Studies of Acid Activation and Thermodynamic Characteristics of Aluminosilicates in Sorption Process of Phosphorus Release from Sludges

Abstract

One of the actual problems of the phosphoric industry is complex usage of all got raw materials and processing of technogenic waste with receiving products. One of the main waste of phosphoric production are the phosphorus-containing sludges which are formed on stages of condensation of vaporous phosphorus. Despite numerous researches on suppression and processing of phosphoric sludges, today the universal way of their processing meeting the requirements of phosphorus production isn't found yet. In this regard, we offer a sorption method of phosphorus release from phosphorus-containing sludges. Various alumosilicate minerals, including bentonites, vermiculites, refractory clays, etc. can act as sorbents. The specified minerals possess high sorption ability with an advanced surface. Results of thermodynamic researches of heterogeneous system phosphorus -water -solid mineral impurity are given. The thermodynamic probability of the main of reaction and systems characteristic for sorption process of phosphorus release from sludges is shown. For modifying the surface of minerals of the montmorillonite group entering into bentonites and vermiculites acid activation is used. For increase in hydrophilic surface of minerals are considered exchange cations of Al +3 , H + , Na + . It is shown that hydrophilic materials can be received at normal saturation by exchange cations. At its supersaturate hydrophily can reach initial (before processing) values.

Enrichment of mineral raw materials: Selection of local clay minerals for the purpose of obtaining adsorbents for purification of petroleum products

“…As a literature review has shown, to obtain clay adsorbents for the purification of liquid hydrocarbons, mineral oils, paraffins and ceresins, bentonites, palygorskites, opoka-like and hydromica clays, which are available in sufficient quantities in Uzbekistan, are widely used [5,6,7,8].…”

Mathematical Description of the Process of Sorption Treatment of Waste Water of Chemical Productions

“…При этом ион, заряженный положительно, адсорбируется преимущественно на сорбентах с отрицательно заряженной поверхностью, и наоборот. Эти процессы обычно сопровождаются явлением обмена ионами между адсорбентом и раствором -так называемой ионообменной адсорбцией [2][3][4].…”

Process of Obtaining Sorbents from Bentonite and Refractory Clays Using Industrial Wastes

“…The absorption regions at 350°C, 650°C, and desorption at 433°C are determined with method of thermo programmed reduction and hydrogen desorption. Thermodynamic studies of calculating 1,2 Gibbs energy of possible synthesis conversion of sorbent minerals with the addition of oil sludge have established that the greatest thermodynamic probability is characterized by the synthesis of minerals in the presence of C 6 H 6 , and the lowest is in the presence of methane.…”