Preparation process for preparing photocatalyst from blast furnace slag serving as raw material

A photocatalyst and preparation process technology, applied in physical/chemical process catalysts, chemical instruments and methods, chemical/physical processes, etc., can solve the problem of long preparation time, unfavorable clean production, and the quality of hydrothermal reaction precursors cannot be guaranteed. and other problems, to achieve the effect of promoting the improvement of photocatalytic activity, improving the efficiency of photocatalytic oxidation, and avoiding the problem of yellow smoke

Inactive Publication Date: 2011-05-25
WUHAN IRON & STEEL (GROUP) CORP +1
View PDF4 Cites 8 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

There are following problems in above-mentioned processing method: (1) environmental pollution is big: as adopting concentrated nitric acid to fuse in the preparation process, yellow smog NO can be produced in the reaction process 2 , pollute the environment, is not conducive to the realization of clean production
(2) The preparation time is long: when the slag is carried out to the acid-dissolution reaction, in order to fully dissolve the slag, the reaction process needs at least 48 hours, and the long time consumption brings the problems of low production efficiency and increased cost; (3) poor controllability of the reaction: This acid-soluble reaction is exposed to the external environment and is greatly affected by ambient temperature and humidity. In addition, the reaction time is long, which makes the reaction process poor in controllability, repeatability and operability, and the quality of the obtained hydrothermal reaction precursor is poor. less than guaranteed
(4) Not suitable for low-titanium or titanium-free slag: due to the extremely important effect of titanium on the performance of photocatalysts, the use of slag to prepare photocatalysts is limited to the use of slag with high titanium content as raw materials. For low-titanium or even no-titanium slag The slag with titanium content is difficult to prepare a photocatalyst that meets the performance requirements
Based on the above reasons, such inventions are only in the stage of experimental research at present, and have not yet been popularized and applied.

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Preparation process for preparing photocatalyst from blast furnace slag serving as raw material
  • Preparation process for preparing photocatalyst from blast furnace slag serving as raw material
  • Preparation process for preparing photocatalyst from blast furnace slag serving as raw material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Main components of blast furnace slag: SiO 2 Is 5.21wt%, Al 2 O 3 7wt%, Fe 2 O 3 24wt%, CaO 18.2wt%, MgO 9.75wt%, Co is 0.008wt%, Cr is 0.20wt%, Cu is 0.001wt%, V is 0.23wt%, W is 0.009wt%, P is 1wt% , S is 0.003wt%, and the balance is unavoidable impurities.

[0019] After grinding the blast furnace slag with the above composition to below 200 mesh, mix it with the mixed acid (molar ratio of sulfuric acid and nitric acid is 1:1) at a mass ratio of 1:17, and disperse ultrasonically for 30 minutes and then move it into the autoclave. The filling degree is 60%, acidolysis is carried out at a constant temperature of 180°C for 10 hours, cooled to room temperature, and left to stand. Take out all the supernatant and bottom colloids as the precursors of the hydrothermal reaction;

[0020] Adjust the pH value of the hydrothermal reaction precursor to 4 with sodium hydroxide solution, stir it evenly, then age for 6h, transfer it into the autoclave with a filling degree of 80%, contr...

Embodiment 2

[0024] Main components of blast furnace slag: SiO 2 11.31wt%, Al 2 O 3 0.8wt%, Fe 2 O 3 28.6wt%, CaO 30.9wt%, MgO 18.55wt%, TiO 2 Is 0.95wt%, Co is 0.005wt%, Cr is 0.06wt%, Cu is 0.005wt%, V is 0.005wt%, W is 0.005wt%, P is 1.34wt%, S is 0.05wt%, and the balance is Inevitable impurities.

[0025] After grinding the blast furnace slag with the above composition to below 200 mesh, mix it with the mixed acid (the molar ratio of sulfuric acid and nitric acid is 1:0.4) at a mass ratio of 1:5, and disperse ultrasonically for 20 minutes and then move it into the high-pressure reactor. The filling degree is 70%, acidolysis is carried out for 8 hours under the constant temperature of 160℃, cooled to room temperature, and left to stand. Take the supernatant and the bottom colloid as the precursors of the hydrothermal reaction;

[0026] Adjust the pH value of the hydrothermal reaction precursor to 12 with sodium hydroxide solution, stir it evenly, then age for 16h, transfer it into the autocl...

Embodiment 3

[0028] Main components of blast furnace slag: SiO 2 27.08wt%, Al 2 O 3 21.9wt%, Fe 2 O 3 0.5wt%, CaO is 40wt%, MgO is 3.38wt%, TiO 2 0.42wt%, Co is 0.008wt%, Cr is 0.43wt%, Cu is 0.009wt%, V is 0.10wt%, W is 0.002wt%, P is 0.002wt%, S is 0.27wt%, and the balance is Inevitable impurities.

[0029] After grinding the blast furnace slag with the above composition to below 200 mesh, mix it with the mixed acid (the molar ratio of sulfuric acid and nitric acid is 1:2) at a mass ratio of 1:3, and ultrasonically disperse for 20 minutes and move it into the high-pressure reactor. The filling degree is 70%, acidolysis is carried out for 8 hours under the constant temperature of 160℃, cooled to room temperature, and left to stand. Take the supernatant and the bottom colloid as the precursors of the hydrothermal reaction;

[0030] Adjust the pH value of the hydrothermal reaction precursor to 12 with sodium hydroxide solution, stir it evenly, then age for 16h, transfer it into the autoclave wit...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

No PUM Login to view more

Abstract

The invention relates to a preparation process for preparing a photocatalyst from blast furnace slag serving as a raw material, which solves the problems of high time consumption, environmental pollution, low production efficiency and poor reaction controllability existing in the conventional preparation of the photocatalyst from furnace slag. The technical scheme comprises the following steps of: performing acid hydrolysis on the blast furnace slag and mixed acid in a high-pressure reaction kettle, cooling and extracting supernate and bottom colloid serving as precursors for a hydro-thermal reaction; and adjusting the pH values of the precursors for the hydro-thermal reaction, transferring the precursors into the high-pressure reaction kettle for reacting, cooling, filtering, washing with distilled water, drying filter residues, and grinding so as to obtain the photocatalyst. The photocatalyst has high preparation efficiency, high reaction controllability and high repeatability, does not cause environmental pollution, and low-titanium blast furnace slag and even titanium-free blast furnace slag can be taken as a raw material. Various properties of the photocatalyst prepared by the process are high.

Description

Technical field [0001] The invention relates to a photocatalyst preparation process, in particular to a photocatalyst preparation process using blast furnace slag as a raw material. Background technique [0002] my country is the world's largest steel producer and consumer. The stacking of metallurgical slag not only occupies a lot of land, but also pollutes the environment, especially the pollution of harmful and toxic metals to the surface and groundwater sources seriously threatens people's health. The country attaches great importance to the comprehensive utilization of iron and steel metallurgical slag. At present, researchers have carried out various uses of metallurgical slag in order to solve the above problems. In the use of titanium-containing slag to prepare photocatalysts, for example, the name "modified titanium-containing blast furnace slag catalyst with visible light catalytic activity and its preparation method" (Patent No. CN101402036A) discloses a kind of high...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
IPC IPC(8): B01J27/199A62D3/10
Inventor 周许林刘红吴高明周志辉徐培君
Owner WUHAN IRON & STEEL (GROUP) CORP
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap