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The results showed that copper and cobalt contents in cleaned slag could decrease averagely to 0.18% and 0.071% respectively after cleaning. 91.99% Cu and 92.94% Co and less than 38.73% Fe were ...
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The smelting process of blast furnace is carried out in the shaft furnace of a closed countercurrent reactor and heat exchanger. The complex physical changes and chemical reactions are completed in the process of the countercurrent movement of the charge and gas in which the raw materials containing iron oxide (sinter, pellets, etc.), …
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Fig. 13 depicted the phase diagram for the CaO-MgO-Al 2 O 3-SiO 2-FeO, highlighting the original slag in the coal-coke-slag at the tuyere 's nest area of the blast furnace (S0), alongside the slag with target basicities of 0.80 and 1.00 (S1 and S3, respectively), and the interface slag with target basicity of 1.20 (I5).
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The initial study to control the coal rate injected into a slag-cleaning furnace (SCF), based on a soft sensor, was developed at Caletones Smelter, Chile. The old …
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2.1 Carbon Injection into EAF slags In modern EAF steelmaking, carbon in the form of coke, char or coal, is injected into the furnace and reacts with slags (FeO/Fe 2O 3, CaO, …
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Intelligent sensor for coal powder rate injection in slag cleaning furnace 779 During the vessel discharge, the operator tries to maintain the coke flowrate by manipulating the set point of the pressure controller on the nitrogen line. Sometimes the blow valve is used to reverse the coke compactness in the lower part of the cone.
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In parallel test runs in the pilot scale EAF of IME have been conducted in order to demonstrate the feasibility of a slag cleaning treatment by coke injection. It has been found that the...
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Metal Losses to the Slag in Smelting and Converting. 80% of the copper produced from ores worldwide originates from sulfide ores. The copper concentrate which results from flotation of the ore is typically smelted and converted to blister copper [].During smelting S and Fe are oxidized, where SiO 2 is added to form a liquid ferric or ferrous …
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Within 5 min after charging the nut coke sample, the slag layer had grown 369%, and reached the content capacity of the furnace before another height measurement could be taken. ... Based on the maximum slag ing, the injection carbon types were ranked from most effective to least, as follows: nut coke, bio-briquette, IIC, and loose …
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A fundamental aspect of achieving cleaner production revolves around enhancing the interface between blast furnace gas and the central charge column. ... accelerated the combustion rate of pulverized coal and enhances the dissolution rate of flux into the coal-coke-slag mixture. (3) The combined injection strategy, involving both …
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Reduction of copper oxide is an important step of metal recovery and slag cleaning in copper production. This can be achieved by slag treatment with injected reducing agents.
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The first treatment improved slag cleaning directly in the submerged arc furnace (SAF) using coke injection. The benefit of this process in comparison to the traditional method is that it ...
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At present, coke and anthracite coal are mainly used in EAFs for the slag ing practice and inserted in the process as powder by means of pneumatic injection [4].
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Coke oven gas mainly contains CH 4 and H 2, to make better use of coke oven gas, researchers prepared a cheap anti-sintering CaO-based adsorbent from steel slag, and was used in coke oven gas reforming for experimental research. The experimental results showed that 1 g adsorbent could capture 0.72 g CO 2, which had a …
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The reduction of lead-rich slag with metallurgical coke is one of the major reactions in the dripping zone of the lead blast furnace. However, because the conditions of this zone are hard to ...
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First, it provides the theoretical analysis of requirements that ensure minimum coke and carbon rates, and minimum CO 2 emissions. Then it focuses on the injection of selected ARA, such as pulverized coal, biomass products, and hydrogen containing gases – natural gas, coke oven gas and pure H 2. Conversion behaviour of mentioned ARA and ...
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In parallel test runs in the pilot scale EAF of IME have been conducted in order to demonstrate the feasibility of a slag cleaning treatment by coke injection. It has been found that the pro-cess ...
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By Dr. Fathi Habashi If organic chemistry is the chemistry of carbon, then ferrous metallurgy is the technology of carbon. Carbon in the form of coal is used in metallurgy as a fuel, but the major use is to make coke that is an essential component of the feed to iron blast furnaces. For each ton of iron produced, half a ton of coke is used. …
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The use of an electric arc furnace for recovery of metal values from slag generated in a secondary copper smelter has been successfully demonstrated and commercialized. Blast furnace slag containing about 1.5% Cu, 1.0% Pb, 3.5% Zn, 1.0% Ni, 40% FeO and 1.0 opt Ag was retreated to recover better than 75% of the metal values. The addition of …
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A large number of graphite crystals (gray phases in Figure 1(a)) as well as slag particles (white phases in Figure 1(a)) were observed on the surface of coke samples. The graphite crystals were present in various morphologies including flake (Figure 1(b)), plate (Figure 1(c)), columnar (Figures 1(d), (e)), which are similar to the forms of natural …
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Assuming a coke consumption of 350 kg coke per tonne of hot metal and replacing it with 5% torrefied biomass injected as PC with an additional 100 m3/tHM biogas injection, the BF's CO2 emission related …
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Massive copper slag containing heavy metals is produced in copper making and 0.5 - 8.0 wt% Cu is lost into it, deserving to be recovered. In this study, the waste coke and gypsum were employed to clean the copper slag, the lost copper was reduction-sulfurized and enriched to the matte droplets. Howe …
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DOI: 10.1016/j.fuel.2023.130492 Corpus ID: 265538693; Evolution and modification of physicochemical properties of coal-coke-slag powder within the tuyere 's nest area of a blast furnace
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1 School of Environmental and Municipal Engineering, Qingdao University of Technology, Qingdao, China; 2 Shanghai Engineering Research Center of Solid Waste Treatment and Resource Recovery, Shanghai Jiao Tong University, Shanghai, China; 3 School of Metallurgy, Northeastern University, Shenyang, China; Copper slag is a solid …
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In the trials the injection coke for slag ing was replaced by an HDPE/coke blend. About 22 heats could be evaluated in comparison to standard operation. The use of the HDPE/coke blend led to a better slag ing according to visual observations, a reduced specific energy consumption (–3%), a reduced power-on time …
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In this work, a new innovative slag cleaning technique was presented to economically and environmentally friendly recover valuable metals from cobalt-bearing …
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A powder injection device was purpose-made to inject additives into molten slag in dispersion state, and a laboratory experiment was carried out to simulate this …
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adding carbon/coke or by injection of various reductants (e.g., different types of oil or natural gas). Reductants are traditionally introduced into a metallurgical vessel such as a copper slag
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When using one injection lance, the maximum injecting quantity is 10 000 N cum/h. If the injection amount is higher, part of the gas will not combust in the tuyere but will enter into the blast furnace unburned. For two injection lances, the maximum injecting quantity is increased to 15 000 N cum/h, due to better combustion conditions.
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