Preparation Of Alumina Sol And The Application In Corundum Based Castables

In the development of amorphous refractory, bonding agent is a key factor. The combination of amorphous refractory never seen in its development trend for the combination of water and hydration, chemical combination, water hydration combination and coacervation combination, coacervation combination, the combination may bring impurities from the combination of high to low impurity, and with no impurities in the direction of development, thereby greatly improving the purity of the refractories. Such materials cann't generate new low melting phase, to improve the performance of high-temperature, and can be used in higher temperature. At present, Most of using alumina Sol as bonding agent of the coacervation combination in this field, because of alumina Sol stability in acid conditions, but strong acid conditions have a greater impact on component of inorganic aggregate; Addition, because of the mass number of alumina sol very low, and seriously of the glomeration phenomenon, its seriously impediment alumina sol to application.This paper is mainly made up of two parts, first part , the major adopted a new approach to synthesis alumina Sol and composite system, expecting to be gained morphology can be controlled, and simple preparation of the Sol system, to explore new synthetic technology and conditions. The second part is in the preparation of the alumina sol add water-soluble polymer or polymer emulsion to made of aluminum - organic polymer compound bonding agent, it as a combination of corundum castable, expecting through such compound bonding agent to effectively improve the early strength of the sample. The detailed research work was carried out as follows:Firstly, adopted a biomimetic approach and organic polymer PEI as a template, isopropanol aluminum as raw materials, in accordance with the principle of Sol-Gel to prepared of a series of different mass number of alumina sol, its microstructure was analysised and characterized, at the same time, alumina Sol system was formed the drying Gel by dry, with different temperatures to gain the final product of the microstructure was characterized.Secondly, adopted a biomimetic approach and organic polymer PEI as a template, aluminum lactate and magnesium lactate as raw materials, in accordance with the principle of Sol-Gel to prepared of a series of different aluminum-magnesium compound Sol(AMH), studied room temperature on the preparation of aluminum-magnesium compound Sol's basic performance, results showed that: Under the room temperature at 15℃conditions of the AMH is similar to the template and structure of aggregation, this special PEI formation and morphology of the catalytic function.Thirdly, to High Purity of boehmite and organic polymer as raw materials, prepared of aluminum sol - polymer compound bonding agent under certain conditions, the compound bonding agent in the application results showed that the best combination effectiveness of aluminum sol - emulsion compound bonding agent. when the amount of crosslinking agent for the monomer emulsion 5%, crosslinking temperature is 90℃, their strength after drying the sample can be up to 4 MPa, and the different heat treating temperature of the sample after Conventional performance was tested by SEM, and discussed simply of the mechanism of the combination.Fourthly, three different binder such as aluminum sol - polymer emulsion compound bonding agent, aluminum sol– polyacrylamide bonding agent, cement bonding agent were used corundum castable , the combined strength of corundum castable were compared on three different the combination of conventional performance and SEM picture, and discussed simply the three different mechanism of the binder.