Chromium Reducers

ADITOR® Cr

HEXAVALENT CHROMIUM REDUCING AGENTS FOR CEMENT

The Cr (VI) present in cement is a sensitizing agent that can cause dermatitis in people handling cement pastes, mortars and concretes, which can cause different levels of injury. To avoid this, Directive 003/53 / EC imposed on European cement manufacturers a limit of 2 ppm of Cr (VI) in their cements.

Since the presence of Cr (VI) in cement comes mainly from the oxidation of chromium present in certain materials used for their manufacture, the solution to the problem lies in the addition to the cement of an external chemical agent that can reduce the Cr (VI) – soluble – to Cr (III) – insoluble – which is then no longer absorbed by the skin.

PROQUICESA offers two different technologies which allows to solve Hexavalent Chromium issues, reducing the chrome (VI) content in cement to chrome (III), in a economical and easy way.

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ADITOR Cr-770

Features
High chemical stability, which allows to take advantage of 100% of the product, without generating waste
Low viscosity liquid product
It does not require special facilities for unloading, transfer and storage
It does not interfere with any of the other additives commonly used both by the cement manufacturer itself and, at a later stage, by the concrete manufacturer
How to use and dosage
It can be incorporated onto the feed material by means of a simple pumping system, being advisable to do so as close as possible to the inlet of the mill
The standard dose is 150 ppm additive / ppm Cr (VI) to reduce
In any case, depending on the characteristics of the cement and the installation, and based on the objectives pursued, the ideal dose will have to be determined in each case by carrying out the appropriate industrial tests

ADITOR Cr-6

Features
High chemical stability, which allows to take advantage of 100% of the product, without generating waste
Granular solid product, easy to handle, not dusty
Most economical solution in cement market
It does not interfere with any of the other additives commonly used both by the cement manufacturer itself and, at a later stage, by the concrete manufacturer
How to use and dosage
It can be incorporated upstream the separator, so downstream the mill output, on the conveyor just before the bucket elevator, by means of a simple hopper with endless screw
The standard dose is 200 ppm additive / ppm Cr (VI) to reduce
In any case, depending on the characteristics of the cement and the installation, and based on the objectives pursued, the ideal dose will have to be
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Founded in 1969, PROQUICESA S.L. is a family-owned company based in Madrid, fully dedicated to the research & development, manufacture and selling of chemicals for cement industry and a sustainable construction.
© PROQUICESA, Productos Químicos para el Cemento, S. L.

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