Unlock instant, AI-driven research and patent intelligence for your innovation.

A method for improving the hydration activity of low-activity air-cooled blast furnace slag

A low-activity wind and blast furnace slag technology, applied in the field of building materials, can solve problems such as differences in excitation effects, reduced added value of products, and inability to accurately control the fineness

Active Publication Date: 2021-01-05
BEIJING UNIV OF TECH
View PDF9 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Using physical excitation for blast furnace slag will consume a lot of power, which reduces the added value of the product, and the fineness cannot be accurately controlled
However, the excitation effect of chemical excitation will be unstable in practical applications, and the excitation effect of the same activator on different blast furnace slags will be very different.

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
  • A method for improving the hydration activity of low-activity air-cooled blast furnace slag
  • A method for improving the hydration activity of low-activity air-cooled blast furnace slag
  • A method for improving the hydration activity of low-activity air-cooled blast furnace slag

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0027] For a less active blast furnace slag, its chemical composition is:

[0028]

[0029] The design process conditions are: the calcination atmosphere is air; the furnace temperature is 1450°C; the cooling method is air-cooled; the heating system is that the ingredients are raised from room temperature to 950°C in 20 minutes, kept for 30 minutes, and then continue to heat up, and burn to 1450°C for about 40 minutes to melt After 30 minutes of heat preservation, the slag is released from the furnace, cooled by a fan and granulated. The activity index of blast furnace slag refers to the ratio of the compressive strength of the comparison mortar and the test mortar mixed with blast furnace slag at the same age (7d, 28d). According to the determination method of the activity index in the national standard GB / T 18046-2008, the activity index of 7 days and 28 days is as follows:

[0030]

[0031] The above-mentioned low-activity blast furnace slag was adjusted by chemical ...

example 2

[0040] For a less active blast furnace slag, its chemical composition is:

[0041]

[0042] The design process conditions are: the calcination atmosphere is air; the furnace temperature is 1450°C; the cooling method is air-cooled; the heating system is that the ingredients are raised from room temperature to 950°C after 20 minutes, kept for 30 minutes, and then continue to heat up, and burn to 1450°C for about 40 minutes to melt After 30 minutes of heat preservation, the slag is released from the furnace, cooled by a fan and granulated. The activity index of blast furnace slag refers to the ratio of the compressive strength of the comparison mortar and the test mortar mixed with blast furnace slag at the same age (7d, 28d). According to the determination method of the activity index in the national standard GB / T 18046-2008, the activity index of 7 days and 28 days is as follows:

[0043]

[0044]

[0045] The degree of polymerization of the above-mentioned low-activi...

example 3

[0051] For a less active blast furnace slag, its chemical composition is:

[0052]

[0053] The design process conditions are: the calcination atmosphere is air; the furnace temperature is 1450°C; the cooling method is air-cooled; the heating system is that the ingredients are raised from room temperature to 950°C after 20 minutes, kept for 30 minutes, and then continue to heat up, and burn to 1450°C for about 40 minutes to melt After 30 minutes of heat preservation, the slag is released from the furnace, cooled by a fan and granulated. The activity index of blast furnace slag refers to the ratio of the compressive strength of the comparison mortar and the test mortar mixed with blast furnace slag at the same age (7d, 28d). According to the determination method of the activity index in the national standard GB / T 18046-2008, the activity index of 7 days and 28 days is as follows:

[0054]

[0055] The above-mentioned low-activity blast furnace slag is added with an appro...

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 method for improving the hydration activity of low-activity air-cooled blast furnace slag, belonging to the technical field of building materials. Blast furnace slag has poor working performance in practical engineering application, so that the quality of blast furnace slag needs to be improved in production and application process mainly through the following methods: (1) adding a glass body network forming agent for modification, wherein alumina and silicon oxide are added to adjust the proportion of the glass body network forming agent, so as to reduce the degreeof polymerization of a blast furnace slag structure, and the ratio of alumina to silicon oxide is mainly regulated by fly ash that meets the requirements; (2) adding a glass body network cationic modifier for modification, wherein barium oxide and phosphorus oxide are added to reduce the degree of polymerization of the blast furnace slag structure; (3) adding a glass body network anion modifier for modification, wherein halogen inorganic salts are added into blast furnace slag components. The 7day and 28day activities of the improved air-cooled blast furnace slag can be improved by 10% or more.

Description

technical field [0001] A method for improving the hydration activity of low-activity air-cooled blast furnace slag belongs to the technical field of building materials. Background technique [0002] Smelting pig iron produces many by-products, one of which is blast furnace slag. Blast furnace slag has become an indispensable functional material in the field of building materials because of its potential hydraulic activity. However, affected by the chemical composition of smelted pig iron ore, there are differences in the chemical composition, mineral composition, and hydraulic activity of blast furnace slag. The 28-day hydraulic activity of different blast furnace slags can vary by more than tens of MPa, and some high The low hydration activity of slag seriously affects its working performance, and its activity must be stimulated before it can be used in the field of building materials. The main means of stimulating blast furnace slag are physical excitation and chemical ex...

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
Patent Type & Authority Patents(China)
IPC IPC(8): C04B20/04
CPCC04B20/04C04B18/141C04B18/08
Inventor 王亚丽姚羽涵王剑锋刘辉王卉崔素萍韦奇
Owner BEIJING UNIV OF TECH