The preparation of the raw materials before the ball is very important, it determines whether the next ball making work is smooth, and thus affects the quality of the product. Raw material preparation includes: chemical composition control, particle size control, moisture control, etc.
The operation of the blast furnace requires that the raw material composition is stable, and the stability of the pellet component is based on the premise that the composition of the pelletizing material is stable. It is necessary to control components of the pelletizing material, specific measures are: First, the requirements from the beneficiation plant concentrate composition and stability, and if necessary in the pellet plant. In order to improve the neutralization effect, there must be sufficient stock of raw materials, for which there should be a large-capacity neutralization silo or a neutralization tank. In addition, the raw material must be strictly managed, and according to the procedures, careful operation, if the work well, can fluctuate containing iron pellets is within ± 0.5% of.
The particle size of the raw material has a great influence on the quality of the pellet, the quality of the raw ball and even the quality of the finished product. China's pellet plant generally requires iron concentrate size -200 mesh to be greater than 80%. In terms of specific surface area, it should be 1500cm 2 /g or more, and foreign requirements are stricter. If the particle size does not meet the requirements, it should be ground. There are two types of grinding, dry and wet. The flow is shown in the figure below. The wet grinding process is as follows: the coarse-grain concentrate and water are ground in a ball mill or a rod mill. After passing through the classifier, the qualified person sends it to the filter, and the unqualified person returns to the re-grinding. The advantage of wet grinding is that the working conditions are better, but the water consumption is large. For some minerals, it is difficult to filter and dewater after grinding, the water content of the concentrate is higher than the requirements of pelleting, and the drying process must be increased. Therefore, some foreign manufacturers use dry grinding, the coarse-grained ore powder is first dried, then into the mill, the wind classifier, and then the qualified ore powder is sent to the ball, and the unqualified size returns to re-grind.
If limestone and marble are added to the ingredients, they should be ground. The flux with too coarse particle size is not only unfavorable for dry ball formation, but also causes huge pores in the pellets and affects its strength. Therefore, the particle size of the flux should be thinner than that of iron ore powder.
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1. We have been a professional OEM/ODM Metal Stamping (Aluminum,stainless steel,Copper ,SPCC,SGCC and so on) manufacturer for 30 years in China. 2.Products application: Consumer electronic hardware accessories such as telecommunication aluminum cavity,LED Lighting aluminum housing,Setup box housing,power adapter case ,UPS power housing,STB box,AMPLIFIERS chassis and panel LED driver case ;Thermal solution heat sinks&radiator;Computer hardware accessories;Furniture hardware parts,home appliance etc.
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