Iron oxide process

Fig. 1. Iron oxide process where Kl represents the iron oxide sorbent bed ( ), the adsorption system and (-...

The zinc oxide [1314-13-2] process is similar to the iron oxide process. There is, however, one key distinction. The zinc sulfide [1314-98-3] ZnS,... 

Stripping of CO2 may also cause iron to precipitate, normally as iron hydroxide. That type of precipitation will also occur if an reduced type of water is entering the well from one side and an oxidized type from the other side. A third and obvious iron oxidation process will take place if reduced water gets in contact with oxygen. 

See iron oxide process iron sponge, spent. 

The Fischer-Tropsch process requires synthesis gas in which the total sulfur does not exceed 2.0 mg./cubic meter. This purification was done in two stages (1) Removal of hydrogen sulfide and (2) removal of organic sulfur. The removal of hydrogen sulfide is almost universally carried out by the well known iron oxide process. At the Luetzkendorf plant, the so-called Alkazid process had been installed, in which a solution of an alkaline organic compound absorbs the hydrogen sulfide, which is then continuously stripped from the solution by steam. At Luetzkendorf, the evolved hydrogen sulfide was converted into elemental sulfur. 

Removal of larger amounts of hydrogen sulfide from gas streams requires continuous processes, such as the Ferrox process or the Stretford process (Mokhatab et al., 2006 Speight, 2007, 2008). The Ferrox process is based on the same chemistry as the iron oxide process except that it is fluid and continnons. The Stretford process employs a solution containing vanadinm salts and anthraqui-none disulfonic acid (Maddox, 1974). 

Sulfur recovery catalysts. Sulfur reclaim is to transform the acidic gas containing H2S produced during processes into sulfate, and then sulfate is recycled. The sulfur recovery has many methods, such as iron oxide process, ADA process, G-V process, hypermanganate process, dichromate process, catalytic combustion process and Claus method etc. Herein, the Claus method will be introduced briefly. 

Iron Oxide Slurries. The chemistry of this type of process is essentially identical to that of the dry iron oxide process. The principal advantage is the ease of removing and replacing the spent reactant. 

The iron oxide gas purification process is one of the oldest methods used for the removal of objectionable sulfur compounds from industrial gases. Around the middle of the nineteenth century, the iron oxide process was introduced in England to replace a wet purification process utilizing calcium hydroxide as the active agent. The iron oxide process gained widespread use in Europe and the U.S. for the treatment of coal gases, but began to lose... 

During its period of widespread use for the purification of coal gas, the iron oxide process was subject to numerous modifications and improvements. The major forms of the process can be categorized as follows ... 

The reduction of iron oxides to yield metallic iron is perhaps the technologically most significant gas-solid reaction system. At present the overwhelming portion of the iron oxides processed is being reduced in the iron blast furnace. Worldwide hot metal production in the blast furnace was 551,000,000 tons in 1971 [1]. The corresponding figure for the United States was 95,000,000 tons [1]. 

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