Production of Sulfur from Gypsum as an Industrial Byproduct
An overall bioconversion capacity of 11 kg/m3·d of gypsum and 1.2 kg/m3·d of dissolved organic carbon has been achieved in the two-stage bioreactor. ... all trend in SW- NE direction and drain ...
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Production and use of by-product gypsum in the construction industry
The chemical reactions resulting in the different gypsum by-products are given below: a) Phosphoric acid: Reaction between sulphuric acid and phosphorites. By-product: Phosphogypsum. Ca~ (PO&CaF~ + 10H$04 + 2OH20 + …
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Effective recovery of calcium and sulfur resources in FGD …
The reductive decomposition of FGD gypsum to calcium sulfide (CaS) is a crucial method for resource utilization. This study investigated the reduction roasting …
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Production of high-quality gypsum raw materials from
Possibility of obtaining high-quality gypsum products from phosphogypsums produced in sulfuric acid processing of the Khibiny apatite concentrate was examined. A variant of phosphogypsum processing including the sulfuric acid leaching of rare-earth elements and admixtures of phosphorus and fluorine compounds, neutralization of the …
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Preliminary Plant Design Of Gypsum Using Limestone And Sulfuric Acid
By establishing the gypsum industry in Indonesia, it is expected to meet the needs of gypsum in Indonesia Gypsum is production from the reaction between limestone (CaCO3) and sulfuric acid solution (H2SO4) 50% of weight in Continuous Stirred-Tank Reactor (CSTR) ) with the capacity of product 100,000 tons/year in the reactor at the operating ...
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The kinetics of the precipitation of gypsum, CaSO4·2H2O
Uncontrolled gypsum precipitation can also cause hardships during reverse osmosis processes; this issue was also addressed in the literature [9, 41, 42]. Gypsum precipitation as a side-product during the neutralization of some wastewaters was also investigated [3, 43]. From these examples, one may conclude that the precipitation …
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(PDF) Influence of operating parameters of calcium
The aim of the present work (Bard 2006) is to lay the basis of a process for the production of synthetic gypsum valuable in plaster industry, and precipitated from sulphuric acid and limestone ...
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Phosphate Industry: Gypsum Crystallization under the …
EXPERIMENTAL SECTION. Pure phosphoric acid and sulfuric acid have been used to prepare the following solutions: Solution 1: x% P2O5 et y% H2SO4 ; With: x Є 30,15 and y Є 2.5,1.5,1. Solution 2: 20% P2O5 ; Solution 3: 40% H2SO4. 250 ml of solution 1 was heated to 80°C in a jacketed reactor using a cryothermostat.
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Production of sulfur from gypsum as an industrial byproduct
An overall bioconversion capacity of 11 kg/m3·d of gypsum and 1.2 kg/m3·d of dissolved organic carbon has been achieved in the two-stage bioreactor. Biological sulfate reduction was investigated at the bench and pilot scales in order to determine optimum culture conditions and efficient strains of sulfate-reducing bacteria were selected by ...
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Preparation of gypsum with high purity and whiteness from …
Abstract. Phosphogypsum (PG) is a solid waste product generated during wet-process phosphoric acid production. Various impurities considerably reduce the …
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Author: Subject: sulfuric acid from gypsum CaSO4
posted on 16-6-2010 at 09:19. sulfuric acid from gypsum CaSO4. Also, came up with an industrial process for producing sulfuric acid from common and inexpensive gypsum (CaSO4). An old chemistry book I had said that scientists couldn't find a commercially viable process for turning this potential resource into the highly useful acid …
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Relative Order of Sulfuric Acid, Bisulfate, Hydronium, and …
Sulfuric acid (H2SO4), bisulfate (HSO4–), and sulfate (SO42–) are among the most abundant species in tropospheric and stratospheric aerosols due to high levels of atmospheric SO2 emitted from biomass burning and volcanic eruptions. The air/aqueous interfaces of sulfuric acid and bisulfate solutions play key roles in heterogeneous …
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Synergistic leaching of valuable metals from spent Li-ion …
DOI: 10.1016/j.cej.2020.124321 Corpus ID: 213781527; Synergistic leaching of valuable metals from spent Li-ion batteries using sulfuric acid- l-ascorbic acid system @article{Chen2020SynergisticLO, title={Synergistic leaching of valuable metals from spent Li-ion batteries using sulfuric acid- l-ascorbic acid system}, author={Dongdong Chen …
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Rock chemical weathering by sulfuric acid: pathway, method …
To accurately define this sulfuric acid-based weathering and determine the consequence for global CO 2 sequestration, two key methods have often been used to identify the source of sulfuric acid in river water and calculate the proportion of sulfuric acid responsible for the net-release of CO 2.. 2.1 Forward modeling. The initial purpose …
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Application of Gypsum or Sulfuric Acid Improves
9 Citations. Explore all metrics. Abstract. This study evaluates the efficacy of applied amendments (gypsum and sulfuric acid, H 2 SO 4) to ameliorate clay loam soil …
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Effect of magnesium sulphate and sulphuric acid attack on …
Acidic solutions are the most destructive to concrete. Sulfuric acid attacks in two ways. first, the H 2 SO 4 reacts with hydration products such as C–H and C-S-H to form gypsum, and further in the second stage, ettringite (C6AS3H22 form due to reaction of tri-calcium aluminate hydrated (C 3 A) with gypsum [20].
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Recovery of Lithium, Iron, and Phosphorus from …
A selective leaching process is proposed to recover Li, Fe, and P from the cathode materials of spent lithium iron phosphate (LiFePO 4) batteries.It was found that using stoichiometric H 2 SO 4 at a low concentration as a …
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Kinetics of gypsum formation and growth during the …
The colemanite mineral with a particle size smaller than 250 μm were dissolved in sulfuric acid at different temperatures 60°C, 70°C, 80°C, and 90°C under vigorous stirring.In course of each dissolution process, concentrations of the boric acid and the calcium ion as well as the amount of the solid material in the reactor were determined …
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(PDF) Production of Gypsum from Clamshells and Waste Acid Recovered
The maximum result was shown in variation ratio of 35% calcined material, 50% aquadest and 15% sulfuric acid, with elapse time was 5.5 minute, load was 6.5430 lbs at compressive strenght test.
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Extracting lithium from the H2SO4 leaching solution of …
Among them, the sulfuric acid method has been used widely in lithium extraction from ore in consideration of its high selective lithium leaching [15]. Gu et al. once used medium-low temperature activation roasting and sulfuric acid leaching to achieve a maximum Li leaching rate of 86.23% [15].
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Effective recovery of calcium and sulfur resources in FGD gypsum …
1. Introduction. Flue gas desulfurization (FGD) gypsum mainly comes from thermal power plants, smelters, and boilers of large enterprises, and it is an industrial by-product produced in the wet desulfurization process [1], [2], [3].The main component of this gypsum is calcium sulfate dihydrate (CaSO 4 ·2H 2 O), which contains many Ca and S …
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making gypsum from li ne by crusher
making gypsum from li ne and sulfuric acid. USA Process and apparatus for producing gypsum That is the most suitable concentration of sulfuric acid is about 50 to 60 by a damper 30 to make smaller the particle sizes of the limestone to be separated and is returned to the sulfuric acid concentrator 1 or other sulfuric acid supply line
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Comparison of Gypsum and Sulfuric Acid for Sodic Soil Reclamation
This study evaluates the efficacy of applied amendments (gypsum and sulfuric acid, H2SO4) to ameliorate clay loam soil with different salinity and sodicity levels in rice and its adaptation ...
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Recovery elemental sulfur from calcium sulfide prepared by red gypsum
Sulfuric acid wastewater treated by calcium sulfide. XRD pattern of neutralized sulphuric acid sediment from calcined pure gypsum and RG are shown in Fig. 8. XRD pattern shows a significantly strong diffraction peak, corresponding to the bassanite phase (PDF: 41-0224, CaSO 4 ·0.5H 2 O), which gypsum was dehydrated to obtain …
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Thesis | Gypsum production and hydrochloric acid …
Gypsum production and hydrochloric acid regeneration by reaction of calcium chloride solution with sulfuric acid ... High strength HCl (= 4 M) was regenerated by the reaction of (3.5 M) CaCl2 leach solutions with (8 M) sulfuric acid in the temperature range of 20-60°C. Acid addition in stages to simulate the titration procedure, seeding and ...
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Continuous Precipitation of Calcium Sulfate …
Scanning electron micrographs of gypsum crystals taken from a lime suspension (100 g dm−3) and 23% waste sulfuric acid solution after: (A) 15 min at 60 °C, (B) 15 min at 80 °C.
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Sustainable Approach for Recovery of Sulfur …
A new sustainable method that consists of using sulfuric acid is proposed to process the Algerian phosphogypsum to recover the sulfur, which is imported in huge quantities until today. The ...
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Efficiency of Sulfuric Acid, Mined Gypsum, and Two Gypsum …
In the sodic-soil reclamation experiment, FIRs were 0 (nonamended), 8 to 9 (gypsum-materials), and 17 (sulfuric acid) mm h −1. All amendments were effective in crusting prevention and soil reclamation, but sulfuric acid was the most efficient due to the fastest EC and Na reductions in the leachates.
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Review The sulfur recovery from gypsums with a higher …
The sulfur recovery from gypsums with the carbon abatement is achieved. •. A value-added syngas byproduct with a higher H 2 /CO is simultaneously generated. •. An integrated …
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RECOVERY OF SULPHUR FROM WASTE GYPSUM
The reaction of gaseous CO2 with the CaS slurry leads to the stripping of sulphide to form H2S gas and the precipitation of CaCO3. The H2S generated was then reacted with SO2 in the PIPco processes to form elemental sulphur. Sulphur with the purity between 95% and 99% was recovered from waste gypsum in this study. 1. INTRODUCTION.
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