Test methods for heavy clay ceramic raw materials: ceram-technological behaviour (secondary properties) – part 2

Prior to designing any dryer and kiln layout, Lingl ­always conducts comprehensive raw material tests. This is the basis for high-quality products made by Lingl’s customers. This two-part article presents those laboratory tests at least necessary from the point of view of the plant supplier as well as supplementary tests. Part 1 of the article (Zi 4/2013) deals with material analyses of the raw materials (primary properties). Part 2 presents tests on the ceram-technological behaviour, i.e. the drying and firing behaviour (secondary properties) as well as possible tests on pilot-plant scale.

3 Ceram-technological behaviour (secondary properties)

The primary properties of a clay or a batch result in a definite ceram-technological behaviour, which can be simulated under laboratory conditions or partly on pilot scale. The ceram-technological tests serve as a basis for the design and the optimization of dryers and kilns, the development and optimization of batches or the detection of firing faults.

3.1 Preparation and shaping

According to [38] the main demands in ensuring the plastic mouldability of heavy clay materials refer to
› the processing properties (mouldability without...

Related articles:

Issue 11/2013

Grinding behaviour of clay bricks – results from the laboratory and field

For mortar- and joint-free building with bricks, the cut surfaces of the bricks must meet high requirements. To compensate for unevenness on the cut surfaces, the bricks are ground. Lingl has...

Issue 04/2013

Test methods for heavy clay ceramic raw materials: raw material composition (primary properties) – part 1

1 Introduction Clay is the basis of any silicate ceramic product. According to [6], the official definition of the Nomenclature Committee of the Association Internationale pour l’Etude des Argiles...

Issue 04/2021

Quality improvement of ceramic products by raw material and mass testing

There are many reasons why an operating mass in a brick factory needs to be adjusted. At some point, even the largest clay deposit is exhausted or the properties of the clay in the pit have changed to...

Issue 06/2014

Grinding behaviour of bricks – results from laboratory and practice (Part 2)

3 Objective To reduce the number of grinding tests as well as to enable the targeted pre-selection of tool and machine characteristics, a measuring method was to be developed to provide quantitative...

Issue 06/2014

Differences in the production-related properties of the three primary clay minerals kaolinite-illite-montmorillonite (Part 2)

4 Shaping properties To this day, there is no uniform laboratory process for measuring plasticity as this is used as a collective term for many complex properties such as viscosity, yield or...