DOI: 10.36783/18069657rbcs20200135 Corpus ID: 237108939; Lime and phosphogypsum application management: changes in soil acidity, sulfur availability and crop yield @inproceedings{Besen2021LimeAP, title={Lime and phosphogypsum application management: changes in soil acidity, sulfur availability and crop yield}, …
Regression analysis showed a significant relationship between the building phosphogypsum content, fly ash content in the supplementary cementitious material, …
This study contributes to sustainable construction practices by exploring the use of phosphogypsum, a commonly discarded byproduct, in the production of recycled aggregates. Addressing both environmental and economic aspects of sustainability, we investigate the feasibility of employing phosphogypsum as a primary raw material, in …
ash–lime–phosphogypsum composite as the base course in road pavements. Al-Zaidyeen and Al-Qadi (2015); James and Pandian (2015); and de Rezende Lilian et al. (2017) found that
DOI: 10.1061/jmcee7.mteng-16617 Corpus ID: 267221092; Investigation on Engineering Characteristics of Lime-Stabilized Phosphogypsum Subgrade Filler @article{Chen2024InvestigationOE, title={Investigation on Engineering Characteristics of Lime-Stabilized Phosphogypsum Subgrade Filler}, author={Yun Chen and Xiaoping Ji …
Phosphogypsum could be used as a substitute of natural gypsum in the production of Portland cement to control the hydration reaction rate of cement. In this study, raw phosphogypsum was...
(SC) Lifosa. Dihydrate phosphogypsum was neutralized in lime suspension (water/lime ratio - 0.004) according to methodology [8, 9] to pulp pH 11.0-11.5 of phos-phogypsum with ratio of water and gypsum (W/G = 1). The neutralized phosphogypsum has been filtrated and dried at the temperature 100 ± 2°C. The pure CaO was used for the …
Fly ash-lime-phosphogypsum (FaL-G) bricks are one of the best alternatives to the conventional burnt clay bricks. This paper gives the results of an experimental investigation in which the compressive strength, water absorption, density and durability of Fly ash-lime-phosphogypsum (FaL-G) bricks were investigated by using varying quantities of fly …
Effects of applying lime and phosphogypsum in soybean and wheat nutrition Marcos Renan Besen a Programa de Pós-Graduação em Agronomia, Universidade Estadual de Maringá, Maringá, Brazil Correspondence marcos.besen@hotmail
But it has some disadvantages, especially acidity; therefore, the use of neutralized phosphogypsum (NPG) is proposed. The development of methods for the rational NPG use, both separately and in combination with mineral fertilizers, to improve soil fertility was the purpose of this study. The results of stationary field experiments to study …
According to a different study, PG can be neutralized by calcining at temperatures between 800 and 900 °C with lime washing and alkali sulphate activation …
Normally, the acidic impurities in hemihydrate phosphogypsum (HPG) must be neutralized when HPG is utilized, and a little amount of calcium hydroxide (CH) is the …
The objective of this work was to determine the impact of phosphogypsum application on 226Ra and 228Ra activities in the soil and on their accumulation in soybean grains. A field experiment was carried out in Parana state, Brazil, on a loamy Typic Hapludox, under no-till system, with increasing phosphogypsum rates: 4, 8, and 12 Mg …
The study dealt with the effect of addition of sugarcane bagasse ash (BA) on the strength development of a lime stabilized expansive soil. Unlike previous investigations with combinations of lime and BA, this study compares the effect of lime contents determined by scientifically established procedures and the effect of BA on the stabilization of lime at …
The main plot was subject to three lime treatments: (i) control (no lime); (ii) incorporated lime (IL):incorporation of 4.5 Mg lime ha À1 to a depth of 0–20 cm by; and (iii) surface lime (SL ...
To this end, mixtures of phosphogypsum and fly ash were prepared then activated with varying quicklime additions (beyond Initial Consumption of Lime) to develop different combinations of ...
0 phosphogypsum dehydrate in which there is no more than 1.3% of general P205 and 0.9% P205 which is water soluble is neutralized with lime cream and the pulp is filtered; l filtrate is once again used for lime cream preparation; l filtered phosphogypsum is dried; l dried phosphogypsum is dehydrated; l the product is cooled down; l the product ...
Phosphogypsum, neutralized with lime, with addition of 5% of clay and 5% of ground glass was burned at 900 C. This method was assuring the production of anhydrite cement of high quality with ...
Phosphogypsum, an industrial solid waste produced in wet phosphoric acid production, is difficult to be utilized due to the harmful impurities such as phosphorus and fluorine. In this study, lime neutralization process was introduced to remove soluble phosphorus and soluble fluorine from phosphogypsum in presence of polyacrylamide. …
The combination of lime + phosphogypsum did not significantly increase the root dry matter compared to that in the soil treated with lime alone except for the first common bean season at soil depths of 0.05 to 0.10 m (Fig. 1C), where the treatment increased the root dry matter by 43% compared to that in the lime-alone treatment. ...
The paper presents the suitability of flyash-limephosphogypsum composite for its use in road pavements. The content of lime and phosphogypsum was varied from 2 to 10% and 0.5 to 4% respectively in ...
As phosphogypsum is much more soluble than lime, the movement of Ca 2+ in the soil profile was facilitated by the formation of an ion pair with sulfate (CaSO4)°. The soil pH increased because the flooded conditions facilitated the displacement of SO 4 2− into the soil solution, and its movement to deeper layers.
In this study, using lignite as a reducer, the reaction characteristic of the reduction decomposition of phosphogypsum to SO2 and lime was investigated in a nitrogen atmosphere at different conditions. Scanning electron microscopy and XRD-ray diffraction were used to analyze the solid production. The gas production of SO2 was …
In this work, the combined effect of Lime and Phosphogypsum (PG) on compaction characteristics, Atterberg's Limit, Unconfined Compressive Strength (UCS) for original soil, California Bearing Ratio (CBR) and direct shear Test of a black cotton soil with percentage varying of Lime and Phosphogypsum was carried out. The soil samples were tested ...
phosphogypsum-based super sulfated cement Nguyen Ngoc Lam-Effect of curing temperature and particle size distribution on unconfined compressive strength of raw and treated fly ash-lime modified phosphogypsum waste T Mashifana, F Okonta and F Ntuli ... the acids contained in it are neutralized. 1. Introduction Phosphogypsum is …
Nearly 300 million t of phosphogypsum (PG) are produced every year as a byproduct from phosphate fertilizer production worldwide. Approximately 58% of the PG are stacked, 28% are discharged in coastal waters and only 14% are further processed. This critical review provides an overview of the physical-chemical properties of PG produced …
DOI: 10.1016/J.CATENA.2015.09.009 Corpus ID: 130975521; Soil fertility, plant nutrition, and grain yield of upland rice affected by surface application of lime, silicate, and phosphogypsum in a tropical no-till system
Neutralized phosphogypsum has been used to improve the soil fertility and quality of plant products (Efremova et al., 2020). The strength and permeability of stabilized peat soil are influenced by ...
In this study, phosphogypsum was stabilized by lime to improve the mechanical properties [California bearing ratio (CBR), resilience modulus, unconfined compressive strength, and shear strength], water stability, and harmful substances dissolubility. Combined with scanning electron microscopy, the strength formation and …
Phosphogypsum (PG) is a calcium sulphate dihydrate and a by-product of the phosphate fertilizer industry. It is produced in huge quantities (300 MT/year), but only 15% of the PG produced is recycled. Phosphogypsum is valued in several sectors: road construction,...
The condition of neutralizing calcination involves phosphogypsum that has been neutralized by lime being calcined at 800 °C for 2 h. Li et al. [ 115 ] reported the extraction of phosphogypsum using 30% sulfuric acid hydrolysis coupled with tributyl phosphate, and the fluorine content in gypsum can be reduced to be lower than the …
In this study, we investigated a coarse phosphogypsum containing 49.63% SO3, 41.41% CaO, 10.68%, 4.47% SiO2, 1.28% P2O5, 0.11% F, CaSO4·2H2O purity of 80.65%, and whiteness of 27.68. Phosphogypsum contains calcium sulfate dehydrate as the main mineral, with small amounts of brushite, quartz, muscovite, and zoisite. Harmful …
hour, 0.5 kg of phosphogypsum had been strewn into the lime suspension mixed in the reaction vessel. After 10 minutes of additional mixing, for 5 minutes the neutralized phosphogypsum pulp had been filtrated with the vacuum cleaner through the filtrating paper (white tape). For the preparation of the first lime
tal production neutralized phosphogypsum was dried in the drum-type 5 t/h efficiency dryer SB-1.6-81 and boiled in 4.5 m3 capacity gypsum boiler or in 63 l capa-city autoclave. RESULTS AND DISCUSSION Impurities of phosphogypsum Most impurities in phosphogypsum consists from a phosphate impurities remaining when …
DOI: 10.1016/J.AGEE.2017.02.027 Corpus ID: 90239872; Lime and phosphogypsum impacts on soil organic matter pools in a tropical Oxisol under long-term no-till conditions @article{Filho2017LimeAP, title={Lime and phosphogypsum impacts on soil organic matter pools in a tropical Oxisol under long-term no-till conditions}, author={Antonio C.A. …
raw phosphogypsum was 4.7-4.8, meanwhile pH of the phosphogypsum neutralized by lime (according to the method [9, 10]) was 11.0-11.5. The specific surface area was 392 m2/ kg. X-ray diffraction ...
Double-sided tuning effects of lactic acid on the hydration, microstructure and strength of supersulfated cement. In this study, hemihydrate gypsum was employed to …
Addition of sisal fibres to the bentonite-lime-phosphogypsum mix changes the behaviour of the composite from brittle to ductile in the post peak region. ... from Oman, Building and Environment, 40 ...
The condition of neutralizing calcination involves phosphogypsum that has been neutralized by lime being calcined at 800 °C for 2 h. Li et al. reported the …
