Recovery of Sulphur from Waste Gypsum
The basic steps of the sulphur recovery process from gypsum are: • Reduction of gypsum to calcium sulphide using reducing agents (Matsuya and Yamane, 1981), for example, coal or activated carbon (Eq (1)), CaSO 4(s) + 2C(s) Æ CaS(s) + 2CO2(g) (1) • Suspending the calcium sulphide obtained from Eq (1) in water to form a CaS slurryThe process evaluated consists of the following stages: reduction of gypsum to calcium sulphide; stripping of the sulphide with CO2 gas and the production of sulphur (PDF) Recovery of Sulphur from Waste GypsumThe biological sulphate reduction process is an alternative method for sulphate removal and recovery of sulphur and heavy metals from debris(PDF) Production of Sulfur from Gypsum as an A method for decomposition of phosphogypsum or natural gypsum, characterised in that it comprises mixing the said gypsum with natural sulphides in any suitable ratio and burning the resultingEPA1 Process for recovering sulphuric ) was to investigate and improve a biotechnological process that could economically cope with the disposal of industrial gypsum and its relatively expensive chemical reduction which requires a great deal of energy (reaction of gypsum with coal at 700 to 1200 °C to form CaO, CO 2 and SO 2 (4))PRODUCTION OF SULFUR FROM GYPSUM AS AN INDUSTRIAL BY
Method for the conversion of gypsum to elemental
Metal sulfates such as gypsum (calcium sulfate dihydrate) are processed to form sulfur dioxide The sulfur dioxide is contacted with carbonaceous matter at sufficiently high temperature to form elemental sulfur and carbon monoxide The carbon monoxide is then recycled for use as a reducing agent in the initial processing of the metal sulfateGypsum to calcium sulfide conversion of 835 and 838% was obtained at the optimum temperature range of 1100–1200°C and gypsum to calcium sulfide conversion of 854% was obtained at the optimum coal to gypsum mole ratio of 21:1, (iii) excess coal gave a lower conversion, and (iv) the predicted data using Mintek Pyrosim were found to be similar to the experimental dataThe gypsum reduction process and its validation The process evaluated consists of the following stages: reduction of gypsum to calcium sulphide; stripping of the sulphide with CO2 gas and the production of sulphur Thermal reduction study (PDF) Recovery of Sulphur from Waste GypsumThe process evaluated consists of the following stages: reduction of gypsum to calcium sulphide; stripping of the sulphide with CO2 gas and the production of sulphur Thermal reduction study showed that gypsum can be reduced to CaS with activated carbon in a tube furnace operating at 1100º C The CaS yield was 96%The recovery of sulphur from waste gypsumSulfur oxyanions (eg sulfate, sulfite) can be removed from aqueous waste and process streams by biological reduction with a suitable electron donor to sulfide, followed by partial chemical or (PDF) Production of Sulfur from Gypsum as an
RECOVERY OF SULFUR FROM GYPSUM CITIES
Techniques of this general type are mentioned in the Burwell US Pat No 2,740,691 This patent teaches the reduction of gypsum with a reducing gas stream at temperatures of from 890°C to about 1,000° C Burwell's process results in the recovery of the sulfur values from the gypsum essentially in the form of hydrogen sulfide) was to investigate and improve a biotechnological process that could economically cope with the disposal of industrial gypsum and its relatively expensive chemical reduction which requires a great deal of energy (reaction of gypsum with coal at 700 to 1200 °C to form CaO, CO 2 and SO 2 (4))PRODUCTION OF SULFUR FROM GYPSUM AS AN INDUSTRIAL BY 20012021 Gypsum waste disposal sites are responsible for the leaching of saline water into surface and underground water The aim of this investigation was to evaluate a process for converting waste gypsum into sulphur and calcium carbonateRecovery of sulphur and calcium carbonate from The process for sulfur recovery according to claim 7 wherein said sulfide is calcium sulfide and said heating step includes heating said sulfide and said oxidizing agent to a temperature of from about 1700° F (816871° C) being preferred The gypsum reduction is carried out in any suitable reactor, Method for the conversion of gypsum to Gypsum to calcium sulfide conversion of 835 and 838% was obtained at the optimum temperature range of 1100–1200°C and gypsum to calcium sulfide conversion of 854% was obtained at the optimum coal to gypsum mole ratio of 21:1, (iii) excess coal gave a lower conversion, and (iv) the predicted data using Mintek Pyrosim were found to be similar to the experimental dataThe gypsum reduction process and its
Effect of elemental sulfur and gypsum application
20032019 The two sulfur forms were elemental sulfur (S 0) and gypsum, both of which were applied at 0, 015, and 030 g S kg −1 soil, for a total of five treatments The results showed that both S 0 and gypsum significantly increased rice biomass compared to The Sulfur Cycle These are often termed as follows: Assimilative sulfate reduction (sulfur assimilation) in which The Sulfur Cycle Assimilative sulfate reduction (sulfur assimilation) in which sulfate (SO 4 2–) is reduced to organic sulfhydryl groups (R–SH) by plants, fungi and prokaryotesThe Sulfur CycleThe Sulfur CycleThe process evaluated consists of the following stages: reduction of gypsum to calcium sulphide; stripping of the sulphide with CO2 gas and the production of sulphur Thermal reduction study showed that gypsum can be reduced to CaS with activated carbon in a tube furnace operating at 1100º C The CaS yield was 96%The recovery of sulphur from waste gypsum) was to investigate and improve a biotechnological process that could economically cope with the disposal of industrial gypsum and its relatively expensive chemical reduction which requires a great deal of energy (reaction of gypsum with coal at 700 to 1200 °C to form CaO, CO 2 and SO 2 (4))PRODUCTION OF SULFUR FROM GYPSUM AS AN INDUSTRIAL BY The process evaluated consists of the following stages: reduction of gypsum to calcium sulphide; stripping of the sulphide with CO2 gas and the production of sulphur Thermal reduction study showed that gypsum can be reduced to CaS with activated carbon in a tube furnace operating at 1100 ºC The CaS yield was 96%CiteSeerX — RECOVERY OF SULPHUR FROM
The gypsum reduction process and its
Gypsum to calcium sulfide conversion of 835 and 838% was obtained at the optimum temperature range of 1100–1200°C and gypsum to calcium sulfide conversion of 854% was obtained at the optimum coal to gypsum mole ratio of 21:1, (iii) excess coal gave a lower conversion, and (iv) the predicted data using Mintek Pyrosim were found to be similar to the experimental data20032019 The two sulfur forms were elemental sulfur (S 0) and gypsum, both of which were applied at 0, 015, and 030 g S kg −1 soil, for a total of five treatments The results showed that both S 0 and gypsum significantly increased rice biomass compared to Effect of elemental sulfur and gypsum application 08051996 Currently, gypsum and pyrite, two major wastes generated by the coal combustion industry, have to be landfilled The feasibility of a new approach of recovery of lime, iron, and sulfur products from these wastes is discussed in the present work By thermal decomposition of pyrite, 42% of the sulfur is recovered and pyrrhotite is producedRecovery of Lime, Sulfur, and Iron from Gypsum The Sulfur Cycle These are often termed as follows: Assimilative sulfate reduction (sulfur assimilation) in which The Sulfur Cycle Assimilative sulfate reduction (sulfur assimilation) in which sulfate (SO 4 2–) is reduced to organic sulfhydryl groups (R–SH) by plants, fungi and prokaryotesThe Sulfur CycleThe Sulfur CycleAlkalis (mainly sodium and potassium), sulphur and chloride are minor components in the raw materials used for clinker production Depending on the sources of the raw materials, the concentrations of alkali and sulphur can be up to 1–2 %, while chloride can be up to around 03 %Dynamic simulation of alkali, sulphur
Gypsum Processing FEECO International Inc
Gypsum can be a difficult material to process, from its variability, to its tendency to harden into a cementlike form, and its abrasive nature For this reason, choosing processing solutions that are heavyduty and designed around the unique characteristics of the gypsum Sulphur removal in the ironmaking and oxygen steelmaking process is reviewed A sulphur balance is made for the steelmaking process of Tata Steel IJmuiden, the Netherlands There are four stages where sulphur can be removed: in the blast furnace (BF), during hot metal (HM) pretreatment, in theSulphur removal in ironmaking and oxygen steelmaking
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