Noble metal-containing waste water treatment Wastewater Treatment design including metals (design of rare me tals ions- co ntaining waste water treatment) of rare metals including metals and smelter waste water discharged from the other harmful substances are processed, so in line with the content of Emission standards or facility designs that meet recycling requirements. Wastewater Sources and Characteristics Rare metal wastewater is mainly derived from the production of wastewater from rare metal smelters, dust washing water and ground flushing water. Rare varieties, can be divided into light rare metal (lithium, rubidium, cesium and beryllium), rare refractory metal (titanium, zirconium, vanadium, niobium, tantalum, molybdenum, tungsten, rhenium and the like), rare earth metal (scandium, yttrium , lanthanum and actinides), rare metals ( gallium , indium , antimony , bismuth , selenium and tellurium ) and rare radioactive metals ( niobium , uranium and actinides). The waste water contained in different types of rare metal smelters is also different. For example, the vanadium and vanadium smelters mainly discharge waste water containing vanadium and vanadium. Radioactive wastewater with a concentration below 3.7×106 Bq/L is called low level radioactive wastewater, and the concentration is 3.7×106～3.7×1011 Bq/L, which is called medium level radioactive wastewater. The concentration is higher than 3.7×1011 Bq/L. Radioactive wastewater. Radioactive wastewater discharged from rare metal smelters is generally low- and medium-level radioactive wastewater.
Waste water treatment process varies depending on, were selected chemical lime, sodium hydroxide, ferric chloride, ferrous sulfate, aluminum sulfate and the like for processing, for radioactive waste water, even after sand filtration or manganese activated carbon adsorption treatment. The hydrazine-containing wastewater treatment is a highly toxic metal, and the sanitary standard for drinking water sources is 0.2 μg/L. The lime milk is added to the waste water containing strontium. After clarification by precipitation, the strontium removal rate can reach 97%, and the manganese sand can be increased to 99% after filtration. The amount of water remaining in the water drops below 1 μg/L. The slag is stored. Medium and low level radioactive waste water treatment Add ferric chloride to the wastewater. After coagulation and clarification, the removal rate of radon is 97% to 98%. For low-radioactive wastewater containing radium, it is filtered with manganese sand, and the removal rate is about It is 64% to 90%. Activated carbon adsorption is mostly used for final treatment (see the schematic diagram for the process flow of low-level radioactive wastewater treatment). The vanadium-containing wastewater treatment is described in the treatment design of chromium- containing vanadium-containing wastewater.
Low-level radioactive wastewater treatment process schematic diagram The treatment facility generally consists of a wastewater conditioning tank, a chemical preparation room, a pump house, a sedimentation tank, a concentration tank, and a filter press. After the wastewater is adjusted by the regulating tank, it is mixed with the agent, enters the sedimentation tank to clarify the precipitate, and is further filtered or adsorbed as needed. After the sludge is concentrated and filtered, the filter residue is stored in a cavern with anti-seepage measures. During the treatment process, the equipment should be treated with anti-corrosion treatment, and labor safety measures should be considered.
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