Phosphogypsum
Mostrando 1-12 de 16 artigos, teses e dissertações.
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1. Rheological properties and hydration of ternary cements containing clay brick, clay tile, marble, and phosphogypsum waste
Resumo Não há pesquisas que demonstrem o efeito de matérias-primas residuais combinadas como alternativa às fontes naturais em cimentos do tipo LC 3 . Nesse contexo, o objetivo deste estudo é avaliar a influência da composição de cimentos ternários contendo resíduos industriais sobre as suas propriedades reológicas e de hidratação. Como matéri
Ambiente Construído. Publicado em: 2022
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2. Gypsum application, soil fertility and cotton root growth
ABSTRACT Since there is no consensus on phosphogypsum (PG) rates to be used in agriculture, a better understanding of its effects on the soil solution is needed. Cotton root growth was evaluated as related to Al and Ca activity in soil solution affected by PG. The experiment was carried out in rhizotrons filled with30∙dm–3 of soil. PG rates were estimate
Bragantia. Publicado em: 11/04/2019
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3. Do Rates and Splitting of Phosphogypsum Applications Influence the Soil and Annual Crops in a No-Tillage System?
ABSTRACT Applications of phosphogypsum (PG) provide nutrients to the soil and reduce Al3+ activity, favoring soil fertility and root growth, but allow Mg2+ mobilization through the soil profile, resulting in variations in the PG rate required to achieve the optimum crop yield. This study evaluated the effect of application rates and splitting of PG on soil f
Rev. Bras. Ciênc. Solo. Publicado em: 2016
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4. GESSO AGRÍCOLA E ADUBAÇÃO NITROGENADA NA CULTURA DO MILHO EM SISTEMA PLANTIO DIRETO
A considerably part of the high nitrogen (N) rates applied in corn is not absorbed due root growth restriction by subsoil acidity. Gypsum is able to improve conditions for root growth and lead to greater N uptake efficiency, increasing corn yield. Thus to evaluate the effect of gypsum and N on top dressing on soil chemical attributes, root growth , mineral n
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 10/11/2012
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5. Forms of sulfur in Brazilian Oxisols under no-tillage system / Formas de enxofre em Latossolos sob sistema plantio direto
Soil is a critical component of the global sulfur (S) cycle acting as source and a sink for various S species and mediating changes of S oxidation states. However, very little is known about the identities of these specific organic and inorganic S containing molecules, especially in Brazilian soils under no-tillage (NT) system. Thus, the objectives of this s
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 16/02/2012
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6. Estudo da exalação de radônio em placas e tijolos de fosfogesso de diferentes procedências / Study of radon exhalation from phosphogypsum plates and blocks from different origins
O fosfogesso é um resíduo da indústria de fertilizantes fosfatados que concentra radionuclídeos naturais. Neste trabalho foi estudada a taxa de exalação de 222Rn em placas e tijolos de fosfogesso, visando sua utilização na construção de residências. Para tanto, foram determinadas a taxa de exalação de 222Rn por meio da técnica da câmara de acu
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 13/12/2011
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7. Disponibilidade de metais em amostras de fosfogesso e fertilizantes fosfatados utilizados na agricultura / Availability of metals in samples of phosphogypsum and phosphate fertilizers used in agriculture
Os fertilizantes fosfatados produzidos no Brasil são obtidos principalmente pelo processamento por via úmida da rocha fosfática ígnea com ácido sulfúrico concentrado, gerando como produto final o ácido fosfórico e como subproduto o sulfato de cálcio di-hidratado (fosfogesso ou gesso agrícola). Parte do fosfogesso gerado é estocada em pilhas a céu
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 18/08/2010
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8. ESTUDO LABORATORIAL DE MISTURAS DE FOSFOGESSO, SOLO TROPICAL E CAL PARA FINS DE PAVIMENTAÇÃO / Laboratory study of mixtures of gypsum, lime and tropical soil for paviment
The phosphogypsum, subproduct of the manufacture of the phosphoric acid, became the objective of studies, due that it requires the availability of large areas to be stored. The disposal this waste increases the cost of generating company and can even cause a series of environmental problems. In this context, It has been arisen the interest to study the appli
Publicado em: 2009
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9. Laboratory study of mixtures of gypsum, lime and tropical soil for paviment / ESTUDO LABORATORIAL DE MISTURAS DE FOSFOGESSO, SOLO TROPICAL E CAL PARA FINS DE PAVIMENTAÇÃO
The phosphogypsum, subproduct of the manufacture of the phosphoric acid, became the objective of studies, due that it requires the availability of large areas to be stored. The disposal this waste increases the cost of generating company and can even cause a series of environmental problems. In this context, It has been arisen the interest to study the appli
Publicado em: 2009
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10. Cama de casca de café tratada com condicionadores químicos e sua influência na qualidade do coxim plantar de frangos de corte / Coffee hull litter treated with chemical conditioners and its influence on quality of foot pads broilers
Along with the opening of new markets for feet of broiler exportation there has been a bigger concerning to the identification of injuries that lead to the cutting. Because of this, the present study had as its aim evaluate the influence of coffee hull litter treated with chemical conditioners on foot pads broilers, on the animal performance of the broilers
Publicado em: 2009
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11. Thermo-acoustic comfort of a low-cost housing / Conforto termo-acústico de uma habitação de baixo custo
The use of new technologies associated with new materials is a contribution to the building industry, decreasing the housing deficit and reducing the environmental impacts generated by traditional design techniques. These new materials are alternatives to the current shortage of materials for construction, which has raised the prices of construction in our c
Publicado em: 2009
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12. EXTERNAL EXPOSURE ASSESSMENT IN DWELLING BUILT WITH PHOSPHOGYPSUM / Avaliação da exposição externa em residência construída com fosfogesso
In this study it was evaluated the viability of the use of phosphogypsum plates as a building material in the dwelling construction. Thus, the effective dose due to external gamma exposure was assessed through the 226Ra, 232Th, 210Pb e 40K activity concentration in phosphogypsum plates. Samples of this material were analyzed by high resolution gamma spectrom
Publicado em: 2008