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The gypsum slurry filtration rates were generally high, but a shorter residence time (10 h) and gypsum crystals experiencing breakage and/or attrition (408 h) showed slightly lower filtration rates. Both these experiments contained a higher fraction of fines, which may explain the slightly lower filtration rates.
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 of filtration aid A is selected from the ...
Rimditch method overcomes space limitations for scrubber sludge storage. By Melissa A. Hedgecoth, Tennessee Valley Authority. TVA adds 25 years to its scrubber sludge storage capacity.
Jul 08, 2008· 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.
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 of filtration aid A is selected from the ...
Peerreview under responsibility of the Scientific Committee of SYMPHOS 2015 doi: / ScienceDirect “SYMPHOS 2015â€, 3rd International Symposium on Innovation and Technology in the Phosphate Industry Increasing the filtration rate of phosphorgypsum by using mineral additives Slimane Manar* OCP SA, Morocco ...
Gypsum, but is comparatively limited in its technical applications. The content of Gypsum in sedimentary rock varies from 75% to 95%, the rest being clay and chalk. B. Extracting Natural Gypsum Gypsum/Anhydrite are produced from opencast mines, or underground mines using pillar and stall mining methods, that give extraction rates of up to 75%.
The Florida Institute of Phosphate Research is acknowledged for sponsoring this study ... Attempts to improve the filtration rate using polymers as "filter aids" have been ... The polymer in such cases is added just prior to the filtration step to flocculate the fine gypsum particles. The improvement in filtration by filter aids is usually ...
Oct 15, 2015· A further embodiment provides a method of making a waterresistant gypsum fiber product in which a gypsum slurry is prepared with a siloxane emulsion and formed into a filter cake, allowed to set, coated with a coating comprising an alkali metal organosiliconate and siloxane is crosslinked at the surface of the gypsum fiber product during ...
A method for improving gypsum slurry filtration in the production of wet process phosphoric acid wherein an effective amount of carboxylictype polymer having a portion of sulfonic functionality is used as the filtration aid. Preferred polymers are high molecular weight polymers of acrylic acid and acrylamido methylpropyl sulfonic acid.
Pipeline Design Characteristics of Some Industrial ... DiVA portal. be achieved with the 48" steel pipe loop in conjunction ... All permanent GIW test loops are fed by centrifugal slurry pumps. .... 8V/D for fine tails and gypsum at.
Cold Filtration method is the use of ice bath in order to rapidly cool down the solution to be crystallized rather than leaving it out to cool it down slowly in the room temperature. This technique results to the formation of very small crystals as opposed to getting large crystals by cooling the solution down at .
This process involves vacuum filtration after the digestion of grinded phosphate rock and sulfuric acid in the reactor. Sefar filter solutions are the material of choice for dewatering the obtained slurry after it is blended with gypsum in order to wash and clarify the phosphoric acid by either the hemihydrate or the dihydrate production process.
Request PDF on ResearchGate | Preparation of Calcium Sulfate Whisker by Hydrothermal Method from Flue Gas Desulfurization (FGD) Gypsum | In this paper, utilizing the purified flue gas ...
An improved process for the purification of phosphogypsum. ... After attaining uniformity in the gypsum slurry, the control valve in the feed line was opened slowly and gradually. ... Proposed pilot plant for the purification of phosphogypsum Based on the results obtained by wet sieve analysis as well as hydrocyclone purification treatment of ...
The present invention provides methods and apparatus for treating flue gas containing sulfur dioxide using a scrubber, and more particularly relates to recovering gypsum and magnesium hydroxide products from the scrubber blowdown. The gypsum and magnesium hydroxide products are created using two separate precipitation reactions. Gypsum is crystallized when magnesium sulfate reacts .
Increasing the filtration rate of phosphogypsum using surfactant Article in Hydrometallurgy 119(1):5358 · January 2007 with 581 Reads How we measure ''reads''
Apr 26, 2013· The present invention discloses a process for producing a nano calcium carbonate slurry from a feedstock of waste gypsum, wherein: an aqueous gypsum slurry of the feedstock is mixed with ammonia water by stirring; with CO2 injected in the slurry is under continuous stirring until the calcium sulfate in the waste gypsum is completely carbonated into nano calcium carbonate; after filtration, .
The present invention relates to a method of purifying flue gas desulfurization (FGD) gypsum. The method is characterized by comprising the steps of a) providing an aqueous slurry containing said FGD gypsum, b) passing said aqueous slurry to a magnetic separator, and c) contacting the FGD gypsum to be purified with a solution containing an acid and having pH below 5 in an acid washing step.
Nov 12, 2009· Abstract: 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 ...
Nov 19, 2015· A method for separating a suspension containing gypsum granules and calcium carbonate granules and an aqueous solution, wherein the aqueous solution comprises at least one sodium salt, wherein the aqueous solution has a sodium ion concentration of at least 3 g/L and wherein such method comprises a step of separation by flotation using a collector for the gypsum granules, .
USA Method of improving gypsum slurry filtration . A method for improving gypsum slurry filtration in the production of wet process phosphoric acid wherein an effective amount of carboxylictype polymer having a portion of sulfonic functionality is used as the filtration aid.
The copolymer was used for the filtration aiding in the wet process phosphoric acid. The filtration rate of the gypsum slurry is increased by times, and the filter cake moisture is reduced by %, with the addition of PADB.
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