Exothermic reactions thermite process

Known as the thermite reaction, this process is so strongly exothermic that the iron is produced in the molten state. In this case, the replacement Fe3+ by Al3+ is very favorable because Al3+ is a smaller, harder, less polarizable ion, so this reaction is in agreement with the hard-soft interaction principle (see Chapter 9). 

Self-propagating reduction reactions Several oxide reduction solid-state reactions have been known for a long time. Starting materials are considered which react together highly exothermically. Once the reaction is initiated, enough heat is produced for very high temperature to be attained, and complete reaction occurs rapidly. The so-called thermite process corresponds to the reactions ... 

Manganese(lI,III) oxide is reduced to manganese metal when heated with powdered aluminum (the Thermite process). The reaction is vigorous and exothermic ... 

Reactions of A1 with halogens at room temperature or with N2 on heating give the Al(lll) halides or nitride. Aluminium is often used to reduce metal oxides, e.g. in the thermite process (equation 12.5) which is highly exothermic. 

When the temperature of the SHS process exceeds the melting points of all product components, the product can be highly dense without the use of external pressure. Such products are referred to as cast SHS materials and are primarily the result of thermite reactions [36]. However, in other than these extremely exothermic reactions the products tend to be highly porous. While this is probably the most important disadvantage of the SHS process, it can actually be an advantage in some special cases, as in the synthesis of electrode materials [37], A direct relationship between the initial and the final densities is observed, see Fig. 26 for the case of TiC [30]. However, attempts to use highly dense reactants, taken as a step towards ameliorating... 

A1 + Fe203 —> AI2O3 + 2Fe The reaction is highly exothermic and the increase in temperature is sutBcient to melt the iron produced, it has been used for localized welding of steel objects (e.g. railway lines) in the Thermit process. Thermite is also used in incendiary bombs. 

The reaction between powdered aluminum and iron(lll) oxide (in the thermite process) producing molten iron is veiy exothermic. 

An intimately powdered mixture, usually ignited by magnesium ribbon as a high-temperature fuse, reacts with an intense exotherm to produce molten iron and was used formerly (before the advent of gas or arc welding) in the commercial thermite welding process. Incendive particles have been produced by this reaction on impact between aluminium and rusty iron. (The term thermite reaction has now been extended to include many combinations of reducing metals and metal oxides) [1], Some accidents in demonstrating the thermite reaction are described [2],... 

Thermit Also spelled Thermite, and also called the Goldschmidt process. The reaction of metallic aluminum with a metal oxide is very exothermic and can be used to liberate other metals from their oxides, or simply as a source of heat. In the latter case, iron oxide is used ... 

The thermite reaction has solid aluminum powder reacting with iron(lll) oxide to make aluminum oxide and iron. The reaction is so exothermic that the iron product is usually molten initially. Write the balanced chemical reaction for the thermite reaction and determine the A S for the process. Assume standard conditions. 

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