JPS5930194B2 - Molded coal manufacturing method - Google Patents

Description

[Detailed description of the invention] The present invention relates to a method for producing briquette coal.

In recent years, as the raw material coal situation has worsened, recessive coal such as slightly caking coal and non-caking coal has become more available than before. What is currently known is that the raw material lime is mixed with bituminous material as a binder, mixed with waves, and molded under pressure in a molding machine to form molded coal.This is then mixed with ordinary blended coal to make coke. The so-called briquette coal partial blending method, which involves dry distillation in a furnace, is well-known.

On the other hand, various studies have been conducted on methods for producing compact coke in the form of charcoal by continuously dry distilling the above-mentioned pressurized briquette coal in a shaft furnace or the like that is different from a normal coke oven.

In any case, in order to produce high-quality coke that has the strength to withstand metallurgical use, it is essential to first produce high-quality briquette coal in which coal particles are tightly packed.

By the way, when producing this briquette coal, it is common to add an appropriate amount of a binder to the raw coal that has been pulverized as described above to make the coal particles stick together, mix and knead it, and then press-mold it. However, in order to produce high-quality briquette coal, an important consideration is what kind of caking agent (hereinafter referred to as binder) to choose.

Most of the commonly used binders are bituminous materials that are solid at room temperature, such as pitch and asphalt.

In order to uniformly add the above-mentioned binder, which is solid at room temperature, to raw coal, it must be heated to a melting temperature and then liquefied or crushed into powder before being added. The disadvantage is that you have to throw it away.

Also, as disclosed in Patent No. 174084,
It is described that an aqueous emulsion of tar and water or a mixture of bentonite or acid clay is used as a binder for molded coal, but the aqueous emulsion of tar and water is an anionic binder. Anionic emulsions are compatible with the polarity of coal (coal is also anionically charged), and although some water is squeezed out during molding, most of the water remains, resulting in poor thermal efficiency (and poor pressure resistance). The drawbacks are that only briquettes with weak strength can be obtained and that the stability of the emulsion is extremely short (about 1 hour).

Furthermore, those containing bentonite or acid clay have the disadvantage that they form ash after dry distillation when combustion is performed.

The present invention solves the difficulties encountered in producing briquette coal using the conventionally known binder as described above.
The invention was developed after various studies, and the purpose of the present invention is to eliminate the need for troublesome operations such as heating or pulverizing when blending with raw coal, and to improve kneadability and permeability with coal. The purpose is to provide a manufacturing method that can produce molded coal with low moisture content and high pressure resistance, molded with a binder that is a good cationic emulsion. This method of producing molded coal is characterized by adding an emulsion containing a bituminous material acylated with a fatty acid and an aqueous amine salt solution as a binder and molding the coal.

Hereinafter, to explain the present invention in more detail, in the binder used for producing the briquette coal of the present invention, one of the components of the binder is
Bituminous materials acylated with higher unsaturated fatty acids include, for example, straight asphalt obtained from petroleum, blown asphalt, propane tax source asphalt,
Coal tar pitch obtained by dry distillation of coal and oil that is a by-product during medium-temperature lubricant oil extraction in the petroleum refining process and is generally called aromatic oil or process oil, which has an aromatic oil content of 60% or more and an aniline point of 20.
℃ or less, higher unsaturated fatty acids having around 18 carbon atoms, specifically stearic acid, oleic acid, etc., or a mixture of two or more of these (specific examples include castor oil fatty acid, tung oil) fatty acids or a mixture of two or more of soybean oil fatty acids) to introduce acyl groups into molecules of the chemical composition of the bitumen through intermediate formation of ether groups, ester groups, carboxyl groups, carbonyl groups, etc. It is in the form of

Such acylated bituminous material is prepared by heating the bituminous material and heating it and the higher unsaturated fatty acid at a temperature of, for example, 150 to 160°.
It is obtained by reacting G for several hours under heating.

In this case, if sodium perchlorate is used as a catalyst, the reaction will proceed quickly.

Therefore, the purpose of acylating the bituminous material in the present invention is to make the aqueous emulsion cationic to improve its fluidity and adhesion, as well as to minimize the moisture content of the briquette coal, and to improve the kneading properties of the binder. The purpose of this invention is to provide a binder that can produce molded coal with good permeability and high pressure resistance.

Further, the amine salt aqueous solution, which is another component of the binder to be added to the raw coal in carrying out the method of the present invention, is for assisting the aqueous emulsification of the acylated bitumen, and is an organic or An aqueous solution of amine salt is obtained by adding an aliphatic or aromatic monoamine or polyamine to an aqueous solution of an inorganic acid, and an alkyltrimethyldiamine, specifically stearyltrimethyldiamine or oleyltrimethyl, is added to an aqueous solution of acetic acid or hydrochloric acid. An aqueous solution containing about 3 to 10% by weight of a diamine salt obtained by adding a diamine such as diamine and stirring while heating gives good results.

Incidentally, the caking property can be further increased by adding an appropriate amount of animal or vegetable glue to the bituminous material acylated with higher unsaturated fatty acids or to the aqueous amine salt solution.

Next, in carrying out the method of the present invention, the binder to be added to the raw coal is 20 to 60 parts by weight of the bituminous material acylated with the higher unsaturated fatty acid and the organic acid or inorganic acid of the amine. and 80 to 40 parts by weight of an aqueous salt solution in a commonly known emulsifying device such as a homogenizer or a colloid mill.

In this case, it is preferable to use a deliquescent substance such as calcium chloride or magnesium chloride as an emulsion stabilizer, since the emulsion stability period can be extended to about 3 times, that is, about 3 months, compared to when no such substance is used.

In addition, in order to carry out the present invention, the emulsion liquid binder may be used as is or, if necessary, diluted with water to a desired concentration, and in some cases, other known auxiliaries may be added to the raw material coal. In the middle of the transfer equipment or in the mixed coal, it may be dispersed and permeated into the raw coal, kneaded in a kneader, and then pressure-molded in a known molding machine.

In the present invention, bituminous materials such as various asphalts obtained from petroleum and coal tar pitch obtained from coal that are acylated with higher unsaturated fatty acids are in a colloidal state suspended in an aqueous amine salt solution at room temperature. Because of this, it is extremely easy to store, transport, etc., and when mixing coking coal and binder during the production of briquette coal, it is possible to mix the coking coal and binder at room temperature, and the coking coal and binder must be heated in advance. It is not necessary (it is very advantageous in terms of operation).

Furthermore, since the binder used in the method of the present invention is in the form of small colloidal particles in an aqueous solution, it can be uniformly dispersed in the raw coal at the time of addition, and the binder can be used efficiently. When using solid coal tar pitch, which is used as a coal tar pitch, or asphalt, which is not compatible with coal,
% by weight of binder is required, the amount of binder can be reduced to 3.6 to 6.0% by weight of coal as the amount of binder components excluding water, which is extremely advantageous from the viewpoint of raw material cost. .

Furthermore, in the kneading step, which is one of the steps for producing briquette coal by the method of the present invention, the binder is cationic and easily compatible with raw coal, so the blended mixture of raw coal and binder can be mixed without heating. It is also possible to transfer to the pressure molding process which is the primary process.

In the next step, the pressure molding step, most of the moisture contained in the blended and kneaded material is removed and the residual moisture is very small, and the residual moisture does not harm the quality of the briquette coal. Compared to the conventional aqueous emulsion binder made by adding water to non-acylated bituminous material (Chur), it is possible to produce molded coal with less residual moisture, better thermal efficiency, and greater strength. .

Next, examples of the manufacturing method of the present invention will be described.

Example 3 5 parts by weight of amarotic oil heated to 145°C and 60 parts by weight of straight asphalt heated to 170°C were mixed and stirred, and soybean oil fatty acid 5 was heated to 70°C.
Parts by weight were added and mixed, 0.1% by weight of sodium perchlorate was added to the total weight, stirred while maintaining the state at 180°C for 1 hour, and after the intense foaming subsided and aged for 1 hour, the present invention An acylated bituminous material (hereinafter referred to as base agent A), which is one component of a binder used in the following, was obtained.

Separately, 1 part by weight of acetic acid, 2 parts by weight of stearyltrimethyldiamine, which is a type of amine, and 0.5 parts by weight of magnesium chloride were added in the above order to 96.5 parts by weight of water heated to 50°C. The mixture was added, mixed and stirred to obtain an aqueous diamine salt solution (hereinafter referred to as base agent B), which is another binder used in the present invention.

Next, 60 parts by weight of the base agent (A) and 40 parts by weight of the base agent (B) were sufficiently mixed and stirred using a homogenizer to obtain an emulsion-like binder used in the present invention.

Next, the binder was mixed with a moisture content of 9% and a particle size of 3 mm or less at 80%.
To the sample coal adjusted to Molded coal was produced.

However, when the strength of the briquette coal was measured over time, the results shown in Table 3 were obtained.

As a comparative example, Table (3) also shows the results of producing molded coal by kneading an emulsion of tar and water as a binder into raw coal, kneading it, and then pressurizing it.

As is clear from the above results, the molten coal obtained by the method of the present invention has higher strength and has higher residual moisture content than molten coal using a known emulsion of tar and water as a binder. This makes it possible to obtain briquette coal with low thermal efficiency.

Furthermore, as is clear from the results in Table 2, in the method of the present invention, the amount of binder components excluding water is smaller than in the case of using a binder consisting of tar and water, which is extremely advantageous in terms of raw material cost. It can be said to be a method.

In addition, when obtaining briquette coal using a binder that is solid at room temperature, such as conventional propane asphalt, heating of the binder is required, insulation of binder transport piping, pre-warming of coking coal, and mixing machine. This eliminates the need for heating, steam injection in a kneader, etc., which is extremely advantageous in terms of construction and operation of a briquette plant.

Since the method of the present invention is configured as described above, it is clear from the above explanation that kneading can be performed at room temperature and binder permeability is higher than when using straight asphalt, propane asphalt, or coal tar pitch. This has the effect of providing good quality and uniform kneading.

In addition, compared to those using an emulsion-like binder made of tar and water, the amount of binder used is small,
While being economical, it is possible to obtain briquette charcoal with low residual water content, good thermal efficiency, and high pressure resistance.

Moreover, since the emulsification stability period of the binder is long, about one month, it has a remarkable effect that there is no restriction on the period of use.

Claims (1)

[Claims] 1. A method for producing molded coal, which comprises adding and molding an emulsion of a bituminous material acylated with a higher unsaturated fatty acid and an aqueous amine salt solution as a binder to raw coal. 2 Straight asphalt and/or aromatic oil whose binder is acylated with a higher unsaturated fatty acid selected from castor oil fatty acid, tung oil fatty acid and soybean oil fatty acid, and an acetate of a diamine selected from stearyltrimethyldiamine and oleyltrimethyldiamine. The method for producing briquette charcoal according to claim 1, which is an emulsion containing an aqueous hydrochloride solution or an aqueous hydrochloride solution.