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PURAL MG 30
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PURAL MG 30

PURAL MG 30 is aluminum magensium hydroxy carbonate. It has a 30:70 MgO:Al2O3 ratio. Hydrotalcites have a double-layered metal hydroxide structure consisting of magnesium and aluminium hydroxide octahedrons interconnected via the edges. Additional interstitial anions between the layers compensate the charge of the crystal and determine the size of the interlayer distance (basal spacing).
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Product Background

The collected and refined know-how to produce alumina hydrates via the sol-gel technique is used by Sasol to prepare other inorganic oxides or mixed oxides. The properties of these inorganic specialty materials are leading Sasol into new, interesting fields of research and application. One of these specialties is the hydrotalcite family (aluminium-magnesium compounds) which is obtained by hydrolysis of mixed alcoholates. Compared to alumina hydrates, hydrotalcites are even more alkaline in nature. Basicity is adjustable by increasing the Mg/Al ratio and/or incorporating anions other than OH-. Hydrotalcites have a double-layered metal hydroxide structure. The layers consist of magnesium and aluminium hydroxide octahedra sharing edges. Additional interstitial anions between the layers compensate the charge of the crystal and determine the size of the interlayer distance (basal spacing). While hydrotalcites are accessible through the corresponding metal salts, the metal alcoholate route, patented by Sasol, has advantages over other synthesis routes. Most important is that the Al/Mg ratio can be varied over a wide range. In addition, it is now possible to obtain hydrotalcites with a purity and a controlled anion content that have to date been unavailable.

Applications & Uses

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Properties

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Chemical Properties
ValueUnitsTest Method / Conditions
Magnesium Oxide : Aluminium Oxide Content30 : 70%-
L.O.I.max. 40%-
Carbon Content0.5 - 3%-
Silicon Dioxide Contentmax. 350ppm-
Ferric Oxide Contentmax. 200ppm-
Na, Ca, Ti eachmax. 50ppm-
Physical Properties
ValueUnitsTest Method / Conditions
Surface Areamin. 250m2/g-
Pore Volumemin. 0.5ml/g-
Loose Bulk Density350 - 550g/l-
Particle Size Distribution
ValueUnitsTest Method / Conditions
Maximum 25 μmmin. 20%-
Maximum 45 μmmin. 40%-
Maximum 90 μmmin. 85%-

Technical Details & Test Data

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Functional Materials for Corrosion Protection

Layered double hydroxides of hydrotalcite structure are well known to be active in corrosion protection, especially in Chloride Induced Steel Corrosion in reinforced  Concrete. This effect is largely due to their ability to act as anion exchange materials,
in which largely unwanted corrosives like chloride can be trapped inside the structure. Hydrotalcites consist of a layered structure where carbonate and water molecules are contained within two layers of magnesium and aluminium hydroxide octahedra sharing edges

Hydrotalcites are produced by Sasol Germany GmbH under the tradename PURAL MG. This is done by their proprietary mixed metal alkoxide based sol-gel process which allows tailor made products of high purity. In contrast to alternative methods like precipitation, the Al/Mg ratio can be precisely adjusted over a wide range and unwanted anions are completely avoided. PURAL MG is easy to disperse into any formulation and can be applied as coating on steel.

Before being effective as corrosion inhibitor, PURAL MG must be activated. One  effective way of doing this is by mild thermal treatment in order to remove carbonate ions. Additionally, carbonate ions can also be replaced by corrosion inhibitors like phosphates, nitrates or amino acids. If these hydrotalcites are incorporated into concrete or coated on steel, these inhibitors are released in a controlled manner and corrosive agents like Cl anions are trapped simultaneously inside the structure.

Sasol PURAL MG 30 Functional Materials for Corrosion Protection - 1

Sasol PURAL MG 30 Functional Materials for Corrosion Protection - 2

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Regional Availability

Most Viewed Documents

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PURAL MG Series Technical Data Sheet
Technical Data Sheet
PURAL MG 63 HT, PURAL MG 30, PURAL MG 70
Technical Data Sheet
Products: PURAL MG 63 HT, PURAL MG 30, PURAL MG 70
Layered Double Hydroxides Brochure
Brochure
PURAL MG 63 HT, PURAL MG 30, PURAL MG 70
Brochure
Products: PURAL MG 63 HT, PURAL MG 30, PURAL MG 70
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