Process for separating calcium and magnesium ions from waste water containing manganese

Abstract

The invention provides a process for separating calcium and magnesium ions from waste water containing manganese. The process comprises the following steps: mixing fluoride which is a precipitating agent with waste water containing manganese through a form of dry powder feeding, generating sediment after a full reaction, carrying out press filtration on sediment slurry with a plate and frame filter press, and followed by clear liquid filtering to enters subsequent processing. Processing equipment of the process comprises a precipitating agent bunker, a dry powder feeder, a reaction tank, a sedimentation basin, a clear liquid pool, an ultrafiltration system and the plate and frame filter press, wherein a stirrer is provided with in the reaction tank, and pipelines and pumps are provided between equipment. The advantages of the process in the invention are as follows: the process is suitable for processing waste water containing manganese with various ion concentration, and application range of pH value of the process is wide; the process has a high rate of calcium and magnesium ions removal, and through adjusting addition a removal rate can reach 100%; on condition that a loss rate of manganese ion is less than 0.2%, the process can effectively remove the calcium and magnesium ions from the waste water containing manganese to achieve the purpose of separating calcium magnesium ions. The process is suitable for separating calcium and magnesium from waste water in electrolytic manganese production.

Description

technical field [0001] The invention belongs to the technical field of wastewater treatment, and in particular relates to a process for separating calcium and magnesium ions in wastewater generated from manganese ore tailings. Background technique [0002] In the manganese mining area, a large amount of waste water will be produced by the slag stockpiling plant. The waste water discharge volume is large, the water quality is complex, and contains a large amount of metal ions. If it is discharged directly, it will seriously pollute the environment and cause the loss of manganese resources. Recycling and treating the waste water for electrolytic manganese production can realize the effective utilization of manganese resources. However, this type of wastewater contains a large amount of calcium and magnesium ions, which will affect the efficiency and life of the nanofiltration membrane used in the subsequent process during the treatment process, and will also affect the electro...

AI Technical Summary

Problems solved by technology

In the invention patent with the publication number CN 100552061C, a method for extracting calcium and magnesium from the copper-cobalt ore leaching solution is proposed. The process is complicated and cannot completely remove calcium and magnesium ions.

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