[en] From radioactive equilibrium of natural radioactive decay series and content of several radioactive constituents, the formula for estimating activity of uranium ore and solid waste is derived and a case study on treatment engineering of decommissioning Linchang Uranium Mine is presented

[en] Ion chromatography using pellicular ion exchange resins and dilute solution can be devoted to the study of ion exchange thermodynamics and kinetics. Ion exchange equilibrium equation was obtained, and examined by the experiments. Based on ion exchange equilibrium, the influence of eluant concentration and resin capacity on adjusted retention volumes was examined. The effect of temperature on adjusted retention volumes was investigated and heats of ion exchange of seven anions were determined by ion chromatography. The interaction between anions and skeleton structure of resins were observed

[en] The author reviewed recent development and practical application of solid phase spectrophotometry in analysis of materials and goods of mining-metallurgy. Separation and preconcentration and conditions of coloring determination, sensitivity and range of detection, as well as interference of corresponding method are discussed

[en] The production costs in uranium ming and metallurgy have been analyzed quantitatively term by term according to present production situation for The Uranium Mining and Metallurgy Corp, which is part of Fuzhou Uranium Mine. The principal factors influencing on the production costs and the main means reducing the production costs have been found

[en] The author reviews the developments on the liquid-liquid extraction mechanism of uranium (VI), including the classification of the binary and ternary synergic system of uranium. The principle of synergism, application of orthogonal array in ternary synergic extraction system, application of cone packing model in uranium extraction. Thermodynamics studies of synergistic extraction by titration calorimetry, and formation of reversed micelles and water in oil microemulsions were used to explain the mechanics of extraction

[en] The author evaluates the history and development orientation about mechanized construction of sinking and driving engineering in uranium mine at home and abroad, explains the necessity for setting-up of sinking and driving engineering mechanized construction company, and analyses the application feasibility of raising drilling machine

[en] The application of extraction by supported liquid membranes (SLM) in flow injection analysis (FIA) on-line separation has been investigated. The principle of a SLM process is that the organic phase is adsorbed to a porous hydrophobic membrane separating the two aqueous phases which correspond to the feed and strip solution in the extraction process. It shows that SLM separations can be used in FIA. It can supply another rapid and automatic analysis method for determining uranium (VI). In the FIA system, trace uranium (VI) in samples is determined under a having existed determination conditions after trace uranium (VI) being separated by SLM. A determination range of the method is 10∼100 μg/mL and the relative standard deviation (RSD) is 0.9%, the determination speed is 20 samples/h. The membrane can be used for a month. (over 100 samples)

[en] Some instances have occurred for that road constructions were likely to meet with some high grade uranium mine in some provinces with abundant uranium resource and developed economy. Some of the constructions have made assessment for the radiation risk. The author discusses the problems existent in the assessments

[en] Bad penetrability ore which has high mud content is examined by adding penetrative matter in order to improve ore penetrability. The result shown that the ore penetrative coefficient and uranium leaching rate can be effectively improved within a certain period, the leaching cycle is shorted as well

[en] A method of HAZOP analysis was used to carry out the risk analysis of carbon dioxide and oxygen supply systems for CO_2 + O_2 in situ leaching project in a uranium mine. Through identifying the potential risks which existed in equipment and operating procedures, the possible consequences were analyzed. Aimed at existing problems, corresponding suggestions and measures were put forward. These measures can make the system to be optimized and reduce the possibility of the system fault, thus ensuring the normal operation of the in situ leaching system. (authors)