Method for analyzing COD of high-chlorine-concentration alkaline uranium solution
An analysis method and solution technology, applied in the direction of chemical analysis by titration, can solve the problems of large deviation, weak oxidation ability of potassium permanganate and potassium dichromate, and low measurement results.
Active Publication Date: 2020-04-21
BEIJING RESEARCH INSTITUTE OF CHEMICAL ENGINEERING AND METALLURGY
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Problems solved by technology
Commonly used water sample COD analysis methods have requirements on the upper limit of chlorine concentration, such as GB / T 5750.7-2006 Labeling and inspection methods for drinking water - comprehensive index of organic matter: oxygen consumption in acidic potassium permanganate titration method for water sample chloride concentration It is required to be less than 300mg / L, and the chlorine concentration of the water sample can be increased to 1000mg / L by the alkaline potassium permanganate titration method. The deviation of the result is too large
It shows that the oxidation ability of potassium permanganate and potassium dichromate is not strong under alkaline conditions, and the measurement results are seriously low
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[0037] The present invention will be further described below in conjunction with specific embodiment:
[0038] 1. Full oxidation: The amount of potassium permanganate added to the water sample must be excessive, otherwise the oxidation capacity is insufficient and the measured value is low;
[0039] 2. Heating and constant temperature to promote oxidation: the measured water sample must be kept at a constant temperature for 30 minutes in a boiling water bath to promote the oxidation rate of potassium permanganate and ensure that the reducing substances in the water sample are fully oxidized;
[0040] 3. The acidity of the measurement system is sufficient and stable: the acidity of the water sample, whether it is an acidic system or an alkaline system, needs to ensure excessive acid and alkali to ensure the oxidation capacity of potassium permanganate. Before and after the measurement, the acidity of the solution should not change significantly, otherwise it will also affect th...
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Abstract
The invention, which belongs to the technical field of hydrometallurgy uranium mining, particularly relates to a method for analyzing COD of a high-chlorine-concentration alkaline uranium solution. Therefore, the oxygen demand of a uranium-containing water sample in an alkaline or neutral hydrometallurgy uranium mining process can be analyzed in an environment of high-concentration chloride ions and thus a reference is provided for related water pollution treatment. The COD value analyzed by the method is compared with the analysis value of the prepared standard COD solution, and the accuracyis over 99.0%. The method is simple and easy to operate, and is suitable for measuring the oxygen demand of the high-chlorine-concentration alkaline solution in the industrial production field of metal uranium hydrometallurgy recovery.
Description
technical field [0001] The invention belongs to the technical field of uranium mining by hydrometallurgy, and in particular relates to a COD analysis method of a high chlorine concentration alkaline uranium solution. Background technique [0002] Alkaline mining of uranium or CO 2 +O 2 In-situ leaching uranium mining technology is suitable for the mining and recovery of uranium ore with high carbonate content. Compared with acid uranium mining, it has the advantages of high concentration of uranium in the leach solution and low cost. In the process of recovering uranium metal, chlorine-containing reagents (such as sodium chloride solution) are often used as eluents to separate enriched uranium solutions from resins, and hydrochloric acid is often used as acidifying agents or plugging agents in hydrometallurgical uranium mining processes. The above reagents are usually reciprocated and recycled multiple times to save costs and protect the environment, resulting in the conti...
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Login to View More IPC IPC(8): G01N31/16
CPCG01N31/16
Inventor 邓锦勋成弘许影李建华杜志明闻振乾原渊程威
Owner BEIJING RESEARCH INSTITUTE OF CHEMICAL ENGINEERING AND METALLURGY