(1. 北京科技大學(xué) 土木與資源工程學(xué)院，北京 100083；
2. 河南理工大學(xué) 土木與環(huán)境工程學(xué)院，焦作 454150；
3. 昆明理工大學(xué) 國土資源工程學(xué)院，昆明 650093)
摘 要: 結(jié)合沉降和壓濾實驗研究濃密機(jī)內(nèi)全壓力范圍下尾砂脫水性能，考察網(wǎng)狀結(jié)構(gòu)形成體積分?jǐn)?shù)、壓縮屈服應(yīng)力、干涉沉降系數(shù)等參數(shù)的變化規(guī)律。結(jié)果表明：網(wǎng)狀結(jié)構(gòu)形成體積分?jǐn)?shù)隨絮凝劑單耗增加先升高后降低，單耗20 g/t時網(wǎng)狀結(jié)構(gòu)形成體積分?jǐn)?shù)達(dá)到最大值；壓縮屈服應(yīng)力隨體積分?jǐn)?shù)變化呈冪和指數(shù)增長，在低壓力區(qū)域，絮凝劑單耗對底流體積分?jǐn)?shù)影響較大，在高壓力區(qū)域，絮凝劑作用逐漸弱化；干涉沉降系數(shù)隨體積分?jǐn)?shù)變化呈冪增長，在低壓力區(qū)域，絮凝劑單耗對料漿滲透性影響較大，單耗80 g/t時滲透性良好，在高壓力區(qū)域，絮凝劑單耗對料漿滲透性影響逐漸弱化。實驗范圍內(nèi)，膏體料漿存在脫水拐點，其體積分?jǐn)?shù)為38%~42%。
關(guān)鍵字: 穩(wěn)態(tài)濃密機(jī)；脫水性能；壓縮屈服應(yīng)力；干涉沉降系數(shù)
（1. School of Civil and Resource Engineering, University of Science and Technology Beijing, Beijing 100083, China;
2. School of Civil and Environment Engineering, Henan Polytechnic University, Jiaozuo 454150, China;
3.Faculty of Land Resources Engineering , Kunming University of Science and Technology, Kunming 650093, China）
Abstract:The dewaterability of tailings was investigated under the condition of all pressure zone in thickener by combining settling and filtration experiments. The dewatering parameters, such as gel point, compressive yield stress and hindered settling function, were statistically calculated. The results indicate that the gel point increases firstly and then decreases with flocculant dosage increasing, the maximum value of gel point is obtained at dosage of 20g/t. The compressive yield stress increases combining power function and exponential function with the concentration. The flocculant dosage has a big effect on concentration at the low pressure zone relatively, and the effect decreases gradually at the high pressure zone. The hindered settling function grows with a power function of concentration. The flocculant dosage has a big effect on concentration at the low pressure zone relatively with obtaining the optimum permeability at the flocculant dosage of 80g/t, and decreases gradually at the high pressure zone. An obvious turning point of volume fraction being from 38% to 42% is observed in the experiments.
Key words: steady state thickener; dewaterability; compressive yield stress; hindered settling function
