Production process of magnesia used for rear earth solution precipitator

A production process and rare earth solution technology, which is applied in the field of rare earth preparation to achieve the effects of reducing production costs, expanding the scope of application and solving wastewater treatment

Active Publication Date: 2007-09-19
BAOTOU HUAMEI RE PRODS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The technical problem solved by the invention is: recycle waste water, solve the pollution of waste water to the environment, greatly reduc...

Method used

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  • Production process of magnesia used for rear earth solution precipitator
  • Production process of magnesia used for rear earth solution precipitator

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] (1) Add 2.5m 3 Water, heated to 40±5°C, add 375Kg magnesia, stir and adjust the slurry.

[0021] (2) Add mixed sulfuric acid rare earth material containing La, Ce, Pr, Nd, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb, Lu, Y in the batching tank with a rare earth concentration of 50g / L Liquid 20m 3 , add water 5m 3 , Stir the ingredients, detect that the rare earth concentration is 40.5g / L, and heat to 40±5°C.

[0022] (3) the magnesium oxide slurry prepared in the step (1) and the rare earth feed liquid prepared in the step 2) were respectively mixed with 2.5m 3 / hour and 25m 3 The flow rate per hour is fed into the precipitation reaction tank, and the feeding is stopped after 1 hour, and the stirring is continued for 90 minutes (controlling the reaction temperature: between 40±5°C). The concentration of rare earth in the supernatant is detected to be 0.08g / L, and the precipitated slurry is poured into the transition tank for filtration and dehydration to produce a filter c...

Embodiment 2

[0031] (1) Add 1.0m 3 Water, heated to 55±5°C, add 375Kg magnesia, stir and adjust the slurry.

[0032] (2) Add mixed sulfuric acid rare earth material containing La, Ce, Pr, Nd, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb, Lu, Y in the batching tank with a rare earth concentration of 50g / L Liquid 20m 3 , add water 10m 3 , Stir the ingredients, detect that the rare earth concentration is 33.8g / L, and heat to 60±5°C.

[0033] (3) Pour the magnesium oxide slurry prepared in step (1) into the precipitation reaction tank first, and then mix the rare earth feed liquid prepared in step 2) with 30m 3 The flow rate per hour is fed into the precipitation reaction tank, and the feeding is stopped after 60 minutes, and the stirring is continued for 130 minutes (controlling the reaction temperature: between 60±5°C). The rare earth concentration of the supernatant was detected to be 0.02g / L, and the precipitated slurry was poured into the transition tank for filtration and dehydration to produc...

Embodiment 3

[0042] (1) Add 2.5m 3 Water, heated to 75±5°C, add 375Kg magnesia, stir and adjust the slurry.

[0043] (2) Add mixed sulfuric acid rare earth material containing La, Ce, Pr, Nd, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb, Lu, Y in the batching tank with a rare earth concentration of 50g / L Liquid 20m 3 , add water 10m 3 , Stir the ingredients, detect that the rare earth concentration is 33.1g / L, and heat to 40±5°C.

[0044] (3) Put the rare earth material liquid prepared in step 2) into the precipitation reaction tank first, and then mix the magnesium oxide slurry prepared in step (1) with 2.0m 3 The flow rate per hour is fed into the precipitation reaction tank, and the feeding is stopped after 75 minutes, and the stirring is continued for 110 minutes (controlling the reaction temperature: between 40±5°C). The rare earth concentration of the supernatant was detected to be 0.12g / L, and the precipitated slurry was poured into the transition tank for filtration and dehydration to pr...

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Abstract

The present invention belongs to the rare earth preparation field, wherein magnesia serving as precipitator is used for the precipitation process of rare earth solution. The surge tank is filled with water and heated, and magnesia is added into the water to be confected; an amount of water and rare earth feed liquid are confected and injected into dosage bunker to be heated; the confected rare earth feed liquid and magnesia feed liquid are injected into precipitation tank in term of equal equivalent to execute precipitation reaction; the slime after precipitation reaction is pumped into a filter kettle to execute filter dehydration to obtain filter cake which is confected by water and is scrubbed, and then solid rare earth hydrate is obtained after filter dehydration, wherein the wash water can be recovered and reused. The present invention is capable of overcome the disadvantage of the prior art, reducing the cost greatly, overcoming the problem of wastewater treatment, enlarging the application field of precipitator, promoting the clean production of rare earth industry.

Description

1. Technical field [0001] The invention relates to a production process for magnesium oxide used as a rare earth solution precipitant, and belongs to the field of rare earth preparation. 2. Background technology [0002] The precipitants used in the precipitation and crystallization process of traditional rare earth solutions mainly include ammonium bicarbonate, ammonia water and sodium carbonate. Recycling waste water causes pollution to the environment. Some manufacturers have recycled waste water from some systems, but the cost of recycling is high and the scope of application is small. 3. Contents of the invention [0003] The technical problem solved by the invention is: recycle waste water, solve the pollution of waste water to the environment, greatly reduce production cost and waste water recovery cost, expand the application range of precipitant, and benefit the clean production of rare earth industry. [0004] Technical solution: the process steps of the present...

Claims

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Application Information

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IPC IPC(8): C01F17/00
Inventor 马永茂芮新斌郝胜民
Owner BAOTOU HUAMEI RE PRODS
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