JP2012214292A - Method for modifying slurry of coal and/or iron ore - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide: a method for modifying slurry of coal and/or iron ore for lowering flowability of sediment more easily; and a method for producing a raw material modified by the method.SOLUTION: There are provided: a method for modifying the slurry of coal and/or iron ore by adding a water-soluble polymer compound to the slurry of coal and/or iron ore and mixing them; and a method for producing the modified raw material by adding the water-soluble polymer compound to the slurry of coal and/or iron ore and mixing them. The water-soluble polymer compound is preferably an anionic W/O emulsion polymer.

Description

  The present technology relates to a method for reforming coal and / or iron ore slurry, and a method for producing a raw material modified thereby.

Coal and / or iron ore (hereinafter also referred to as “iron ore”) is mined in a mine, and is transported by belt conveyors, freight cars, cargo ships, trucks, etc., and is used for storage and storage facilities and processing facilities inside and outside the mining site. Etc., and are stored, stored and processed. Thereafter, the iron ore and the like are transported to a facility (for example, a steel mill, a power generation / industrial heat source generating facility, a factory, or the like) that uses the iron ore and the like by a transportation means such as a belt conveyor.
At such mining sites, transportation means, processing facilities, and use facilities, it is raining on iron ore; watering or discharging water on iron ore during storage or cleaning; coal and / or iron ore And so on. Therefore, iron ore and the like often come into contact with water at mining sites, treatment facilities, use facilities (especially steelworks, etc.).

As described above, when water contacts the coal and / or iron ore and contains water, a slurry of coal and / or iron ore is generated. Such slurries must be reused as raw materials or disposed of as waste.
However, these slurries are highly fluid and difficult to perform various operations and treatments. For example, even if this is stored and stored outdoors, it has high fluidity, so it is difficult to pile up and it is not easy to transport.
For this reason, the reforming method for performing reuse and disposal of the slurry of coal or iron ore is proposed. For example, a method in which a pit is formed in concrete or earth and sand, and a slurry of coal or iron ore is dried in the sun and dehydrated; a method in which dehydration is performed using a filter press dehydrator; a pit is a specific porous body There is known a method (Patent Document 1) in which a fine powder raw material or the like is formed by solid-liquid separation in which a slurry of coal or iron ore is put in and a fine powder raw material or the like in the slurry is adsorbed to a porous body. Yes.

  However, in order to provide a pit, a wide space for forming the pit and a work for pit construction are required in advance, and solidification drying in the pit requires a long time. In addition, in order to use a dehydration apparatus, capital investment and an installation place for installing the apparatus are required in advance, and the equipment must be transported to the specific installation place.

  Therefore, a method capable of modifying coal, iron ore, and a slurry thereof more simply is desired.

JP-A-8-196820

  The present technology provides a simpler method for reforming coal and / or iron ore, and a slurry thereof, and a method for producing a raw material modified thereby, in view of such problems and actual situations.

  As a result of intensive studies, the present inventors have added a water-soluble polymer compound to a coal and / or iron ore slurry, which is difficult to handle due to its slurry state and difficult to easily modify, and mixed. Then, the fluidity of the slurry could be easily reduced, and the resulting modified product was stable and easy to handle.

Accordingly, the present technology relates to the following [1] to [7].
[1] A method for reforming coal and / or iron ore slurry, wherein a water-soluble polymer compound is added to and mixed with coal and / or iron ore slurry.
[2] The reforming method as described in [1] above, wherein the water-soluble polymer compound is an anionic W / O emulsion polymer.
[3] The modification method according to [1] or [2], wherein the inorganic metal salt is further added after the water-soluble polymer compound is added and mixed.
[4] The reforming method according to [3], wherein the inorganic metal salt is an aluminum salt.

[5] A method for producing a modified raw material, comprising adding and mixing a water-soluble polymer compound to a coal and / or iron ore slurry.
[6] The method according to [5], wherein an inorganic metal salt is further added after the water-soluble polymer compound is added and mixed.
[7] A coal and / or iron ore slurry modifier containing a water-soluble polymer compound.

  According to the present technology, coal and / or iron ore slurry generated in coal and / or iron ore, steelworks, etc. can be more easily modified into a deposit that can be easily handled. Thereby, it is possible to obtain the raw material containing coal and / or iron ore which is easy to handle.

Fluidity improvement test of iron ore-based slurry: When water-soluble polymer compound (agent A) and inorganic metal salt (agent B) are added and stirred (1: 1, 2: 1, 3: 2, 3: 3, 5: 5 kg / m ³ ) or when added without addition (0: 0 kg / m ³ ). Fluidity improvement test of coal-based slurry: Results of adding water-soluble polymer compound (agent A) and stirring (1, 2, ³ kg / m ³ ) or stirring without addition (0 kg / m ³ ) Indicates. Drying acceleration test of coal-based slurry: When water-soluble polymer compound (agent A) and inorganic metal salt (agent B) are added and stirred (5: 5 kg / m ³ ) or when added without stirring (0: The result of 0 kg / m ³ ) is shown.

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

  The coal and / or iron ore slurry to be treated is a slurry containing at least coal and / or iron ore. And what is used as iron-making raw materials, such as coke and slag, may be further contained in this.

As mentioned above, as the coal and / or iron ore slurry, on-site yard of mine; processing facilities such as pulverization; storage storage such as field loading; transport means such as belt conveyors, ships, and freight cars; use of steelworks, etc. In facilities, etc., those generated when iron ore contains water are listed.
For example, raw materials such as coal, iron ore, coke, slag, etc. that have flowed out and accumulated in the drainage channel due to rain or dust spraying on the raw material piled up in the outdoor yard; belt conveyor that conveys the raw material Deposited in a sedimentation pond (pound) in which raw material flowing out from a pit or production line for storing water to be washed is poured by rainwater, etc .; collected sediment from a wet dust collection plant or sediment in a yard; outdoor yard Ingredients collected in the field are sprinkled with water for the purpose of dust prevention when transported by a belt conveyor; water is poured into the collected material from the dry dust collection plant and slurried; transport means, treatment Water that has been sprinkled and watered for the purpose of management and storage in facilities, storage management places, etc .; wet conditions that have been immersed in water on the ship for storage and storage purposes; It is below.
A raw material such as fine coal or iron ore tends to become a slurry. Examples of the size of the raw material include particles having a particle diameter (maximum major axis) of 5 mm or less.

  Coal and / or iron ore slurry, which is the subject of this technology, has almost no water retention because it contains charcoal and iron components, so excavated soil and mud from the general construction site. It was thought that it was difficult to handle due to the difference in properties, but it has become possible to make it easier to handle by modifying with this technology.

  The moisture 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 further preferably 20 to 70% by mass. . This moisture content can be measured in accordance with JIS A1125.

  Examples of the water-soluble polymer compound used in the present technology include a synthetic water-soluble polymer compound, a semi-synthetic water-soluble polymer compound, and a natural water-soluble polymer compound. In addition, you may use these following things by 1 type or in combination of 2 or more types.

  Examples of the synthetic water-soluble polymer compound include polyvinyl alcohol, polyvinyl pyrrolidone, poly (meth) acrylamide, poly (meth) acrylic acid or a salt thereof, polyethylene oxide, polyvinyl methyl ether; (meth) acrylic acid, (meth) acrylamide, Examples include maleic anhydride, maleic acid, maleic amide, maleic 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 semi-synthetic water-soluble polymer compound include viscose, methyl cellulose, cationized cellulose, ethyl cellulose, carboxymethyl cellulose, hydroxypropyl cellulose and other cellulose derivatives; pregelatinized starch, carboxyl starch, dialdehyde starch, cationized starch, dextrin, Examples include starch derivatives such as British gum; cationized guar gum, anionized guar gum, methyl glycol chitosan and the like.

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

  The water-soluble polymer compound may be any of anionic, cationic, nonionic, and amphoteric. Of these, anionic and nonionic, which are less toxic to fish, are preferred, and anionic is more preferred.

Of the water-soluble polymer compounds, synthetic water-soluble polymer compounds are preferred.
The synthetic water-soluble polymer compound is preferably a homopolymer or a copolymer having one or more of an anionic monomer and a nonionic monomer as constituent components.
Examples of the anionic group (anionic monomer) include carboxylic acids (monomers) such as acrylic acid, methacrylic acid, maleic acid, fumaric acid, and itaconic acid; styrene sulfonic acid, vinyl sulfonic acid, and 3-allyloxy-2. Examples thereof include sulfonic acids (monomers) such as hydroxypropane sulfonic acid.
Examples of the nonionic group (nonionic monomer) include acrylamide (monomer) and methacrylamide (monomer).

Furthermore, among the synthetic water-soluble polymer compounds, acrylic acid-based and / or acrylamide-based polymers are preferable.
Examples of the acrylic acid-based polymer and / or acrylamide-based polymer include acrylic acid homopolymer, acrylamide homopolymer, acrylic acid / acrylamide copolymer, polyacrylamide partial hydrolyzate, acrylic acid / acrylamide / 2-acrylamide. -2-methylpropanesulfonic acid, acrylic acid / maleic acid copolymer and the like may be mentioned, and these may be used alone or in combination of two or more. Of these, acrylic acid / acrylamide copolymers, acrylamide homopolymers, and polyacrylamide partial hydrolysates 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 (inherent viscosity method). Is preferred.
In the case of an anionic polymer, the content of acrylic acid units in producing the acrylic acid-based and / or acrylamide-based polymer is based on the total amount (100 mol%) of the monomers used. Preferably it is 5 mol% or more, more preferably 20-100 mol%.

  The state when the water-soluble polymer compound is used is not particularly limited, and it is preferable to use the water-soluble polymer compound in the form of powder, liquid or emulsion. In particular, it is preferable to use in the form of powder and emulsion that can be used without increasing the water to be treated. Furthermore, it is suitable to use in the form of an emulsion (preferably a W / O type emulsion) that can reduce the generation of a match pump that improves the slurry reforming effect and fluidity. The water-soluble polymer compound in the form of a W / O emulsion can be produced by a known method (for example, Japanese Patent Publication No. 52-039417 and Japanese Patent Publication No. 51-41090).

The amount of the water-soluble polymer compound used is usually 0.1 to 15 kg, preferably 1 to 10 kg in terms of dry matter, based on 1 m ^{3 of the} coal and / or iron ore slurry. is there. If the amount used is within this range, the coal and / or iron ore slurry can be granulated without excess or deficiency, which is economically advantageous.

  When the water-soluble polymer compound is an aqueous solution (25 ° C .: the concentration of the water-soluble polymer compound is 0.1 to 0.3% by mass), the pH is preferably 6 to 8.

The addition and mixing of the water-soluble polymer compound may be appropriately performed. As an example, after adding the water-soluble polymer compound to the slurry, the mixture is usually mixed for about 0.5 to 60 minutes per 1 m ^{3 of the} slurry. Just do it. Further, when the coal and / or iron ore slurry contains an oil component, it is preferable to add the water-soluble polymer compound and leave it for 5 to 60 minutes before mixing to improve work efficiency.
By performing the mixing (stirring), the water-soluble polymer compound is dispersed in the slurry while water in the slurry is contained in the water-soluble polymer compound. Therefore, the water-soluble polymer compound crosslinks with each particle of coal and iron ore and restrains moisture. Thereby, it becomes possible to obtain a processed product (modified raw material) with reduced fluidity, that is, a modified product.
Although it does not specifically limit about the stirrer or kneading machine used for the said mixing, For example, what is necessary is just to use conventionally well-known things, such as a backhoe, Yumbo, a stabilizer, a biaxial mixer.
At this time, the treatment temperature is not particularly limited, but it is preferable to carry out the treatment at about room temperature (5-35 ° C.) from the viewpoint of reactivity.

  Further, after the water-soluble polymer compound is added and mixed, the inorganic metal salt is added and mixed so that the aggregated modified deposit without stickiness, that is, excellent fluidity. This is suitable because it can be reduced and a modified product (raw material) can be obtained.

The inorganic metal salt is not particularly limited, and examples thereof include monovalent metal salts, divalent metal salts, and trivalent metal salts. Further, for example, it can be classified into metal chloride, metal sulfate and the like.
Examples of the monovalent metal include alkali metals such as sodium and potassium. Examples of the divalent metal include alkaline earth metals such as calcium, barium and magnesium, and divalent iron. Examples of the trivalent metal include trivalent metals such as aluminum and trivalent iron.
Of these, one or more selected from divalent metal salts and trivalent metal salts (excluding basic oxides) are preferred.

Examples of the divalent metal salt include divalent metal chlorides such as calcium chloride, calcium sulfate, barium chloride, magnesium chloride, magnesium sulfate, and ferrous chloride, and divalent metal sulfates.
Examples of the trivalent metal salt include metal oxide chlorides such as polyaluminum chloride (PAC), aluminum sulfate (sulfate band), ferric chloride, and ferric sulfate, and trivalent metal sulfate. It is done. Of these, aluminum salts are preferable, and PAC and sulfuric acid bands are particularly preferable. Thereby, the fluidity | liquidity of a processed material is further reduced and it becomes possible to obtain the modified material with little influence on the periphery even if exposed to rainfall outdoors.
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 preferably used in a powdery or liquid state.

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

  The mixing after the addition of the inorganic metal salt is usually performed for about 1 to 60 minutes, preferably about 1 to 30 minutes after adding the inorganic metal salt to the slurry containing the water-soluble polymer compound. This mixing (stirring) promotes the self-supporting property of the granulated product, so that it is possible to obtain a deposit whose fluidity is more stably reduced, that is, a better-modified deposit.

At this time, as for the stirrer and the kneader to be used, a conventionally known one may be used as described above.
At this time, the treatment temperature is not particularly limited, but it is preferable to carry out the treatment at about room temperature (5-35 ° C.) from the viewpoint of reactivity.

  The coal and / or iron ore slurry is cured for a certain period after the water-soluble polymer compound or the water-soluble polymer compound and the inorganic metal compound are added and mixed, thereby promoting drying and reducing weight. This is preferable because it can be achieved. The curing period is preferably 10 to 150 hours, more preferably 48 to 120 hours from the viewpoint of work efficiency.

  And it is possible to make it stable granulation in this state, and this makes it possible to modify the slurry and reduce the fluidity of the coal and / or iron ore slurry. And the moisture content after drying and curing of the obtained modified product is preferably 10 to 40% by mass, more preferably 15 to 30% by mass in order to reduce fluidity and reduce weight. Is preferred.

The reforming mechanism of this technology will be described.
After adding the water-soluble polymer of the present technology (preferably in an emulsion state) to the coal and / or iron ore and the slurry thereof (in the case of a slurry containing oil, preferably after being left after the addition), mixing Upon stirring, the water-soluble polymer substance is dispersed in the coal and / or iron ore and the slurry in the presence of moisture while containing moisture-containing coal and / or iron ore and the water contained in the slurry.
Although the object such as the coal and / or iron ore slurry contains a high concentration of coal or iron ore, the water-soluble polymer compound and the coal and / or iron ore are subsequently added in the presence of water. It can be cross-linked with stone and granulated. By granulating, moisture is restrained in the particles, and the fluidity of the slurry is suppressed. In addition, the modified product is symptomatically improved by improving the plastic fluidity of the slurry. Coal and / or iron ore before becoming a slurry can be modified by using the water-soluble polymer of the present technology (preferably in an emulsion state) in the presence of water. Therefore, the modified iron ore and the like are easy to handle because slurrying is suppressed even if the iron ore and the like thereafter contact with water.
Furthermore, in addition to the water-soluble polymer compound of the present technology, the self-supporting property of the granulated product can be promoted by adding and stirring an inorganic metal salt. Thereby, it becomes a more stable granulated material.

  In this way, a slurry of coal or iron ore having high fluidity can be quickly reformed and made into a state that can be piled up. Moreover, even if the modified product is exposed to rainfall or the like, it can prevent the piles piled up from collapsing without being slurried again. In addition, the reformed product can have a self-supporting property that can be easily transported by a dumper or the like, and can have a size that can be easily transported by a belt conveyor or the like (for example, a diameter of about 10 mm).

  Here, the coal and / or iron ore slurry has high fluidity, is heavy, and is poor in drainage, so it takes time to carry out, and it cannot be piled up outdoors, and it is difficult to dry. It took a long time.

  For example, conventionally, slurry containing iron-making raw materials such as coal and iron ore is dried in the sun and reduced in fluidity, and then stacked, etc. It is easy and takes a long time to dry. Moreover, there is a possibility that particles on the surface of the mountain piled up due to the rain may flow out due to the rain or the like, or the pile piled up containing the iron-making raw material may collapse.

  In addition, a method of solidifying the surface of the mountain by spraying a W / W type ethylene-vinyl acetate-lactic acid-vinyl resin emulsion on the surface (surface) containing piled steelmaking raw materials is also employed. However, if it is not dried to some extent before piled up coal or iron ore, it cannot be piled up high, and drying takes time. In addition, since it takes several days for the resin emulsion to spread, if there is rain during that time, the drug flows out together with the rainwater and cannot exert its effect.

  Moreover, the method of adding quicklime is also employ | adopted. Calcium oxide (quick lime) is added to the slurry, and the water is evaporated by reaction heat generated by the hydration reaction between the water in the coal or iron ore and calcium oxide, and the slurry is hardened by the hydration reaction. As a result, it is possible to obtain a modified product in a state suitable for reduction in moisture content and for stacking and transportation. However, since a large amount of quicklime is added, the amount of processed material increases, and a processing place and a storage place are widely required, and the carrying amount increases. In addition, since a large amount of highly alkaline powder is used, there is a possibility that an operator may be exposed to alkali when handling it, and there is also a possibility of dust scattering of highly alkaline deposits.

  On the other hand, according to the method of the present technology, a material that does not affect or hardly affects the recycle of iron or the like without adding cement or lime to the coal, steel stone, or slurry thereof (the water-soluble material described above). Additive polymer compound and inorganic metal compound) are mixed and mixed to reduce fluidity, and it becomes possible to obtain a modified raw material (reused raw material) that can be reused. That is, it is also possible to produce coal and / or iron ore and a slurry thereof as a raw material (recycled raw material) using the polymer compound. In addition, since this material has little influence on the human body, there is no problem of alkali exposure during stirring and mixing and transportation, and work efficiency and safety are improved.

  Moreover, since the said coal, steel, and its slurry (sediment) are granulated and promote drainage, it is in the state which is easy to dry. Further, the moisture content of the modified product becomes low and light during drying, and the modified product can maintain stable granulation, so that it can be easily transported and piled up high.

As described above, the water-soluble polymer compound of the present technology is added to a target object in the presence of water and mixed to modify the raw material of coal and / or iron ore; coal and / or iron ore It is possible to modify the slurry. It is also possible to produce a modified coal and / or iron ore raw material by using the water-soluble polymer compound of the present technology.
The water-soluble polymer compound of the present technology is used to produce a modifier for coal and / or iron ore raw material; a modifier for the slurry (hereinafter, also referred to as “modifier”). Can be used. You may mix | blend arbitrary components, such as an inorganic metal salt, an emulsifier, and surfactant, with this modifier as needed. This optional component can be used as an adjunct to the modifier, and may be used simultaneously or separately with the modifier. Each of these agents may be in any state such as liquid, solid, powder.
Here, examples of the object of the present technology include coal and / or iron ore (hereinafter also referred to as “iron ore”), hydrous iron ore, and iron ore slurry, and the like. The previous one may be used.
And in the modification | reformation method of the raw material of the coal and / or iron ore of this technique, and the modification | reformation method of this slurry, the said water-soluble polymer compound (further inorganic metal salt) is made into the said object as it is or in aqueous solution. Can be used. Moreover, it is also possible to use the above-mentioned water-soluble polymer compound (further, an inorganic metal salt) for the object as a modifier. For example, the modifier of the present technology can be added to and mixed with coal and / or iron ore and its slurry to obtain a modified product with better properties (drainage, lightness, granulated shape, etc.). Is possible. In addition, as an example of the processing method, iron ore or the like may be treated with the modifier of the present technology in an aqueous solution state, or the hydrous iron ore or the like may be treated with the powder of the modifier of the present technology or the like. It may be processed.
The “water-soluble polymer compound of the present technology and its aqueous solution, and the modifier containing the water-soluble polymer compound of the present technology” are also referred to as “the modifier of the present technology”.

Therefore, this technique adds the modifier of this technique etc. to the coal and / or iron ore in the presence of water and mixes them, and a method for reforming the coal and / or iron ore; It is also possible to provide a manufacturing method.
Each condition of this reforming method; the modified raw material production method may be the same as each condition of the above-described coal and / or iron ore slurry reforming method;
The “in the presence of water” means that water is present in the coal and / or iron ore so that the water content is the same as the “water content of the coal and / or iron ore slurry”. That's fine. Further, the above “coal and / or iron ore slurry 1 m ³ ” may be read as “coal and / or iron ore 1 m ^{3 in} the presence of water”.

The place of use of the modifier of the present technology is not particularly limited as long as it is a place where coal and / or iron ore can be added and mixed with the modifier of the present technology in the presence of water. . For example, as described above, a mine site yard; a processing facility such as breaking and crushing; a storage and storage site such as field loading; a conveying means such as a belt conveyor, a ship and a freight car; and a use facility such as a steel mill.
As a means for using the modifier of the present technology, for example, an apparatus capable of adding (spreading, etc.) the modifier of the present technology to the object and stirring; Examples thereof include an apparatus capable of adding (spreading, etc.) the modifier of the present technology to the target object and kneading.

More specifically, as a continuous reforming treatment system for transporting / stacking, etc., transport means (for example, a belt conveyor) when the object is stacked in a yard or transferred to a ship, a truck, etc. ) And a kneader to add and knead the modifier or the like of the present technology to the object being conveyed; the object (for example, humidity-controlled iron ore) is put into the ship Alternatively, the means for conveying from the ship may be equipped with a kneader, and the modifier of the present technology may be added and kneaded to the object during loading / unloading, and then loaded on the conveying means.
In addition, a mixing device may be provided in a transportation means such as a ship, a freight car, or a truck, and the modifier of the present technology may be added to and mixed with the object during transportation.
In addition, it is possible to add and knead the modifier of the present technology with a machine or apparatus that can stir (mix) the object during storage / storage.

  Furthermore, although an example is given below, it is not limited to this. A method in which the modifier of the present technology is sprayed when falling from a conveyor of highly fluid slurry that is being conveyed by a belt conveyor, and agitated with a backhoe on a pile or the like. A method of adding a modifying agent of the present technology to a slurry having high fluidity conveyed by a truck, a ship, etc., and performing a mixing process. A method in which a modifier of the present technology is continuously added and mixed by a kneader in a stage of carrying wet coal and / or iron ore from a ship to a belt conveyor by a bucket. A method in which the modifier of the present technology is continuously added to iron ore or the like by a kneading machine when piling into the yard and mixed.

  Specific examples and the like will be described below, but the present technology is not limited thereto.

[Test Example 1] Fluidity improvement confirmation test of iron ore slurry <Experimental conditions>
In order to evaluate the vibration resistance of the modified wet mine slurry with reference to the physical property test of cement according to JIS R 5201, the number of drop impacts of the table flow was increased from 15 times defined by JIS to 50 times. Moreover, the thing of 0 times was also evaluated.
1) 0.5 L of slurry was put into a mortar mixer (capacity 3 L). The slurry used at this time was as shown in Table 1.
The slurry was a slurry-like deposit obtained at an ironworks, and contained (crushed) iron ore with an iron concentration of 40 to 80% by mass, and (crushed) coal was also contained.

2) An anionic W / O emulsion polymer containing 40% by mass of an acrylic acid / acrylamide copolymer was added to this and added in the amount shown in Table 2, followed by stirring for 30 seconds.
Here, “kg / m ³ ” in the table is the amount (kg) of an anionic W / O emulsion polymer used as an emulsion with respect to 1 m ³ of slurry.
The molecular weight of the acrylic acid / acrylamide copolymer in terms of intrinsic viscosity was 8 million. Further, the mol% of the acrylic acid monomer in the acrylic acid / acrylamide copolymer was 35 mol%.
The W / O type emulsion polymer (pH of about 6-8) can be produced by a known method (for example, see Japanese Patent Publication No. 52-039417 and Japanese Patent Publication No. 51-41090). It can be obtained by emulsion polymerization by adding a surfactant (including a phase inversion agent) and an aqueous monomer solution of acrylic acid / acrylamide to the oil.
3) Then, the compounding quantity shown in Table 2 was added to this, and the inorganic metal salt aqueous solution containing 10 mass% of PAC was stirred for 30 seconds.
Here, “kg / m ³ ” in the table is the amount (kg) of the inorganic metal salt aqueous solution used relative to 1 m ³ of the slurry.
4) A 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 dropping impact on the table was measured.

The results of Test Example 1 are shown in Table 2 and FIG.
As in Experiment 2-5, as the amount of water-soluble polymer compound added increases, the flow value of zero drop impact (n = 0) decreases, and the fluidity of the slurry decreases, that is, is improved. Was recognized.
In Experiment 2-5, it was confirmed that the flow value was remarkably improved as compared with Experiment 1 (no treatment: current treatment).
In Experiment 6, the table flow value when the drop impact was 50 times (n = 50) was less than 110 mm. It was confirmed that when the table flow value after 50 drops of impact was 110 mm or less, the slurry was sufficiently modified to form a granular shape and the shape could be stably maintained.

[Test Example 2] Fluidity improvement confirmation test of coal slurry Using the coal slurry of Table 3 obtained at a steel mill, the measured values are the amounts shown in Table 4 according to Test Example 1 described above (Test Example) The slurry was treated with the same anionic W / O type emulsion polymer and inorganic metal salt aqueous solution as in No. 1.

The results of Test Example 2 are shown in Table 4 and FIG.
As in Experiment 7-12, as the addition amount of the water-soluble polymer compound increases, the flow value of zero drop impact (n = 0) decreases, and the slurry-like fluidity decreases, that is, is improved. It was recognized that
Moreover, Experiment 8-12 was recognized that the flow value was remarkably improved as compared with Experiment 7 (no treatment: current treatment).
In Experiment 12, the table flow value when the drop impact was 0 (n = 0) and 50 times (n = 50) was less than 110 mm. It was confirmed that when the table flow value after 50 drops of impact was 110 mm or less, the slurry was sufficiently modified to form a granular shape and the shape could be stably maintained.

[Test Example 3] Test for confirming drying acceleration effect of coal slurry The coal slurry of Test Example 2 (Table 2) was used as the slurry. At this time, in accordance with <Experimental conditions> of Test Example 1, with the addition amount shown in Table 4 (using the same anionic W / O emulsion polymer and aqueous inorganic metal salt solution as in Test Example 1) as Experiment 11 The slurry was processed.
The slurry was left untreated and modified, then allowed to stand at room temperature (25 ° C.), and the dried state was compared.

The results of Test Example 3 are shown in Table 5 and FIG.
As in Experiments 13 and 14, it was found that the rate of decrease in the moisture content of the modified product was faster than that of the untreated slurry. That is, a drying acceleration effect was recognized by modifying the slurry by adding a chemical.

[Test Example 4] Modification Test of Oil-Containing Iron Ore Slurry Using the iron ore slurry shown in Table 6 obtained at a steel mill, according to Test Example 1 above, after the addition amount and emulsion polymer addition shown in Table 7, The slurry was processed during the standing time until mixing.
The results of Test Example 4 are shown in Table 7. As shown in Table 7, in a slurry containing a large amount of oil (n-hexane extract), the mixing time until reforming can be shortened by mixing after leaving after the addition of the emulsion polymer.
In addition, n-hexane was added to this slurry, mixed, and the oil contained in the slurry was extracted with n-hexane, and this extracted amount is shown in Table 6 as the amount of oil in the slurry.

From the above, it was confirmed that the fluidity of the slurry can be reduced (improved) by adding and mixing the water-soluble polymer compound to the coal / iron ore slurry. It was confirmed that it was possible to pile up higher by reducing the fluidity.
Moreover, after kneading the water-soluble polymer compound, it was confirmed that a further improved granulated product can be obtained by further kneading the inorganic metal salt.
As described above, it was confirmed that if a water-soluble polymer compound is used or a water-soluble polymer compound and an inorganic metal salt are used in combination, a good granulated product can be obtained from a slurry. In addition, in the slurry containing oil, it is confirmed that the mixing time until reforming becomes shorter when the water-soluble polymer compound is added and mixed after being allowed to stand as compared with the case where mixing without leaving is allowed. It was done.

  With this technique, the fluidity of the slurry (slurry deposit etc.) can be reduced and granulated. Further, the weight can be reduced by promoting drying. Since such a more excellent modified product can be obtained, the modified product can be piled higher and the processing place can be saved in a space-saving manner. Furthermore, since the water-soluble polymer compound and inorganic metal salt to be used are almost harmless, it is easy to ensure the safety of the operator, and the workability is improved. Furthermore, when aluminum is reusable, it can be reused as a raw material for iron making, and is easy to handle even when disposed as waste.

Claims (7)

  A method for reforming coal and / or iron ore slurry, wherein a water-soluble polymer compound is added to and mixed with coal and / or iron ore slurry.   The modification method according to claim 1, wherein the water-soluble polymer compound is an anionic W / O emulsion polymer.   The reforming method according to claim 1 or 2, wherein an inorganic metal salt is further added after the water-soluble polymer compound is added and mixed.   The reforming method according to claim 3, wherein the inorganic metal salt is an aluminum salt.   A method for producing a modified raw material, wherein a water-soluble polymer compound is added to and mixed with a coal and / or iron ore slurry.   6. The production method according to claim 5, wherein an inorganic metal salt is further added after the water-soluble polymer compound is added and mixed. A coal and / or iron ore slurry modifier containing a water-soluble polymer compound.

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