CBPD Recycling Strategies Driven by Alternative Fuels in the Cement Industry

This study aims to analyze the trends and types of CBPD recycling technology based on domestic and internationally published papers and patent applications, and to suggest future directions for technology development. To this end, we collected and constructed CBPD-related papers and patent data, and quantitatively analyzed technology trends by year, country, and research field. Through this, we identified the flow of CBPD resource technology and major research trends.

The analysis results showed that recently, there has been an increase in papers and patent applications on technologies for recycling CBPD in its original form in other industries or chemically recovering useful resources such as potassium chloride (KCl). Initially, research and development was focused on circular recycling centered on resource circulation and improvement of chlorine bypass facilities, but recently, carbon reduction-type recycling technology development has been actively conducted to respond to strengthened environmental regulations. This can be interpreted as an attempt to utilize calcium and silica, which are major components of CBPD, as raw materials for cement manufacturing. In addition, advanced technologies that simultaneously absorb greenhouse gases and produce KCl are being proposed to achieve the carbon neutrality goal. CBPD is washed and the sludge is used to absorb carbon dioxide through carbonation reaction, and KCl is extracted and purified from the residue. In addition to replacing raw materials and fuels, it can be applied as an additional means for reducing carbon in the cement industry where direct greenhouse gas reduction is difficult.

The recycling of CBPD is evaluated as an important opportunity to create industrial added value while improving environmental sustainability. If a practical R&D strategy is established and promoted based on the results of the technology trend analysis presented in this study, it is expected to contribute to the establishment of a circular economy system in the cement industry.