Nitric acid blow-whitening device and method

Abstract

The invention discloses a nitric acid bleaching device and a method thereof. A mixing and distributing tank is arranged at the upper part of the reaction kettle, a plurality of distribution pipes are uniformly arranged at the lower end of the mixing and distributing tank, and a plurality of vertical whitening cylinders are arranged at the lower part of the reaction kettle , the upper end of the white blowing tube is open, and the white blowing tube is located directly below the distribution pipe. There is a vertical exhaust pipe inside the white blowing tube, and multiple exhaust holes are evenly arranged on the surrounding wall of the vertical exhaust pipe. There are feed pipes, water inlet pipes, vacuum pipes and air inlet pipes. The feed pipes, water inlet pipes and vacuum pipes are arranged directly above the mixing distribution tank. The air inlet pipes pass downward through the bottom of the mixing distribution tank and extend to the bottom of the reactor. The vertical exhaust pipe is connected through a pipe, the bottom of the white blowing tube is provided with a liquid outlet pipe, the center of the bottom of the reaction kettle is provided with a liquid discharge pipe, and the bottom of the reaction kettle is provided with a foot. The invention has the advantages of simple structure, convenient use, good mixing and distribution effect, long contact time between air and nitric acid, and strong whitening ability.

Description

technical field [0001] The invention relates to the technical field of nitric acid production, and more particularly, to a nitric acid whitening device and a method thereof. Background technique [0002] In recent years, with the rapid development of the electronics industry, the chip manufacturing industry is also developing rapidly, and the oxide film of the chip is getting thinner and thinner. When manufacturing chips, they need to be cleaned and corroded with nitric acid, and the purity of nitric acid plays a key role in the yield of chips. That is, the higher the nitric acid purity, the higher the chip yield. Therefore, people are very eager to obtain high-purity nitric acid. [0003] In industry, relatively pure nitric acid is sometimes required, especially with less nitrogen dioxide, otherwise side reactions and by-products will increase. In the nitric acid industry, in principle, it will undergo bleaching treatment, that is, use clean air to blow off the nitrogen ...

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Problems solved by technology

[0006] The object of the present invention is to provide a nitric acid bleaching device and method thereof, aiming to solve the problems in the prior art that the contact effect between nitric acid and air is not good, resulting in poor bleaching effect and affecting the quality of nitric acid production

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