The corrosion of refractory by glass melt results in many problems, which increases the production downtimes. Porous components like plunger and tube were infiltrated with glass melt after the change and create a lot of bubbles. Due to the corrosion this components have to be changed after a few months. A new technology for such components was developed at the TU Bergakademie Freiberg, Germany, which lowers the interaction between glass melt and refractory significant. The coating method of the ancorro technology for porous refractory bricks influences the glass properties in the contact area. Due to the coating an oxygen depression is generate in the pores of the bricks. These oxygen depression results in a rising of the viscosity and surface tension of the glass melt in the contact area, which slows down the attack of the refractory by glass melt. Different measurements demonstrate the influence of a reducing atmosphere to the glass properties. By realizing a lot of laboratory tests (e.g. finger tests, blistering) the interaction between glass melt and refractory can be decreased up to 90%. Also the corrosion level of fused cast bricks is realizable with porous bricks after using the coating technology. Mathematical calculations show the influence of the ancorro coating technology to the typically corrosion processes which lowers the refractory attack by glass melt. Also the nucleation, which is a problem at the orifice ring on a container glass furnace, can be prevented. During the laboratory tests only homogeneous nucleation were detected by using the coating technology on the refractory before glass contact. A lot of industrial tests on different components show the same tendency as found in the laboratory. So the ancorro coating technology was successfully implemented in industrial scale. Economical calculations demonstrate that the lower interaction between refractory and glass melt results in a bisection of the costs for production downtimes due to the changing process. In addition, prevention of the nucleation at the orifice ring allows a modification of the glass batch to a higher CaO-content. This batch modification decreases energy consumption and CO_2 emission and save costs for soda ash. The saving for a container glass producer can be up to 500,000 EUR per year and furnace.
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