Home
About Us
Editorial
Instruction
Subscribe
Advertising
Message
Contact Us
中文
Office Online
Journal Online
Current Issue
Archive
Advanced Search
Read Articles
Download Articles
RSS
Email Alert
2024 Vol. 0, No. 07
Published: 2024-07-10
1
Optimization of particle composition of composite mineral admixtures and preparation technology of multistage ball milling in series
XING Zejia, et al
Currently, composite mineral admixtures are mostly obtained through blended grinding processes, and the particle sizes of each component cannot be effectively controlled which causes some issues such as over-grinding or under-grinding, leading to high water demand or low reactivity. The separate grinding process can achieve separate control of particle sizes for each component, but it requires large equipment investment, high retrofitting costs and high space requirements, so it has not been widely applied in traditional production enterprises. This study investigates the effects of slag and fly ash particle size on the performance of composite mineral admixtures. Taking advantage of the large number of mills in Songji New Materials Company, multiple ball mills were used in series with segmented feeding techniques to separately control the particle sizes of slag and fly ash, and blended mineral admixtures with different reactivity indices were prepared by this way. When the feeding rate is 37.5 tons per hour, the energy consumption and carbon emissions of this preparation technique are 40.5 kWh per ton and 48. 6 kg per ton respectively. The 7 d reactivity index of the blended mineral admixture reaches 71.1%, indicating optimal comprehensive benefits. When the feeding rate is reduced to 28.8 tons per hour, the 7 d reactivity index of the blended mineral admixture can be increased from 68.4% at 40.0 tons per hour to 74.8%. However, there is a higher energy consumption and carbon emissions associated with this lower feeding rate
2024 Vol. 0 (07): 1- [
Abstract
] (
39
)
HTML
(1 KB)
下载 PDF
(2016 KB) (
0
)
8
Study on determination of refractive index of ferroaluminate cement by laser particle size analysis
WANG Zhiyong, et al
The refractive index is an important input parameter for testing powder fineness using Mie theory analysis laser particle size method, but it is difficult to obtain refractive index of samples especially unknown samples such as new materials. In this study, a method determining refractive index by analysis the relationship between the input refractive index and the data fitting residual in laser particle size testing analysis was investigated. The results showed that the refractive index of the sample measured using this method has better consistency with data in literature, and using the measured refractive index as an input parameter can obtain good laser diffraction particle distribution results
2024 Vol. 0 (07): 8- [
Abstract
] (
34
)
HTML
(1 KB)
下载 PDF
(1747 KB) (
0
)
13
Study on influence of zircon content on high temperature performance of sand-containing oil well cement
ZHAO Feng, et al.
With the continuous increase of global energy demand, the development of deep and ultra deep oil and gas resources has been promoted, and cementing cement slurry is facing more and more harsh environments such as high temperature and pressure. However, conventional sand-containing oil well cement can’t meet the existing engineering requirements. This article used zircon to modify sand-containing oil well cement, explored the influence of zircon on the high temperature performance of cement slurry and cement stone, and analyzed its mechanism through microscopic testing. The results indicated that zircon has an improvement effect on the performance of cement slurry when the dosage is less than 10%. Compared with the sand-containing oil well cement, the high-temperature strength of cement stone is improved, the permeability and porosity are reduced, and the high-temperature performance of the system is enhanced. The microscopic test results showed that a small amount of zircon can promote the hydration of the sand-containing oil well cement, improve the strength and high temperature resistance of the cement stone, but excessive zircon hinders the generation of hydration products, leading to serious deterioration of the performance of the cement slurry system. The main reason is that a small amount of zircon can not only provide crystallization points for hydration products, promote the formation of hydration products, it can also be used as a filling material to fill the pores between hydration products. On the contrary, excessive addition of zircon not only causes agglomeration, but also adheres to the surface of other substances and hinders hydration.
2024 Vol. 0 (07): 13- [
Abstract
] (
37
)
HTML
(1 KB)
下载 PDF
(2903 KB) (
0
)
18
Influence of mixed materials on properties of ferroaluminate cement
XI Zheng, et al.
Ferroaluminate cement with anhydrous calcium sulphoaluminate, dicalcium silicate and tetracalcium ferroaluminate as the main clinker minerals, has low alkali fast hardening, high strength, anti-freezing, impermeability, corrosion resistance, wear resistance and other excellent properties. The cement with 10% anhydrite was added with 5%, 10%, 15%, 20% of limestone powder, fly ash and ground granulated blast furnace slag(GGBS) respectively, and the strength, setting time, free expansion rate, chloride ion diffusion coefficient and other items were tested. It was found that the addition of the mixture had no great influence on the setting time of the cement, but the strength of the cement mortar was reduced in different amplitudes. The reduction amplitute from small to large was GGBS, limestone powder, fly ash. With the increase of the addition amount, the strength gradually decreased. The chloride diffusion coefficient of the ferric aluminate cement can be reduced by adding appropriate amount of limestone powder
2024 Vol. 0 (07): 18- [
Abstract
] (
26
)
HTML
(1 KB)
下载 PDF
(1368 KB) (
1
)
21
Research and discussion on technical route of harmless cooperative disposal of low moisture municipal sludge by cement kiln
Hot!
LIU Kai, et al.
2024 Vol. 0 (07): 21- [
Abstract
] (
35
)
HTML
(1 KB)
下载 PDF
(3914 KB) (
2
)
26
Experimental study on harmful components in kiln tail gas for cooperative disposal of metallurgical desulfurization slag by cement kilns
LIU Shunling, et al
2024 Vol. 0 (07): 26- [
Abstract
] (
10
)
HTML
(1 KB)
下载 PDF
(1309 KB) (
0
)
30
Study on different alternative fuels used in cement kilns
REN Mingzheng, et al
2024 Vol. 0 (07): 30- [
Abstract
] (
34
)
HTML
(1 KB)
下载 PDF
(1259 KB) (
1
)
33
Research and discussion on technical path of CO treatment for cement kiln tail gas
Hot!
CHEN Xuegong
2024 Vol. 0 (07): 33- [
Abstract
] (
49
)
HTML
(1 KB)
下载 PDF
(1923 KB) (
0
)
36
Comparative study on technical performance of variable flow field electrostatic precipitator and conventional electrostatic precipitator
AI Pu, et al.
By analyzing the structural characteristics of the variable flow field electrostatic precipitator technology and conventional electrostatic precipitator technology, the force of charged dust in the electric field, the effective dust collection area, and the wind speed of electric field were analyzed, and a cold physical test pilot platform was built to conduct dust removal performance tests on variable flow field electrostatic precipitator technology and conventional electrostatic precipitator technology. The results showed that under the conditions of increasing the total dust collection area, changing the gas flow direction, and reducing the electric field wind speed of the electric field, the dust removal performance of the variable flow field electric field structure has not been breakthrough, and the dust removal efficiency has slightly decreased. The possible reasons for the insufficient dust removal efficiency of variable flow field grid plates were analyzed from the perspective of structural characteristics and current density. At the same time, improvement measures were proposed to improve the operational efficiency of variable flow field electrostatic precipitators, thereby providing a reference for the optimization and design of electric field structures in electrostatic precipitators.
2024 Vol. 0 (07): 36- [
Abstract
] (
19
)
HTML
(1 KB)
下载 PDF
(1838 KB) (
0
)
40
Discussion on upgrading technology of bag dust collector
HAN Defu, et al.
2024 Vol. 0 (07): 40- [
Abstract
] (
27
)
HTML
(1 KB)
下载 PDF
(2470 KB) (
0
)
43
Production of P· II airport special cement with high content of waste slag
Hot!
FANG Renyu, et al.
2024 Vol. 0 (07): 43- [
Abstract
] (
33
)
HTML
(1 KB)
下载 PDF
(1303 KB) (
0
)
46
Red mud substitutes for iron raw material to produce cement clinker
LIANG Heng, et al.
2024 Vol. 0 (07): 46- [
Abstract
] (
35
)
HTML
(1 KB)
下载 PDF
(1255 KB) (
0
)
49
Measures to reduce exhaust gas temperature at C1 exit of kiln end and energy consumption
LI Benlong, et al
2024 Vol. 0 (07): 49- [
Abstract
] (
25
)
HTML
(1 KB)
下载 PDF
(1655 KB) (
0
)
51
Measures to improve safety management of dry calcium carbide slag storage in cement production line
CAO Huihui, et al
2024 Vol. 0 (07): 51- [
Abstract
] (
18
)
HTML
(1 KB)
下载 PDF
(1464 KB) (
0
)
54
Energy saving transformation of coal grinding system
ZHOU Fuhao, et al
2024 Vol. 0 (07): 54- [
Abstract
] (
34
)
HTML
(1 KB)
下载 PDF
(1087 KB) (
0
)
55
Automatic iron removal technology of material in belt conveyor
REN Dongsheng, et al
2024 Vol. 0 (07): 55- [
Abstract
] (
20
)
HTML
(1 KB)
下载 PDF
(1223 KB) (
0
)
57
Calcium carbide slag belt conveyor power system equipment upgrading
QIN Lujun, et al
2024 Vol. 0 (07): 57- [
Abstract
] (
19
)
HTML
(1 KB)
下载 PDF
(1308 KB) (
2
)
59
Digital control platform helps cement grinding system to increase production and reduce consumption
Hot!
ZHANG Yuechun, et al.
2024 Vol. 0 (07): 59- [
Abstract
] (
36
)
HTML
(1 KB)
下载 PDF
(3261 KB) (
0
)
62
Realization of waste heat power generation intelligent sewage system in 5 000 t/d clinker production line
AN Xin, et al.
2024 Vol. 0 (07): 62- [
Abstract
] (
23
)
HTML
(1 KB)
下载 PDF
(1969 KB) (
0
)
66
Application of intelligent grab in cement plant multiple silo
ZHANG Rixing, et al.
2024 Vol. 0 (07): 66- [
Abstract
] (
19
)
HTML
(1 KB)
下载 PDF
(1447 KB) (
0
)
69
Experimental study on determination of cement components P and S by automatic cement component tester
LIU Shuang, et al.
2024 Vol. 0 (07): 69- [
Abstract
] (
25
)
HTML
(1 KB)
下载 PDF
(1286 KB) (
0
)
72
Improvement of sealing structure of pinion in rotary kiln
YANG Zhenhua
2024 Vol. 0 (07): 72- [
Abstract
] (
24
)
HTML
(1 KB)
下载 PDF
(1143 KB) (
0
)
73
Research on influence of stone powder content on performance of mechanized sand concrete
XIAO Xin, et al
Stone powder is an important characteristic of machine-made sand, which is different from natural sand. The addition of stone powder to concrete has a significant impact on its workability, physical and mechanical properties, and durability. Driven by the concepts of environmental protection and sustainable development, mechanism sand has gradually become the mainstream of today’s society. However, due to limitations in manufacturing technology, machine-made sand contains a large amount of stone powder, which will seriously reduce the strength of concrete. This project aims to explore the changes in various properties of concrete and determine the amount of stone powder in the C35 concrete mix ratio through two different fineness modulus mechanism sand mixing methods. The test results show that when the mixing ratio of the two kinds of sand is 50:50, the sand powder content of the mixing mechanism is 15.8%, and the performance indexes of concrete are the best. Through the gradient test, the optimal mix ratio and the corresponding stone powder content of machine-made sand for concrete are obtained. The research results of this project will play a certain guiding role in the rational use of resources, the preparation of high-quality machine-made sand and the application of machine-made sand
2024 Vol. 0 (07): 73- [
Abstract
] (
50
)
HTML
(1 KB)
下载 PDF
(1268 KB) (
0
)
77
Application of concrete blanket in rural water conservancy engineering
SHI Gangling, et al.
2024 Vol. 0 (07): 77- [
Abstract
] (
15
)
HTML
(1 KB)
下载 PDF
(1594 KB) (
0
)
80
Research on application of recycled fine aggregate concrete with high brick slag content
SI Fanghai, et al
In order to improve the utilization rate of construction solid waste, a study was conducted on processing high brick slag content construction solid waste into recycled fine stone and recycled fine aggregate to prepare medium and low strength recycled fine stone concrete, which was applied in I-A and I-B environments such as cushion layers, leveling layers, filling layers, and slope finding layers. By means of reducing the particle size of recycled aggregates, fully pre wetting recycled fine stones, and developing specialized admixtures, the shortcomings of high brick slag content recycled fine stone concrete, such as fast loss of flowability and easy pump blockage, have been solved. At the same time, by integrating the design methods of ordinary concrete and lightweight aggregate concrete, the problem of mix proportion design for recycled fine aggregate concrete has been solved, and the quality control indicators and maximum volume replacement rate of recycled fine aggregate and recycled fine aggregate have been proposed. Finally, successfully configured recycled fine aggregate concrete with good working performance and strength levels such as C15, C20, and C25 that meet the requirements. Identify a batch resource utilization approach for high value-added construction solid waste with high brick slag content.
2024 Vol. 0 (07): 80- [
Abstract
] (
10
)
HTML
(1 KB)
下载 PDF
(1455 KB) (
0
)
84
Research on bridge appearance disease target detection based on deep learning
CHENG Qifeng, et al.
2024 Vol. 0 (07): 84- [
Abstract
] (
19
)
HTML
(1 KB)
下载 PDF
(2075 KB) (
0
)
89
Analysis on key techniques of foundation pit protection construction of high-speed railway bridge spanning existing railway
SONG Yating
2024 Vol. 0 (07): 89- [
Abstract
] (
13
)
HTML
(1 KB)
下载 PDF
(1761 KB) (
0
)
Copyright © Editorial Board of Journal of Cement
Supported by:
Beijing Magtech
