Rare earth production wastewater treatment method

Abstract

The invention discloses a rare earth production wastewater treatment method, which comprises the following steps that (1) rare earth production wastewater is introduced into a settling pool; supernate passes through an impurity filter; particle impurities are removed; (2) a mixture of sodium carbonate and sodium bicarbonate is added into wastewater subjected to impurity removal, so that rare earth elements precipitate; solid and liquid are separated; hydrochloric acid is added into a solid phase to obtain rare earth chloride; (3) the separated liquid phase in the second step is introduced into the settling pool; alkali is added into the settling pool; the pH value is regulated to 10 to 13; after still standing, the wastewater is introduced into an intermediate water box in an overflowing mode; the wastewater in the intermediate water box is pumped and lifted into an ammonia gas exhaust device by a lifting pump; ammonia nitrogen in the ammonia gas exhaust device is converted into ammonia gas; ammonia gas is pumped into a gas liquid separator by a vacuum pump; discharged water treated by the ammonia gas exhaust device is detected, and is directly discharged through a water discharge pipe when ammonia nitrogen reaches standards. The treatment quantity is great; the treatment steps are simple; the industrial application can be realized.

Description

technical field [0001] The invention belongs to the field of rare earth production, and in particular relates to a treatment method for rare earth production wastewater. Background technique [0002] Rare earth elements have excellent physical properties such as light, electricity, magnetism, superconductivity, and catalysis, and can be combined with other materials to form new materials with different properties and varieties. They are called contemporary "industrial monosodium glutamate". Rare earth materials have been widely used in various fields of national economy and national defense industry, and play an important role in many fields of contemporary social economy and high technology. However, with the further expansion of the scale of the rare earth industry in recent years, the amount of wastewater discharged by the rare earth industry in smelting and separation has reached more than 20 million tons every year, and the wastewater contains a large amount of rare ear...

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to provide a treatment method for rare earth production wastewater, which solves the problems of high treatment cost and small treatment capacity of existing rare earth wastewater