Improved miroporous ceramic filtering plate and preparation

Abstract

The invention relates the improvement of micropore ceramic screen plate, which is resistant to fluorine and the medium the pH of which is above 8.5-12. The characteristic is that particles of aggregates are made by titanium dioxide particle and base binder is made up by 5-10 parts titanium dioxide powder. The porosity of screen plate is 30-50% and the gas pore bore diameter is 0.9-3mu. Using the titanium dioxide as main material, the invention possesses good processing property, high mechanical strength, good machining property and proper price.

Description

technical field [0001] The invention relates to the improvement of the microporous ceramic filter plate, in particular to a microporous ceramic filter plate for micro-fluorine resistance and PH>8.5-12 medium. Background technique [0002] The ceramic filter with microporous ceramic filter plate as the filter element has the advantages of high efficiency, energy saving, water saving and environmental protection, so it is widely used in the fields of mine pulp dehydration process, chemical production dehydration filtration and other fields. At present, the microporous ceramic filter plates at home and abroad all use clay and / or kaolin as the binder of the skeleton particles. After firing, the ceramic filter plates are endowed with mechanical strength. They have become an indispensable and important component of the microporous ceramic filter plates. Sub raw materials. For example, in the filter plate disclosed in US Pat. No. 4,981,589, 23-30% clay is used in the first laye...

AI Technical Summary

Problems solved by technology

However, SiO2, one of the main chemical components in clay and kaolin, is not resistant to corrosion by microfluorine (such as 10-20mg / L), and has poor corrosion resistance to alkaline media with a pH>8.5-12

For example, when the fluorine content is ≥ 10mg / L or the pH is > 8.5-12, and the temperature is > 30°C, the ceramic filter plate will first appear loose, and then it will be mushy, so that the mechanical strength of the filter plate will not last for several months, weeks, or even several years. A sharp drop occurs within a day, which will cause catastrophic damage to the filter plate under the action of operating mechanical force

On the ceramic filter, there are usually dozens or even hundreds of microporous ceramic filter plates. Once one is damaged, it will affect the others, causing the equipment to not work normally, and the consequences are quite serious.

Therefore, at present, ceramic filters cannot be used as solid-liquid separation equipment for any filter medium containing fluoride ions and pH>8.5-12, so its superiority cannot be fully utilized in this application environment.