Method for preparing SCR denitration catalyst by using rare earth tailings

A technology for denitrification catalysts and rare earth tailings, applied in chemical instruments and methods, physical/chemical process catalysts, separation methods, etc., can solve the problems of tailings miscellaneous and underutilized, etc., to increase the specific surface area and save resources , Improve the effect of catalytic activity

Active Publication Date: 2022-04-26
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 by using rare earth tailings
  • Method for preparing SCR denitration catalyst by using rare earth tailings
  • Method for preparing SCR denitration catalyst by using 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 denitrification catalyst by using rare earth tailings. The catalyst carrier is formed by element dissolution and recombination and ore phase pore creation, and the tailings are processed and rare earth on the basis of retaining the original ore phase of rare earth tailings. Prepare the SCR denitrification catalyst by loading elements; ball mill the rare earth tailings to reach a certain particle size, use acetic acid leaching, HF acid leaching and NaOH and tailings to roast according to a certain ratio, and the eluate contains Ce, La, Concentrates such as Fe, Mn, etc., simultaneously obtain the carrier of acid-base treatment tailings; then use rare earth nitrate and acid-soluble rare earth tailings solution concentrate to load on the surface of the treated rare earth tailings to prepare SCR with rare earth tailings as the carrier denitrification catalyst. The method of the invention provides a method for preparing the SCR denitrification catalyst using the rare earth tailings as a carrier from the rare earth tailings, so that multiple components of the rare earth tailings can be reused, which 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 Patents(China)
IPC IPC(8): B01J23/889B01J35/10B01D53/86B01D53/56
CPCB01J23/8892B01J35/1004B01D53/565B01D53/8628
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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