Method for automatically adjusting reaction end point in continuous precipitation production process of rare earth carbonate

Abstract

The invention discloses a method for automatically adjusting a reaction end point in a continuous precipitation production process of rare earth carbonate. The method comprises the following steps: enabling rare earth liquid to enter from a first-stage continuous precipitation tank, adding a precipitating agent into the continuous precipitation tank, and performing a continuous neutralization reaction; mounting an online pH meter at a circulating position of the continuous precipitation tank, and adjusting the addition amount of the precipitating agent so as to keep the pH value of the continuous precipitation tank to be 5.6-6.4 to obtain qualified rare earth carbonate product. By the method, production is stable and automatic continuous precipitation of the rare earth carbonate can be achieved.

Description

technical field [0001] The invention relates to a method for adjusting the reaction end point of rare earth carbonate, in particular to a method for automatically adjusting the reaction end point in the continuous precipitation production process of rare earth carbonate. Background technique [0002] In the traditional rare earth carbonate production process, the pH value of the reaction system is measured manually by using pH test paper. The main disadvantage of this method is that the measurement results are very inaccurate, and at the same time, the human error is very large, which is likely to cause the following defects: [0003] (1) The amount of ammonium bicarbonate added to the 6th stage continuous settling tank is insufficient, so that the rare earth content in the supernatant after the reaction is terminated exceeds the standard; [0004] (2) The amount of ammonium bicarbonate added to the 6th level continuous settling tank is excessive, resulting in excessive ammo...

AI Technical Summary

Problems solved by technology

[0002] In the traditional rare earth carbonate production process, the pH value of the reaction system is measured manually by using pH test paper. The main disadvantage of this method is that the measurement results are very inaccurate, and at the same time, the human error is very large, which is likely to cause the following defects:

[0004] (2) The amount of ammonium bicarbonate added to the 6th level continuous settling tank is excessive, resulting in excessive ammonium bicarbonate returned to the 1st level, causing the first level to react violently, eventually causing the 1st level continuous settling tank to erupt, and the production line cannot run stably, thus Affect product quality stability and product performance

[0005] The above points restrict the stability of the industrial production of rare earth carbonate continuous precipitation, increase the production cost, and affect the performance of the product at the same time