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Using the SZP-04 or SZP-06 electordes to analyze calcium carbonate in slurry and measure the influence of dilution.

Introduction Calcium carbonate is a white pigment used as a filler in alkaline papermaking.

Method Determination of the zeta potential

Sample Slurry of calcium carbonate with dispersant

Solid Content 1 - 65%

Sample Preparation First, the slurry is measured undiluted. Subsequently, the solid content is reduced by adding definite amounts of deionized water.

Equipment SZP-04 or SZP-06, special electrodes for pigment slurries, filter circle (black ribbon)

Result Many particle slurries have to be diluted before the application, because the solid content of the commodities is often very high.

Increasing dilution of the tested product leads to desorption of the dispersant from the surface of the calcium carbonate particles. This results in a decreasing zeta potential. Dilution of the slurry leads to a destabilized dispersion because of a reduced surface charge of the calcium carbonate particles. Reduced repulsive forces between particles cause agglomeration and unwanted particle size increase. Such products cannot be stored and no longer fit with process demands.

Determining the zeta potential thus helps to evaluate the properties of the product under process conditions, ie is enough dispersant adsorbed on the particle surface after dilution to guarantee specific properties? The optimal dispersant can also be selected this way.

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