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Modified diatomite and preparation method thereof

A diatomite modification technology, applied in the field of modified diatomite and its preparation, can solve the problems of MoO3 volatility and high product toxicity, lack of mercury oxidation ability, low oxidation ability, etc., to improve mechanical strength and Erosion resistance, specific surface area improvement, and oxidation ability improvement effect

Inactive Publication Date: 2015-03-18
SHANGHAI LANGT ELECTRIC POWER ENVIRONMENTAL PROTECTION TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0009] In order to solve the defect that the denitrification catalyst mercury does not have the oxidation ability or the oxidation ability is low and the life is short, and there is still a small amount of MoO 3 Volatility and high product toxicity defects, the present invention firstly provides a modified diatomite, which is prepared through the following steps:

Method used

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  • Modified diatomite and preparation method thereof

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Effect test

Embodiment 1

[0050] Preparation of Modified Diatomite

[0051] The commercially available diatomite is modified once with a nitric acid solution of PH=0.1, and the pre-modified diatomite is obtained by boiling, cooling, suction filtration, washing, drying, roasting, etc., and the diatomite is added to the nitric acid solution , configured into a slurry with a concentration of 50% by weight, and obtained pre-modified diatomite by boiling, cooling, suction filtration, washing, drying, and roasting. at 500°C, and the calcination time is 16h. After the calcination, the required pre-modified diatomite is obtained; the pre-modified diatomite is modified twice with ferric nitrate with a concentration of 20% by weight, and the pre-modified diatomite is The diatomite is added into the ferric nitrate solution to prepare a slurry with a mass concentration of 40%. After drying and roasting, the secondary modified diatomite is obtained. The drying temperature is 100°C, dried for 16 hours, and the calci...

Embodiment 2

[0070] Preparation of Modified Diatomite

[0071] The commercially available diatomite is modified once with a nitric acid solution of PH=0.06, and the pre-modified diatomite is obtained by boiling, cooling, suction filtration, washing, drying, roasting, etc., and the diatomite is added to the nitric acid solution , configured into a slurry with a mass concentration of 40%, and obtained pre-modified diatomite by boiling, cooling, suction filtration, washing, drying, and roasting. The boiling temperature is 85°C, the drying temperature is 95°C, and the drying temperature is 14 hours. 450°C, the calcination time is 14h, after the calcination, the required pre-modified diatomite is obtained; the pre-modified diatomite is modified twice with the mass ratio of 25% ferric nitrate, and the pre-modified silicon The diatomite is added to the ferric nitrate solution to form a slurry with a mass concentration of 40%, and then the secondary modified diatomite is obtained by drying and roa...

Embodiment 3

[0090] Preparation of Modified Diatomite

[0091] The commercially available diatomite is modified once with a nitric acid solution of PH=0.2, and the pre-modified diatomite is obtained by boiling, cooling, suction filtration, washing, drying, roasting, etc., and the diatomite is added to the nitric acid solution , configured into a slurry with a mass concentration of 45%, and obtained pre-modified diatomite by boiling, cooling, suction filtration, washing, drying, and roasting. The boiling temperature is 85°C, the drying temperature is 95°C, and the drying temperature is 13 hours. 485°C, the calcination time is 13h, and after the calcination, the required pre-modified diatomite is obtained; the pre-modified diatomite is modified twice with ferric nitrate with a mass ratio of 26%, and the pre-modified silicon The diatomaceous earth is added to the ferric nitrate solution to prepare a slurry with a mass concentration of 45%. After drying and roasting, the secondary modified dia...

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Abstract

The present invention provides a modified diatomite and a preparation method thereof. The modified diatomite preparation steps comprise: pre-modifying diatomite with a nitric acid solution, carrying out secondary modification on the pre-modified diatomite with a ferric nitrate solution, and carrying out air flow dispersion mixing on a perovskite substance and the obtained diatomite to obtain the finally-modified diatomite. According to the present invention, the specific surface area of the modified diatomite is substantially improved.

Description

technical field [0001] The invention relates to the field of environmental protection, in particular to a modified diatomite and a preparation method thereof. Background technique [0002] my country is a major coal-producing country in the world, with coal output accounting for 37% of the world’s total. It is also a major coal-burning country. Coal is the main source of energy consumption, and the proportion of coal in the energy structure is as high as 75%. The pollutants SOx and NOx produced by coal combustion have long been attracted widespread attention. Nowadays, the pollution of trace elements (such as Hg, Pb, As, Se, etc.) caused by coal burning is also attracting people's attention, especially the mercury pollution caused by coal burning. Worldwide, mercury emissions due to human activities account for 10% to 30% of the total mercury emissions. Mercury is a trace element in coal. During the coal combustion process, most of it is discharged into the atmosphere with ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/881B01D53/86B01D53/56B01D53/64
Inventor 张现龙姜瑞霞焦雪静张蓓周坚刚
Owner SHANGHAI LANGT ELECTRIC POWER ENVIRONMENTAL PROTECTION TECH
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