Study On Preparation And Physical And Chemical Properties Of High Carbon Containing Pellets

The usage and preparation of high carbon-bearing pellets are firstly introduced in this article. Under the condition of high temperature, iron can be reduced from the high carbon-bearing pellets. This kind of pellets can not only be used to make iron in blast furnace, make steel in the electric-arc furnace, but also treat waste water discharged by the coke-oven plant. In this research, high carbon-bearing pellets are mainly used in treating waste water.Three kinds of pellets are mainly studied in this research, they are common high carbon-bearing pellets, different center and cover high carbon-bearing pellets and porous diatomite high carbon-bearing pellets. The research shows that result of high carbon-bearing pellets in dealing with waste water is better than both iron and scrap. However, the strength of the pellets needs to be improved.The raw materials of common pellets include iron ore powder, breeze, addition1, addition2 and addition3. Because of the low price of the addition3, this experiment depends on the high content of addition3 to improve the strength. Pellets are produced in disk pelletizer and they are roasted under the temperature of 1050℃,1100℃,1150℃and 1200℃respectively. The result shows that pellets that containing 20% addition3 and roasted under the temperature of 1200℃have higher strength and treating ability than other pellets.The electrochemical properties are studied by IM6e electrochemical workstation, taking the waste water from Tang Steel Coke plant as subject. Corrosion potential and current of different ratio, roasting temperature and reaction time have been compared. Results show that the best roasting temperature, reaction time and iron-carbon ratio are 1200℃, 90min and 1:2 respectively.In order to make a further improvement of the pellets'strength and treating ability, pellets with different center and cover and porous diatomite are also been studied. Results show that porous diatomite pellets containing 10%~20% diatomite have better strength and treating ability.The results of experiment show that treating ability of these improved high carbon-bearing pellets is very satisfying. It possesses the advantages as follows: long life, widely achieved row material, low cost and easy automation. So it has a real significance to our study.