Technical Data

ACUMER™ 9000 Mineral Slurry Dispersant

Description ACUMER™ 9000 is a sodium salt of an acrylic acid-based polymer. It is a highly effective dispersant for aqueous calcium hydroxide and magnesium hydroxide slurries.

Features and • Controlling phase separation Benefits • Reducing caking and clogging of equipment • Aiding the remixing of slurries after settling

Typical Properties Property Typical Value Appearance Clear, light amber solution Total solids, % 44 pH 7.5 Density (lb/gal, @ 25°C) 10.8 Brookfield viscosity, (mPa.s/cps @ 25°C) 500 These properties do not constitute specifications.

Performance Many problems can be encountered in producing calcium hydroxide or magnesium hydroxide slurries, including: • Wettability • Phase separation • Caking • Pumping • Pipe clogging • Remixing after setting • Slurry viscosity

Calcium Hydroxide Figure 1 shows the efficiency of ACUMER 9000 as a dispersant for 30% calcium hydroxide slurry.

Figure 1. ACUMER 9000 Dosage vs. Viscosity (30% Lime Slurry)

Page 1 of 4 ®™Trademark of The Dow Chemical Company (“Dow”) or an affiliated company of Dow Form No. 812-00352-0216BBI ACUMER™ 9000 / Dow Oil, Gas & Mining The following table shows the positive effect of ACUMER™ 9000 dosage on lime slurry stability. Lower dosage (0.2%) gives higher slurry viscosity and lower syneresis (liquid phase separation). The desired slurry properties can be controlled by optimizing the dispersant dosage.

Effect of ACUMER 9000 Dispersant on 30% Lime Slurry1 Stability

After 8 Days at Room Temperature Initial Make-Down Dosage, % (solids basis) Syneresis Gel3 Flowed4 Viscosity2 0.2 2080 1.7 98.3 93.3 0.4 810 12.0 88.0 97.1 0.6 382 16.5 83.5 96.3 130% lime slurry was prepared by mixing 210 grams of slaked lime with 490 grams of deionized water (including additives) for five minutes in a Waring blender at high speed. 2Brookfield RVT, #2 spindle, 20 rpm, 23°C 3Slurry phase 4Percent weight flowed when container is inverted for two minutes

Magnesium Hydroxide Figure 2 shows the efficiency of ACUMER 9000 as a dispersant for 50% magnesium hydroxide slurry. ACUMER 9000 dispersant allows slurry properties to be maximized according to the mixing environment and the type of magnesium hydroxide.

Figure 2. ACUMER 9000 Dosage vs. Viscosity (50% magnesium hydroxide slurry)

Brookfield Viscosity, RVT, #2 @ 20 rpm, 23°C

Ceramic Applications ACUMER dispersants benefit most ceramic applications whether it be kaolin slurries, ball clay Replacement for slurries, or ceramic slip grinding and dispersion. ACUMER dispersants aid in: Phosphates (STPP) • Wettability • Grinding • Slip viscosity • Slip stability

Figures 3 and 4 show the relationship of slip viscosity versus slip solids for two ceramic tile manufacturers. In both cases, the ACUMER polymers outperformed STPP even at the higher STPP dosage, and the rapidly increasing cost of phosphates make the ACUMER polymer option even more attractive.

Page 2 of 4 ®™Trademark of The Dow Chemical Company (“Dow”) or an affiliated company of Dow Form No. 812-00352-0216BBI ACUMER™ 9000 / Dow Oil, Gas & Mining Figure 3. Ceramic Slip A – Effect of Slurry Solids on Viscosity

Figure 4. Ceramic Slip B – Effect of Slurry Solids on Viscosity

Figure 5 shows the relationship of specific gravity to solids for a typical ceramic slip. The ceramic mix was wet ground to 5% retained on 200 mesh screen. This relationship held for all dispersants tested on this particular slip.

Figure 5. Ceramic Slip A – Effect of Slurry Solids on Slurry Density

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