Synthesis on research results of FGD gypsum briquetting

Abstract

Abstract. FGD gypsum products can be characterized by significant solubility in water and dusting in dry state. These characteristics can cause a considerable pollution of air, water and soil. Among many approaches of preparing utilization of this waste, the process of compaction using briquetting has proved to be very effective. Using FGD gypsum products a new material of fertilizers characteristics has been acquired and this material is resistant to the conditions of transportation. This paper presents results of experimental briquetting of flue gas desulphurisation products in a roll press. The experiments were conducted in a laboratory roll presses LPW 450 and LPW 1100 equipped with two interchangeable forming rings that form material into saddle-shaped briquettes with volume 6,5 cm 3 and 85 cm 3 . The experiments were conducted with various percentage amounts of FGD gypsum moisture. The results provided information regarding influence of moisture and roll press configuration on quality of briquettes. On the basis of obtained results, technological process and a general outline of technological line for FGD gypsum were developed. Two roll presses of own construction with different outputs were identified as appropriate for this purpose. A range of necessary works related to their adaptation for the FGD gypsum briquetting were pointed out.

The preparation of composite solid fuels in the roll press

“…The fuels prepared in a mixer were then placed in a roll press equipped with a gravity feeder and forming rings allowing for obtaining a saddle-shaped briquettes of 6.5 cm 3 volume. Studies conducted in the Department of Manufacturing Systems confirmed the efficiency of using this type of asymmetrical layout compacting system for briquetting waste materials [7,8,9,10]. The amount of fine-grained solid fuels was 5 -7 kg.…”

Environmental and geotechnical suitability of recycling waste materials from plasterboard manufacturing

“…Huge amounts of gypsum are being produced through flue-gas desulfurization (FGD) processes, which remove sulfur dioxide (SO 2 ) from exhaust flue gases (as a requirement from regulatory authorities to reduce release of SO 2 into the atmosphere) from coal-fired power plants. Kosturkiewicz et al (2017) have provided a detailed account of gypsum-based products through the FGD process. It is to be noted that, as the world is moving towards sustainable solutions and replacing unsustainable energy sources (including coal-fired power generation) with sustainable sources, future generation of such gypsum through FGD is likely to be reduced.…”