Method for producing petal shaped nano-magnesia by using rhomb spar

Abstract

The invention discloses a preparation method of petal-shaped nano-magnesium oxide by using dolomite. According to the preparation method, high purity nano-magnesium oxide with a rhombohedron-layer petal-like structure can be achieved by directly using dolomite which takes high-yield mineral as a raw material and by the way of combining the Sec acid leaching method and EDTA-ammonia complexion and precipitation reaction. With low preparing cost and simple process, the invention solves the problem that the mid-outcome nano-magnesium hydroxide is precipitant and is difficult to be filtered. the MgO produced by adopting the invention has the rhombohedron-layer petal-like structure which is in regular arrangement and epitaxial radial growth; and the purity of the produce is more than 99.83 percent; and the ration of the surface area is 114.37 m<2> / g, and 50 percent larger than ordinary Nano-magnesium products; the white degree is more than 97 percent, and is same to that of the high-quality titanium pigment; the purity of the by-product calcium chloride is more than 98.86 percent; and the purity of ammonium nitrate is more than 99.85 percent.

Description

Technical field: [0001] The invention belongs to the field of preparation of inorganic non-metallic materials, and relates to a method for preparing nano-magnesia, in particular, it relates to using dolomite minerals as raw materials to prepare rhombohedral sheet-like petals with high purity, high specific area, and high whiteness. The method of nano magnesium oxide. Background technique: [0002] Nano-magnesium oxide is a new type of high-function fine inorganic material. At present, coral-shaped nano-magnesia, icosahedral nano-magnesia, radially-grown nano-magnesia and porous rod-shaped nano-magnesia have been developed, which are especially effective for the research and application of nano-magnesia catalyst carriers and sterilization materials. development has far-reaching implications. And magnesium oxide products such as fibrous, layered, rod and ultrafine particles have been widely used in the modification of materials and the preparation of high-performance composi...

AI Technical Summary

Problems solved by technology

[0003] At present, the preparation of magnesium oxide from dolomite mainly adopts the two-stage carbonization method, but the process parameter control is not ideal, the comprehensive utilization rate of resources is low, the product purity and extraction rate are not very high, and the particle size is large and the specific surface area is relatively small. Low, basically spherical, with low added value; and this method requires that the MgO content in dolomite be more than 18%

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