Rates Of Gypsum Research Articles

Assessment of Gypsum as a Soil Ameliorant on Salt-affected Soils in the Ho-Keta Plain of the Volta Region, Ghana

Aims: To assess the effectiveness of Gypsum as a chemical ameliorant on three selected salt-affected soils of the Ho-Keta plain, in the Volta region of Ghana.
 Study Design: Complete Randomized Design.
 Place and Duration of Study: Soil Research Institute, Kwadaso, Kumasi between June 2014 and July 2019.
 Methodology: Soil sampling was taken in two forms. The initial sampling was taken at a depth of 0-30 cm from Anyako, Anyenui and Atiehife for the soil physical and chemical analysis. Samples were further taken from profiles, composited and sub-sampled for the leaching experiment. Approximately 2.6 kg of the soil samples from the different sites were taken, mixed thoroughly with different rates 0%, 25%, 50%, 75% and 100% of Gypsum, (CaSO4.2H2O) and filled into fifteen perforated polyvinyl plastic pots and replicated four times. The pots were saturated with water, incubated for 24 h and leached intermittently with 120 mL distilled water for a period of four weeks.
 Results: Significant displacement of Na+ by Ca2+ and subsequently leached became evident in the reduced values recorded for pH, EC and SAR. The applied gypsum reduced pH within a range of 4.0 to 4.2 compared to the original soil with no significant differences among the treatments at p = 0.05. Though a similar trend was observed for EC, significant difference at p = 0.05 was observed at gypsum level above 50%. Sodium adsorption ratio recorded a marked difference as gypsum level was varied with significant difference at p = 0.05 compare to the control. 
 Conclusion: The study revealed that gypsum rates at 75% and 100% Gypsum requirement were effective in improving the chemical properties of the soils with significant reductions in salinity, sodicity and pH. Atiehife soil performed better compared to Anyenui and Anyako soils.

Field applications of gypsum reduce pH and improve soil C in highly alkaline soils in southern Australia’s dryland cropping region

AbstractHighly alkaline soils are widespread throughout south‐eastern Australia. High pH limits the accumulation and retention of organic carbon (C), and thus the availability of nutrients to crops and is also associated with various elemental deficiencies and toxicities that restrict crop productivity. Applying gypsum and increasing legume production reduce pH and improve soil chemical and physical properties in alkaline, sodic soils, but this strategy has not been explored in alkaline soils in the region where many of the topsoils are non‐sodic. Five short‐term rotation experiments were conducted to examine the potential to reduce pH, improve soil organic C and increase crop production. In the first year, three legumes—field peas (Pisum sativum), vetch (Vicia sativa) and a medic pasture (Medicago spp.)—were grown at low or high inputs of seed and fertilizer and with three rates of gypsum (0, 2.5 t/ha and 5.0 t/ha). In the following seasons, wheat (Triticum aestivum) and barley (Hordeum vulgare) were grown. Using high sowing and fertilizer rates to increase legume biomass had little effect on soil properties; however, applying gypsum consistently resulted in a lower soil pH and dissolved organic C and higher organic C compared with the unamended control to a depth of 0.20–0.30 m. The largest difference occurred with 2.5 t gypsum/ha with little further change at 5 t/ha. Gypsum significantly increased biomass and grain yield at sites with low concentrations of calcium carbonate. Low rates of gypsum may be effective in reducing pH, maintaining soil organic C and improving crop production in regions with alkaline soils low in calcium carbonate.

Wheat yield and changes in some major soil variables as affected by gypsum application in the Central Ethiopian highland agricultural soils

Field experiments were conducted in three locations: Arsi, East Shewa and West Shewa zones during 2014–16 aimed at exploring the influence of gypsum on wheat yield and soil properties. Results showed that gypsum application significantly increased wheat yield and affected soil composition. The applied highest rate of gypsum gave significantly higher wheat grain yield (**p < 0.01); and increased soil SO4-S and Ca2+ compared with the control variant (CK) and the lower gypsum rates. With applied highest rate of gypsum, grain yield advantage ranging from 93.3% at Berfeta Tokofa2, to 166.7% at Keteba2 sites compared with CK were obtained. While with applied nitrogen, percent grain yield advantages ranged from 68.8% at Wonji Gora, to 133.3% at Keteba2 sites compared with CK were obtained. The soil variables: sulfur, calcium, calcium saturation and saturation percent also showed dramatic changes after gypsum application. But, the contents of magnesium, potassium, sodium and phosphorus were reduced with the rate of gypsum applied. But, fertilizers urea and triple super phosphate (TSP) application increased soil phosphorus. Changes in soil pH due to gypsum were inconsistent or trendless. Overall, the significantly increasing wheat yield and enhanced soil composition signifies the role gypsum could play in organic farming in the country. However, as this was the on-farm experiment affected by multitude of factors, for proper recommendation and improvement of significance in the variables considered, it is therefore suggested that further works should be installed using controlled conditions and specialized laboratory techniques.

Micro-Water Harvesting and Soil Amendment Increase Grain Yields of Barley on a Heavy-Textured Alkaline Sodic Soil in a Rainfed Mediterranean Environment

This paper focuses on the adverse effects of soil sodicity and alkalinity on the growth of barley (Hordeum vulgare L.) in a rainfed environment in south-western Australia. These conditions cause the accumulation of salt (called ‘transient salinity’) in the root zone, which decreases the solute potential of the soil solution, particularly at the end of the growing season as the soil dries. We hypothesized that two approaches could help overcome this stress: (a) improved micro-water harvesting at the soil surface, which would help maintain soil hydration, decreasing the salinity of the soil solution, and (b) soil amelioration using small amounts of gypsum, elemental sulfur or gypsum plus elemental sulfur, which would ensure greater salt leaching. In our experiments, improved micro-water harvesting was achieved using a tillage technique consisting of exaggerated mounds between furrows and the covering of these mounds with plastic sheeting. The combination of the mounds and the application of a low rate of gypsum in the furrow (50 kg ha−1) increased yields of barley grain by 70% in 2019 and by 57% in 2020, relative to a control treatment with conventional tillage, no plastic sheeting and no amendment. These increases in yield were related to changes in ion concentrations in the soil and to changes in apparent electrical conductivity measured with the EM38.

Preparation of calcium ferrite by flue gas desulfurization gypsum

At present, the continuous accumulation of the flue gas desulfurization (FGD) gypsum in steel plants leads to the serious environmental issues and resource waste. To achieve green and sustainable development for the steel industry, it is significant to improve the usage of by-product gypsum. Employing the sintering FGD gypsum, ferric oxide, and graphite carbon as raw materials, the effects of the carbon content, reaction time, and molar ratio of CaO to Fe2O3 on the desulfurization rate of gypsum were studied based on the orthogonal experiment. The results show that the order of the three influencing factors on the desulfurization rate of FGD gypsum is: molar ratio of CaO to Fe2O3 > reaction time > carbon content. Under the optimal conditions of 20 wt.% carbon content, 4 h reaction time, and 1:1 molar ratio of CaO to Fe2O3, the desulfurization rate of desulfurization gypsum is 95.79%, and 97.57 wt.% of calcium ferrite appears in the solid product, which can be used as sintering additive to increase the economic benefits of enterprises and realize the green ecological development mode of internal generation and internal digestion of solid waste in iron and steel enterprises.

Soil chemical properties and crop response to gypsum and limestone on a coarse-textured Ultisol under no-till in the Brazilian Pampa biome

The primary aim of this work was to assess the effect of rates of gypsum used alone and in combination with limestone on (a) soil nutrient contents and acidity, and (b) soybean and maize yields, on a subtropical coarse-textured Ultisol with a low cation exchange capacity (CEC) under no-tillage (NT). For this purpose, a field experiment using different rates of gypsum (0.0, 0.5, 1.0, 2.0 and 4.0 Mg ha−1) with or without limestone at 2.0 Mg ha−1 was started in August 2013. The experimental design was completely randomized blocks with three replications. The soil was sampled in five different layers (0–5, 5–10, 10–20, 20–40 and 40–60 cm) after 52 months, and crop yield was assessed in the seasons 2014/2015 and 2016/2017 for maize, and 2015/2016 and 2017/2018 for soybean. Surface application of limestone increased soil pH and base saturation in the 0–10 cm soil layer without exceeding the critical levels or having a significant effect on crop yield. Gypsum only altered the concentration of exchangeable Mg2+ in the soil, which decreased with increasing Ca2+/Mg2+ ratio in the subsurface layers as the amendment rate was increased. As a result, gypsum reduced maize yield in the first harvest after application, possibly by making the soil deficient in Mg2+, and the negative effects on microbial biomass. No similar effect was observed in the subsequent years. Applying gypsum to soils with low CEC and acidity in the subsurface layers not only fails to increase crop yield but also may induce Mg deficiency.

Cover crops, lime and gypsum influence on soil physical attributes

Cover crops promote nutrient cycling, and lime and gypsum can alter the soil physical attributes. This study aimed to evaluate the effect of lime and gypsum rates applied to a no-tillage system with addition of residues of three cover crops on the soil physical attributes. This experiment was carried out in chapadão do sul-ms. The treatments were comprised of three cover crops (Urochloa ruziziensis, fallow, and Pennisetum glaucum), with gypsum (0, 2.3 and 4.6 Mg ha-1) and lime applied at a dose of 0, 2, 4, 6 Mg ha-1).The attributes evaluated were: soil density, macroporosity, microporosity, total porosity and penetration resistance. The soil of the experiment was classified an Oxisol. Cover crops and lime and gypsum improved macroporosity, microporosity and total porosity at all depths, 0-0.2 m. Millet presented lower values for penetration resistance with the lime application and without gypsum application. No residual effect on soil density was detected for lime and gypsum application or cover crops in the 0.1-0.2 m layer. Brazilian Cerrado producers will have a well-defined management system to follow aiming at improving the soil physical attributes.

Effects of gypsum, irrigation and tillage on a sodic Yellow Kandosol at Carnarvon, Western Australia

Context Kandosol soils are widely distributed in Australia and are frequently used for irrigated cropping. However, under intensive irrigated cropping they can degrade due to poor structural stability where surface soil aggregates break down as a result of slaking and dispersion; the slaking is associated with low soil organic carbon levels (&lt;1.0 g/100 g) on these frequently cultivated soils, and the dispersion is related to the moderate level of exchangeable sodium percentage (ESP) combined with low electrical conductivity (EC) levels in the soil solution. Aims To investigate the effects of applied gypsum (0, 2 and 10 t/ha), irrigation with water of low EC (0.5 dS/m) and low sodium adsorption ratio (≤2), and two tillage practices, i.e. conventional tillage (CT) and reduced tillage (RT), on the structure of a marginally sodic (ESP 6) Yellow Kandosol soil. Methods The experiment was conducted at Carnarvon, Western Australia. Key results After 2 years the soil EC (1:5) and ESP levels were significantly reduced on all plots at the three gypsum rates. The three gypsum rates also significantly affected exchangeable calcium (Ca) and magnesium (Mg) and soluble Ca and Mg levels, as well as pH and dispersion values. Micromorphological examination indicated less dispersed clay with gypsum application. Conclusions The EC results indicated that the soil will require frequent re-application of gypsum to maintain electrolyte levels and prevent dispersion. With some of the variables, RT compared to CT demonstrated greater through-flow, which was attributed to the presence of more macropores in RT. Implications A change in management from semi-arid chenopod shrublands used for grazing to intensely cultivated horticulture will require careful consideration of factors causing soil structural instability.

Black oat (

Context The effect of long-term gypsum on nitrogen (N) responsiveness in black oat (Avena strigosa Schreb.) forage lacks information. Aims and methods This study evaluated interactions between different rates of N (0, 50 and 100 kg N ha−1) and gypsum (0, 3, 6, 9 and 12 Mg ha−1) on the yield, nutrition and bromatology of forage black oats in a long-term experiment using a no-till system (NTS) in a Ferralsol in southern Brazil. Key results There was an interaction between residual gypsum and N rate on biomass forage yield in 2015, but not for the 2016 growing season. In 2015, the rate of 100 kg N ha−1 increased yield by 10% in the absence of gypsum and by 30% at low-medium rates of residual-gypsum (3 and 6 Mg ha−1), but there was no response to high N rate under high gypsum rates (9 and 12 Mg ha−1). In 2016, a poor-growing season, a gypsum rate of 6 Mg ha−1 and N rate of 100 kg ha−1 independently improved forage yield by 5%. Gypsum application produced higher forage contents of N, P, K, Ca and S, and decreased Mg content. N-fertilisation increased the N, K, Ca, and Mg contents, but decreased P content and S concentration. Gypsum had no effect on forage bromatological quality, and even with equivalent forage yield between 50 and 100 kg N ha−1, only the high N rate improved some of the forage quality attributes in both years. Conclusions and implications Neither gypsum nor topdressing of N altered N use by black oat forage.

High rates of agricultural gypsum affect the arbuscular mycorrhiza fungal community and coffee yield

ABSTRACT High rates of agricultural gypsum, above the recommended levels, have been used on a regular basis to deepen plant roots and to alleviate recurrent water stress in Cerrado areas. However, very little is known about the consequences of this practice to arbuscular mycorrhizal fungi (AMF). Therefore, the objective of this study was to evaluate whether or not applying high rates of agricultural gypsum affects the mycorrhizal fungi community, glomalin content and coffee yield. The study rates were: 0; 3.5; 7.0; 14 and 56 t·ha-1 of agricultural gypsum applied in the planting row of the coffee plantation on top of the previous recommended gypsum application. Samples were collected for analysis at the depths of 0-20, 20-40 and 40-60 cm at the end of dry and rainy seasons of the year. In the coffee plantation, 16 AMF species were identified. Gigaspora sp. and Glomus macrocarpum were dominant in all situations. The rate of 7 t·ha-1 favored greater diversity of AMF species and the rate of 56 t·ha-1 reduced AMF diversity and mycorrhizal colonization in deeper layers. In the rainy season, there was a linear decrease of easily extractable glomalin-related soil protein (EE-GRSP) levels as the agricultural gypsum rate was increased. Coffee yield was reduced with the highest gypsum rate (56 t·ha-1), even though the coffee plantation had higher phosphorus contents in beans and leaves. This may have resulted from a number of reasons, including a negative effect on the AMF community.

Modern Hydromorphism of Solonetzes in the Forest-Steppe Zone of Western Siberia

Soil salinization and alkalization is an acute problem in Western Siberia because of the rise of saline groundwater above the critical level. We studied modern hydromorphism of solonetzes in the forest-steppe zone of Western Siberia. The dynamics of the groundwater level were studied in the years with different moistening and during the growing seasons. The chemical composition of the groundwater was compared with the composition of salts in the soil water extracts to identify negative processes of soil salinization and solonetzization under the impact of groundwater. Field studies were performed on the plots of the long-term experiment on the effect of different gypsum rates on the properties of crusty solonetzes in Novosibirsk oblast. During the study, a sharp rise in the groundwater level took place in 2013; it resulted in an increase in the groundwater salinity and the amount of soluble salts in the solonetz profile in 2015–2016. An increase in the content of hypothetical soda in the profile of the solonetz was recorded. The results of this study may be used to monitor the state of soils in Western Siberia and to plan land reclamation measures during the development of virgin land and the return of abandoned fields into agricultural use.

Gesso em terras baixas: alterações químicas do solo e resposta do arroz irrigado e da soja

Estudos que avaliam a resposta dos cultivos agrícolas às modificações do solo com a gessagem são relativamente abundantes, mas concentrados majoritariamente em terras altas. Este trabalho objetivou avaliar a acidez e a disponibilidade de fósforo (P) e potássio (K) do solo e a produtividade do arroz irrigado e da soja, cultivados em terras baixas, com aplicação de doses de gesso agrícola. Os experimentos foram conduzidos em um Planossolo Háplico (Triunfo/Rio Grande do Sul). Os tratamentos consistiram em seis doses de gesso agrícola (0,00; 0,25; 0,50; 1,00; 2,00; e 4,00 t ha-1) e o delineamento experimental foi o de blocos casualizados. O solo foi coletado após a colheita das lavouras, nas camadas de 0–5, 5–10, 10–20 e 20–40 cm. O pH em água, a acidez potencial (H+Al) e o P disponível (Mehlich 1) não foram alterados com a aplicação de gesso agrícola. Após o cultivo de arroz irrigado e na camada de 0–5 cm, houve aumento do teor de K disponível (Mehlich 1) para doses até 1,00 t ha-1 e diminuição do teor para doses maiores (2,00 e 4,00 t ha-1). Após o cultivo de soja, o teor de K disponível não foi alterado com a gessagem. A aplicação de gesso agrícola não influenciou a produtividade do arroz irrigado e da soja na safra avaliada, onde não houve déficit hídrico.

How sulfate content and soil depth affect the adsorption/desorption of selenate and selenite in tropical soils?

Sorption of selenate (SeO 4 2- ) and selenite (SeO 3 2- ) is poorly understood in Brazilian agroecosystems, especially in soils from agricultural areas containing different contents of competing anions, such as sulfate (SO 4 2- ). This study aimed to assess the sorption behavior of selenate and selenite at different soil layers of a tropical soil treated with different rates of agricultural gypsum (thus, containing different contents of sulfate), collected under a coffee plantation. Soil samples from [...]

Effects of organic compost, gypsum, and topdress sulfur rates on bioactive compounds and physicochemical characteristics of collard greens

This study evaluates the use of sulfur, gypsum, and organic compost as to their effects on bioactive compounds and physicochemical characteristics of collard greens. Twelve treatments were assessed in randomized blocks in a split-plot scheme, where the main plots received three types of soil amendments (preplanting incorporation of organic compost; gypsum; and organic compost + gypsum), and the subplots received four rates of topdress-applied sulfur (0; 80; 160; and 240 kg ha-1 of S). Flavonoid bioactive compounds, total antioxidant activity, and total phenolic compounds were evaluated. The physicochemical characteristics assessed were: reducing sugars, total sugars, sucrose, soluble solids, pH, titratable acidity, fiber, protein, pigments (chlorophyll a, b, anthocyanins, and total carotenoids), and the relative chlorophyll index (SPAD index). The treatment whose soil was prepared with organic compost and a topdressing of sulfur from ammonium sulfate increased the flavonoid content in the collard plants. Gypsum application to soil increased the antioxidant activity in the collard leaves but, when combined with organic compost, it decreased the levels of phenolic compounds thereof. The rates of topdress-applied sulfur and the use of organic compost or gypsum in the soil, or the combination of both methods, did not affect the physicochemical characteristics and the pigments of commercial collard leaves. The use of organic compost combined with gypsum during soil preparation decreased the SPAD index in commercial collard leaves. The rates of topdress-applied sulfur showed no influence on the SPAD index in commercial collard leaves.

The damage mechanism and failure prediction of concrete under wetting–drying cycles with sodium sulfate solution

This study aims to investigate the damage mechanism and predict the failure time of concrete subjected to wetting and drying (WD) cycles in a sodium sulfate solution. To explore the growth rules and the growth rates of gypsum, the reaction-rate constant calculation formula of gypsum is proposed based on theories of chemical reaction kinetics. Subsequently, the formulae of the volume fractions of mirabilite and gypsum in the pore under each WD cycle are proposed and used to calculate the macroscopical tensile stress to determine the WD cycle number that the concrete can sustain. Finally, the reliability of the proposed model is verified by an indoor experiment. In addition, a new damage type of concrete, induced by filling-damaging cycles, is also found during the experiment. These findings can be used for evaluating the damage of concrete that is subjected to cyclic WD in sodium sulfate solution.

Synthesis of anhydrite from red gypsum and acidic wastewater treatment

One-step process of red gypsum leaching to produce anhydrite was proposed. The effects of sulfuric acid concentration, reaction temperature and reaction time on both the leaching rate of red gypsum, the phase and micro-morphology of the product were systematically investigated. The acid leaching solution was tried to use circularly. And the valuable components in the leaching solution were recovered by step precipitation. Anhydrous calcium sulfate powder with anhydrite crystal phase and smooth and serrate morphology was successfully produced. The leaching rate of red gypsum was 39.82% under optimized conditions. The optimum cycle number for the reuse of acid leaching solution was 5. Sulfate ions and iron ions in the leaching solution were recovered by adjusting the pH value. A preparation mechanism of anhydrite from red gypsum was also proposed by theoretical analysis. All of these indicated that the whole procedure setup showed potential application for red gypsum utilization.

Gypsum incubation tests to evaluate its potential effects on acidic soils of Colombia

Tropical soils are characterized by acidity and poor plant nutrient availability, limiting their agricultural productivity. These soils are commonly amended with lime, but its low solubility impairs its effectiveness to enhance soil fertility. The use of gypsum has gained attention among farmers due to its higher solubility and mobility in the soil, local accessibility, and low price. Therefore, this study was conducted to determine the effects of Agricultural Gypsum (AG) addition on ten Colombian acid soils that had poor fertility and contrasting their physical and chemical characteristics. Surface (0-20 cm) soil samples were air-dried, sieved (&lt;2 mm), and transferred into plastic vases, 40 g (dry base) per vase. Increasing rates of gypsum were added by duplicate: 0.0, 0.25, 0.5, 1.0, 2.0, 4.0, 8.0, and 16.0 g kg-1. Then, the soils were incubated for two weeks and watered to maintain 50% of their maximum water holding capacity. Soil pH, Al+3, Ca+2, Mg+2, K+, S-SO4-2, and P-H2PO4-2 were measured using standard methods. The results showed that AG addition significantly (P&lt;0.05) increased soil exchangeable Ca+2-K+, Ca+2 saturation, S-SO4-2 concentration, and exchangeable Al+3, particularly with doses above 4.0 g kg-1. In contrast, soil Al+3 saturation, P-H2PO4-2 and pH significantly decreased as the AG doses increased, while soil exchangeable Mg+2 levels were not significantly affected. The use of gypsum incubation tests could be promissory for its effects on soil amelioration associated mainly to increase soil exchangeable Ca2+ and S-SO 42- and to decrease Al3+ saturation.

Response of Barley Grown on Different Soils to Soil Amendments. استجابة الشعیر النامی فی أراضی مختلفة لبعض محسنات التربة.

This study was conducted to assess the effect of compost, agricultural gypsum and sugar beet mud (By-product in a sugar beet manufacturing process) on barley plants (Hordeum vulgare L) grown in pots containing saline clay or nonsaline sandy soil. For this purpose, three different rates of compost, gypsum and sugar beet mud (0.5, 1 and 1.5%, equivalent to 2.5, 5 and 7.5 g pot-1, respectively) were applied to both soils in pots 500 g soil and moisted two weeks before sowing. The used experimental design was a completely randomized design with three replicates for each treatment. Growth parameters (i.e. shoot fresh and dry weights (g plant-1) and No. of plants pot-1) and also elements concentration (i.e. N, P, K, Na, Mg and Ca %) were evaluated. The findings indicated that the obtained values significantly increased with the increase of adding rate of all soil amendments under study, where the highest values were realized due to the addition rate of 1.5% followed by 1% and 0.5%, respectively for all growth parameters and elements concentrations, except K% which suffered from antagonism with calcium that is included in the composition of agricultural gypsum and sugar beet mud. Also, barley grown in the control treatment (without any soil addition) appeared extremely nutrient deficient. Soil applications of compost, gypsum and sugar beet mud positively influenced on barley plants grown on saline and sandy soils. Also, sugar beet mud is beneficial for barley plants grown on studied degraded soils due to its high contents from calcium and organic matter.

Influence of Waste Gypsum on the Microstructural Characteristics and Strength Behavior of Unfired Mud Block

Construction technology in the twenty-first century is on the peak yet developing countries of the world still dream for shelter in bad weather conditions and apply old traditional techniques for construction of their houses. The reason is the increasing cost of construction materials due to energy crises, poor economic conditions, and sometimes the love of people toward earthen architecture culture. The world will prefer low energy alternatives to conventional construction. Some alternatives regarding conventional construction like mud block masonry are part of this research paper to avoid shrinking natural resources and take control of the energy crisis. This research work focuses on the compressive strength of the mud block by stabilizing it with additives like waste gypsum. The study also intended to investigate the rapid hardening of the masonry block. Finally, study the morphology of the stabilized blocks by using scanning electron microscopy and energy dispersive X-ray microanalysis (EDXMA). This research found that the compressive strength of waste gypsum-stabilized mud block at 7 days and 14 days increases with the increasing rate of waste gypsum from 0 to 20%. This research will help the poor community by reducing the economy and energy consumed in the construction of houses. Besides, this research will play a role by minimizing the consumption of natural resources, encourage people to reuse waste gypsum in construction without compromising on environmental pollution.

The mechanism of preparation calcium ferrite from desulfurization gypsum produced in sintering

This work investigated the reaction mechanism of preparing calcium ferrite by using desulfurization gypsum from sintering. The influence of ambient conditions, morphology, and raw material ratio on the formation of calcium ferrite was also studied. The utilization rate of gypsum in sintering was calculated, and the results showed that gypsum decomposition was the limiting factor in the reaction mechanism of calcium ferrite synthesis, the optimal raw material ratio for the formation of calcium ferrite was 30.4% desulfurization gypsum produced in sintering, 31.7% iron ore, 11.1% blast furnace dust, and 26.8% graphite. The optimal reaction conditions were achieved by heating the powdered materials at 1150 °C for 4 h under blowing argon gas atmosphere, resulting in the final product with a gypsum desulfurization rate of 98.9%. When the sulfur content in the sinter increased by up to 5%, 99% of the gypsum could be recycled. When the sulfur content in the sinter was doubled, 19.45 kg of gypsum was consumed per ton of sinter produced.