Extraction of potassium chloride using fly ash from cement bypass dust

Abstract

Cement bypass dust from a chlorine bypass system to cut off the contents of chlorine in the cement mainly has potassiumchloride, lime, and small amount of heavy metals such as lead. Due to the high value of KCl which is usually used at thefertilizer in the cement bypass dust, it has been widely studied and set the process for obtaining potassium chloride. The firststep of acquiring the product is to combine both cement bypass dust and distilled water. Then, it is stirred and filtered forgetting the 1st slurry. This one is mixed with the sulfuric chelating agent and then exposed under the atmosphere of CO2. Afterthe retention under the condition of CO2, it is re-filtered and dried for making the product to use like the fertilizer. However,during the acquisition of KCl from the referred process, it must be occurred the problem of cost to use the sulfuric chelatingagent for eliminating the heavy metals. In this study, we used the fly ash one of the industrial waste instead of the chelatingagent not only for removing heavy metallic ions but also increasing the quality of KCl value in the product.