Method for preparing rubber filler by modifying coal ash waste slag obtained after extracting aluminum through acid process
A technology of fly ash waste slag and rubber filler, which is applied in the direction of fibrous filler, dyeing physical treatment, dyeing low-molecular organic compound treatment, etc. It can solve the problems of complicated process and the utilization of unburned carbon in ash slag, etc. Achieve the effects of simple process, resource saving and emission reduction
Active Publication Date: 2012-11-14
CHINA SHENHUA ENERGY CO LTD +1
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The invention relates to a method for preparing a rubber filler by modifying coal ash waste slag obtained after extracting aluminum through an acid process. The method comprises the following steps: leaching the coal ash waste slag obtained after extracting aluminum through the acid process to be neutral, and then drying; and crushing to 300 meshes, adding an organic modifying agent, mixing at a high speed, grinding and ageing to obtain the rubber filler. The coal ash is made into white carbon black to be used for rubber filler in the prior art. However, according to the invention, amorphous SiO2 in the coal ash waste slag is effectively utilized; and what's more important, unburned carbon contained in the coal ash waste slag is fully utilized and can be partially used for replacing carbon black in the rubber filler, thereby saving energy resources, and reducing emission of carbon dioxide. The unburned carbon is uniformly compounded with amorphous silicon dioxide and is subjected to surface modification, so that the unburned carbon is uniformly dispersed in a rubber matrix and is good in compatibility, stable in performance, simple in process and low in cost. Mechanical properties of a sample are tested, and all the indexes reach the GB3778-94 standard.
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