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Restoration method for ion type rare earth ore non-ammonium system ore leaching site

A technology of ion-type rare earth ore and rare earth tailings, which is applied in the field of resources and environment, and can solve problems such as nutrient imbalance

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

AI Technical Summary

Problems solved by technology

[0006] Aiming at the problems of acidification and nutrient imbalance in rare earth ore non-ammonium system leaching sites, the present invention provides a repair method for ionic rare earth ore non-ammonium system leaching sites, which can quickly and control the content of calcium and magnesium nutrient elements in the leaching site Adjustment and partial in-situ solidification can meet the requirements of soil nutrient ratio, and at the same time, it can solve the problem of soil acidification of tailings. The process is simple and the cost is low, which can provide a solid technical guarantee for the ecological friendliness of ion-type rare earth mining process.

Method used

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  • Restoration method for ion type rare earth ore non-ammonium system ore leaching site
  • Restoration method for ion type rare earth ore non-ammonium system ore leaching site
  • Restoration method for ion type rare earth ore non-ammonium system ore leaching site

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Experimental program
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Effect test

Embodiment 1

[0055] The available calcium of the ionic rare earth ore is 274.53 mg / kg, the available magnesium is 25.96 mg / kg, and the ratio of calcium to magnesium is 10.57.

[0056] The ion-type rare earth ore is leached with a leaching agent containing magnesium sulfate. The leaching agent may also contain one or more of calcium chloride, magnesium chloride, and ferrous sulfate. The cation concentration is 0.20mol / L. Solid ratio is 1m 3 / t; wash with clean water once, and the liquid-solid ratio is 0.2m 3 / t, the pH value of the eluent is 7.51; calcium hydroxide solution is used for secondary eluting, and the liquid-solid ratio of the rare earth tailings after the first eluting 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 be used for leaching in the next ion-type rare earth mine. See Table 1 for the specific effect. It can be seen that the pH value of the rare earth tailin...

Embodiment 2

[0060] The available calcium of the ionic rare earth ore is 274.53 mg / kg, the available magnesium is 25.96 mg / kg, and the ratio of calcium to magnesium is 10.57.

[0061] The ionic rare earth ore is leached with a leaching agent containing magnesium sulfate, the cation concentration is 0.20mol / L, and the liquid-solid ratio is 1m 3 / t, the pH value of the rare earth tailings obtained after leaching is 3.41; wash with clean water once, and the liquid-solid ratio is 0.2m 3 / t, the pH value of the eluent is 7.51; calcium hydroxide solution is used for secondary eluting, and the liquid-solid ratio of the rare earth tailings after the first eluting 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 be used for leaching in the next ion-type rare earth mine. See Table 2 for the specific effect. It can be seen that increasing the amount of water for one leaching helps to improv...

Embodiment 3

[0065] The available calcium of the ionic rare earth ore is 274.53 mg / kg, the available magnesium is 25.96 mg / kg, and the ratio of calcium to magnesium is 10.57.

[0066] Magnesium sulfate leaching agent is used to leach ionic rare earth ore, the cation concentration is 0.20mol / L, and the liquid-solid ratio is 1m 3 / t, the pH value of the rare earth tailings obtained after leaching is 3.41; wash with clean water once, and the liquid-solid ratio is 0.2m 3 / t, the pH value of the leaching agent is 4.33, and the pH value of the rare earth tailings after the first leaching is 7.51; the calcium hydroxide solution is used for secondary leaching, and the liquid-solid ratio of the rare earth tailings after the first leaching is changed, Referring to Table 3, the molar concentration of calcium hydroxide in the calcium hydroxide solution is 0.02mol / L, and the pH value is 12.53. The leachate obtained from the two washings is returned to be used for leaching in the next ion-type rare ear...

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Abstract

The invention relates to a restoration method for an ion type rare earth ore non-ammonium system ore leaching site. The restoration method comprises the following steps: leaching ion type rare earth ore by adopting a leaching agent containing magnesium sulfate; carrying out primary leaching on obtained rare earth tailings by adopting clear water; carrying out secondary leaching on the obtained rare earth tailings subjected to primary leaching by adopting a calcium-containing alkaline aqueous solution or slurry; and returning leacheate obtained by leaching twice to the next ion type rare earth ore for ore leaching. According to the restoration method, the rare earth tailings are subjected to primary leaching with clear water and secondary leaching with the calcium-containing alkaline aqueous solution or slurry, so that the content of calcium and magnesium nutrient elements in an ore leaching site can be quickly controlled and adjusted, part of the rare earth tailings is solidified in situ, the requirement for the nutrient ratio of soil is met, the problem of acidification of tailings soil is solved, the used leaching water amount is small, the leaching period is short, the process is simple, the cost is low, and a solid technical guarantee can be provided for eco-friendliness in the mining process of the ion type rare earth ore.

Description

technical field [0001] The invention relates to the technical field of resources and environment, in particular to a method for repairing an ionic rare earth ore non-ammonium system 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 (calculated as REO) consumes 7-14 tons of ammonium sulfate and 5-8 tons of ammonium bicarbonate, and a large amount of ammonium salt remains in the leaching site and is slowly released. As a result, the ammonia nitrogen...

Claims

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Application Information

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IPC IPC(8): C22B3/08C22B3/10C22B3/44C22B59/00
CPCC22B3/08C22B3/10C22B3/44C22B59/00Y02P10/20
Inventor 冯宗玉黄小卫赵龙胜范波尹海峰刘德鹏尹伟强齐少雷
Owner GRIREM ADVANCED MATERIALS CO LTD
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