Method for recovering water soluble manganese and magnesium from electrolytic manganese residue

Abstract

The invention discloses a method for recovering water soluble manganese and magnesium from electrolytic manganese residue. The method comprises the following steps: firstly, soluble salt in the electrolytic manganese residue is dissolved with water; secondly, by utilizing the manganese combining capability of chelating resin , which is far stronger than the magnesium combining capability of the chelating resin, a liquid is allowed to flow through a chelating resin column, manganese is absorbed and then flows out along with an outgoing liquid; and after absorbing the manganese, a resin-used sulfuric acid liquid is eluted to recover, thus the manganese is changed into a manganous sulfate liquid and enters into the liquid preparation procedures for an electrolytic manganese production system, and also can be used to prepare manganese salt. Liquid ammonia and ammonium carbonate are added into the outgoing liquid absorbing the manganese to enable the magnesium to deposit; alkali magnesium carbonate is obtained via filtering, washing and drying; and the deposited and filtered liquid is an ammonium sulfate liquid, which can be used to produce chemical fertilizers and electrolyte manganese production, and solves the problems that the electrolyte manganese residue contains a large amount of soluble manganese salt and magnesium salt and can enter into a soil environment, an underground water environment and a surface water to cause resource waste and environmental pollution.

Description

technical field [0001] The invention belongs to the technical field of water-soluble manganese and magnesium recovery, in particular to a method for recovering water-soluble manganese and magnesium from electrolytic manganese slag. Background technique [0002] Electrolytic manganese slag is the waste slag produced during the production of electrolytic manganese metal. Each ton of product produces 5-7 tons of waste slag. Limited by the production process, electrolytic manganese slag contains a large amount of manganese sulfate and magnesium sulfate. Each ton of newly produced electrolytic manganese slag , containing 30-40kg of manganese sulfate and 50-70kg of magnesium sulfate. At present, the production capacity of electrolytic manganese in my country is about 3 million tons, the annual output is about 2 million tons, and the annual output of waste residue is more than 10 million tons. At the same time, because the treatment of electrolytic manganese slag is directly stacke...

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Problems solved by technology

[0004] The invention provides a method for recovering water-soluble manganese and magnesium from electrolytic manganese slag, aiming to solve the problem of recovering manganese from electrolytic manganese slag. There are biological leaching method, chemical reagent leaching method and high temperature roasting and then leaching method, these The method not only has high cost, complicated process and can only recover manganese, but it is difficult to popularize and apply. There are also water leaching and ammonium bicarbonate precipitation methods to recover water-soluble manganese. This method can only recover manganese element alone, and magnesium will also be partially precipitated during precipitation. Down into the manganese carbonate, the use of the obtained manganese carbonate is limited, and the prior art has not yet realized the problem of simultaneous recovery of manganese and magnesium from electrolytic manganese slag

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