Porous ceramics Screen plate resisting low concentration hydrofluoric acid and preparation method thereof

Abstract

The invention discloses a porous ceramic filtering plate with low-concentration hydrofluoric acid resistant, relating to a porous ceramic filtering plate used for solid-liquid separation of ore pulp of mineral oil industry. The invention consists of a base plate and the ceramic filtering film coated on the base plate; the base plate is compatible with organic binder; the ceramic filtering film isformed by the compatibility of capacitance corundum, alumina powder, mineralizer of non-silicon ceramic material, non-silicon pore-forming agent with organic binder, so as to produce the filtering plate which has not only ideal porosity rate (30-50 percent), suitable micropore size (2Mum or so) and good pressure (30-50MPa), but also has the performance of resistance of low-concentration hydrofluoric acid (with the concentration less than 0.2g / l) and working medium with pH value of 8-14; the invention can be washed by hydrofluoric acid and alkali and dehydrated and filter by ore pump containinga small quantity of hydrofluoric acid (less than 0.2g / l).

Description

technical field [0001] The invention relates to a porous ceramic filter plate used for solid-liquid separation of ore pulp in the mining industry, in particular to a ceramic filter plate that can be used for dehydration and filtration of ore pulp containing a small amount of hydrofluoric acid (<0.2g / l). It can also be cleaned with hydrofluoric acid, and at the same time it provides a manufacturing method of the low-concentration hydrofluoric acid-resistant porous ceramic filter plate. Background technique [0002] As a filter medium, the micropores of the ceramic filter plate of the ceramic filter will be blocked during use. In order to prevent the filter capacity from weakening, periodic chemical cleaning and ultrasonic cleaning are required. There are many kinds of substances that cause the clogging of ceramic filter plates, and the right medicine should be prescribed for chemical cleaning. The most common blockage in actual production is silica colloid, which cannot b...

AI Technical Summary

Problems solved by technology

[0003] Yet, all adopt clay and quartz etc. as binder (as Chinese patent CN01114048.8) in the formula of existing ceramic filter plate, its main component is SiO 2 Therefore, if hydrofluoric acid is used in chemical cleaning, it will corrode the ceramic filter plate, make it loose and lose its strength, causing the overall damage of the filter plate and accidents

At the same time, the adaptability of the ceramic filter plate to different materials, especially the adaptability to a small amount of hydrofluoric acid (<0.2g / l) in the pulp, affects the expansion of the scope of use of this type of ceramic filter

[0004] The improved microporous ceramic filter plate disclosed in Chinese patent 200510038128 and its preparation are all composed of titanium dioxide micropowder, which can only resist the corrosion of microfluorine (10-20mg / l), and will be limited for pulp with a fluorine content greater than 20mg / l