MELANGETM technology of the bitumen production in one-stage without oxidation

The innovative technology MELANGETM allows produce of the bitumen in one stage with the required properties, according to the technical request of the Customer, from the heavy oil residue basis on the use of physical and induced by them chemical processes. In this case, the main physical processes are heating and homogenization of various heavy residues upon heating, that is, mechanical mixing, almost to an ideal state, in parallel with the addition of a polymer capable of forming long spirals and chains in dispersed media. The experimental work was the basis for the trial production of bitumen according to the European standard BDS EN12591: 2009, which was successfully implemented using the MELANGETM technology at the LUKOIL Neftochim Burgas AD refinery (Burgas, Bulgaria). The heavy unreacted fluidized bed hydrocracking (VTB) residue of the Axens France H-oil process was used as feedstock. Based on the results of experimental work and the basis of confirmed data from the Customer, a patent of the Russian Federation No. 272118 " Method of producing road bitumen from a heavy residue" was issued. MELANGETM technology allows solving the problem of utilizing low-margin heavy oil residues, including unconverted residues from high conversion of oil residues, into high-margin products such as road bitumen and bituminous binders.

Studying the possibilities of improving centrifugal separation efficiency

Object and aim of research. One direction in improving valuable components extraction in centrifugal separation is to apply it in the scheme of circular concentration. By means of multiple passing of a pulp flow through the centrifugal separator, higher indicators of valuable component extraction in heavy residue are ensured. The aim of this research is to study the possibility of improving the efficiency of centrifugal separation based on float circulation. Methodology. Laboratory testing has been carried out to cope with the given task. Centrifugal separation has been fulfilled in a laboratory fortex formation centrifugal separator K-200VL under the cone rotation 86 "Izvestiya vysshikh uchebnykh zavedenii. Gornyi zhurnal". No. 3. 2020 ISSN 0536-1028 frequency of 1000 r/min. Hydrocycloning has been carried out in cyclone separator GTs-75 with the apex diameter of 1.7 cm. The obtained concentrate and tailings were subject to gold assay test. According to the results of the assay test, the calculation of gold extraction in heavy residue and float has been fulfilled. Summary. The obtained result testifies to high efficiency of the proposed technical solution. The proposed technical solution ensures improved efficiency of the process by means of increasing the extraction of particles of increased density in the concentrate when increasing its quality and reducing specific water consumption for the process

Probing the Nuclear Equation of State with Peripheral Heavy Ion Collisions at Fermi Energies

A systematic study of quasi-elastic and deep-inelastic collisions at Fermi energies is presented with the aim of obtaining insight into the underlying dynamics and the nuclear equation of state (EOS). Comparisons of experimental heavy-residue data to detailed calculations using the semiclassical microscopic model CoMD (Constrained Molecular Dynamics) are shown. The CoMD code implements an effective interac- tion with a nuclear-matter compressibility of K=200 (soft EOS) or K=380 (stiff EOS) with several forms of the density dependence of the nucleon-nucleon symmetry potential and imposes a constraint in the phase space occupation for each nucleon, restoring the Pauli principle during the collision. Preliminary results from these comparisons point to a soft equation of state (K=200) with a rather stiff density dependence of the isovector part (symmetry energy).