Barium nitrate used for manufacturing kinescopes, and preparation method thereof

Abstract

The invention relates to a barium nitrate used for manufacturing kinescopes, and a preparation method thereof. The method comprises the following steps: (1) dissolving barium nitrate to remove impurities: placing analytically pure nitrate in a glass beaker, adding 1500-2000 ml of distilled water, then adding high-purity sodium hydroxide, performing continuous stirring, standing the obtained solution for 3-4 h, adding analytically pure barium carbonate and analytically pure barium hydroxide, filtering the obtained solution, and adjusting the pH value of the obtained solution to 6.0-6.5 by usinghigh-purity nitric acid to obtain a solution A; and (2) concentrating and crystallizing for obtaining high-purity barium nitrate: concentrating the solution A obtained in step (1), spin-drying the concentrated solution A, and drying the spin-dried solution A to obtain the high-purity barium nitrate. The method adopts the analytically pure barium nitrate as the raw material, and adopts the main steps of barium nitrate dissolving and impurity removal to prepare the high-purity barium nitrate, so the analytically pure barium nitrate is purified into the high-purity barium nitrate, the impuritiesaffecting the use of the barium nitrate are removed, and the obtained barium nitrate well meets the practical requirements of the electronic field.

Description

technical field [0001] The invention belongs to the field of preparation methods of inorganic compounds, in particular to barium nitrate used in the manufacture of picture tubes and a preparation method thereof. Background technique [0002] Existing barium nitrate manufacture method all is by industrial product BaCO , BaS, BaCl... Barium salts such as prepare, and its method has three kinds: 1. nitric acid method: this method is to use industrial product barium nitrate or Barium nitrate is prepared by reacting barium sulfide with nitric acid. The technical process of this method has serious environmental pollution problems. For example, when CO2 and H2S are discharged, a large amount of nitrogen oxides and H2S are mixed, which are highly toxic and extremely harmful to human body and environment. Simultaneously, the raw materials used are expensive, resulting in high production cost of barium nitrate and no market competitiveness, so this method has been eliminated. 2. Nit...

AI Technical Summary

Problems solved by technology

There are serious environmental pollution problems in the technological process of this method. For example, when CO2 and H2S are discharged, a large amount of nitrogen oxides and H2S are mixed in, which are highly toxic and extremely harmful to human body and environment.

At the same time, the raw materials used are expensive, resulting in high production cost of barium nitrate and no market competitiveness, so this method has been eliminated

2. Nitrate method, this method mainly refers to the production method of producing barium nitrate with barium chloride and nitrate. Although this method solves the problem of environmental pollution caused by toxic waste gas, the raw materials used are more expensive and the by-products are recovered. The value is not high, so the production cost is higher, there is no basis for general industrial production, and the industry has been eliminated

The above methods have not jumped out of the method of producing barium nitrate with industrial products (BaCO3, BaCl2, etc.), and the production cost remains high.