Method of manufacturing coal agglomerates used in the furnace direct iron ore smelting reduction plants

 

(57) Abstract:

The invention relates to a method of manufacturing coal agglomerates, in which fine coal aglomerados at high temperature. Fine coal, which is obtained from the process of direct iron ore smelting reduction plants, can be agglomerated in a simple way by heating it to 600oC or higher for 5 minutes or more. In addition, with fine coal can be mixed anthracite, which does not stick together, or free swelling coal having a low index of free swelling, as a consequence, it becomes possible to use even a very low-quality coals. In addition, the coal, which is heated to a high temperature, is placed in the upper part of the furnace direct iron ore smelting reduction plants, and therefore the profiled section of the arch of the furnace is heated by natural means, which leads to energy savings. 2 c. and 4 C.p. f-crystals, 3 ill.

The invention relates to a method of manufacturing coal agglomerates used in the furnace direct smelting reduction plants. More specifically, the present invention relates to a method of manufacturing coal agglomerates, in which fine coal AG is where it is refuelled as an energy source, must have a uniform particle size (8-35 mm).

However, 50% of coal or greater amount, which serves and is used in the furnace direct smelting reduction plants, is a fine coal having a particle size of 8 mm or less. Such fine coal flows into the line of generating gas when it enters the furnace, and therefore the fine coal is useless.

Fed conventional coal is subjected to the classification of particles by size, and the agglomerates having a size of 8 mm or more, is served after dehydration in a furnace smelting reduction plants. However, the fine coal having a particle size of 8 mm or less, may not be used.

Therefore, if in the process of smelting reduction plants it is necessary to use fine coal having a particle size pieces 8 mm or less, it must first be glomerulopathy.

How agglomeration of fine coal is described in U.S. patent N 3869350, and it relates to a method of heat treatment of coking coal. In this way the fine coal is introduced into a tube in which high-temperature gas flows, resulting in fine coal aglomerated.

About the mo device for supplying high-temperature gas, and the rate of temperature rise should be 100oC/sec.

To solve the above problems, the applicants of the present invention have carried out a large number of studies and experiments on the basis of such studies and experiments have established this invention.

Therefore, the aim of the present invention is the provision of a method of manufacturing coal agglomerates used in the furnace direct smelting reduction plants, which use the propensity of coal to sumarokovskiy due to its samozlepny during the process of thermal decomposition, so that the fine coal can be glomerulopathy at high temperature in a simple way.

Another purpose of this invention is the provision of a method of manufacturing coal agglomerates used in the furnace direct smelting reduction plants, in which anthracite or slightly svobodnenskoye coal having a low index of free swelling, mixed with fine coal and the mixture aglomerados at high temperature, resulting in low-quality coal is available for useful applications.

In achieving the above objectives, the method proizvodnje, characterized by the fact that the fine coal having an index of free swelling of 3.0 or more and a particle size of 8 mm or less support at 600oC or higher for 5 minutes or more, resulting in out of the coal agglomerates, which are used in the furnace direct smelting reduction plants.

In accordance with another aspect of the present invention a method of manufacturing coal agglomerates, which are used in the furnace direct smelting reduction plants, characterized by the fact that the fine coal having an index of free swelling of 3.0 or more and a particle size of 8 mm or less, mixed with 70 wt.% anthracite or slightly svobodnenskoye coal and maintain at a temperature of 600oC or higher for 5 minutes or more, in consequence of which receive coal agglomerates used in the furnace direct smelting reduction plants.

The above objectives and other advantages of the present invention will become better understood through a more detailed description of the preferred variant of the present invention, which will be made reference to the accompanying drawings, on which:

Fig. 1 is a graphical illustration showing the change of the limit proc drawing showing the change of tensile strength in compression during the agglomeration of fine coal, depending on temperature;

Fig. 3 is a graphical illustration showing the change of tensile-compression depending on the ratio in the mixture of anthracite and fine coal.

The coal, which, preferably, is used in the agglomeration of fine coal in accordance with the present invention, is a conventional coal having a particle size of 8 mm or less and an index of free swelling of 3.0 or more.

Videopreteen conventional coal obtained from the direct process smelting reduction plants.

If the coal agglomerates used in the furnace direct smelting reduction plants receive in accordance with the present invention, finely-divided coal must be maintained at 600oC for 5 min or more. The reason for this is the following. If the temperature to maintain the temperature of sintering is less than 600oC, coal agglomerates are easily destroyed and the desired tensile strength in compression in the furnace direct smelting reduction plants cannot be obtained.

The higher the temperature sintering, the great C.

So, if you want to get a high tensile strength in compression, it is preferable to apply the temperature sintering 650-800oC.

In addition, during the agglomeration of fine coal while maintaining time (agglomeration) should be 5 minutes or more, and the reason for this is the following. If the agglomeration is less than 5 min, the limit of compressive strength will decrease.

Incidentally, the coal agglomerates can also be obtained in this way, in which finely-divided coal is mixed with slightly svobodnenskoye coal, which may be slightly stick, or anthracite, which does not stick together, and the mixture is then supported at 600oC or higher for 5 minutes or more.

Share slightly svobodnenskoye coal or anthracite coal in the mixture must be 70 wt.%, and the reason for this is the following. If this share will be more than 70% of ultimate strength in compression, which would have been suitable for furnace direct smelting reduction plants, it is impossible to get.

Thus, with the agglomeration of fine coal in accordance with the present invention receive coal agglomerates having a particle size of 8 mm Il is logispring coal through agglomeration. In the present invention, the waste heat generated from the furnace direct smelting reduction plants, used as a heat source. Fine coal receive, preferably, from direct process smelting reduction plants and derived coal algomarine use in a furnace direct smelting reduction plants.

Typically, the reducing gas is generated from the furnace smelting reduction plants, has a temperature of about 1100oC. the Optimum temperature, which is necessary in the upper part of the shaft furnace is about 850oC. Therefore, before entering into the shaft furnace is about 20% reducing gas having a temperature of 850oC, is cooled during its passage through the scrubbers with the Venturi tubes to approximately the 50oC. This recycled cooled gas flows into the generator gas line and it can be used as a means of controlling the temperature of the reducing gas.

Equipment for sintering high temperature micro dispersed coal set before the scrubbers with the Venturi tubes. Thus, the fine coal in accordance with the present invention will aglomerated using waste heat polnye agglomerates, which are the above-described method, can be placed in the upper part of the furnace direct iron ore smelting reduction plants.

Thus, the coal agglomerates used in the furnace direct smelting reduction plants, obtained using waste heat generated in the heat source in the oven direct smelting reduction plants and using fine coal obtained from the furnace direct iron ore smelting reduction plants. In this case, receive the following benefits:

Fine coal with a particle size less than 8 mm, obtained from the furnace direct smelting reduction plants, can be used in useful applications. Fine coal can be glomerulopathy by mixing with slightly svobodnenskoye coal or anthracite. In addition, for useful applications can be used not only waste heat recovery gas, but also coal agglomerates which are heated to a high temperature (about 600oC or higher), can be directly placed in the upper part of the furnace direct iron ore smelting reduction plants. Therefore, the heat, the resulting rise in temperature, which ever the present invention will be illustrated by real examples.

Example 1. Two varieties of fine coal [Coal C. B. W. (C. B. C.) (South black water) and coal M Tons (MT) (Mountain thorey)], which are received from the process of direct iron ore smelting reduction plants and which had an index of free swelling of 4.5 and a particle size of 8 mm, was placed in crucibles. Then the crucible was placed in an electric furnace and heated to a temperature of 850oC. then every 5 min for 30 min was measured strength in compression. The measurement results shown in Fig. 1. As follows from Fig. 1, if the agglomeration is more than 5 min, can be obtained sufficient tensile strength in compression. Was received limit of the compressive strength of more than 5 kg/cm2that is the minimum tensile strength in compression, suitable in the process of direct iron ore smelting reduction plants.

Example 2. MT coal of example 1 was used during sintering, is 10 minutes, while the temperature of agglomeration (the reaction temperature) was varied from 600 to 850oC 50oC took place due to which agglomeration of the coal. After raising the temperature at every 50oC was measured tensile strength in compression, the measurement results shown in Fig. 2. As follows from Fig. 2, when the temperature of aglamak.T. the coal of example 1 was heated so that the established temperature sintering 850oC and time of sintering was set to 10 minutes in Addition, with fine coal mixed anthracite, the number of which is increased each time by mixing 10%, from 20% to 70% of anthracite, in this way made the agglomeration of the coal mixture. The limit of compressive strength was measured for each 10% increase in the number of anthracite, the measurement results shown in Fig. 3.

As follows from Fig. 3, when the amount of anthracite in the mixture increased, the limit of the compressive strength was decreased, but when the content of anthracite in the mixture equal to 70% of ultimate strength in compression was sufficient to coal agglomerates could be applied in the recovery process of smelting iron ore.

In accordance with the present invention described above, fine coal, which is obtained from the process of direct iron ore smelting reduction plants, can be agglomerated in a simple way. In addition, with fine coal can be mixed anthracite, which does not stick together, or slightly svobodnenskoye coal, and therefore can be advantageously used energy. In particular, stravitelne melting, aglomerados in accordance with the present invention, can be used anthracite or slightly svobodnenskoye coal having a low index of free swelling, as a consequence, it becomes possible to use even a very low-quality coals. In addition, the coal, which is heated to a high temperature, is placed in the upper part of the furnace direct iron ore smelting reduction plants, and therefore the profiled section of the arch of the furnace is heated by natural means, which leads to energy savings.

1. Method of manufacturing coal agglomerates used in the furnace direct iron ore smelting reduction plants, including the use of fine coal, wherein the fine coal has an index of free swelling is 3 or more, and the particle size is 8 mm or less, and fine coal aglomerados by heating it to a temperature of 600oC or higher for 5 minutes or more.

2. The method according to p. 1, characterized in that the fine coal aglomerados at 650 - 850oC.

3. The method according to any of paragraphs.1 and 2, characterized in that the fine coal is obtained from the direct process smelting reduction plants as enoy the smelting of iron ore, involving the use of fine coal, wherein the fine coal has an index of free swelling is 3 or more, and the particle size is 8 mm or less, and finely-divided coal is mixed with slightly svobodnenskoye coal or anthracite in the amount of 70 wt.% or less, and a mixture of fine coal aglomerados by heating it to a temperature of 600oC or higher for 5 minutes or more.

5. The method according to p. 4, characterized in that the fine coal aglomerados at 650 - 850oC.

6. The method according to any of paragraphs.4 and 5, characterized in that the fine coal is obtained from the process of direct iron ore smelting reduction plants.

 

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