Method of recovering iron-bearing materials

 

(57) Abstract:

The invention consists in that the recovery of the iron-containing material is carried out by processing the original artificial or natural iron-bearing materials with gaseous reducing agent in two stages. The first stage of processing is carried out at 250 - 350C in humid flue gases coming from the implementation of the final stage of processing. In the first stage receive intermediate. The second stage is carried out at 350 - 450C in a purified hydrocarbon gas. 2 Il. , 1 table.

The invention relates to powder metallurgy, in particular the production of highly dispersed iron powder materials having a high surface activity and used as biologically active agents or catalysts.

Known physico-chemical processes occurring during the recovery of iron compounds with gaseous reducing agents, primarily hydrogen. It is shown that according to the principle of sequence transformations A. A. Baikov, the transition to higher oxide in the lowest education at the end of the process of metal passes through the successive formation of all stable in these conditions2O3-> Fe3O4-> FeO -> Fe, and at temperatures below 572aboutWITH

Fe2O3-> Fe3O4-> Fe. However, in accordance with the state diagram of Fe-O system are not only lower oxides and metal, but also a number of solid solutions.

For recovery of ferrous materials in addition to hydrogen using natural gas. There is a method comprising granulating iron oxides with subsequent restoration of granules in a purified from moisture converted natural gas at temperatures of 650. . . 700aboutWith, and pre-gas is heated to a temperature recovery.

Installed fundamentally important pattern, confirming that the reduction products of iron-containing materials, the content of metallic iron and total iron calculated on the pure substance is a straightforward dependence for each of the options.

The closest technical solution adopted for the prototype, is a method of recovering iron-bearing materials with a mixture of hydrogen and carbon-containing gas at temperatures of 800. . . 900aboutC, and as a carbon-containing gas use Ki allows us to conclude, the recovery of iron-containing raw materials with gaseous reducing agents receive powder materials for various purposes with the service characteristics, not exceeding values: Specific surface area, m2/g 13,0 total iron Content, % 90,0 metallization of 0.85, and receive materials the content of iron metal and iron General is straightforward according to each of the options.

The purpose of the invention is to reduce costs when recovery of ferrous materials, the expansion of the range of the feedstock and the resulting materials, the increase in the dispersion of the obtained powder materials.

Reduce costs when recovery is achieved by reducing the temperature recovery and use as a gaseous reducing agents along with well-known available hydrocarbon gases such as propane-butane mixture; expanding the range of raw materials is achieved using well known materials such artificial and natural compounds of iron as iron hydroxide, Buffy ores Bashkir iron ore district or, for example, waste sulfuric acid processing prokatno ochkovyh materials with a specific surface area of up to 55 m2/g, the total iron content of up to 95% , the obtaining of materials with specific properties, for example, biologically active agents.

The goal is solved by the recovery of raw materials in two stages.

The first stage is obtaining the intermediate product is carried out at temperatures of 250. . . 350aboutWith wet flue gases coming from the second stage to obtain the target product. The second stage is the final recovery of the intermediate is carried out at temperatures of 350. . . 450aboutWith in a purified hydrocarbon gas.

In Fig. 1 shows the sequence of implementation of the two-stage recovery of iron-containing raw material; Fig. 2 - characteristics of recovered materials prior level of technology and obtained by the proposed method.

The scale values of the specific surface materials are shown on the left vertical axis, and the scale values of the content of metallic iron on the right vertical axis. Point 1. . . 5 correspond to the characteristic values of total iron in the reduction products.

P R I m m e R. the Best variants of the invention can be considered as the restoration of the chemical reagent - Gidaspov raw materials hydroxide of iron and natural raw materials - Buffy ore obey the same physical and chemical laws, as Buffy ore is a natural hydrated compound of iron. So henceforth, these compounds combine the General definition of hydroxide of iron and taken together. It should be noted that Buffy ore pre-screened to sizes of 200 mesh.

Thus, in accordance with the scheme shown in Fig. 1 use technological device, consisting of two retorts recovery and gas supply, allowing to supply the reducing gas through the retort in A retort B, and through the retort B in the retort A. retorts "Tandem" has the ability to pre-heat the reducing gas.

After the withdrawal of the device on the current mode, the method is as follows.

In the retort A (see Fig. 1) at a temperature of 400aboutWith the flow of purified natural gas conducting the second stage of recovery. The restoration is subjected to an intermediate obtained at the preliminary stage and representing the content of total iron 68. . . 73,5% , which corresponds to a mixture consisting of 1. . . 5% iron metal is th material with the total iron content of 90. . . 95% , which corresponds to 80. . . 90% of the iron content of the metal.

In the retort B at the same time at 325aboutWith the flow of wet flue gas to restore the original raw material to the state intermediate. Characteristics of the intermediate described above.

Then the target product upload, download feedstock, switch the flow of reducing gas and continue to carry out the proposed method. The recovery process can be performed continuously, if necessary, stopping after the next stage.

Results recovery of iron hydroxide in the table.

For clarity, the data obtained in comparison with the data of the preceding analysis of the prior art shown in Fig. 2. The dependence of the specific surface area obtained by the proposed method materials (curve 1, the scale on the left vertical axis) on the content of total iron and the properties pane, in which are placed the materials obtained according to the preceding methods of the prior art (hatched area in Fig. 2). Clearly shows the expansion of the range of the obtained materials and increase their dispersion. The dependence of the iron content meta is Ala on the right vertical axis), and by the way-prototype - curve 3. It is seen that the materials obtained by the proposed method, contain large amounts of iron metal than the material obtained by the method prototype. Isolation of iron metal in the implementation of the proposed method starts at lower values of total iron. It is allocated to a complete translation of the source of raw materials in the state of magnetite, which is a fundamentally important point.

These materials, in addition to the traditional use areas of powder metallurgy, can be used as biologically active substances. If greenhouse soil with roots of seven-day seedlings of wheat absorbs 5,54 ml/kg.h of oxygen and after treatment of wheat seeds known stimulator of Nikiana - 6,59, after seed treatment products recovery hydroxide iron soil with roots of seven-day seedlings of wheat absorbs 6,90 ml/kg.hours of oxygen. More intense breathing system soil-plant testifies to strengthening of the processes of synthesis in the root system.

As a result, 10. . . 12 days shortened vegetation period of plants and 15. . . 20% increases its yield. (56) the Author's witnesses is ABOUT the RECOVERY of IRON-containing MATERIALS, including the processing of gaseous reducing agents, characterized in that the treatment of synthetic and natural iron-bearing materials are in two stages, the first stage is carried out to obtain the intermediate product at 250 - 350oWith wet flue gases coming from the implementation of the final stage of processing the intermediate product, and the second stage is carried out at 350 - 450oWith in a purified hydrocarbon gas.

 

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