Carbon-nitrogen-oxygen combined treatment process and device

Abstract

The invention relates to a carbon-nitrogen-oxygen combined treatment process and device. The process comprises previous cleaning, preheating, nitrocarburizing, oxidizing, waste gas treatment and later cleaning, wherein the waste gas treatment comprises the following steps: 1, introducing poisonous gas in a nitriding furnace into an oxidizing furnace for performing detoxifying treatment; 2, introducing gas in the oxidizing furnace into an absorption tower for performing spraying treatment, and achieving emission on standard. The invention also relates to a carbon-nitrogen-oxygen combined treatment device which comprises a preheating furnace, the nitriding furnace, the oxidizing furnace and a waste gas purification treatment device, wherein the nitriding furnace is communicated with the oxidizing furnace through a first fan and a first pipeline; the oxidizing furnace is communicated with the waste gas purification treatment device through a second fan and a second pipeline; gases in the nitriding furnace enter the oxidizing furnace and are purified through the waste gas purification treatment device for emission. The process and the device have the advantages of high waste gas treatment efficiency, stable process, short aging and high yield, the equipment is simple and practical, and reduction, harmlessness and reclamation in the whole technical process are realized.

Description

technical field [0001] The invention relates to the technical field of surface heat treatment, in particular to a nitrogen, carbon and oxygen composite treatment process and device. Background technique [0002] In order to improve the hardness, wear resistance, corrosion resistance, etc. of metal workpieces, it is usually necessary to change the morphology, chemical composition, tissue structure and stress state of the workpiece surface by coating, surface modification or composite treatment technology on the workpiece surface to obtain Required performance; In the process of mechanical manufacturing, heat treatment methods such as nitriding, carburizing and oxidation are mainly used, but usually only a single heat treatment technology is used for metal workpieces to improve the wear resistance or corrosion resistance of the workpiece, such as nitriding, which It is a chemical heat treatment process that infiltrates nitrogen atoms into the surface of the workpiece in a cert...

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Problems solved by technology

[0002] In order to improve the hardness, wear resistance, corrosion resistance, etc. of metal workpieces, it is usually necessary to change the morphology, chemical composition, tissue structure and stress state of the workpiece surface by coating, surface modification or composite treatment technology on the workpiece surface to obtain Required performance; In the process of mechanical manufacturing, heat treatment methods such as nitriding, carburizing and oxidation are mainly used, but usually only a single heat treatment technology is used for metal workpieces to improve the wear resistance or corrosion resistance of the workpiece, such as nitriding, which It is a chemical heat treatment process that infiltrates nitrogen atoms into the surface of the workpiece in a certain medium at a certain temperature. The common nitriding processes include liquid nitriding, gas nitriding, and ion nitriding. The nitriding of the workpiece is usually carried out in a salt bath. A small amount of nitriding salt remains on the workpiece in the salt bath, and the nitriding salt contains toxic cyanide, so the workpiece after the nitriding salt bath and the slag taken out of the nitriding furnace must be put into the oxidation furnace for detoxification treatment At the same time, it also improves the corrosion resistance of the workpiece surface. In the traditional process, the nitriding furnace and the oxidation furnace are independent of each other. Because ammonia gas, toxic hydrogen cyanide gas and salt are produced during the nitriding or oxidation process For the treatment of waste gas and dust, the traditional method does not separate and pretreat the waste gas and dust, but directly sprays the waste gas through the absorption tower and then discharges it through the high exhaust chimney, part of which Toxic gas has not been fully neutralized and detoxified, polluting the environment, and the dust contains nitrided salts or oxidized salts. The price of nitrided salts and oxidized salts is relatively high, and they are not recycled and reused during the treatment process, resulting in waste of resources And nitrogen salt and oxide salt are easily soluble in water, which will cause secondary pollution to the environment

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