Method for preparing special binder for bituminous coal briquette with not more than 20% of volatile components

Abstract

The invention discloses a method for preparing a special binder for bituminous coal briquette with not more than 20% of volatile components. The method comprises the steps of: weighing the materials by weight percent: 15-20% of sodium carbonate, 25-30% of sodium silicate, 4-6% of corn starch, 1-2% of polyurethane, 21-27% of grog refractory, 20-26% of aluminate cement, 1-2% of industrial salt, and 1-2% of complexing agent. The method comprises the steps of: putting the materials into an agitation vat to mix and agitate for 10-30 minutes; then grinding, packaging and sealing to prepare a binder product. The binder prepared by the method is coal briquette prepared from bituminous coal dust with not more than 20% of volatile components such as meagre coal, lean coal, non-caking coal and the like; the coal is low in gelatinous layer, and small in bonding index; the prepared coal briquette is high gasification heat stability, and suitable for a lurgi furnace or a single-section furnace to prepare the gas. The fixed carbon of the coal briquette prepared from the gas-making coal briquette binder is not reduced; the method is low in cost, simple and convenient to operate, and significant in economic benefit and social benefit.

Description

technical field [0001] The invention relates to the technical field of coal combustion, in particular to a preparation method of a special binder for briquette-making by using bituminous coal powder with a volatile content of ≤20%. Background technique [0002] Briquette is a coal product with a certain strength and shape made of pulverized coal or low-grade coal; binder is a glue that is added to pulverized coal for bonding when pulverized coal is used to make briquettes. The definition standard of bituminous coal and anthracite is based on the difference between high and low volatile content. The volatile content is less than 10%. Bituminous coal is bituminous coal. The degree of coalification of bituminous coal is lower than that of anthracite but higher than that of lignite. It is characterized by a wide range of volatile matter yields. When coking alone, there is no coking to strong coking. There is smoke when burning. The volatile matter of lignite bituminous coal is s...