Changes in ceramics during the production process

The chemical changes of the clay during the grouting process: CaSO4 and the Na-clay and water glass in the mud have an ion exchange reaction: Na-clay＋CaSO4＋Na2SiO3→Ca-clay＋CaSiO3↓+Na2SO4 Gypsum acts as a flocculant to promote mud flocculation Harden, shorten the time of forming a blank. The chemical reaction of pottery clay during the firing process can be roughly divided into the following categories: 1. Decomposition of crystal water: In addition to surface water, the raw materials used in chinaware ceramic production will contain some compounds containing crystal water, and different raw materials will contain some Compounds of crystal water, such as kaolinite (2Al2O3·4SiO2·4H2O) when they are heated to a certain temperature, the crystal water will decompose, vaporize, and volatilize; 2. Decomposition of some carbonates: calcite is heated to a certain temperature It will decompose to produce CaO and CO2; 3. The solid-phase reaction between different oxides produces low melting point compounds: different proportions of silicon-calcium-magnesium-aluminum oxides will form different mineral structures at different temperatures, such as spinel, Feldspar, ashlar, pyroxene, etc., this is more complicated. Currently, it is generally determined by binary, ternary, or quaternary phase diagrams. Many formulas are confidential; 4. If the raw materials are used, there may be some special ones. The reaction, such as fluorine, mercury, arsenic and so on.

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