Water Treatment Technology

CIRCOSIL® - synthetic multifunctional mineral

Sustainability and responsibility for our environment are taken literally at Cirkel.

This is demonstrated, not only in our choice of natural raw materials lime, sand and water and conservation of resources, but also in our cooperation with experienced and competent partners from water treatment technology. 

CIRCOSIL® is:

  • a synthetic produced CalciumSilicateHydrate based on the natural mineral tobermorite
  • available with defined granulate grain distribution, specially for your use
  • practically insoluble in water
  • slightly alkaline
  • highly porous with a high specific surface and highest porosity

CIRCOSIL® effects:

  • provision of a local alkaline pH value
  • alkaline buffer effect due to mineral solid nature
  • binding of water soluble heavy metal kations
  • binding of solube phosphates
  • excellent hydrodynamic flow properties

CIRCOSIL® is used...

as additive for heavy metal precipitation

  • ... in groundwater remediation
  • ... in surfacewater remediation
  • ... in rain water treatment

as crystallisation nuclei in phosphate removal

Katja Kolodzi
Produktmanager - Absorber / Wassertechnik
Katja Kolodzi
Dr. Maria Becker
Research and Development
Dr. Maria Becker

CIRCOSIL® - General technical details

Chemical composition 5 CaO - 6 SiO2 - 5 H2O
CalciumSilikatHydrat
Porosity 1,4 cm3/g
SiO2 55,50 % CaO 33,50 % pH value
10
Al2O3 0,43 % MgO 0,33 % specific surface (BET) 65 m2/g
Fe2O3 0,11 % Na2O < 0,02 % glow loss 10,0 %
Mn < 0,001 % Cr < 0,001 % Standard grain classes CIRCOSIL® 0,1
CIRCOSIL® 0,5 
CIRCOSIL® 1,5 
CIRCOSIL®  Grobkorn
Mineral composition
Tobermorit 88 %
embedded SiO210 %


Brightness (CieL*a*b*) L* = 93
a* = 1,0
b* = 2,45

CIRCOSIL® - Technical application data

Eluate analysis according to DIN-38414 S4

Heavy metals
Physical Data
(filtered in eluate)
Arsenic (As) DIN EN ISO 11885 mg/l < 0,1 
pH-Wert DIN 38404 C5 10,4 Lead (Pb) DIN EN ISO 11885 mg/l < 0,1
Organic components
(centrifuged in eluate)
Cadmium (Cd) DIN EN ISO 11885 mg/l < 0,01
TOC (org. C gesamt) DIN EN 1484 mg/l 9,3 Chrome (Cr) DIN EN ISO 11885 mg/l < 0,01
Water intake 130 % Copper (Cu) DIN EN ISO 11885 mg/l < 0,01
Bulk density 400 - 500 kg/m³ Nickel (Ni) DIN EN ISO 11885 mg/l < 0,03
Miscellaneous Quecksilver (Hg) ges. DIN EN 1483 mg/l < 0,001
Chlorid (water soluble) 0,002 M.-% Zink (Zn) DIN EN ISO 11885 mg/l < 0,01
Sulfate < 0,1 M.-%
These values are based on dry matter in mg/l. The respective heavy metals are almost completely under the detection limit.

Environmental particle sizes

Topcut [mm] Median [mm] Umwelttechnick Partikelgrößen
CIRCOSIL® 0,5 0,7 0,3
CIRCOSIL® 1,5 1,8 1,0
CIRCOSIL® Grobkorn 4,2 2,5

Deliverable as

CIRCOSIL® 0,1 CIRCOSIL® 1,5
CIRCOSIL® 0,5
CIRCOSIL®  Grobkorn
Loose in silo truck Loose in silo truck Loose in silo truck
1,5 m3 Q-Bag
on disposable industrial pallet
  • Weight approx. 900 kg/Q-Bag
  • Measurement including pallet
    L x B x H: 100 cm x 120 cm x
    approx. 200 cm

1 m3 Big Bag
on disposable industrial pallet

  • Weight according to graining
    approx. 550 - 700 kg/Big Bag
  • Measurement including pallet
    L x B x H: 100 cm x 120 cm x
    approx. 150 cm
1 m3 Big Bag
on disposable industrial pallet
  • Weight approx. 400 kg/Big Bag
  • Measurement including pallet
    L x B x H: 100 cm x 120 cm x
    approx. 150 cm
Paper sacks
foiled on returnable EURO-pallet
  • Sacks of 25 kg, 975 kg/pallet
  • Measurement including pallet
    L x B x H: 80 cm x 120 cm x
    approx. 200 cm
Paper sacks
foiled on returnable EURO-pallet
  • Sacks of 25 kg, 825 kg/pallet
  • Measurement including pallet
    L x B x H: 80 cm x 120 cm x
    approx. 200 cm
Paper sacks
foiled on returnable EURO-pallet
  • Sacks of 20 kg, 600 kg/pallet
  • Measurement including pallet
    L x B x H: 80 cm x 120 cm x
    approx. 180 cm
Special packaging on request

Processing information

Filling Material/
Pigment area
Cirkel GmbH & Co. KG
Werk Emsdetten
Veltrup 22 A
48282 Emsdetten 
Tel.: +49 2572 9231-0
Fax: +49 2572 9231-159
VAT number DE 127 124 151
Bank account National-Bank Recklinghausen
BLZ 360 200 30
Kto-Nr. 690 201
BIC/SWIFT NBAGDE3EXXX
Company location
Cirkel GmbH & Co. KG 
Flaesheimer Str. 605 
45721 Haltern am See 
Kommanditgesellschaft 
(Reg.-Gericht Gelsenkirchen HRA 2888) 
Persönlich haftende Gesellschafterin: 
Cirkel Beteiligungsgesellschaft mbH Haltern 
(Reg.-Gericht Gelsenkirchen HRB 11178)
IBAN DE 59 360 200 30 0 000 690 201
Customs number 3288579
Statist. Commodity code 28 39 90 00

Registry data

Register data

Safety data sheet

Test certificates

Mit dem Absenden meiner Daten erkläre ich mich damit einverstanden, dass diese von Cirkel gespeichert und zu Zwecken der Kontaktaufnahme in Bezug auf meine Anfrage, der Eigenwerbung, Terminen und Informationen verwendet werden. Personenbezogene Daten, Privatadressen und E-Mail Adressen werden selbstverständlich vertraulich behandelt und nicht an Dritte weitergegeben.

with * marked fields are mandatory

Safety data sheet

Register data

Safety data sheet

Test certificates

Mit dem Absenden meiner Daten erkläre ich mich damit einverstanden, dass diese von Cirkel gespeichert und zu Zwecken der Kontaktaufnahme in Bezug auf meine Anfrage, der Eigenwerbung, Terminen und Informationen verwendet werden. Personenbezogene Daten, Privatadressen und E-Mail Adressen werden selbstverständlich vertraulich behandelt und nicht an Dritte weitergegeben.

with * marked fields are mandatory