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US-12617716-B2 - Visible light-catalyzed translucent concrete, and preparation method and use thereof

US12617716B2US 12617716 B2US12617716 B2US 12617716B2US-12617716-B2

Abstract

The present disclosure relates to a visible light-catalyzed translucent concrete, and a preparation method and use thereof. The preparation method includes: extracting an iron oxide from a copper slag, mixing the iron oxide with TiO 2 to obtain a photocatalyst, and then mixing the photocatalyst with an additive to obtain a photocatalytic slurry; preparing a concrete slurry using the copper slag after iron extraction as an aggregate; and pouring the photocatalytic slurry, the concrete slurry, and the photocatalytic slurry in sequence into a mold pre-laid with an optical fiber, to obtain the visible light-catalyzed translucent concrete. In the visible light-catalyzed translucent concrete, iron in the copper slag is used as a part of raw materials of the photocatalyst, and the copper slag after iron extraction is used as an aggregate to replace natural sand and gravel. This solves environmental pollutions caused by the copper slag and realizes resource utilization.

Inventors

  • Kai Li
  • Siyang Li
  • Xin Sun
  • CHUNXUE WANG
  • Jie Yang
  • Fei Wang
  • Chi Wang
  • Yixing Ma
  • Yuan Li
  • Lei Shi

Assignees

  • KUNMING UNIVERSITY OF SCIENCE AND TECHNOLOGY
  • YUNNAN BLUE ENVIRONMENTAL ENGINEERING TECH CO., LTD.
  • JIANGXI BLUE ENVIRONMENTAL ENGINEERING TECH CO., LTD.

Dates

Publication Date
20260505
Application Date
20230621

Claims (10)

  1. 1 . A preparation method of a visible light-catalyzed translucent concrete, comprising the following steps: mixing and grinding a copper slag and an alkaline activator to obtain a mixture, and heating the mixture to conduct thermal activation to obtain an activated slag; subjecting the activated slag to magnetic separation to obtain an iron oxide and a copper slag tailing; impregnating the iron oxide and titanium dioxide in a polar solvent to obtain an impregnation dispersion, removing the solvent from the impregnation dispersion, and conducting roasting to obtain a TiO 2 -doped photocatalyst; mixing the TiO 2 -doped photocatalyst, an adhesive, a silane coupling agent, a dispersant, a thickener, and water to obtain a photocatalytic slurry; mixing the copper slag tailing, cement, a water reducer, and water to obtain a concrete slurry; and pouring the photocatalytic slurry, the concrete slurry, and the photocatalytic slurry in sequence into a mold pre-laid with an optical fiber, to form a first photocatalytic slurry layer, a concrete slurry layer, and a second photocatalytic slurry layer that are sequentially laminated, wherein the optical fiber penetrates the first photocatalytic slurry layer, the concrete slurry layer, and the second photocatalytic slurry layer; and conducting solidification and demolding to obtain the visible light-catalyzed translucent concrete.
  2. 2 . The preparation method according to claim 1 , wherein the alkaline activator comprises an alkali metal carbonate and/or an alkaline earth metal oxide; and the copper slag and the alkaline activator are at a mass ratio of 10:(0.5-2).
  3. 3 . The preparation method according to claim 2 , wherein the thermal activation is conducted at 900° C. to 1,200° C. for 1 h to 3 h.
  4. 4 . The preparation method according to claim 1 , wherein the thermal activation is conducted at 900° C. to 1,200° C. for 1 h to 3 h.
  5. 5 . The preparation method according to claim 1 , wherein the magnetic separation is conducted at a magnetic field intensity of 160 kA/m to 480 kA/m.
  6. 6 . The preparation method according to claim 1 , wherein the iron oxide and the titanium dioxide are at a mass ratio of (10-30):(80-110); the impregnating is conducted for 1 h to 3 h; and the roasting is conducted at 400° C. to 600° C. for 2 h to 4 h.
  7. 7 . The preparation method according to claim 1 , wherein the photocatalytic slurry comprises the following components in parts by weight: 5 parts to 10 parts of the TiO 2 -doped photocatalyst, 30 parts to 60 parts of the adhesive, 0.5 parts to 2 parts of the silane coupling agent, 0.2 parts to 0.6 parts of the dispersant, 0.5 parts to 1.2 parts of the thickener, and 5 parts to 12 parts of water.
  8. 8 . The preparation method according to claim 1 , wherein the concrete slurry comprises the following components in parts by weight: 60 parts to 80 parts of the copper slag tailing, 10 parts to 18 parts of the cement, 0.3 parts to 2 parts of the water reducer, and 200 parts to 350 parts of water.
  9. 9 . A method for preparing a building wall using the visible light-catalyzed translucent concrete prepared by the preparation method according to claim 1 .
  10. 10 . The method according to claim 9 , wherein the first photocatalytic layer and the second photocatalytic layer have independently a thickness of 10 mm to 30 mm, and the intermediate translucent concrete layer has a thickness of 150 mm to 450 mm.

Description

CROSS REFERENCE TO RELATED APPLICATION This patent application claims the benefit and priority of Chinese Patent Application No. 202210727517.5, filed with the China National Intellectual Property Administration on Jun. 24, 2022, the disclosure of which is incorporated by reference herein in its entirety as part of the present application. TECHNICAL FIELD The present disclosure belongs to the technical field of solid waste treatment, and in particular relates to a visible light-catalyzed translucent concrete, and a preparation method and use thereof. BACKGROUND Copper slag is an industrial solid waste produced during the copper smelting. According to statistics, there is copper slag piled up at present that has exceeded 50 million tons, occupying a large amount of land resources. Moreover, toxic and harmful heavy metal particles in the copper slag are easily leached during the stacking and migrate to the soil, rivers, and air, causing serious environmental pollutions. As a compound ore metallurgical slag containing valence metal compounds, copper slag has large quantity, low particle size, various types, and complex composition. The copper slag contains various valuable metals such as Fe, Cu, Zn, Pb, Co, and Ni, and a small amount of precious metals such as Au and Ag. Copper slag has not less than 35% of Fe element, which mainly exists in the form of fayalite (2FeO·SiO2) and a small amount of magnetite (Fe3O4). Cu element in the copper slag mainly exists in the form of chalcocite (Cu2S), metallic copper, and copper oxide. At present, the copper slag is generally treated through traditional ore dressing to conduct iron separation. However, the composition and structure of copper slag make iron ore concentrate unable to be used directly due to low yield, high silicon content, and poor quality. This results in that the copper slag has an iron utilization rate of less than 1%, and a copper slag recycling rate of less than 12%. SUMMARY An objective of the present disclosure is to provide a visible light-catalyzed translucent concrete, and a preparation method and use thereof. In the present disclosure, the visible light-catalyzed translucent concrete not only realizes the full resource utilization of copper slag, but also can effectively degrade harmful gases such as NOx, SO2, and HCHO in the air, thereby achieving air purification. To achieve the above objective, the present disclosure provides the following technical solutions: The present disclosure provides a preparation method of a visible light-catalyzed translucent concrete, including the following steps: mixing and grinding a copper slag and an alkaline activator to obtain a mixture, and heating the mixture to conduct thermal activation to obtain an activated slag;subjecting the activated slag to magnetic separation to obtain an iron oxide and a copper slag tailing;impregnating the iron oxide and titanium dioxide in a polar solvent to obtain an impregnation dispersion, removing the solvent from the impregnation dispersion, and conducting roasting to obtain a TiO2-doped photocatalyst;mixing the TiO2-doped photocatalyst, an adhesive, a silane coupling agent, a dispersant, a thickener, and water to obtain a photocatalytic slurry;mixing the copper slag tailing, cement, a water reducer, and water to obtain a concrete slurry; andpouring the photocatalytic slurry, the concrete slurry, and the photocatalytic slurry in sequence into a mold pre-laid with an optical fiber, to form a first photocatalytic slurry layer, a concrete slurry layer, and a second photocatalytic slurry layer that are sequentially laminated, wherein the optical fiber penetrates the first photocatalytic slurry layer, the concrete slurry layer, and the second photocatalytic slurry layer; and conducting solidification and demolding to obtain the visible light-catalyzed translucent concrete. Preferably, the alkaline activator includes an alkali metal carbonate and/or an alkaline earth metal oxide; and the copper slag and the alkaline activator are at a mass ratio of 10:(0.5-2). Preferably, the thermal activation is conducted at 900° C. to 1,200° C. for 1 h to 3 h. Preferably, the magnetic separation is conducted at a magnetic field intensity of 160 kA/m to 480 kA/m. Preferably, the iron oxide and the titanium dioxide are at a mass ratio of (10-30):(80-110); the impregnating is conducted for 1 h to 3 h; and the roasting is conducted at 400° C. to 600° C. for 2 h to 4 h. Preferably, the photocatalytic slurry includes the following components in parts by weight: 5 parts to 10 parts of the TiO2-doped photocatalyst, 30 parts to 60 parts of the adhesive, 0.5 parts to 2 parts of the silane coupling agent, 0.2 parts to 0.6 parts of the dispersant, 0.5 parts to 1.2 parts of the thickener, and 5 parts to 12 parts of water. Preferably, the concrete slurry includes the following components in parts by weight: 60 parts to 80 parts of the copper slag tailing, 10 parts to 18 parts of the cement, 0.3 parts to 2