Cr6+ – Chromium (VI) Reduction

Cr6+ – Chromium (VI) Reduction

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Cr6+ is found in all cement based products

In its water-soluble form, chromium is harmful to humans and the environment.

Cr6+ – Chromium (VI) Reduction

Why Cr6+ must be reduced

highly irritating to skin

allergic skin reactions

causes ulcers

Cr6+ 100 times more toxic than Cr3+, cytotoxicity: 100 - 1000

leaching from raw concrete into drinking water

highly toxic to fish (food chain protection)

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EU requirements for chromium compounds

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Cement and cementitious mixtures may
not be used or placed on the market if
the soluble chromium VI content in the
dry mass of the cement after hydration
exceeds 2 mg/kg.

In the EU, the chromium(VI) content of
leather articles in contact with the skin is
limited to a maximum of 3 mg/kg.
Products exceeding this limit may not be
placed on the market.

 

MIG methods of chromate reduction

MODIFIED TIN (II) SULFATE

highest reduction power
easy to dose due to free flowing powder
only about 13 g per ppm Cr6+ per ton
neutral formulation
Formula Tin sulphate

ANTIMONY-(III) OXIDE

free flowing powder
dust-bound masterbatch
builds an insoluble complex
low costs
Formula Antimony trioxide

Advantages of the MIG methods in production

For Cement Plants

For Dry Mortar Plants

MIG chromate reducer products for cement plants

easy to handle
lowest maintenance cost on dosing equipment
most advanced methods of chromium reduction

MODIFIED TIN (II) SULFATE

add before or after the mill

POWDER

CEM-PROTECTOR® 1000 P

LIQUID

CEM-PROTECTOR® FL 19
CEM-PROTECTOR® FL 21

ANTIMONY (III) OXIDE

add before the mill

POWDER

Sb 574 No. 1445

LIQUID

SL 568 No. 1439

Environmentally friendly technologies

Phone

+49 (0) 5258 97 48 20

E-Mail

info@mig-mbh.de

Office hours

Monday - Friday
8 am - 5 pm

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