Electrochemically-supported chloride ion capturing method and device

Abstract

The invention relates to an electrochemically-supported chloride ion capturing method and device. Calcium-aluminum alloy is used as an anode, one of stainless steel, graphite or titanium is used as a cathode, and chlorine-containing wastewater is electrified in a constant current manner, so that the chloride ions in the chlorine-containing wastewater are captured. Compared with the prior art, the current density and the electrolysis time can be accurately controlled, so that the purposes of reducing energy consumption and raw materials are achieved, meanwhile, the requirement for equipment is low, the process is simple, operation is easy, reaction conditions are carried out at normal temperature, energy is saved, and the method is suitable for industrial production; and chloride ions are fixed in a solid composed of calcium and aluminum, transfer and transportation are convenient, the safety coefficient is high, and chlorine can be concentrated, recycled and reused through a high-temperature decomposition roasting mode.

Description

Technical field [0001] The present invention relates to the field of treatment and purification of industrial wastewater, in particular, to an electrochemical supported chloride capture method. Background technique [0002] Chloride ions are an important element of human and animal life activities, existence in nature. However, excessive chloride ions in the environment will have a lot of harm to humans, animals and plants, and ecological environments. Excessive chloride ion is seriously harming the water environment, destroying water balance, affecting water quality, affects fisheries production, agricultural irrigation, freshwater resources, and even pollutes groundwater and drinking water sources when severe. The hazard of chloride ions is also reflected in the corrosion of stainless steel, and the presence of chloride ions can dissolve the oxide film of the stainless steel surface. In recent years, with the continuous development of the industry, the emissions of chlorine-con...

AI Technical Summary

Problems solved by technology

Chemical precipitation is to use the principle that chlorides are insoluble in water to add a precipitant to the water to separate chloride ions from the water. This method often consumes a large amount of chemicals, the utilization rate of the chemicals is low and it is easy to generate a large amount of solid waste. The advantage is that the operation is simple , The collection and treatment of solid waste is relatively difficult; the traditional electrolysis method removes chlorine ions through electrolysis, so that the chlorine ions lose electrons in the anode area and then leave the system in the form of chlorine gas. The chlorine gas produced by this method can theoretically be reused, but The danger of the gas determines that the collection, storage and use of chlorine gas requires more financial, material and manpower, otherwise new pollution will be formed. At the same time, the electrolysis of low-concentration chlorine ions will consume more electricity, and the economy is not high.