Method for recovering sodium hydroxide and co-producing sodium fluoride from fluorocarbon cerium alkali transfer process

A technology for the co-production of sodium fluoride and bastnaesium alkali, applied in chemical instruments and methods, alkali metal oxides/hydroxides, alkali metal fluorides, etc., can solve environmental hazards, cannot be directly discharged, secondary Pollution and other issues, to achieve efficient recycling, avoid waste of fluorine resources, and avoid environmental pollution

Active Publication Date: 2021-04-30
SICHUAN PROVINCE LESHAN CITY RUIFENG METALLURGY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The in-depth and meticulous research on the rare earth hydrometallurgy process requires a large amount of chemical raw materials (such as roasting agents, dissolving agents, conversion agents, and extraction agents, etc.) Direct discharge, resulting in secondary pollution, causing serious harm to the environment

Method used

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  • Method for recovering sodium hydroxide and co-producing sodium fluoride from fluorocarbon cerium alkali transfer process

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Recovery of high-quality concentration sodium hydroxide solution:

[0031] Put the rare earth fluoride acid leaching residue containing 100kg REO into the alkali transfer tank, start stirring, and after mixing evenly, add 230kg of sodium hydroxide solution with a mass concentration of 50%, start to heat up, control it at 100°C, and add a small amount during the period The specific amount of water depends on the water loss, but after the duration is 60 minutes, stop stirring, stand still for 30 minutes, transfer the supernatant to the A storage tank, then heat the water to the original liquid level, start stirring, and wash , repeated washing more than 5 times, so that the pH value of the washing liquid is 7, it is considered qualified, the washing liquid for the first 2 times is put into the A storage tank, and the washing liquid for the remaining times is put into another B storage tank for use as The water used for the first 2 washings in the next alkali conversion pr...

Embodiment 2

[0033] Recovery of low mass concentration sodium hydroxide solution:

[0034]Put the rare earth fluoride acid leaching residue containing 100kg REO into the alkali transfer tank, start stirring, and after mixing evenly, add 230kg of sodium hydroxide solution with a mass concentration of 50%, start to heat up, control it at 100°C, and add a small amount during the period The specific amount of water depends on the water loss, but after the duration is 60 minutes, stop stirring, stand still for 30 minutes, transfer the supernatant to the A storage tank, then heat the water to the original liquid level, start stirring, and wash , repeated washing more than 5 times, so that the pH value of the washing liquid is 7, it is considered qualified, the washing liquid for the first 2 times is put into the A storage tank, and the washing liquid for the remaining times is put into another B storage tank for use as The water used for the first 2 washings in the next alkali conversion process...

Embodiment 3

[0036] Recover predetermined mass concentration sodium hydroxide solution:

[0037] Put the rare earth fluoride acid leaching residue containing 100kg REO into the alkali transfer tank, start stirring, and after mixing evenly, add 230kg of sodium hydroxide solution with a mass concentration of 50%, start to heat up, control it at 100°C, and add a small amount during the period The specific amount of water depends on the water loss, but after the duration is 60 minutes, stop stirring, stand still for 30 minutes, transfer the supernatant to the A storage tank, then heat the water to the original liquid level, start stirring, and wash , repeated washing more than 5 times, so that the pH value of the washing liquid is 7, it is considered qualified, the washing liquid for the first 2 times is put into the A storage tank, and the washing liquid for the remaining times is put into another B storage tank for use as The water used for the first 2 washings in the next alkali conversion ...

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Abstract

The invention discloses a method for recovering sodium hydroxide and co-producing sodium fluoride from a bastnaesite alkali transfer process. The method comprises the following steps: (1) roasting bastnaesite concentrate, washing and carrying out acid leaching by using a hydrochloric acid solution; (2) adding an alkaline solution into the leaching residues, stirring and heating; (3) adding a flocculating agent for solid-liquid separation after alkali transfer; (4) producing a sodium hydroxide solution with a high mass concentration or a low mass concentration and producing a sodium fluoride product by adopting solid sodium hydroxide with different contents; and (5) evaporating and concentrating the sodium hydroxide solution with low mass concentration to obtain a sodium hydroxide solution or sodium hydroxide solid with preset mass concentration. Sodium hydroxide solutions with different concentrations can be recovered and prepared by the method, and can be used in a bastnaesite concentrate alkali transfer process or other fields to obtain a sodium fluoride product with high quality and purity of more than or equal to 98%, and the sodium fluoride product can be sold as a product. The method reduces the production cost, reduces the wastewater treatment difficulty, avoids environmental pollution and fluorine resource waste, and is suitable for industrial production.

Description

technical field [0001] The invention relates to the technical field of mineral recovery, in particular to a method for recovering sodium hydroxide and co-producing sodium fluoride from a bastnaesium alkali conversion process. Background technique [0002] Bastnaesite is known to be the rare earth mineral with the largest reserves in the world, and the current mining and usage are also the largest. About 70% of the rare earth raw materials come from bastnaesite, and bastnaesite is a light rare earth mineral. Contains a series of 7 elements including lanthanum and cerium, and has been widely used in traditional industries and high-tech industries due to its unique properties. Although bastnaesite has the characteristics of less non-rare earth impurities and small mineral particles, there have always been problems such as difficulty in recycling other valuable elements and serious pollution of three wastes during the smelting process. [0003] During the smelting process of ba...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B59/00C22B1/02C22B3/10C22B3/12C22B3/22C01D3/02C01D1/42
CPCC22B59/00C22B1/02C22B3/10C22B3/12C22B3/22C01D3/02C01D1/42C01P2006/80Y02P10/20
Inventor 王先荣许思玉朱光荣冯新瑞吴仕伦
Owner SICHUAN PROVINCE LESHAN CITY RUIFENG METALLURGY CO LTD
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