Laboratory slag tests

To determine the mechanisms of alkali attack and resulting reaction products, laboratory-prepared powders of alkali and alumino-silicate refractories have been fired at various temperatures. Results obtained from these reaction tests have supported the findings from the field samples. Alkali slag tests are performed by the various manufacturers to determine how their products withstand corrosion by alkalies. 

For demonstration we use the data of a cooperative test [DOERFFEL and ZWANZIGER, 1987], In this interlaboratory comparison five laboratories were involved in the analysis of slag samples three times for seven chemical elements. So the (15, 7)-data matrix consists of 5 times 3 rows and 7 columns. The raw data in % are given in Tab. 5-2. The data have been preprocessed by standardization (autoscaling). 

R. W. Borio, G. J. Goetz, and A. A. Levasseur, "Slagging and Fouling Properties of Coal Ash Deposits as Determined in a Laboratory Test Facility," paper presented at the ASME Winter Annual Meeting, December 1977, Combustion Engineering publication TIS-5155. 

Fallman AM, Harden J (2001) Leaching slags, ashes controlling factors in field experiments versus in laboratory tests. In Waste materials in construction. Elsevier, Amsterdam, pp 234-237... 

The need to add Waelz slag to the charge is dictated by two circumstances. First, Waelz slag is a good reductant since it contains free unreacted carbon second, iron contained in the Waelz slag is also a good reductant and serves to remove lead from the matte. Thus, a fundamental possibility to smelt a lead-copper-zinc feed achieving satisfactory process values was found in the course of the laboratory tests. 

Fallman, A.-M. 1997. Leaching of chromium from steel slag in laboratory and field tests - a solubility controlled process WASCON 97, The International Conference for the environmental and technical implications of construction with alternative materials, Houthem, The Netherlands. 

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