Study And Application Of Cold-Forming Binder For Coke Powder And Mechanism Analysis

Coke powder is a byproduct generated in metallurgy, calcium carbide industry and chemical industry when crushing, transporting, producing and exploiting activities were carried out. The particle size of coke powder is usually too small to meet the producing requirement, impeding coke powder from marketing, with which price is about1/3of coke upmost. An additive binder can be applied in the cold forming of coke, which is able to replace coke in real production. Comparing with the input, this cold-forming additive is able to raise the practical value of coke powder and save energy, thus cost as a whole goes down. Furthermore, the severe fugitives dust pollution resulted from deserted coke powder heap can be addressed.In this study, coke powder was raw material and industrial mo lasses serves as binder; through the dosing dispersing agent and strengthening agent, strength of formed coke was investigated, alone with other two parameters forming pressure and moisture content, which was to determine the best condition of cold-forming. Took the economic benefit into account, the feasibility of this binder in coke powder cold-forming was analyzed.In this study, coke powder was raw material and industrial molasses serves as binder; through the dosing dispersing agent and strengthening agent, strength of formed coke was investigated, alone with other two parameters forming pressure and moisture content, which was to determine the best condition of cold-forming. Took the economic benefit into account, the feasibility of this binder in coke powder cold-forming was analyzed.Based on the study, dosing dispersing agent with organic matter as main content could enhance the fluidity of industrial molasses and reduce its dosage; while the dispersing agent with inorganic matter as main content could contribute to the strength of pellet when temperature is in upper-middle range. Pelletizing rate and pellet strength were improved by dosing dispersing agent and strengthening agent when industrial molasses was used as binder. Under a fixed condition that industrial molasses dosage is10%, moisture content is12%and forming pressure is35MPa, without dispersing agent, wet pellet drop strength is1.0·(1m)-1, dry pellet drop strength is2.0·(2m)-1and pellet strength at300℃was0. With dispersing agent, wet pellet is1g·(100g coke powder)-1, wet pellet drop strength increased to3.0·(1m)-1,dry pellet reached as high as>10·(2m)-1and pellet strength was4.6·(2m)-1at300℃,3.8·(2m)-1at500℃and3.4·(2m)-1at950℃.Thus the ratio of industrial molasses: dispersing agent:strengthening agent is10:1:1.Under the same conditions, comparing this binder with other common inorganic and organic binders shown that the optimum effect was realized by industrial molasses Furthermore, the impact that forming pressure and forming moisture on cold-forming of coke powder implies the suitable forming pressure and moisture content is35MPa and12%, respectively.With the thermogravimetric analysis, it was learned that there are approximately5%of residual impurity in the binder after the combustion under1100℃, which meant that the ash content of the formed coke was basically stable with the use of cold-forming binder that mainly constituent of industrial molasses. It was revealed from the FT-IR results that the aromatic ring consistency of binder with the addition of dispersant and reinforcer was higher than that of industrial molasses, thus realizing the aromatic ring polymerization and thereby decreasing the aromaticity of consistency molecular.The formed coke with compressive strength910N was achieved with the use of the binder which the proportion of industrial molasses:dispersing agent:strengthening agent was10:1:1under the condition of moisture content12%and forming pressure35MPa. The pellet drop indexes in300℃、500℃and950℃were98.23%,97.22%and89.67%,respectively. The pellet was intact in200-950℃and the drop index was91.84%.In reality, the pelletizing technology and equipment should be determined from actual conditions in the practical production. The coke powder cold-forming to replace coke was cost-effective. The annual income increase was7,720,650.The forming processing of formed coke was simple and could be realized in ambient temperature. With high quality of product, low drying temperature, short in time, low energy consumption and cheap raw materials, endorsing it with wide application prospects.