CN-121972165-A - Kiln slag-based Fe2O3Preparation method and application of/C catalytic material

Abstract

The invention discloses a preparation method and application of a kiln slag-based Fe 2 O 3 /C catalytic material, and relates to the technical field of industrial solid waste recycling and fluorine-containing greenhouse gas treatment, comprising the following steps of pretreating zinc smelting rotary kiln slag, placing the pretreated kiln slag into a muffle furnace, heating to 900-1500 ℃, preserving heat, and naturally cooling to room temperature; the invention takes industrial solid waste kiln slag as a raw material, does not add other active components, builds a composite structure of Fe 2 O 3 and carbon in situ through high-temperature calcination and ball milling process, and the obtained catalytic material can efficiently catalyze and degrade sulfur hexafluoride in air atmosphere, thereby realizing waste treatment with waste.

Inventors

• WANG FANG
• DONG BOXU
• LI ZHIQIANG
• ZHANG XINZHEN
• ZAI JIANTAO
• XIAO ZHIPENG
• ZHANG SHUNPING

Assignees

• 河套学院
• 上海交通大学内蒙古研究院

Dates

Publication Date

20260505

Application Date

20260317

Claims (10)

1. 1. The preparation method of the kiln slag-based Fe 2 O 3 /C catalytic material is characterized by comprising the following steps of: (1) Pretreating the kiln slag of the zinc smelting rotary kiln to obtain kiln slag raw materials with uniform granularity; (2) Calcining the kiln slag pretreated in the step (1) for 1-4 hours at 900-1500 ℃ in air or weak oxidizing atmosphere, and then cooling; (3) Ball milling, namely ball milling the kiln slag cooled in the step (2) to obtain powdery kiln slag-based Fe 2 O 3 /C catalytic material.
2. 2. The method for preparing the kiln slag-based Fe 2 O 3 /C catalytic material according to claim 1, wherein in the step (1), the kiln slag contains the following components in percentage by mass, fe is more than or equal to 30%, ca is less than or equal to 10%, si is less than or equal to 5%, zn is less than or equal to 5%, C is more than or equal to 15%, and the total content of impurities is less than or equal to 10%.
3. 3. The method for preparing the kiln slag-based Fe 2 O 3 /C catalytic material according to claim 1, wherein in the step (1), the pretreatment comprises crushing and screening, the crushing is to crush kiln slag until the grain size is less than or equal to 10mm, and the screening is to pass the crushed material through a 10-50 mesh screen to obtain kiln slag raw material with uniform grain size.
4. 4. The method for preparing the kiln slag-based Fe 2 O 3 /C catalytic material according to claim 1, wherein in the step (2), the calcination is performed under an air atmosphere.
5. 5. The method for preparing the kiln slag-based Fe 2 O 3 /C catalytic material according to claim 1, wherein in the step (2), the calcining temperature is 1500 ℃, the time is 2 hours, and the heating rate is 15 ℃ min -1 .
6. 6. The method for preparing the kiln slag-based Fe 2 O 3 /C catalytic material according to claim 1, wherein in the step (3), ball milling is carried out in a ball mill, agate balls are adopted as grinding media, the ball-material ratio is 5-15:1, the rotating speed is 100-300 rpm, and the time is 15-60 minutes.
7. 7. The method for preparing the kiln slag-based Fe 2 O 3 /C catalytic material according to claim 6, wherein the ball milling is carried out at a ball-to-material ratio of 10:1 and a rotating speed of 200 rpm for 30 minutes.
8. 8. The method for preparing the kiln slag-based Fe 2 O 3 /C catalytic material, which is disclosed in claim 1, is characterized in that the prepared powdery kiln slag-based Fe 2 O 3 /C catalytic material is mixed with metal Ag powder in proportion, and then ball milling treatment is carried out, so that the kiln slag-based Fe 2 O 3 /C catalytic material loaded with Ag is obtained, wherein the loading amount of the Ag is 1-wt% -10 wt% based on the total mass of the mixed material.
9. 9. The application of the kiln slag-based Fe 2 O 3 /C catalytic material prepared according to any one of claims 1-8 in sulfur hexafluoride catalytic degradation is characterized in that the kiln slag-based Fe 2 O 3 /C catalytic material is used as a catalyst to carry out catalytic degradation on sulfur hexafluoride under normal pressure and air atmosphere.
10. 10. The use of a kiln slag based Fe 2 O 3 /C catalytic material in the catalytic degradation of sulphur hexafluoride according to claim 9, characterised by the steps of: (1) Introducing sulfur hexafluoride mixed gas into a reactor filled with kiln slag-based Fe 2 O 3 /C catalytic material, wherein the mixed gas consists of sulfur hexafluoride and air, and the volume concentration of the sulfur hexafluoride is 5% -20%; (2) Heating the reactor to 400-600 ℃ to perform catalytic degradation reaction; (3) And (3) treating the tail gas treated in the step (2) by alkali solution.

Description

Preparation method and application of kiln slag-based Fe 2O3/C catalytic material Technical Field The invention relates to the technical field of materials, in particular to a method for preparing Fe 2O3/C composite catalytic material by taking kiln slag of a zinc smelting rotary kiln as a raw material and application of the Fe 2O3/C composite catalytic material in catalytic degradation of strong greenhouse gas sulfur hexafluoride (SF 6) in air atmosphere. Background Global climate change has become a serious challenge for humans, and the abatement of powerful greenhouse gases is critical to address this challenge. Sulfur hexafluoride (SF 6) is widely applied to ultra-high voltage power transmission and transformation equipment and electrical switches due to excellent electrical insulation performance and arc extinguishing capability, and is an indispensable key medium in the power industry. However, SF 6 has a global warming potential (Global Warming Potential, GWP) as high as 24300 times that of CO 2, and can exist stably in the atmosphere for hundreds to thousands of years, which is one of the strong greenhouse gases known at present. The regional difference of the energy distribution in China determines the necessity of ultra-high voltage and ultra-long distance transmission, so that the usage amount of SF 6 in the power system in China continuously rises. According to investigation, in 2020, the SF 6 of China has been used in an amount exceeding one hundred thousand tons and is increased at a rate of more than 20% per year, and the emission of a large amount of SF 6 of China has become an important obstacle for realizing the 'double carbon' target of China. Therefore, developing an efficient, economical and large-scale SF 6 degradation technology has become a key topic to be solved in the environmental protection and power industries. The existing sulfur hexafluoride degradation method comprises various methods such as adsorption, traditional industrial thermal decomposition, photodegradation, plasma method, catalytic degradation and the like, wherein the catalytic degradation method can convert sulfur hexafluoride into harmless or easily-treated substances under relatively mild conditions, and the sulfur hexafluoride degradation method is a promising terminal treatment technology. The core of the technology is to design a bifunctional catalyst capable of realizing sulfur hexafluoride molecular adsorption and strong S-F bond activation at the same time. In the existing catalytic degradation technology, the catalyst is mostly dependent on noble metals (such as Pt, pd, au, ag and the like) or special heterostructures (such as FeOOH/SiC and Ga/Al 2O3). The catalyst has the obvious defects of (1) rare noble metal raw materials, high cost and complex preparation process flow of a special heterostructure, so that the catalyst is high in mass production cost, (2) the catalyst is easy to be poisoned due to erosion of fluorine and sulfur species in the reaction process and is often deactivated due to irreversible oxidation of active metal sites, and the circulation stability is poor, and thirdly, most of the catalyst needs to operate in an inert atmosphere or under specific severe conditions at the temperature of more than 600 ℃, is disjointed with the actual atmospheric environment, and the practical application value is severely limited. The kiln slag of the zinc smelting rotary kiln is taken as a typical large amount of industrial solid waste, the main components of the kiln slag comprise iron, zinc, carbon and silicon, and the kiln slag has potential activity as a catalytic material, but no related technical report on directly using the kiln slag for degrading SF 6 exists at present, and the high-value utilization potential of the industrial solid waste is not fully exploited. Therefore, aiming at the dual-technology pain points of high cost, complex preparation, poor stability, harsh reaction conditions and low industrial kiln slag recycling utilization rate of the existing SF 6 degradation catalyst, the SF 6 degradation catalytic material which is based on industrial solid waste kiln slag, simple in process, low in cost, excellent in performance and suitable for actual application scenes is developed, and has both environmental benefit and economic benefit, and important academic value and industrial application prospect. Disclosure of Invention The first aspect of the invention aims to provide a preparation method of kiln slag-based Fe 2O3/C catalytic material, which takes industrial solid waste zinc smelting rotary kiln slag as a raw material, does not need to add additional active components or carbon sources, and has simple process and low cost. The technical scheme adopted by the invention is as follows: The preparation method of the kiln slag-based Fe 2O3/C catalytic material comprises the following steps: (1) Pretreating the kiln slag of the zinc smelting rotary kiln to obtain kiln slag raw materia