Method for low-temperature deironing by using mixed gas of air and sulfur dioxide (SO2)

Abstract

The invention relates to a process for low-temperature deironing by using mixed gas of air and sulfur dioxide (SO2) for an ore leaching solution in the metallurgy industry. At present, a plurality of deironing methods are available in wet metallurgy, wherein a goethite deironing method has the widest application range in the wet metallurgy, however, oxidant accessories are limited in supply and the production cost is relatively high. The method disclosed by the invention is characterized by comprising the steps: firstly, adjusting the pH value of a solution ahead of deironing by using calciumcarbonate and continuously introducing the air; and then introducing the mixed gas of the air and the SO2 for oxidization, and continuously adjusting the pH value by using the calcium carbonate for neutralization to realize the deironing. According to the method, a derioning effect is guaranteed, the mixed gas of the air and the SO2 is taken as an oxidant, a high-temperature condition is not required and the advantage of low cost is achieved.

Description

technical field [0001] The invention relates to an iron removal process, in particular to a method for removing iron at low temperature by using a mixed gas of air and sulfur dioxide in an ore leaching liquid in the metallurgical industry. Background technique [0002] In hydrometallurgy, acidic solution is usually used to leach ore. The leaching solution contains trivalent or ferrous iron ions, which will cause great harm to iron in the subsequent process and electrodeposition process. Therefore, iron removal is very important in hydrometallurgy. An important process. There are many ways to remove iron from high-iron solution, mainly including jarosite method, goethite method, and hematite method. Air, manganese dioxide, hydrogen peroxide, etc. are usually used as oxidants in the iron removal process. Because the filter residue obtained by goethite iron removal has very good filterability, and the iron slag has large crystals, less metal ions and high iron content, so goet...

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Problems solved by technology

Because the filter residue obtained by goethite iron removal has very good filterability, and the iron slag has large crystals, less metal ions and high iron content, so goethite iron removal is often used in hydrometallurgical processes, but the oxidant Excipient supply is limited and production costs are high

[0003] The air oxidation iron removal process is adopted, which is theoretically feasible, but in the actual production process, there will be many shortcomings such as slow air oxidation speed, low oxidation efficiency, and large steam consumption; it is precisely because of these The existence of shortcomings leads to a certain risk factor in this air oxidation iron removal process, which indirectly has a certain impact on the stability of the entire wet production

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