Method for preparing ammonium sulfate and Fe3O4 from titanium dioxide production waste acid solution

Abstract

The invention relates to a method for preparing ammonium sulfate and Fe3O4 from titanium dioxide production waste acid solution. The method is characterized by comprising the following steps: (1) concentrating the titanium dioxide production waste acid solution to 25-35wt%, sending the concentrated solution to a storage tank for standby; (2) sending the solution concentrated in the step (1) to an oxidation pond, introducing ammonia water, stirring with a stirrer to perform neutralization reaction; (3) introducing steam in the oxidation pond after the reaction to ensure that the temperature of the solution is increased to 90-95 DEG C, introducing compressed air at 60 DEG C while heating continuously to ensure that the oxidation reaction of Fe(OH)2 is performed continuously and Fe3O4 precipitate is obtained; and (4) sending the precipitated Fe3O4 to a filter press to perform solid-liquid separation, wherein the solid is iron black and the liquid is ammonium sulfate solution. In the method of the invention, the titanium dioxide production waste acid is used to react with ammonia water to prepare ammonium sulfate; and the technology is mature and the process is simple and is convenient to operate.

Description

technical field [0001] The invention belongs to the treatment technology of dilute sulfuric acid, a waste by-product of titanium dioxide, and specifically relates to a method for preparing ammonium sulfate and Fe from titanium dioxide production waste acid solution. 3 o 4 Methods. Background technique [0002] Since the reform and opening up, China's economic development has made remarkable achievements. However, the extensive economic growth mode has not changed fundamentally, the contradiction of resource constraints has become increasingly prominent, and the pressure on the environment is increasing. The "Eleventh Five-Year Plan" is a critical period for my country to build a well-off society in an all-round way. We are facing unprecedented development opportunities and severe challenges from various aspects. The most prominent challenge is the constraints of resources and environment on economic development. With the increase of population and the acceleration of indu...

AI Technical Summary

Problems solved by technology

The existing titanium dioxide production waste acid treatment technologies mainly include the following treatment methods: (1) use titanium dioxide waste acid for pickling plates in steel mills or supply paper mills, printing and dyeing factories, etc. for alkaline wastewater treatment , but due to the operation and production process problems, the fundamental treatment problem of titanium dioxide waste acid cannot be solved

(2) Manganese sulfate and magnesium sulfate are produced with titanium white waste acid, but the production amount is too small to solve the fundamental treatment problem of titanium white waste acid

The disadvantage is that the nitrogen content is low, but in addition to nitrogen, ammonium sulfate also contains sulfur, which is extremely beneficial to crops

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