Raw coal briquetting machine for the selection of binder to correctly grasp several principles

The whole industry of raw coal ball press, except desulfurization gypsum ball press, ball pressing does not need to add any binder, once formed, and the ball formation rate reaches more than 95 percent. Like other materials: mineral powder, coal, coal powder, iron powder, coking coal, aluminum powder, iron scrap, iron oxide, carbon powder, carbon powder, slag, gypsum, tailings, sludge, kaolin, activated carbon, coke and other kinds of powder, powder, waste, slag and so on. How can the raw coal briquetting machine be without binder to ensure the ball rate?

The binder is an important part of coal making, it is not unchanging, it is adjusted and perfected with the change of raw coal composition.

In the process of pressing pellets, the binder should be selected according to the following principles.

Stability of raw coal and coal quality composition: quality standard of binder composition and material (content, moisture, fineness); binder proportioning, fluidity and permeability of binder; influence of binder preparation process, mixing method, mixing time, mixing process temperature on binder molecular chain. The relationship between binder addition ratio and addition method and moisture of raw coal. According to the characteristics of gas making coal index, humic acid binder is commonly used: humic acid binder has strong affinity to coal powder through physical and chemical reaction. High surface activity, inclusion and permeability. Good reaction activity, improve the combustion reaction, gas composition, gas generation and consumption of coal type in the furnace. Improve the reaction speed and gas conversion efficiency of coal type in the process of combustion and vaporization.

Composition and proportioning ratio: depending on the physical and chemical indexes of carbon content, moisture, ash melting point and volatile fraction of raw coal, it is generally composed of liquid binder and dry powder additive 1:10:50, but the 10 in the proportioning ratio is taken from the content of humic acid in raw coal, not the quantity of raw coal.

Preparation process: The humic acid content of lignite is generally required to be 40-50%. Grind it into 100 - 120 mesh fineness to improve the wetting power, expansion power and penetration power. After adding water to the reaction kettle, heat it up to 40 degrees, add hydroxide na, stir it well, continue to heat it up to 90 degrees, add humic acid, stir it for 1.5-2 hours, and use it when the temperature does not exceed 95 degrees. Adding ratio: generally about 5%. Adding method: metering valve and dry powder spiral quantitative feeder, accurate measurement.