Abstract:The coke powder has high fixed carbon and high calorific value.It can be used to prepare briquette instead of loose coal for civil cooking and heating.However, the coke powder has the characteristics of low volatile content and poor cohesiveness.This paper uses NaOH solution pretreatment to improve natural wheat straw, and activated magnesium slag are used as binders to prepare briquette by cold pressing with a tablet press.It is obtained through orthogonal experiment that the dosage of modified wheat straw is the most important factor affecting the compressive strength and falling strength.After comprehensive consideration, the best preparation process parameters are 20% of modified wheat straw, modification temperature 75℃, and NaOH concentration 2.5%, the amount of magnesium slag is 5%, the molding pressure is 30 MPa, and the amount of water added is 10%.SEM and FTIR analysis show that after the modification of wheat straw, some aromatic compounds and other viscous substances are dissolved on the surface of the wheat straw, and intermolecular hydrogen bonds are widely formed.The exposure of internal fibers increased the mechanical meshing force between the components.Staggered winding can transfer stress in the radial and axial directions;after activation of magnesium slag, the surface vitreous structure is broken to produce viscous sodium silicate;the hydrophilicity of magnesium slag helps to fully infiltrate the coke powder and binder and maintain the molecules.The existence of hydrogen bonds between.The composite binder can tightly agglomerate the components in the briquette to form a firm skeleton structure, so that the briquette has good compressive strength and falling strength.