【摘要】：屈服應(yīng)力是高濃度非牛頓膏體的關(guān)鍵流變參數(shù),是膏體充填輸送系統(tǒng)設(shè)計(jì)的基礎(chǔ)。工程應(yīng)用中采用塌落度這一經(jīng)驗(yàn)參數(shù)評(píng)判其流動(dòng)性,卻無(wú)法獲取準(zhǔn)確的屈服應(yīng)力參數(shù)值。通過(guò)構(gòu)建圓柱和圓錐2種理論模型并利用模型與流變儀的測(cè)試結(jié)果對(duì)比,明確塌落度與屈服應(yīng)力的反比例關(guān)系;通過(guò)模型計(jì)算屈服應(yīng)力,在較低屈服應(yīng)力,圓柱比圓錐模型計(jì)算結(jié)果準(zhǔn)確。尾砂膏體塌落度試驗(yàn)表明增大塌落筒的尺寸可以提高模型計(jì)算結(jié)果的準(zhǔn)確性。添加膠結(jié)劑的塌落度試驗(yàn),因膠結(jié)劑的物理化學(xué)作用,顆粒間產(chǎn)生絮網(wǎng)結(jié)構(gòu)形成懸濁液,料漿更加均質(zhì),卻增加了料漿的內(nèi)摩擦力,屈服應(yīng)力升高。不同粗砂比的塌落度試驗(yàn)顯示:因添加的粗顆粒降低了物料整體的比表面積,物料吸附水的能力下降,使大量水分子由吸附態(tài)轉(zhuǎn)變?yōu)橛坞x態(tài),增強(qiáng)料漿的可流動(dòng)性使料漿屈服應(yīng)力顯著降低。
[Abstract]:Yield stress is the key rheological parameter of high concentration non-Newtonian paste and the basis of the design of paste filling and conveying system. In engineering application, the empirical parameter of collapse degree is used to judge its fluidity, but the accurate yield stress parameter can not be obtained. By constructing two kinds of theoretical models of cylinder and cone and comparing the measured results of the model and rheometer, the inverse relation between collapse degree and yield stress is determined, the yield stress is calculated by the model, and the yield stress is lower. The cylinder is more accurate than the cone model. The results of tailings paste collapse test show that the accuracy of model calculation can be improved by increasing the size of caving tube. Because of the physical and chemical action of the binder, the suspending liquid was formed by the flocculation net structure between the particles, the slurry was more homogeneous, but the internal friction of the slurry was increased and the yield stress was increased because of the physical and chemical action of the binder. The results of collapse tests of different coarse sand ratios show that the addition of coarse particles reduces the specific surface area of the whole material, and the ability of absorbing water decreases, which makes a large number of water molecules change from adsorption state to free state. The fluidity of the enhanced slurry significantly reduces the yield stress of the slurry.
【作者單位】： 東北大學(xué)資源與土木工程學(xué)院;深部金屬礦山安全開(kāi)采教育部重點(diǎn)實(shí)驗(yàn)室;沈陽(yáng)有色冶金設(shè)計(jì)研究院;麥吉爾大學(xué)采礦與材料工程系;
【基金】：國(guó)家重點(diǎn)研發(fā)計(jì)劃項(xiàng)目(編號(hào):2016YFC0801605)
【分類(lèi)號(hào)】：TD853.3

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