| According to statistics, China's annual emissions is about 40 percent of the industrial solid tailings waste. Except for the very small proportion of the tailings is to be used, the vast majority of surface tailings is stored in the database. At present in China it has formed a certain scale tailings of about 1500, and non-ferrous and metallurgical industry account for 80 percent. And most enterprises are still using the traditional method of low concentrations emissions, Which has a large investment in infrastructure, high operating costs, difficulty backwater, environmental pollution, poor security and other issues. And it exacerbated the growing tension of the issue of land resources. This discharge methods, in the policy and economic and security, no longer meet the needs of the future mine development. Therefore, searching for metal mine tailings'discharge and disposal's new ways need to be solved. This paper is mainly to the problem and propose a high concentration of metal mine tailings discharge.Compared with the traditional way of low concentrations emissions, the high concentrations of metal mine tailings emissions has small floor coverage, low infrastructure (operating) costs, high security and so on. In the pipeline there are also essentially different from the traditional way of low concentrations slurry pipeline which are two-phase body areas, while high concentration of structural fluid is piped. This article take Jinling Irion Ore high concentration of full-tailing pipeline as the research background. Useing fluid mechanics and rheology theory would be more systematic and comprehensive to expound the key technology of the metal mines high concentration of pipeline. Its contents are as follows:1. By the determination of physical and chemical properties of unclassified tailing in Jinling Iron, and testing different concentrations of the rheological properties, determine the tailings slurry transform a two-phase fluid into the fluid structure of critical weight concentration. The results show that:The critical concentration of the Jinling Iron slurry was 68%, and the weight concentration range from 68% to 74%, between which the tailing slurry fluid is non-Newtonian Bingham fluid and it can transport in the pipeline.2. Based on fluid mechanics and rheology theory, theoretical analysis the impact factor of the loss of slurry pipeline transportation resistance and combined with results to get the main factors of slurry pipeline transportation resistance losses. It includes:the very nature of the slurry, the grain size composition of the slurry, stock trough v. diameter D and the transportation concentration Cw and other key elements. Computer program built by functional relationship between high concentration of slurry and rheological parameters in Jinling Iron. Its mathematical expression is: t0=4E-04e0.1584Cwη=0.62Cw-41.373. Design a high concentration testing of tailings slurry rheological parameters independently -- L-type mensurating experiment rheological parameters, and measure rheological parameters by experiment high concentration and unclassified tailing slurry of Jinling Iron in different concentrations. The experimental results show that:The principle of the method is correct, appropriate and reliable. Compared with the loop test, it has a short time-consuming, low cost, a simple method and easy to operate and so on.4. Useing computer programming language C++build a experimental data processing software, which has regression test data, fitting the results of correlation tests, graphics rendering, and general data table links, computing editor of the experimental data, storage and other functions.5. After a derivation of relevantive theoretical analysis, establishing a pipeline pressure drop calculation model of high concentration of Jinling Iron tailings slurry, and establishing the mathematical relationship between concentration and slurry rheological parameters. So as to Jinling Iron high concentrations of the whole tailings pipeline empirical formula for calculating resistance loss. jm=(16/3D)×4E-04·e0.1584Cw+(0.62·C-41.37)×32v/D2... |
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