In industrial circulating water treatment, does silicate combine with calcium ions to form scale?
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In industrial circulating water treatment, does silicate combine with calcium ions to form scale?
The solubility product of calcium silicate is relatively high; if the silicate concentration isn’t too high, essentially no calcium silicate precipitation will occur. Magnesium silicate has an even lower solubility product, so be careful of the formation of magnesium silicate scale!
In circulating cooling water, when the silica content is too high and the water hardness is also high, it is easy for silicic acid to form together with calcium ions, resulting in calcium silicate scale; such scale is difficult to remove, so it should be avoided as much as possible. Generally, the SiO2 content in circulating cooling water is controlled to be no more than 175 mg/L.