caa a22 4500 606170286 CHVBK 20210128100716.0 cr unu---uuuuu 210128e20151201xx s 000 0 eng 10.1007/s10098-015-0973-2 doi (NATIONALLICENCE)springer-10.1007/s10098-015-0973-2 A cleaner production of sodium hydrogen carbonate: partial replacement of lime by steel slag milk in the ammonia recovery step of the Solvay process [Elektronische Daten] [P. de Carvalho Pinto, M. de Oliveira Carvalho, F. Linhares, T. da Silva, G. de Lima] Most soda ash originates from the Solvay process that involves the aqueous reaction of NaCl, CO2, and NH3 rendering, after five steps, sodium carbonate as well as solid and liquid wastes. In the final stage, the NH4Cl originated in the first step reacts with Ca(OH)2 (lime milk), recovering most of the NH3, recycled in the process. In this work, we propose the use of steel slag, a low cost and abundant waste material of siderurgy, as source of CaO in the Solvay process. In our approach, the lime milk is partially replaced by steel slag in the NH3 recycling, recovering up to 40 wt% of the total ammonia. It can decrease the amount of CaCO3 and fossil fuels required and consequently decrease the amount of wastes originated in the procedure. In addition, we found that a simple thermal treatment of the mother liquor, immediately before the reaction with Ca(OH)2, could recover about 17-26 wt% of the NH3, reducing reagent demands and consequently effluent amounts. Another advantage is the lesser Ca(II) detected in the waste waters and the fewer caustic sludge produced in this new process. Despite it is a preliminary work, at the laboratory scale, our procedure suggests a synergic connection of the steel and soda ash productions that might reduce energy and costs, as well as the carbon dioxide emissions related to both the Na2CO3 and steel industries. Graphical Abstract: Springer-Verlag Berlin Heidelberg, 2015 Ammonia reclaims nationallicence Mother liquor nationallicence Solvay process nationallicence Steel slag nationallicence de Carvalho Pinto P. Departamento de Química, Universidade Federal de Minas Gerais, CP 702, 31270-901, Belo Horizonte, MG, Brazil aut de Oliveira Carvalho M. LUT Energy, Lappeenranta University of Technology, 53581, Lappeenranta 20, Finland aut Linhares F. Departamento de Química, Universidade Federal de Minas Gerais, CP 702, 31270-901, Belo Horizonte, MG, Brazil aut da Silva T. Departamento de Química, Universidade Federal de Minas Gerais, CP 702, 31270-901, Belo Horizonte, MG, Brazil aut de Lima G. Departamento de Química, Universidade Federal de Minas Gerais, CP 702, 31270-901, Belo Horizonte, MG, Brazil aut Clean Technologies and Environmental Policy Springer Berlin Heidelberg 17/8(2015-12-01), 2311-2321 1618-954X 17:8<2311 2015 17 10098 https://doi.org/10.1007/s10098-015-0973-2 text/html Onlinezugriff via DOI BK010053 XK010053 XK010000 Metadata rights reserved Springer special CC-BY-NC licence nationallicence 1 research-article jats NATIONALLICENCE NATIONALLICENCE NL-springer NATIONALLICENCE 856 40 https://doi.org/10.1007/s10098-015-0973-2 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- de Carvalho Pinto P. Departamento de Química, Universidade Federal de Minas Gerais, CP 702, 31270-901, Belo Horizonte, MG, Brazil aut NATIONALLICENCE 700 1- de Oliveira Carvalho M. LUT Energy, Lappeenranta University of Technology, 53581, Lappeenranta 20, Finland aut NATIONALLICENCE 700 1- Linhares F. Departamento de Química, Universidade Federal de Minas Gerais, CP 702, 31270-901, Belo Horizonte, MG, Brazil aut NATIONALLICENCE 700 1- da Silva T. Departamento de Química, Universidade Federal de Minas Gerais, CP 702, 31270-901, Belo Horizonte, MG, Brazil aut NATIONALLICENCE 700 1- de Lima G. Departamento de Química, Universidade Federal de Minas Gerais, CP 702, 31270-901, Belo Horizonte, MG, Brazil aut NATIONALLICENCE 773 0- Clean Technologies and Environmental Policy Springer Berlin Heidelberg 17/8(2015-12-01), 2311-2321 1618-954X 17:8<2311 2015 17 10098