Aluminosilicate complexes

In the case of the alkali aluminosilicate complexes, NMR, mass spectrometry TGA ceramic yield and ceramic product purity analyses support the formation of simple trimetallic precursors of the type 15. 

A range of aluminosilicate solutions were investigated. The gelation behaviour, the species in solution (as observed by NMR) and the zeolite crystallization products are described. The effect of concentration and type of alkali metal cation present in solution gives information about the formation of aluminosilicate complexes and how they interact, under the influence of the cation, to form an aluminosilicate gel, the precursor to zeolite crystallization. 

This proved extremely informative. Aluminosilicate complexes were observed in every solution studied. Although the spectra measured are of solutions undergoing change, the time taken to collect the data was generally small compared with the gel time. Figure 5 shows spectra for the nine representative potassium aluminosilicate solutions. A summary of the shifts is given in Table II. 

During the first restructuration of the silicate or Si-rich aluminosilicate complexes prior to the zeolitic nucleation, the HM++ entities play a structure stabilizing role. By their particular linear shape, they favour the formation of channel systems. Simultaneously, they can also neutralize one AIO2- negative center of... 

The collapsed kaolinitic structure acts as a source or framework for several different aluminosilicate complexes formed in HTA ash samples. Common minerals found are as follows anorthite... 

If solutions of sodium silicate and aluminate, having the same pH and resistance, are mixed, and if the concentrations are so low that gel formation does not occur, then a considerable increase in conductivity is noted. This must be due to formation of soluble aluminosilicate complexes."""... 

Relative to the behavior of zeolites in biological systems, a biozeo-litic theory of sewage purification was proposed more than 30 years ago. It was reported then that sewage clarification by the so-called activated sludge process depends on the presence of an aluminosilicate complex which is said to be chemically the same as zeolites (76). 

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