Method for preparing iron-based low-temperature denitration catalyst from ilmenite

A low-temperature denitrification and catalyst technology, applied in chemical instruments and methods, physical/chemical process catalysts, separation methods, etc., can solve the problems of unrealized high-value utilization of ilmenite catalysts, improve anti-poisoning performance and reduce production The effect of low cost and energy consumption

Active Publication Date: 2020-11-27
JIANGSU LONGKING COALOGIX CATALYST REGENERATION CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the above methods are all enriching ilmenite to achieve high-efficiency extraction of titanium, but have not realized the high-value utilization of ilmenite to prepare catalysts

Method used

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  • Method for preparing iron-based low-temperature denitration catalyst from ilmenite

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Embodiment example 1

[0026] A method for preparing an iron-based low-temperature denitrification catalyst using ilmenite, adjusting the composition to FeO x 5%, TiO 2 80%, other SiO 2 、Al 2 o 3 The ilmenite is crushed and finely ground, passed through a 200-mesh sieve, and the fine ore powder under the sieve is taken; adding a sulfuric acid solution with a Fe element content of 110%, and aging for 24 hours after stirring; adjust the pH value to 3, The temperature is 120°C, and the temperature is kept for 6 hours; the molding aid is added for mixing for 3 hours, aged for 36 hours, and finally the honeycomb catalyst wet billet is extruded, dried at 60°C, and finally calcined at 300°C for 48 hours, and the heating rate is 1°C / min. Iron-based low-temperature denitrification catalyst.

Embodiment example 2

[0028] A method for preparing an iron-based low-temperature denitration catalyst using ilmenite, adjusting the composition to FeO x 10%, TiO 2 85%, other SiO 2 、Al 2 o 3 5%; crush and finely grind the ilmenite, pass through a 230-mesh sieve, and take the fine ore powder under the sieve; add nitric acid solution with 100% Fe element content, stir well and age for 20 hours; adjust the pH value to 4, The temperature was 100°C, and the temperature was kept for 9 hours; the molding aid was added to knead for 4 hours, aged for 30 hours, and finally made into a granular catalyst wet billet, which was dried at 80°C, and finally calcined at 350°C for 36 hours, and the heating rate was 3°C / min. Iron-based low-temperature denitrification catalyst.

Embodiment example 3

[0030] A method for preparing an iron-based low-temperature denitration catalyst using ilmenite, adjusting the composition to FeO x 15%, TiO 2 73%, other SiO 2 、Al 2 o 3 12%; crush and finely grind the ilmenite, pass through a 250-mesh sieve, and take the fine ore powder under the sieve; add sulfuric acid and nitric acid mixed solution with 90% Fe element content, stir well and age for 16 hours; adjust the pH value To 5, the temperature is 80°C, keep warm for 12h; add molding aids and knead for 5h, age for 24h, finally prepare the corrugated plate catalyst wet billet, dry at 100°C, and finally roast at 400°C for 24h, the heating rate is 5°C / min , to obtain an iron-based low-temperature denitration catalyst.

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Abstract

The invention belongs to the field of industrial flue gas denitration, and relates to a method for preparing an iron-based low-temperature denitration catalyst from ilmenite. The method sequentially comprises the steps of component design, grinding, screening, acid etching, crystallization, mulling, forming, drying and roasting. The iron-based low-temperature denitration catalyst is obtained by mixing ilmenite of different grades for component design, grinding and screening the ilmenite mixed after component design, eroding the surfaces of minerals through strong acid, controlling crystallization, then adding a forming aid for mixing and forming, and finally performing drying and roasting. According to the method, high-value utilization of the ilmenite is achieved, the production cost of the denitration catalyst is reduced. The method has important economic value and environmental benefits.

Description

technical field [0001] The invention belongs to the field of industrial flue gas denitrification, and in particular relates to a method for preparing an iron-based low-temperature denitrification catalyst by using ilmenite. Background technique [0002] The denitrification catalyst is selective catalytic reduction (SCR) to achieve industrial flue gas NO x Ultra-low emission core. Studies have shown that iron oxides have good low-temperature denitration activity. However, the existing iron-based low-temperature denitration catalysts are mainly prepared by using pure iron oxides or loading iron oxides on high-purity titanium dioxide, and the cost is high. [0003] Ilmenite is a natural mineral, an oxide mineral of titanium and iron, and the main phase is TiFeO 3 , is to extract TiO 2 main minerals. Ilmenite from different origins has certain compositional differences. Generally, the content of Ti and Fe is more than 20%, and some elements such as Si and Al are contained. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/745B01D53/86B01D53/56
CPCB01D53/8628B01D2258/0283B01J23/745
Inventor 张柏林张深根
Owner JIANGSU LONGKING COALOGIX CATALYST REGENERATION CO LTD
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