1985-10-01_REVISION - C1981012 - Laserfiche WebLink

Home Browse Search

C~ L • • Improves quality of recycled water • Reduces solids carryover • Increases density and improves dewaterability o/sludge • Improves filter cake recovery PRINCIPAL UBE9 • Thickening • Clarification • Dewatering • Filtration OENEAAL DE9GRIPTIDN NALCO 8852 is a moderate molecular weight, liquid cationic coagulant. Its molecular configura- tion provides functional groups that improve settling, clarification, thickening and dewatering of mineral processing slurries. Charge in Solution ...... ..........Cationic Appearance ............ .......Slight haze Color .................. .......Pale amber Odor ................. ............Slight pH (Neatl .............. ..............4.5 Viscosity .............. ......See Figure 1 Freeze Point ........... .............14°F Density ............... ........9.091b/gal DOSAGE Clarification and Thickening ..............1-20 ppm Dewatering Aid .......................5-201b/ton FEEDING Concentrated solutions of NALCO 8852 are corrosive to lead, copper alloys, aluminum, and mild steel. Mild steel tanks, pumps, and lines are satisfactory for handling dilute (less than 10%1 solutions. Care must be exercised in selecting pumps for undiluted NALCO 8852 in cold climates, as low temperatures increase product viscosity. Figure 1 depicts NALCO NALCD CHEMICAL COMPANY MINING/MINEPAL PRGCEBBING CMEMICALB 290'1 BU TTEq F~ELCI ROOD :l ^GK Bg00K. ILL~N 015 b0521 9UBSIOILgiES IN pUBTRIA. BRG21 L, COLCMBIG. FgpNCE ITALY. ME%ICO. nIUPPINES. SPnIN. SWEDEN, uN~TEC STgTES. VENEZUEL4. 4N0 WEST G ERMGNY Y E~LIGi ES ~N 4U 9Tq pLi L. CYN60<. nC]LLLNO. J4PYN. SDUTr~ pFRIC G. TGIWGN. JNITgO KINGOCIM iNO UNIiE CI 9TYTE9. ~~o MerlstxreL GaEemarws of Yarca Chemmal COmpd01 o PnnleO In U S.A. Il 17 8852 viscosity as a function of temperature. If low ambient temperatures will be encountered, avoid long transfer lines or provide these lines with heat tracing and insulation. NALCO 8852 can be fed neat or as a diluted stock solution. When preparing a stock solution in warm water IfiO°F or over) 5 minutes mixing is sufficient. For colder water, additional mixing would be required. Use a positive displacement pump to meter the product or solution into a water line where it can be continuously diluted before application. Product application point is best determined by plant evaluation. Normally, application sufficiently upstream to ensure vigorous agitation and provide complete mixing is necessary for good coagulation. In some circuits, however, it has been found that Nalco coagulant added directly to the slurry at, or very shortly before, the thickener centerwell yields superior results. Stability of the coagulated particles is always an important consideration. Jar and cylinder tests are helpful in determining the effect of agitation of flocculated particles. In filtration applications, it is extremely important to feed the NALCO 8852 so that all solids in the heavy slurry are adequately conditioned. Usually, a distribu- tion header box feeding the filters is an ideal spot for application. When NALCO 8852 is used in conjunction with high molecular weight anionic (or nonionic) polymer, check relative points of application to determine which product should be fed first. The best application point should give the best all around clarity, settling rate, and underflow density. (Continued on Reverse Sidel 8852