— 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 retarding effect of protein retarder on phosphorus building gypsum (PBG) and desulfurization building gypsum (DBG) was investigated, and the results show that protein retarder for DBG can effectively prolong the setting time and displays a better retarding effect, but for PBG shows a poor retarding effect. Furthermore, the …

 — After leaching, the slurry is filtered and counter-current washed to separate the acid from the phosphogypsum cake. Filtration operation represents a bottleneck in the wet-process phosphoric acid industry. Using the same filter area, the production capacity with lower operating costs can be achieved if the filtration rate is increased.

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. Preferred polymers are high molecular weight polymers of acrylic acid and acrylamido methylpropyl sulfonic acid.

Method of improving gypsum slurry filtration in the production of phosphoric acid US5571862A (en) 1994-11-28: 1996-11-05: Cytec Technology Corp. Stabilized polyacrylamide emulsions and methods of making same US6200841B1 (en) 1997-12-30: 2001-03-13: Anam Semiconductor Inc. MOS transistor that inhibits punchthrough and …

 — A polymeric filtration aid method for gypsum removal from phosphoric acid/gypsum slurry, the method comprising: injecting a CMC polymer solution into a …

The filtration rate of the gypsum slurry is increased by 4.8 times, and the filter cake moisture is reduced by 11.79%, with the addition of PADB. The mechanism of filtration aiding was also researched, which shows that PADB can change the mean diameter of crystals and agglomerate the tiny crystals; PADB can decrease the surface tension of the ...

 — 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 ...

 — It is necessary to consider the dual problems of poor performance and low production efficiency that stem from the highly utilised water/gypsum ratios in the traditional preparation of phosphorus building gypsum (PBG)-based building materials. These problems cannot be easily overcome because that PBG tends to agglomerate at low …

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 ...

 — The present paper summarizes the results of phosphoric acid production from Youssoufia Washed Floated phosphate with addition of minerals aiming at increasing …

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 …

During phosphoric acid production from phosphate rock, many wet process phosphoric acid plants use filtration aids or filter aids to improve gypsum slurry filtration and increase production rates and recovery. Filtration/filter aids are based on producing larger and more homogeneous particles or gypsum crystals to allow for faster drainage.

 — Limestone-gypsum wet flue gas desulfurization (WFGD) process is widely used in coal-fired power plants in China because of its technical characteristics of high desulfurization efficiency, mature process, and strong adjustability (Córdoba, 2017; Wang et al., 2010).With the continuous improvement of atmospheric emission standards, the …

Gypsum slurry is continuously pumped from the absorber by gypsum bleed pumps, which feed the gypsum dewatering feed tanks. The gypsum dewatering feed pumps feed slurry to the gypsum dewatering hydrocyclone clusters and vacuum belt filter trains. The gypsum dewatering hydrocyclones separate and distribute the gypsum slurry suspended solids. The

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 …

 — The acid-insoluble impurities were fine solids separated from the TBP solvent through filtration. The sulfuric acid slurry containing anhydrous gypsum in the lower layer was vacuum-filtered ...

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 …

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 …

MD integrated with in-line granular filtration successfully mitigated gypsum scaling. • In-line filtration-MD increased water recovery to 70 % from 37.5 % under off-line mode. • The Al 2 O 3 filter media after NaOH impregnation increased final MD flux by 3.6 times. • In-line granular filtration reduced gypsum scaling on MD surface by 34.5 ...

phosphoric slurry. Some minerals containing two major chemical components, silica and alumina, proved to be very effective additives for growth of phosphogypsum crystals.

Filter aid is utilized in clarification filtration processes using two methods: precoat and/or body feed addition. These two methods can be used individually or they can be combined to gain the benefits of both methods. Various filters …

After leaching, the slurry is filtered and counter-current washed to separate the acid from the phosphogypsum cake. Filtration operation represents a bottleneck in the wet-process phosphoric acid industry. Using the same filter area, the production capacity with lower operating costs can be achieved if the filtration rate is increased.

 — The cake obtained by vacuum filtration of the slurry was characterized by X-ray diffraction (XRD), Differential thermal analysis (DTA) and thermogravimetric analysis …

 — A polymeric filtration aid method for gypsum removal from phosphoric acid/gypsum slurry, the method comprising: a dual injection process where two different polymers are separately injected into a phosphoric acid/gypsum slurry at a different time, followed by filtration of gypsum solids from a liquid phosphoric acid, wherein said …

 — 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.

Tokuyama Chiyoda Gypsum Co. uses an innovative technology to filter slurry from waste gypsum boards using a screw press. This method involves continuously pressing the gypsum slurry with a screw press and then sieving the liquid component to separate paper dust and foreign matter. The screw pushes the slurry towards the outlet, ejecting the ...

Mineralogically identical to natural gypsum, FGD gypsum, or synthetic gypsum, is produced from gas captured within emission control systems at coal fired electric utilities. An emission that would compromise air quality, sulfur dioxide (SO2) gas, is the primary contribution coal makes to FGD gypsum. Utilities that produce panel-grade synthetic gypsum beneficially …

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 at …

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.