PL177959B1 - Method of modifying coal briquetting compositions - Google Patents

Abstract

The method of modifying coal briquette mix by mixing fine-grained coal material with starch-type binders, molasses, waste sulphite liquor or beech wood hydrolysate and synthetic resin, whereby, to known coal mixtures with binders, there is added the mixture of resins in the amount of 0.3-6 percent composed of polyvinyl acetate in the amount of 40-70 percent, methyl polyacrylate in the amount of 7-27 percent, and poly (dibutyl maleate) in the amount of 13-33 percent, or the composition of these resins with latex dispersions, where the content of latex dispersions may not exceed 50 percent by weight; to such a briquette mix, before briquetting, known stabilisers and adhesion-enhancing agents are added.

Description

The subject of the invention is a method of modifying the carbon briquette mixture intended for the production of ecological carbon briquettes.

Briquetting is a process used to expand the fuel base with fine-grained coal and coke breeze materials. Until now, in the process of agglomeration of fine-grained materials, residues from the distillation of tar and crude oil have been used as a binder. However, during combustion, these products released significant amounts of compounds harmful to living organisms.

It is also possible to use substances such as starch, molasses, sulphite lye, beech hydrolyzate as a binder. The use of these binders is limited, however, due to the fact that the briquettes obtained with their use are characterized by low mechanical strength and lack of water resistance.

It is also known to use synthetic resins such as phenol-formaldehyde or urea-formaldehyde as binder. briquettes based on these adhesives, however, emit significant amounts of toxic substances.

The object of the invention is to obtain a briquetting mixture based on a starch binder and a mixture of synthetic resins, which, when briquetted, gives a formed fuel with satisfactory initial and final mechanical strength and insoluble in water.

The essence of the method according to the invention consists in the fact that a mixture of resins in the amount of 0.3 - 6%, consisting of polyvinyl acetate in the amount of 40 - 70%, poly methyl acrylate in the amount of 7 - 27% and dibutyl polymelate is added to the known carbon mixtures with a binder. in an amount of 13-33%, or the composition of these resins with latex dispersions, the content of the latex dispersions must not be higher than 50% by weight. Prior to its briquetting, known stabilizing and adhesion-increasing agents are added to the modified briquetting mixture.

The method of modification of the carbon briquetting mixture according to the invention is illustrated in the examples.

Example 1. Coke breeze, steam coal, sintering coal were mixed in the ratio 2: 1: 1. The obtained mixture with a grain size of 3 mm in the amount of 93.9% was combined with 4% starch, and then water in which 0.1% phosphoric acid at 86% concentration was previously dissolved was added. The whole was heated to a temperature of 100 ° C and simultaneously mixed in a blender. Then the whole thing was directed to the mixer where, during intensive mixing, 2% of the resin mixture composed of:

polyvinyl acetate 4.3% poly methyl acrylate 2.5% dibutyl polymelate 32%

ΥΠ 959 as a solution. The obtained briquetting mixture was directed to a roller press. Raw briquettes were dried at 100 ° C. The obtained briquettes have high mechanical strength when dry and do not lose their strength under the influence of weather conditions - rain, high atmospheric humidity, which is indicated by water resistance.

Example 2. A mixture of 50% coke breeze, 50% steam coal and grain size up to 3 mm in an amount of 94% was mixed with 4% modified starch and water was added. Then, a 2% solution of the resin mixture was introduced into the mixture with the following composition:

polyvinyl acetate 50% poly methyl acrylate 20% dibutyl polymelate 30% stabilizing and adhesion promoting agents (e.g. ethylene oxide copolymers, higher fatty acid salts) in amounts of 0.5% with respect to the resin composition. Everything was thoroughly mixed in the mixer. The obtained briquetting mixture was briquetted on a roller press. The obtained briquettes, after drying, are characterized by high mechanical strength when dry and do not lose their strength under the influence of weather conditions - rain, high atmospheric humidity, which indicates their water resistance.

Example 3. 94% steam coal was mixed in a blender with 4% modified starch and water. then added as a solution of a 1% mixture of resins with the following composition:

polyvinyl acetate 66% poly methyl acrylate 15% dibutyl polymelate 25% stabilizing and increasing agents (e.g. ethylene oxide copolymers, salts of higher fatty acids) in amounts of 0.4% based on the resin composition and 1% latex dispersion.

Everything was thoroughly mixed in the mixer. The obtained briquetting mixture was briquetted on a roller press. The obtained briquettes, after drying, are characterized by high mechanical strength in a dry state and do not lose their strength under the influence of weather conditions - rain, high atmospheric humidity, which indicates their water resistance.

177 959

Publishing Department of the UP RP. Circulation of 70 copies. Price PLN 2.00.

Claims (1)

Patent claim A method of modifying the carbon briquetting mixture consisting in mixing fine-grained carbon material with starch-type binders, molasses, sulphite liquor or beech hudrolysate and a synthetic resin, changing the way that a mixture of resins in the amount of 0.3 - 6% is added to known coal mixtures with a binder. is made of polyvinyl acetate in the amount of 40-70%, polymethylacrylate in the amount of 7 - 27% and dibutyl polymelate in the amount of 13-33% or a composition of these resins with latex dispersions, the content of latex dispersions must not be higher than 50% by weight, and known stabilizing and adhesion-enhancing agents are added to the thus modified briquetting mixture before briquetting.