Model of technological alternatives of production of sodium chromate (VI) with the use of chromic wastes

• Published in: Waste management (Elmsford) Vol. 20; no. 8; pp. 711 - 723
• Main Authors: Walawska, Barbara, Kowalski, Zygmunt
• Format: Journal Article Conference Proceeding
• Language: English
• Published: Oxford Elsevier Ltd 01.12.2000; New York, NY Elsevier Science
• Subjects: Applied sciences; Chemical industry and chemicals; Chromic waste; Chromium compounds; Environment; Exact sciences and technology; Industrial chemicals; Inorganic industry; Modeling; Optimization; Other industrial wastes. Sewage sludge; Pollution; Wastes; Poland; Europe; Chromium compounds; Environment; Modeling; Chromic waste; Optimization; Chromium Compounds; Hazardous waste; Raw materials; Sodium Chromates; Heavy metal; Industrial waste; Manufacturing process; Upgrading; Waste reuse; Solid waste; Mathematical model
• ISSN: 0956-053X; 1879-2456
• DOI: 10.1016/S0956-053X(00)00038-6

This article presents a mathematical model which describes the sodium chromate (VI) production process with the use of chromic waste as a substitution of natural raw materials. This model is a function of selected process parameters common for all of the examined alternatives and based on equations of material balance. Optimization of the elaborated technological alternatives of the production process with use of recycling of chromic waste has been evaluated by determining the extreme value of the quality indicator WJ. This indicator defines the quantity of waste created in the process. Optimization results enabled the selection of the optimal technological solution from all of the alternatives possible for use in industrial practice. Negative values of the indicator prove that there is the possibility of introducing to the process a larger quantity of waste than the one obtained in the process and transported to the storage heaps.