SU1319907A1 - Method of coal and graphite flotation - Google Patents

Abstract

The invention relates to mineral mineral processing technology and allows for enhanced recovery of the valuable component and concentrate quality. The feedstock is preconditioned with a collector and a blowing agent, and then flotation is carried out. The product of alkaline hydrolysis of brown coal is introduced as a collector. The products of alkaline hydrolysis of brown coal are represented by high molecular weight polyfunctional tuminic acids, whose structure has not been established. Humic acids were extracted by treating brown coal with 0.5N. solution of caustic on Tr. Humic acids were studied by the methods of elemental and functional analyzes, IR spectroscopy, NMR s, EPR spectroscopy. Results of elemental analysis;%: C, 53.70; H 4.85} N U, 49; S 4.43; About 35.53. Results of functional analysis,% total acidity 12.38; COOH 9.24; HE, p (, „3.14; CO 4.25. The use of this reagent makes it possible to reduce the ash content of the concentrate by 2.43% during the flotation of coal sludge; to increase the degree of combustible mass absorption by 5%, and the yield of the concentrate by 14, 7%. I (Л С

Description

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This invention relates to a process for the beneficiation of minerals and can be used in the flotation concentration of coal sludge and graphite ore.

The aim of the invention is to improve the extraction of the useful component and the quality of the concentrate.

The flotation of coal sludge and graphite ore is carried out with the replacement of the kerosene collector by the collector obtained by alkaline hydrolysis of brown coal.

The alkaline hydrolysis products of brown coal are high molecular weight polyfunctional humic acids, whose structure has not been established.

Humic acids are recovered by treating brown coal with 0.5N. sodium hydroxide solution. The isolation is carried out as follows. A glass vessel is crushed with 1 kg of coal, ground in a ball mill to a particle size of 0.1 mm, and 3 liters of 0.5 N are poured. caustic soda solution. After 24 hours, the residue is filtered off and the coal is refilled with 0.5N. After filtering, the humic acid solutions are combined and the solution is acidified to pH 2 with 15% hydrochloric acid. The humic acids precipitated are filtered off, taken from hydrochloric acid with distilled water and dried in a drying cabinet at 70 C. The yield of humic acids on the organic mass of Mugun coal - 30.7%.

For flotation, solutions of humic acids in an alkaline aqueous medium (1%) are prepared, with a pH of 9. For flotation, solutions of humic acids can be used without their prior precipitation, i.e. directly solutions of humic acids in 0.5 n. caustic soda solution, obtained after processing the carbon with an aqueous solution of alkali.

Humic acids were studied by the methods of elemental and functional analysis, IR spectroscopy, C and EPR NMR spectroscopy.

The results of elemental analysis,%: 53,70; H 4.85; N 1.49; S 4.43; 35.53.

Results of functional analysis,%: total acidity 12.38; COOH, 24; 3.14; CO 4.25.

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IR spectra of humic acids are recorded on a Specord instrument in tablets with KBr. The spectra have bands characterizing hydroxyl groups, 5 linked by hydrogen bonding in the region of 3300-3600, the bands corresponding to vibrations of aliphatic CH and CH,

one

groups at .2850 and 2920 cm, carbonyl bond absorption bands

  at 1700 cm, intense streaks

 bonds of aromatic and olefinic systems and absorption bands in a wide range of 1100-1400, characteristic of C-0 bonds of ethers and esters. In general, the data of IR spectra confirm the results of elemental and functional analyzes.

NMR spectra With register on the spectrometer Bruker WP-200SY. Samples were prepared in the form of 25% solutions of humic acids in deutero water, to which 2% KaOD was added. In the analysis

NMR spectra with obtain quantitative data characterizing the degree of aromaticity fa and the distribution of carbon and oxygen by functional groups in humic acids: fa 0.34; ten%; 7.3% (carbon content); 25; 9%, 9.7% (according to the oxygen content). From the comparison of the data of functional analysis, determined by chemical methods and NMR C method,

that humic acids have a high oxygen content in ester groups and is about 16%. In addition, the NMR spectra qualitatively characterize the aliphatic part

organic matter of humic acids, which is represented by short highly branched bridging structures between aromatic fragments. The study of humic acids by EPR spectroscopy showed a high concentration of napaMaj - nitric centers, equal to 4.8 g x 10. The width of the EPR signal is 6 Gs, the signal is singlet, no anisotropy of the signal is observed. This allows us to conclude that the para-magnetism of humic acids is due to a developed conjugation system, to the extent of aromatic fragments.

oxygen-containing radicals of the seven-quinone type can also be included.

The method is carried out as follows.

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The ore and sludge are crushed, modifiers and pH regulators are introduced, and then the products of alkaline hydrolysis of brown coal and a blowing agent are introduced into the air conditioning system and floated.

Example. Tests were carried out on coal slime of the Cheremkhovo deposit and talc-graphite ore. The original coal slurry containing 13.3% of clay and 20.7% of mineral impurities was ground in a ball mill to 0.2 mm. The initial talc-graphite ore of 3 mm size was ground in a ball mill to 0.8 mm. The grinding of rough concentrates in stages II and III was carried out up to 0.5 and 0.2 mm also in a ball mill. The main flotation of coal slurry and talc graphite ore was carried out in a mechanical mechanic machine with a chamber volume of 1000 ml. These operations were carried out in a machine of the same type, but with a smaller volume.

Optimal results in the flotation of coal slurry with kerosene were obtained with a kerosene consumption of 2-10 kg / kg. The ash content in the concentrate is 13.33%, the degree of extraction of the combustible mass is 92.6%. Optimal results in flotation of graphite ore with kerosene were obtained at a flow rate of 35–10 kg / kg. The ash content in the concentrate is 12.7%, carbon recovery is .90.25%.

The experiments on the replacement of kerosene with humic acid reagent during the flotation of coal slurry differ from the basic ones by the substitute consumption and the lack of supply of the reagent to the control flotation. In the main flotation collector - humic acid - served in quantities from 5-10 to 18 10 kg / kg alternately.

Compiled by V. Shubin Editor A. Lezhnin Tehred V. Kadar Proofreader G. Reshetnik

Order 2549/7 Circulation 511 Subscription

VNIIPI USSR State Committee

for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab., 4/5

Production and printing company, Uzhgorod, st. Project, 4

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Humic acids can be used as a substitute for kerosene in the flotation of coal sludge (consumption of humic acids 12-LO kg /

/ kg). The yield of the concentrate is 88.8%, the ash content of the concentrate is 10.9%, and the degree of extraction of the combustible mass is 97.6%. In the flotation of graphite humic ore, the experiments differ only in the consumption of humic acid. In I, the main flotation is fed from 2 10 to A lO kg / kg of humic acid variably, in the II main flotation - 15-10 kg / kg, in the III main flotation

flotation - 710 kg / kg. Optimum results are observed when humic acid is consumed in the I main flotation kg / kg. At the same time, graphite concentrate contains ash 6.21%

when extracting carbon 93.69%.

The analysis of the obtained results of g indicates that it is possible to replace kerosene with humic acid both in the flotation of coal slurry and in

flotation of graphite ore. During the flotation of coal sludge, the ash content of the concentrate decreases by 2.43%, the degree of extraction of the combustible mass increases by 5%, the yield of the concentrate increases

by 14.7%. The quality of the graphite concentrate is also improved, carbon recovery is increased by 3.44%, the ash content of the concentrate is reduced by 6.5%.

Claims (1)

Formula of Invention The method of flotation of coal and graphite, including preconditioning of the raw material with a collector and blowing agent, characterized in that, in order to increase the extraction of the useful component and the quality of the concentrate, the product of alkaline hydrolysis of brown coal is introduced into the air conditioning system.