Synthesis on research results of FGD gypsum briquetting Bogdan Kosturkiewicz, Andrzej Janewicz, Marek Hryniewicz and Łukasz Kosturkiewicz E3S Web Conf., 14 (2017) 02031 Published online: 15 March 2017 DOI: 10.1051/e3sconf/20171402031