A plastic electroplating roughening liquid recovery and circulation method and its application system at the edge of the line tank

Abstract

The invention discloses an online tank edge recovery and circulation method for a plastic electroplating coarsening solution and a using system of the online tank edge recovery and circulation method.The method comprises the following steps that a low-concentration coarsening recovery solution is drained into a multistage decompression evaporator, a high-concentration coarsening recovery solutionand evaporation condensate are extracted, the evaporation condensate is drained into a high-level water storage tank, the high-concentration coarsening recovery solution is pumped into an organic carbon impurity removal aeration system, an organic carbon deslagging agent is added, then aeration is carried out, organic carbon is removed, then filtering and discharging into an electrolytic bath arecarried out, trivalent chromium ions are electrolytically removed, and finally discharging into a concentrated solution storage tank or a coarsening tank is carried out. The using system comprises the multistage decompression evaporator. The multistage decompression evaporator is connected with coarsening solution recovery tanks, the high-level water storage tank and the organic carbon impurity removal aeration system, the organic carbon impurity removal aeration system is connected with the electrolytic bath, and the electrolytic bath is connected with the coarsening tank and the concentrated solution storage tank. According to the online tank edge recovery and circulation method, organic carbon and trivalent chromium in the coarsening solution can be efficiently removed, and the problems of online recovery and recycling of the plastic electroplating coarsening solution can be solved at low cost.

Description

technical field [0001] The invention relates to a plastic electroplating roughening liquid recovery and circulation at the line tank, in particular to a plastic electroplating roughening liquid recovery and circulation method at the line tank and a use system thereof. Background technique [0002] In 2015, with the official implementation of the most stringent environmental protection law in history and the "Regulations on Electroplating Industry Standards", a more severe test was put forward for the electroplating industry. Since rinsing is an indispensable link in the electroplating production process, a large amount of electroplating solution is inevitably brought out during the electroplating process, and a large amount of rinsing wastewater containing low-concentration electroplating solution is produced after rinsing, which not only causes waste of electroplating raw materials, Moreover, it will bring huge economic and environmental pressure to the discharge of wastewa...

AI Technical Summary

Problems solved by technology

In the roughening of plastic electroplating, the loss of the roughening solution (40% sulfuric acid + 40% chromic anhydride) is more serious. Due to its high concentration and high viscosity, the roughening solution brought out is mainly lost during the rinsing process. The post-processing cost is 1-3 times higher than that of chrome plating rinse water, which not only causes a lot of waste of raw materials, but also produces a large amount of solid hazardous waste

The existing plastic electroplating roughening solution treatment method can only be used directly after simple concentration, but there is a problem of accumulation of heterometallic ions and organic matter. When these impurities continue to accumulate and increase with continuous recycling, In the end, it will significantly affect the qualified rate of roughening and electroplating of plastic parts. At present, there are still no particularly perfect methods and equipment to solve the problem of efficient recovery and high-performance recycling of roughening liquid in the roughening process of plastic parts. Therefore, the existing plastic The electroplating roughening solution treatment method cannot remove the trivalent chromium ions and organic carbon present in the roughening solution, the environmental protection and economic effects are not ideal, and the efficient recovery and high-performance recycling of the plastic electroplating roughening solution cannot be realized

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