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

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...

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.

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