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Leaching Technology of Fluorocarbonate Rare Earth Ore

A technology of fluorocarbonic acid and rare earth ores, which is applied in the field of rare earths, can solve the problems of low leaching rate of rare earths in the hydrochloric acid method, and achieve the effects of low equipment occupancy, low steam consumption, and high-efficiency dissolution

Active Publication Date: 2017-05-31
LESHAN SHENGHE RARE EARTH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] The purpose of the present invention is to provide a leaching process of fluorocarbonate rare earth ore, which solves the problem of low rare earth leaching rate in the hydrochloric acid method and the use of a large amount of reducing agent

Method used

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  • Leaching Technology of Fluorocarbonate Rare Earth Ore

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] 400 grams of raw ore REO 65.48%, dehydrated at 580°C for 1 hour and roasted at 525°C for 5 hours to obtain cooked ore REO 74.8%.

[0047] Put 200 grams of cooked ore into a 2000 ml beaker, react with 1.5N hydrochloric acid for 1 hour, add 80 g / L sodium hydroxide to the slag and turn it into alkali for 2 hours, wash the slag until it is neutral, then add 2N hydrochloric acid and sulfuric acid, a stabilizer to prevent reduction, The molar ratio of sulfuric acid added to hydrochloric acid was 1%, reacted for 1 hour, washed the slag with clean water once after the reaction, dried the slag, weighed its mass 11.8g, detected, REO8.06% La 2 o 3 / REO 36.53% CeO 2 / REO 51.62% Pr 6 o 11 / REO 2.27% Nd 2 o 3 / REO 7.47%

[0048] REO total leaching rate 99.36%

[0049] The leaching rate of praseodymium and neodymium is 99.53%.

Embodiment 2

[0051] 400 grams of raw ore REO 66.34%, dehydrated at 580°C for 1 hour and roasted at 525°C for 5 hours to obtain cooked ore REO 75.12%.

[0052] Put 200 grams of cooked ore into a 2000 ml beaker, react with 1.5N hydrochloric acid for 1 hour, add 80 g / L sodium hydroxide to the slag and turn it into alkali for 2 hours, wash the slag until it is neutral, then add 2N hydrochloric acid and sulfuric acid, a stabilizer to prevent reduction, The molar ratio of sulfuric acid added to hydrochloric acid was 1%, reacted for 1 hour, washed the slag with clean water once after the reaction, dried the slag, weighed its mass 19.9g, detected, REO2.62% La 2 o 3 / REO 30.15% CeO 2 / REO 59.61% Pr 6 o 11 / REO 1.26% Nd 2 o 3 / REO 6.95%

[0053] REO total leaching rate 99.65%

[0054] The leaching rate of praseodymium and neodymium is 99.78%.

Embodiment 3

[0056] 400 grams of raw ore REO 66.41%, dehydrated at 625°C for 1 hour and roasted at 580°C for 3 hours to obtain cooked ore REO 75%.

[0057]Put 200 grams of cooked ore into a 2000 ml beaker, react with 2.5N hydrochloric acid for 2.5 hours, add 120g / L sodium hydroxide alkali to the slag and turn it for 0.7 hours, wash the slag until it is neutral, then add 4N hydrochloric acid and sulfuric acid, a stabilizer to prevent reduction, The molar ratio of sulfuric acid added to hydrochloric acid was 8%, reacted for 3 hours, washed the slag once with clean water after the reaction, dried the slag, weighed its mass 11.8g, detected, REO7.92% La 2 o 3 / REO 9.98% CeO 2 / REO 85.92% Pr 6 o 11 / REO 1.13% Nd 2 o 3 / REO2.35%

[0058] REO total leaching rate 99.38%

[0059] The leaching rate of praseodymium and neodymium is 99.85%.

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Abstract

The invention discloses a leaching technology of fluorine carbonate rare earth ore. The leaching technology comprises the following steps that 1, fluorine carbonate rare earth ore is dried and dewatered for 1-2 h at the temperature of 580-645 DEG C; 2, the dried fluorine carbonate rare earth ore is fired for 2-6 h at the constant temperature of 525-600 DEG C; 3, the fired fluorine carbonate rare earth ore reacts for 1-4 h in a 1.5-3N hydrochloric acid system, and after the reaction is completed, flocculant is added for clarification, material liquid is siphoned, and residues are washed; 4, the washed residues are transferred into a reaction still to react for 0.5-2 h under a 40-150g / L sodium hydroxide system; and 5, residues obtained after alkali liquor treatment are washed to be neutral, 2-6 N of hydrochloric acid is firstly added, then sulfuric acid is added, the adding amount of sulfuric acid is 0.5%-15% of the molar ratio of hydrochloric acid, a reaction is carried out for 1-3 h, and residues and liquid are separated after the reaction is completed. Efficient leaching of the fluorine carbonate rare earth ore is achieved. Residual REO generated by the original technology is about 15%-20%, and a large amount of praseodymium and neodymium is left. According to the technology, the total leaching rate is increased, the residue REO ranges from 2.6% to 9%, and the utilization rate of rare earth is increased.

Description

technical field [0001] The invention belongs to the field of rare earths, and in particular relates to a leaching process of rare earth fluorocarbonates. Background technique [0002] Today's Sichuan fluorocarbonate rare earth ore leaching process mainly includes hydrochloric acid excellent dissolution-reduction complete dissolution and sulfuric acid complete dissolution. [0003] Existing hydrochloric acid method i.e. hydrochloric acid excellent dissolution-reduction complete dissolution has the following disadvantages: [0004] 1. The amount of residual slag is large and the total amount of rare earths is high. A well-made REO of 15%-20% is almost as good as a REO of 30%-50%, resulting in a low total rare earth leaching rate. [0005] 2. After the reducing agent is used, the ferric ions in the solution are converted into divalent iron ions, and a large amount of ferrous sulfide is produced in the sodium sulfide lead removal process, which entrains the rare earth materia...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B3/10C22B3/44C22B59/00C22B1/02
CPCC22B1/02C22B3/10C22B3/44C22B59/00Y02P10/20
Inventor 姚佳夏磊陈宗王忠清王大海
Owner LESHAN SHENGHE RARE EARTH CO LTD