Preparation method of indium nitrate solution

Abstract

The application provides a preparation method of indium nitrate solution. The preparation method comprises the following steps: S1, heating and melting indium and performing water quenching, so as toobtain indium flowers; S2, after one or more additives of oxalic acid, nitric acid and nitrate is / are prepared into a solution, adding the solution into a reaction kettle, heating to 60 DEG C, addingthe indium flowers into the reaction kettle, and regulating the temperature of the reaction kettle to be constant; S3, adding concentrated nitric acid into the reaction kettle for reaction, stopping heating after the adding of the concentrated nitric acid is completed, and performing continuous reaction for a period of time, so as to obtain the indium nitrate solution. According to the application, fewer nitrogen oxides are generated in the process of preparing the indium nitrate solution; the preparation process is simple, and the acid consumption is less; moreover, after the generated fewernitrogen oxides are absorbed by water, the nitrogen oxides can be directly discharged into air, so that the treatment cost of tail gas is lowered, and the treatment is more environmentally friendly; additionally, dilute nitric acid solution generated after the nitrogen oxides are absorbed by the water can be recycled in a certain treatment manner.

Description

technical field [0001] The application relates to the field of material preparation, in particular to a method for preparing an indium nitrate solution. Background technique [0002] Nitrate is an important chemical material, which is generally obtained by the reaction of metals and nitric acid. For example, indium nitrate can be obtained by dissolving metal indium with nitric acid. A large amount of nitric acid is wasted, and the treatment of nitrogen oxides in the later stage will also increase the cost, and will also have a certain impact on the environment. [0003] At present, there are two main methods to deal with the emission of nitrogen oxides in the process of nitrate preparation: the first method is to absorb the nitrogen oxides produced in the preparation of nitrate through sodium thiosulfate and sodium hydroxide solution, but this method The cost of treating nitrogen oxides is high, and it will bring secondary waste treatment costs; the second method is to redu...

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Problems solved by technology

[0002] Nitrate is an important chemical material, which is generally obtained by reacting metal with nitric acid. For example, indium nitrate can be obtained by dissolving metal indium in nitric acid, but in A large amount of nitrogen oxide gas will be produced in the process of indium, which will not only waste a large amount of nitric acid, but also increase the cost of the nitrogen oxide treatment in the later stage, and will also have a certain impact on the environment

[0003] At present, there are two main methods to deal with the emission of nitrogen oxides in the process of nitrate preparation: the first method is to absorb the nitrogen oxides produced in the preparation of nitrate through sodium thiosulfate and sodium hydroxide solution, but this method The cost of treating nitrogen oxides is high and will bring secondary waste treatment costs; the second method is to reduce the production of nitrogen oxides during the reaction process in the process of preparing nitrate

The Chinese patent application CN97107236.1 with the application date of December 16, 1997 discloses adding zeolite molecular sieves modified with sodium hydroxide and nitric acid in the process of dissolving metals in nitric acid to prepare nitrates, and introducing oxygen-enriched air or oxygen , control the pressure of the reactor to -0.04MPa ~ 0.11MPa, react at 60°C for 4 hours, the tail gas is absorbed by a water-sealed tank and an absorption tower, so that the emission of nitrogen oxides is greatly reduced, but this method needs to add zeolite molecular sieves Catalyst, the process is more complicated, and the cost is higher

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