Chemical and Petroleum Engineering, Vol. 54, Nos. 1–2, May, 2018 (Russian Original Nos. 1–2, Jan.–Feb., 2018)
0009-2355/18/0102-0075 ©2018 Springer Science+Business Media, LLC
Razumovsky Moscow State University of Technology and Management (First Cossack University), Moscow, Russia; e-mail: sem-post@
mail.ru. Translated from Khimicheskoe i Neftegazovoe Mashinostroenie, No. 2, pp. 5–9, February, 2018.
CALCULATION OF THE PROCESS OF SLURRY
SEPARATION IN THE ROTOR OF A CONTINUOUS
E. V. Semenov and A. A. Slavyanskii UDC 66.011:66.067.5
The process of deposition of the solid phase of a suspension in the rotor of a continuous sedimentation
centrifuge with a rigid wall and periodic discharge of the sediment was investigated based on the provisions
of the hydrodynamics of slow movements. Results of quantitative analysis of the process of centrifugal
separation of the suspension show that the calculation method of the efﬁ ciency of this process should be
improved taking into account the layered structure of the ﬂ ow based on the ﬁ rst model.
Keywords: centrifuge, rotor, sedimentation, suspension, device performance.
Continuous sedimentation centrifuges, or tubular centrifuges (TC), are devices for separating the liquid phase from
the solid with the minimum content of liquid in the sediment. They are used for the treatment of wastewater (containing
chrome, claydite and coal dust, clay, kaolin, shale, pumice, etc.), in the nuclear industry for enrichment of uranium feedstock,
in the chemical and metallurgical production of plutonium for the separation and processing of difﬁ cult-to-ﬁ lter radiochemi-
cal suspensions, and in other industries [1–5].
Sedimentation centrifuges, the distinguishing feature of which is the presence of a continuous rotor, have a number
of advantages over sedimentation tanks: compact size; the possibility of placing them directly in production facilities and
including them in the technological scheme of production; higher clariﬁ cation efﬁ ciency.
Methods for performing sedimentation centrifugation :
1) centrifugation of a separate volume of the suspension without replenishing the suspension and without removing
the fugate and sediment during the process;
2) centrifugation with a continuous supply of the suspension and with the removal of the fugate, but without remov-
ing the sediment during the process; and
3) centrifugation with a continuous supply of the suspension and a continuous removal of the fugate and sediment.
The purpose of this work is to study the process of separation of a suspension in the working volume of a centrifuge
with a continuous supply of the suspension and with the removal of the fugate without removal of the sediment during the
process, i.e., in a continuous sedimentation centrifuge (method 2) based on the model of a layered ﬂ uid ﬂ ow regime in the
rotor of a centrifugal device.
Continuous sedimentation centrifuges for clarifying suspensions are used when the content of high-dispersion impu-
rities is low; when it is necessary to classify solid particles by size and density; when separating resistant emulsions.
The problem of quantitative analysis of the kinetics of the process of separation of a suspension in the rotor of a TC
was considered in [1, 2, 4, 6–10]. However, a number of factors that determine the efﬁ ciency of the separation process have
not been accounted for yet, namely: the features of hydrodynamics of the intra-rotational ﬂ ow; slurry kinetics during process-
ing in the device; formation of a layer of sediment on the rotor wall; optimization of the centrifugation process. To solve these
engineering problems, an accurate method for calculating and predicting the course of this process is necessary.