Recently, the Ministry of Ecology and Environment, together with the National Development and Reform Commission and the Ministry of Industry and Information Technology, collected and screened a number of advanced cleaner production technologies to compile the National Catalogue of Advanced Cleaner Production Technologies (2022). Among them, in the National Catalogue of Advanced Cleaner Production Technologies (2022) published by the three ministries and commissions, the 16th item is the typical heavy metal sludge mineral phase reconstruction resource disposal technology, which is more energy-saving than traditional disposal methods and can achieve substantial resource recovery.
The resource disposal technology of typical heavy metal sludge mineral phase reconstruction method is based on the principle of fine particle phase mineralization, regulation and separation of heavy metals, using the heavy metal recovery method of "hydrothermal dissociation-directional crystallization-multi-stage separation", and developing the sludge directional mineralization reactor and post-treatment process. Chemical, smelting, electroplating and other sludge crystal transformation detoxification and resource treatment projects have been completed. After treatment, the recovery rate of valuable elements such as chromium and copper is more than 98.4%, and the leaching toxicity of arsenic and other elements is reduced by 99.8%.
Energy-saving effect: the comprehensive power consumption of this technology for treating each ton of heavy metal sludge is 221 kWh, and the comprehensive power consumption of conventional cement kiln for treating each ton of sludge is 1067.4 kWh. The energy consumption per ton of chromium-containing salt sludge is reduced by about 79%.
Details are as follows:
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