1、(PDF) Environmental implications of phosphate

The objectives of this review are to provide guidelines for eliminating the bottleneck pollutions that occur from the phosphate-based fertilizer industries and explore the management...

2、Potentially toxic elements in different inorganic and organic

The compiled data was first divided into inorganic and organic origins and then into the 14 fertilizer types; 6 inorganic and 8 organic group of fertilizers. The result showed that the average PTEs concentration is widely varied between and within the group of fertilizers.

3、Risks and governance of heavy metals in European soil applied phosphate

In this paper, the undesired inorganic elements in P fertilizers were analyzed in phosphate rock and fertilizer samples, and the possibility to trace the origin of phosphate rocks and P fertilizers by employing tracer techniques were evaluated.

4、Environmental impact assessment of phosphate fertilizers and

Two samples of each the phosphate fertilizers (PF-I & PF-III) and phosphogypsum waste (PG) materials produced in Abu Zaabal factory for fertilizers and chemical materials, Egypt, were collected to cover all the consumed phosphate fertilizers in the agriculture aspects.

5、Fluoride contents in commonly used commercial phosphate fertilizers and

In this study, we investigated the fluoride content characteristics of the six most common types of phosphate fertilizers (MKP, SSP, MAP, DAP, NPK, and WSF) used in China’s agricultural production, analyzed the potential risks of different types of phosphate fertilizer application on fluoride accumulation in the soils of five common crops ...

Environmental implications of phosphate

During the green revolution in the mid-twentieth century, the consumption of inorganic phosphorous and phosphate-based fertilizers (P-fertilizers) in the developing world skyrocketed, resulting in a proliferation of P-fertilizer industries.

Understanding phosphorus fertilizers

The wet process involves treating the rock phosphate with acid-producing phosphoric acid – also called green or black acid – and gypsum, which is removed as a by-product. The impurities that give the acid its color haven’t been a problem in the production of dry fertilizers.

Effect of the Impurities on the Phosphoric Acid Process

The objective of this work is to analyze the influence of some of these main impurities (iron, aluminum and magnesium) in the production process of phosphoric acid. A referential methodology (induced crystallization) of phosphoric acid production was developed.

Agronomic and environmental aspects of phosphate fertilizers

This review discusses and summarizes the latest reports regarding the agronomic utilization and potential environmental effects of different types of phosphate (P) fertilizers that vary in solubility.

Microsoft Word

Production of phosphoric acid and phosphatic fertiliser is influenced by soluble impurities contained in the phosphate rock. They will influence the process, the quality of the acid and the gypsum produced as well as the downstream units using this phosphoric acid.

Types of Impurities in Imported Phosphate Fertilizers:

1. Moisture: The water content in phosphate fertilizers directly affects its effectiveness and storage life. Excessive moisture can cause caking, mold growth, and reduced fertilizer efficiency; insufficient moisture may impact dissolution speed and nutrient absorption. strict moisture testing of imported phosphate fertilizers is essential.

2. Organic Matter: Phosphate fertilizers often contain organic compounds such as cellulose and lignin. These materials decompose rapidly under high temperatures, releasing significant heat, which threatens the stability and safety of the fertilizer. Additionally, organic matter may slow dissolution rates and reduce nutrient absorption efficiency. Thus, organic matter testing for imported phosphate fertilizers is critical.

3. Heavy Metals: Phosphate fertilizers may contain trace heavy metals like lead (Pb), mercury (Hg), and cadmium (Cd). Accumulation of these metals in soil severely harms plant growth and may cause mortality. Consequently, heavy metal testing for imported phosphate fertilizers is indispensable.

4. Microorganisms: Phosphate fertilizers might harbor microorganisms like bacteria and fungi. Under favorable conditions, these organisms proliferate rapidly, consuming nutrients and reducing fertilizer efficacy. they may produce harmful substances posing health risks. microbial testing for imported phosphate fertilizers is vital.

5. Salinity: Phosphate fertilizers may include salts such as sodium sulfate and sodium chloride. These salts react with soil cations, altering soil pH and nutritional balance. Furthermore, salinity can inhibit phosphorus uptake by plants, diminishing fertilizer effectiveness. Hence, salinity testing for imported phosphate fertilizers is necessary.

6. Particle Size: The granularity of phosphate fertilizers impacts both performance and storage longevity. Large particles tend to cake and mold, while overly fine particles become friable, both scenarios reducing efficacy. particle size analysis for imported phosphate fertilizers is crucial.

7. Density: Phosphate fertilizer density, defined as mass per unit volume, affects transportation and storage costs. High-density fertilizers increase shipping expenses, while low-density variants risk resource wastage. Thus, density measurement for imported phosphate fertilizers is essential.

8. Calorific Value: The calorific value refers to the heat released per unit mass during combustion, influencing energy utilization efficiency. Fertilizers with excessive calorific values burn inefficiently, while those with insufficient values generate pollutants. calorific value testing for imported phosphate fertilizers is necessary.

9. Particle Size Distribution: This parameter describes the proportion of different particle sizes within the fertilizer. Uneven distributions promote caking and mold growth, whereas excessively uniform distributions risk particle fragility, both compromising efficacy. Consequently, particle size distribution analysis for imported phosphate fertilizers is vital.

10. Chemical Properties: Key chemical attributes include pH, redox potential, and solubility, all directly impacting fertilizer performance and shelf life. For instance, extreme pH levels compromise stability, while unsuitable redox potentials hinder nutrient absorption. Inadequate solubility leads to caking and mold formation. comprehensive chemical property testing for imported phosphate fertilizers is indispensable.