KR101869330B1 - Method for modifying slurry of coal and/or iron ore - Google Patents

Abstract

It is another object of the present invention to provide a method for modifying a slurry of coal and / or iron ore to reduce the fluidity of sediments more easily and a method for producing the improved raw material. In order to solve the above problems, a water-soluble polymer compound is added to and mixed with coal and / or iron ore slurry to modify coal and / or iron ore slurry. Then, the modified raw material was prepared by the modification. The water-soluble polymer compound is preferably an anionic W / O type emulsion polymer.

Description

METHOD FOR MODIFYING SLURRY OF COAL AND OR OR IRON ORE.

The present technology relates to a method for modifying coal (coal) and / or iron ore slurry (reforming method) and a method for producing the modified raw material.

Coal and / or iron ore (hereinafter also referred to as " iron ore or the like ") is mined in a mine and is transported by conveying means (conveying means) such as a belt conveyor, a freight car, Stored in storage or processing facilities, stored, or processed. Thereafter, iron ore or the like is returned to a facility using iron ore or the like (for example, a steel mill, a heat source for power generation or industrial use, a factory, etc.) by conveying means such as a belt conveyor.

In such a mining site, a conveying means, a processing facility, a use facility, etc., when rainfall occurs in iron ore or the like; When sprinkling or watering iron ore when storing or cleaning; Coal and / or iron ore is immersed in water. Therefore, iron ore, etc., often come into contact with water at mining sites, processing facilities, and use facilities (especially steelworks).

In this way, water and / or iron ores are brought into contact with water to produce water and slurries of coal and / or iron ores are generated. It is necessary to reuse this slurry as a raw material or dispose of it as waste.

However, these slurries are difficult to perform various operations or treatments due to their high fluidity. For example, even if it is tried to store and store it outdoors, since it has high fluidity, it is difficult to carry it high and it is not easy to carry it.

For this reason, a reforming method for reusing or disposing slurry of coal or iron ore has been proposed. For example, a method of forming a pit with concrete or soil or the like and dewatering the slurry of coal or iron ore by drying it in the sun (sun drying); A method of dewatering using a dewatering device of a filter press; Liquid separation (solid-liquid separation) in which a pit is formed into a specific porous body and a slurry of coal or iron ore is put in the slurry to adsorb the fine powder material or the like in the slurry to the porous material, (Patent Document 1) are known.

However, in order to form pits, a large space for forming the pits or pit construction work is required in advance, and further, a long time is required for solidification drying in the pits. In addition, in order to use the dehydrator, it is necessary to invest the equipment and install the equipment in advance and return it to the specific installation site.

Therefore, there is a demand for a method that can more easily modify coal, iron ore and slurry thereof.

Japanese Patent Application Laid-Open No. 8-196820

In view of the above problems and circumstances, the present technology provides a simpler method of modifying coal and / or iron ore, a slurry thereof, and a method for producing a modified raw material.

As a result of intensive studies, the inventors of the present invention have found that when a water-soluble polymer compound is added to and mixed with a coal and / or iron ore slurry which is difficult to handle due to the slurry condition and which is difficult to easily modify, the fluidity of the slurry can be easily lowered, It was easy to handle stably.

Therefore, the present technology relates to the following [1] to [7].

[1] A method for modifying a coal and / or iron ore slurry, wherein a water-soluble polymer compound is added to a coal and / or iron ore slurry and mixed.

[2] The modifying method according to the above-mentioned [1], wherein the water-soluble polymer compound is an anionic W / O type emulsion polymer.

[3] The modifying method according to [1] or [2], wherein the water-soluble polymer compound is added and mixed and then an inorganic metal salt is further added.

[4] The method according to [3], wherein the inorganic metal salt is an aluminum salt.

[5] A method for producing a modified raw material, wherein a water-soluble polymer compound is added to a coal and / or iron ore slurry and mixed.

[6] The production process according to the above [5], wherein the water-soluble polymer compound is added and mixed and then an inorganic metal salt is further added.

[7] A coal and / or iron ore slurry modifier containing a water-soluble polymer.

According to this technology, coal and / or iron ore slurries generated from coal and / or iron ore or coal and / or iron ore slurries generated from steelworks can be more easily modified into easily handled sediments. This makes it possible to obtain a raw material containing coal and / or iron ore which is easy to handle.

1 shows the test results of the flowability improvement of the iron ore slurry when the addition of the water-soluble polymeric compound (A) and the inorganic metal salt (B) 5: 5 kg / m ³ ) or no addition (0: 0 kg / m ³ ).
2 shows the results of the fluidity improvement test of the coal slurry: when the water-soluble polymer compound (A) is added and stirred (1, 2, or ³ kg / m ³ ) or when no addition is performed (0 kg / m ³ ) .
Fig. 3 is a graph showing the results of the drying promotion test of the coal slurry for the case of stirring (5: 5 kg / m < ³ >) or stirring without addition of the water-soluble polymer compound (A) and the inorganic metal salt (B) m ³ ).

The present technology is to add and mix a water-soluble polymer compound to coal and / or iron ore and slurry thereof. At this time, it is preferable that the water-soluble polymer compound is added and mixed, and then an inorganic metal salt is further added and mixed.

The coal and / or iron ore slurry to be treated is a slurry containing at least coal and / or iron ore. Further, it may further include those used as raw materials for iron making such as coke and slag.

As the coal and / or iron ore slurry, as described above, a field yard of a mine; Processing facilities such as crushing (crushing); Storage facilities such as wild animals; A conveying means such as a belt conveyor, a ship, a wagon or the like; And iron ores and the like which are generated by containing water in use facilities such as steel mills and the like.

For example, raw materials such as coal, iron ore, coke, slag, etc. are discharged and deposited on a drainage port by rainfall on the raw yard of an outdoor yard or spraying for the purpose of preventing dusts; A pit storing water for cleaning a belt conveyor for conveying a raw material, or a sedimentation pond (pond) for causing raw materials flowing from a production line to flow by rainwater or the like; Sediments recovered from wet dust collecting plants or deposits in yards; Water containing water that is sprinkled on the outside yard for the purpose of preventing dust when it is transported by a belt conveyor; Dry dust collecting (slurrying) by flowing water to the recovered material from the plant; Water-containing materials intended for the purpose of administrative storage in transportation means, treatment facilities, storage facilities, etc.; Wet by immersing water for storage on board; And a means of cleaning and recovering the conveying means and the like with water.

A raw material such as fine coal or iron ore is liable to become a slurry. The size of the raw material is, for example, a particle diameter (maximum diameter) of 5 mm or less.

The coal and / or iron ore slurry to be treated by the present technology has almost no water retaining property because it contains charcoal and iron components. Therefore, the coal and / ) And muddy soil, it is considered that handling is difficult. However, it has become possible to facilitate the handling by modifying by the present technique.

The water content of the coal and / or iron ore slurry is not particularly limited, but is preferably 10% by mass or more, more preferably 15 to 80% by mass, and more preferably 20 to 70% by mass desirable. This water content can be measured according to JIS A 1125.

Examples of the water-soluble polymer compound to be used in the present invention include synthetic water-soluble polymer compounds, semi-synthetic water-soluble polymer compounds, and natural water-soluble polymer compounds. The following may be used alone or in combination of two or more.

Examples of the synthetic water-soluble polymer compound include polyvinyl alcohol, polyvinyl pyrrolidone, poly (meth) acrylamide, poly (meth) acrylic acid or salts thereof, polyethylene oxide, polyvinyl methyl ether; (Meth) acrylic acid, (meth) acrylamide, maleic anhydride, maleic acid, maleic acid amide, maleic acid imide, itaconic acid, crotonic acid, fumaric acid and the like or salts thereof. Examples of the salt include alkali metal salts such as sodium and potassium.

Examples of the semisynthetic water-soluble polymer include cellulose derivatives such as viscose, methylcellulose, cationized cellulose, ethylcellulose, carboxymethylcellulose, and hydroxypropylcellulose; Starch derivatives such as alpha starch, carboxyl starch, dialdehyde starches, cationized starch, dextrin and British gum (dextrin); Cationized guar gum, anionic guar gum, methyl glycol chitosan, and the like.

Examples of the natural water-soluble polymer include starch, mannan, guar gum, xanthan gum, sodium alginate, locust bean gum, pectin, dextran, gelatine, Rhamsan gum, gellan gum, and the like.

The water-soluble polymer compound may be anionic, cationic, nonionic or amphoteric. Of these, anionic and nonionic ones having low toxicity to fish are preferred, and anionic ones are more preferable.

Among these water-soluble polymer compounds, synthetic water-soluble polymer compounds are preferable.

The synthetic water-soluble polymer compound is preferably a homopolymer or copolymer comprising one or more of anionic monomers and nonionic monomers as constituent components.

Examples of the anionic group (anionic monomer) include carboxylic acid (monomer) such as acrylic acid, methacrylic acid, maleic acid, fumaric acid and itaconic acid; And sulfonic acids (monomers) such as styrenesulfonic acid, vinylsulfonic acid and 3-aryloxy-2-hydroxypropanesulfonic acid.

Examples of the nonionic group (nonionic monomer) include acrylamide (monomer) and methacrylamide (monomer).

Among the above-mentioned synthetic water-soluble polymer compounds, acrylate-based and / or acrylamide-based polymers are preferable.

Examples of the acrylic acid-based and / or acrylamide-based polymer include acrylic acid alone polymer, acrylamide single polymer, acrylic acid / acrylamide copolymer, partial hydrolyzate of polyacrylamide, acrylic acid / acrylamide / -Methylpropanesulfonic acid copolymer, and acrylic acid / maleic acid copolymer. These may be used alone or in combination of two or more. Of these, acrylic acid / acrylamide copolymers, acrylamide alone polymers, and partially hydrolyzed polyacrylamides are preferred because of their high molecular weight.

The average molecular weight of the acrylamide-based or acrylic acid-based polymer is preferably 1,000,000 to 10,000,000, more preferably 5,000,000 to 9,000,000 (intrinsic viscosity method).

In the case of the anionic polymer, the content of the acrylic acid unit at the time of producing the acrylic acid-based and / or acrylamide-based polymer is preferably at least 5 mol%, more preferably at least 5 mol%, based on the total amount (100 mol% , And more preferably 20 to 100 mol%.

The state when the water-soluble polymer compound is used is not particularly limited, and it is suitable to use it as a powder state, a liquid state, or an emulsion state. It is particularly suitable to be used in the form of a powder and an emulsion which can be used without increasing the moisture of the object to be treated. Also, it is suitable to use as an emulsion phase (preferably, on a W / O type emulsion phase) in which the effect of modifying the slurry and increasing the fluidity can be reduced in the occurrence of self-antinomy. The water-soluble polymer compound on the W / O type emulsion can be produced by a known method (for example, Japanese Examined Patent Publication No. 52-039417, Japanese Patent Application Laid-Open No. 51-41090).

The amount of the water-soluble polymer compound to be used is usually 0.1 to 15 kg, preferably 1 to 10 kg, in terms of dry matter, per 1 m ³ of the coal and / or iron ore slurry. The use amount within this range makes it possible to granulate the coal and / or the iron ore slurry in an excessively small amount, and is economically advantageous.

The water-soluble polymer compound preferably has a pH of 6 to 8 when it is an aqueous solution (at 25 degrees C: 0.1 to 0.3 mass% of the water-soluble polymer compound).

The water-soluble polymer compound may be properly added and mixed. As an example, the water-soluble polymer compound may be added to the slurry and then mixed per m ^{3 of the} ordinary slurry for 0.5 to 60 minutes. When the coal and / or iron ore slurry contains oil, it is preferable to add the water-soluble polymer compound and leave the mixture for 5 to 60 minutes before mixing to improve work efficiency.

The water-soluble polymer compound is dispersed in the slurry by adding the water in the slurry to the water-soluble polymer compound by mixing (stirring). Therefore, the water-soluble polymer compound bridges (crosslinks) with each particle of coal or iron ore to further restrict moisture. This makes it possible to obtain a processed material (reformed raw material), i.e., a reformed material, having reduced fluidity.

The stirrer or kneader to be used in the mixing is not particularly limited, and conventionally known ones such as a backhoe, an excavator, a stabilizer, and a biaxial mixer may be used.

At this time, the treatment temperature is not particularly limited, but it is preferable that the treatment temperature is about room temperature (5 to 35 degrees) from the viewpoint of reactivity.

In addition, it is preferable to add and mix the inorganic metal salt after adding and mixing the water-soluble polymer compound to obtain a modified sediment having no more tenacity, that is, ) Can be obtained.

The inorganic metal salt is not particularly limited, and examples thereof include monovalent metal salts, bivalent metal salts, and trivalent metal salts. It can also be classified into, for example, metal chlorides, metal sulfates and the like.

Examples of the monovalent metal include alkali metals such as sodium and potassium. Examples of the divalent metals include alkaline earth metals such as calcium, barium and magnesium, and divalent metals. Examples of the trivalent metal include trivalent metals such as aluminum and trivalent iron.

Of these, at least one selected from divalent metal salts and trivalent metal salts (excluding basic oxides) is preferable.

Examples of the divalent metal salt include divalent metal chlorides and divalent metal sulfates such as calcium chloride, calcium sulfate, barium chloride, magnesium chloride, magnesium sulfate, and ferrous chloride.

Examples of the trivalent metal salt include trivalent metal chlorides such as aluminum polychloride (PAC), aluminum sulfate (barium sulfate), ferric chloride and ferric sulfate, and trivalent metal sulfates. Of these, aluminum salts are preferable, and PAC and sulfuric acid bands are particularly preferable. As a result, the fluidity of the treated product is further reduced, and it is possible to obtain a modified product having less influence on the surroundings even when exposed to rainfall from the outside.

These may be used alone or in combination of two or more.

The state when the inorganic metal salt is used is not particularly limited, and it is preferable to use it in a powder state or a liquid state.

The amount of the inorganic metal salt to be used is suitably in the range of 0.1 to 15 kg, preferably 1 to 10 kg, in terms of dry matter, relative to 1 m ³ of the coal and / or iron ore slurry.

The addition of the inorganic metal salt is usually carried out for about 1 to 60 minutes, preferably about 1 to 30 minutes after the inorganic metal salt is added to the slurry containing the water-soluble polymer compound. This mixing (stirring) promotes the self-supporting property of the granulated product, which makes it possible to obtain more stable sediments with reduced fluidity, that is, better-modified sediments.

The stirrer and the kneader to be used at this time may be those conventionally known in the same manner as described above.

At this time, the treatment temperature is not particularly limited, but it is preferable that the treatment temperature is about room temperature (5 to 35 degrees) from the viewpoint of reactivity.

It is preferable to cure the coal and / or iron ore slurry after the water-soluble polymer compound, the water-soluble polymer compound and the inorganic metal compound are added and mixed for a certain period of time since the drying is promoted and the weight is reduced. The curing period is preferably 10 to 150 hours, more preferably 48 to 120 hours, from the viewpoint of work efficiency.

In this state, stable granulation can be carried out, whereby the slurry can be reformed and the fluidity of the coal and / or iron ore slurry can be lowered. The moisture content of the obtained modified product after drying and curing is preferably 10 to 40% by mass, more preferably 15 to 30% by mass, in order to reduce the fluidity and to reduce the weight.

A modification mechanism of the present technology will be described.

When the water soluble polymer (preferably in the emulsion state) of the present technology is added to the coal and / or iron ore and the slurry thereof (after being appropriately added in the case of slurry containing oil) and then mixed and stirred, The water soluble polymer material is dispersed in the coal and / or iron ore and the slurry in the presence of water, the coal and / or iron ores and the water contained in the slurry.

The object such as the coal and / or iron ore slurry contains a high concentration of coal or iron ore, but then the water-soluble polymer compound and the coal and / or iron ore are crosslinked and can be granulated in the presence of water. By agglomeration, moisture is confined in these particles and the fluidity of the slurry is suppressed. In addition, the modification of the symptoms is caused by the improvement of the plastic flowability of the slurry. In the coal and / or iron ores before the slurry is formed, it is possible to modify them by using the water-soluble polymer (preferably in an emulsion state) of the present technology in the presence of water. Therefore, it is easy to handle the modified iron ores and the like since slurry formation is suppressed even after they are brought into contact with water.

Further, in addition to the water-soluble polymer compound of the present invention, the inorganic metal salt may be added and stirred to promote the self-sufficiency of the granule. This results in a more stable assembly.

The slurry of coal or iron ore having high fluidity can be rapidly reformed to be in a state capable of mass transfer. Further, even if the reformate is exposed to rainfall or the like, the slurry is not re-slurred, and the collapse of the accumulated pile can be prevented. In addition, the reformed product has a self-supporting property that is easy to carry by dumping or the like, and can be of a size (for example, about 10 mm in diameter) that can be easily taken out by a belt conveyor or the like.

Here, since the coal and / or iron ore slurry has high fluidity, is heavy, and has a poor water dripping, it takes time to unload and can not be stacked outdoors, and a long time is required for drying.

For example, conventionally, a slurry containing a raw material of a steel such as coal or iron ore is dried by sun-drying to lower the fluidity and then stacked up. However, since it is used outdoors, it is easily influenced by the weather and a long period of time is required for drying . In addition, there is a possibility that the particles on the surface of the pile piled up by rainfall may leak out by rainfall or the piled up piles containing the above-mentioned seasonal raw materials may fall down.

Also, a method of solidifying the surface of the dummy by spraying a W / W type ethylene-vinyl acetate-vinyl acetate resin emulsion on the surface of a sediment containing a seasonal raw material (surface) is also employed. However, if it is not dried to some extent before it is buried in coal or iron ore, it can not be stacked highly, and it takes time to dry. In addition, since the spraying of the resin emulsion takes several days to harden, if there is rainfall between the resin emulsions, the chemical agent flows out together with the rainwater, and the effect can not be exhibited.

A method of adding quicklime is also employed. Calcium oxide (quicklime) is added to the slurry to evaporate moisture in the reaction heat generated by moisture in coal or iron ore and hydration reaction with calcium oxide, and the slurry is cured by hydration reaction . By doing so, it is possible to obtain a modified moisture state and a state suitable for integration or transportation. However, since a large amount of quicklime is added, the amount of treated water is increased, so that a large treatment site and storage place are required, and the amount of transportation increases. In addition, since a high alkaline powder is used in large quantities, there is a possibility of exposure of the operator to alkalis when handling this, and there is a possibility of dust scattering of the highly alkaline deposit.

On the other hand, according to the method of the present invention, the material (the water-soluble polymer compound or the inorganic metal compound) which has little or no influence on the reuse of steel or the like even when cement or lime is not added to the coal, (Raw material for reuse) in which the fluidity is reduced and can be reused. That is, coal and / or iron ore and slurry thereof can be produced as a raw material (raw material for reclaiming) by using the polymer compound. In addition, since this material has little influence on the human body, there is no problem such as alkali exposure during stirring and mixing, and work efficiency and safety are also improved.

In addition, the coal, the steel stone, and the slurry (sediment) are assembled to promote water dropping, and thus become more easily dried. In drying, the water content of the reformate is lowered and lighter, so that the reformate can be maintained in a stable granular state, so that it can be easily transported and can be highly charged.

As described above, the water-soluble polymer compound of the present invention can be obtained by modifying a raw material of coal and / or iron ore by adding and mixing the object in the presence of water; It is possible to modify the coal and / or iron ore slurry. Further, raw materials for modified coal and / or iron ores can be produced by using the water-soluble polymer compound of the present invention.

The water-soluble polymer compound of the present invention may be used as a modifier of coal and / or iron ore raw material; (Hereinafter also referred to as " modifier ") such as a modifier for the slurry. The modifier may optionally contain optional components such as an inorganic metal salt, an emulsifier, and a surfactant. These optional components can be used as an auxiliary agent for the modifier, and may be used simultaneously or separately with the modifier. These agents may be in any state such as liquid, solid or powder.

Examples of the object of the present invention include coal and / or iron ore (hereinafter also referred to as " iron ore "), iron ores containing water, and slurries such as iron ore. good.

In the method for modifying the raw material of coal and / or iron ore of the present invention and the method for modifying the slurry, the water-soluble polymer (or inorganic metal salt) may be used as it is or as an aqueous solution. The above water-soluble polymer compound (also, inorganic metal salt) may be used as a modifier for the object. For example, the modifier of the present invention can be obtained by adding a modifier to coal and / or iron ore or slurry thereof and mixing the same to obtain better properties (water drop, lightness, granular shape, etc.). As an example of the treatment method, iron ore or the like may be treated with a modifier or the like of the present invention in an aqueous solution state, or iron ore containing water or the like may be treated with a modifier of the present invention in powder form.

The "water-soluble polymer compound of the present invention, its aqueous solution, and the modifier containing the water-soluble polymer compound of the present invention" are also referred to as "modifiers and the like of the present technology".

Accordingly, the present technology relates to a method for modifying coal and / or iron ore by adding and mixing modifiers and the like of the present invention to coal and / or iron ores in the presence of water; It is also possible to provide a method for producing a modified raw material.

This modification method; The respective conditions of the method for producing the modified raw material are the same as the above-mentioned coal and / or iron ore slurry modification method; It may be the same as each condition of the method for producing the modified raw material.

In the presence of water, water may be present in the coal and / or iron ore so that the water content is equal to the water content of the coal and / or iron ore slurry. Also it can be carried by reading change the "coal and / or ore slurry 1m ^3" to "coal under the presence of water and / or iron ore 1m ^3".

The use place of the modifier of the present invention is not particularly limited as long as it is possible to add and mix the modifier and the like of the present invention in the presence of water in the coal and / or iron ore. For example, as noted above, the field yard of the mine; Processing facilities such as grinding; Archives such as wild animals; A conveying means such as a belt conveyor, a ship, a wagon or the like; And facilities for use such as steelworks.

As means for using a modifier or the like of the present technology, for example, an apparatus capable of stirring (adding) a modifier or the like of the present technology to the object, for example, And a device capable of adding (spraying) a modifier or the like of this technique to the object conveyed in the conveying means having the kneader and kneading the material.

More specifically, as a continuous reforming treatment system for carrying and bulking, etc., a kneading machine is provided in a conveying means (for example, a belt conveyor or the like) when the object is stacked on a yard, Adding and kneading the modifying agent and the like of the present invention to the object being conveyed by the kneader; A kneader is provided in a means for conveying the object (for example, a conditioned iron ore or the like) from or to the inside of a ship, and a modifying agent or the like of the present technology is added to the object at the time of carry- And the like.

It is also possible to provide a mixing device in a conveying means such as a ship, a wagon, a truck, etc., and to add and mix a modifying agent or the like of the present technique to the object during conveyance.

And a method of adding or kneading a modifier or the like of the present invention to a machine or apparatus capable of stirring (mixing) the object during storage or storage.

In addition, the present invention is not limited thereto. A method of spraying a modifier or the like of the present invention when the slurry having high flowability conveyed by the belt conveyor drops from the conveyor and agitating the slurry in a pile or the like with a bag. A method of adding a modifier or the like of the present invention to a highly fluid slurry returned to a truck, A method of continuously adding a modifier and the like of the present invention by a kneader in the step of taking out wet coal and / or iron ore from a ship to a belt conveyor in a bucket, and then performing a mixing treatment. A method in which a modifier or the like of the present technology is continuously added to iron ore and the like by a kneading machine and the mixed treatment is performed.

Example

Specific examples and the like are described below, but the present invention is not limited thereto.

[Test Example 1] Test for confirming fluidity improvement of iron ore slurry

<Experimental Conditions>

With reference to the physical property test of cement according to JIS R 5201, in order to evaluate the vibration resistance of the modified wet slurry, the number of falling impacts of the table flow was measured from 15 times as determined by JIS to 50 . The case of 0 was also evaluated.

1) slurry was put into a mortar mixer (capacity 3 L). The slurry used at this time was as shown in Table 1.

The slurry is a slurry-like deposit obtained from a steel mill. Crushed (or crushed) iron is contained in an iron concentration of 40 to 80 mass% and includes (crushed) coal.

2) An anionic W / O type emulsion polymer containing 40 mass% of an acrylic acid / acrylamide copolymer was added in an amount shown in Table 2 and stirred for 30 seconds.

In the table, &quot; kg / m ³ &quot; is an amount (kg) used as an emulsion of an anionic W / O type emulsion polymer to 1 m ³ of the slurry.

The acrylic acid / acrylamide copolymer had a molecular weight of 800,000 in terms of intrinsic viscosity. The mol% of the acrylic acid monomer of the acrylic acid / acrylamide copolymer was 35 mol%.

The W / O type emulsion polymer (having a pH of about 6 to 8) can be produced by a known method (for example, see Japanese Examined Patent Publication No. 52-039417 and Japanese Patent Laid-Open Publication No. 51-41090) Specifically, it is possible to obtain by adding an aqueous monomer solution of acrylic acid / acrylamide and a surfactant (including a phase-inverting agent) to mineral oil and emulsion polymerization.

3) Thereafter, an aqueous solution of an inorganic metal salt containing 10 mass% of PAC was added thereto in an amount shown in Table 2, and the mixture was stirred for 30 seconds.

Here, "kg / m ³ " in the table means the amount (kg) of the aqueous solution of the inorganic metal salt to 1 m ³ of the slurry.

4) The sample was taken out and the table flow value (number of drop impacts: 0) was measured in accordance with JIS R-5201.

5) The table flow value after the drop impact of the table was measured.

The results of Test Example 1 are shown in Table 2 and Fig.

As shown in Experiment 2-5, it was confirmed that the flow value of the drop impact 0 times (n = 0) was decreased with an increase in the amount of the water-soluble polymer compound, and the fluidity of the slurry was lowered, that is, improved.

In Experiment 2-5, it was confirmed that the flow value was remarkably improved as compared with Experiment 1 (no treatment: development treatment).

In Experiment 6, the table flow value at the time of the drop impact 50 times (n = 50) was less than 110 mm. When the table flow value after 50 times of the drop impact was 110 mm or less, it was confirmed that the slurry was sufficiently modified so that it became a monolithic form and a stable form.

[Test Example 2] Test for confirming fluidity improvement of coal slurry

The coal slurry of Table 3 obtained in a steel mill was used, and each measurement was carried out in the same manner as in Test Example 1 except that the additive amounts shown in Table 4 (using the same anionic W / O type emulsion polymer and an aqueous solution of an inorganic metal salt as in Test Example 1 ). &Lt; / RTI &gt;

The results of Test Example 2 are shown in Table 4 and Fig.

As in Experiment 7-12, it was confirmed that the flow value of the drop impact 0 times (n = 0) became smaller with an increase in the amount of the water-soluble polymer compound, and the flowability of the slurry was lowered, that is, improved.

It was also confirmed that the results of Experiments 8-12 were significantly improved compared with those of Experiment 7 (no treatment: development treatment).

In Experiment 12, the table flow values at the drop impacts 0 (n = 0) and 50 (n = 50) were less than 110 mm. When the table flow value after 50 times of the drop impact was 110 mm or less, it was confirmed that the slurry was sufficiently modified so that it became a single-phase shape and the shape could be stably maintained.

[Test Example 3] Test for confirming the drying promoting effect of the coal slurry

The coal slurry of Test Example 2 (Table 3) was used as the slurry. At this time, a slurry treatment was carried out in accordance with <Experimental Conditions> of Test Example 1, and as Experiment 14, the addition amounts shown in Table 5 (using the same anionic W / O type emulsion polymer and aqueous inorganic metal salt solution as in Test Example 1) .

The slurry was left untreated and reformed, then allowed to stand at room temperature (25 degrees) and compared with its dry state.

The results of Test Example 3 are shown in Table 5 and Fig.

As in Experiments 13 and 14, it was confirmed that the rate of decrease of the water content of the modified product was faster than that of the untreated slurry. That is, the effect of promoting drying was confirmed by modifying the slurry by adding a chemical.

[Test Example 4] Modification test of iron oxide slurry containing oil

The iron ore slurry of Table 6 obtained in the steel mill was used and the slurry was treated in accordance with Test Example 1 described above and in the amount of addition shown in Table 7, and after the addition of the emulsion polymer and the mixing time.

The results of Test Example 4 are shown in Table 7. As shown in Table 7, in the slurry containing a large amount of oil (n-hexane extract), it is possible to shorten the mixing time until modification by allowing the emulsion polymer to stand after mixing.

To this slurry, n-hexane was added and mixed, and the oil contained in the slurry was extracted by n-hexane. The extracted amount was shown in Table 6 as the oil content in the slurry.

From the above, it was confirmed that the flowability of the slurry can be lowered (improved) by adding and mixing the water-soluble polymer compound to the coal or iron ore slurry. It can be confirmed that the fluidity can be further increased by lowering the flowability.

Further, it was confirmed that by kneading the water-soluble polymer compound and further kneading the inorganic metal salt, a better granulation can be obtained.

As described above, it was confirmed that a water-soluble polymer compound or a water-soluble polymer compound and an inorganic metal salt were used together to obtain a good granulation product from the slurry phase. In addition, in the case of the slurry containing oil, it was confirmed that when the water-soluble polymer compound was added and allowed to mix, the mixing time until the modification was shortened as compared with the case of mixing without leaving.

With this technique, the fluidity of the slurry (sediment in slurry form, etc.) can be lowered and assembled. It is also possible to reduce weight by drying promotion. Since these more excellent modifications can be obtained, it is also possible to increase the number of these modifications, and the space for processing can be saved. Further, the water-soluble polymer compound and the inorganic metal salt to be used are almost harmless, so that the safety of the operator is easily ensured and the workability is improved. Further, when aluminum is reusable, it can be reused as a raw material for steel making, and it is easy to handle even when disposing as waste.

Claims (7)

Characterized in that W / O type emulsion polymer (W / O type emulsion polymer) is added to coal and / or iron ore slurry to mix and to lower the fluidity of the coal and / or iron ore slurry Modification method (modification method).
The method according to claim 1,
Wherein the W / O type emulsion polymer is an anionic W / O type emulsion polymer (anionic W / O type emulsion polymer).
3. The method according to claim 1 or 2,
Wherein the W / O type emulsion polymer is added and mixed, and then an inorganic metal salt is further added.
The method of claim 3,
Wherein the inorganic metal salt is an aluminum salt.
Coal and / or a method for producing the modified raw material to lower the fluidity further comprising a step of adding and mixing a W / O type emulsion polymer to the iron ore slurry.
6. The method of claim 5,
Wherein the W / O type emulsion polymer is added and mixed, and then an inorganic metal salt is further added. delete

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