Struvite-K and Syngenite Composition for Use in Building Materials

摘要

A composition and process for the manufacture thereof for use in a hybrid building material comprising at least in part Syngenite (K2Ca(SO4)2.H2O) and Struvite-K (KMgPO4.6H2O). Specified constituents, including magnesium oxide (MgO), monopotassium phosphate (MKP) and stucco (calcium sulfate hemihydrate) are mixed in predetermined ratios and the reaction proceeds through multiple phases reactions which at times are proceeding simultaneously and in parallel and reaction may even compete with each other for reagents if the Struvite-K reaction is not buffered to slow down the reaction rate). A number of variable factors, such as water temperature, pH mixing times and rates, have been found to affect resultant reaction products. Preferred ratios of chemical constituents and manufacturing parameters, including predetermined and specified ratios of Struvite-K and Syngenite may be provided for specified purposes, optimized in respect of stoichiometry to reduce the combined heat of formation to non-destructive levels.

主权项

1. A process for the continuous manufacture of a composition for use in a building product comprising:
a) providing a mixer reaction chamber; b) continuously feeding predetermined constituent materials into the mixer reaction chamber; c) continuously mixing the predetermined constituent materials within said mixing reaction chamber to produce a slurry; d) withdrawing the slurry from the mixer reaction chamber; and e) utilizing said slurry in the manufacture of a building product;wherein said predetermined solid constituent materials comprise the following in specified ranges by weight percent:MgO: 3.33 to 70.00%KH2PO4: 4.67 to 70.00%stucco hemihydrate CaSO4.½H2O: 10.5 to 90.0%all adding up to 100%and addition of water: 20.0 to 40.0% of the constituent solid materials.