High temperature interactions between coal ash and MgO-based refractories in lime kiln conditions
نویسندگان
چکیده
Magnesium oxide (MgO)-based refractories are commonly used in quicklime and cement rotary kilns. At the high temperatures kiln burn zone, infiltration of molten fuel ash into refractory can occur. Subsequent chemical interactions cause wear that inflicts maintenance costs loss production. To improve reliability, it is necessary to increase understanding between slag liner materials. Three commercially available MgO-based materials were exposed coal at 1200 °C 1400 for 15 60 min under a CO2-rich gaseous environment. Hot from infiltrated depths estimated with scanning electron microscope energy dispersive X-ray spectroscopy. Based on detailed elemental microstructure analyses, examined. Molten silicates through grain boundaries pores up 2.8 mm. Powder diffraction samples indicated MgO grains reacted SiO2-containing phases form Mg2SiO4. This was identified as corrosion product whose formation supported by thermochemical equilibrium calculations. Elevated Mg content found residue top samples, indicating dissolution or dislocation components. In addition, such residue.
منابع مشابه
RECYCLING PRACTICES OF SPENT MgO-C REFRACTORIES
The recycling options of spent MgO-C refractories from an electrical arc furnace (EAF) have been evaluated. The economic, quality of spent refractories and products made from it, the ease of implementation of a recycling practice and the interest of steel melt shops were considered. It was decided that the best option of most EAF shops would be to recycle spent MgO-C refractory as a foaming sla...
متن کاملLime Kiln Chemistry and Effects on Kiln Operations
A lime kiln is used to convert lime mud into lime for reuse in the causticizing plant of the kraft recovery process. Many of the problems encountered in lime kiln operations can be related to kiln chemistry, including TRS and SO2 emissions, dusting, ringing and refractory brick thinning. Understanding the composition and thermal behaviour of lime mud and the major chemical reactions involved is...
متن کاملCalcium sulphosilicate in lime-kiln wall coating
Green calcium sulphosilicate layers were formed in lime-larnite-calcite wall coating in a lime kiln at Rivervale, Western Australia. The compound formed in the kiln flame area by the combination of siliceous lime sand feed with sulphur trioxide from the sulphurous oil fuel. The calcium sulphosilicate is orthorhombic with a IOq83, b I5"4o8, c 6'825 A, space group Pcrnn. Crystals are [IoOl tablet...
متن کاملThe Effect of Kiln Temperature on DRE and Organics Concentrations in Incinerator Ash
3333679 37 6 $ E The Effect of Kiln Temperature on DRE and Organics Concentrations in Incinerator Ash W. R. Schofield, PhD, PE; W. V. Walls, PE; and Thomas Jones Chemical Waste Management, Inc. (CWM) conducted RCRA and TSCA trial burns on the world-scale hazardous incinerator a t Port Arthur, Texas, in early 1990. Subsequent commercial operation revealed start-up problems which included (1) com...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: Fuel
سال: 2023
ISSN: ['0016-2361', '1873-7153']
DOI: https://doi.org/10.1016/j.fuel.2023.127711