scholarly journals RESULTS OF MODIFICATION OF CAST IRON BY CARBON NANOSTRUCTURES OF GAS CLEANING DUST OF SILICON PRODUCTION

2018 ◽  
Author(s):  
A.I. Karlina ◽  
V.V. Kondratiev ◽  
A.E. Balanovsky ◽  
A.D. Kolosov ◽  
N.N. Ivanchik
Keyword(s):  
Cast Iron ◽  
Carbon Nanostructures ◽  
Silicon Production ◽  
Gas Cleaning

Ensuring the eco safety of mixing departments steel melting shops

2021 ◽  
pp. 45-51
Author(s):  
V. Kravets ◽  
◽  
S. Padalko ◽  
V. Gorovenko ◽  
◽  
...  
Keyword(s):  
Cast Iron ◽  
Nitrogen Supply ◽  
Dust Collector ◽  
Steel Melting ◽  
Compartment System ◽  
Gas Cleaning ◽  
Aspiration System ◽  
Purification Efficiency ◽  
Low Emission ◽  
New Construction

Introduction. Mixer branches of metallurgical enterprises are an intermediate link between blast furnace and steelmaking workshops. They are equipped with mixers – footer containers for storing cast iron melt. In Ukraine, mixers with a capacity of 1300 or 2500 tons are used. Technological operations are accompanied by emissions of finely dispersed brown smoke and large-dispersed graphite dust into the atmosphere. Problem. Mixer compartments of Ukrainian factories are equipped with aspiration systems that dimity emissions from cast iron pouring and draining units with the help of fume tubes, then emissions pass the dust collector and discharge into the atmosphere through a chimney. The main impact of mixer compartments on the environment is: disorganized emission through an aerodynamic dust lamp, which is not allotted by the aspiration system; organized emission through a smoke pipe of dust not caught by a dust collector; solid waste from gas cleaning and dust hoppers settling on the floor and structures of the mixer compartment from the disorganized ejection that did not come out through the lantern. The main problems are insufficient aspiration (disorganized emission) and low emission purification efficiency (emission through the chimney). A separate problem is the disposal of caught dust. The degree of aspiration in the factories of Ukraine is about 0.7 for the filling unit in the mixer and 0.8 for the drain unit from the mixer at the power of the aspiration system 150-250 thousand tons. This does not meet modern requirements. Results. Cyclones are used as a dust collector in most factories, which completely capture graphite, but are not effective enough for brown smoke. Therefore, it is proposed to use sleeve filters or electro filters. It is also possible to introduce the suppression of brown smoke with nitrogen. The use of nitrogen is possible in accordance with cyclones (for existing systems) or compatible with filters (during reconstruction or new construction). The use of suppression of brown smoke with nitrogen allows to solve the problem of disposal of caught dust, because nitrogen supply leads to enrichment of dust with graphite. The content of graphite increases from 15% to more than 30%, which converts dust from care to commodity product. Keywords: mixer, cast iron pouring, cast iron drainage, dust suppression by nitrogen, aspirational mixer compartment system.

scholarly journals The examination of the aspiration system of the casting yard, bunker overpass, receiving device with transshipment units of the blast furnace «Rossiyanka»

2019 ◽  
Vol 3 ◽  
pp. 20-27
Author(s):  
SHushlyakov D.A. ◽  
Kubyshkin A.V. ◽  
Soldatov D.A.
Keyword(s):  
Blast Furnace ◽  
Cast Iron ◽  
Suspended Solids ◽  
Gas Content ◽  
Iron And Steel ◽  
Gas Cleaning ◽  
Aspiration System ◽  
Quality Product ◽  
Maximum Allowable Concentrations ◽  
Iron And Steel Works

Problems in existing suction systems of casting yard, bunker rack, receiving device with transshipment units of blast furnace number 7 «Rossiyanka» of Novolipetsk Iron and Steel Works are considered. It is noted that the design capacity of the blast furnace was 9 450 tons of cast iron per day, and the blast furnace produces about 13 000 tons of cast iron per day now. The aspiration system was not designed for such a load. The increased dustiness and gas content at the workplaces leads to a number of problems: health of the plant's employees, decrease in product quality, product losses, decrease in labor productivity. It is noted that the dustiness of the air in some points of the workplace of the casting yard exceeds the maximum allowable concentration by 1.2...6 times (which is 7.2...36 mg/m3). The issues of reconstruction of existing suction systems, repair or replacement of installed equipment, improvement of local suction systems are considered. The whole range of activities carried out in the foundry yard and other processing facilities will reduce the dust concentration in the working area to the level of maximum allowable concentrations. Ways to reduce the amount of suspended solids emissions into the atmosphere to the level of 5 mg/m3 on the proposed additional gas cleaning systems are proposed. The proposed reconstructive measures will reduce the total quantity of solid emissions to the atmosphere of Lipetsk by an amount of about 1 794 kg/hour or 11 481 600 kg/year.

scholarly journals Improvement of the Properties of Gray Cast Iron by Silicon Dioxide and Carbon Nanostructures

2016 ◽  
Vol 9 (5) ◽  
pp. 671-685 ◽  
Author(s):  
Victor V. Kondratyev ◽  
◽  
Nikolay A. Ivanov ◽  
Andrey E. Balanovskiy ◽  
Nikolay N. Ivanchik ◽  
...  
Keyword(s):  
Cast Iron ◽  
Silicon Dioxide ◽  
Carbon Nanostructures ◽  
Gray Cast Iron ◽  
Gray Cast

scholarly journals MECHANISM OF ELECTROCOAGULATION OF CHAMBER PRODUCT AFTER FLOTATION OF CYCLONE DUST OF SILICON PRODUCTION

2017 ◽  
Vol 60 (10) ◽  
pp. 68
Author(s):  
Valentina N. Petrovskaya ◽  
Viktor V. Kondrat’ev ◽  
Alexey A. Petrovskiy
Keyword(s):  
Silicon Oxide ◽  
Positive Charge ◽  
Sand Fraction ◽  
Carbon Impurity ◽  
Silicon Production ◽  
Gas Cleaning ◽  
Cleaning System ◽  
Gas Removal ◽  
Aluminum Electrodes ◽  
Micro Silica

Spheroidal micro silica has a large specific-surface. This makes it indispensable for the manufacture of composite materials: construction mixtures, paints, rubber, adsorbents, etc. In the process of studying the properties of dust formed in the production of silicon, it was established that practically all of the quartzite carried away in the form of a fine dust phase into the gas removal and gas cleaning system is represented by spheroidized micro- and nanoparticles of SiO2 with a carbon impurity that is invariably present also in the finely dispersed state. One of the ways to extract carbon and amorphous silicon oxide from the dust cyclone is flotation. As a result of flotation, 29% of the sand fraction, 40% of the foam product enrichedcarbon, and 31% of the chamber product enriched SiO2 were obtained. It is shown that the target nanofraction of amorphous silica from the chamber product after flotation can be extracted by electrocoagulation. The dependence of the mass of the coagulum on the current density on aluminum electrodes was obtained during electrocoagulation of the chamber product. It is established that under the action of current on the system under investigation, the metal of the cathode and the anode dissolve. The mechanism of electrocoagulation is shown. The chamber product is a stable finely dispersed SiO2 suspension with a pH of 8-9. Since the surface of the silica is hydrophilic, OH- is adsorbed on it and the surface of the dispersed particle is charged negatively. As a result of electrochemical and chemical dissolution of aluminum electrodes, the aluminum hydroxide formed has a positive charge. The different particles stick together, as a result of which their dimensions increase, coagulation takes place, and then precipitation occurs.Forcitation:Petrovskaya V.N., Kondrat’ev V.V., Petrovskiy A.A. Mechanism of electrocoagulation of chamber product after flotation of cyclone dust of silicon production. Izv. Vyssh. Uchebn. Zaved. Khim. Khim. Tekhnol. 2017. V. 60. N 10. P. 68-74

The Bursting of Small Cast-Iron Flywheels

1902 ◽  
Vol 53 (1362supp) ◽  
pp. 21824-21826
Author(s):  
Charles H. Benjamin
Keyword(s):  
Cast Iron
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