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·The effect of phosphogypsum PG on the hydration and retardation mechanism of phosphogypsum based excess sulfate slag cement PESC was mainly investigated Based on the natural characteristics of PG such as low pH value and the presence of soluble phosphorus impurities the content of PG passing the mm standard sieve was used as a variable to
·The present study aimed to increase the utilization of phosphogypsum and reduce cement consumption Single factor experiments were designed to the effects of water cement ratio silica fume 1 %∼7 % cement dosage 0 %∼20 % and the RPG/HPG 20/80 0/100 on mechanical properties of phosphogypsum based concretes PGBCs
·valorized as a set retarder in Portland cement replacing the gypsum rocks In this study influence of phosphogypsum contents on concrete and Portland cement properties was investigated Phosphogypsum was mixed with Portland cement at different mass contents extended from 1 to 20% wt/wt Setting time
·The Industrial Waste phosphogypsum is a waste product which was produced from the chemical industries This waste material is used in concrete
Thus this paper aims to analyze the soluble phosphate fluoride and pH effects of Brazilian phosphogypsum used as a setting retarder on the hydration of Portland cement Different sources of calcium sulfate were analyzed natural gypsum NG alkaline phosphogypsum PGA and acid phosphogypsum PGB
·Abstract The resource utilization of phosphogypsum PG can reduce the consumption of resources turn waste into valuables turn damage into profit and form a green recycling economy of resources products regenerated resources The article combined with the comprehensive utilization of PG analyzes the existing problems Using lime neutralization to
·The aluminum recovery rate of the process is up to % This process reduces the cost it affords a high aluminum recovery rate and the cement has a good anti freezing effect GenKuan Ren presented a method for preparing cement with red mud modified by phosphogypsum as a cement material In this experiment red mud and phosphogypsum were
·Once the phosphogypsum was introduced into the cement mill samples of this material clinker milled with it and the Plant investigation into use of treated phosphogypsum as set retarder in OPC and OPC/fly ash blend 793 resulting cement produced were collected every hour for a period of at least 8 hours
·Phosphogypsum PG is a by product produced during the wet process of phosphoric acid H3PO4 production from natural phosphate rocks Approximately 4 6 tons of PG is produced per ton of phosphoric acid production where worldwide PG generation exceeds 300 million tons annually The vast majority of produced PG is discarded irresponsibly leading to
·The utilization of the phosphogypsum PG as cement retarder is both an economical and an ecological approach to treat this solid waste Cement using raw PG as retarder has two problems pressing for solution namely delaying the setting time and difficulty being fed into the cement mill
·The present paper deals with the experimental investigation on compressive tensile and flexural strength characteristics of partially cement replaced phosphogypsum concrete using 0% 10% 20%
·Phosphogypsum PG the by product of phosphoric acid industry comprises of calcium sulfate dihydrate and other contaminants which restricts the industrial use of phosphogypsum in cement industry as a set retarder Remedial thermal treatment of phosphogypsum as a set retarder for Portland cement production is investigated in this
·Therefore a treatment consisting of combined milling with a slurry of slaked lime is recommended to render phosphogypsum suitable as a substitute for natural gypsum as a set retarder in cement Follow up work in this regard has been reported in a subsequent communication [12]
·Gypsum is a key component in cement because it plays vital role in controlling the setting behavior of the cement PG is a chemical gypsum contains substantial amount of SO 3 and has the potential to replace mineral gypsum in cement PG acts as super retarder by extending cement setting process The retardation property of PG calcinated at 250 550 °C
·Supersulfated cement SSC is a kind of environment friendly cement as well as a newly developed non burnt cementitious material with less clinker or even without clinker [1] [2] The common compositions of SSC are always about 75 85% ground granulated blast furnace slag slag 10 20% gypsum as sulfate activator and less than 5% clinker or lime as alkali
The utilization of the phosphogypsum PG as cement retarder is both an economical and an ecological approach to treat this solid waste Cement using raw PG as retarder has two problems pressing for Expand 95 Save Utilization of solidified phosphogypsum as
·It is found that the combination of a thermal and a sulphuric acid treatment was successful in removing most of the harmful phosphorus impurities from South African phosphogypsum and could successfully replace natural gypsum in Portland cement Phosphogypsum is a by product of the manufacture of wet phosphoric acid and most of it
Phosphogypsum was chemically pretreated by using lime solution ammonium hydroxide and aqueous citric acid solution content of impurities of purified phosphogypsum was examined and its DTA was setting time and strength of the cement produced with purified phosphogypsum were showed that the phosphogypsum pretreated by
·Phosphogypsum had high calcium content so it could be used in the production of cement raw materials in addition to being used as a cement retarder Rosales et al 2020 The mortar and concrete produced by cement that contained PG had high compressive strength which meaned that using PG as a raw material for cement was technically possible
·The inevitably incorporation of P 2 O 5 impurity results in the poor quality of phosphogypsum PG which further hinders the utilisation of PG in manufacturing the supersulfated cement SSC an environment friendly and energy saving cement made almost entirely from industrial waste Lime neutralisation provides a sustainable approach to remove
·Cemented backfill technology also is recognized for its potential in addressing chemical solid wastes management exemplified by the utilization of phosphogypsum PG [12] [13] PG primarily composed of gypsum CaSO 4 ·2H 2 O is a supersulfate byproduct derived from the process of extracting phosphorus from phosphate ore [14] Previous work by Li et al
·The Bayer red mud RM and phosphogypsum PG accumulation have caused significant environmental contamination However practical and effective resource utilization technologies are still lacking currently This work aims to develop ferric sulfoaluminate cement FSAC employing low cost materials including Bayer red mud phosphogypsum and other
·In this study usability of weathered phosphogypsum PG from residue areas as set retarder in Portland cement was investigated The effects on the setting and mechanical properties of PG added in
·Thus this paper aims to analyze the soluble phosphate fluoride and pH effects of Brazilian phosphogypsum used as a setting retarder on the hydration of Portland cement
·every year so the utilization of PG as cement retarder is an efficient way to manage the cement only contains about 5 % of PG and thus the harmful ingredients in PG
