A kind of atmospheric pressure hydrothermal phase inversion process of bismuth oxide
A bismuth oxide, atmospheric pressure technology, applied in chemical instruments and methods, inorganic chemistry, bismuth compounds, etc., can solve the problems of high consumption of process auxiliary materials, long process production process, high energy consumption of phase inversion, etc., and achieve uniform morphology and cost. Inexpensive, low inversion temperature effect
Inactive Publication Date: 2015-12-09
HUNAN JINWANG BISMUTH
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Problems solved by technology
The chemical method is to dissolve bismuth ingots in excess nitric acid, then convert it into bismuth subnitrate by adding alkali, and then calcine the bismuth subnitrate solution at medium and high temperature to prepare α-bismuth oxide; The environment is not friendly, and the production process is long and the energy consumption is high
The medium-high temperature calcination phase inversion is prepared by arc method to obtain β bismuth oxide, and then the β bismuth oxide is calcined at 550-800°C to obtain α bismuth oxide. The medium-high temperature calcination phase inversion process is environmentally friendly and low in cost, but Phase still has high energy consumption
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[0012] The present invention is described in detail by the following examples. This example is a further illustration of the present invention, and is not a limitation of the protection scope of the present invention. Those skilled in the art can carry out non-essential improvements and adjustments according to the contents of the present invention.
[0013] The β-type bismuth oxide of this embodiment is prepared by the arc method, and the crystal phase XRD of the β-type bismuth oxide before phase inversion is shown in the attached figure 1 . Weigh 30.0g of β bismuth oxide and 1.0g of sodium hydroxide into a beaker filled with 90ml of water, stir for 3 hours at normal temperature and pressure, filter, and dry at 105°C to obtain 29.73g of the product. The weight loss after the reaction is mainly due to material transfer loss; XRD of α-type bismuth oxide crystal phase after phase inversion by hydrothermal method is shown in the appendix figure 2 .
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Abstract
The invention provides a normal-pressure hydrothermal-method phase inversion process of bismuth oxide. According to the process, beta bismuth oxide is directly converted into alpha bismuth oxide in an aqueous phase without medium / high-temperature calcined conversion; the reaction process is that beta bismuth oxide and H2O are converted into alpha bismuth oxide and H2O at the temperature of 100 DEG C. The process is a brand-new process and is energy-saving and environment-friendly; compared with other alpha bismuth oxide preparation processes, the process is simple and practical and is very environment-friendly; the product purity is very high, the content of bismuth oxide can reach 99.9%, and the content of all kinds of impurities is low; and the process is widely applied to the aspects of electronics, articles for daily use, war industry and the like.
Description
technical field [0001] The invention relates to a normal-pressure hydrothermal phase inversion process of bismuth oxide, which belongs to the technical field of crystal preparation. Background technique [0002] Pure bismuth oxide has α-type and β-type. α-type bismuth oxide is a yellow monoclinic crystal with a relative density of 8.9 and a melting point of 825°C. It is soluble in acid but insoluble in water and alkali. β-type bismuth oxide is bright yellow to orange, tetragonal, relative density 8.55, melting point 860°C, soluble in acid, insoluble in water, easily reduced to metallic bismuth by hydrogen, hydrocarbons, etc. Since Hunan Jinwang Bismuth Industry Co., Ltd. took the lead in preparing bismuth oxide through oxygen production and oxidation for industrial production, α-bismuth oxide has a new production process; that is, bismuth oxide prepared by direct oxidation in an electric arc furnace is β-bismuth oxide. The market demand is generally α-bismuth oxide, and th...
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IPC IPC(8): C01G29/00
Inventor 姜凯卢伟红周贱华吴祖祥
Owner HUNAN JINWANG BISMUTH