CBU - Efficient Solution For HydroMetallurgy

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Alkaline fumes, sulfuric acid aerosols, hydrocyanide (hydrogen cyanide, prussic acid), mercury, chlorine, nitrogen oxide, sulfur dioxide, inorganic dust - this is by far a not complete list of hazardous materials subject to purification at the gold-processing plants (GPP) prior to release into the atmosphere. Cyanides are used in gold processing more often than other chemical elements because they are capable of absorbing up to 97% of the yellow metal, including the finest particles invisible to an unaided eye.

The downside of the cyanide technology is that even in small quantities they are prone to causing death in organisms – just a teaspoon of 2% cyanide solution is enough to cause fatality in an adult.

Therefore, the issue of GPP atmospheric emissions purification is extremely relevant, and requires the most designated approach. An efficient solution of this task is a patented development of engineers from Novosibirsk - Centrifugal Bubble Units (CBU).

CBU is a unit for perfect mixing of gas and liquid. Principle of CBU operation is based on gas flowing through rotating liquid layer held in turbulence chamber by gas flow and centrifugal force.

Advantages of the CBU:

1) High heat and mass exchange ratio (i.e. high efficiency) due to:

  • high gas velocity (way higher than in other units), increasing phase contact specific area by dozens (phase contact specific area in the CBU amounts to SEVERAL THOUSAND!!! m2/m3; chemical reaction volumetric rate in the CBU is 40-60 times higher than in regular bubble columns due to intensified mass transfer);
  • varying velocities of liquid and gas movement in the bubble column that enable liquid to constantly carry the reaction products away from the gas-liquid interface boundary.

2) Small size. With the same output, the CBUs have smaller dimensions compared to other units: diameter and height of a CBU with a gas output of 50,000 m3/hour is 2,100 and 4,100 mm respectively; and weight of such unit is only about 2,100 kg.

3) Simple and reliable structure:

  • no rotating assemblies;
  • no spray nozzles (get clogged often), which does not set strict demands to liquid quality; spray nozzles clogging is a constant headache around collecting coalescent dust particles or using caking absorbing agents;
  • liquid pressure value at the input to the CBU is not important (liquid pressure value at the input to units equipped with spray nozzles is strictly specified).

4) Self-similar operation mode of the CBU at fluctuations in gas discharge – the higher is gas discharge, the higher is centrifugal force holding the bubble column, where heat and mass exchange processes run (therefore, a possibility of the bubble column breakdown is completely eliminated, because it becomes even more stable).

5) Lack of drop enairment due to efficient separating area designed for separation of liquid phase from gas. Therefore, the CBU does not require supplementary drop-collecting extensions in the system.

CBU can be used in various fields: mining and processing, power industry, metallurgy, chemistry, petrochemistry, oil refining, agriculture, building materials manufacture, mechanical engineering etc.

Summary of industries used our gas handling equipment during 5 years period

year company model q-ty what are we removing from flue gas summary m3 per hour
2016 г. Ekros-Engineering, JSC CBA-12.5T-2 1 NO2, suspended solids 268000,00
2017 г. UralStroyKomfort, OJSC CBU-4T-1x2 1 Na2SiO3
2017 г. SibMashPolimer, OOO CBA-12.5T-2 2 H2SO4, HF
2018 г. Zircon, OOO CBU-1.5T-3 1 HF pairs
2018 г. Soya Center, OOO CBA-10T-2 1 air cooling
2018 г. UNIHIMSOZ, JSC CBU-0.5T-3 1 NH3
2018 г. UNIHIMSOZ, JSC CBU-7T-3 1 NH3
2019 г. Explosion Institute, JSC CBA-0.5T-2 1 NaNO2, NaSCN
2019 г. Buisky Chemical Plant, OJSC CBA-1T-3 1 NO2 vapor
2020 г. "Neftekhim", NPP CBU12.5T-3 1 SOx
2021 г ILIM goup, cellulose processing Bratsk CBE-45T-3, CBE-50T-3, CBE-25T-3 3 dimethyl disulfide, dimethyl sulfide, turpentine, H2S
2021 г ILIM goup, cellulose processing Ust-Ilimsk CBE-0,5T-3, CBE-9T-3 2 methanethiol, dimethyl disulfide, dimethyl sulfide, turpentine, H2S
TOTAL units for chemical factories 16
2017 г. SPC Gas Turbine Engineering SALUT, JSC CBA-1T-1 1 oil mist 77000,00
2018 г. Renovation, OOO CBA-9T-1 1 suspended particles
2018 г. TradeCom, OOO CBA-10T-1; CBA-6T-1 6 coal dust
2017 г. SIBERIAN MECHANIKA, LLC CBU-1T-1 1 blow off
Total units for different 9
2018 г. ELECTROConnect, LLC CBA-2T-2 1 NH3, HCl, copper and tin compounds 9000,00
2019 г. Ekorusresurs, OOO CBU-7T-3 1 phenol, formaldehyde
TOTAL units for electronic industry 2
2016 г. MetPromMontazh, OOO CBU-12.5T-2 4 suspended particles 50000,00
TOTAL units ferrous processing 4
2016 г. Alterra, OOO CBA-5T-2 2 suspended particles 73000,00
2017 г. SovPlym-Kazakhstan, TOO CBA-20T-2 2 suspended particles
2018 г. Tekhprommash, JSC CBU-5T-3 1 Cl, Na3AsO4
2018 г. Troika, OOO CBA-3T-2 1 flue gas cleaning
2019 г. Profklimat, OOO CBU-15T-2 1 suspended particles
TOTAL for metal processing factories 7
2016 г. Mine Solovievsky, JSC CBU-5T-2 1 suspended solids (dust, Na2CO3), NO2 79500,00
2017 г. Rosmet NPP, JSC CBA-17.5T-2 1 suspended particles
2017 г. Energoprom JSC CBU-9T-2 1 nickel sulfate
2018 г. Resource, oil and gas complex, Polyanka field CBU-5T-3 1 HCN, NaOH
2018 г. Resource, oil and gas complex, Polyanka field CBU-6T-3 1 HCN, NaOH
2018 г. Novoangarsk dressing plant, OOO CBA-15T-2 1 suspended particles
2019 г. Schelkovo plant VDM, JSC CBU-2.5T-3 1 NOx, HCl, Cl2
2020 г. "UMD Learding" CBU-17.5T-2 1 suspended particles or ores
2021 г "PolyusGOLD" Gold mining factory CBU2T-3 HCN
TOTAL units for non-ferrous metals 8
2017 г. Petroleum, OOO CBA-3T-3 2 H2S 3000,00
2016 г. SovPlym-Siberia, OOO CBA-10T-1 8 suspended particles 254000,00
2017 г. Gorteplo, OOO CBA-25T-2 1 NO2, suspended solids
2018 г. SovPlym-Siberia, OOO CBA-9T-1 4 suspended particles
2019 г. Gorteplo, OOO CBA-12.5T-2 1 NO2, suspended solid particles
2019 г. SUEK-Kuzbass, coal mining CBA-50T-2 2 suspended particles, SO2, NO2
2019 г. Sovplim-Siberia, OOO CBU-1T-2 1 suspended particles
TOTAL units for thermal plants 17
GRAND TOTAL units & capacity 63 813500,00