A kind of treatment method of vanadium-containing wastewater

Abstract

The invention provides a method for treating vanadium-containing wastewater. The method comprises the following steps: adding ferrous sulfate to the vanadium-containing wastewater for reaction; adjusting the pH of the solution to 3-4.5 after the reaction is completed, heating and stirring for the reaction, and after a period of time Adjust the pH of the solution to be 6-6.5, continue to stir, and after the reaction is completed, solid-liquid separation is performed to obtain iron vanadate precipitation and a chromium-containing solution; the phosphoric acid amino acid resin is used to adsorb the chromium-containing solution, and after the adsorption is completed, the phosphoric acid amino acid resin is desorbed, A purified chromium-containing solution is obtained. Through the improvement of the process and the control of the conditions, the invention makes the reduction of hexavalent chromium and the preparation of the polymerized ferric sulfate to be carried out under the same reaction system, and the efficient separation and resource of vanadium and chromium in the vanadium-containing wastewater are realized to the greatest extent. Chemical recovery, among which, the recovery rate of vanadium element is over 90%, and the recovery rate of chromium element is over 93%. In addition, the whole reaction is continuous, the operation is simple, the process flow is saved, and the method has a good application prospect.

Description

technical field [0001] The invention relates to the technical field of waste water treatment and recovery of valuable elements, in particular to a method for treating waste water containing vanadium, in particular to a method for recovering valuable elements from waste water containing vanadium and chromium. Background technique [0002] Vanadium has the title of "monosodium glutamate of modern industry", and it is an indispensable and important material for the development of modern industry, modern national defense and modern science and technology. From a global perspective, the consumption of vanadium in the iron and steel industry accounts for 85% of its total production. At the same time, the application of vanadium in chemical industry, vanadium battery, aerospace and other fields is also expanding, and has a good development prospect. [0003] At present, 98% of the world's known vanadium reserves are produced in vanadium-titanium magnetite, so the coexistence of va...

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Problems solved by technology

[0010] Although the above method has realized the effective recovery of vanadium and chromium in the vanadium-containing solution to a certain extent, there are still some problems: after the direct reduction method precipitates, vanadium and chromium exist in the slag together in the form of precipitates, which need to be further separated; The method takes a long time, and the recovery rate of vanadium is only about 75%; the steps of the adsorption method are cumbersome, which increases the process flow, which is not conducive to popularization and application