Process for leaching rare earth from ion-adsorption type rare earth ore without using ammonium salt

An ion adsorption type, rare earth ore technology, applied in the direction of process efficiency improvement, etc., can solve the problems of ammonium ion loss, ammonia nitrogen exceeding the standard, environmental pollution around the mine, etc., and achieve the effect of solving ammonia nitrogen pollution, large economic benefits and social benefits

Inactive Publication Date: 2013-12-11
LONGNAN COUNTY NANYU RARE EARTH RESOURCES COMPREHENSIVE UTILIZATION CO LTD
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  • Abstract
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  • Application Information

AI Technical Summary

Problems solved by technology

However, for a long time, the process of using ammonium sulfate as the leaching agent and ammonium bicarbonate as the precipitating agent has lost a large amount of ammonium ions no matter in the mine mining or in the ore body after the rare earth mining, causing the surrounding environment of the mine to be polluted and the water body to be polluted. Ammonia nitrogen seriously exceeds the standard (ammonia nitrogen content in mining wastewater is 100-400mg / L), so far it cannot be treated up to the standard, leaving long-term environmental pollution problems

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] Embodiment 1 (soaking method)

[0016] Taking 500 grams of ionic rare earth raw ore as an example, the specific steps are as follows:

[0017] 1. Determination of raw ore rare earth grade: Take 500 grams of ionic rare earth raw ore, pre-determined that the rare earth grade in the raw ore is 0.4‰, and calculate the rare earth in 500 grams of ore to be 0.2 grams;

[0018] 2. Determine the ratio of compound salt: according to the ratio of solid calcium salt: magnesium salt: sodium salt = 5:4:1;

[0019] 3. Calculate and weigh the compound salt: Calculate the required amount of compound salt as 2 grams according to the mass ratio of rare earth: compound salt (solid) = 1:10, and prepare 800ml of compound calcium, magnesium and sodium with a concentration of 2.5% saline solution;

[0020] 4. Extraction of raw ore rare earth leaching: put 500 grams of rare earth into a beaker, add 800ml of prepared compound salt solution into it, soak for 4 hours, filter, take liquid and fil...

Embodiment 2

[0025] Embodiment 2 (washing method)

[0026] Taking 500 grams of ionic rare earth raw ore as an example to leach rare earths with a compound solution of calcium, magnesium and sodium salts, the specific steps are:

[0027] 1. Determination of raw ore rare earth grade: Take 500 grams of ionic rare earth ore, pre-determined that the rare earth grade in the raw ore is 0.4‰, and calculate the rare earth content in 500 grams of ore to be 0.2 grams;

[0028] 2. Determine the ratio of compound salt: According to the ratio of solid calcium salt: magnesium salt: sodium salt = 4.5: 4.5: 1;

[0029] 3. Calculation and weighing of compound salt: According to the mass ratio of rare earth: calcium chloride or magnesium chloride = 1:10, the required amount of compound salt is calculated to be 2 grams, and calculated and weighed according to the determined ratio of calcium, magnesium, and sodium salts for preparation into 800 ml of 2.5% compound salt solution;

[0030] 4. Rare earth leach...

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PUM

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Abstract

The invention relates to a process for leaching rare earth from ion-adsorption type rare earth ore without using ammonium salt. The process comprises the step of replacing ammonium salt by taking a mixture of calcium, magnesium and sodium salts as a leaching agent and taking non-ammonium salts, such as calcium hydroxide, magnesium hydrate or sodium hydroxide as a precipitator. According to the process disclosed by the invention, the ammonia nitrogen pollution problem in exploitation of ion-adsorption type rare earth is radically solved; environmental-friendly exploitation of the ion-adsorption type rare earth can be realized; the process disclosed by the invention has higher economic benefit and social benefit.

Description

technical field [0001] The invention relates to a process for leaching rare earths from non-ammonium salts of ion-adsorption rare earth ores. Background technique [0002] The mining of ion-adsorption rare earth mines in my country has a history of several decades. At the beginning of mining, the pool leaching process of sodium chloride was used as the leaching agent. Later, because sodium chloride would make the soil salinized, it was changed to ammonium sulfate. The leaching agent forms a mining process for ion-absorbing rare earths with ammonium sulfate as the leaching agent and ammonium bicarbonate as the precipitating agent, and gradually develops from the pool leaching process to an in-situ leaching process that protects the ecology. However, for a long time, the process of using ammonium sulfate as the leaching agent and ammonium bicarbonate as the precipitating agent has lost a large amount of ammonium ions no matter during mining or in the ore body after mining rare ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B59/00C22B3/04C22B3/44
CPCY02P10/20
Inventor 许瑞高钟化云李早发
Owner LONGNAN COUNTY NANYU RARE EARTH RESOURCES COMPREHENSIVE UTILIZATION CO LTD
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