Method for improving gypsum/phosphoric acid slurry filtration …
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.
Filtration / Filter Aids for Phosphoric Acid Production
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.
WO2007055771A3
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 …
How to Improve & Aid Slurry Filtration by Flocculation
— 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.
Deterioration Reason and Improvement Measure of the
— 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 …
US20120171099A1
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 …
Paper 605 for POWID: Gypsum Dewatering at FGD …
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
Dewatering characteristics of waste slurry from pipe jacking …
— 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 (q 7day) can reach 117.33 kPa. The key mechanism of the improved vacuum filtration method was discussed.
A novel method for preparing phosphorus building gypsum …
— 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 …
Dual injection of two polymeric filtration aids for gypsum …
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.
Improving Gypsum Slurry Filtration in the Production of …
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 ...
Slurry Filtering & Concentrate Filtration
— 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.
Relationship, Selection, and Optimization of Filter Aid, …
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 …
Improving Gypsum Slurry Filtration in the Production 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.
Preparation of gypsum with high purity and whiteness from …
— 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 ...
DUAL INJECTION OF TWO POLYMERIC FILTRATION AIDS FOR GYPSUM …
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.
SEPARATION GYPSUM DEWATERING AT THE HIGHEST …
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 …
Increasing the Filtration Rate of Phosphor-gypsum by …
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.
Effect of Flocculation on Gypsum Filtration Efficiency
— 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...
Dual Injection of Two Polymeric Filtration Aids for Gypsum …
— 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 …
Method of improving gypsum slurry filtration in the …
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 …
METHOD FOR IMPROVING GYPSUM/PHOSPHORIC ACID …
— A polymeric filtration aid method for gypsum removal from phosphoric acid/gypsum slurry, the method comprising: injecting a CMC polymer solution into a …
Gypsum Recycling: An Environmental and Industrial Solution
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 ...
Increasing the filtration rate of phospho-gypsum using …
— The cake obtained by vacuum filtration of the slurry was characterized by X-ray diffraction (XRD), Differential thermal analysis (DTA) and thermogravimetric analysis …
WO2007055771A2
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 …
US20070102368A1
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 …
US7396474B2
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 …
Dual injection of two polymeric filtration aids for gypsum …
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 …
SEPARATION GYPSUM DEWATERING AT THE …
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
METHOD FOR IMPROVING GYPSUM/PHOSPHORIC ACID …
The present invention is a chemical process to improve the filtration performance for the removal of gypsum from phosphoric acid/gypsum slurry via a novel filtration aid. The …
US20080210638A1
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 …