SU927753A1 - Process for producing strontium or lead molybdenates or titanates - Google Patents

Description

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 The invention relates to the production of molybdates or titanato strontium or lead, which can be used in various fields of technology: ceramic, electronic, electromechanical, laser. .

A known method for the production of metallate metals consists in pressing the powders of the starting components (for example, two metals) and igniting the obtained sample with a tungsten coil in a gaseous medium, for example oxygen 1,

However, when alkaline earth metals are produced by this method of metalates, it is necessary to take a significant excess of alkaline earth metal. In addition, the use of alkaline earth metals in the elementary form is difficult due to their hygroscopicity and the impossibility of obtaining single-phase mass with other metals.

A method of producing titanates of alkaline-earth and non-co-fusible metals is also known by pressing a mixture of titanium, titanium oxide, peroxide and metal oxide and igniting the mixture with a tungsten helix in an oxygen atmosphere 12.

The disadvantage of this method is the need to use

10 pure titanium metal and alkaline earth metal peroxides, which limits the use of the method due to the high cost of raw materials.

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The closest to the invention to the technical essence and the achieved result is a method for producing molybdates alkaline Ov emr

Claims (3)

20 and non-refractory elements, which include pressing a mixture of molybdenum dioxide and an alkaline-earth or non-weak-weak metal peroxide and igniting the resulting mixture with a tungsten helix in an atmosphere of air. The disadvantage of this method is the use of lower valence molybdenum oxide and alkaline-earth or non-refractory metal peroxides. When using molybdenum trioxide and oxides of alkaline-earth or non-low-melting metals, the process does not proceed because of their insufficient activity. The purpose of the invention is to provide the possibility of using as starting products higher oxides of molybdenum or titanium and strontium oxides or tsi or lead. The goal is achieved by the fact that according to the method, prior to mixing, the initial molybdenum trioxide or titanium dioxide is mechanically activated at loads corresponding to acceleration 20100 in the presence of an organic solvent, after which it is mixed with strontium or lead oxides, the mixture is pressed and ignited. In this case, it is advisable to conduct the process with a weight ratio of MoO3 or an organic solvent equal to 1: (). Ketones, aromatic or saturated hydrocarbons and alcohols are used as an organic solvent. With loads corresponding to acceleration less than 20 d, the process is practically not going on. Upper limit naked. Rukski (100 d) is limited to existing grinding devices. PRI me R 1. g of molybdenum trioxide and 20 ml of ethyl alcohol are put into titanium drums with balls of an alloy of tungsten and cobalt and within 10 minutes they activate the material in a planetary mill EI-2-150 with a load corresponding to The accelerated material is dried at 80 ° C and in an amount of 3.6 g is thoroughly mixed with 6 g of lead oxide and a cylindrical tablet (for example, 13 mm in diameter and 10-15 mm high) is pressed from the mixture. The plate is placed. The reactor, equipped with devices for supplying and removing air or inert gas from it, windows for observation during the course of the process 9277 5 to 34 and a tungsten electric coil for ignition, and is set on fire. The burning time of the tablet is about 5 seconds. The resulting product according to x-ray phase analysis corresponds to PbMoOt ,. EXAMPLE 2 Lead molybdate was synthesized according to the method of Example 1. The conditions for the preparation of this metalat differ from Example 1 in that the activation of molybdenum trioxide in a planetary mill is carried out at loads corresponding to the CO, and the burning time of the tablet is about 3 with. The resulting product according to x-ray phase analysis corresponds to PbMoOj. h p and m p 3. The preparation conditions differ from example 1 only in that the activation of molybdenum trioxide is carried out at loads corresponding to 60 d, and the burning time of the tablet is about 3 s. The resulting product according to x-ray phase analysis corresponds to PbMoOt. Example. Under the conditions of Example 1, at a ratio of molybdenum trioxide and strontium oxide to 5.8 and J, 1 g, respectively, is obtained strontium molybdate. Example 5 Lead Titanate Synthesis Is Carried Out. Under the conditions of Example 1, with respect to the mechanically activated titanium dioxide and lead oxide, 2.7 and 8.0 g, respectively, lead titanium is obtained. EXAMPLE 6 Strontium titanate was synthesized. Under the conditions of Example 1, at a ratio of mechanically activated titanium dioxide and strontium oxide, 0 and 5.2 g, respectively, strontium titanate is obtained. Thus, the implementation of the invention allows the use. as starting materials, molybdenum trioxide or titanium dioxide, as well as strontium or lead oxides, which are cheaper and more available compounds than molybdenum dioxide, metallic titanium and strontium or lead peroxide. Claims 1. Method for producing molybdates or. strontium or lead titanates, which include mixing molybdenum or titanium oxides with strontium or lead oxide compounds, pressing 59 the resulting mixture and igniting it, in order to use higher molybdenum or titanium oxides as starting materials and oxides of strontium or lead, before mixing molybdenum trioxide or dioxide oxide (does not undergo mechanical activation under loads corresponding to acceleration of 20-100 d, in the presence of organic dissolve, p. 2. Method of Clause 1, that is, the process is carried out with a weight ratio of MoO s or 3 organic solvent equal to 1: (3-7). 3. The method according to claims 1 and 2, o tl and h ay i and so, the quality of the organic solvent is used ketones, aromatic and saturated hydrocarbons and alcohols.Sources of information taken into account in the examination 1.Pateng France N, grade C O B 35/00, 1970. 2. USSR author's certificate number StSSes, cl. C 01 G 23/00, 197. 3. Authors certificate of the USSR S 567672, cl. C 01 G 39/00, 197 (prototype).