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在铝矿石用碱稀释成铝酸钠溶液与赤泥混合物过程中,絮凝剂添加量过高或过低都将影响沉降速度和分离效率,分离的赤泥排放量影响靶机安全运行,因而絮凝剂添加量和底流排放需要控制在合理范围内。本文对深锥沉降槽沉降机理进行分析,基于深锥沉降槽物料平衡关系,考虑到絮凝剂、底流密度、泥位等对沉降速度的影响,建立了絮凝剂添加和底流控制模型。依据絮凝剂质量与进料料浆中固体质量成比例的关系,设计了絮凝剂开环控制结构;依据分离沉降槽控制工艺,分离沉降槽底流排放采用双闭环底流控制结构,内环底流密度控制采用常规PID结构,外环泥层高度控制采用模糊控制器结构;依据洗涤沉降槽洗涤工艺,洗涤沉降槽的底流密度控制采用常规PID结构:研究结果表明,该方法能够提高沉降槽的生产效率,降低系统能耗,保障系统可靠运行,沉降槽絮凝剂添加量和底流排放控制在应用中取得了很好效果。
During the process of diluting the aluminum ore with alkali to form a mixture of sodium aluminate solution and red mud, the excessive or too low flocculating agent will affect the settling velocity and separation efficiency. The separated red mud discharge affects the safe operation of the target and flocculation The dosage of additive and underflow should be controlled within a reasonable range. In this paper, the settlement mechanism of deep cone settling tank is analyzed. Based on the material balance of deep cone settling tank, considering the influence of flocculant, underflow density and mud position on the settling velocity, a flocculant addition and underflow control model is established. According to the relationship between the quality of flocculant and the solid mass in feed slurry, the open-loop control structure of flocculant was designed. According to the control technology of separate settling tank, the bottom-flow discharge of separate settling tank was controlled by double-closed loop underflow control, The conventional PID structure is adopted and the height control of the outer ring mud layer is based on the fuzzy controller. According to the washing settling tank washing process, the underflow density control of the washing settling tank adopts the conventional PID structure. The results show that the method can increase the production efficiency of the settling tank, Reduce system energy consumption and ensure the reliable operation of the system. The amount of flocculant added in the settling tank and the control of underflow emission have achieved good results in application.