The manufacturing process of ferric chloride (FeCl3) from oxidation and neutralization of ferrous chloride and acid cloru00ecdrico

摘要

The manufacturing process of ferric chloride (FeCl ~ 3 ~) from oxidation and neutralization of ferrous chloride and acid cloru00ecdrico. Patent of invention of a process of manufacture of the ferric chloride (eecl ~ 3 ~). This chemical element is a primary coagulant (high efficiency and low cost) used in the treatment of water.Its function is to group the impurities in the larger particles to undergo sedimentation. The ferric chloride is currently produced by the neutralization of the hydrochloric acid with iron ore, as described by the equau00e7u00e3ol: 6hci + Fe ~ 2 ~ ~ 3 ~? 2feci ~ 3 ~ + 3H ~ 2 ~ (Eq. 1) this reaction needs energy to happen, therefore, it is necessary to supply heat to the system.This is performed by making the product passes the inside of a heat exchanger, heated by a furnace or boiler. It is important that there is excess iron ore, in addition to the stoichiometric ratio for all the acid is neutralized. The excess of ore inserted is separated, at the end of the process, by settling. The density of the ferric chloride is 1.4 g / cmu00ac3u00ac (20 C).The change in the process refers to the use of ferric oxide resulting from the regeneration of hydrochloric acid to replace the iron ore, in the stage of neutralization of hydrochloric acid. The proposal of a new form of production of ferric chloride is producing it from the oxidation of iron chloride as the equau00e7u00e3o2: 2feci ~ 2 ~ + CI ~ 2 ~? 2feci ~ 3 ~ eq.2) the reaction occurs in the interior of the oxidation reactors, the ferrous chloride oxidized by chlorine gas. This process is conducted at ambient temperature and pressure inside the reactors is controlled, reaching up to 25 psi. The steps of the process are well defined, characterizing the process as a batch.The product reaches the steel and is stored in a reservoir, awaiting the start of the processing. The first step of the process is flocculation / sedimentation of the silica present in the raw material, by using an anionic polymer.The product reaches of acesita, with a density of 1.2 g / cmu00ac3u00ac, and goes to a reservoir where it is added to the polymer in a proportion of 2 g of polymer per 1 mu00ac3u00ac of mixture. This is done manually by an operator. In the next step, occurs oxidation. The iron is oxidized by the gas C1 ~ 2 ~ feu00ac + 3u00ac to feu00ac + 3u00ac.Then the silica is decanted, a pump takes the product into a tank of leveling, where is dosed quantity of product to be inserted in the reactor. The step of neutralization of hydrochloric acid by ferric oxide occurs at high temperatures. The product that comes from the stage of oxidation is increased with ferric oxide and agitated while it is pumped into the interior of the heat exchanger.In order to ensure the complete neutralization of the acid, it is necessary to use ferric oxide in excess. The amount of surplus is separated in a third stage: decantation.