为研究铝土矿尾矿泥浆沉降的影响因素与影响机制，以平果铝土矿矿泥为例，在不同温度（15、30、45、60 ℃）和不同pH的环境下进行自由沉降试验，对矿泥沉降过程中上清液的高度及不同时刻的沉降速度进行分析，结果表明：15 ~ 60 ℃的温度范围内，浓度7%的矿泥温度每提升10 ℃可使匀速沉降阶段的沉降速度提高0.385 mm/min，10%矿泥温度每提升10 ℃可使匀速沉降阶段的沉降速度提高0.132 mm/min；pH对矿泥沉降速度和沉降时间均有影响，在pH为4.7 ~ 8范围，pH低于7.6时，随着pH的升高沉降速度不断提高，pH为7.1 ~ 7.6时沉降速率较快，最快为7.27 mm/min，pH高于7.6时，沉降速度有降低的趋势。研究成果为改进矿泥浆的沉淀工艺提供了试验与理论依据，为其他矿泥浆的沉降研究提供了借鉴。

In order to study the influencing factors and mechanism of the sedimentation of bauxite tailings slurry, the free sedimentation experiments of bauxite slurry in Pingguo were explained at different temperatures (15, 30, 45, 60 ℃) and pH. The height of supernatant and the settling velocity at different time during the settling process of slime were analyzed. The results show that in the temperature range from 15 ℃ to 60 ℃, the sedimentation velocity in the uniform sedimentation stage is increased by 0.385 mm/min when the temperature of 7% sludge is increased by 10 ℃, and 0.132 mm/min when the temperature of 10% sludge is increased by 10 ℃. The sedimentation velocity in the uniform sedimentation stage is increased by 0.132 mm/min when the temperature of 7% sludge is increased by 10 ℃. The settling velocity and settling time of slime are affected by pH. In the range of pH from 4.7 to 8, the settling velocity increases with the pH when pH value is lower than 7.6. The settling velocity is faster when pH is 7.1 ~ 7.6, and the fastest is 7.27 mm/min. When pH is higher than 7.6, the settling velocity tends to decrease. The research results provide experimental and theoretical basis for improving the sedimentation technology, as well as the reference for the sedimentation research of other ore slurry.