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

A rare earth carbonate production process technology, applied in the direction of rare earth metal compounds, rare earth metal carbonates, chemical instruments and methods, etc., can solve the problems of large human errors, first-stage continuous sinking tanks, affecting product performance, etc. Achieve the effect of reducing manual labor, solving the problem of sinking, and stabilizing product quality

Inactive Publication Date: 2017-09-22
CHINA NORTHERN RARE EARTH (GROUP) HIGH TECH CO LTD
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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 ammon

Method used

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Examples

Experimental program
Comparison scheme
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Example Embodiment

[0038] Example 1:

[0039] (1) The lanthanum chloride feed solution with a concentration of 1.4 to 1.7 mol / L (calculated as REO) enters from the first stage continuous settling tank, and the precipitant ammonium bicarbonate solution is added from the first to sixth stages to carry out continuous neutralization reaction;

[0040] (2) When the pH value measured by the pH meter on the 5th continuous settling tank is less than the value between 5.6 and 6.2, and the pH value measured by the pH meter on the 6th continuous settling tank is less than the value between 5.8 and 6.4, the 5th 1. The ammonium bicarbonate flowmeters on the 6-stage continuous settling tank are all in the open state, and the ammonium bicarbonate solution is automatically added until the pH value of the fifth stage is controlled at 5.6-6.2, the ammonium bicarbonate solution flowmeter is automatically closed, and the ammonium bicarbonate solution is stopped; When the pH value of the sixth stage is 5.8-6.4, the ...

Example Embodiment

[0041] Example 2:

[0042] (1) The lanthanum cerium chloride feed solution with a concentration of 1.5-1.7mol / L (calculated as rare earth oxide (REO)) enters from the first level continuous settling tank, and the precipitant ammonium bicarbonate solution is added from the first to sixth levels, A continuous neutralization reaction is carried out.

[0043] (2) When the pH value measured by the pH meter on the 5th continuous settling tank is less than the value between 5.6 and 6.2, and the pH value measured by the pH meter on the 6th continuous settling tank is less than the value between 5.8 and 6.4, the 5th 1. The ammonium bicarbonate flowmeters on the 6-stage continuous settling tank are all in the open state, and ammonium bicarbonate is automatically added until the pH value of the 5th stage is controlled at 5.6-6.2, the ammonium bicarbonate flowmeter is automatically closed, and the ammonium bicarbonate is stopped; until the 6th stage When the pH value of the grade is 5.8 ...

Example Embodiment

[0044] Example 3:

[0045] (1) The cerium chloride feed solution with a concentration of 1.5-1.7mol / L (calculated as REO) enters from the first stage continuous settling tank, and the precipitant ammonium bicarbonate solution is added from the first to sixth stages to carry out continuous neutralization reaction.

[0046](2) When the pH value measured by the pH meter on the 5th continuous settling tank is less than the value between 5.6 and 6.2, and the pH value measured by the pH meter on the 6th continuous settling tank is less than the value between 5.8 and 6.4, the 5th 1. The ammonium bicarbonate flowmeters on the 6-stage continuous settling tank are all in the open state, and ammonium bicarbonate is automatically added until the pH value of the 5th stage is controlled at 5.6-6.2, the ammonium bicarbonate flowmeter is automatically closed, and the ammonium bicarbonate is stopped; until the 6th stage When the pH value of the grade is 5.8 to 6.4, the ammonium bicarbonate flo...

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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...

Claims

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Application Information

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IPC IPC(8): C01F17/00
CPCC01F17/247
Inventor 刘威高天佐娄利平梁永生张太红赵志强王蒙军张永华高媛梁亮张文斌方斌汪萍白杰郝一鸣
Owner CHINA NORTHERN RARE EARTH (GROUP) HIGH TECH CO LTD
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