Dibya. Scale inhibitor will not remove the scaling layer of CaSO4. Once it has been formed, Poly acrylic acid or poly phosphonate will not dissolve the scaled layer. Scale inhibitor only controls the scaling phenomena in the early stage (Nucleation step) or in moderate stage through adsorption on the particles that intended to form crystals and prevent the crystal growth. Only the optimum solution to prevent scale is to revise the operation parameters and design, and try to keep the recovery under the limit that initiate scale. There are many programs that predict the scale and giving alarm for the treatment and operation process.  Calcium sulfate scaled layers are not dissolved in mineral acid such HCl & H2SO4, using an alkaline solution such NaOH which increases the solubility of sulfate scale. Calcium sulfate scaled layer is different than other scale such calcium carbonate which is easily dissolved in diluted mineral acid, sometimes sulfate scaled layer becomes a hard and rough which almost difficult to be cleaned.

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Dibya. Scale inhibitor will not remove the scaling layer of CaSO4. Once it has been formed, Poly acrylic acid or poly phosphonate will not dissolve the scaled layer.

Scale inhibitor only controls the scaling phenomena in the early stage (Nucleation step) or in moderate stage through adsorption on the particles that intended to form crystals and prevent the crystal growth.

Only the optimum solution to prevent scale is to revise the operation parameters and design, and try to keep the recovery under the limit that initiate scale. There are many programs that predict the scale and giving alarm for the treatment and operation process. 

Calcium sulfate scaled layers are not dissolved in mineral acid such HCl & H2SO4, using an alkaline solution such NaOH which increases the solubility of sulfate scale.

Calcium sulfate scaled layer is different than other scale such calcium carbonate which is easily dissolved in diluted mineral acid, sometimes sulfate scaled layer becomes a hard and rough which almost difficult to be cleaned.