GRINDING AIDS

DESCRIPTION

ACA-682 is a chemical additive used as a cement constituent (European standard EN 197, point 5.5) to improve the manufacture and the properties of the cements. ACA-682 is an aqueous solution of selected alkanolamines and polyalcohols.

RECOMMENDED ADDITION RATE

Addition rate of ACA-682 is typically in the range of 150-500 g/t of treated cement. However the optimum addition rate of ACA-682 depends on the characteristics of the material and the grinding circuit and is normally assessed through industrial tests. Deviation from the optimum cannot guarantee the expected results and could have an impact on the cement characteristics. Overdosing can lead to a reduction in mill retention time and a possible loss of grinding efficiency, together with “mill flushing’’ and excessive flowability.

BENEFITS

  • ACA-682 is a grinding aid for cement, which reduces the tendency of re-agglomeration of the fine particles, formed during the comminution process.
  • ACA-682 permits improvements of the flowability of the finished cement, of the efficiency of the mill and separator and thus increases the production rate with a corresponding reduction in grinding energy consumption.
  • Cements produced with ACA-682 have a lower pack-set tendency and hence can provide advantages during loading and unloading operations

TYPICAL APPLICATIONS

ACA-682 can be used for the grinding of most cements in open and closed circuit systems.

Main applications are:

  • Portland cements
  • Portland blended cements
  • Pozzolanic cements
  • Blastfurnace slag cements

HOWTO USE

ACA-682 should be added on to the feed belt or injected pure or diluted (also with the cooling water) into the mill.