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Homogeneous carbonization preparation method of magnesium slag cementing material for smelting magnesium by silicothermic method

A cementitious material, silicothermal technology, applied in climate sustainability, cement production, sustainable waste disposal, etc., can solve the problems of insufficient internal reaction, long reaction time of magnesium slag cementitious material, uneven reaction, etc. Achieve the effect of saving energy consumption, conducive to popularization and application, and good quality

Active Publication Date: 2021-08-03
SHAANXI ACAD OF ARCHITECTONICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In this method, the magnesium slag produced by silicothermal magnesium smelting is taken out of the furnace through rapid air cooling to increase the hydration activity, thereby improving the number of pores and the uniformity of pore distribution in the magnesium slag cemented blank after curing and hydration, and thereby improving the uniformity of the subsequent carbonization process. It solves the problems of too long reaction time, uneven reaction and insufficient internal reaction of the magnesium slag cementitious material, avoids the adverse effects of uneven carbonization in the magnesium slag cementitious material on the stability, and improves the magnesium slag cementitious The quality of the gelatinous material

Method used

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  • Homogeneous carbonization preparation method of magnesium slag cementing material for smelting magnesium by silicothermic method
  • Homogeneous carbonization preparation method of magnesium slag cementing material for smelting magnesium by silicothermic method
  • Homogeneous carbonization preparation method of magnesium slag cementing material for smelting magnesium by silicothermic method

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Experimental program
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Embodiment 1

[0038] This embodiment includes the following steps:

[0039] Step 1. After the magnesium slag produced by silithermal magnesium smelting is out of the furnace, the temperature is rapidly cooled to room temperature by air cooling to obtain cooled magnesium slag; the rapid cooling is from the furnace temperature to 200° C. and then to room temperature within 2 minutes;

[0040] Step 2, put the cooled magnesium slag obtained in step 1 into a ball mill for ball milling, then sieve to collect the undersize magnesium slag; the rotating speed of the ball mill is 45r / min, and the time is 30min; 100 mesh screen;

[0041] Step 3. Mix the undersize magnesium slag obtained in step 2 with water at a speed of 65r / min for 270s to gather into agglomerates, and then put it into a mold to form a magnesium slag cemented billet; the undersize The mass ratio of magnesium slag to water is 0.3:1;

[0042] Step 4, placing the magnesium slag gelled blank obtained in step 3 in a curing room with a h...

Embodiment 2

[0076] This embodiment includes the following steps:

[0077] Step 1. After the magnesium slag produced by silithermal magnesium smelting is out of the furnace, the temperature is rapidly cooled to room temperature by air cooling to obtain cooled magnesium slag; the rapid cooling is from the furnace temperature to 200° C. and then to room temperature within 2 minutes;

[0078] Step 2, put the cooled magnesium slag obtained in step 1 into a ball mill for ball milling, then sieve to collect the undersize magnesium slag; the rotating speed of the ball mill is 45r / min, and the time is 30min; 100 mesh screen;

[0079] Step 3. Mix the undersize magnesium slag obtained in step 2 with water at a speed of 65r / min for 270s to gather into agglomerates, and then put it into a mold to form a magnesium slag cemented billet; the undersize The mass ratio of magnesium slag to water is 0.3:1;

[0080] Step 4, placing the magnesium slag gelled blank obtained in step 3 in a curing room with a h...

Embodiment 3

[0103] This embodiment includes the following steps:

[0104] Step 1. After the magnesium slag produced by silithermal magnesium smelting is out of the furnace, the temperature is rapidly cooled to room temperature by air cooling to obtain cooled magnesium slag; the rapid cooling is from the furnace temperature to 200° C. and then to room temperature within 2 minutes;

[0105] Step 2, put the cooled magnesium slag obtained in step 1 into a ball mill for ball milling, then sieve to collect the undersize magnesium slag; the rotating speed of the ball mill is 38r / min, and the time is 60min; 100 mesh screen;

[0106] Step 3. Mix the undersize magnesium slag obtained in step 2 with water at a speed of 75r / min for 240s to gather into agglomerates, and then put it into a mold to form a magnesium slag cemented billet; the undersize The mass ratio of magnesium slag to water is 0.2:1;

[0107] Step 4, placing the magnesium slag gelled blank obtained in step 3 in a curing room with a h...

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Abstract

The invention discloses a homogeneous carbonization preparation method of a magnesium slag cementing material for smelting magnesium by a silicothermic method. The method comprises the following steps: 1, discharging magnesium slag generated by smelting magnesium by the silicothermic method, and quickly cooling by air cooling to obtain cooled magnesium slag; 2, ball-milling the cooled magnesium slag, sieving, and collecting to obtain a screen underflow magnesium slag; 3, uniformly stirring the undersize magnesium slag with water until the magnesium slag is gathered into a cluster, and forming to obtain a magnesium slag cementing blank; 4, curing the magnesium slag cementing blank for 3-28 d at the humidity of 50%-90% and the normal temperature; and 5, introducing hot flue gas into the cured magnesium slag cementing blank for carbonization, and obtaining the magnesium slag cementing material. According to the method, the magnesium slag generated by smelting magnesium through the silicothermic method is discharged out of the furnace, and the hydration activity is improved through rapid air cooling, so that the pore number and pore distribution uniformity in the magnesium slag cementing blank after maintenance and hydration are improved, the uniformity of the subsequent carbonization process is improved, and the problems that the magnesium slag cementing material is too long in reaction time, non-uniform in reaction and insufficient in internal reaction are solved, and the quality of the magnesium slag cementing material is improved.

Description

technical field [0001] The invention belongs to the technical field of building materials, and in particular relates to a homogeneous carbonization preparation method of magnesium smelting magnesium slag cementitious material by silicothermal method. Background technique [0002] At present, the commonly used magnesium smelting method is the silicon thermal method, and the silicon thermal magnesium smelting slag is the industrial waste discharged during magnesium smelting, which generally contains C 2 S, CaO, MgO and other components. In our country, magnesium slag is generally treated as solid waste accumulation and landfill, resulting in a great waste of resources. Some studies have used magnesium slag as a cement admixture, but this method does not make much use of the amount of magnesium slag. The maximum blending amount of magnesium slag is only 20%, and the components in magnesium slag cannot be fully utilized to achieve silicon thermal The large-scale application of...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B40/02C04B5/00
CPCC04B40/0263C04B5/00C04B40/0254C04B40/0236Y02W30/91
Inventor 朱苗淼仁普亮
Owner SHAANXI ACAD OF ARCHITECTONICS
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