Method and device for efficiently oxidizing metal

Abstract

The invention discloses a method and device for efficiently oxidizing metal. Metal, a nitric acid solution or a mixed solution of nitric acid and hydrochloric acid and oxygen are oxidized in a self-suction type stirring reaction kettle; and the generated nitrogen oxide gas is oxidized into NO2 by the introduced oxygen, the NO2 is sucked into the solution at the lower part under the strong stirring of a self-suction stirrer, is mixed and dispersed with the solution and reacts with water to generate nitric acid again, and the operation is repeated until the nitrogen oxide is completely absorbed by the solution. The integrated self-suction type stirring reaction kettle solves the problem of absorption and utilization of nitric oxide, the consumption of nitric acid raw materials is reduced, no nitric oxide is discharged, no external circulating equipment is arranged, and the oxidation reaction is efficient and simple.

Description

technical field [0001] The invention belongs to the technical field of metal oxidation, and mainly relates to a method and a device for highly efficient metal oxidation. Background technique [0002] Nitric acid has a strong oxidizing property, and can directly oxidize and dissolve metals such as silver, indium, and copper to obtain nitrate. Metals such as tin, antimony, and tungsten can also be oxidized by nitric acid, but the reaction products are hydrates of corresponding oxides, such as insoluble substances such as metastannic acid. After mixing concentrated nitric acid and concentrated hydrochloric acid, inert metals such as gold, platinum, and palladium can also be oxidized and dissolved. In the above oxidation process, nitrous oxide, nitrogen monoxide or nitrogen oxide waste gas of nitrogen dioxide is produced by-product. These nitrogen oxides are serious air pollutants, and the exhaust gas needs to be removed through after-treatment devices, such as lye absorption....

AI Technical Summary

Problems solved by technology

This invention uses an additional external circulation pump and PLC controller to convert NOX tail gas and solution through a special gas-liquid mixing module for gas-liquid mixing and conversion of NOX tail gas, which is relatively complicated.

[0004]Similarly, Patent Publication No. CN204039465U discloses a kind of air flow circulation speed control reaction device of dissolving metal by aqua regia oxygen method, it solves the problem that there is a large amount of NO in the prior art The environmental pollution problem of gas floating with the wind is characterized in that: an air circulation device consisting of an air valve, an air bag, a gas circulation fan, a frequency converter, a fan flow regulating valve, a pipeline and an air flow distributor is added to the reactor; Reaction speed control device composed of liquid kettle, liquid seal tank, alarm and pipeline

This method also requires complex external circulation fans and pipelines for nitrogen oxide recovery and utilization

[0005] In summary, the existing recycling of nitrogen oxide waste gas after the metal nitric acid oxidation reaction requires additional complex external circulation fans, PLC controllers, sensors, etc. Equipment to control, complex control methods and devices

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