无机和有机絮凝剂复配对铁尾矿沉降特性研究

Study on the Settlement Characteristics of Iron Tailings by Combination of Inorganic and Organic Flocculants

陕西某铁矿选矿厂尾矿难沉降、尾水质量差,尾水长期未回用,不仅浪费水资源,还存在环境污染等问题。为了加快尾矿沉降、改善尾水质量,对尾水进行回用,选用不同种类的无机和有机絮凝剂对尾矿浆进行沉降试验研究,并考察了FeCl3和新型AL9020有机絮凝剂复配对尾矿絮凝沉降的作用。结果表明,该铁尾矿粒度细,自然沉降效率低,单独使用无机絮凝剂时尾矿沉降速度较慢,但澄清层浊度低;单独使用有机絮凝剂时尾矿沉降速度快,但澄清层浊度高;将FeCl3和AL9020絮凝剂配合使用既能提高尾矿的沉降速度,又能降低澄清层的浊度,增强了尾矿的沉降效用。在最佳药剂制度下:先添加200 g/m^3的FeCl3,再加入15 g/m^3的AL9020絮凝剂,铁尾矿的沉降速度为301.68 m/d,澄清层浊度为23NTU,沉降速度的加快和澄清层浊度的降低为尾水回用提供了质量保障。无机和有机絮凝剂复配后产生协同作用,能够显著提高尾矿的沉降效果,为尾矿尤其是细粒尾矿的沉降提供借鉴。

An iron tailing in Shaanxi is difficult to settle,the tail water quality is poor,and the tail water has not been reused for a long time.This not only wastes water resources,but also has environmental pollution problems.In order to accelerate the settlement of tailings and improve the quality of tail water to promote the reuse of tail water,different kinds of inorganic and organic flocculants were selected to study the sedimentation of tailings slurry.The interaction of FeCl3 and new organic flocculant of AL9020 on flocculation sedimentation of tailings was also investigated.The results showed that the fine grain size of the iron tailings makes it difficult to settle naturally.When the inorganic flocculant is used alone,the sedimentation speed of the tailings is slow,but the turbidity of the clarification water is low.And when the organic flocculant is used alone,the sedimentation speed of the tailings is fast,but the turbidity of the clarification water is poor.The combination of FeCl3 and AL9020 flocculants can improve the settling speed of tailings and reduce the turbidity of clarification water,which can enhance the settlement effect of tailings.Under the optimal medicament system with the FeCl3 and AL9020 dosage of 200 g/m^3 and 15 g/m^3 respectively,the settling velocity of iron tailings is 301.68 m per day,and the turbidity of clarification water is 23 NTU.The acceleration of the sedimentation rate and the decrease of the turbidity of the clarification water provide quality assurance for the reuse of tail water.And the combination of inorganic and organic flocculants produces a synergistic effect,which can significantly improve the settlement effect of tailings and provide a reference for the settlement of tailings,especially fine-grained tailings.