Magnesium hydroxide

A magnesium hydroxide, magnesium oxide technology, applied in magnesium hydroxide, conductors, cables, etc., can solve problems such as health risks, scarcity of minerals, and continuous demand

Inactive Publication Date: 2011-08-10
IMERYS MINERALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, natural deposits of magnesium hydroxide (brucite) are very rare and are often contaminated with fibrous ores, some of which (such as asbestos) pose serious health risks
The current synthetic form of magnesium hydroxide is relatively expensive, so there is a continuing need for alternative and cost-effective methods of making magnesium hydroxide suitable for use as a flame retardant

Method used

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preparation example Construction

[0066] The preparation of the polymeric compositions of the present invention may be accomplished by any suitable mixing method known in the art, which methods will be apparent to those skilled in the art. The method involves dry blending of the individual components or their precursors, and subsequent processing in a conventional manner.

[0067] For thermoplastic polymeric compositions, the processing can include melt mixing either directly in the extruder used to make articles from the composition, or premixed in a separate mixing device such as a Banbury mixer. Alternatively, the dry blend of the components can be directly injection molded without pre-melt mixing.

[0068] When the filler material produced according to the invention contains more than one component, it can be prepared by intimately mixing its components together. The filler material is then suitably dry blended with the polymer and any desired additional components prior to processing as described above. ...

Embodiment 1

[0081] Samples of ground ore were loaded into refractory trays in a gas fired kiln manufactured by CGE, Skelmersdale, UK. The correct temperature for calcination is determined by DSC / TGA analysis of the minerals. For magnesite and dolomite samples, a 1 hour programmed period at about 850°C is appropriate.

[0082] 400 g of dry calcined feedstock for each sample was added to 4 liters of 50°C water in a stirred stainless steel vessel over 30 minutes and the temperature was maintained at 50°C by electrical heating. Afterwards, the suspension was screened to remove all particles larger than 53 μm. The screened suspension was allowed to cool and stand for 16 hours (overnight). The clear supernatant was then decanted and the remaining (thickened) suspension was vacuum filtered using standard laboratory Buchner filtration equipment. The obtained filter cake was dried at 80° C. to constant weight using a forced air oven. Post-drying milling was performed using a laboratory Fritsch...

Embodiment 2

[0103]The flame retardant MDH filler (sample C) was prepared by calcining magnesium carbonate (95% pure by X-ray diffraction analysis) at 800°C followed by aging at 40°C followed by a simple settling step to provide a refined product, There are basically no particles larger than 20 μm in its particle size distribution. In Table 4 the physical properties of this filler are compared with a commercially available hydrotalcite mineral (Hydrofy G2.5, obtained from Nuova Sima).

[0104] Table 4

[0105]

Commercially available hydrotalcite

Sample C

[0106] Decomposed TGA loss*(%)

23.2

25.4

Surface area (m 2 / g)

7.0

22.4

CILAS d 50 ** (μm)

5.7

2.5

CILAS d 90 (μm)

24.6

7.9

CILAS d 99 (μm)

43.0

14.0

MgO(%)

56.3

64.6

CaO(%)

6.5

1.8

Fe 2 o 3 (ppm)

2560

2000

Mn(ppm)

161

100

[0107] As deta...

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Abstract

Methods for making magnesium hydroxide are described.

Description

technical field [0001] The present invention relates to the manufacture of magnesium hydroxide (Mg(OH) 2 ) method and the purposes of the magnesium hydroxide, especially as flame retardant in articles such as cables. Background technique [0002] Magnesium hydroxide is widely used as a flame retardant. However, natural deposits of magnesium hydroxide (brucite) are very scarce and are often contaminated with fibrous ores, some of which, such as asbestos, pose serious health risks. The current synthetic form of magnesium hydroxide is relatively expensive and there is a continuing need for alternative and cost-effective methods of making magnesium hydroxide suitable for use as a flame retardant. Contents of the invention [0003] A first aspect of the present invention provides a method of manufacturing magnesium hydroxide, the method comprising: [0004] calcining a source of magnesium carbonate to form magnesium oxide; and [0005] slaking magnesium oxide in water; [...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F5/14C09K21/02
CPCC01P2006/82C09K21/02C01P2002/88C01P2004/61C01P2006/80C04B2/10C01P2006/10C01F5/16H01B7/295C01P2006/12
Inventor 理查德·鲍恩杰里米·约翰·霍佩尔安德鲁·马克·赖利戴维·罗伯特·斯丘斯
Owner IMERYS MINERALS
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