Research On Industrial Waste In Cement

Cement production process, by adding admixed materials, not only may use the industrial waste residue massively, reduce environmental pollution, moreover can save the clinker, raise the cement output, and reduce the cement cost, while improve the cement certain properties, such as lowering the hydration heat, enhancing the durability and corrosion resistance, inhibiting alkali-aggregate reactions and so on. Therefore it is very important to devoting in the research on industrial waste residue in the cement production process, both good economic and social benefits.This paper mainly studies the preparation of cement admixed materials using industrial waste - zirconium silicon residue, metal magnesium slag, micro-silica powder, and proposes a new utilization method of zirconium silion residue. With the aid of XRD, DTA, TG, FT-IR and SEM, it is studied systematically that the influence of the different technological conditions and the parameter-allocated proportion to prepare the cement mixed materials, and the properties of spcimens have been tested.The studies of the acidic zirconium silicon residue have shown that it contains a lot of silica and chloride ions, which silica is aggregate composed of amorphous silicon dioxide sub-micron colloidal particles not easy to be dispersed, with low activity. In acidic or alkaline environment, zirconium silicon residue is easy to become the gelatin, easily absorbs a large number of water molecules and chlorine ions. The high-temperature calcination can effectively remove chlorine ions and water in the acidic zirconium silicon residue, improve the proportion of silica to provide feasibility for further modification of zirconium silicon residue; at the same time, high-temperature calcination can also break aggregate in zirconium silicon residue, beneficial to the follow-up hydration reaction in the cement.Modified zirconium silicon residue, containing a high proportion of silica, can react with calcium oxide in the cement clinker to procuce a higher intensity of mineral C3S and C2S, thereby increasing the strength of cement and becoming a new type of mixed material in cement industry. It is used that different calcination systems and NaOH solution with different PH values activate silica in the zirconium silicon residue. Through the experiments, the optimum calcination parameters of material modification are found. Using NaOH solution with different PH values to activate the zirconium silion residue, the desired results is not achieved.The paper further studies the comprehensive utilization of modified zirconium silicon residue, magnesium slag, and silicon powder, to prepare composite cement including the single, the double and the three kinds of cement mixed materials. By comparing various performances of spcimens, their optimal processing parameters have been determined, and the three mixed composite cement is the best. Simultaneously it makes the zirconium silion residue and magnesium slag, micro-silica powder use synthetically in the cement become ture. Moreover In a certain extent, it improves the strength of cement, overcomes low water resistance and unstable strength etc., and reduces cost. Such can provide technical support for the use and promotion of the new building materials.In this paper, zirconium silicon slag, magnesium slag, micro-silica powder cement mixed materials have advantages of energy-saving, environmental protection, technology simple and low cost and so on, and strength properties of spcimens meet the application requirements.