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Cleaning method for replacing phosphorization of thermal diffusion electroplating line

An electroplating line and thermal diffusion technology, applied in the electrolysis process, electrolysis components, cells, etc., can solve the problems of deterioration of water quality, high phosphorus concentration in industrial phosphate wastewater, high treatment cost and high cost of regeneration process.

Active Publication Date: 2020-11-24
JIANGSU XINGDA STEEL TYPE CORD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, industrial phosphate wastewater has a high concentration of phosphorus, and both the treatment cost and the regeneration process cost are relatively high, and phosphorus-containing substances are used as a basic nutrient salt. Excessive phosphorus in the water will cause eutrophication and breed a large number of algae and plankton , deteriorating water quality

Method used

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  • Cleaning method for replacing phosphorization of thermal diffusion electroplating line
  • Cleaning method for replacing phosphorization of thermal diffusion electroplating line
  • Cleaning method for replacing phosphorization of thermal diffusion electroplating line

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] The electroplating line is a 42-head production line, and the steel wire specification is Φ1.20mm. Pump part of the solution in the galvanizing tank into the regulating tank, add water to the regulating tank to dilute, and add 50% H 2 SO 4 Formulated to pH 1.0, ZnSO 4 H at a concentration of 130g / L 2 SO 4 / ZnSO 4 Cleaning solution, after the preparation is completed, the solution is pumped into the phosphorus-free cleaning tank of the electroplating line, and the steel wire is immersed in the cleaning solution after being cooled by thermal diffusion water. pH detection was carried out every day during the test period, ZnSO 4 Concentrations were tested every three days. pH adjustment is supplemented with 50% H every 12h 2 SO 4 five kilograms. When ZnSO 4 When the concentration detection is 200-220g / L, open the pipeline switch of the adjustment tank and the cleaning tank as well as the cleaning tank and the galvanizing tank at the same time, drain about 1 / 2 volu...

Embodiment 2

[0021] This embodiment is the same as Embodiment 1, the difference is that when the pH of the cleaning solution is 1.5, ZnSO 4 H at a concentration of 130g / L 2 SO 4 / ZnSO 4 , the steel wire cleaning time is 2s, and the ZnO content on the steel wire surface is 32.3mg / m 2 , to meet the needs of wet drawing.

Embodiment 3

[0023] This embodiment is the same as Embodiment 1, the difference is that when the pH of the cleaning solution is 2.0, the ZnSO 4 H at a concentration of 130g / L 2 SO 4 / ZnSO 4 , the steel wire cleaning time is 2s, and the ZnO content on the steel wire surface is 36.9mg / m 2 , to meet the needs of wet drawing.

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Abstract

The invention discloses a cleaning method for replacing phosphorization of a thermal diffusion electroplating line. A phosphorus-free cleaning solution is adopted to clean steel wires, wherein the phosphorus-free cleaning solution consists of H2SO4, ZnSO4 and pure water, the phosphorus-free cleaning solution is placed in a cleaning tank, an adjusting tank is arranged between a galvanizing tank andthe phosphorus-free cleaning tank, the galvanizing tank is connected with the phosphorus-free cleaning tank through a pipeline, the galvanizing tank is connected with the adjusting tank through a pipeline, and the phosphorus-free cleaning tank is connected with the adjusting groove through a pipeline. When the concentration of ZnSO4 in the cleaning tank is too high, the solution in the cleaning tank directly flows back to the galvanizing tank, and meanwhile, fresh solution in the galvanizing tank is supplemented and added into the cleaning tank through the adjusting tank. The cleaning methodfor replacing phosphorization of the thermal diffusion electroplating line can replace a phosphorus-containing cleaning solution, is low in cost and does not generate pollution.

Description

technical field [0001] The invention relates to a cleaning method for replacing thermal diffusion electroplating line phosphating, and belongs to the technical field of electroplating line cleaning technology. Background technique [0002] In the electroplating process in the steel cord production process, the Zn on the surface of the steel wire will be oxidized to ZnO after being heated by intermediate frequency. Since ZnO is a hard and low-plastic substance, it is not easy to deform in the subsequent production and cause the steel wire to be broken. Therefore, After thermal diffusion, the steel wire needs to be pickled to remove surface oxides. The post-intermediate frequency cleaning process of the thermal diffusion plating line is phosphating, that is, using phosphoric acid to wash away ZnO and other small oxides on the surface of the steel wire. However, the concentration of phosphorus in industrial phosphate wastewater is high, and the cost of treatment and regenerati...

Claims

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Application Information

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IPC IPC(8): C23G1/08C23G1/36C25D5/48C25D7/06C25D3/22C25D21/20C25D5/10
CPCC23G1/081C23G1/36C25D5/48C25D7/0607C25D3/22C25D21/20C25D5/10Y02P10/20
Inventor 刘祥姚利丽李呐冯国兵苗为钢华欣魏于博封恒
Owner JIANGSU XINGDA STEEL TYPE CORD