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Efeito Dos Diferentes Tipos De Fosforite Nos Superfosfatos Simples
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O objetivo principal deste trabalho é estudar a influência dos diferentes tipos de fosforite (argelina e marroquina) na produção dos superfosfatos simples, SSP. Em termos de custo da matéria-prima, a fosforite argelina é a mais acessível no mercado. No entanto, nas condições atuais de funcionamento da unidade fabril da SOPAC, apenas a fosforite marroquina permite obter os SSPs de maneira eficiente. Isto é, com um teor de fósforo total em volta dos 18%(m/m), o que implica uma conversão do fósforo em volta dos 99%. Por outro lado, estudos na literatura indicam que a qualidade dos SSPs assim como a conversão do seu processo de produção é amplamente afetada pela granulometria da fosforite usada, que por sua vez depende da composição da fosforite sobretudo o teor de impurezas.
O primeiro estudo consistiu na determinação da composição química da fosforite marroquina e argelina por espectrofotometria de fluxo segmentado e ICP (Inductionly Coupled Plasma), verificando-se então que tanto a fosforite marroquina como a fosforite argelina possuem o mesmo teor de P2O5 total cerca de 31.75% variando apenas o teor de impurezas, a fosforite argelina possuí um teor de impurezas em catiões metálicos mais elevados que a marroquina.
No segundo estudo demonstrou-se que o grau de moenda da fosforite marroquina é melhor que o da argelina, devido aos altos níveis de impurezas na fosforite argelina, nomeadamente, um teor de potássio 60% superior, um teor de ferro 23% superior e de magnésio superior de 40% relativamente a fosforite marroquina. Em sequência, foi igualmente investigado o impacto das moagens 1,2,4,5 (M1-M5) no grau de moenda. Para as duas fosforites observou-se que apenas a moagem M4 permite obter uma granulometria acima dos 70% (m/m) de retidos no peneiro abaixo de 0.075mm (meta estabelecida).
No terceiro estudo, foi demonstrado, que usando a fosforite argelina é igualmente possível produzir SSP com bons níveis de conversão entre 86-88%, usando especialmente a moagem M4, com ácido sulfúrico concentrado a 72%. Para tal seria necessário um tempo de residência maior e por conseguinte um investimento suplementar num reator de maior volume.
The main objective of this work is to study the influence of different types of phosphorite (Algerian and Moroccan) on the production of single superphosphates (SSPs). In terms of cost, the Algerian phosphorite is the most affordable. However, with the SOPAC’s current operating conditions, only the Moroccan phosphorite produces SSPs efficiently, with a total phosphorus content of 18% (m/m), which implies a phosphorus conversion of 99%. On the other hand, studies in the literature indicate that the quality of SSPs as well as its production conversion is largely affected by the phosphorite particle size, which in turn depends on the phosphorite composition especially the impurity content. The first study focused in determining the chemical composition for both phosphorites with the help of segmented flow spectrophotometry and ICP (Inductionly Coupled Plasma) methods. Where it was verified that both the Moroccan phosphorite and Algerian phosphorite have the same total P2O5 content, around 31.75%, varying the impurity content only. The Algerian phosphorite was found to have a higher content of impurities in metal cations. The second study showed that the grinding degree of Moroccan phosphorite is better than that of the Algerian one, due to the high level of impurities in Algerian phosphorite, namely 60% higher potassium content, 23% higher iron content and over 40% higher magnesium content. The impact of the mills 1,2,4,5 (M1-M2-M4-M5) on the degree of grinding was also investigated. For both phosphorites, it was observed that only the M4 mill gives a particle size above 70% (m/m) retained on the sieve below 0.075mm (target). In the third study, it was shown that using the Algerian phosphorite it is also possible to produce SSP with good conversion levels (86-88%), especially using the M4 grinding mil with 72% concentrated sulfuric acid. This would require a longer residence time and therefore an additional investment on a larger reactor.
The main objective of this work is to study the influence of different types of phosphorite (Algerian and Moroccan) on the production of single superphosphates (SSPs). In terms of cost, the Algerian phosphorite is the most affordable. However, with the SOPAC’s current operating conditions, only the Moroccan phosphorite produces SSPs efficiently, with a total phosphorus content of 18% (m/m), which implies a phosphorus conversion of 99%. On the other hand, studies in the literature indicate that the quality of SSPs as well as its production conversion is largely affected by the phosphorite particle size, which in turn depends on the phosphorite composition especially the impurity content. The first study focused in determining the chemical composition for both phosphorites with the help of segmented flow spectrophotometry and ICP (Inductionly Coupled Plasma) methods. Where it was verified that both the Moroccan phosphorite and Algerian phosphorite have the same total P2O5 content, around 31.75%, varying the impurity content only. The Algerian phosphorite was found to have a higher content of impurities in metal cations. The second study showed that the grinding degree of Moroccan phosphorite is better than that of the Algerian one, due to the high level of impurities in Algerian phosphorite, namely 60% higher potassium content, 23% higher iron content and over 40% higher magnesium content. The impact of the mills 1,2,4,5 (M1-M2-M4-M5) on the degree of grinding was also investigated. For both phosphorites, it was observed that only the M4 mill gives a particle size above 70% (m/m) retained on the sieve below 0.075mm (target). In the third study, it was shown that using the Algerian phosphorite it is also possible to produce SSP with good conversion levels (86-88%), especially using the M4 grinding mil with 72% concentrated sulfuric acid. This would require a longer residence time and therefore an additional investment on a larger reactor.
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Fosforites Superfosfatos simples (SSP) Impurezas Conversão Fertilizantes Granulometria