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Preparation method of low-temperature SCR denitration catalyst based on wolframite smelting slag

A technology of denitrification catalyst and wolframite, which is applied in chemical instruments and methods, heterogeneous catalyst chemical elements, physical/chemical process catalysts, etc., can solve the problems of high production cost of denitrification catalyst, high denitrification catalyst, complex process, etc. problems, to achieve high value-added resource utilization, excellent denitrification performance, and good catalytic performance

Active Publication Date: 2021-01-26
ANHUI YUANCHEN ENVIRONMENTAL PROTECTION SCI & TECH
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  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] Chinese patent CN103537279A discloses a low-temperature denitrification catalyst with additives and its preparation method, using TiO2-SiO2 is the carrier, manganese oxide is the active substance, cerium oxide, nickel oxide and iron oxide are additives, the added active substances and additives need to be purchased, which will make the denitrification catalyst higher, and the prepared Mn-Fe- The denitrification rate of Ce / Ti-Si catalyst K is only 46% at 180°C after K poisoning, and the denitrification rate is low
Chinese patent CN108479794A discloses a corrugated denitration catalyst suitable for low-temperature flue gas and its preparation method. The catalyst is supported by one or more of titanium oxide, magnesium oxide, zirconium oxide, calcium oxide and barium oxide. Transition metal oxides are additives, and transition metals are one or more mixtures of lead oxide, cerium oxide, antimony oxide, iron oxide, manganese oxide, and cobalt oxide. On the one hand, transition metal oxide additives need to be purchased, and denitrification The cost of catalyst production is high, and the denitration rate of the prepared denitration catalyst is not mentioned
Chinese patent CN103614545A discloses a method for processing low-grade tungsten concentrate and tungsten slag. The process of processing tungsten concentrate and tungsten slag is complicated, the production cost is high, and it is impossible to realize high value-added resources of wolframite smelting slag. utilization

Method used

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  • Preparation method of low-temperature SCR denitration catalyst based on wolframite smelting slag
  • Preparation method of low-temperature SCR denitration catalyst based on wolframite smelting slag

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Embodiment 1

[0030] A method for preparing a low-temperature SCR denitration catalyst based on wolframite smelting slag, comprising the following steps:

[0031] (1) washing wolframite concentrate smelting slag with water to make it neutral, drying at 100°C for 12 hours to obtain dry material, grinding, and sieving through a 300-mesh sieve;

[0032] (2) Take 20 g of wolframite smelting slag powder obtained in step (1) and add it to 100 g of hydrochloric acid solution with a concentration of 25%, add 10 g of reducing agent sucrose, react and stir at 50 ° C for leaching for 4 hours, and filter to obtain supermanganese-rich , Fe filtrate A and silicon-aluminum-rich filter residue, iron oxide and manganese oxide contents in the leachate, and silicon-aluminum content in the leaching slag are shown in Table 1.

[0033] (3) Get 48g of the filtrate A prepared in step (2), add 1.6g of concentrated sulfuric acid dropwise to it, remove Ca 2+ , filtered to obtain filtrate B;

[0034] (4) Add ammonia...

Embodiment 2

[0038] A method for preparing a low-temperature SCR denitration catalyst based on wolframite smelting slag, comprising the following steps:

[0039] (1) washing wolframite concentrate smelting slag with water to make it neutral, drying at 100°C for 12 hours, grinding the dried material, and sieving through a 300-mesh sieve;

[0040] (2) Take 20g of wolframite smelting slag powder obtained in step (1) and add it to 100g of hydrochloric acid solution with a concentration of 25%, add 10g of reducing agent sucrose, react and stir at 30°C for leaching for 6h, and filter to obtain supermanganese-rich , Fe filtrate A and silicon-aluminum-rich filter residue, iron oxide and manganese oxide contents in the leachate, and silicon-aluminum content in the leaching slag are shown in Table 1.

[0041] (3) Get 48g of the filtrate A prepared in step (2), add 1.6g of concentrated sulfuric acid dropwise to it, remove Ca 2+ , filtered to obtain filtrate B;

[0042] (4) Add ammonia water to the ...

Embodiment 3

[0046] A method for preparing a low-temperature SCR denitration catalyst based on wolframite smelting slag, comprising the following steps:

[0047] (1) washing wolframite concentrate smelting slag with water to make it neutral, drying at 100°C for 12 hours to obtain dry material, grinding, and sieving through a 300-mesh sieve;

[0048] (2) Take 20g of wolframite smelting slag powder obtained in step (1) and add it to 100g of hydrochloric acid solution with a concentration of 25%, add 8g of reducing agent sucrose, react and stir at 50°C for leaching for 6h, and filter to obtain supermanganese-rich , Fe filtrate A and silicon-aluminum-rich filter residue, iron oxide and manganese oxide contents in the leachate, and silicon-aluminum content in the leaching slag are shown in Table 1.

[0049] (3) Get 48g of the filtrate A prepared in step (2), add 1.6g of concentrated sulfuric acid dropwise to it, remove Ca 2+ , filtered to obtain filtrate B;

[0050] (4) Add ammonia water to t...

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Abstract

The invention discloses a preparation method of a low-temperature SCR denitration catalyst based on wolframite smelting slag, relates to the field of environment-friendly catalytic materials, and aimsat solving the problems that the existing SCR denitration catalyst is high in production cost, the tungsten concentrate and tungsten slag treatment process is complex, the treatment cost is high, andhigh-added-value resource utilization of the wolframite smelting slag cannot be realized. The method has the advantages that the SCR denitration catalyst is prepared by taking the waste wolframite smelting slag as the raw material, and based on the efficient denitration performance of manganese oxide and ferric oxide and the characteristic that the wolframite smelting slag is rich in manganese oxide and ferric oxide, the wolframite smelting slag is treated, and then the titanium dioxide carrier is added, the preparation and the synthesis of the denitration catalyst are realized, and high-added-value resource utilization of hazardous wastes is realized. Meanwhile, the prepared SCR denitration catalyst is good in catalytic performance, the removal rate of nitric oxide can reach 95 percent or above, and the denitration performance is excellent.

Description

technical field [0001] The invention relates to the field of environment-friendly catalytic materials, in particular to a method for preparing a low-temperature SCR denitrification catalyst based on wolframite smelting slag. Background technique [0002] my country has the most abundant tungsten-manganese ore in the world. The original ore is mined, selected and purified to obtain tungsten-manganese ferromanganese concentrate. After the tungsten concentrate is extracted by alkaline leaching, a large amount of alkali-containing tungsten slag is left. Because there is no economical and effective way to use these slags, they are stored for a long time, which not only occupies a large amount of land, but also causes serious pollution and harm to the water system and soil, and the valuable substances such as manganese and iron cannot be effectively used, causing serious waste of resources. [0003] NOx can cause photochemical smog, greenhouse effect and damage to the ozone layer...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/889B01D53/86B01D53/56
CPCB01J23/002B01J23/8892B01D53/8628B01J2523/00B01D2251/2062B01J2523/31B01J2523/41B01J2523/47B01J2523/72B01J2523/842
Inventor 潘有春徐奎王光应赵羽
Owner ANHUI YUANCHEN ENVIRONMENTAL PROTECTION SCI & TECH
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