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A kind of method that utilizes steel slag to prepare the cement mortar with photocatalytic degradation NOX

A technology of cement mortar and photocatalysis, applied in the field of cement mortar, to achieve the effects of promoting sustainable development, solving the problem of solid waste recycling, and important social and economic benefits

Active Publication Date: 2016-01-20
SHANDONG JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, there is no report on the patent of using steel slag solid waste to prepare cement mortar to realize photocatalytic degradation of NOx.

Method used

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  • A kind of method that utilizes steel slag to prepare the cement mortar with photocatalytic degradation NOX
  • A kind of method that utilizes steel slag to prepare the cement mortar with photocatalytic degradation NOX
  • A kind of method that utilizes steel slag to prepare the cement mortar with photocatalytic degradation NOX

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Heat treatment of steel slag to obtain high content of α-Fe 2 o 3

[0019] (1) Take 100kg of steel slag, put it in a ball mill and grind it until the average particle size is less than 0.2mm, and the fineness modulus is 0.6-1.3;

[0020] (2) Heat-treat the ground steel slag at 850°C for 5 hours to make Fe 3 o 4 Phase change to α-Fe 2 o 3 .

Embodiment 2

[0022] The photocatalytic NOx degradation cement mortar is prepared by using steel slag, which is suitable for engineering plastering construction.

[0023] The heat-treated steel slag obtained by the method of Example 1 is used as raw material, and the specific raw material mixing ratio is shown in Table 1.

[0024] Table 1:

[0025]

Embodiment 3

[0027] The photocatalytic NOx degradation cement mortar is prepared by using steel slag, which is suitable for engineering plastering construction.

[0028] The heat-treated steel slag obtained by the method of Example 1 is used as a raw material, and the specific raw material mixing ratio is shown in Table 2.

[0029] Table 2:

[0030]

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Abstract

The invention discloses a method for preparing cement mortar with a NOx photocatalysis degradation function by using steel slag. The method comprises the steps as follows: the steel slag is taken and placed in a ball mill for ball milling until the average grain diameter is smaller than 0.2 mm and the fineness modulus is in a range of 0.6-1.3; then the levigated steel slag is subjected to heat treatment for 5-8 h at the temperature of 600-1,000 DEG C, and Fe3O4 is subjected to phase transformation to be alpha-Fe2O3; and cement, sand, the steel slag finishing heat treatment, an aliphatic water reducer and tap water are mixed and stirred in a mass ratio of 100: (100-500): (100-200): (0.2-0.4): (30-50) to obtain the cement mortar with the NOx photocatalysis degradation function. According to the method, alpha-Fe2O3 in the steel slag after heat treatment has a photocatalysis effect by absorbing visible light, so that nitrogen oxide is catalyzed and oxidized, and the atmosphere is purified; and meanwhile, the steel slag is reused, the additional value of the steel slag is improved, the sustainable development is achieved, and the method has important social benefits and economic benefits.

Description

technical field [0001] The invention belongs to the technical field of cement mortar. In particular, it relates to a method for preparing cement mortar with photocatalytic degradation of nitrogen oxides (NOx) by using steel slag solid waste. Background technique [0002] With the rapid development of the iron and steel industry, the discharge of its solid waste steel slag is also increasing rapidly. If these solid wastes are not effectively utilized and piled up for a long time, they will occupy land, silt up river courses, damage the environment and cause pollution. [0003] The chemical composition of steel slag is SiO 2 、Al 2 o 3 , CaO and iron oxides. One of the comprehensive utilization of steel slag is to use the SiO contained in it 2 、Al 2 o 3 , CaO components are used in cement and cement concrete as clinker components in the production of cement. There are also crushed steel slags that are made into fine powders as concrete admixtures, which can increase th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B28/00C04B18/14B01J23/745B01D53/56
CPCY02W30/91
Inventor 庞来学王晓英唐新德
Owner SHANDONG JIAOTONG UNIV
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