A process is disclosed for the production of acidic solutions of activated silica for water treatment. Activated silica is formed during the process of acidifying a sodium silicate solution to below pH 4 with sulfuric acid. A polyvalent metal salt is then added to stabilize the acidified activated silica.

 
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> Highly pure hafnium material, target and thin film comprising the same and method for producing highly pure hafnium

> Reducing mercury emissions from the burning of coal
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