Nitric acid recycling system

Abstract

The invention relates to the recycling of acidic liquid and particularly relates to a nitric acid recycling system. At present, a waste acid solution passing through nitric acid cleaning and ceramic filtering equipment still has certain acidity and is needed to be neutralized by adding an alkaline solution, and then, the waste liquid is discharged. The process has the defects that the resource is wasted, the cost is increased, the process is complex and not easy to control, and the discharged waste liquid can not be up to the standard frequently and pollutes the environment. The system is composed of a dilute nitric acid recovering, depositing and storing tank, a stainless steel magnetic pump device, a stainless steel delivery and recovery pipeline device, a stainless steel filter device, an automatic concentrated nitric acid liquid replenishing device and an automatic electrical control device; the waste acid solution is mixed with 50% nitric acid output by the automatic concentrated nitric acid liquid replenishing device to be up to the concentration of 3-5% after being deposited and filtered, and then, the waste acid solution is utilized.

Description

technical field [0001] The invention relates to the recovery and reuse of acid liquid, in particular to a nitric acid recovery and reuse system. Background technique [0002] In the production of the enterprise, when a filter equipment has been in operation for a period of time, it must be cleaned with dilute nitric acid before it can be put into use again. After cleaning, the waste acid still has a certain acidity, and needs to be neutralized by adding lye, and the neutralized waste is then discharged. There are following problems in this kind of technique: [0003] 1. The waste acid after cleaning also has a certain acidity and cleaning effect. Failure to recycle not only wastes acid resources, but also increases the cost of lye neutralization; [0004] 2. The lye neutralization process is complicated and difficult to control in place, and the discharged waste liquid often does not meet the standard, polluting the environment. Contents of the invention [0005] The pu...

AI Technical Summary

Problems solved by technology

[0003] 1. The waste acid after cleaning also has a certain acidity and cleaning effect. Failure to recycle not only wastes acid resources, but also increases the cost of lye neutralization;

[0004] 2. The lye neutralization process is complicated and difficult to control in place, and the discharged waste liquid often does not meet the standard, polluting the environment

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