MA.P.E./Cr 05 LV

A brand new technology for Cr(VI) reduction

MA.P.E./Cr 05 LV

Product characteristics:

• Low viscosity liquid: the dosage is very easy and precise, even at very low amounts

• Shelf storage life: more than 3 months, when stored correctly

• Reducing effect on ground cement: minimum 6 months

• Dosage: 40-50 g/t of cement for each ppm of Cr(VI) to be reduced

• Specific gravity: 1,22 g/cm3

• pH: 9,5±1,5: no acid pH and no corrosive properties

• Available also in low freeze grade (stable until -15°C)

MA.P.E./Cr 05 LV

How does it work?

The MA.P.E./Cr 05 LV is a water suspension of a reducing agent based on antimony(III) (21% active component).

The reducing agent is soluble only at very alkaline pH: the Sb3+ is available for Cr(VI) reduction only when cement is mixed with water, and can not be oxidised during cement milling or storage, even at high levels of temperatures and high humidity conditions.

The Sb3+ is less acid than Sn2+ or Fe2+, and can not be deactivated after reaction with free lime: the reducing agent is effective also with clinkers with high free CaO content.

MA.P.E./Cr 05 LV: maintenance of the reducing properties

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Cr(VI) content of cement

MA.P.E./Cr 05 LV – 37 g/t·ppm

MA.P.E./Cr 05 LV – 43 g/t·ppm

MA.P.E./Cr 05 LV: efficacy of the reducing properties Clinker with 1,78% free CaO.

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0,2% ferrous sulphate

20 g/t·ppm stannous sulphate

45 g/t·ppm MA.P.E./Cr 05 LV

MA.P.E./Cr 05 LV: example of cost calculation

Practical example: cement with 5 ppm of soluble Cr(VI)

Target: reduction from 5 to 1 ppm

Dosage: 4 ppm · 45 g/t·ppm = 180 g/t

Price: 2,2 €/kg

Economical impact: 2,2 €/kg · 0,180 kg/t = 0,396 €/t

In some cases the MA.P.E./Cr 05 LV can have an impact lower than iron sulfate

Mill output 33 t/h

ppm Cr(VI) 15

Reducing agent SnSO4 MA.P.E./Cr 05 LV

Price 6,5 €/kg 2,2 €/kg

Dosage0,300 kg/t

(20 g/t·ppm)

0,750 kg/t

0,660 kg/t

Economical impact 1,95 €/t1,65 €/t

1,45 €/t

% saving --15.4%

-25.6%

MA.P.E./Cr 05 LV: economical advantages in comparison to SnSO4

Dosage: 44 g/t·ppm

Dosage: 50 g/t·ppm