Method for restoring ionic rare earth ore ammonium salt leaching site

A technology of ionic rare earth and repair method, which is applied in the repair field of ionic rare earth ore ammonium salt leaching site, and can solve problems such as imbalance of calcium and magnesium nutrient elements, pollution, etc.

Active Publication Date: 2021-09-10
GRIREM ADVANCED MATERIALS CO LTD +1
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  • Description
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  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Aiming at the problems of ammonium nitrogen and sulfate root pollution, acidification, calcium and magnesium nutrient element ratio imbalance and other problems in the ionic rare earth ore ammonium salt leaching site, the present invention provides a repair method for the ionic rare earth ore ammonium salt leaching site, which can realize Enhanced leaching of residual ammoni

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  • Method for restoring ionic rare earth ore ammonium salt leaching site
  • Method for restoring ionic rare earth ore ammonium salt leaching site
  • Method for restoring ionic rare earth ore ammonium salt leaching site

Examples

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Example Embodiment

[0054] Example 1

[0055] After a ammonium salt leaching, the pH of the rare earth tailings was 3.39, and the alkali is 1540 mg / kg, the speed of calcium is 32.89 mg / kg, and the speed magnesium is 17.98 mg / kg, and calcium is 1.83.

[0056] The rare earth tailings after the ammonium salt is removed after the ammonium salt, and the cationic concentration of 0.05 mol / L, calcium-containing and / or magnesium containing salt solution is performed in a salt solution of the ammonium salt and / or magnesium. The liquid solid ratio of the rare earth tailings was 0.3m after leaching of the solution and ammonium salt. 3 / t; a quadratic ratio of calcium hydroxide solution is carried out, and the liquid solid ratio of the rare earth tailings after the primary elimination is 0.4m. 3 / T, the molar concentration of calcium hydroxide was 0.02 mol / L, and the pH was 12.53. Extra ion-type rare earth mine immersion is returned to the next ion-type rare earth mining. See Table 1 for the spec...

Example Embodiment

[0059] Example 2

[0060] After a ammonium salt leaching, the pH of the rare earth tailings was 3.39, and the alkali is 1540 mg / kg, the speed of calcium is 32.89 mg / kg, and the speed magnesium is 17.98 mg / kg, and calcium is 1.83.

[0061] The cationic concentration of the rare earth tailings after the ammonium salt and / or magnesium containing a cationic concentration change in the cationic concentration of the cationic concentration of the cationic concentration of the ammonium salt and / or magnesium containing a cationic concentration of the cationic concentration of the ammonium salt. The liquid solid ratio of rare earth tailings after leaching with ammonium salt is 0.4m 3 / t; a quadratic ratio of calcium hydroxide solution is carried out, and the liquid solid ratio of the rare earth tailings after the primary elimination is 0.4m. 3 / T, the molar concentration of calcium hydroxide was 0.02 mol / L, and the pH was 12.53. Extra ion-type rare earth mine immersion is retu...

Example Embodiment

[0064] Example 3

[0065] After a ammonium salt leaching, the pH of the rare earth tailings was 3.39, and the alkali is 1540 mg / kg, the speed of calcium is 32.89 mg / kg, and the speed magnesium is 17.98 mg / kg, and calcium is 1.83.

[0066] Use of calcium and / or magnesium salt solution after leaching rare earth salts rinsed once tailings, calcium and / or magnesium cations in the salt solution at a concentration of 0.05mol / L, calcium and / or magnesium with an ammonium salt solution after leaching liquid to solid ratio of the rare earth changes tailings in Table 3; calcium hydroxide solution secondary rinsed with a liquid to solid ratio of the rare earth is rinsed after the tailings 0.4m 3 / T, the molar concentration of calcium hydroxide was 0.02 mol / L, and the pH was 12.53. Extra ion-type rare earth mine immersion is returned to the next ion-type rare earth mining. See Table 3 for specific effects. As can be seen, the use of calcium and / or magnesium salt rinse solutio...

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Abstract

The invention relates to a method for restoring an ionic rare earth ore ammonium salt leaching site, which comprises the steps of carrying out primary leaching by using a calcium and/or magnesium-containing salt solution and carrying out secondary leaching by using a calcium-containing alkaline aqueous solution or slurry, so that reinforced leaching of residual ammonium salt in the ammonium salt ore leaching site, controllable adjustment of the pH value, in-situ chemical curing of sulfate radicals and rapid regulation and control of the content of calcium and magnesium nutrient elements can be achieved, the used leaching water amount is small, the leaching period is short, the leaching effect is good, the technology is simple, the cost is low, and a solid technical guarantee can be provided for ion type rare earth ore ammonium salt leaching site restoration and eco-friendliness.

Description

technical field [0001] The invention relates to the technical field of resources and the environment, in particular to a repair method for an ionic rare earth ore ammonium salt leaching site. Background technique [0002] In ionic rare earth ores, rare earths are adsorbed on aluminosilicate minerals in a hydrated ion state, and the raw ore grade is only 0.03% to 0.1% (REO). my country has pioneered the production of rare earth concentrates by ammonium sulfate leaching-ammonium bicarbonate precipitation enrichment The unique technology has realized the large-scale development and utilization of ultra-low-grade rare earth ores. However, the process is lengthy and the total rare earth yield is less than 70%. The production of 1 ton of rare earth concentrate (REO) consumes 7 to 14 tons of ammonium sulfate and 5 to 8 tons of ammonium bicarbonate, and a large amount of ammonium salt remains in the leaching site and is slowly released, resulting in The ammonia nitrogen in the surfa...

Claims

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Application Information

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IPC IPC(8): B09C1/02C09K17/06C09K17/02C09K109/00
CPCB09C1/02C09K17/06C09K17/02B09C2101/00C09K2109/00
Inventor 赵龙胜黄小卫冯宗玉尹海峰刘德鹏尹伟强齐少雷徐旸范波
Owner GRIREM ADVANCED MATERIALS CO LTD
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