Utilization of flotation wastes of copper slag as raw material in cement production

2008 ◽  
Vol 159 (2-3) ◽  
pp. 390-395 ◽  
Author(s):  
İ. Alp ◽  
H. Deveci ◽  
H. Süngün
Keyword(s):  
Copper Slag ◽  
Raw Material ◽  
Cement Production ◽  
Flotation Wastes

scholarly journals Feasibility and Carbon Footprint Analysis of Lime-Dried Sludge for Cement Production

2020 ◽  
Vol 12 (6) ◽  
pp. 2500 ◽  
Author(s):  
Li Ping ◽  
Gang Zhao ◽  
Xiaohu Lin ◽  
Yunhui Gu ◽  
Wei Liu ◽  
...  
Keyword(s):  
Carbon Footprint ◽  
Raw Material ◽  
Cement Clinker ◽  
Cement Kiln ◽  
Drying Process ◽  
Cement Production ◽  
Footprint Analysis ◽  
Cement Kilns ◽  
Cement Manufacturing ◽  
Dried Sludge

Cement manufacturing and the treatment of sludge are considered both energy-intensive industries and major greenhouse gas (GHG) emitters. However, there are still few studies on comprehensive carbon footprint analysis for adding municipal sludge in the cement production. In this study, the lime-dried sludge blended with calcium oxide at the mass mixing ratio of 10% was utilized as raw material for the preparation of Portland cement. The chemical and physical properties of sludge were analyzed. A set of carbon footprint calculation methods of lime-drying treatment of sludge and reuse in cement kilns was then established to explore the feasibility of coprocessing lime-dried sludge in cement kilns. The results showed lime-dried sludge containing CaO, SiO2, Al2O3, and Fe2O3 was ideal for cement production as raw material. However, the water content of lime-dried sludge should be strictly limited. The lime-drying process presented the biggest carbon emission (962.1 kg CO2-eq/t sludge), accounting for 89.0% of total emissions. In the clinker-production phase, the lime-dried sludge as raw material substitute and energy source gained carbon credit of 578.8 and 214.2 kg CO2-eq/t sludge, respectively. The sludge used for producing cement clinker could reduce carbon emissions by 38.5% to 51.7%. The addition ratio of lime and stacking time in the sludge lime-drying process could greatly affect the carbon footprint of coprocessing lime-dried sludge in cement kiln.

scholarly journals Quartz bentonite sandmix in sand-lime products

2019 ◽  
Vol 9 (1) ◽  
pp. 367-373 ◽  
Author(s):  
Katarzyna Komisarczyk ◽  
Przemyław Czapik ◽  
Kamila Komisarczyk
Keyword(s):  
Quartz Sand ◽  
Environmental Problem ◽  
Road Construction ◽  
Physicochemical Characteristics ◽  
Waste Utilization ◽  
Raw Material ◽  
Cement Production ◽  
Sustainable Solutions ◽  
Low Toxicity ◽  
Positive Effect

AbstractThe challenge related to waste management has become a serious worldwide environmental problem. Highly sustainable solutions, which do not involve reworking the material and are based on waste utilization, are sought. Such waste as used casting compounds, which so far has been used, among others, in construction, road construction, mining and cement production. Descriptions of the use of various waste moulding compounds, such as waste quartz compounds with water glass, quartz chamotte and quartz bentonite can be found in the literature. Due to the high content of quartz and low toxicity of bentonite sandmix, an attempt was done to use them for the production of sand-lime products.The aim of this article is to determine the suitability of the waste material as a substitute for quartz sand in the production of sand-lime products. The usability of waste was determined by laboratory tests of physicochemical characteristics of the finished silicates. Sand, which is a carrier of silica, was replaced with used moulding compounds with fractions up to 0.5 mm, in the weight amounts of 5.5, 11 and 16.5%. Applying up to 11% of used casting materials as a substitute for quartz sand with a lime content of 5.5% in the raw material mixture has a clearly positive effect on compressive strength. However, the higher share of sand substitution in the mixture weakens the mechanical features of the obtained materials. The absorptivity of the finished products increases with the increase of the inserted additions’ amounts. The influence of significant amounts of casting compound additives on the microstructure of calcium-silicate products was studied as well. It was stated, that they affect the location of the tobermorite in the volume of the autoclaved material.

Development of a Raw Material Requirement Balancing Model for a Production Process

2013 ◽  
Vol 824 ◽  
pp. 490-498
Author(s):  
B. Kareem
Keyword(s):  
Production Process ◽  
Raw Materials ◽  
Raw Material ◽  
Programming Approach ◽  
Good Tool ◽  
Cement Production ◽  
Optimal Mix ◽  
Material Requirement ◽  
Conventional Material ◽  
Crushed Limestone

Attainment of accuracy in raw materials mix for production processes has been the major problem in many production organizations in developing countries. Effects of unequal proportions of material required for a production process are not fully considered in the past studies. This study modeled the raw material requirements in a production process using proportionality based mixed linear programming approach. The objective was to find optimal mix of raw materials for the production of a unit tonnage of a product. The performance of the model was tested by comparing it with alternatively formulated model based on conventional material mix. This model was tested using a cement production system from which blasted limestone, crushed limestone; raw meal, gypsum, red alluvium, clinker and coal were used as raw materials. The conventional method of mixing materials led to 50 % surplus and shortage of materials in the process as compared with the new scheme. The model would be a good tool for accurate prediction of quantity of the raw material required in the production process.Nomenclature, the proportion of material used per ton of the processed product, the quantity of material in processed product (ton), the material proportional per ton of the product, andthe total quantity of materials needed per ton of the product,..., the counter for material type,..., the counter for material proportionality variant

Utilisation of Fluidised Fly Ash for Reduction of CO2 Emissions at Portland Cement Production

2014 ◽  
Vol 1054 ◽  
pp. 168-172
Author(s):  
Marcela Fridrichová ◽  
Karel Kulísek ◽  
Oldřich Hoffmann ◽  
Karel Dvořák ◽  
Radek Magrla
Keyword(s):  
Fly Ash ◽  
Portland Cement ◽  
Raw Material ◽  
Technological Properties ◽  
Portland Cements ◽  
Cement Production ◽  
Material Powder

The article deals with preparation of Portland cements from raw material powder with reduced carbonated component. This component is replaced with fluidised fly ash. With prepared model cements tests of basic technological properties were carried out.

Study on the Calcinations of Recycled Cement Clinker Using Waste Concrete and Waste Clay Brick

2014 ◽  
Vol 629-630 ◽  
pp. 337-342
Author(s):  
Hong Mei Ai ◽  
Su Feng Zhu
Keyword(s):  
Hydration Product ◽  
Raw Material ◽  
Cement Clinker ◽  
Sintering Process ◽  
Clay Brick ◽  
Cement Production ◽  
Construction Waste ◽  
Industry Waste ◽  
Waste Concrete ◽  
Hydration Characteristics

Utilizing construction waste, mainly waste concrete, to produce recycled cement, provides possibility for realizing the closed circulation between concrete and cement, which is an effective way for sustainable development of cement and concrete industry. Waste clay brick (WCB) and its surface-coated waste mortar are inevitably introduced into the raw meals while waste concrete is used in cement production. So on the basis of the composition characteristics of construction waste, considering of optimizing the performance of recycled cement and improving the adaptability of recycled cement to complex raw material, it's necessary to study the effect of raw meal mixing waste concrete and WCB on sintering process and property of recycled cement clinker. Mixing waste concrete and WCB in three different proportions, the burnability of raw meal, clinker mineral composition, clinker mineral morphology and hydration characteristics of recycled cement have been studied in this paper. The results indicate, the presence of WCB is beneficial for the generation and development of silicate minerals; with increasing proportion of WCB, the content of f-CaO in recycled cement clinker rises, the structure of C-S-H gel from hydration product presents higher densification and the compression strength of 3d and 28d curing period are enhanced.

scholarly journals Metode Menentukan Klor dalam Sludge Oil: Perbandingan Metode Wet dan Metode Jena

2021 ◽  
Vol 10 (1) ◽  
pp. 1-7
Author(s):  
Herliati Rahman ◽  
Akhirudin Salasa
Keyword(s):  
Environmental Sustainability ◽  
Alternative Fuels ◽  
Negative Impact ◽  
Raw Materials ◽  
Cement Industry ◽  
Raw Material ◽  
Chlorine Content ◽  
Cement Production ◽  
Average Accuracy ◽  
The Difference

Currently, the use of alternative fuels and raw materials (AFR) in the cement industry is very attractive. This is driven by demands for environmental sustainability and the efficiency of fuel and raw material costs. One of the materials that can be used as AFR is sludge oil. However, it needs to be ensured that the chlorine content in the sludge oil does not exceed the threshold so that it does not have a negative impact during the cement production process. It is known that if the chlorine content is more than the threshold, it can cause blocking or clogging of the separator and the kiln. This study aims to determine the performance of the Jena Multi EA 4000 instrument in determining the chlorine content in sludge oil quickly and accurately. Analytic Jena Multi EA 4000 is an Atomic Absorption Spectrometers (AAS) instrument that can be used for analysis of samples in the form of solids or slurries containing chlorine. As validation of the resulting analysis, the wet method is used, which as usual, to determine chlorine levels. From the statistic analysis, namely the F-test and T-test, We found that F-count equal to 0.0080 and F-table equal to 4.2839. it shows that F-count < F-table, indicating the difference in the variance of the two methods H0: s12 = s22 is accepted because there is no difference to the variability of these two tests and the value of T-count = -3.9717 and T-table = 2.1788 so that T-count <T-table is accepted because there is no difference in the average accuracy of the two methods H0: M1 = M2.  

New Technology of White Portland Cement Production in the Ural Federal District

2018 ◽  
Vol 284 ◽  
pp. 1047-1051
Author(s):  
V.S. Rudnov ◽  
V.A. Belyakov ◽  
R.T. Galiakhmetov
Keyword(s):  
Portland Cement ◽  
High Performance ◽  
New Technology ◽  
Federal District ◽  
Raw Material ◽  
Material Base ◽  
Resource Saving ◽  
Cement Production ◽  
High Temperature Synthesis ◽  
White Portland Cement

In this article the results of research to develop energy - and resource-saving technologies of production on local raw material base of the Ural Federal district of the white portland cement with high performance are represented. An x-ray phase analysis of the obtained building material is performed. The possibility of obtaining white portland cement-based pyrophillite mining waste,the composition of the raw mix for high-temperature synthesis of clinker white portland cement at low temperatures was studied. This reduces the costs for grinding of the mixture, and firing the clinker. The result of this work was the experimental batch of cement and studied all of its construction and technical characteristics.

scholarly journals Nephrite-Bearing Mining Waste As a Promising Mineral Additive in the Production of New Cement Types

Minerals ◽  
2020 ◽  
Vol 10 (5) ◽  
pp. 394 ◽  
Author(s):  
Liudmila I. Khudyakova ◽  
Evgeniy V. Kislov ◽  
Pavel L. Paleev ◽  
Irina Yu. Kotova
Keyword(s):  
Binary Systems ◽  
Building Materials ◽  
Negative Impact ◽  
Control Sample ◽  
Mining Waste ◽  
Raw Material ◽  
Low Grade ◽  
Cement Production ◽  
Ornamental Stones ◽  
Mineral Additives

A growing demand for products made of jewelry and ornamental stones, including nephrite, requires an increase in mining volume. However, only less than 30% of the extracted raw material is suitable for processing. The rest of the low grade nephrites are substandard and unclaimed, and they negatively affect various life spheres. In this regard, their involvement in industrial turnover is an actual task. One of the directions of mining waste use is production of building materials, in particular, cements. The low grade nephrite can act here as mineral additives. In the course of the research, the optimal amount of low grade nephrite waste additive was determined, which is 30% of the cement mass. The grinding time of a raw mix is 10 min. It was found that introduction of the additive affects the hydration activity of cement compositions. Compressive strength of the mixed cement is 25% higher than that of the control sample. At the same time, new phases in the hydrated cement were not recorded. Good physical and mechanical properties of the obtained cements are achieved when hardening in normal humidity conditions. Heat and humidity treatments do not facilitate the hydration processes in binary systems. The conducted studies have shown that low grade nephrite can be used as mineral additives in cement production. This will allow development of not only a new type of product, but also reduction of the negative impact of cement production on the environment.

Sign in / Sign up

Export Citation Format

Share Document