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Method for preparing SCR denitration catalyst from rare earth tailings

A denitration catalyst and rare earth tailings technology, applied in chemical instruments and methods, physical/chemical process catalysts, separation methods, etc., can solve the problems of underutilization and miscellaneous tailings, and achieve low cost and improved treatment efficiency. , the effect of convenient operation

Active Publication Date: 2019-07-19
INNER MONGOLIA UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

After extracting iron and some niobium in Baiyan Obo Mine, the remaining tailings have not been fully utilized due to "poor, fine, miscellaneous" and technical reasons

Method used

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  • Method for preparing SCR denitration catalyst from rare earth tailings
  • Method for preparing SCR denitration catalyst from rare earth tailings
  • Method for preparing SCR denitration catalyst from rare earth tailings

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] Put the rare earth tailings into a ball mill for ball milling, screen 300-400 mesh particle size and pack; weigh 500g of rare earth tailings and acetic acid and citric acid (the molar concentration of acetic acid is 8mol / L, and the molar concentration of citric acid is 4mol / L ) mixed acid, the liquid-solid ratio is 1:2, the immersion time is 2h, and then washed with water to obtain the acetic acid leaching tailings and solution A, and the acetic acid leaching tailings are dried.

[0036] Acetic acid leaching tailings and HF acid (the molar concentration of HF acid is 4mol / L) are mixed, the liquid-solid ratio is 1:1, the immersion time is 1.5h, and then washed and filtered to obtain HF acid leaching tailings and solution B, Dry HF acid leaching tailings.

[0037] Mix the dried HF acid leaching tailings with NaOH solution (the mass concentration of NaOH solution is 8%), let it stand for 1.5h, wash and filter with water, and obtain acid-base treatment tailings and solution...

Embodiment 2

[0043] Put the rare earth tailings into a ball mill for ball milling, screen 300-400 mesh particle size and pack; weigh 500g of rare earth tailings and acetic acid and citric acid (the molar concentration of acetic acid is 10mol / L, and the molar concentration of citric acid is 3mol / L ) mixed with an equal volume of mixed acid, the liquid-solid ratio is 1:1, the immersion time is 2h, and then washed with water to obtain the acetic acid leaching tailings and solution A, and the acetic acid leaching tailings are dried.

[0044] Mix acetic acid leaching tailings and HF acid (the molar concentration of HF acid is 2mol / L), the liquid-solid ratio is 1:2, the immersion time is 2h, and then wash and filter with water to obtain HF acid leaching tailings and solution B, and dry Dry HF acid leaching tailings.

[0045] Mix the dried HF acid leaching tailings with NaOH solution (the mass concentration of NaOH solution is 11%), the liquid-solid ratio is 1:2, the standing time is 15min, wash ...

Embodiment 3

[0051] Put the rare earth tailings into a ball mill for ball milling, screen 300-400 mesh particle size and pack; weigh 500g of rare earth tailings, acetic acid and citric acid (the molar concentration of acetic acid is 5mol / L, and the molar concentration of citric acid is 1.5mol / L L) is mixed with the mixed acid, the liquid-solid ratio is 1:3, the immersion time is 2h, and then washed with water to obtain the acetic acid leaching tailings and solution A, and the acetic acid leaching tailings are dried.

[0052] Mix acetic acid leaching tailings and HF acid (the molar concentration of HF acid is 2mol / L), the liquid-solid ratio is 1:3, the immersion time is 3h, and then wash and filter with water to obtain HF acid leaching tailings and solution B, and dry Dry HF acid leaching tailings.

[0053] Mix the dried HF acid leaching tailings with NaOH solution (the mass concentration of NaOH solution is 15%), let it stand for 1.5h, wash and filter with water, and obtain acid-base treat...

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Abstract

The invention discloses a method for preparing an SCR (Selective Catalytic Reduction) denitration catalyst by utilizing rare earth tailings. According to the method, a catalyst carrier is formed by utilizing element dissolution rerecombination and mineral phase pore forming, and processing treatment and rare earth element loading are carried out on tailings on the basis of reserving a raw mineralphase of the rare earth tailings, so that the SCR denitration catalyst is prepared. Specifically, the method comprises the following steps: carrying out ball milling on rare earth tailings to a certain particle size, using methods of acetic acid leaching, HF acid leaching, and conducting roasting on NaOH and tailings according to a certain proportion to obtain a leachate containing concentrated substances such as Ce, La, Fe and Mn and a carrier of the tailings subjected to acid and base treatment; and then loading a rare earth nitrate and an acid-soluble rare earth tailing solution concentrated solution to the surface of the treated rare earth tailings to prepare the SCR denitration catalyst taking the rare earth tailings as a carrier. According to the method for preparing the SCR denitration catalyst with the rare earth tailings as the carrier from the rare earth tailings, multiple components of the rare earth tailings are recycled, and the method is more environmentally friendly.

Description

technical field [0001] The invention relates to a method for preparing an SCR denitrification catalyst by utilizing rare earth tailings, and belongs to the field of low-temperature SCR catalytic denitrification. Background technique [0002] my country's rare earth reserves account for 23% of the world's total, ranking first in the world. The Baotou Baiyun Obo Mine accounts for 83% of my country's rare earth reserves. It is rich in iron, rare earth and niobium symbiotic deposits. The rare earth is rich in light rare earth elements such as La, Ce, Sm and Eu. It is known as the "rare earth capital" in the world. The ore material composition of the Baiyan Obo deposit is extremely complex. According to the existing analysis and test results, the rare earth elements in the ore are dominated by the cerium group, and the proportion of lanthanum, cerium, praseodymium, neodymium, and samarium rare earths is 97%, of which CeO 2 42%. Baotou Baiyun Obo deposit is a complex deposit. If...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/889B01J35/10B01D53/86B01D53/56
CPCB01J23/8892B01D53/565B01D53/8628B01J35/61
Inventor 张凯武文斐金光李娜罗慧娟赵增武李保卫
Owner INNER MONGOLIA UNIV OF SCI & TECH
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