| Sources and perperties│Uses│Trend
Sources and perperties
Brucite is hexagonal mineral and native magnesium hydroxide
occurs in serpentines and impure limestone, hardness is 2.5
on Moke scale and specific gravity is 2.38-2.40.
Brucite is a semi-rare mineral, before had not been found
in China on large scale. Since mid 1990's, large deposit of
brucite has been found in China, most commercialy valued mines
are located in Fencheng city(formerly a county of Dandong).
Up to now, over 4 million tons of reserve has been found in
Brucite is often used as flame retardant filler in plastic
industry and paper-making industry; as additive in chemical
fertilizer; in environmental protection field, magnesium industry,
medical industry ; it is also used as furnace additive in
Recent years the application of brucite develops fast in many
areas, partly because of the emerging of advanced technological
solution. The bright future for brucite may be illustrated
by the following two examples.
converter steel-making industry
Calcined brucite lump is being introduced to replace caustic
calcined magnesite ball which is currently widely used in
slag splashing converter maintenance. Compared with caustic
calcined magnesite ball, calcined brucite lump has higher
composition of MgO, more suitable fluidity, better reactivity,
it could improve the composition of MgO in slag, lengthen
the serverce life of converter and reduce the frequency of
magnesia brick replacement, thus lower the production cost,
now this technique has been applied successfully by some steel
manufacturers in Japan.
flame retardant industry
Because of the advantages of mineral fillers(mainly ATH and
Magnesium hydroxide) in terms of smoke generation, toxicity,
and environmental aspects, they will outpace the more traditional
compounds in flame retardant industry.
Although currently ATH is the most important flame retatdant
among mineral fillers, it should be noted that magnesium hydroxide
is the most fastest growing part. Compared with ATH, Magnesium
hydroxide has a lower smoke generation, higher temperature
stability field (up to 340℃) than ATH (200℃) , which allows
the processing with a wide variety of thermoplastics, eg.
polypropylene or nylons. The recent technological breakthrough
in overcoming some of disadvantages of magnesium hydroxide(e.g.
impurity or high loading") greatly increases its market potential.