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Trojosky M.,Allgaier Process Technology GmbH | Roller R.,Allgaier Process Technology GmbH | Frey M.,Allgaier Process Technology GmbH
Cement International | Year: 2015

Sand is one of the most widely used construction materials in the world. Among other products, it is used for the manufacture of mortar, tile cement, plaster and floor finishes, which are marketed as so-called "ready mix" products. In addition, sand is required for the manufacture of glass; particularly high-quality sand latterly in the form of so-called "frac sand" is used during natural gas extraction and in many other sectors of industry. It is necessary to dry the sand, e.g. so that it can be screened subsequently into different fractions with high selectivity. Cooling is necessary if required by the downstream process steps or due to the subsequent addition of temperature-sensitive additives, as well as for storage and packaging reasons. One technical solution for sand drying is the drum dryer system Mozer® from Allgaier Process Technology GmbH. In this system double-shell units are used. The drying takes place in the inner drum tube, while the cooling is undertaken in the outer tube on the same unit. Along with the proven, extremely robust and economical drying-cooling drum system TK in which the material to be dried is cooled by ambient air, Allgaier supplies the system TK+, which makes a very significant contribution to saving fuel and electrical energy by means of so-called evaporative .cooling. The operation principal and the advantages of the mentioned system are described in the article.

Trojosky M.,Allgaier Process Technology GmbH | Autenrieth B.,Allgaier Process Technology GmbH | Stolzner C.,Allgaier Process Technology GmbH
Aufbereitungs-Technik/Mineral Processing | Year: 2013

Allgaier's delivery program includes a special rotary dryer, which makes the use of rock washing plants unnecessary. The patented drying and cleaning drum system MOZER® TRH combines the process steps of drying and cleaning in one unit. After a quick pre-drying of the rock in the first part of the dryer, the loam and clay components adhering to the limestone are separated by means of a carefully controlled combination of retention time and mechanical stress in the second part of the dryer with an extended diameter drum. Fine components of the separated pollutants are discharged to the filter plant already with the waste air of the dryer, while the remaining pollutants, which, however, are separated from the rock, can be separated from the cleaned limestone rock by means of screening plants. The Allgaier drying and cleaning drum is distinguished by very good cleaning results, a particularly efficient operating mode as well as moderate and relatively low investment and operating costs.

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