Abstract
Cemented paste backfill (CPB) can effectively eliminate the risk of dam break in goaf and tailings pond which used tailings waste. Deep cone thickener (DCT) is an efficient machine for the system of paste preparation, and the concentration of slurry at the bottom is high and distributed unevenly, which will cause too much partial resistance and failure of thickener. Focusing on the above problems, fluidization design was conducted by using the fluidization theory. The delivery law of flocs was analyzed, and the isobaric surface was obtained. The equation of pressure and critical velocity of the ideal fluidized bed was acquired by analyzing the relationship between pressure and critical velocity. Based on the characteristics of tailings and distribution of the bonding zone, the arrangement, number, and working mode of spray nozzles were reformed. It is verified that the failure time of thickener decreased from 14 hours to 1 hour and the range of concentration increased from 74%∼78% to 78%∼80%, which improved the stability and reliability of DCT. The depth thickening mechanism is obtained, and the thickening method has been improved which provides a theoretical basis for the effective preparation of paste.
Highlights
At present, mine tailings are often discharged into tailings ponds for its cost efficiency and convenience, where solids and liquids are separated by gravity [1, 2]
Direct disposal into tailings ponds cannot be widely used in the modern era due to its intrinsic drawbacks [3]
cemented paste backfill (CPB) is a complex material composed of multiscale materials produced with dewatered tailings (70–85% solids by weight), hydraulic binders (3–7% by dry paste weight), and water [1, 7,8,9,10]
Summary
Mine tailings are often discharged into tailings ponds for its cost efficiency and convenience, where solids and liquids are separated by gravity [1, 2]. To dispose of mineral tailings in a technical, environmental, and economical way, the cemented paste backfill (CPB) technology is proposed and widely adopted [4,5,6]. Rough gravity and chemical and mechanical action, the deep cone thickener can prepare low-concentration tailings into high-concentration tailings for paste filling. E ordinary thickener and filtration equipment have been widely applied in China with dehydration and thickening technology of unclassified tailings [22, 23], but it cannot satisfy the requirement of high-concentration paste preparation. E nozzles could loosen tailings slurry by some media and liquefy the tailings so that the system could restart after harrow halted [33], which can reduce the processing time and improve operational efficiency In order to improve the homogenization of materials at the cone bottom, based on the fluidized principle, it was proposed that nozzles can be added at the bottom of the harrow [32]. e nozzles could loosen tailings slurry by some media and liquefy the tailings so that the system could restart after harrow halted [33], which can reduce the processing time and improve operational efficiency
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