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A process for obtaining cerium concentrates with a distribution greater than 99% by optimal leaching of fluorocarbonate rare earth ores with hydrochloric acid

A fluorocarbonic acid and rare earth ore technology, applied in the rare earth field, can solve the problems of large residual amount of praseodymium neodymium and low yield of praseodymium neodymium, etc., and achieve the effect of improving the yield

Active Publication Date: 2017-01-18
LESHAN SHENGHE RARE EARTH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to provide a leaching process of fluorocarbonate rare earth ore, to solve the problems of large residual amount of praseodymium and neodymium in the cerium enrichment and low yield of praseodymium and neodymium

Method used

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  • A process for obtaining cerium concentrates with a distribution greater than 99% by optimal leaching of fluorocarbonate rare earth ores with hydrochloric acid
  • A process for obtaining cerium concentrates with a distribution greater than 99% by optimal leaching of fluorocarbonate rare earth ores with hydrochloric acid

Examples

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Effect test

Embodiment 1

[0042] 2000kg raw ore REO 66.71%, cooked ore REO 79% obtained by burning at 420°C for 6 hours.

[0043] Add the cooked ore to the reaction tank, add 0.2Kg of sodium dodecylbenzenesulfonate, and react with 1.5N hydrochloric acid for 1 hour. Add 80g / L sodium hydroxide to the slag and turn it into alkali for 3 hours. After the reaction, wash it with clean water until neutral. Then add 1.5N hydrochloric acid to react for 2 hours. After the reaction, wash the slag once with clean water to detect the second-quality slag, REO75% La 2 o 3 / REO 0.46% CeO 2 / REO 99.02%Pr 6 o 11 / REO 0.11% Nd 2 o 3 / REO 0.35%.

Embodiment 2

[0045] 2000kg raw ore REO 68.71%, cooked ore REO 80.89% obtained by burning at 450°C for 5 hours.

[0046] Add the cooked ore to the reaction tank, add 0.4Kg of sodium dodecylbenzenesulfonate, and react with 2N hydrochloric acid for 1 hour. Add 90g / L sodium hydroxide to the slag and turn it into alkali for 2 hours. , reacted with 1N hydrochloric acid for 1 hour, washed the slag once with clean water after the reaction, and detected the second excellent slag, REO76% La 2 o 3 / REO 0.36% CeO 2 / REO 99.01%Pr 6 o 11 / REO 0.19% Nd 2 o 3 / REO 0.38%.

Embodiment 3

[0048] 2000kg raw ore REO 65.41%, cooked ore REO 78.75% obtained by burning at 500°C for 3.5 hours.

[0049] Add the cooked ore to the reaction tank, add 0.8Kg of sodium dodecylbenzenesulfonate, and react with 2N hydrochloric acid for 2 hours. Add 150g / L sodium hydroxide to the slag and turn it into alkali for 1.5 hours. After the reaction, wash with water until neutral, and then Add 1.2N hydrochloric acid and react for 1 hour. After the reaction, wash the slag once with clean water, and detect the second excellent slag, REO78.43% La 2 o 3 / REO 0.35% CeO 2 / REO99.15% Pr 6 o 11 / REO 0.11% Nd 2 o 3 / REO 0.29%.

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Abstract

The invention discloses a technology for obtaining cerium enrichment with a partition larger than 99% by optimal extraction of fluoride carbonate rare earths by hydrochloric acid. The invention comprises the following steps: (1) burning the fluoride carbonate rare earths at 400-600 DEG C for 3-6 hours; (2) cooling down the burned fluoride carbonate rare earths at normal temperatures; (3) putting the smelted ore of the fluoride carbonate rare earths into a 1.5-3N hydrochloric acid system containing 0.2-2Kg surfactant sodium dodecyl benzene sulfonate to react for 2-3 hours, defecating by adding flocculant after reaction, siphoning out feed liquid and washing residuals; (4) sending the residuals into a reactor and reacting in a 80-300g / L alkali liquor system for 1-3 hours; (5) washing the residuals after being reacted with alkali by water until the residuals are neutral; (6) reacting the washed residuals in a 1-2.5N hydrochloric acid system for 1-2 hours to obtain rare earth feed liquid and cerium enrichment. The invention realizes optimal extraction of fluoride carbonate rare earths. According to the invention, extraction ratio of main product praseodymium and neodymium elements from the fluoride carbonate rare earths is higher than 99.5%, which is much higher than existing extraction level. Reaction period of the invention is far lower than existing technologies so that fluoride carbonate rare earths efficiency is tremendously improved during enterprises engaging in rare earth smelting and separating.

Description

technical field [0001] The invention belongs to the field of rare earths, and in particular relates to a leaching process of rare earth fluorocarbonate ore, which includes preferential leaching control of high-priced elements of rare earth fluorocarbonate ore and replacement reaction in the leaching process of rare earth elements. Background technique [0002] Most of the obtained cerium concentrates are about 95% in the current Sichuan fluorocarbonate rare earth ore leaching process. [0003] Because the cerium enrichment distribution obtained by the existing fluorocarbonate rare earth ore leaching process is only about 95%, it contains a large amount of lanthanum and praseodymium neodymium. It is a waste of resources and the cost of further processing the cerium enrichment is too high and uneconomical. [0004] Therefore, it is very important to study the leaching process to improve the leaching rate of praseodymium and neodymium to improve the utilization rate and econom...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B59/00C22B3/10C22B3/46C22B1/02
CPCY02P10/20
Inventor 姚佳曾明金占云夏磊王忠清
Owner LESHAN SHENGHE RARE EARTH CO LTD