System for treatment of acid mine drainage and resource recovery of iron, aluminum, copper and zinc in drainage

Abstract

The invention belongs to the field of wastewater treatment and specially, relates to a system for treatment of acid mine drainage and resource recovery of iron, aluminum, copper and zinc in drainage. The system is characterized in that the system is composed of an iron removal system, an aluminum removal system, a copper removal system, a zinc removal system, a sedimentation basin 1 and a sedimentation basin 2 by sequential connection. Based on differences of precipitation performances of a metal ion under pH conditions and differences of solubility products (Ksp) of a reaction between copperand a sulfur-containing organic chelating agent and a reaction between zinc and the sulfur-containing organic chelating agent, through a fractional precipitation method, iron, aluminum, copper, zinc and the like are separated effectively; resource recovery and utilization is realized; hidden troubles of secondary pollution caused by waste residues are eliminated; and treated drainage reaches a reuse standard and can is fed directly into mineral processing pool for reuse. The system has the advantages of simple process, good effect of drainage treatment, stable operation, low costs of treatment, capital construction investment, energy consumption and operation, and wide application prospect.

Description

technical field [0001] The invention belongs to the field of waste water treatment, in particular to a treatment of acid mine waste water and a resource recovery system for iron, aluminum, copper and zinc in waste water. Background technique [0002] Acid mine drainage (AMD) is a series of physical and chemical reactions such as leaching, oxidation, and hydrolysis of sulfide ore and pyrrhotite under the action of air, water, and microorganisms to form a waste water containing a large amount of heavy metal ions and sulfate radicals. Anionic yellow-brown acidic wastewater. Acid mine wastewater is widespread and has serious environmental impacts in many countries. Acidic mine wastewater will corrode pipes, water pumps, steel rails and other mine equipment and concrete structures after being discharged; it will acidify the water body, consume dissolved oxygen in the water, and cause pollution of rivers, lakes and other water bodies; it will also cause pollution of farmland soil...

AI Technical Summary

Problems solved by technology

However, the amount of slag treated by this method is large, the water content is high, and it is easy to cause secondary pollution. The heavy metal ions in the wastewater are only transferred to the waste slag and have not been removed. They cannot be biodegraded in nature. Accumulate in the environment and cause long-term pollution

For example, Chinese patent: Treatment process of mine sulphur-containing minerals, As, Pb, Cd wastewater (application number: 201010136085.8), discloses a method of neutralization, coagulation, pH control between 8.6-9.5, precipitation removal of heavy metals, so that The effluent reaches the method of "Farmland Irrigation Water Quality Standard", but this process does not effectively separate and recycle the heavy metal ions in the wastewater, which is prone to secondary pollution; another example is the Chinese patent: the method for the separation and recovery of zinc, iron and manganese in acid mine wastewater ( Application No.: 200910044501.9), discloses a method of mechanically activating pyrite adsorption, oxidation precipitation and neutralization precipitation to treat acid mine wastewater, so that zinc, iron and manganese in wastewater can be separated and recovered, but the method uses pyrite Mineral adsorption for zinc removal, sulfide precipitates are small in size, easy to produce colloids, which brings difficulties to separation, sulfide remains in water, excessive sulfur and some heavy metal ions will form complex ions soluble in water and reduce the treatment effect. with HCl, H 2 SO 4 Contact with acid will produce harmful hydrogen sulfide gas, causing air pollution and harm to human body

Images