— Improvement in filtration efficiency of gypsum upon flocculation is determined to be due to reduction in the blockage of filter media pores and in the filter cake resistance. An optimum in polymer dosage is explained in terms of stabilization of fines and...
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 status …
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
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 polymeric filtration aid method for gypsum removal from phosphoric acid/gypsum slurry, the method comprising: injecting a CMC polymer solution into a …
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 …
7. concentrate and the surplus ammonia recovery method of waste heat according to the described a kind of chemical gypsum system sulphur ammonium reaction slurry of claim 6, it is characterized in that described step (5) filtration, drying and evaporative crystallization are specially: will discharge from the vacuum flasher bottom through ...
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 present paper summarizes the results of phosphoric acid production from Youssoufia Washed Floated phosphate with addition of minerals aiming at increasing …
— The cake obtained by vacuum filtration of the slurry was characterized by X-ray diffraction (XRD), Differential thermal analysis (DTA) and thermogravimetric analysis …
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 …
— 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 …
— 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 …
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 …
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 ...
— 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 ...
— The cake obtained by vacuum filtration of the slurry was characterized by X-ray diffraction (XRD), Differential thermal analysis (DTA) and thermogravimetric analysis (TGA). The main peaks obtained by XRD were attributed to chukrovite (Ca 4 AlSiSO 4 F 13 ·12H 2 O), gypsum, and silica quartz.
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 …
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 …
— 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 ...
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
— The sulfuric acid slurry containing anhydrous gypsum in the lower layer was vacuum-filtered, washed with deionized water, and dried in an oven at 60 °C for 4 h to …
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 …
— 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.
— 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 …
— 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 …
