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Removal of target materials using rare earth metals

A target material, rare earth technology, applied in the field of stabilization to achieve the effect of increasing flexibility

Inactive Publication Date: 2011-12-07
MOLYCORP MINERALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Most techniques for removal of noxious metals are hampered by difficulties in removing many of these metals

Method used

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  • Removal of target materials using rare earth metals
  • Removal of target materials using rare earth metals
  • Removal of target materials using rare earth metals

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0147] A set of experiments was conducted to determine the soluble cerium(III) chloride CeCl in the arsenic-containing stream 108 to reduce the arsenic concentration to less than 50 ppm 3 The maximum arsenic loading capacity. As shown in Table 1, the tested arsenic-containing stream 108 (hereinafter alkaline leach solution) had the following composition:

[0148] Table 1

[0149]

[0150] The initial pH of the seven alkaline leaching solutions was about pH 11, the temperature of the solutions was about 70-80° C., and the reaction time was about 30 minutes.

[0151] Seven alkaline leach solutions were made with different arsenic(V) concentrations as can be seen in Table 1 above. Each solution contained the same amount of sodium carbonate (20 g / L) and sodium sulfate (17.75 g / L). In the first series of experiments, 3.44 mL of cerium chloride (CeCl 3 ) is added to each isotherm and is equal to 0.918g CeO 2 (approximately 0.05 mol Ce). In the second series of experiments, ...

Embodiment 2

[0160] In another experiment, 40 grams of cerium(IV) oxide particles were loaded into a 1 inch column, resulting in a bed volume of approximately 50 ml. The ceria bed passed an arsenic-containing process stream [75% As(V), 25% As(III)] through the bed and successfully loaded the media with about 44 mg As / gram CeO 2 Or about 1,700 mg of the total amount of arsenic added to the column. Afterwards, an arsenic-supported ceria bed was passed through the bed at a flow rate of 2 mL / min for 6 bed volumes of the equivalent of a 5% NaOH solution. The solution released the 44mg As / g CeO 2 about 80% of that. Subsequently, the same cerium media was then treated again with an arsenic-contaminated process stream [75% As(V), 25% As(III)] to load the media with an additional 25 mg As / g CeO 2or another 1,000mg of arsenic. This experiment shows how to regenerate an insoluble fixative and thus extend its life, and shows that the pH of the arsenic-containing solution can be important in determ...

Embodiment 3

[0162] Trials were conducted to remove residual rare earth fixatives from alkaline leach solutions.

[0163] 15 grams of table salt (NaCl) was added to 150 mL of the alkaline leach solution containing residual cerium from the cerium nitrate addition. Table 6 shows the starting (control) and post-salt concentrations in the alkaline leach solution:

[0164] table 3

[0165] sample

[0166] As can be seen from this Table 3, 94% of the residual cerium has been removed.

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Abstract

The present invention relates to the removal of one or more selected target materials from various streams using rare earth metal-containing fixatives.

Description

[0001] Cross References to Related Applications [0002] This application claims U.S. Provisional Application Serial No. 61 / 113,435, filed November 11, 2008, entitled "Arsenic Removal Using Rare Earth Metals"; U.S. Provisional Application Serial No. 61 / 179,622; U.S. Provisional Application Serial No. 61 / 186,258, filed June 11, 2009, entitled "Arsenic Removal Using Rare Earth Metals"; filed June 12, 2009, entitled "Arsenic Removal U.S. Provisional Application Serial No. 61 / 186,662, "Using Rare Earth Metals"; U.S. Provisional Application Serial No. 61 / 223,222, filed July 6, 2009, entitled "Arsenic Removal Using Rare Earth Metals"; filed July 7, 2009 U.S. Provisional Application Serial No. 61 / 223,608, entitled "Arsenic Removal Using Rare Earth Metals"; U.S. Provisional Application Serial No. 61 / 240,867, filed September 9, 2009, entitled "Arsenic Removal Using Rare Earth Metals"; 2009 U.S. Provisional Application Serial No. 61 / 224,3 16, filed July 9, 2009, entitled "Removal of Solu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F5/02C02F1/42
Inventor 约翰.伯巴卡尔.哈斯勒查尔斯.怀特海德约瑟夫.卢波布洛克.C.奥凯利罗伯特.卡布尔约瑟夫.帕斯科布兰特.赖特
Owner MOLYCORP MINERALS
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