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Treatment technique of rare earth fluorocarbonate ores with grade of 62-72%

A treatment process and fluorocarbonic acid technology, applied in the field of rare earth, can solve the problems of low yield of praseodymium neodymium and difficult leaching of maglev ore, and achieve the effects of increasing the consumption of hydrochloric acid and improving the comprehensive economic benefits.

Active Publication Date: 2015-01-14
LESHAN SHENGHE RARE EARTH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a maglev ore treatment process to solve the problem that the maglev ore with a grade between 62% and 72% is difficult to leach and the yield of praseodymium and neodymium is not high

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] 2000kg raw ore REO 66.7%, dried at 250°C for 3 hours, and sintered at 420°C for 6 hours to obtain cooked ore REO 80%.

[0039] Add the cooked ore to the reaction tank and add 1.5N hydrochloric acid to react for 2 hours. Add 180g / L sodium hydroxide to the slag and turn it into alkali for 4 hours. The slag was washed once with clean water, and the second excellent slag was detected, REO78% La 2 o 3 / REO 2.75% CeO 2 / REO 95.2% Pr 6 o 11 / REO 0.35% Nd 2 o 3 / REO 0.95.

Embodiment 2

[0041] 2000kg of raw ore REO 67.76%, dried at 300°C for 2 hours, and sintered at 460°C for 7 hours to obtain cooked ore REO 78.45%.

[0042] Add the cooked ore to the reaction tank and add 1.5N hydrochloric acid to react for 3 hours. Add 200g / L sodium hydroxide to the slag and turn it into alkali for 5 hours. The slag was washed once with clean water, and the second excellent slag was detected, REO86.88% La 2 o 3 / REO 2.73% CeO 2 / REO 95.85% Pr 6 o 11 / REO 0.31% Nd 2 o 3 / REO 0.89%.

Embodiment 3

[0044] 2000kg of raw ore REO 66.54%, dried at 350°C for 2.5 hours, and fired at 500°C for 8 hours to obtain cooked ore REO 79.05%.

[0045] Add the cooked ore to the reaction tank and add 1.5N hydrochloric acid to react for 2.5 hours. Add 190g / L sodium hydroxide to the slag and turn it into alkali for 10 hours. The slag was washed once with clean water, and the second excellent slag was detected, REO90.45% La 2 o 3 / REO 2.70% CeO 2 / REO 95.94% Pr 6 o 11 / REO 0.21% Nd 2 o 3 / REO 0.79%.

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Abstract

The invention discloses a treatment technique of rare earth fluorocarbonate ores with the grade of 62-72%, which comprises the following steps: (1) drying rare earth fluorocarbonate magnetic suspension ores at 250-350 DEG C for 2-3 hours; (2) igniting the dried magnetic suspension ores at 400-600 DEG C with naked fire for 6-8 hours; (3) reacting the ignited magnetic suspension ores in a 1-1.5N hydrochloric acid system for 2-3 hours to obtain a rare earth solution and residues; (4) transferring the residues into a high-temperature high-pressure reaction kettle, reacting in a 180-200 g / L alkali solution system for more than 4 hours; (5) washing the residues subjected to alkali reaction to a neutral state; and (6) reacting the washed residues in a 2-2.5N hydrochloric acid system for 2-3 hours to obtain a rare earth solution and a cerium concentrate. The technique implements optimal leaching of magnetic suspension ores. The technique prevents the conditions for generating chlorine, so that the production process is safer and more environment-friendly. The leaching rate of the main products (praseodymium and neodymium elements) in the magnetic suspension ores is higher than 98% which is much higher than the original leaching level. The technique greatly enhances the comprehensive economic benefits of the magnetic suspension ores of the rare earth smelting separation enterprise.

Description

technical field [0001] The invention belongs to the field of rare earths, and in particular relates to a treatment process for rare earth maglev ores. Background technique [0002] At present, there is no proprietary leaching process for fluorocarbon rare earth maglev ore in Sichuan, and all rare earth smelting and separation enterprises adopt the common hydrochloric acid system leaching process for fluorocarbonic acid rare earth magnetic separation. [0003] Due to the decline in the grade of the existing fluorocarbon rare earth raw ore, especially the magnetic levitation ore with a grade between 62% and 72%, the rare earth concentrate enriched through the magnetic separation process has gradually been unable to meet the needs of rare earth smelting and separation. Combined with the high grade and low price and cost of the produced maglev ore, but there has been no special smelting and separation process for this kind of concentrate in the rare earth smelting and separation...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B59/00C22B1/00C22B3/10C22B3/12
CPCY02P10/20
Inventor 金占云曾明童德贵夏磊张双明陈雪松胡晓莉刘英
Owner LESHAN SHENGHE RARE EARTH CO LTD