There are some industrial gypsum-bearing wastes such as by-products from citric acid production, phosphate fertilizers, the coal combustion flue gas desulfurization process, etc. that can be recycled and used as a substitute for natural gypsum [11,15,16,17]. Very little research has been conducted to analyze the environmental impact of using RG ...
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Domestic Production and Consumption of Citric Acid in 2019 . Trade & Tariffs . Worldwide Trade . Worldwide import and export data for citric acid are reported through the World Bank's World Integrated Trade Solutions (WITS) software, as a category specific to citric acid. In 2021, the U.S. ranked tenth worldwide in total
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A field trial experiment was carried out during the winter season of 2010/2011 to investigate the effect of different amendments i.e. gypsum, citric acid, farmyard manure, compost and the combination among them on heavy clay salt-affected soil irrigated with wastewater and also, their effects on wheat production.
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Fig. 1 (a) and (b) show that all eight kinds of retarders play different degree on setting times for building gypsum, among which citric acid demonstrates the most significant retarding effect, followed by sodium tripolyphosphate. When the dosage of citric acid is only 0.1%, the initial setting time of gypsum has been >60 min, i.e. a stronger ...
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Submerged fermentation is found to be responsible for around 80% of global citric acid production. Higher yields and cheaper labor costs are two advantages of submerged fermentation for citric acid manufacturing (Roukas 1991).The kind of material utilized to construct the fermenter, as well as the aeration, are two elements that are very important to be …
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When referencing synthetic gypsum, most people are likely referring to FGD gypsum. However, there are small quantities of synthetic gypsum created through various acid-neutralizing industrial processes. These additional types of …
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Citric acid increases the fluidity of recycled gypsum plaster. Retarding effects are higher with high content of the admixture. Mechanical properties are diminished with the …
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The salt is redissolved in sulfuric acid, releasing citric acid in solution and gypsum. The gypsum (Citrogips ®) is separated by filtration, and the decomposed citric acid solution is further purified using ion exchange, activated carbon, and …
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The role of citric acid, a retarder additive used to prolong the workability and setting time of gypsum binders, was studied at concentrations of 0, 125, 250, 500, 1000, 1500 and 3000 ppm with a constant water/binder ratio.The hydration process (setting) was studied by the knife method, conductivity measurements and attenuated total reflectance infrared spectroscopy, …
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Raising demand for alumina worldwide has increased the rate of bauxite residue production. ... a combination of sulfuric acid and gypsum, citric acid, a hybrid of citric acid and gypsum) were conducted to provide a statistically valid data set. After equilibration, the supernatants were centrifuged for 20 ...
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Lemon juice continued to be used as the commercial resource of citric acid until 1919, and the first industrial production using Aspergillus niger began when it was found to have the capacity to ...
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Citric acid gypsum (CAG), a by-product from citric acid production processes, rich in calcium sulfate dihydrate, emerged during the reaction of precipitated calcium citrate with sulfuric acid in the calcium salt method.
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Citric acid acts as a retarder of gypsum plaster hydration only in presence of other cations to form citrate. The effect of the water to plaster ratio, gypsum powder size, water temperature, water quality, additives (retarders or accelerators), and aging time on the setting time is followed. ..., 49, 3, 2014, 293-302 PRODUCTION OF PLASTER FROM ...
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The result shows that 1% by weight of the addition leads to a compressive strength of 46.9 N/mm 2 in the plaster; for its part, the author of used self-leveling mortars based on phosphoric gypsum (alpha-Hemihydrate gypsum, α-HH), analyzing the effect on the setting time of three retarders: Protein Salt, Citric Acid and Sodium Tripolyphosphate.
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An aspect ratio (AR) close to 1 is essential to improve the quality and performance of α-HH gypsum. To solve this problem, the morphological modification of α-HH gypsum by modifiers such as glutaric acid (GA), tricarballylic acid …
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It is thought that gypsum solubilization is achieved by both oxalic acid and citric acid production (Gharieb & Gadd, 1999). Oxalic acid is a common metabolite produced by several fungi, and is implicated in the weathering of soil minerals (Graustein, Cromack & Sollins, 1977; Cromack et al., 1979).
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precipitated gypsum and yields an impure citric acid solution. Careful control of pH and temperature of the precipitation steps is important for maximizing the yield of citric acid.
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It has been claimed that citric acid yields can range from 60 to 80 g of anhydrous citric acid per 100 g of integrated sugar, or even more. Wells, Moyer, and May achieved a maximum output of 90.7% citric acid from glucose based on the amount of sugar consumed.
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The method of utilizing citric acid industrial waste residue to produce gypsum series product of the present invention, it is characterized in that this method comprises following process...
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The possibility of using gypsum-containing waste–citrogypsum, which is a by-product of the chemical biosynthesis of citric acid, was considered as an additive for composting poultry manure from ...
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Among these, A. niger ACM 4992 ensured the highest citric acid production (194 g/kg), corresponding to a yield of 0.74 g citric acid/g sugar consumed. The optimal conditions were 65% initial moisture, 3% methanol, 30 °C, unadjusted initial pH of …
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The cycle of citric acid production with the formation of gypsum-containing waste was considered and options for processing and utilization of citrogypsum were proposed.
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Citric acid (CA), an intermediate of the tricarboxylic acid cycle, is one of the most important commercially valuable products due to its widespread use mainly in food (70%), pharmaceuticals (12%), and others (18%) (Tran et al. 1998; Wang 1998; Ates et al. 2002).The global production of citric acid has increased to 1.7 million tons in 2007, as estimated by …
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The cycle of citric acid production with the formation of gypsum-containing waste was considered and options for processing and utilization of citrogypsum were proposed.
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such as polycarboxylic acids and more specifically, citric acid are used in gypsum plasters. Numerous studies have been published on the influence of citric acid as an additive in gypsum, mainly focusing on its influence on the microstructure (21-23), mechanical properties (23, 24), and, especially, its workability (23, 25, 26).
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DOI: 10.1016/J.CONBUILDMAT.2016.07.112 Corpus ID: 138915697; Effect of citric acid on properties of recycled gypsum plaster to building components @article{Camarini2016EffectOC, title={Effect of citric acid on properties of recycled gypsum plaster to building components}, author={Gladis Camarini and Maria Clara Cavalini Pinto and Aline Goulart de Moura and …
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Mycelium and gypsum are the by-products obtained. Mycelium is dried, to be used as animal feed or as fertiliser. The wet gypsum is required to be ... Sugarcane juice is in fact, a better raw material for citric acid production by fermentation, compared to beet or …
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Gypsum', which can be considered for use by the Gypsum industry. 3. Citrogypsum Citric Acid is a component found in almost all plant and animal species, and is pivotal in the ... The most important applications of Gypsum are in the production of plaster, plasterboards, Gypsum fibreboard and Gypsum blocks. The mineral forms the basis of a ...
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The effect of citric acid and 1,2-dihydroxybenzene 3,5-disulfonic acid (DHBDSA), as additives, on the crystallization of gypsum was studied under simulated conditions of the of phosphoric acid ...
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Effects of citric acid on crystalline habit and crystal morphology of gypsum dihydrate were analyzed in great detail. The retarding mechanism of citric acid was also discussed from …
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The gypsum obtained from citric acid, ... The acid purification of calcium citrate from citric acid production using sulfuric acid as a reagent resulted in citrogypsum waste. The identification of ...
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Well-known for the development and industrial application of cutting-edge citric acid processes, Vogelbusch is the world's leading supplier of citric acid plants – and not just because we …
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One of these wastes that requires the search and implementation of recycling routes is a by-product of the biochemical synthesis of citric acid – citrogypsum (CG).
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Gypsum-containing waste (GCW) derived from industries, represents a large-tonnage product. The production of gypsum materials could be one of the ways to recycle GCW products. GCW from...
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- Citric acid production is mixed growth associated, mainly take place under nitrogen and phosphate limitation after growth has ceased. - Medium requirements for high production - Carbon source: molasses or sugar solution. - Na-ferrocyanide is added to reduce Iron (1.3 ppm) and manganese (<0.1ppm). - High dissolved oxygen. concentration
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Gypsum, from either nature or industrial by-products, can be a lower-cost and cleaner alternative binder to Portland cement used in construction projects, such as affordable housing in developing countries. Although various building products have successfully used gypsum as the binder, some drawbacks of this material have still been claimed, for example, …
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