Forced circulation pickling method of copper and copper alloy tubes, rods and wires

Abstract

The invention discloses a forced circulation pickling method process of copper and copper alloy tubes, rods and wires, comprising the following steps: preparing pickling liquor in an acid preparation tank, stirring the pickling liquor in a mechanical or circular flow manner and sending the pickling liquor to a circulation tank after stirring; firstly heating the pickling liquor in the circulation tank by a heat exchanger and then circulating the pickling liquor under the action of a circulation pump, and transferring the pickling liquor to a pickling tank after the temperature uniformity meets the use requirement of the process; and forming turbulent flow by forcing the pickling liquor to flow circularly between the circulation tank and the pickling tank to realize relative movement of the pickling liquor and the copper products so as to ensure the pickling liquor to be fully contacted with the surfaces of the copper products to the greatest extent and achieve the effects of uniform pickling and acceleration of pickling, wherein the pickling tank is provided with a movable cover to ensure the copper products to under pickling in relatively sealed space. Acid preparation, circulation and pickling are all carried out in the relatively sealed space, thus the acid mist no longer diffuses toward the workshop but is sent to an acid mist purification tower through an air duct to be subjected to neutralization treatment, thereby effectively protecting the environment.

Description

technical field [0001] The invention relates to a copper and copper alloy pickling method, in particular to a forced circulation pickling method for copper and copper alloy pipes, rods and wires. Background technique [0002] In the production process of copper and copper alloy materials, after hot processing (including hot rolling, extrusion, non-protective heat treatment, etc.), it is necessary to use pickling to remove the residual oxide layer on the surface. There are pass-through and non-pass-through pickling methods: for continuous production of copper strips, the pass-through surface continuous cleaning machine can be selected, which has a high degree of automation and production efficiency; while the pipes produced by the "extrusion-rolling" process , rods and wires, due to the discontinuity of production, currently only a simple pickling tank group can be used for pickling in a non-through method. When choosing pickling tank group for pickling, put the pipes, rods ...

AI Technical Summary

Problems solved by technology

Since the upper part of the pickling tank is open and cannot be closed, the acid mist (especially the NOx nitrogen oxides produced when the pickling solution contains nitric acid) is continuously emitted into the workshop due to the volatilization of the acid solution during the acid preparation and pickling process, polluting The air in the workshop affects and damages the health of personnel, and at the same time causes corrosion to production equipment and workshops

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