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A kind of restoration method of ionic rare earth ore ammonium salt leaching site

An ionic rare earth and repair method technology, which is applied in the repair field of ionic rare earth ore ammonium salt leaching sites, can solve problems such as pollution, imbalance of calcium and magnesium nutrient elements, and achieve pollution avoidance, less leaching water, and barrier diffusion and the effect of migration

Active Publication Date: 2022-05-06
GRIREM ADVANCED MATERIALS CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • 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 ammonium salts in ammonium salt leaching sites, controllable adjustment of pH, in-situ chemical solidification of sulfate radicals, and rapid regulation of calcium and magnesium nutrient element content, short leaching cycle, good leaching effect, and simple process. It can provide a solid technical guarantee for the eco-friendliness of the ionic rare earth ore ammonium salt leaching site

Method used

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  • A kind of restoration method of ionic rare earth ore ammonium salt leaching site
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  • A kind of restoration method of ionic rare earth ore ammonium salt leaching site

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Effect test

Embodiment 1

[0055] After leaching with a certain ammonium salt, the pH value of the rare earth tailings is 3.39, the alkaline hydrolysis nitrogen is 1540mg / kg, the available calcium is 32.89mg / kg, the available magnesium is 17.98mg / kg, and the calcium-magnesium ratio is 1.83.

[0056] Use a salt solution containing calcium and / or magnesium to wash the rare earth tailings after ammonium salt leaching once. The concentration of cations in the salt solution containing calcium and / or magnesium is 0.05mol / L, and the salt containing calcium and / or magnesium The liquid-solid ratio of rare earth tailings after leaching solution and ammonium salt is 0.3m 3 / t; Calcium hydroxide solution is used for secondary leaching, and the liquid-solid ratio of the rare earth tailings after the first leaching is 0.4m 3 / t, the molar concentration of calcium hydroxide is 0.02mol / L, and the pH value is 12.53. The leachate obtained from the two washings is returned to the next ionic rare earth mine for leaching. ...

Embodiment 2

[0060] After leaching with a certain ammonium salt, the pH value of the rare earth tailings is 3.39, the alkaline hydrolysis nitrogen is 1540mg / kg, the available calcium is 32.89mg / kg, the available magnesium is 17.98mg / kg, and the calcium-magnesium ratio is 1.83.

[0061] A salt solution containing calcium and / or magnesium is used to wash the rare earth tailings after ammonium salt leaching. The change of cation concentration in the salt solution containing calcium and / or magnesium is shown in Table 2. Salt solution containing calcium and / or magnesium The liquid-solid ratio of rare earth tailings after leaching with ammonium salt is 0.4m 3 / t; Calcium hydroxide solution is used for secondary leaching, and the liquid-solid ratio of the rare earth tailings after the first leaching is 0.4m 3 / t, the molar concentration of calcium hydroxide is 0.02mol / L, and the pH value is 12.53. The leachate obtained from the two washings is returned to the next ionic rare earth mine for leach...

Embodiment 3

[0065] After leaching with a certain ammonium salt, the pH value of the rare earth tailings is 3.39, the alkaline hydrolysis nitrogen is 1540mg / kg, the available calcium is 32.89mg / kg, the available magnesium is 17.98mg / kg, and the calcium-magnesium ratio is 1.83.

[0066] Use a salt solution containing calcium and / or magnesium to wash the rare earth tailings after ammonium salt leaching once. The concentration of cations in the salt solution containing calcium and / or magnesium is 0.05mol / L, and the salt containing calcium and / or magnesium The change of the liquid-solid ratio of the rare earth tailings after the solution and ammonium salt leaching is shown in Table 3; the calcium hydroxide solution is used for secondary leaching, and the liquid-solid ratio of the rare earth tailings after the first leaching is 0.4m 3 / t, the molar concentration of calcium hydroxide is 0.02mol / L, and the pH value is 12.53. The leachate obtained from the two washings is returned to the next ionic ...

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Abstract

The invention relates to a method for repairing an ion-type rare earth ore ammonium salt leaching site. The ammonium salt leaching can be realized through primary rinsing with calcium and / or magnesium-containing salt solution and secondary leaching with calcium-containing alkaline aqueous solution or slurry Enhanced leaching of residual ammonium salts on the site, controllable adjustment of pH, in-situ chemical solidification of sulfate radicals, and rapid regulation of the content of calcium and magnesium nutrients. Simple and low cost, it can provide a solid technical guarantee for site restoration and eco-friendliness of ionic rare earth ore ammonium salt leaching.

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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Patent Type & Authority Patents(China)
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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