SU804574A1 - Method of producing alpha-ferric oxide - Google Patents

Description

one

The invention relates to a process for the production of iron oxide, in particular, 0-modifications, which can be used for the production of ferrites and iron garnet.

A known method of producing iron oxide by mixing solutions of ferrous sulfate and ammonium nitrate, heating the mixture obtained to 80-90 seconds, additional supply of ammonia water into it, separating and casting the resulting magnetite and calcining it at 550-600 with p. .

However, this method is quite lengthy and multistage.

There is also known a method for producing iron oxide, which involves the high-temperature decomposition of a pickling hydrochloric acid solution during combustion of a combustible gas at a temperature of about 550-650s, followed by washing the pigment in three stages with a countercurrent water vapor condensate at a solid concentration of 300-350 in its suspension .

The disadvantage of this method is the complexity due to the need for a long and time-consuming operation, washing the target oxide product

in order to improve its pigment properties.

The purpose of the invention is to simplify the process of producing iron oxide with Fe O by eliminating the operation of npONOiiBKH and improving the magnetic properties of the target product.

The goal is achieved by the method of obtaining iron oxide d

0 FiejOi of high temperature at 550 BBO C decomposition of a hydrochloric acid solution containing iron chlorides, and with a mixture of demineralized water and absorbing oil introduced into it,

5 represented itself a product barely. blowing chemical composition: naphthalene 15-18: B-methylnaphthalene 7-10; JT methylnaphthalene 4-7; 2,6 - dimethylaftapine 8-10; 1/7 - dimethylnaphthalene

0 3-7: azentafta y 18-20; difenkoksnd 12-15j И8ДОЛ 21-23 and anthracene 2-4 with sogerzhaiii 9th oil in qntecH in the amount of 10-2C mg / l. -. , Thus, the proposed method simplifies the production of oi-Pe oxide O by eliminating the operation of its V & OVSSBKVI,

The resulting product at the same time has a specific surface area that

Claims (2)

0 contributes to the improvement of its magnetic properties, since the value of its residual magnetism and coercive force is 1.5–2 times higher than that of the known. In addition, the samples of the proposed iron oxide have higher values of the rectangular hysteresis loop and 1.8–2 times smaller dielectric losses. Winner To the treated pickling solution containing in g / l: FeC12300-400 iron chloride, FeCl3 40-60 ferric chloride and Saline HC1 - 100-120, as well as impurities of sodium, calcium, magnesium, aluminum, silicon and MapriaHua in amounts of 15.110.180, 10.15 and 18 mg / l, respectively, a mixture of desalted water and absorption oil of the specified composition is introduced with the content of the latter 20 mg / l to a 1: 2 ratio of this mixture to the initial solution. The resulting liquid mixture is fed into the reactor and subjected to its high-temperature decomposition at 550-650 with the formation of red iron oxide in the form of a fine mixture deposited in the lower part of the reactor. Waste gases from the reactor with a content of 1,160 kg / h HC1, 3280 kg / h HgO, 31-5 kg / h O and 5368 kg / h N are sent to a recuperator, from which these gases are fed at the bottom of the absorption column. On top of this column, water is supplied with a flow rate of 500 l / h and thus provides for the condensation of hydrochloric acid vapor, which is collected in the lower part of the column with a content of 10–20 mg / l of absorbing oil and is pumped into pickling baths. The proposed method is economical, since with its considerable simplification it provides the production of a pure iron oxide product suitable for use in electronic engineering. Formula 1. Invention method for producing oL iron oxide comprising the high-temperature decomposition of hydrochloric acid solution containing iron chloride at 550-650 C, characterized in that, in order to simplify the process by eliminating the operation of the Pre1 ' 1Ki and improve the magnetic properties of the target product, the mixture is introduced into the initial hydrochloric acid solution. demineralized water and absorption oil with the content of the latter in the amount of 10-20 mg / l. 2. A method according to Claim 1, which is also distinguished by the fact that a product of the following chemical composition, wt.% Is used as absorption oil: naphthalene 15-18 j (-methylnaphthalene 7-10y jr-methylnaphthalene 4-7; 2,6-dimethylnaphthalene 8-10- 1,7-dimethylnaphthalene 3-7-, acenaphthalene 1820; diphenyloxnd 12-15; indole 21-23 and anthracene 2-4. Sources of information taken into account at examination 1. Authors certificate of the USSR 604824, class C 01 G 49/04, 1973. 2. Authors certificate of the USSR 2484293, cl. from 09 On 1/24, 1977.