Industrial Lime Research Articles

Effect of the combination of two types of fish feed with nutritional quality on the performance of two species of fish raised on rural and peri-urban farms in Cote D'ivoire

For 160 days, juvenile Oreochromis niloticus and Heterobranchus longifilis were in ponds on a farm in San Perdo located in the southwest of Côte d’Ivoire.The juveniles grouped in four lot per species and in triplicate were fed in pairs of industrial feed and feed produced on the farm and an agri-feed by-product from four feeding techniques (Batch 1: juveniles fed with an industrial lime in the pre-growing phase followed by an agricultural by-product in the growing phase. Batch 2: Juveniles fed with an industrial feed then a feed formulated with an agricultural product during the growing phase ; Batch 3: juveniles fed with an agricultural by-product in the pre-growing phase followed by an industrial feed in the growing phase. Batch 4: Juveniles fed with a formulated feed in the pre-growing phase then with an industrial feed in the growing phase). At the end of the experiment, the best zootechnical parameters were obtained whatever the species by the juveniles fed in the pre-grossing phase with a produced feed followed by industrial feed in the production growing phase.

Evaluation of the incorporation of artisanal lime into the composition of stabilized earth blocks

This study evaluates the incorporation of artisanal lime into the composition of Stabilized Earth Blocks (SEB) to enhance local materials and minimize the use of cement. The objective is to develop a sustainable approach that utilizes available resources while meeting construction needs. The physico-mechanical behavior of the SEB was examined through a mixed chemical stabilization method (cement/lime), gradually replacing cement with artisanal lime. The main parameters analyzed include the replacement rate and the nature of the stabilizer, allowing for an in-depth understanding of the effects of this integration. The results indicate that replacing 12.5% of the cement with artisanal lime improves the long-term physico-mechanical properties of the SEB, particularly in terms of density, absorption, porosity, as well as compressive and flexural strength. Furthermore, this approach supports the transition towards more environmentally friendly construction practices. Additionally, the study includes a comparison of the results obtained using industrial lime, thus reinforcing the relevance of using lime in construction.

Applying industrial side streams in the neutralization of acid generating sulfide-rich sediments – The impact on pH and leaching of harmful elements

Acid sulfate soils can cause severe environmental harm due to a low pH and mobilization of harmful elements. Acid sulfate soil material is formed when oxidation of sulfide minerals causes a drop in pH to <4.0 for mineral oil materials and <3.0 for organic soil materials or when the soil materials contain enough sulfide to potentially do so.Two dredged, acid sulfate soil materials from Finland were used in this laboratory study. Chemical analyses were performed to determine the pre-incubation characteristics of both fresh dredged sediment samples and oxidized samples after 23 weeks of incubation. Total element concentrations were determined after digestion in aqua regia by ICP-MS or ICP-OES. The leachable concentration of elements was determined by using the two-stage shaking test (method SFS-EN 12457-3). The leaching of harmful elements (Cd, Co, Ni, Mn, and Zn) was high in the acidified dredged spoil samples. Also, the leaching of S was high. The soluble concentration was dependent on total concentration, pH, and the mobility of the elements.During a 23-week oxidation period, the impact of various amounts of industrial side streams (alkaline ashes, industrial lime residues) as neutralizing agents on the acid-generating dredged sediments was investigated in the laboratory. Calcite was used as a reference material. pH measurements were carried out during the incubation period. The leaching of elements was determined with a modified method based on the SFS-EN 12457-2 standard before and after oxidation.The untreated dredged spoils and the samples treated with too low amounts of neutralizing agents, acidified to pH < 4 during the oxidation period. Thus, harmful elements were leached out. However, the 100 % theoretical calculated neutralization need was suitable to prevent acidification and thus the leaching of harmful substances from the neutralized acid-generating dredged spoils. However, the leaching of Mo increased at neutral pH values. The results showed that industrial side streams can be applicable for the neutralization of acid sulfate soil materials. However, the legislation must also be considered.

Characterizations of Lime Sludge from Indian Paper Industry: A Step towards Sustainable Growth for Indian Cement Industry

The kraft process of wood into wood pulp in the paper and pulp industry in the chemical recovery section generates lime sludge (LS) through the burning of the lime kiln. This by-product lime sludge from the paper industry has the major chemical composition of calcium carbonate in the form of calcite, moisture and minors are silica, magnesium, iron and aluminium. Here, we characterized the collected industrial lime sludge by-product from different parts of the country and evaluated its potential application in engineering construction material. The chemical composition of all samples contains CaO in around (52-55) %, SiO2 (1-4) %, Al2O3 and Fe2O3 make up less than 1% by weight. Minor alkalis of Na2O, K2O and SO3 content are less than 1 wt%. XRD profile and TG/DTA results showed that all lime sludge samples have major calcite (CaCO3) phase. The particle size distribution showed that grains are in the range of 11μm to 23μm which is compatible for cement manufacture and construction. Investigation by optical microscopy of microstructure and morphology revealed that calcite grains are presents as rounded shape agglomerated form. The characterization of all obtained results are encouraging for replacement of limestone in the cement and construction industry by using lime sludge which is technically suitable and economically viable for waste management in favour of circular economy.

Mechanical and Environmental Performance of Eggshell Lime for Expansive Soils Improvement

Efficient and environmentally friendly alternative binders for expansive soils improvement are needed to practice sustainable geotechnics. This study evaluates the viability of a lime produced from eggshell waste as a green stabilization binder for expansive soils. Three contributions to the literature were achieved: (i) a comparison of the swelling, strength, stiffness, plasticity, and morphology of expansive soils stabilized with hydrated eggshell lime and hydrated industrial lime (i.e. commercially available lime), (ii) a statistical analysis of lime stabilization for swelling control and (iii) a life cycle assessment of eggshell lime versus industrial lime. Free-swell, unconfined compression, stiffness and Atterberg limits tests, and environmental assessment were performed to analyze the bentonite-kaolin-lime blends. Different proportions of bentonite-kaolin, dry density, lime content, and curing time were evaluated. Swelling data was correlated with the porosity/lime index. Results indicate that the alternative binder is a suitable option to improve the mechanical and swelling behavior of expansive soils, presenting higher strength and a reduction in expansion for all analyzed conditions, when compared to the industrial lime. Statistical analyses showed that bentonite content, lime content and dry unit weight factors should be focused for swelling reduction. For both studied limes, the adjusted porosity/lime index was an appropriate parameter to evaluate the swelling of stabilized soils. Life cycle assessment revealed that the alternative binder is a sustainable option as it avoids limestone mineral extraction and improvement.

Study on the Development of Spiral babylonia snail Tiger Snail Juvenil Eggs (Babylonia spirata Linnaeus, 1758) in the Laboratory

Several marine gastropods are known to have high economic value, one of which is the Spiral babylonia snail. They commonly exploited for meat, shell, or operculum. Tiger snail meat is commonly exported and consumed by fishermen. Its shell is used as a material for industrial lime and for omamen. Operculum is commonly used as a medicinal and perfume ingredient). However, the recent production has decreased due to the limited information of seasonal catch. One way to overcome these obstacles is through culture activities. The provision of seeds is an important link in the culture system, therefore the study of the spawning process and larval development is an important requirement for the development of larval rearing techniques. This study aims to determine the development process of juvenil eggs and the survival rate of tiger snails reared in the laboratory.. The study was conducted at the Laboratory of Marine Farm Subdivision in Kudus, Pt Pura Bahari, Jepara Regency. This sudy used experimental method with descriptive data analysis. Adult tiger snails were caught from Bunga waters, Demak. The snails were reared in a rectangular tube filled with 15 cm filtered sea water and 5 cm of sand. Egg capsules were reared in a 4 liters circular tube with continuous aeration. The hatched larvae were reared in a 300 liters circular tube filled with filtered seawater, continuously aerated and fed with Chlorella plankton . Our result showed that tiger snails spawn naturally and produce egg capsules. The incubation period for the capsule is 6 days, then develop into veliger larva for 12 days. The veliger larvae metamorphosed,and become juvenil. The lowest survival rate observed in the veliger stage. The survival rate of the egg and the intracapsular trochopore stages were quite high (tube I = 98.413%; tube II = 98.238%; tube III = 90.476%), then the lowest was in the veliger stage (tube I = 3,468%; tube II = 2.603%; tube III = 2,598%) and the juvenil stage is quite high compared to the previous phase (tube I = 3,413%; tube II = 2,479%; tube III = 2,351%).

Chemical and Microbiological Quality of Traditional and Industrial Lime Juice Produced in Kashan, Iran

Background: Lime juice is a nutritious drink, which is generally consumed for its' refreshing properties, nutritive value, vitamin content, and health benefits. Therefore, the chemical and microbiological quality of the traditional and industrial lime juice produced in Kashan city was assessed. Methods: In this descriptive cross-sectional study, a total of 106 samples were collected and screened for total soluble solid (TSS), pH, acidic value, protein content, mold, yeast, and count of acid-tolerant bacteria according to the Institute of Standards and Industrial Research of Iran (ISIRI). Results: Of the total samples, 66 samples (62.26%) were within the Iran’s national standard range. Most samples that did not meet the national standard requirements, were related to traditional samples (70.24%) compared to industrial samples (31.82%, P &lt; 0.001). No significant difference was found between pH and protein of traditional and industrial lime juice samples (P &gt; 0.05), while TSS and acidic values in traditional lime juices were less than those of the industrial lime juice (P &lt; 0.05). Additionally, the mold and yeast contaminations in traditional lime juices were more than industrial lime juices (P &lt; 0.05). Conclusion: In overall, traditional lime juice samples had the most microbial and chemical contaminations. It is necessary to increase the regular monitoring by relevant organizations over quality of the produced lime juices.

Trace elements retention in bottom ashes during coal combustion with hydrated lime additions

ABSTRACT Trace elements (TEs) content in coal, industrial hydrated lime, and bottom ashes from coal combustion and coal with hydrated lime additions were studied in this article. The favorable effect of hydrated lime (HL) addition to coal on TEs retention in ashes was reported for As, B, Co, Li, Mo, and V. However, at the same time, less Cu, Ni, Pb, and Sr were retained in the ash. An experimental studies results was supplemented with thermodynamic equilibrium calculations performed in Factsage software. Based on calculations, it has been shown that addition of HL to coal: (i) reduces formation of liquid slag phase containing, among others, TEs in the following form: As2O3(l), CoO(l), Cu2O(l), NiO(l), PbO(l) and ZnO(l); (ii) favors retaining As, B, Mo, and V in ash, as a result of stable components formation: Ca3(AsO4)2(s), Ca3(BO3)2(s), CaMoO4(s) and Ca3(VO4)2(s). Interestingly, most of the arsenic in the ash was trapped in Ba3(AsO4)2(s).

SOME PHYSICAL AND CHEMICAL PROPERTIES OF SOIL AFFECTED BY THE APPLICATION OF DIFFERENT SOURCES OF LIME IN ABUJA, NIGERIA

A field experiment was conducted at University of Abuja Teaching and Research farm, F.C.T-Abuja, Nigeria to determine the effects of different sources of lime on soil properties. The experiment was laid out in a Randomized Complete Block Design (RCBD) in factorial fashion comprising six treatments replicated three times. The treatment includes two types of industrial lime (ultrasol - V1 and agricultural lime – V2) applied at three different levels. Data collected from the study were analyzed using Analysis of Variance (ANOVA) and means were separated with Duncan’s New Multiple Range Test (DNMRT). The result obtained showed a high significant effects of treatments on soil chemical properties. The soil chemical properties were calcium (Ca), with the application of V2L1 (1000kg/ha) giving the highest value relative to other treatments and control. Soil exchangeable magnesium showed a significant effect in the control plot (V2Lo). Percent organic carbon and percent organic matter content in the soil were highly significant in plots treated with V1L2 (ultrasol lime at 2000kg/ha). Exchangeable potassium (k) and sodium (Na) produced the highest values in plots amended with V1L1 (ultrasol lime at 1000kg/ha) though not significant. Base saturation was increased though not significant in V2L1 (agricultural lime at 1000kg/ha) treated plot. CEC (Cation Exchange Capacity) increased in the V2L0 (agricultural lime at 0kg/ha) but was not significant. Exchangeable acidity reduced greatly in V1L2 and V2L1 treated plots. Electrical conductivity in the soil and percent total nitrogen showed no significant difference but produced the highest values in plots amended with V1L1. Manganese (Mn) and copper (Cu) in the soil were influenced by treatments with the lowest values in plots treated with V2L2 (agricultural lime at 2000kg/ha) though not significant. Iron (Fe) was reduced in plot treated with V1L0 (ultrasol lime at 0kg/ha) but was not significantly different. Zinc (Zn) was completely eliminated on the application of both agricultural and ultrasol limes. Available phosphorus had no significant influence on the amended plots and control. Soil pH (in water (H2O), potassium chloride (KCl) and in calcium chloride (CaCl2) showed no significant effect on treatments and control. Based on the following results, the use of agricultural lime (V2­­) and ultrasol lime (V1)­ both at 1000kg/ha and 2000kg/ha could be recommended for improving soil properties.

EFFECTS OF DIFFERENT SOURCES OF LIMING MATERIALS ON GROWTH AND DEVELOPMENT OF AMARANTHUS (Amaranthus hybridus) IN ABUJA, NIGERIA

A field experiment was conducted at University of Abuja Teaching and Research farm, F.C.T-Abuja, Nigeria to determine the effects of different sources of lime on growth of maranthus (Amaranthus hybridus). The experiment was laid out in a Randomized Complete Block Design (RCBD) in factorial fashion comprising six treatments replicated three times. The treatment includes two types of industrial lime (ultrasol - V1 and agricultural lime – V2) applied at three different levels. Data collected from the study were analyzed using Analysis of Variance (ANOVA) and means were separated with Duncan’s New Multiple Range Test (DNMRT). The result obtained showed a high significant effects of treatments on growth of Amaranthus (Amaranthus hybridus). Growth parameters such as plant height at 5 Weeks after Transplanting (WAT) had significantly higher value with the application of V1L2 (2000kg/ha) compared to other treatments and control. There was no significant effect on treatments and control at 2, 3 and 4WAT. Leaf count showed significant influence at 5WAT with the application of V1L1 (1000kg/ha), at 2 and 3WAT, there was no significant effect on treated plots and control. At 4WAT treatments had no significant effect on number of leaves. Plot treated with limes had no significant effect on Shoot Fresh Weight (SFW) at 4 and 5WAT. There was no significant effect on SFW at 2 and 3WAT. Shoot Dry Weight (SDW) showed a significantly higher value at 5WAT with V1L1 (1000kg/ha) compared to other treatments and control. At 4WAT control plot had a significant higher value on SDW. There was no significant effect on SDW at 4WAT with treatments. At 2 and 3WAT, SDW showed no significance difference on amended plots and control. Based on the following results, the use of ultrasol lime (V1)­ both at 1000kg/ha and 2000kg/ha could be recommended for improving growth of Amaranthus (Amaranthus hybridus).

Application of the response surface methodology to determine optimal conditions of castine calcination in a full-scale rotary kiln

ABSTRACT The optimisation of the calcination process in industrial lime kilns is of particular importance because it affects the final quality of the lime, coal consumption, and pollutant emissions. This work investigated the effects of different operating variables of a full-scale rotary kiln on the minimisation of unburned castine and reactivity of produced lime. The L8(27) Plackett-Burman's experimental plan was used for screening the significant variables on the calcination yield and the quality of the lime. Sequentially, Box-Behnken design approach, L15(33), under Response Surface Methodology (RSM) was used to determine the best combination of the variables optimising the calcination of castine. Quadratic models were developed to characterise the influence of selected significant variables, temperature of the smoke chamber (x 1 = 400, 500, and 550°C), kiln rotational speed (x 2 = 120, 90, and 70 s/revolution) and coal flow rate (x 4 = 0.5, 0.7, and 1.0 t/h), on the responses obtained. Under optimised conditions, the lime produced yielded 0.93% of unburned castine and a reactivity of 93.96°C, corresponding to the configuration: x 1 = 120, x 2 = 0.5, and x 3 = 550°C. Analysis of variance was conducted to assess the strength of evidence of the developed models. Good correlation coefficients were obtained for unburned castine (R 2 = 0.92, p < 0.031) and reactivity (R 2 = 0.96, p < 0.006), indicating that the models developed could be used to estimate castine calcination response.

Two-dimensional heat transfer analysis of timber structure walls filled with hemp-lime composite

Hemp-lime composite is a thermal insulating material used as a filling in timber frame construction walls. It is a material based on the wooden part of industrial hemp stalk (hemp shives) and lime binder. In practice, different wall thicknesses, composites with different thermal properties and various configurations of timber structure are used. These factors affect the temperature distribution in the wall. In the thermally weaker areas of walls, there is a greater risk of condensation and mould growth. This issue is important while designing walls based on organic materials. The paper presents the two-dimensional (2D) heat-transfer analysis based on the finite-element method, using THERM software. Several variants of external walls were adopted for the analysis. Thermal parameters of hemp-lime composites used in the analysis were obtained from our own research. The results of the analysis were presented as the values of the thermal transmittance coefficient and linear thermal transmittance equivalent to timber construction. The temperature distribution for an exemplary wall was also shown graphically in the form of isotherms and colour-flooded isotherms.

Thermal decomposition of the CaO in traditional lime kilns. Applications in cultural heritage conservation

It has been the aim of this paper to know the factors that most affect to the process of obtaining the quicklime in traditional lime kilns. To this end, a comparative study has been carried out between two quicklime types, one obtained in traditional lime kiln and another obtained in an industrial lime kiln. On the other hand, two limestone types, commonly used in the production of lime in these kilns, have been calcination in the laboratory. They correspond to an oosparite and oomicritic limestones, traditionally used in the elaboration of limes in the Morón de la Frontera region, Seville (Spain). The samples have been analyzed from the chemical, physical and mineralogical points of view. The calcination process of the limestones and the optimum heating temperature depends of the porosity and crystalline structure original of the limestones. The calcination temperatures, longer residence time and CO2 and steam pressure in the kilns affects the size and porosity of the CaO crystals. The quicklimes with greater volume of pores allow faster access of water to the interior of the material and consequently the lime slaking reaction is less exothermic. The size of the particles CaO affects the rate of the lime slaking reaction, accelerating the reaction when the particles are smaller. The quicklimes calcined in traditional kilns are characterized by greater particle and pore size and greater volume of mesopores.

A study of industrial lime sludge waste as filler in hybrid polymeric composites

Industrial lime sludge waste is an environmental hazard, which is usually disposed in dump yards causing pollution. This study aims to increase the viability of lime sludge (LS) by using it as filler in hybrid polymeric composites. Study of the mechanical properties of LS filled high density polyethylene (HDPE) and maleic anhydride grafted high density polyethylene (MAPE) revealed better properties of MAPE due to effective interfacial bonding at the filler-matrix boundary owing to the presence of maleic anhydride compatibilizer. LS also proved to be an effective reinforcing filler in case of short coir fibre - epoxy hybrid composites, thereby increasing their tensile strengths upon filler loading up to 9 wt %. LS improved thermal stability of the LS-coir-epoxy hybrid composites by increasing the thermal degradability and residual wt. %. However, it is observed that the addition of coir and LS in composites increased the water absorption rate of the composites significantly. Nevertheless, lime sludge proves to be an efficient filler in polymeric composites which would not only decrease pollution but also manufacturing cost of polymeric composites.

Industrial Lime Sludge waste–HDPE composites — a study of their mechanical, thermal, and morphological properties

Industrial lime sludge (LS) waste is an environmental hazard which is usually disposed in dump yards or used in disorganized land filling, thus causing pollution. The aim of the present work is to investigate whether the functionality and commercial viability of this industrial waste can be enhanced by utilizing the calcium carbonate (CaCO3)-rich LS waste as reinforcement in high-density polyethylene (HDPE) matrix. Mechanical, thermal, and morphological properties are studied by blending LS with HDPE in various weight fractions. It is observed that the flexural strength, tensile modulus, and flexural modulus increased significantly with the addition of LS in the polymeric matrix indicating effective reinforcement by rigid particulate filler. The onset thermal degradation temperature is also increased significantly upon LS addition, thus raising the thermal stability of the composites. Hence, the development of LS-reinforced HDPE composites can be considered as an effective way to enhance the properties of polymeric composites as well as to reduce pollution by recycling an industrial waste.

Evaluation of stearic acid modified industrial lime sludge waste as a filler in high density polyethylene composites

Abstract Industrial lime sludge (LS), an environmental hazard, is surface modified by stearic acid (SA) in order to reinforce high density polyethylene (HDPE) composites. Uncoated and SA-coated LS-reinforced HDPE composites are prepared and their mechanical, thermal, and morphological properties are studied and compared with each other. FTIR spectroscopy revealed successful grafting of SA onto LS particles while SEM morphology showed that SA coating hinders particle agglomeration in the HDPE matrix at higher filler loading. Mechanical properties such as tensile and flexural strength and modulus, elongation at break, and impact strength increased significantly for SA-coated LS composites due to uniform particle dispersion and effective filler-matrix interfacial interaction. The SA coating increased the entanglement at the filler-matrix interface thereby increasing the thermal decomposition of the coated composites from 500°C to 600°C. Additionally, it also reduced the water absorption rate of the coated composites in comparison with its uncoated counterpart. Thus, SA proves to be an efficient surface modifier for LS to produce HDPE composites with superior properties at a low cost. Needless to say, this study also suggests an alternative LS waste management route which offers benefits of reusing an industrial waste, decreasing the pollution, and developing fresh polymeric products.

Industrial waste derived CaO-based catalysts for upgrading volatiles during pyrolysis of Jatropha residues

Lime mud, the industrial waste from pulp and paper mills, was used as a raw material for preparing calcium oxide (CaO)-based catalysts. Lime mud was heated at 1000°C to transform it into active CaO and then modified by adding 5wt% Fe or Ni (as nitrates) using the wet impregnation method and calcining to form the Fe/CaO and Ni/CaO catalysts. The fast pyrolysis of Jatropha residues to bio-oil with no catalyst and with the derived CaO, Fe/CaO and Ni/CaO catalysts was studied using an analytical pyrolysis-GC/MS at 500°C at a biomass: catalyst ratio of 1:1 and 1:5. A Jatropha residue: catalyst ratio of 1:5 was more optimal for enhancing aliphatic hydrocarbon production and decreasing the amount of oxygenated and N-containing compounds. The presence of the CaO catalyst completely eliminated the undesirable acids and sugars in the bio-oil, significantly decreased N-containing compounds and considerably promoted the formation of aliphatic hydrocarbons up to 37.3%. The Fe/CaO and Ni/CaO catalysts further increased the selectivity for aliphatic hydrocarbons, and reduced aldehyde formation compared to with CaO, with Ni/CaO being the best catalyst for hydrocarbon selectivity (47.5%). Overall, these CaO-based catalysts derived from industrial lime mud waste can be used for catalytic fast pyrolysis applications.

Reusing industrial lime sludge waste as a filler in polymeric composites

Industrial lime sludge waste is an environmental hazard, which is usually disposed in dump yards causing pollution. This study investigates if the viability of lime sludge and polymer can be increased by using the CaCO3 rich lime sludge as a filler in HDPE-PP blends. It is observed in an experimental study that properties, such as hardness and thermal stability, are improved in the composites with the addition of lime sludge. Although the tensile strength of composites is less than that of pure polymers, the same is increased with increasing lime sludge weight fraction in the composites. Hence, using lime sludge as a filler in polymer blends would be an effective way of producing polymeric composites with enhanced properties and reduced cost.

On heat exchange - burning conditions relation in manufacturing lime in a rotary kiln

The work objective is to study the effect of the temperature lime burning conditions in a rotary kiln on the quality indices of the industrial lime used in the steelmaking. The methodology for studying the heat transfer conditions and the temperature behavior of the bulk material under the heat passage and temperature-waves propagation in the semibounded space of a rotary kiln is offered. It is shown that a system of equations describing boundary conditions of the limestone heating by the radiant heat flux becomes increasingly complicated in the case of the parallel convective heat transfer. To simplify the calculations, it is suggested to reduce the combined radiant and convective heat transfer to the convective one (in form) using the known criterial dependences. The investigation results of the heat transfer in the ‘flame - limestone’ system with testing apparent and optimum temperatures in the burning zone are presented. The thermal effect in the rotary kiln on the lime quality indices is specified experimentally under the laboratory and plant conditions. Conditioning of the slag adjustment by the lime consumption during the steel electrosmelting in an arc furnace is defined. Conclusions on the effect of the furnace thermal performance on the principle processes of the carbonate raw materials kilning in the industrial lime manufacturing are formulated. The optimal furnace temperature conditions for manufacturing quality lime with more than 90% CaO are specified.

Abatement of SO2–NOx binary gas mixtures using a ferruginous active absorbent: Part I. Synergistic effects and mechanism

A novel ferruginous active absorbent, prepared by fly ash, industrial lime and the additive Fe(VI), was introduced for synchronous abatement of binary mixtures of SO2–NOx from simulated coal-fired flue gas. The synergistic action of various factors on the absorption of SO2 and NOx was investigated. The results show that a strong synergistic effect exists between Fe(VI) dose and reaction temperature for the desulfurization. It was observed that in the denitration process, the synergy of Fe(VI) dose and Ca/(S+N) had the most significant impact on the removal of NO, followed by the synergy of Fe(VI) and reaction temperature, and then the synergy of reaction temperature and flue gas humidity. A scanning electron microscope (SEM) and an accessory X-ray energy spectrometer (EDS) were used to observe the surface characteristics of the raw and spent absorbent as well as fly ash. A reaction mechanism was proposed based on chemical analysis of sulfur and nitrogen species concentrations in the spent absorbent. The Gibbs free energy, equilibrium constants and partial pressures of the SO2–NOx binary system were determined by thermodynamics.