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methods for the regeneration of waste pickling solution based on hydrochloric acid
methods for the regeneration of waste pickling solution based on hydrochloric acid
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机译:盐酸的酸洗废液再生方法
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摘要
Regeneration of spent hydrochloric acid after use for pickling iron, which therefore contains iron chlorides, by electrolysis in the cathodic and intermediate compartments of an electrodialysis cell. The installation includes electric circuitry for connecting up the anode as well as input conduits for the spent acid but otherwise consists essentially of an electrodialysis cell with an uneven number of compartments wherein each cathodic compartment is separated from the adjacent intermediate compartment by an anion-selective membrane while a cation-selective membrane separates each intermediate compartment from the anodic compartment, the latter being filled with an anolyte whose total Faraday yield for water oxidation is close to 1. Electrolysis is conducted with current densities at the cathode of 0.1 - 20 A/dm2, at the anode corresponding to the water oxidation reaction and at the membranes such that their perm-selectivity is close to 1. The ionic strengths in equivalents of the regenerated solution and of the untreated spent acid are the same.
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机译:通过在电渗析池的阴极室和中间室中进行电解,在用于酸洗含铁的酸洗后再生废盐酸。该设备包括用于连接阳极的电路以及用于废酸的输入导管,但主要由电渗析池组成,该渗析池的隔室数量不均匀,其中每个阴极隔室都通过阴离子选择膜与相邻的中间隔室分隔开阳离子选择性膜将每个中间隔室与阳极隔室分隔开,后者填充有阳极电解液,其法拉第水氧化总产率接近1。电解在阴极上以0.1-20 A / dm2的电流密度进行在相应于水氧化反应的阳极和膜处,其渗透选择性接近1。再生溶液和未处理废酸的当量离子强度相同。
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