Why does phosphoric acid turn green? Phosphoric acid produced by the wet process, also known as commercial grade or green phosphoric acid, has a certain level of impurities and can be used more to make fertilizer. Most other applications require more pure phosphoric acid. Refined to a technical degree, phosphoric acid can be used to produce STTPs (sodium triphosphate), drip irrigation fertilizers, various crop nutrients, detergents and animal feed products.
Organic matter is removed from the raw wet process phosphoric acid, which is produced by refining Egyptian phosphate ore with sulfuric acid and using fine powdered coal.
The percentage of organic matter is reduced from 2 – 172 × 10 – 2, for crude phosphoric acid, to 0.108 × 10 – 2 after treatment of 70 g of acid with 600 mg of fine powdered charcoal. When the weight ratio of coal / crude acid reaches 1%, the crude acid is released from the organic matter and changes color from dark brown to pale green. This green color is due to the presence of Fe 2+ ions.
Also, by decreasing the acid concentration, the efficiency of coal in removing organic matter increases. This may be due to the reduced viscosity of the acid as it dilutes, which allows the coal particles to easily diffuse into the environment.
The results of the effect of temperature show that with increasing temperature, the efficiency of coal in the removal of organic matter increases.
This increase also leads to less scaling and an increase in the net surface area for adsorption due to the increased apparent activity of the coal due to the decrease in acid viscosity with temperature.
Forced chemical catalysts are intermediates that are widely used in the paint, photography, carpentry, oil, and textile industries. Extracted from single or multiple mineral compounds, green phosphoric acid is acidic or oxygen-free. Formulated green phosphoric acid is used to maintain stability at standard temperatures.
Green phosphoric acid such as hydrochloric, sulfuric and nitric acids are suitable for laboratory applications. It is affordable and available in dilute or concentrated amounts.
This product can be used in agricultural, industrial and pharmaceutical applications.
Green phosphoric acid is present in anhydrous and juicy varieties and is strong for various synthesis projects.
This method is related to changing the color of phosphoric acid, ammonium phosphate and composite fertilizer and belongs to the technical field of production of phosphoric acid and fertilizer. The obtained phosphoric acid is filled with air by wet method so that phosphoric acid is completely in contact with air and phosphoric acid is obtained by changing the color. Phosphoric acid is used as the main raw material for the production of ammonium phosphate and NPK composite fertilizer, and therefore phosphoric acid is ammonized by discoloration to form ammonium phosphate, which changes color.
Refined phosphoric acid is used to produce composite fertilizer to change the color of the composite fertilizer produced. This method can improve the paint quality of ammonium phosphate and composite fertilizer products.
In Tunisia, a large amount of green phosphoric acid is processed, which contains significant amounts of rare earth elements. This highlights the extraction of many rare earth elements from concentrated green phosphoric acid solutions based on graphene in the core shell. (Nanoparticles, prepared in a simple and cost-effective manner and activated by N-trimethoxycylpropyl) ethylene diamine triacetic acid (TMSEDTA).
Synthesized and functional cor-shell materials are fully characterized by several techniques to evaluate their morphology, size and crystallinity. Raman, FTIR and X-ray photoelectron spectroscopy are used to identify their chemical composition and induced plasma optical emission spectroscopy is used to determine the concentration of soil trace elements before and after the extraction process.
Fe3O4 particles show high efficiency for adsorption of soil trace elements in concentrated phosphoric acid medium. In addition, thanks to the ferromagnetic properties of the particles and the corrosion-resistant graphene oxide layer, the method of adsorption of soil metal, by magnet, from concentrated phosphoric acid is very simple. These promising results, which are based on a direct process, may be useful for industrial phosphoric acid producers to extract rare earths from concentrated acid.