The Influences on Cement Clinker by Disposing Glyphosate Waste Mother-Liquor with Rotary Kiln

2013 ◽  
Vol 652-654 ◽  
pp. 1247-1251 ◽  
Author(s):  
Yang Bai ◽  
Lin Jin Zhang ◽  
Chuan Hui Chen ◽  
Xu Chu Ye
Keyword(s):  
Rotary Kiln ◽  
Mother Liquor ◽  
Setting Time ◽  
Water Requirement ◽  
Cement Clinker ◽  
Actual Production ◽  
Incineration Residue

Cement clinker was produced in laboratory using the same ingredient as actual production, comparing with the ones which incineration residue of glyphosate waste mother-liquor was added in. The products were characterized by XRD, and the results showed that the main constituents were not changed. And some of the main performances were tested according to GB standards. After the residue was added in, the water requirement of normal consistency remained no change as 26%; the setting time, both initial set and final set, was extended; the soundness was improved a little. And it could be inferred that within a certain range, the more the residue added in, the longer the setting time was, the better the soundness was. According to all the results, using rotary kiln to dispose the waste mother-liquor was feasible in the actual production.

The Effect on Cement Mortar and Concrete by Admixture of Spray Drying Absorption Products

1989 ◽  
Vol 178 ◽  
Author(s):  
Kirsten G. Jeppesen
Keyword(s):  
Grain Size ◽  
Fly Ash ◽  
Cement Mortar ◽  
Setting Time ◽  
Mineralogical Composition ◽  
Cement Clinker ◽  
Strength Development ◽  
Fall Meeting ◽  
Freeze Thaw ◽  
Spray Dried

AbstractSpray dried absorption products (SDA) having special characteristics are used as substitutes for cement in the preparation of mortars; the qualities of the resulting mixed mortars are described. Conditions are described for mortar mixes, data for which were presented at the MRS Fall Meeting 1987.The influence of the composition of the SDA on water requirement and setting time has been studied. A full scale project involving 3 precast, reinforced concrete front-elements containing 20 and 30 wt.% SDA is described. Strength development, mineralogical composition and corrosion were monitored for two years.A non-standard freeze-thaw experiment was performed which compares mortars containing SDA and fly ash (FA) and also shows the effect of superplasticizer.The possibility of improving the SDA by grinding has been tested and a limited improvement has been found. The strength of the mixed mortars seems slightly influenced by the grain size of SDAGypsum (CaSO4·2H2O), synthetic calcium-sulphite (CaSO3·½H2O) and 2 SDAs have been used as retarders for cement clinker. Mortar test prisms have been cast and comparative strengths after curing for 3 years are reported

scholarly journals Application areas of phosphogypsum in production of mineral binders and composites based on them: a review of research results

2018 ◽  
Vol 149 ◽  
pp. 01012 ◽  
Author(s):  
Leonid Dvorkin ◽  
Nataliya Lushnikova ◽  
Mohammed Sonebi
Keyword(s):  
Mechanical Properties ◽  
Blast Furnace ◽  
Blast Furnace Slag ◽  
Setting Time ◽  
Industrial Wastes ◽  
Cement Clinker ◽  
Complete Replacement ◽  
Slaked Lime ◽  
The Impact ◽  
Furnace Slag

The increase of the consumption of gypsum products in construction industry with a limited amount of natural gypsum deposits requires alternative sources of gypsum-containing raw materials. In some countries which have fertilizers industry plants, the problem can be solved using industrial wastes, e.g. phosphorgypsum – a byproduct of fertilizers’ production. Kept in dumps over decades, phosphorgypsum is subjected to the chemical changes due to washing out impurities with rain and other natural factors. However, there are observed deviations of harmful impurities in dumped PG depending on its age., Phosphorgypsum of any age requires chemical treatment to neutralize remains of phosphorus and sulfuric acids, fluorine compounds. According to our researches one of the most simple and effective method of neutralization the impurities is using lime-containing admixtures. The paper presents results of laboratory tests of phosphorgypsum as a component of clinker and non-clinker binders. There were investigated the impact of phosphorgypsum as admixture for clinker binders to substitute natural gypsum. Neutralized phosphorgypsum can be applied as mineralizing admixture in calcination of Portland cement clinker. Adding 2 to 2.5% of phosphorgypsum as setting time regulator resulted in a similar physical and mechanical properties compared to mix made with natural gypsum. Another important area of phosphorgypsum application is sulphate activatoion of low-clinker blast-furnace slag cement (clinker content is less than 19%). According to results, the incorporation of phosphorgypsum as sulphate activator in cement has the better effect as natural gypsum. Other development has been carried out to modify the phosphorgypsum binder properties. Complex additive consisted of polycarboxylate-based superplasticizer and slaked lime permitted an increase mechanical properties of hardened phosphorgypsum binder due to significant a reduction of water consumption. Such modified binder can be used as partial or complete replacement of gypsum binder for filling cements and finishing plasters. It can substitute gypsum in non-clinker binders like supersulphated cements. There were also developed compositions of supersulphated cements based on low-alumina blast furnace slag and phosphorgypsum. Supersulphated cements were tested in normal-weight and light-weight concrete.

scholarly journals Optimization of an Eco-Friendly Hydraulic Road Binders Comprising Clayey Dam Sediments and Ground Granulated Blast-Furnace Slag

Buildings ◽  
2021 ◽  
Vol 11 (10) ◽  
pp. 443
Author(s):  
Selma Bellara ◽  
Mustapha Hidjeb ◽  
Walid Maherzi ◽  
Salim Mezazigh ◽  
Ahmed Senouci
Keyword(s):  
Blast Furnace ◽  
Blast Furnace Slag ◽  
Setting Time ◽  
Road Construction ◽  
Cement Clinker ◽  
Partial Replacement ◽  
Industry Waste ◽  
Impact Reduction ◽  
Compressive And Flexural Strengths ◽  
Furnace Slag

This study investigated the potential use of Zerdezas dam Calcined Sediments (CS) and El-Hadjar Blast Furnace Slag (GGBS) from northern Algeria as a partial replacement of cement (C) in normal hardening hydraulic road binders. Two binder mix designs were optimized using a Response Surface Methodology (RSM). The first mix, 50C35GGBS15CS, consisted of 50% cement, 35% blast furnace slag, and 15% calcined sediment. The second mix, 80C10GGBS10CS, consisted of 80% cement, 10% blast furnace slag, and 10% calcined sediments. The tests of workability, setting time, volume expansion, compressive and flexural strengths, porosity, and SEM were conducted to ensure that both mixes meet the standard requirements for road construction binders. The two proposed mixes were qualified as normal hardening hydraulic road binder. The reuse of the sediments will contribute to a better disposal of dam sediments and steel industry waste and to preserve natural resources that are used for manufacturing cement. It will also contribute to the environmental impact reduction of cement clinker production by reducing greenhouse gas emissions.

The Application of the Steel Slag in the Radiation Shield Heavy Concrete

2013 ◽  
Vol 743-744 ◽  
pp. 258-268
Author(s):  
Ru Guang Li ◽  
Sheng Yin Zhou ◽  
Kun Tian ◽  
Peng Yao
Keyword(s):  
Early Stage ◽  
Setting Time ◽  
Steel Slag ◽  
Water Requirement ◽  
Radiation Shield ◽  
Slag Powder ◽  
Steel Slag Powder ◽  
Different Content

The steel slag was broken into steel slag powders and sands. The performance of the radiation shield heavy concrete was studied in this work by mixing different content of steel slag sand and powder. The results showed that the water requirement of normal consistency and setting time increased with the increase of the content of the steel slag powder. The strength reduced in the early stage of the experiment. The strength increased firstly and decreased later. The optimal content of steel slag powder for strength was 20%. For the steel slag powder and sand, whether the concrete added one or two components, the concrete slump loss increased and strength reduced at 3 days. The steel slag powder and sand added into concrete improved the performance of the concrete effectively, solved the heavy aggregate subsidence and improved the concrete homogenous.

Periclase in chrome-magnesite lining of rotary kiln for firing cement clinker

Refractories ◽  
1962 ◽  
Vol 3 (3-4) ◽  
pp. 111-112
Author(s):  
M. Sh. Sharafiyev ◽  
G. V. Orlova
Keyword(s):  
Rotary Kiln ◽  
Cement Clinker

Effect of Anhydrite on the Early Hydration Performance of Rapid Setting and Hardening Belite Sulfoaluminate Cement

2017 ◽  
Vol 898 ◽  
pp. 1990-1995 ◽  
Author(s):  
Ming Zhang Lan ◽  
Bin Feng Xiang ◽  
Jian Feng Wang ◽  
Xu Dong Zhao ◽  
Xiao Ying Wang
Keyword(s):  
Compressive Strength ◽  
Setting Time ◽  
High Strength ◽  
Cement Clinker ◽  
Hydration Kinetics ◽  
Early Hydration ◽  
Free Lime ◽  
Calcium Sulfoaluminate ◽  
Setting Times ◽  
Rapid Setting

In order to investigate the early hydration behavior of rapid setting and hardening belite sulfoaluminate cements, the methods of X-ray Diffraction, Scanning Electron Microscope, Compressive Strength test and Setting Times test were used to identify and quantify the hydration kinetics and microstructure of this new-found cements in China. The results showed that the main mineral compositions of high belite sulfoaluminate cement clinker included calcium sulfoaluminate (4CaO·3Al2O3·CaSO4), belite (2CaO·SiO2), ferrite phase, free gypsum and free lime. It was found that not only the setting time and compressive strength but also the composition of hydration products were influenced by anhydrite to some extent. Meanwhile, a mass of AFt and AFm generated along with the hydration process at different ages, overlapped, crossed and penetrated through calcium silicate hydrate gel and aluminum oxide to form a relatively dense structure which could contribute to the high strength of cement.

Study on CaSO3 and CaO as Additives of Slag Cement

2013 ◽  
Vol 634-638 ◽  
pp. 297-301
Author(s):  
Guo Zhuo Gong ◽  
Shu Feng Ye ◽  
Jin Hong Li ◽  
Wen Fen Yang ◽  
Qiang Xie
Keyword(s):  
Flue Gas ◽  
Blast Furnace Slag ◽  
Setting Time ◽  
Cement Clinker ◽  
Slag Cement ◽  
Retarding Effect ◽  
Desulfurization Process ◽  
Main Components ◽  
Furnace Slag

CaSO3and CaO are main components in solid waste from flue gas semi-dry desulfurization process. A series of slag cements were prepared from cement clinker and blast furnace slag, in the process of which CaSO3 and CaO were added. The composition and macrostructure of the derived cements were studied in detail with the aid of XRD and SEM. Furthermore, the influence of amount of CaSO3and CaO on the mechanical properties and setting time for slag cement were evaluated, the mechanisms of which were also discussed. The results show that due to the formation of AFt and AFm in the hydration process, the CaSO3has an obvious setting retarding effect on the slag cement, and quality slag cement can be obtained when the amount of slag and CaSO3are 20% and 2%, respectively, the compressive strengths of which at 3, 7, 28 d are 30.8, 39.1, 53.7 MPa, and bending strengths at 3, 7, 28 d are 9.6, 10, 11.9MPa, respectively. Besides, CaO added which can play a role of alkali-activator for slag cement can not cause the soundness problem of slag cement.

Preparation of Sulfoaluminate Cement Using Industrial Waste Residue

2011 ◽  
Vol 396-398 ◽  
pp. 380-385
Author(s):  
Lei Wang ◽  
Ye Wang ◽  
Tian Hua Yang ◽  
Run Dong Li
Keyword(s):  
Mechanical Properties ◽  
Compressive Strength ◽  
Corrosion Resistance ◽  
Flexural Strength ◽  
Physical Properties ◽  
Industrial Waste ◽  
Sintering Temperature ◽  
Setting Time ◽  
Cement Clinker ◽  
Environmental Technology

Large amount of emissions from industrial waste residue to the environment has caused serious pollutions. Utilization way to using industrial waste residue preparing sulfoaluminate cement (SAC) is got much attention of scholars both at home and abroad. It summarized the present researches for preparation of SAC from industrial waste residue (IWR). Sintering temperature, mineral composition, physical properties (fineness, standard viscosity, setting time), mechanical properties (compressive strength, flexural strength) and corrosion resistance of cement clinker were analyzed. Preparation of SAC clinker using IWR is a very promising environmental technology.

scholarly journals Cementitious Behavior of Argon Oxygen Decarburization Stainless Steel Slag and Its Stabilization on Chromium

Crystals ◽  
2020 ◽  
Vol 10 (10) ◽  
pp. 876
Author(s):  
Ya-Jun Wang ◽  
Ya-Nan Zeng ◽  
Jun-Guo Li ◽  
Yu-Zhu Zhang
Keyword(s):  
Setting Time ◽  
Steel Slag ◽  
Water Requirement ◽  
Curing Time ◽  
Stainless Steel Slag ◽  
Supplementary Cementitious Material ◽  
Slag Powder ◽  
Steel Slag Powder ◽  
Argon Oxygen Decarburization ◽  
Hydration Characteristics

The study mainly aims at the potential of Argon Oxygen Decarburization Slag (AODS) as a supplementary cementitious material and explores the mechanisms of stabilization/solidification (S/S) of chromium in cement-based composite pastes. The basic cementitious parameters, such as water requirement, setting time, soundness, hydration characteristics, and strength indexes of composite binders, were examined through standard methods. The results showed that the most beneficial mineral phase in AODS for cementitious behavior was beta dicalcium silicate (β-C2S). The utilization of a higher AODS dosage in composite binders increased the water requirement and the setting time, while it decreased the hydration heat and the strength indexes. Although the AODS possessed limited cementitious properties, it conformed the Grade II steel slag powder qualified for concrete and cement. Sequential leaching tests were conducted targeting the leachability of chromium in the pastes with different AODS dosage and curing time. Results showed that with the lower AODS dosage and the longer curing time, the S/S efficiency for chromium leaching from the composite paste was better. Utilization of AODS as a cement substitute not only can recycle this solid waste and decrease the emission of CO2 concerning cement production, but also helps to effectively reduce the chromium leaching risk.

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