Sewage treatment process for high-turbidity hematite mineral processing

Abstract

The invention relates to a sewage treatment process for high-turbidity hematite mineral separation. The sewage treatment process is characterized by comprising the following steps of: concentrating all the sewage with the suspended matter concentration of 20,000 to 30,000 mg / L into a sewage regulating pond; conveying the sewage in the sewage regulating pond to a presedimentation tank by using a water transfer pump; adding a water purifying agent before the sewage enters the presedimentation tank; flocculating the sewage by using a high-efficiency presedimentation device, pelleting, performingcentrifugal separation and gravitationally separating so as to control the suspended matter concentration of the water to be 2,500 to 3,500 mg / L; adding a coagulant aid and then adding an anion collecting agent into the effluent of the presedimentation tank; conveying the effluent to a mechanically accelerated clarification pond; and mixing, reacting, settling and separating to obtain the purified water serving as recycled water for a mineral separation process, wherein the suspended matter concentration of the purified water is controlled to be 20 to 100 mg / L. By the sewage treatment process, cost of purifying water is saved; purification index qualified ratio is increased; and requirements of the recycled water for the mineral separation process are met better.

Description

technical field [0001] The invention belongs to the technical field of beneficiation sewage treatment, in particular to a high turbidity hematite ore beneficiation sewage treatment process. Background technique [0002] At present, my country's hematite beneficiation is represented by the heavy and magnetic-anion reverse flotation combined process. This process is concentrated by thickeners before strong magnetism, flotation, concentrate filtration, and tailings discharge. Each thickener The mixed overflow water is collectively referred to as flotation sewage, also known as medium ore water or raw water, which accounts for more than 85% of the total sewage volume of the dressing plant. At present, it is treated by flocculation purification method, and the purified water is returned to the separation process for recycling. [0003] The main problems of this water treatment technology: First, the quality of purified water is greatly affected by the quality and quantity of raw w...

AI Technical Summary

Problems solved by technology

[0003] The main problems of this water treatment technology: First, the quality of purified water is greatly affected by the quality and quantity of raw water, mainly due to fluctuations in the nature of the raw ore, resulting in fluctuations in the quality of raw water, and the concentration of suspended solids fluctuates in a large range, sometimes as high as 20000-30000mg / L, the return of purified water to the production process affects the stability of operations and production indicators; second, water purifiers need to be added in the flocculation purification process, which inevitably brings secondary chemical pollution, leaving some water purifiers (organic) in the purified water or inorganic) ions, the purified water with unqualified purification indicators or the purified water with residual water purifiers returned to the production process for recycling will have a cumulative effect and cause a vicious circle, which will greatly affect the stability of operations and production indicators. Especially for some operations that require high water quality, such as flotation operations, it will affect the flotation index

Images