Resourceful treatment device and resourceful treatment process for ferric trichloride etching solution

Abstract

The invention provides a resourceful treatment process of a ferric trichloride etching solution. The resourceful treatment process comprises the following steps: (1) firstly evaporating and concentrating, and then cooling and crystallizing; (2) regulating the pH value of crystallization mother liquor by using ammonia water, and respectively controlling iron sinking under the condition of pH valueof 4 to 4.5 and chromium sinking under the condition of pH value of 11 to 12; and (3) recycling ammonia through steam stripping deamination, decomplexing ammonia and nickel in the steam stripping process, and recycling nickel hydroxide precipitates. The invention further provides a resourceful treatment device for the ferric trichloride etching solution. The device comprises an oxidation reactiontank, an evaporative cooling crystallization device, a dissolving tank, a first pH adjusting device, a second filter, a second pH adjusting device, a third filter, a neutralization reaction device, athird pH adjusting device, a steam stripping deamination device, a fourth filter, a raw material storage tank, a water storage tank, a concentrated hydrochloric acid storage tank, an oxidant storage tank, a regenerated etching liquid storage tank, an ammonia water storage tank and a liquid alkali storage tank; iron salt and nickel salt are effectively recycled, evaporative cooling crystallizationand ammonification precipitation are combined, the use amount of liquid caustic soda is reduced, and the production cost of the process is reduced.

Description

technical field [0001] The invention relates to the technology in the field of environmental protection, in particular to a recycling treatment device and process for ferric chloride etching solution. Background technique [0002] Metal etching such as iron and steel is widely used in various fields of national life. The etching technology of various grades of steel, iron, copper, etc. using FeCl3 etching solution is mature. It can be used to manufacture metal letter plates and pattern rollers for printing. More difficult sheet parts are etched, such as metal screens, small holes, gratings, etc., for plaques, graphic engraving on metal surfaces of instruments and equipment, etc. During the etching process, the Fe3+ in the FeCl3 etching solution gradually becomes Fe2+ and loses the etching ability. At the same time, the total iron content increases, and the output of the ferric chloride etching waste solution is large. In addition to being rich in a large amount of Fe, the me...

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Problems solved by technology

[0006] The extraction method (patents CN1470674 and CN101497484) mainly obtains the separation of iron, nickel, etc. through organic solvent extraction, and then back-extracts FeCl3 for reuse. There are problems such as complex process, high cost, and further processing of the extractant, which is not suitable for large-scale industrial applications.

[0007] In recent years, electrochemical methods (patents CN106958021A, CN107059011A, CN206872948U, CN206033893U, CN104131285A, CN104451688A, CN103710706A) have been applied to ferric chloride waste liquid regeneration technology. The Fe2+ in the waste liquid in the cathode area is oxidized to Fe3+ to realize the regeneration and recycling of part of the waste liquid. However, the waste liquid in the cathode area must be re-oxidized by the anode for secondary oxidation due to the reverse oxidation process of Fe3+ being reduced to Fe2+. Utilization, or discarded after subsequent treatment (such as precipitation iron powder replacement or extraction), increases the regeneration cost and solid waste discharge, the overall recycling rate of waste liquid is low, and it is difficult to meet the requirements of production and application

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