90.495.6% with a simultaneous decrease in the reagent consumption by 1.5 times.

Claims (1)

30 claims A method of coal flotation, including pulping, conditioning the pulp with a collector and a blowing agent, and isolating a combustible mass into a concentrate of 35 tons, in which, in order to increase the extraction of a combustible mass into a concentrate while reducing the consumption of reagents, they introduce 4-metal-hydroxymethyl-1,3-dioxa 40 lan of the formula N _g s | ^With H —CH ₂ —O — CH ₂ —C = CH ₂ ° z ° CHj 45 CH ₂ Compiled by E. Tarasova Editor S. Baker Tehred M. Morgenthal Corrector M. Demchik Order 2074 Circulation 338 Subscription VNIIIPI of the State Committee for Inventions and Discoveries at the State Committee for Science and Technology 113035, Moscow, Zh-35, Raushskaya nab., 4/5 Production and Publishing Combine Patent, Uzhgorod, 101 Gagarin St.