Composite flocculating agent for processing radioactive elements iron, cobalt, manganese and silver in nuclear waste water and processing method

Abstract

The invention discloses a composite flocculating agent for processing radioactive elements iron, cobalt, manganese and silver in nuclear waste water and a processing method, which belongs to the technical field of the nuclear waste water treatment. The composite flocculating agent consists of a chemical precipitator and an organic polymer flocculating agent, wherein the chemical precipitator is one or combination of more than one of potassium permanganate, sodium sulfide, sodium carbonate and sodium hydroxide; the organic polymer flocculating agent is polyacrylamide, sodium polyacrylate and / or dimethyl diallyl ammonium chloride; and the processing method comprises the following steps of configuring the composite flocculating agent, charging the composite flocculating agent, regulating a pH value of the solution, mixing, flocculating and filtering. Due to the adoption of the composite flocculating agent and the processing method, multiple radioactive element ions of ultralow trace concentration in the nuclear waste water can be efficiently removed, and advantages such as rapidness and high efficiency in reaction process, charging in one step and little dangerous chemical sludge can be realized.

Description

technical field [0001] The invention belongs to the technical field of nuclear power wastewater treatment, and specifically relates to a composite flocculant and a treatment method for treating radioactive elements iron, cobalt, manganese and silver in nuclear power wastewater, and more specifically relates to a method for treating ultra-low Composite flocculant and treatment method for trace amounts of radioactive elements iron, cobalt, manganese and silver ions. Background technique [0002] Processes such as nuclear mining and refining, nuclear fuel manufacturing and nuclear fuel reprocessing, as well as large-scale analytical instruments using radioisotopes, research institutions and hospitals will discharge wastewater containing radioactive elements. The radioactive elements contained in radioactive wastewater usually exist in the form of metal ions and oxide colloids, which have strong carcinogenic and teratogenic effects on organisms in the environment, and must be ef...

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Problems solved by technology

This method not only has long reaction time, large power consumption, large material loss, but also has the disadvantages of large mud production.

[0011] Chinese Patent No. 92115144.6, published on June 15, 1994, discloses a patent document titled Water Purification Method for Highly Efficient Removal of Radioactivity and Heavy Metals, which involves the removal of radioactivity and heavy metals, and removal of groundwater and tailings water. When radioactive ions and iron and manganese ions are used, choose activated carbon or activated coal as the matrix, and use 2% to 10% H 2 SO 4 (or HCl) for acidification treatment, and then use 2% ~ 10% KMnO 4 Perform oxidation treatment to form a manganese dioxide film on the surface of activated carbon or activated coal to effectively remove radium (Ra), thorium (Th), uranium (U), iron (Fe), and manganese (Mn). The activated carbon used in this patent Or after the activated coal reaches saturation and failure, it needs to be continuously regenerated with hydrochloric acid, etc. or directly disposed of as radioactive waste, causing serious secondary pollution.

However, this patent only relies on the nanofiltration membrane element for membrane separation to remove solute particles with large diameters. The anion-yang particle exchange resin and membrane components that adsorb radioactive elements will become radioactive waste together, and the operating cost and secondary pollution are relatively large.

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