Boron production

Boron. Virtually all United States boron production and about three-fifths of the world production comes from bedded deposits and lake brines in California. U.S. reserves are adequate to support high production levels. Turkey is the only other boron-producing country of significance. Only about 5% of boron production is used in agriculture. 

Lower Oxides. A number of hard, refractory suboxides have been prepared either as by-products of elemental boron production (1) or by the reaction of boron and boric acid at high temperatures and pressures (39). It appears that the various oxides represented as B O, B O, B22O2, and B23O2 may all be the same material ia varying degrees of purity. A representative crystalline substance was determined to be rhombohedral boron suboxide, B12O2, usually mixed with traces of boron or B2O3 (39). A study has been made of the mechanical properties of this material, which exhibits a hardness... 

Boron production remains quite low despite the element s desirable properties of hardness and low density. 

Both chemical methods and float zoning are used to purify the boron product from the foregoing processes. In the latter method, a boron of 99.99% purity can be obtained. 

It was concluded that the "boron product used above was of no value for use in AN/TNT expls because of its deleterious effects on the stability and brisance values of such raixts. Also, it was concluded that the Boronite expls "A, "B C offered no advantages over TNT or other std expls now being used (Ref 2)... 

We report (i) isomorphous substitution of boron, by secondary synthesis, into silicalite and into highly siliceous (Si/Al>400) ZSM-5 and (ii) an improved direct synthesis of zeolite (Si,B) -ZSM-5. The chemical status of B in die boronated products depends upon reaction conditions. Careful control of the concentration of the base, the borate species and of die duration of treatment, allows the preparation of samples containing only 4-coordinated B or a mixture of 3- and 4-coordinated B in various relative concentrations. The products were characterized by magic-angle-spinning (MAS) NMR and infrared (IR) spectroscopies and by powder x-ray diffraction (XRD). 

Figure 7—56. Boron production by direct decomposition of its trifluoride (BF3) in atmospheric-pressure thermal plasma. Composition of products (1) BF3 (2) BF (3) B (4) F x 0.1 (5) BF2.

Cuelleron, G., Crusiat, B. (1974), High Purity Boron Production by Hydrogen Reduction of Boron in Inductive Plasma Discharge, in Boron Production, Shaictiwe and Properties, 40i Int. Boron Symposium, Nauka (Science), Moscow. 

Acarkan, N. 2002. Boron products and their uses. In Proceedings of the First International Boron Symposium, ed. K. Erarslan, pp. 1-5. Kiitahya, Turkey Dumlupinar University Press. 

Wang, Z. Sasaki, T. Shimizu, Y. Kirihara, K. Kawaguchi, K. Kimura, K. Koshizaki, N. Effect of substrate position on the morphology of boron products by laser ablation. Appl. Phys. A 2004, 79, 891-893. 

The production of boron products in the year 2000 counted as content of boron trioxide is shown in Table 36.2. 

Borax Na B O lOH O is prepared by water leaching of the mineral tincal and crystallization. By heating of borax in sulfuric acid, boric acid B(OH)3 is obtained. This acid is very weak and is used for its astringent and antiseptic properties. Boric oxide B2O3, prepared by heating boric add, is an important raw material for manufacturing of other boron products. 

Generally, boron fibers are made by means of boron vapor condensing on some carrier materials, such as of tungsten wires, glass, graphite, aluminum, and molybdenum, and the typical fiber diameter with tungsten wires as carrier materials is around 12 pm. Boron fibers are preferable to make some composites. Typical properties of boron products are shown in Table 2.71. 

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