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Thickening and Filtration Steps in Phosphoric Acid Processing, there are thickening, filtration and clarification steps throughout the process. This paper will present design recommendations for ...
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ries", and the method and results of the elonga-tional measurements and their comparison with the shear data are given in the sub-section "Elon-gational Rheology of Gypsum Slurries". After that, conclusions are drawn. 2 MATERIALS AND METHODS Stucco-b-hemihydrate form of synthetic gypsum (Figure 1) - and all the additives were supplied by
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The effect of surface-active agents (surfactants), as additives, on the crystallization of gypsum was studied under conditions of the simulated dihydrate process of phosphoric acid production.
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Washing the flue gas with a limestone slurry became established as the most successful method. Efficient dewatering of the gypsum slurry provides an end product with good reusability. High purity levels and ... Operation Batch-type filtration Basket diameter 1,000, 1,250, 1,600 mm Basket volume 220-1300 l
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Wet scrubber processes are most commonly used for flue gas desulphurisation (FGD). As well as SO2 and SO3, HCl and HF, fine particulate matter and some air-borne toxins can be removed simultaneously . Wet FGD technologies can be grouped into those that use calcium-based sorbents, magnesium-, potassium- or …
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DOI: 10.1016/J.HYDROMET.2006.08.004 Corpus ID: 96939850; Increasing the filtration rate of phospho-gypsum using surfactant @article{AbdelAal2007IncreasingTF, title={Increasing the filtration rate of phospho-gypsum using surfactant}, author={El-Sayed A. Abdel-Aal and Mohamed H. H. Mahmoud and Hassan E. El-Shall and A. K. Ismail}, …
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What is claimed is: 1. A polymeric filtration aid method for gypsum removal from phosphoric acid/gypsum slurry, the method comprising: injecting a CMC polymer solution into a phosphoric acid/gypsum slurry, wherein said CMC polymer is carboxymethylcellulose comprising a polymerized cellulose ether. 2. The method …
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What is claimed is: 1. A method for improving the filtration of a gypsum slurry in a wet process phosphoric acid manufacturing process which comprises adding to a said gypsum slurry an effective amount of a polymer which consists essentially of about 0.5 to about 99.5%, by weight, of: a) an unsaturated carboxylic acid selected from the group …
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A chemical process to improve the filtration performance for the removal of gypsum from phosphoric acid/gypsum slurry using a filtration aid that is selected from a class of polymers, lower molecular weight anionic polyelectrolytes, which previously have not been used for this application. The polymer is CMC or Carboxymethyl Cellulose, which is a …
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Washing the flue gas with a limestone slurry became established as the most successful method. Efficient dewatering of the gypsum slurry provides an end product with good reusability. High purity levels and lowest residual moisture are best obtained using …
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A process to improve the polymeric filtration aid performance used in removal of gypsum from phosphoric acid/gypsum slurry. A synergistic effect has been observed by using a Dual Injection method. This method more specifically involves using two polymers (A & B) of different chemistry and injecting into slurry at a different time.
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Method of improving gypsum slurry filtration in the production of phosphoric acid: : Rey et al. 5185135: Method of dewatering a wet process phosphoric acid slurry: : Pillai et al. 5173280: Method of clarifying phosphoric acid using high charge sulfonic-type polymers: : Rey et al. 5009873
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A method for improving gypsum slurry filtration in the production of wet process phosphoric acid wherein an effective amount of carboxylic-type polymer having a portion of sulfonic functionality is used as the filtration aid.
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US8182698B2 US12/828,061 US82806110A US8182698B2 US 8182698 B2 US8182698 B2 US 8182698B2 US 82806110 A US82806110 A US 82806110A US 8182698 B2 US8182698 B2 US 8182698B2 Authority US United States Prior art keywords phosphoric acid polymer cmc filtration slurry Prior art date Legal status (The legal …
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A chemical process to improve the filtration performance for the removal of gypsum from phosphoric acid/gypsum slurry using a filtration aid that is selected from a class of polymers, lower molecular weight anionic polyelectrolytes, which previously have not been used for this application.
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P63P with adjustable speeds, feeds UCEGO # 10 and 24-60 PRAYON filters to separate gypsum from acid. The gypsum cake is washed two times by warm water 60°C in order to retrieve the P
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A process to improve the polymeric filtration aid performance used in removal of gypsum from phosphoric acid/gypsum slurry. A synergistic effect has been observed by using a Dual Injection method. This method more specifically involves using two polymers (A & B) of different chemistry and injecting into slurry at a different time. The polymer chemistry …
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The electrocoagulation method for electrochemically introducing coagulants is also still waiting to be used in the dewatering of coal slurry. The use of this method to remove color, COD, and turbidity from municipal solid waste leachate has been shown satisfactory results .
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Washing the flue gas with a limestone slurry became established as the most successful method. Efficient dewatering of the gypsum slurry provides an end product with good reusability. High purity levels and ... Operation Batch-type filtration Basket diameter 1,000, 1,250, 1,600 mm Basket volume 220-1300 l
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The purpose of a vacuum filter is "Slurry Filtering" and therefore to remove more of the water from the concentrate, this "Concentrate Filtration" is accomplished by using a vacuum. Again for your understanding of the method you will have to know something about the design of a filtering system and of course the filter itself. ...
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Phosphoric slurry overflows the R6301 tank to passing vessel R6302, from which it is transferred to the digester tank R6303, where maturation of the gypsum crystals is completed. From this last tank, two slurry pumps P63U and P63P with adjustable speeds, feeds UCEGO # 10 and 24-60 PRAYON filters to separate gypsum from acid.
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The filtration of phosphogypsum is a ubiquitous step in the manufacturing of phosphoric acid. It is highly desired to achieve the minimum concentration of P2O5 in the phosphogypsum cake. This work is aimed at addressing P2O5 losses in phosphogypsum (PG) along with the recovery of P2O5 from slurry by using constant pressure filtration …
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A wet-type reagent feeder was used to add flocculant to the discharge of the funnel at the entrance to a 10-foot length of pipe that carried the slurry to the filter by gravity. This arrangement for flocculating and feeding the slurry to the filter was the result of experimenting with a number of methods.
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Question: Determine the filtration rate for a gypsum slurry that can be expected from a basket centrifugal filter using the data below. Assume that the cake is incompressible, filter medium resistance is negligible.
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A process to improve the polymeric filtration aid performance used in removal of gypsum from phosphoric acid/gypsum slurry. A synergistic effect has been observed by using a Dual Injection method. This method more specifically involves using two polymers (A & B) of different chemistry and injecting into slurry at a different time.
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The experiment results show that after using the new method, the slurry with a water content of 400 % can rapidly drop to 62 % within 150 s, and 7-day unconfined compressive strength of the dewatered soil ... measures to optimize and improve the vacuum filtration method could be proposed. Reducing the water content of the …
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and the gypsum slurry was stirred to form gypsum slurry. ... Research on the method of improving the influence of chloride ion on the performance of desulfurized gypsum products [J]. New building ...
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A process to improve the polymeric filtration aid performance used in removal of gypsum from phosphoric acid/gypsum slurry. A synergistic effect has been observed by using a Dual Injection method. This method more specifically involves using two polymers (A & B) of different chemistry and injecting into slurry at a different time. The polymer chemistry …
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Method of improving gypsum slurry filtration in the production of phosphoric acid US5571862A (en) : : Cytec Technology Corp. Stabilized polyacrylamide emulsions and methods of making same US6200841B1 (en) : : Anam Semiconductor Inc. MOS transistor that inhibits punchthrough and …
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Natural gypsum can be used in concrete production as a replacement for calcium aluminate cement (CAC), opening the possibility of replacing the natural gypsum with FGDG in this application with success, even though some studies have reported a reduction of compressive strength and water solubility when compared to conventional …
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