Quality control of self-made briquette binders

Process flow for preparing sodium humate adhesive: Lignite → crusher → addition of water and soda ash, followed by the introduction of steam while stirring continuously in the extraction tank – ready for use. Sodium humate, used as a binder for coal pellets (formed products), can be easily compressed into shape after being mixed with coal dust and left to soak for a period of time. The adhesion can withstand temperatures of 1360°C; the adhesive itself is a type of coal, and the amount added does not cause significant changes in the fixed carbon content of the briquette. Since the fixed carbon content in coal briquettes is one of the main factors that directly affect the gas output of gas stoves, for coal briquettes, the higher the fixed carbon content, the better. The level of adhesive content and the quality of the adhesive are key factors determining the quality of coal rods. Alkali or caustic soda solutions are used to extract humic acid contained in lignite; through neutralization with acid, it is converted into sodium humate, which is then dissolved in water to serve as a binder. The chemical reaction equation is as follows: ； R(COOH)n + nNaOH → R(COONa)n + nH2O. Through a double-displacement reaction, humic acid is converted into its sodium salt, which dissolves in water, while carbonate ions combine with calcium ions to form calcium carbonate precipitate. For peat, to prevent the dissolution of lignin, Na2CO3 is an ideal extractant for peat humic acid. The mixing ratio should be determined based on the humic acid content of lignite. Add water first, then alkali; turn on the steam and stir while heating to 90 ℃, then add lignite and stir for 2 hours. Generally, 0.8 tons of lignite and 50 kg of soda ash are added per cubic meter of water ； For every 100 tons of raw coal, use 4 tons of lignite containing more than 30% humic acid ； The adhesive should be used promptly once it has been prepared. The amount of humic acid binder added varies depending on the properties of the raw materials. Sodium humate solution must be at a certain concentration to be effective; a solution that is too dilute acts merely as a surfactant. The extracted sodium humate solution should be brown in color, sticky to the touch, without a noticeable alkaline slipperiness; when a stick is inserted into it, the adhesive will flow slowly down the stick upon removal.

Thank you. I currently have a coal rod project and need information in this area

This post was last edited by *aoye613 on 2009-6-6 10:41. The second floor’s comment is good and quite detailed, but it’s not clear whether it’s suitable for making coal balls.