Chromium Reducer for Cement — ART CHROM 9830 CM
A chromium(VI) reducing agent is an iron-salt additive that converts the soluble hexavalent chromium (Cr(VI)) present in cement into insoluble, far less hazardous trivalent chromium (Cr(III)). ART CHROM 9830 CM is a gray granular iron-salt powder manufactured by CHIMI ART in Egypt and dosed during cement production to control soluble chromate in line with EU regulations. The same reducing chemistry also serves iron oxide manufacturing, flotation in mining and remediation of chromate-contaminated land.
Product Overview
A chromium(VI) reducing agent is an iron-salt additive that converts the soluble hexavalent chromium (Cr(VI)) present in cement into insoluble, far less hazardous trivalent chromium (Cr(III)). ART CHROM 9830 CM is a gray granular iron-salt powder manufactured by CHIMI ART in Egypt and dosed during cement production to control soluble chromate in line with EU regulations. The same reducing chemistry also serves iron oxide manufacturing, flotation in mining and remediation of chromate-contaminated land.
Technical Specifications
- Appearance
- Gray granular powder
- Concentration
- Iron salt compound
- Solubility
- Water soluble
- Available Packaging
- 25kg bags · 50kg bags · Bulk
- Shelf Life
- 24 months
- Storage Conditions
- Dry, cool place
| Property | Value |
|---|---|
| Appearance | Gray granular powder |
| Concentration | Iron salt compound |
| Solubility | Water soluble |
| Available Packaging | 25kg bags · 50kg bags · Bulk |
| Shelf Life | 24 months |
| Storage Conditions | Dry, cool place |
Applications
Dosing Guidelines
The addition rate depends on the soluble Cr(VI) content of each clinker and cement, which varies with raw materials and kiln conditions. Typical rates are 0.05-0.5% by weight of cement, but the exact figure must be established by laboratory testing of every cement type. Dose the granules gravimetrically onto the clinker and gypsum feed to the finish mill so the reducer is ground and distributed homogeneously through the product. Verify performance by testing soluble Cr(VI) in the finished cement at routine intervals and after any raw-material change, because reducer demand shifts with clinker chemistry.
How It Works
Trace chromium enters cement clinker with the raw materials, and part of it is oxidised to the hexavalent state during kiln burning. When cement is mixed with water, this Cr(VI) dissolves as chromate — the species responsible for allergic chromate dermatitis among workers in contact with wet mortar and concrete. ART CHROM 9830 CM supplies reduced iron (Fe²⁺), which reacts with dissolved chromate, oxidising to Fe³⁺ while the chromium is reduced to the trivalent state. At the high pH of cement pore water, Cr(III) is essentially insoluble: it precipitates as hydroxide and stays locked in the hardened matrix rather than contacting the skin. The reducer is ground into the cement so it dissolves and acts immediately when water is added, and it retains its reducing capacity through the stated shelf life when stored dry.
Usage Tips
Store bags on pallets in a dry, cool warehouse, protected from moisture and humidity: iron-salt reducers gradually lose reducing capacity when exposed to damp air, so keep packaging sealed until the point of use. Shelf life is 24 months in unopened original packaging. Practise first-in, first-out stock rotation. Wear gloves, dust mask and goggles when handling the powder, and control dust at transfer points. The product is available in 25 kg bags, 50 kg bags and bulk deliveries with SDS and TDS documentation.
Certifications & Compliance
Frequently Asked Questions
Why must hexavalent chromium in cement be reduced?
Soluble Cr(VI) in wet cement causes allergic chromate dermatitis, an occupational skin disease of construction workers. European regulations therefore restrict soluble chromium(VI) in cement to trace levels, and producers add an iron-salt reducer to convert it into insoluble Cr(III).
How much ART CHROM 9830 CM is added per tonne of cement?
Typical addition rates are 0.05-0.5% by weight of cement, but the correct rate depends on the soluble Cr(VI) content of the specific clinker and must be set by laboratory testing, then re-verified after raw-material changes.
Where in the cement plant is the reducer introduced?
Most commonly it is metered onto the clinker and gypsum feed to the finish mill, so grinding distributes it homogeneously through the cement and it dissolves immediately when the cement is later mixed with water.
Why is dry storage critical for iron-salt reducing agents?
Moist air gradually oxidises the active iron, consuming reducing capacity before the product ever meets the cement. Stored dry in sealed packaging, ART CHROM 9830 CM keeps its declared activity for 24 months.
What applications does ART CHROM 9830 CM serve beyond cement?
The same iron-salt chemistry is used in iron oxide manufacturing, as a reagent in flotation for the mining industry, and in the remediation of chromate-contaminated land, in line with the product's listed applications.
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