A processing process that converts finely ground concentrate into materials that meet smelting requirements. The process involves mixing the prepared materials in a certain proportion, rolling them on a granulator to create a certain size of green balls, and then using drying, calcination, or other methods to cause a series of physical changes and harden and solidify them. This process is called pellet process, and the product is called pellet ore. The mixture of concentrate powder and flux is rolled into green balls in a pelletizer, then dried, calcined, and solidified into iron containing raw materials with good metallurgical properties, which are supplied to the needs of steel smelting. The main production processes of pellet method include raw material preparation, ingredient mixing, pelletizing, drying and calcination, cooling, finished product and return ore treatment, etc.

The main raw materials for pellet production are concentrate powder and additives. If solid fuel is used for calcination, there are also coal powder and coke powder. The purpose of sintering material mixing and granulation: The mixing operation is to evenly distribute each component and reduce segregation; Moisturize the material evenly with water, ensuring stable moisture content; Preheat materials and increase material temperature; Produce particles with appropriate particle size to improve the permeability of the sintered material layer.

The mixing time is related to the length, speed, and inclination angle of the mixer. Increasing the length of the mixer undoubtedly prolongs the mixing and granulation time, which is beneficial for mixing and granulation. The speed of the mixer determines the movement status of the material inside the cylinder. If the speed is too small, the centrifugal force generated by the cylinder is relatively small, making it difficult for the material to reach a certain height, forming a stacked state, and the mixing and granulation efficiency is low; But if the rotational speed is too high, the centrifugal force generated by the cylinder is too large, causing the material to adhere tightly to the cylinder wall, resulting in the complete loss of mixing and granulation effects of the material.

The inclination angle of the mixer determines the residence time of the material inside the machine. The larger the inclination angle, the shorter the mixing time of the material, and the worse the mixing and granulation effect. When a cylindrical mixer is used for primary mixing, its inclination angle should be less than 2.0 °, and when used for secondary mixing, its inclination angle should not be less than 1.5 °.

The design of the Sinotech Science and Technology hybrid granulator meets the requirements of producing pellets. The equipment is a tilting machine, with a tilting angle that meets the optimal angle for uniform material mixing. It is convenient for feeding and discharging, and there will be no problem of large accumulation of material in the barrel. Its unique design can independently change the component speed, and adjust the speed according to the material speed requirements to achieve the best mixing degree of the material, avoiding material accumulation, The problem of poor mixing granulation effect and insufficient mixing granulation due to excessive rotation speed. Its design structure is scientific, with minimal maintenance and wear of accessories, and the scraper inside the equipment can achieve sufficient unloading of materials.

In addition, the filling rate of the mixer also affects the mixing and granulation effect of the mixture, and the filling rate is expressed by the volume of the mixture in the cylinder. The filling rate is too low, the yield is low, and the interaction force between materials is small, which is unfavorable for mixed granulation; Excessive filling rate can increase production when the mixing time remains constant, but due to the thickening of the material layer, the movement of the material is restricted and damaged, which is unfavorable for mixing and granulation. The appropriate filling rate for the first mix should be around 15%, while the filling rate for the second mix should be lower than that for the first mix. When the lining inside the mixer is insufficient, the amount of water added should be increased to increase the surface water of the mixture (water is directly added to the material surface). When the mixer has too much sticking, the amount of water added should be reduced.

The inner wall of the cylinder should not have too much material hanging on it. It should be cleaned during shutdown to maintain good mixing effect and ball making ability.

The start and stop of moisture during material changing and buffering must be controlled appropriately to avoid the phenomenon of "dry material" and "wet material" being applied.

Suitable for the preparation of metallurgical sintering mixtures and pellets, as well as the recovery and utilization of iron containing dust, sludge, and slag dust in steel mills and non-ferrous smelters

◎ Improve the permeability of sintered materials

◎ Improve the ball forming rate and increase the green ball strength

◎ Reduce the usage of bentonite

◎ Reduce the usage of coke powder

◎ Increase production and save fuel, improve profit margins