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2000年,方孝玲了解到,白银不仅存在于少量矿石中,还存在于照相馆、医院放射科、彩扩部、印刷厂、电镀厂、电子(电器)厂、制镜厂、保温瓶厂、感光材料厂等单位排放的废水及胶片、X光片、CT片、菲林片、废旧线路板、电子垃圾等废料中。以前这些废水、废料有些被低价卖掉,有些被倒掉,不但损失了大量的白银,还污染了环境。
In 2000, Fang Xiaoling learned that silver is not only found in a small amount of ore, but also exists in photo laboratories, hospital radiology department, color enlarging department, printing factory, electroplating factory, electronics (electrical) factory, mirror factory, thermos bottle factory, photosensitive material Factories and other units of wastewater and film discharge, X-ray film, CT film, film, waste circuit boards, electronic waste and other waste. In the past, some of these wastes and wastes were sold at low prices, while others were discarded, not only losing a large amount of silver but also polluting the environment.