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Method for increasing alkali decomposition rate of monazite concentrates

A monazite and decomposition rate technology, applied in the direction of improving process efficiency, can solve the problems of radioactive slurry on-site environmental impact, low heat utilization rate, high energy consumption of equipment, etc., to reduce the frequency of material transfer, optimize the operation mode, run Stable and reliable effect

Inactive Publication Date: 2021-06-15
湖南中核金原新材料有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The traditional open alkali decomposition reaction tank has disadvantages in its technology: the equipment is open, and there are aerosols in the operation site that may cause health damage to the operators and environmental hazards, and the risk factor that the splashed slurry may burn the workers on site; the equipment Poor insulation effect, lower heat utilization rate and high energy consumption
[0005] Traditional alkali decomposition reactors have a low heat utilization rate. Generally, external heating is used to increase the reaction temperature and prolong the decomposition reaction time to achieve the highest possible decomposition efficiency. The equipment has high energy consumption, low heat utilization rate, and low alkali decomposition rate ( Generally 96%) questions
[0006] The traditional alkali decomposition reactor is an open equipment, and the production device is not sealed, resulting in material leakage and hot slurry splashed out during boiling to scald (burn) the on-site operators. At the same time, there are aerosols and radioactive slurry that affect and harm the on-site environment. human health issues

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Put 1t of monazite concentrate (REO: 56.24%) into the -325 mesh slurry obtained after grinding into a fully enclosed alkali decomposition tank, add 2.8t of concentrated lye (NaOH: 54.2%) at the same time, and start stirring device, steam heating equipment and automatic control system. The reaction temperature was controlled to gradually increase from 83°C to 148°C, the pressure was controlled at no more than 0.05MPa, and the reaction time was 10.0h. The decomposition reaction is complete, turn off the heating system. Add monazite concentrate weight 4t hot water to the slurry to dilute, continue to stir for 0.5h, turn off the stirring, keep the temperature of the material above 80°C, age for 12h, siphon the supernatant, and then add a certain amount according to the amount of bottom slurry Doubling the volume of hot water to wash the base slurry multiple times in countercurrent, the washing water temperature is greater than 70°C, and the washed slurry is sent to the sol...

Embodiment 2

[0034] Add 1t of monazite concentrate (REO: 51.86%) to the -325 mesh slurry obtained after grinding into a fully enclosed alkali decomposition tank, and at the same time add 3.1t of concentrated lye (NaOH: 52.9%), and start stirring device and steam heating equipment and automatic control system. The reaction temperature was controlled to gradually increase from 81°C to 145°C, the pressure was controlled at no more than 0.05MPa, and the reaction time was 9.5h. The decomposition reaction is complete, turn off the heating system. Adding water to the slurry for dilution, aging, siphoning the supernatant, repeated countercurrent washing, and filtering are the same as in Example 1.

[0035] Sampling was sent for analysis to detect the total alkalinity and alkali decomposition rate in the slurry with complete alkali decomposition reaction, the total alkalinity: 19.5%, and the alkali decomposition rate 99.79%.

Embodiment 3

[0037] Add 1t of monazite concentrate (REO: 54.12%) to the -325 mesh slurry obtained after grinding into a fully enclosed alkali decomposition tank, and at the same time add 2.9t of concentrated lye (NaOH: 51.7%), and start stirring device and steam heating equipment and automatic control system. The reaction temperature was controlled to gradually increase from 82°C to 155°C, the pressure was controlled at no more than 0.05MPa, and the reaction time was 11.5h. The decomposition reaction is complete, turn off the heating system. Adding water to the slurry for dilution, aging, siphoning the supernatant, repeated countercurrent washing, and filtering are the same as in Example 1.

[0038] Sampling was sent for analysis to detect the total alkalinity and alkali decomposition rate in the slurry with complete alkali decomposition reaction, the total alkalinity: 17.5%, and the alkali decomposition rate 99.61%.

[0039] The invention relates to a new method for improving the alkali...

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Abstract

The invention belongs to the technical field of rare earth smelting production, and particularly relates to a method for increasing the alkali decomposition rate of monazite concentrates. Ore pulp obtained after the monazite concentrates are ground and concentrated alkali liquor are put into a totally-closed alkali decomposition tank, the alkali decomposition reaction temperature is controlled to range from 80 DEG C to 160 DEG C, the pressure is controlled to range from 0.01 MPa to 0.5 MPa, the reaction time ranges from 4 h to 12 h, and the total alkalinity of pulp ranges from 15% to 25% when alkali decomposition is achieved completely. Qualified monazite concentrate pulp obtained after grinding and a high-concentration sodium hydroxide solution are added into a totally-closed decomposition tank together to be mixed, a micro-pressure alkali decomposition reaction is carried out through self reaction heat or external heating, reaction heat losses, aerosol and radioactive pulp are prevented from polluting the environment and harming human health, and hot pulp splashed during boiling is effectively prevented from scalding and chemically burning field operators.

Description

technical field [0001] The invention belongs to the technical field of rare earth smelting and production, and in particular relates to a method for increasing the alkali decomposition rate of monazite concentrate. Through the alkali decomposition reactor, the decomposition process is fully sealed and micro-pressure controlled, with simple process, convenient operation, reliable operation, safety and environmental protection, and high alkali decomposition rate. Background technique [0002] Monazite is an industrial rare earth phosphate mineral. The content of rare earth oxides in monazite concentrate is generally REO: 50% to 60%. In industry, caustic soda decomposition is generally used to process monazite concentrate. [0003] In industry, the traditional monazite concentrate alkali decomposition reactor is an open decomposition tank, and the qualified monazite concentrate slurry after grinding is mixed with high-concentration sodium hydroxide solution in the alkali decomp...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B59/00C22B3/12C22B3/10
CPCC22B59/00C22B3/12C22B3/10Y02P10/20
Inventor 谭国强曾中贤王超许昆刘浩尹亮李春湘姜子奕曾健杨桂云洪穗
Owner 湖南中核金原新材料有限责任公司
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