EFFECTS OF CARBONATION ON THE MINERAL COMPOSITION OF CEMENT KILN DUST By Cecilia P. Anderson Department of Geological & Mining Engineering & Sciences

60 1 Der Prozess im Holcim Werk Lägerdorf. Aufgabenstellung: Calcinatortemperaturregelung. In der Zementproduktion sind viele verschiedene Anlage­ konzepte bekannt. Fast alle neueren und energieeffizienten Anlagen haben heute einen Schwebegas­Vorwärmer mit meh­ reren Zyklonstufen und einen Calcinator in dem die Entsäue­ rung (CaCO3 → CaO + CO2) des Rohmehls stattfindet. Die Entsäuerung des Rohm...

Prevention and mitigation of acid rock drainage from mining are decisive for limiting environmental impact. Five by-products and industrial remnants (lime kiln dust, blast furnace slag, granulated blast furnace slag, cement kiln dust and fly ash) were investigated for their suitability to prevent acidity and metal(loid)s during leaching from highly sulfidic (50wt%, sulfide) waste rock in small ...

This article presents the numerical modeling of thermochemical conversion biomass and tires as alternative fuels in kilns dedicated to production cement. The study seeks understand control phenomena that occur when heavy fuel oil (traditional fuel) is partially replaced by tires. These are thoroughly mixed with meal at entrance rotary kiln form bed solids. mathematical model developed takes int...

The design of a regulatory control strategy for a pilot rotary kiln to produce activated carbon is presented. A complex dynamic behavior with high non-linearity and an important dead time characterizes the rotary kiln operation. The main control objective of the process is to maintain the solid temperature profile inside of a narrow limit in order to produce an activated carbon with acceptable ...

−− This work presents a mathematical modeling and steady state simulation study of the pilot scale rotary kiln behavior, which was designed to activate charcoal obtained from the raw materials of region of Cuyo-Argentina. The proposed model aims for acquiring useful information to select operating conditions and design parameters. It is a simplified mathematical model that consists of a system ...

Leaching of metals from cement under various environmental conditions was measured to evaluate their environmental safety. A cement product containing clinker, which was produced from cement kiln co-processing of hazardous wastes, was solidified and leaching of metals was characterized using the 8-period test. Concentrations and speciation of metals in cements were determined. Effects of ambien...