Method and device for efficiently oxidizing metal

A metal oxidation, high-efficiency technology, applied in the direction of chemical/physical/physicochemical fixed reactors, etc., can solve the problems of NO gas pollution, complexity, control methods and devices, etc., to speed up the reaction, promote renewal, and fast reaction speed Effect

Pending Publication Date: 2021-11-02
ZHEJIANG HAIHONG HLDG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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

Method used

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  • Method and device for efficiently oxidizing metal
  • Method and device for efficiently oxidizing metal
  • Method and device for efficiently oxidizing metal

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] use as figure 1 device shown, the 1.5m 3 30% nitric acid and 1000kg metallic silver particles are added to 2m 3 In the reactor, in order to improve the utilization rate of nitric acid, about 10% of metallic silver particles is excessive, and the oxygen of 0.5MPa is passed into the reactor top and then closed, and the rotating speed of the hollow stirring shaft 1 is set at 700rpm. The steam in the jacket was heated to 90° C., and after 6 hours of reaction, 1.42 tons of silver nitrate was separated and the utilization rate of nitric acid was 99%.

Embodiment 2

[0039] Referring to Example 1, 355 kg of metal indium particles were used instead of metal silver, and other conditions remained unchanged. After the reaction, 0.839 tons of indium nitrate was obtained, and the utilization rate of nitric acid was 99.3%.

Embodiment 3

[0041] With reference to Example 1, 295kg of metallic copper particles were used instead of metallic silver, and other conditions remained unchanged. After the reaction, 781kg of copper nitrate was obtained, and the utilization rate of nitric acid was 98.8%.

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PUM

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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....

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J19/18
CPCB01J19/18
Inventor 陈海贤曹佳培
Owner ZHEJIANG HAIHONG HLDG
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