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http://dx.doi.org/10.7844/kirr.2017.26.6.38

Study of Using Carbon Dioxide for Obtaining Potassium Chloride from Cement By-Pass Dust  

Kim, Kyoungseok (Eco Composite Materials Team, Energy & Environmental Division, KICET)
Chu, Yongsik (Eco Composite Materials Team, Energy & Environmental Division, KICET)
Publication Information
Resources Recycling / v.26, no.6, 2017 , pp. 38-44 More about this Journal
Abstract
As by-pass dust (BPD) made from cement manufactured process is designated waste, it is required to bury as high cost. The main component of BPD is potassium chloride (KCl), and used for the fertilizer. For using KCl to the fertilizer, the pH value of KCl is required as neutral or weak acid. However, it is not suitable to apply BPD into the fertilizer directly without any other treatment because BPD's pH value is shown 12.0~12.5; a high base. In this study, the carbon dioxide ($CO_2$) was used for removing calcium oxide (CaO) and reducing pH value during manufacturing process of KCl. We fixed inner condition of the carbon test chamber as $25^{\circ}C$-50RH%, and retained 0~7 hours under the 20 vol% of $CO_2$ atmosphere. After experiment, we analyzed the content of CaO and pH value from each samples. The more time exposed to $CO_2$, the content of CaO and pH value are shown. Furthermore, pH value exposed in 6 hours nearly reached 7.
Keywords
Cement by-pass dust; Carbon dioxide ($CO_2$); pH; Calcium oxide (CaO); Potassium chloride (KCl); fertilizer;
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Times Cited By KSCI : 1  (Citation Analysis)
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