SU1639762A1 - Method for coal floatation - Google Patents

Abstract

The invention relates to the enrichment of minerals by flotation and m. used in coal preparation plants. The goal is to increase the extraction of combustible mass in the concentrate while reducing the consumption of reagent. The method of coal flotation includes pre-pulping and pulp conditioning with a blowing agent collector. The vat residues of octamethyltrisiloxane (OMTS) and ethoxysilanes of composition, wt.%: 15-20; 5-10; 10-20; 10-15; 15-20, the Rest. (CH3) H5O5 (CH3) 205 (CH3) OS OSi (CH3) (CH3) (CH3) (CH3) 3 (CH3) 2 ZOC2H5 (CH3) (CH3) (CH3) Не Unidentified impurities To carry out the process, we take a sample of coal, for example, 100 g, mixed with water in a laboratory machine for 120 seconds, then a portion of the complex reagent is supplied - vat residue produced by OMTS and ethoxysilanes and contacted with coal pulp for 60 seconds. After 60 seconds of contacting the reagents with the slurry, air is supplied to the flotation machine, and then a flotation concentrate is removed for 60 seconds. This provides an increase in the extraction of the combustible mass of coal into the concentrate. 00 s

Description

This invention relates to the enrichment of minerals by flotation and can be 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 reagent.

The method of coal flotation includes preliminary pulping and pulp conditioning with a collector by a blowing agent.

with the subsequent separation, as a complex reagent for the collector-foaming agent, the VAT residue of the production of octamethyltrisiloxane of OMTS and ethoxysilanes is introduced into the process.

VAT residue production of OMTS and ethoxysilanes has a composition, wt.%:

(SNZ) (OCHN) 2051 (SNZ) s 15-20 tOSi (CH3) 2 45-10

(SNZ) (SNZ) (SNZ) s 20-10

o sooo

xl o

go

(CH3) 2 ZOS2N5YU-15

(SNZ) (SNZ) (SNZ) s 20-15

Unidentified

impurities

Physico-chemical characteristics

Tktsts, ° С130-230 (760 mm. Hg)

ho.

OD

20

1.3930-1.3950

oVu0.8850-0.8900

Example. To carry out the process, we take a portion of coal, for example, 100 g, mix it with water in a laboratory machine of the Mechanobr type with a chamber volume of 0.75 liters for 120 seconds, then serve a portion of the complex reagent — the vat residue produced by OMTS and ethoxysilanes and contact it with coal. pulp for 60 s. After 60 seconds of contacting the reagents with the pulp, air is supplied to the flotation machine, and then a flotation concentrate is removed for 60 seconds. The air supply to the pulp is stopped and the next portion of the complex reagent is supplied, followed by their contacting with coal for 60 s. After contact of the coal sample with reagents, air is poured into the pulp and the second concentrate is removed, the total consumption of reagents and the amount of dosing into the pulp is determined by their flotation activity.

Using the bottom residue produced by OMTS and ethoxysilanes as a complex reagent instead of tractor kerosene with bottom residues of butyl alcohols makes it possible to increase the extraction of hot mass into concentrate from 78.5-92.7 to 91.3-93.8% while reducing the consumption of reagent from 0.565-0.900 to 0.360- 0.480 kg / ton.

The improvement in coal flotation using bottom residues from OMTS production and ethoxysilanes is explained by the elemental composition and structure of their molecules. In organosilicon ether molecules, electron density localization takes place on oxygen atoms, and as a result, the reagents can interact specifically with the adsorption-active centers of the carbon surface bearing positive charge (protonized hydrogen atoms of the phenol, carboxyl groups in the macromolecule organic mass of coal) according to the scheme

fI

R-0 - (Si-O) n-Sl-O-R

n + 1n + b

In the organosilicon molecules, there are hydrocarbon radicals that can interact with the apolar centers of the coal surface due to the intermolecular forces of Wander-Waals. Therefore, in the case of adsorption on coal

The surfaces of aliphatic and cyclic organosilicate esters appear simultaneously both as specific (H-bonds, etc.) and universal non-specific intermolecular forces of interaction with positive and apolar portions of the coal surface. In this case, the organosilicon compounds are very good water-repellent mineral surface adsorption,

which has a positive effect on their flotation activity. The presence of oxygen atoms in the organosilicon molecules contained in the bottoms of OMTS and ethoxysilanes gives them a high

surface activity. The high polarization of the reagent molecules, caused by the electron-acceptor properties of oxygen atoms, causes good foaming properties). High

hydrophobic activity and good foaming properties of the bottoms produced by OMTS and ethoxysilanes ensure their high flotation properties.

Therefore, the use of bottoms from the production of OMTS and ethoxysilanes as a complex reagent during flotation makes it possible to increase the recovery

combustible mass in concentrate from 78.5-92.7 to 91.3-93.8% with a simultaneous decrease in reagent consumption by 1.5-2.0 times.

40

Claims (1)

Invention Formula The method of coal flotation, including pulping, conditioning with a blowing agent collector, and expelling coal into a concentrate differing from that. that, in order to increase the recovery of the combustible mass of coal, the bottom octamethyltrisiloxane and ethoxysilanes composition, in wt.%, are used as collector-foaming agent: (СНз) з8Ю81 (СНз) 2081 (СНз) з15-20 OSi (CH3) 2 45-10 (CH3) (CH3) (CH3) s 10-20 (CH3) 2 ZOC2N5U-15 (SNZ) (SNZ) (SNZ) s 15-20 Unidentified . impurities