Green A, Levenson G I
Radiography. 1981 Oct;47(562):225-34.
Existing methods of silver recovery need more attention than can be devoted to them by the staff of radiographic departments if they are to be operated at full efficiency. A study of the problems involved has led to the design of an electrolytic cell having a stainless steel anode and an expendable, carbon-fibre cathode. The fixing bath is recycled through the cell which maintains a low concentration of silver, thus cutting down the volume of replenisher required and the loss of silver to effluent, and improving the washing. The fixer can be run indefinitely without replacement, the tendency to discolour through the oxidation of developing agents being controlled partly by the use of the metal anode and partly by an absorptive resin. The operation of the system is controlled by a microprocessor that recognises the formats of the sheets of film being fed to the processor, maintains an inventory of the films used, and silver recovered, and adjusts the time of electrolysis as required. The microprocessor speaks to the operator, acknowledging the input of work, and will advise of any malfunction, or of the need to replace the cathode when fully loaded. The stored information is available to the holder of a key.
如果要使现有的银回收方法充分发挥效率，就需要比放射科工作人员所能投入的更多关注。对相关问题的研究促使设计出一种电解槽，其阳极采用不锈钢，阴极使用可消耗的碳纤维。定影液在电解槽中循环，从而保持银的低浓度，这样既能减少所需补充剂的用量，又能减少银排放到废水中的损失，还能改善水洗效果。定影剂可以无限期运行而无需更换，显影剂氧化导致变色的趋势部分通过使用金属阳极、部分通过吸收性树脂来控制。该系统的运行由微处理器控制，微处理器可识别送入冲洗机的胶片规格，记录所使用胶片和回收银的库存情况，并根据需要调整电解时间。微处理器会与操作员交流，确认工作输入，并会告知任何故障情况，或在阴极满载时提示需要更换。存储的信息可供持有钥匙者获取。
