Iron oxide heat capacity

Tab. 8.3 Heat capacity function coefficients for iron oxides...

In the blast furnace, the iron oxides Fe203, Fe304, and FeO, are successively reduced to iron by CO produced by the reaction of coke with air. Calculate AG° at 1500 K for the reaction FeO(solid) + CO(gas) -o- Fe(solid) + C02(gas), the final stage of reduction of iron oxide in the blast furnace, using the constant heat capacity approximation. 

The other oil-cooled converter had the iron catalyst (iron oxide and other metallic oxides) arranged in a fixed bed and removed the heat of reaction by circulating oil through the catalyst bed. IG Farben tested this converter extensively in a pilot plant of 8-10 metric tons capacity, synthesizing a gasoline with a 62-65 octane number [30],... 

The main OC families are based on the use of nickel, iron, copper, manganese as metal or some mixed metal oxides. The metal oxides are usually mixed with some material support to reduce the diffusion limitations inside the particles (by increasing the particle porosity), to improve the material stability and also increase the heat capacity. The most often used OCs are discussed briefly here. More information can be found in Adanez et al. [9], Hossain etal. [10] andLyngfelt etal. [11]. The main properties ofthe most often used OCs are listed in Table 5.1 [9, 11, 12]. 

Crawford concluded that the specific heat ( capacity for containing heat ) of dephlogisticated air (oxygen) is 4 6 times that of common air. He also concluded that the capacities of bodies for containing heat are diminished by the addition of phlogiston, and increased by the separation of this principle . The ratios of the specific heats of the calces (oxides) of metals to those of the metals were found to be (calx metal) tin, 14-7 10 4, iron 8 3 1, lead 19 9 14 7, antimony ii-6 4-5. 

Semiconductor thermometers can be built in many shapes. Frequently they are very small beads, so that their heat capacity and thermal lag are small. They may also be made in form of large disks, so that they can average the temperature over a larger object. Typical materials which are used in thermistor thermometers are iron oxide, magnesium chromate, magnesium aluminate or sintered mixtures of nickel oxide, manganese oxide and cobalt oxide. 

The solid flow only covers zone D and some mesh elements there are blocked to the solid flow to fit the thickness of iron ore fines layer which are illustrated in Figure 1. Conservation equations of the steady, incompressible solid flow could be defined using the general equation is Eq. (6). In Eq. (6), physical solid velocity is applied. Species of the solid phase include metal iron (Fe), iron oxide (Fc203) and gangue. Terms to represent, T and 5 for the solid flow are listed in Table n. Specific heat capacity, thermal conductivity and viscosity of the solid phase are constant. They are 680 J/(kg K), 0.8 W m/K and 1.0 Pa s respectively. Boundary conditions for solid flow are Sides of the flowing down channels and the perforated plates are considered as non-slip wall conditions for the solid flow and are adiabatic to the solid phase up-surfeces of the solid layers on the perforated plates are considered to be free surfaces at the solid inlet, temperature, volume flow rate and composition of the ore fines are set depending on the simulation case At the solid outlet, a fiilly developed solid flow is assumed. 

Steam Treating of Powder Metallurgy (P/M) Steels. Many P/M parts have traditionally been steam treated for improved wear resistance, corrosion resistance, and sealing capacity. In this process, P/M parts are heated in a specific manner under a steam atmosphere at temperatures between 510 and 570 °C (950 and 1060 °F) to form a layer of black iron oxide, identified as magnetite, in the surface porosity. Magnetite has a hardness equivalent to 50 HRC. 

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