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Method of treating stainless steel chemical pigmentation aging liquid

A technology of chemical coloring and treatment method, which is applied in the field of recycling treatment of stainless steel chemical coloring aging liquid, can solve the problem of recycling and reuse of useful components polluted by chemical coloring aging liquid, achieve separation and recovery, simple equipment, and mild conditions Effect

Inactive Publication Date: 2009-06-10
TAIYUAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] The problem to be solved by the present invention is the pollution problem of chemically colored aging liquid, the recovery of useful components and the problem of recycling, and its purpose is to provide a green treatment method for chemically colored aging liquid

Method used

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  • Method of treating stainless steel chemical pigmentation aging liquid
  • Method of treating stainless steel chemical pigmentation aging liquid

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] The first step, evaporation and separation treatment: take 160mL stainless steel chemical coloring aging solution, put it in a 250mL three-necked flask equipped with a stirrer, a thermometer and a condenser. When directly heated to 95°C with an electric heating mantle under stirring, the solution began to boil and then the temperature stabilized at 98°C. After about 40 minutes, the temperature rose slowly to 140°C, and at this time, almost no water droplets flowed out. Stop heating, let stand to cool to room temperature, then cool in an ice bath for 4h~5h, filter with suction, dry the solid at 90°C~100°C for 5h~6h, and obtain 28.7g of reddish-brown particles of chromic anhydride and ferric salt solid mixture, which can be recycled for the preparation of new coloring liquid (at this time, due to the difference in solubility between chromic anhydride and ferric salt, ferric salt can be filtered out). Collect dark green viscous trivalent chromium solution (also containing...

Embodiment 2

[0027]The first step of evaporation and separation treatment: take 160mL of stainless steel colored aging solution and place it in a 250mL three-necked flask equipped with a stirrer, a thermometer and a condenser. Under reduced pressure (vacuum degree about 0.01MPa) and stirring, when the temperature was raised to 60°C with an oil bath, the solution began to boil, and then the temperature stabilized at 72°C. After about 30 minutes, the temperature rose slowly to 107°C, at which point almost no water droplets flowed out. Stop heating, let stand to cool to room temperature, then cool in an ice bath for 4h-5h, filter with suction, dry the solid at 90°C-100°C for 5h-6h, and obtain 27.9g of reddish-brown granules of chromic anhydride and ferric salt The mixture can be recycled for the preparation of new coloring solution (at this time, due to the difference in solubility between chromic anhydride and ferric salt, ferric salt can be filtered out). Collect dark green viscous trivale...

Embodiment 3

[0030] The first step of evaporation and separation treatment is the same as in Example 1.

[0031] The second step of electrolytic oxidation treatment: take 35mL of the trivalent chromium solution after the first step, dilute it three times and make it as the anolyte and place it in the electrolytic oxidation device. The diaphragm, the titanium-based lead dioxide electrode is used as the anode, and the lead plate is used as the cathode, and the circuit is connected. After heating the water bath to 50°C under stirring, turn on the power and control the anode current density to 250A / m 2 , electrolytic oxidation treatment 2.5h, some water should be added appropriately during this period. After the reaction was completed, a dark red anolyte was obtained, and the Cr 6+ Content 26.13g / L, Cr 3+ Content 0.51g / L, Fe 3+ Content 0.09g / L, Ni 2+ The content is 0.19g / L, the conversion rate is 78.64%, and the current efficiency is 96.36%. At this time, the anolyte can also be directly...

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Abstract

The present invention discloses a processing method for non-corrodible steel chemical tinting aging solution. The method comprises the following steps: above all, adopting a evaporation partition method to separate the solid mixture of hexavalent chromium and ferric iron salts, trivalent chromium solution (also containing bivalence nickle and small quantity of ferric iron ion ) and distilled water out of the tinting aging solution, wherein the solid mixture and the distilled water can be cyclic-used for preparing new tinting solution (in which the ferric iron salt has small dissolvability and then can be removed by filtration ); then, adopting an electrolytic oxidation method for directly oxidating the diluent of trivalent chromium solution into hexavalent chromium and separating the bivalence nickle and the residual ferric iron ions by enriching them at cathodes, wherein the anode liquor after oxidation can be used directly for preparing new tinting solution and the catholyte can be cyclic-used for preparing new anode liquor. The present invention realizes circulation utilization of chromium and sulphuric acid as well as separation and reclaiming of nickle and iron, is characterized by its simple operations, mild conditions, simple equipments and zero discharge and the like, perfects entire process of INCO chemical tinting method, and has industrialisation foreground.

Description

technical field [0001] The invention relates to a stainless steel chemical coloring liquid, in particular to a recycling treatment method for the stainless steel chemical coloring aging liquid. Background technique [0002] Because of its unique superior performance, colored stainless steel has great market value and is increasingly favored by people. Among the many preparation methods of colored stainless steel, the acid chemical coloring (INCO) method is the most widely used because of its bright color, good wear resistance and corrosion resistance, and not affected by the shape of the steel piece. However, because the colored aging solution contains high-concentration sulfuric acid and hexavalent chromium that are difficult to handle, the popularization and application of this method is greatly restricted. The treatment methods of the reported chromium-containing waste liquid can be summarized as follows: [0003] (1) Reduction method: due to Cr 3+ The toxicity is rela...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23C22/86B01D1/28B01D9/02C25C1/06C25C7/02
CPCY02P10/20
Inventor 薛永强汤芝平栾春晖崔子祥
Owner TAIYUAN UNIV OF TECH
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