CN1173018C - Coal briquette having superior strength and briquetting method thereof - Google Patents
Coal briquette having superior strength and briquetting method thereof Download PDFInfo
- Publication number
- CN1173018C CN1173018C CNB018052215A CN01805221A CN1173018C CN 1173018 C CN1173018 C CN 1173018C CN B018052215 A CNB018052215 A CN B018052215A CN 01805221 A CN01805221 A CN 01805221A CN 1173018 C CN1173018 C CN 1173018C
- Authority
- CN
- China
- Prior art keywords
- briquette
- unslaked lime
- fine coal
- mixture
- molasses
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Images
Classifications
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B13/00—Making spongy iron or liquid steel, by direct processes
- C21B13/0046—Making spongy iron or liquid steel, by direct processes making metallised agglomerates or iron oxide
-
- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10L—FUELS NOT OTHERWISE PROVIDED FOR; NATURAL GAS; SYNTHETIC NATURAL GAS OBTAINED BY PROCESSES NOT COVERED BY SUBCLASSES C10G, C10K; LIQUEFIED PETROLEUM GAS; ADDING MATERIALS TO FUELS OR FIRES TO REDUCE SMOKE OR UNDESIRABLE DEPOSITS OR TO FACILITATE SOOT REMOVAL; FIRELIGHTERS
- C10L5/00—Solid fuels
- C10L5/02—Solid fuels such as briquettes consisting mainly of carbonaceous materials of mineral or non-mineral origin
- C10L5/04—Raw material of mineral origin to be used; Pretreatment thereof
-
- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10L—FUELS NOT OTHERWISE PROVIDED FOR; NATURAL GAS; SYNTHETIC NATURAL GAS OBTAINED BY PROCESSES NOT COVERED BY SUBCLASSES C10G, C10K; LIQUEFIED PETROLEUM GAS; ADDING MATERIALS TO FUELS OR FIRES TO REDUCE SMOKE OR UNDESIRABLE DEPOSITS OR TO FACILITATE SOOT REMOVAL; FIRELIGHTERS
- C10L5/00—Solid fuels
- C10L5/02—Solid fuels such as briquettes consisting mainly of carbonaceous materials of mineral or non-mineral origin
- C10L5/06—Methods of shaping, e.g. pelletizing or briquetting
- C10L5/10—Methods of shaping, e.g. pelletizing or briquetting with the aid of binders, e.g. pretreated binders
- C10L5/14—Methods of shaping, e.g. pelletizing or briquetting with the aid of binders, e.g. pretreated binders with organic binders
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B13/00—Making spongy iron or liquid steel, by direct processes
- C21B13/0066—Preliminary conditioning of the solid carbonaceous reductant
Landscapes
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Engineering & Computer Science (AREA)
- Geochemistry & Mineralogy (AREA)
- Life Sciences & Earth Sciences (AREA)
- Environmental & Geological Engineering (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geology (AREA)
- Metallurgy (AREA)
- Materials Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Solid Fuels And Fuel-Associated Substances (AREA)
- Manufacture And Refinement Of Metals (AREA)
Abstract
A briquette with a superior strength and process for making the briquette. The briquette is composed of 100 weight parts of fine coal, 1 to 5 weight parts of quicklime and 7 to 15 weight parts of molasses. The process involves the steps of mixing 1 to 5 weight parts of quicklime with 100 weight parts of fine coal, and aging the mixture, mixing 7 to 15 weight parts of molasses with the aged mixture, and stirring the mixture, and compression-molding the stirred mixture to form a briquette.
Description
Background of invention
Invention field
The present invention relates to a kind of briquette that is used for metallurgy.More particularly, the present invention relates to a kind of briquette, it can make from fine coal by adopting unslaked lime and molasses (molasses), thereby can save the step of dry fine coal, show good intensity because the Calciofon that the chemical reaction between unslaked lime and molasses forms is good for simultaneously via the thermopositive reaction that is present in moisture content in the fine coal and unslaked lime.The invention still further relates to a kind of method for preparing this class briquette.Because the briquette according to the present invention's preparation has good physical strength, so it can be suitable for the iron Preparation Method of smelting reduction, this method is the iron Preparation Method that proposes recently.
The explanation of correlation technique
Know, FINEX and COREX method, or the iron Preparation Method of smelting reduction is being favourable aspect the utilizability of fuel, because adopt coal to substitute the fuel of coke as smelting furnace.But, for fuel, if coal is that to have particle size be 8mm or littler fine coal, then it is difficult to perfect combustion in smelting furnace, and is trapped within the collector frequently.And if a large amount of fine coal is trapped in the collector, then this method will lose thermal equilibrium, thereby make this method cause various problems.Therefore, this class fine coal application among iron Preparation Method should be restricted.But, the coal that is used for iron Preparation Method at present mainly comprises the fine coal that is not more than 8mm.
The application of fine coal in iron Preparation Method is restricted, so it is mainly used in the coal of Pulverized coal injecting (PCI) or conduct preparation coke.But, be specific owing to can be used for the characteristic of the coal of COREX method, so there is restriction in this class coal in the application of non-COREX purpose.Therefore, people wish to obtain a kind of coalescent fine coal of proper method that passes through to prepare the method for briquette.But,, also do not find fine coal to be made the successful methods of the briquette of the novel iron Preparation Method that is suitable for FINEX and COREX with regard to the present state of the art.
For example, English Patent No.GB2227024A and U.S. Pat 4,738,685 disclose the method that the mixture that adopts fine coal, molasses and a kind of inorganic hardener prepares briquette.In these methods, briquette should at room temperature harden 1-3 days, or hardened 1 hour in stove under 200-300 ℃ temperature, and to improve the intensity of briquette, because the processing efficiency of this cure step is very poor, it directly causes the low initial strength of briquette.
When adopting a large amount of briquettes in a kind of method such as method for smelting reduction, described briquette is carried via conveying belt and is stored.If briquette does not have enough initial strengths, then adopting conveying belt to carry out in the course of conveying, they will be broken.For fear of this class breakage, must after the briquette moulding, be heated more than 200 ℃.But this extra heating steps needs large-scale heat drying equipment, thereby produces the economical load of high cost and underproductivity in the production of briquette.
Simultaneously, a kind of method that adopts the fine coal of producing coke to prepare briquette is disclosed in (the open date: April 11 nineteen ninety-five) among the open No.Heisei 7-97576 of Japan's special permission.
According to this method, a kind of binding agent such as coal tar or pitch are heated to softening temperature (about 150 ℃) or higher, so that fusing.Then, an amount of described melt is joined in the fine coal.Mixture is thoroughly mixed, and make mixture carry out compressed moulding to being lower than softening temperature by cooling off this fusing binding agent.Like this, just prepare a kind of briquette of needs.The heat fused of this class binding agent and cooling can make coal particle bond together consumingly mutually, make it to have high intensity, can stand breakage in the mechanical transportation process.But this class adhesive heating requires large-scale heating system to the method for softening temperature, and it can emit deleterious gas in operating process, makes Working environment become dangerous.In order to prevent and handle obnoxious flavour, may need additional expense.
And, the iron Preparation Method of a kind of smelting reduction, need reach hundreds of tons briquette every day.Therefore, before use, briquette need be piled up for some time under the environment in the open.In summer, external temperature is because solar radiation can be elevated to 40-60 ℃.Therefore, near the bituminous cement of softening temperature this temperature may be softened again, and briquette is mutually adhered together, and makes to be difficult to handle by mechanical means.
And fine coal contains some moisture content usually.There is a problem in the briquette that makes by compressed moulding fine coal at room temperature, is exactly that excess water content can reduce its cold ultimate compression strength.For this reason, the described method for preparing briquette has the low rate of recovery, so extra drying step is essential, thereby has increased expense and has reduced throughput.
Summary of the invention
Therefore, made the present invention at the problems referred to above, an object of the present invention is to provide and have superior strength and good low-temperature stability and be easy to a large amount of briquettes of handling and preparation method thereof and briquette is to be prepared from fine coal by a kind of molasses binding agent and a kind of additive that is used for regulating the water content in the fine coal, the preparation of this briquette does not need to adopt any extra drying and heating steps that is used for removing moisture content in the fine coal.
So according to the present invention, above-mentioned purpose and other purpose can be achieved by a kind of briquette that has high strength and contain 100 weight part fine coal, 1-5 weight part unslaked lime and 7-15 weight part molasses is provided.
And according to the present invention, above-mentioned purpose and other purpose can be achieved by the method that provides a kind of preparation to have the briquette of superior strength, and this method may further comprise the steps:
(a) mix 100 weight part fine coal and 1-5 weight part unslaked lime, and this mixture of slaking;
(b) mix the slaking mixture of 7-15 weight part molasses and step (a), and stir; With
(c) stirring the mixture of compressed moulding step (b) forms briquette.
Brief Description Of Drawings
Following detailed description in conjunction with the drawings, above and other objects of the present invention, feature and other advantage will become apparent clear, wherein:
Fig. 1 is for preparing the synoptic diagram of the method for briquette according to the present invention.
The explanation of preferred embodiment
The invention relates to a kind of briquette that has high strength and contain 100 weight part fine coal, 1-5 weight part unslaked lime and 7-15 weight part molasses.
The inventor by research seek a kind of do not need to remove moisture content in the fine coal and coalescent fine coal prepare the method for briquette, the while can guarantee that briquette has the high strength that is applicable to the iron Preparation Method of smelting reduction.They find that finally the moisture content that is present in the fine coal can be converted into white lime (Ca (OH) via moisture content and unslaked lime (CaO)
2) thermopositive reaction and be removed, as described below:
[reaction 1]
And, have been found that when molasses join in the mixture of fine coal and unslaked lime as binding agent, its can and unslaked lime generation chemical reaction, form the Calciofon key, thus, it can avoid being dissolved among the moisture content of mixture.Like this, after the compressed moulding step of preparation briquette, prepare without any additional heating-drying step and a kind ofly to have high-intensity briquette and just become possibility.Based on the above-mentioned discovery and the fact, formed the present invention.
To be explained in detail the present invention below.
Be used for fine coal of the present invention and comprise that the particle size specification of coal is not suitable for the coal of COREX method.It has been generally acknowledged that the coal that particle size is not less than 8mm is used for typical C OREX method, so, in the present invention, use the fine coal of particle size less than 8mm.Preferably, being used for fine coal of the present invention is to grind to form the particle size fine coal of the highest about 4mm.When the particle size of fine coal was excessive, the pressure that then is applied to compression-moulding briquette will improve, and this will cause the briquette fragmentation, thereby damaged its intensity.More preferably, the distribution of fine coal with particle size of about 4mm account for total fine coal 80% or more.
According to the present invention, the fine coal that contains moisture content does not need through independent drying step.Water content in this fine coal is relevant with the add-on of unslaked lime.Most preferably, consider the add-on of unslaked lime, contain the moisture content of 6-15 weight % in the fine coal, preferably about 6-12% moisture content.When fine coal contains the moisture content of lesser amt, may carry out fully inadequately with the reaction of unslaked lime, thereby cause briquette intensity to reduce.On the other hand, when fine coal contained too much moisture content, briquette is moulding effectively, thereby was difficult to guarantee the quality of briquette.
According to the present invention, unslaked lime plays two kinds of effects aspect the high strength briquette is provided: one is that it removes moisture content from this fine coal, and another is that it is by forming the intensity that the Calciofon key has improved briquette.Shown in above-mentioned reaction 1, unslaked lime (CaO) via with this fine coal in the thermopositive reaction carried out of the moisture content that exists generate white lime, thereby remove the moisture content in the fine coal.And this unslaked lime can carry out chemical reaction with molasses and form the Calciofon key, and it can improve the intensity of briquette.In addition, because the formation of this class Calciofon key can avoid molasses to be dissolved among the contained moisture content of fine coal.
According to the present invention, with respect to 100 weight part fine coal, the adding quantity of unslaked lime is the 1-5 weight part.If the adding quantity of unslaked lime is less than 1 weight part, then it can not be realized effectively via the effect of removing moisture content with the moisture content reaction from fine coal, and it can not be by forming the Calciofon key with the molasses reaction, thereby can cause that briquette intensity reduces.If unslaked lime adds quantity greater than 5 weight parts, then the physicals of resulting briquette can suffer damage.
Preferably can be used for unslaked lime of the present invention and have the particle size of the highest about 1mm.This unslaked lime has the particle size of the highest about 1mm, and particle size the distribution of the unslaked lime of high about 0.3mm to be greater than or equal to 50 weight % be most important.When the unslaked lime size more hour, its specific surface area is big more.So, have the unslaked lime of smaller particle size can be advantageously by with fine coal in the reaction of moisture content be converted into white lime.When the particle size of unslaked lime when the distribution of the unslaked lime of high 0.3mm is lower than 50% greater than 1mm and particle size, then the reaction of moisture content can not be carried out fully in unslaked lime and the fine coal, may leave unreacted unslaked lime in the briquette that finally obtains.These unreacted unslaked limes tend to react with airborne moisture content, thus the intensity of infringement briquette.
According to the present invention, use molasses as binding agent, it can keep its viscosity when room temperature, so be easy to handle in a large number, do not have use to be difficult to solid materials such as a large amount of coal tar of handling or pitch.
According to the present invention, with respect to 100 weight part fine coal, the adding quantity of molasses is controlled in the 7-15 weight part.When the adding quantity of molasses was lower than 7 weight parts, the intensity of briquette was very poor.When the adding quantity of molasses during, when mixing, may there be gluing problem with fine coal greater than 15 weight parts.
Preferably, be benchmark with the molasses gross weight, molasses have the solids content of 70-85 weight %.Solids content as fructose mols is lower than 70 weight %, and the briquette that then makes can have low intensity, and this is that it shows as actual adhesive property because lack contents of saccharide in molasses.And water content is very high in the molasses, will obtain the briquette that intensity suffers damage.Greater than 85 weight %, then the viscosity of molasses will increase as the solids content of fructose mols, make uniform mixing with other composition difficulty that becomes.
When molasses too during thickness, can use the water that is no more than 10 weight % based on used molasses weight that it is diluted.
And the contriver finds that also the intensity of briquette is mixed the influence of order, and they have developed a kind of working specification, according to these rules, the raw material that contains fine coal, unslaked lime and molasses of the present invention mixed and/or slaking with the preparation briquette.
So, according to another aspect of the present invention, the invention relates to the method that a kind of preparation has the briquette of superior strength, may further comprise the steps:
(a) 100 weight part fine coal and 1-5 weight part unslaked lime are mixed, and this mixture of slaking;
(b) mix the slaking mixture of 7-15 weight part molasses and step (a), and stir; With
(c) stirring the mixture of compressed moulding step (b) forms briquette.
Fig. 1 has provided the series of steps of this method.
At first, fine coal is mixed with unslaked lime.With respect to 100 weight part fine coal, the consumption of unslaked lime is the 1-5 weight part.Preferably, adopt a kind of mixing tank (4: the duplex mode) carry out this mixing, to obtain a kind of uniform mixture.The about 1-3 of described mixing minute.
After mixing, preferably carry out maturation process, thereby make unslaked lime be converted into white lime, shown in above-mentioned reaction formula 1.Although unslaked lime becomes the conversion of white lime and can carry out in described mixing tank, because the residence time in mixing tank is shorter, so maturation process is restricted.Therefore, adopt a container such as hopper to be used for long storage, the reaction of reaction 1 can be carried out.At this moment, the preferred curing time is about 2 minutes to 2 hours.If this time is less than 2 minutes, then unreacted unslaked lime will remain in the briquette that makes, so the intensity of briquette will be undermined.If this time was longer than 2 hours, then throughput will reduce.
After the first mixture slaking of fine coal and unslaked lime, in this mixture, add molasses, with respect to 100 weight part fine coal, its add-on is the 7-15 weight part.In this stage, also can use blender (5).A kind of injection nozzle of preferred employing sprays molasses to improve mixing efficiency.
Simultaneously, when mixing in this mixing tank, unslaked lime can carry out chemical reaction with molasses, forms the Calciofon key, and unreacted unslaked lime can react with the moisture content in the molasses and be converted into white lime.But because the residence time in this mixing tank is short, the chemical reaction between unslaked lime and the molasses is restricted.
But,, then may produce more Calciofon to promote to improve the sclerosis of briquette, for briquette provides increased intensity if the residence time of mixture in mixing tank is elongated.So, according to the present invention, stirred for second mixture for some time, make the reaction that generates Calciofon to proceed.Preferably, this whipping step is to adopt a kind of kneader (by mark 6 expressions, it is different from the mixing tank that is used for above-mentioned mixing step in Fig. 1) to carry out for some time.
Kneader (6) has drum, and it is vertical the placement, comprise one its go up pack into material in the tube of subsidiary vaned central shaft and stirring.In this kneader, stir second mixture, because the formation of Calciofon key has improved sclerosis efficient.The blade of design and installation is to be used for stirring the mixture.Kneader is according to the churning time of the amount adjusting that mixture wherein is housed to mixture.
According to the present invention, when churning time was lower than 2 minutes, the intensity of briquette will reduce, and when churning time during greater than 50 minutes, it is dry that mixture becomes, and like this, the intensity of briquette also can reduce.So preferred churning time is between 2-50 minute.
Second mixture of the sclerosis efficient with raising that so obtains is coated on the roll press (7), makes briquette with superior strength thereby this press applies uniform pressure to mixture.
In the present invention, adopt conveying belt (8) that prepared briquette is transported to briquette storehouse (9),, and do not need an independent heat drying step so that at room temperature store them.Ropy briquette is removed from described conveying belt (8), is transported in the mixing tank (5) that holds remaining mixture via a recovery bin (10), and utilizes by repeating a series of step again.
The times that need about 3 minutes-3 hours via these steps from fine coal storehouse (1) to roll press (7) are to form briquette.Simultaneously, the mark among Fig. 11,2 and 3 is represented fine coal storehouse, unslaked lime storehouse and molasses storehouse respectively.
As mentioned above, the invention provides the formed briquette of step through mixing fine coal and unslaked lime and this mixture of slaking, mixing molasses and described slaking mixture and stir, wherein, the liquid molasses can fully infiltrate in the mixture, so that form the Calciofon key, thereby form briquette with superior strength.Therefore, the briquette that makes according to the inventive method has good initial strength, thereby can directly use, and does not need to carry out independent cure step.
On the other hand, described unslaked lime and moisture content and molasses react very apace.Therefore, no matter be that fine coal mixes with molasses earlier again and then mixes with unslaked lime, still above-mentioned three kinds of raw materials mixed simultaneously, owing to described unslaked lime and moisture content with molasses react very apace and these components of hardening, so, described unslaked lime is dispersed among this mixture.Therefore, can not obtain to have the briquette of superior strength.
Hereinafter, will be for a more detailed description to the present invention in conjunction with different examples.These embodiment only are the purposes that is used for illustration, and the present invention can not be interpreted as only being confined to these embodiment.
Embodiment 1
According to the ratio of components shown in the following table 1, prepare 2 kinds of samples of the present invention and 4 kinds of samples as a comparison case.The fine coal that is not more than 3.4mm is mixed equably with unslaked lime, controlling the water-content that exists in the described fine coal, then, mix with molasses as binding agent.Adopt the briquette roll press at room temperature to compress resulting mixture, to form a kind of briquette of pillow, its diameter is 63.5mm, and wide is 25.4mm, and thickness is 19.1mm.
Table 1
| Embodiment | ≤ 3.4mm fine coal (weight part) | Additive | Molasses (weight part) | |
| Compound | Quantity (weight part) | |||
| Example 1 | 100 | |
3 | 10 |
| Example 2 | 100 | |
2 | 8 |
| Comparative Examples 1 | 100 | - | - | 10 |
| Comparative Examples 2 | 100 | |
3 | 10 |
| Comparative Examples 3 | 100 | |
3 | 10 |
| Comparative Examples 4 | 100 | Unslaked lime | 1 | 6 |
In table 1, example 1 of the present invention and 2 is by the unslaked lime uniform mixing with fine coal and 2-3 weight part, then mixes the resulting mixture of compressed moulding at room temperature also with 8-10 weight part molasses and the briquette for preparing.
On the other hand, the briquette of Comparative Examples 1 uses 10 weight part molasses adhesive preparation to obtain by relative 100 weight part fine coal.The briquette of Comparative Examples 2 is by with 100 weight part fine coal and 3 weight part lime carbonate (CaCO
3) uniform mixing, then mix also the resulting mixture of compressed moulding at room temperature prepares with 10 weight part molasses.The briquette of Comparative Examples 3 is by with 100 weight part fine coal and 3 weight part white limes (Ca (OH)
2) uniform mixing, then mix also the resulting mixture of compressed moulding at room temperature prepares with 10 weight part molasses.The briquette of Comparative Examples 4 is by with 100 weight part fine coal and 1 weight part unslaked lime uniform mixing, and then mixes also the resulting mixture of compressed moulding at room temperature prepares with 6 weight part molasses.
After moulding, immediately briquette is tested, with anti-crushing property and the powder ratio of measuring them.The test of anti-crushing property is to carry out for last 4 times from 5m height free-falling to an iron plate by the briquette that makes an about 2kg.Then, weighed more than or equal to the briquette fritter of 10mm in the back of landing, and calculate its anti-crushing property by following equation 1.To weighing less than the briquette fritter of 6.3mm after landing and calculating the powder ratios by following equation 2.
[equation 1]
Anti-crushing property (%)=(the landing back is more than or equal to the gross weight of the preceding briquette of gross weight/landing of the briquette fritter of 10mm) * 100
[equation 2]
Powder is than (%)=(gross weight that is less than or equal to briquette before the gross weight/landing of briquette fritter of 6.3mm after the landing) * 100
The anti-crushing property of the every kind of briquette for preparing according to the composition of table 1 and powder are than as shown in table 2 below.
Table 2
| Embodiment | Anti-crushing property (%) | Powder is than (%) |
| Example 1 | 89.7 | 8.8 |
| Example 2 | 80.5 | 15.5 |
| Comparative Examples 1 | 20.0 | 71.6 |
| Comparative Examples 2 | 15.1 | 75.5 |
| Comparative Examples 3 | 69.6 | 23.3 |
| Comparative Examples 4 | 31.9 | 58.8 |
As shown in table 2, the example 1 and 2 that its composition is positioned within the scope of the invention provides the briquette with superior strength, it is characterized in that anti-crushing property greater than 80%, and the powder ratio is less than 16%.On the other hand, its composition not Comparative Examples 1-4 within the scope of the invention provides the briquette with low anti-crushing property and high powder ratio, compares with example of the present invention, shows that they have low intensity.
With particle size more than or equal to the fine coal of 3.4mm in the Muller mixing tank with additive uniform mixing 1 minute, and slaking for some time.In described slaking mixture, add mix 3 minutes as the molasses of binding agent and in described Muller mixing tank after, be transported to described mixture in the kneader and stir for some time to improve sclerosis efficient.Adopt a kind of briquette roll press at room temperature the mixture that obtains to be carried out compressed moulding.Form the pillow briquette, its diameter is 63.5mm, and wide is 25.4mm, and thickness is 19.1mm.
Table 3
| Embodiment | Fine coal | Additive | Molasses | The curing time of additive-fine coal (min) | The churning time min of additive-fine coal | |||
| Quantity (weight %) | Water content (weight %) | Compound | Quantity (weight part) | ≤ O.3mm (weight part) | Quantity (weight part) | |||
| Example 1 | 100 | 9.7 | |
3 | 84 | 8 | 10 | 5 |
| Example 2 | 100 | 9.6 | |
3 | 78 | 8 | 30 | 5 |
| Example 3 | 100 | 9.7 | |
3 | 78 | 8 | 60 | 10 |
| Example 4 | 100 | 9.1 | |
3 | 81 | 8 | 5 | 7 |
| Example 5 | 100 | 9.4 | |
3 | 60 | 8 | 5 | 12 |
| Example 6 | 100 | 8.5 | |
3 | 95 | 8 | 5 | 20 |
| Example 7 | 100 | 14.5 | |
3 | 95 | 10 | 10 | 10 |
| Comparative Examples 1 | 100 | 8.9 | |
3 | 78 | 8 | 0 | 5 |
| Comparative Examples 2 | 100 | 8.1 | |
3 | 78 | 8 | 1 | 60 |
| Comparative Examples 3 | 100 | 8.7 | |
3 | 15 | 8 | 10 | 5 |
| Comparative Examples 4 | 100 | 4.9 | |
3 | 78 | 8 | 10 | 5 |
| Comparative Examples 5 | 100 | 8.5 | - | - | - | 10 | 0 | 10 |
| Comparative Examples 6 | 100 | 9.4 | |
3 | 100 | 8 | 10 | 5 |
| Comparative Examples 7 | 100 | 8.2 | |
3 | 92 | 10 | 1 | 10 |
| Comparative Examples 8 | 100 | 7.1 | Unslaked lime | 1 | 95 | 6 | 1 | 10 |
In table 3, the briquette of example 1-7 is according to the inventive method, by uniform mixing fine coal and unslaked lime, this mixture of slaking, mix this slaking mixture and molasses, in a kneader, stir this mixture, and compressed moulding at room temperature prepare.
On the other hand, the briquette of Comparative Examples 1 be by uniform mixing fine coal and unslaked lime, then not to fine coal and the mixture of unslaked lime carry out slaking just mixes with molasses, stirring obtains in a kneader mixture, at room temperature compressed moulding prepares afterwards.
The briquette of Comparative Examples 2 by uniform mixing fine coal and unslaked lime, this mixture of slaking 1 minute, make this mixture mix with molasses, in a kneader, stir this mixture 60 minutes, and the described mixture of compressed moulding at room temperature prepare.
The briquette of Comparative Examples 3 is according to preparing with example 1 similarity method, and still, this Comparative Examples uses the particle size that contains 15 weight % to be not more than the unslaked lime of the component of 0.3mm.
The briquette of Comparative Examples 4 is according to preparing with example 1 similarity method, and still, it has adopted water content is the fine coal of 4.9 weight %.
The briquette of Comparative Examples 5 by with fine coal only with the molasses uniform mixing, in a kneader, stir this mixture 10 minutes, and compressed moulding at room temperature prepare.
The briquette of Comparative Examples 6 is by preparing with example 1 similarity method, and still, it only uses fine coal and white lime.
The briquette of Comparative Examples 7 by with fine coal and lime carbonate uniform mixing, this mixture of slaking 1 minute, with this mixture mix with molasses, in a kneader, stir this mixture 10 minutes, and this mixture of compressed moulding at room temperature prepare.
The briquette of Comparative Examples 8 by with fine coal and unslaked lime uniform mixing, this mixture of slaking 1 minute, make this mixture mix with molasses, in a kneader, stir this mixture, and this mixture of compressed moulding at room temperature prepare.
After it forms immediately with 24 hours after, the anti-crushing property and the powder ratio of every kind of briquette that mensuration is formed by example and Comparative Examples.The gained result is as shown in table 4.
Table 4
| Example | After the formation immediately | Form back 24 hours | ||
| Anti-crushing property (%) | Powder is than (%) | Anti-crushing property (%) | Powder is than (%) | |
| Example 1 | 97.2 | 2.6 | 84.6 | 11.6 |
| Example 2 | 95.1 | 4.1 | 82.5 | 13.7 |
| Example 3 | 94.4 | 4.5 | 86.3 | 10.8 |
| Example 4 | 95.8 | 3.7 | 81.5 | 14.9 |
| Example 5 | 95.3 | 4.1 | 77.4 | 18.9 |
| Example 6 | 88.2 | 9.3 | 80.9 | 17.7 |
| Example 7 | 94.5 | 4.3 | 81.2 | 13.2 |
| Comparative Examples 1 | 91.7 | 7.0 | 69.9 | 23.9 |
| Comparative Examples 2 | 69.3 | 25.0 | 56.8 | 37.5 |
| Comparative Examples 3 | 72.1 | 22.4 | 62.4 | 31.0 |
| Comparative Examples 4 | 55.0 | 38.3 | 49.3 | 42.7 |
| Comparative Examples 5 | 20.0 | 71.6 | 33.0 | 58.6 |
| Comparative Examples 6 | 73.0 | 21.6 | 57.5 | 35.8 |
| Comparative Examples 7 | 15.1 | 75.5 | 42.9 | 47.8 |
| Comparative Examples 8 | 31.9 | 58.8 | 73.6 | 21.8 |
As shown in table 4, the briquette of example 1-7 has good intensity, it is characterized in that its anti-crushing property greater than 88%, and its powder ratio is less than 10%.And as measuring after 24 hours, described briquette still shows high intensity, has greater than 77% anti-crushing property with less than 19% powder ratio.
On the contrary, the briquette that Comparative Examples 1-8 provides has low anti-crushing property and high powder ratio, is defective briquette thereby be identified as, and can not be used for the smelting reduction stove.
Table 5 has provided the anti-crushing property of coal and briquette sample and the scope of powder ratio.The anti-crushing property of described coal is within the tolerance interval of the iron Preparation Method of actual smelting reduction.If the anti-crushing property of coal is lower than this tolerance interval, then the temperature of molten iron can reduce, thereby causes the throughput that descends and cause problem in manufacture method.And, compare with regard to powder, when having the coal that is higher than tolerance interval numerical value or briquette when being charged in the smelting furnace, incomplete combustion can take place.Like this, a large amount of unburned coals are collected by collector, thereby have improved process cost, have a negative impact for operation.For this reason, need to adopt the stricter the best and the briquette of tolerance interval numerical value, this is because the powder that is formed by these briquettes has the particle size of reduction.
Table 5
| Sample | Anti-crushing property (%) | Powder is than (%) | ||
| Optimum range | Tolerance interval | Optimum range | Tolerance interval | |
| Coal (10-60mm) | 80 or bigger | 70 or bigger | 10 or littler | 5 or littler |
| Briquette (10-60) | 80 or bigger | 70 or bigger | 25 or littler | 20 or littler |
For the performance change of estimating the briquette that makes and the relation of mixing the order variation, carry out carrying out following experiment under the situation of blended mixing order with fine coal at change unslaked lime and molasses.
At first, as shown in table 6, to be of a size of 3.4mm or littler fine coal (from Australia:Mt.Thorley), being 3 weight parts with this fine coal consumption of relative 100 weight parts equably in a Muller mixing tank, unslaked lime mixes, and slaking 10 minutes.Then, in this mixture, add the molasses of 8 weight parts, and stirred 5 minutes, with the sclerosis efficient that obtains to improve at a kneader.The mixture that at room temperature adopts the compression of briquette roll press to obtain forms a kind of pincushion briquette, and its diameter is 63.5mm, and wide is 25.4mm, and thickness is 19.1mm.
In order to prepare other briquette, to be 8 weight parts with this fine coal consumption of relative 100 weight parts in a Muller mixing tank mixed 5 minutes as the molasses of binding agent the fine coal that will have an above-mentioned particle size equably.Then, in this mixture, add the unslaked lime of 3 weight parts, and in described Muller mixing tank, mixed 3 minutes, then in a kneader, stirred 5 minutes, with the sclerosis efficient that obtains to improve as stiffening agent.The mixture that obtains is at room temperature compressed, form a kind of briquette.
In order to prepare other briquette, will having as mentioned above, the fine coal of identical particle size mixed 5 minutes equably simultaneously with 3 weight part unslaked limes and 8 weight part molasses in a Muller mixing tank.Then in a kneader, this mixture was stirred 5 minutes, to improve sclerosis efficient.The mixture that at room temperature adopts the compression of briquette press to obtain forms a kind of pincushion briquette, and its diameter is 63.5mm, and wide is 25.4mm, and thickness is 19.1mm.
Table 6
| Embodiment | Fine coal (weight part) | Molasses (weight part) | Unslaked lime (weight part) | Mix order | |
| First | Second | ||||
| Example 1 | 100 | 8 | 3 | Unslaked lime | Molasses |
| Comparative Examples 1 | 100 | 8 | 3 | Molasses | Unslaked lime |
| Comparative Examples 2 | 100 | 8 | 3 | Unslaked lime and molasses | |
For the briquette that makes, carrying out dip test to estimate its anti-crushing property and powder ratio after immediately with 24 hours after the preparation of these briquettes.Test-results is as shown in table 7.Evaluation method is by carrying out with example 1 same procedure.
Table 7
| Embodiment | After the formation immediately | Form back 24 hours | ||
| Anti-crushing property (%) | Powder is than (%) | Anti-crushing property (%) | Powder is than (%) | |
| Example 1 | 97.2 | 2.6 | 84.6 | 11.6 |
| Comparative Examples 2 | 64.3 | 27.6 | 75.2 | 14.6 |
| Comparative Examples 3 | 71.5 | 22.2 | 88.8 | 7.0 |
Referring to table 7, as can be seen, according to fine coal mix earlier with unslaked lime, slaking, then with the example 1 of molasses blended method, provide a kind of have anti-crushing property be 95% or bigger and powder than being 5% or littler briquette.
On the other hand, Comparative Examples 1 and 2 (they are outside the scope of the invention) provides the briquette of anti-crushing property with reduction and the powder ratio that increases, thereby has compared the intensity that shows reduction with example 1.To be described in more detail it now.
Comparative Examples 1 is to adopt the wherein first method of then mixing with unslaked lime with the formation briquette of mixing with molasses of fine coal.
For making molasses and fine coal carry out the blended situation before adding unslaked lime, the mixture of fine coal and molasses has total water content of raising, and this is the moisture content that contains 15-30 weight % because of molasses in general.Like this, the hydroxylation that unslaked lime is converted into white lime carries out very soon, thereby when unslaked lime is mixed with described mixture, the chemical reaction of Calciofon key takes place to form on the unslaked lime surface that contacts with this mixture.Consequently, before unslaked lime was uniformly distributed in described mixture, described mixture just hardened.Consequently, the briquette that forms by this method has 64.3% low initial strength.On the other hand, have been found that after 24 hours that described briquette shows the anti-crushing property of raising.This is owing to the chemical reaction that does not produce the Calciofon key is completely proceeded as time goes by.
Comparative Examples 2 is to adopt fine coal and unslaked lime and molasses to mix simultaneously to form the method for briquette.
Like this, similar to Comparative Examples 1, equably with before fine coal mixes, described unslaked lime and the reaction of described molasses produce the Calciofon key, thereby make described mixture cures at unslaked lime and molasses.If described mixture is sclerosis earlier, then can not make the uniform mixture of forming by fine coal, unslaked lime and molasses.Consequently, the briquette that forms by this method has 71.5% initial strength, and it is lower than the intensity of example briquette of the present invention.On the other hand, have been found that after 24 hours that described briquette shows the anti-crushing property of raising.This is owing to the described chemical reaction that does not produce the Calciofon key is completely proceeded as time goes by.
Can clearly be seen that by above-mentioned explanation, the invention provides a kind of briquette, thereby can strengthen its competitive power useful and effectively with the needed suitable strength of novel iron Preparation Method (FINEX and COREX method).
Although described the preferred embodiment of the invention for illustrative purpose, but, it will be apparent to those skilled in the art that under situation not, may make multiple different improvement, interpolation and substitute the present invention away from the scope of the invention described in the appended claim book and spirit.
Claims (11)
1. briquette with good initial strength, described briquette contains 100 weight part fine coal, 1-5 weight part unslaked lime and 7-15 weight part molasses.
2. the described briquette of claim 1, wherein said briquette have anti-crushing property that is not less than 70% and the powder ratio that is not more than 20%.
3. the described briquette of claim 1, wherein said fine coal contains the moisture content of 6-15 weight %.
4. the described briquette of claim 1, the particle size of wherein said unslaked lime is not more than 1mm, and the part that particle size is not more than 0.3mm in the unslaked lime is 50 weight %.
5. the application of each described briquette of claim 1～4 in the iron Preparation Method of smelting reduction.
6. one kind prepares the method with good initial strength briquette, and described method comprises the steps:
1-5 weight part unslaked lime is mixed with 100 weight part fine coal and this mixture of slaking;
7-15 weight part molasses are mixed with described slaking mixture and stir this mixture; With
The described stirred mixture of compressed moulding is to form a kind of briquette.
7. the described method of claim 6, wherein said fine coal contains 6-15 weight % moisture content.
8. the described method of claim 6, the particle size of wherein said unslaked lime is not more than 1mm, and the part that particle size is not more than 0.3mm in the unslaked lime is 50 weight %.
9. the described method of claim 6, wherein said maturation stage is carried out 2 minutes to 2 hours, thereby makes described unslaked lime be converted into white lime.
10. the described method of claim 6, wherein said whipping step carries out 2-50 minute, thereby makes described mixture have the cementation index of raising.
11. the described method of claim 6 does not wherein need extra heat drying step after the compressed moulding step.
Applications Claiming Priority (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR20000078779 | 2000-12-19 | ||
| KR2000/78779 | 2000-12-19 | ||
| KR1020010052328A KR100627469B1 (en) | 2000-12-19 | 2001-08-29 | Coal briquette having superior strength for smelting reduction iron making process and briquetting method thereof |
| KR2001/52328 | 2001-08-29 |
Related Child Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2004100686351A Division CN1309844C (en) | 2000-12-19 | 2001-12-12 | Coal briquette having superior strength and briquetting method thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1404524A CN1404524A (en) | 2003-03-19 |
| CN1173018C true CN1173018C (en) | 2004-10-27 |
Family
ID=26638647
Family Applications (2)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2004100686351A Expired - Fee Related CN1309844C (en) | 2000-12-19 | 2001-12-12 | Coal briquette having superior strength and briquetting method thereof |
| CNB018052215A Expired - Fee Related CN1173018C (en) | 2000-12-19 | 2001-12-12 | Coal briquette having superior strength and briquetting method thereof |
Family Applications Before (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2004100686351A Expired - Fee Related CN1309844C (en) | 2000-12-19 | 2001-12-12 | Coal briquette having superior strength and briquetting method thereof |
Country Status (4)
| Country | Link |
|---|---|
| CN (2) | CN1309844C (en) |
| RU (1) | RU2224007C1 (en) |
| TR (1) | TR200202004T1 (en) |
| WO (1) | WO2002050219A1 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109804052A (en) * | 2016-10-12 | 2019-05-24 | 株式会社Posco | Moulded coal preparation method and moulded coal preparation facilities |
Families Citing this family (18)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| AU773890B2 (en) * | 1999-10-21 | 2004-06-10 | Yarraboldy Briquette Company Pty Ltd | Preparation of briquettes having a low binder content |
| WO2004020555A1 (en) * | 2002-09-02 | 2004-03-11 | Posco | Coal briquettes for smelting reduction process, and method for manufacturing the same |
| KR20050077103A (en) * | 2004-01-26 | 2005-08-01 | 주식회사 포스코 | The apparatus for producing molten iron directly using coal with wide range of size and the method using the same |
| AU2005204297B8 (en) * | 2004-09-01 | 2010-07-29 | Yarraboldy Briquette Company Pty Ltd | A Method for Suppressing Sulphur Released During Combustion of Coal |
| CN101191088B (en) * | 2006-11-21 | 2014-10-01 | 宝钢集团有限公司 | Moulded coal and preparation method thereof |
| AT505227B1 (en) | 2007-05-09 | 2012-07-15 | Siemens Vai Metals Tech Gmbh | PROCESS FOR THE MANUFACTURE OF FORMINGS |
| AT507851B1 (en) | 2009-01-16 | 2017-10-15 | Primetals Technologies Austria GmbH | PROCESS FOR PREPARING PRESS LENDS CONTAINING COAL PARTICLES |
| AT510136B1 (en) * | 2010-07-12 | 2016-11-15 | Primetals Technologies Austria GmbH | PROCESS FOR PREPARING PRESS LENDS CONTAINING COAL PARTICLES |
| AT510135B1 (en) | 2010-07-12 | 2016-11-15 | Primetals Technologies Austria GmbH | PROCESS FOR PREPARING PRESS LENDS CONTAINING COAL PARTICLES |
| CN102746913A (en) * | 2011-04-21 | 2012-10-24 | 宝山钢铁股份有限公司 | Moulding method of moulded coal used for smelting-reduction ironmaking |
| RU2479623C1 (en) * | 2011-10-20 | 2013-04-20 | Федеральное государственное бюджетное образовательное учреждение высшего профессионального образования "Сибирский государственный индустриальный университет" | Method to produce oxide-fuel briquettes |
| WO2013152959A1 (en) | 2012-04-10 | 2013-10-17 | Siemens Vai Metals Technologies Gmbh | Process and apparatus for briquette production |
| EP2662458A1 (en) | 2012-05-08 | 2013-11-13 | Siemens VAI Metals Technologies GmbH | Method and device for reducing BTX development during the pyrolysis of carbon-based fuels |
| KR101418053B1 (en) * | 2012-12-21 | 2014-07-09 | 주식회사 포스코 | Coal briquettes and method for manufacturing the same |
| CN104232198A (en) * | 2013-06-20 | 2014-12-24 | 宝山钢铁股份有限公司 | Method and molasses water for preventing roller sticking phenomena of forming machine in process of producing coal briquettes by using waste molasses as well as equipment for producing coal briquettes |
| KR101595539B1 (en) * | 2013-12-26 | 2016-02-18 | 주식회사 포스코 | Coal briquettes and method for manufacturing the same |
| RU2629365C1 (en) * | 2016-07-12 | 2017-08-29 | федеральное государственное автономное образовательное учреждение высшего образования "Южный федеральный университет" | Fuel briquet production composition |
| CN108384597A (en) * | 2018-02-06 | 2018-08-10 | 武汉凯迪绿色能源开发运营有限公司 | Biomass recirculating fluidized bed boiler anti-coking additive and its preparation and application method |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DD250716A1 (en) * | 1986-07-03 | 1987-10-21 | Bkw Geiseltal Veb | BINDER TO INCREASE THE PRESSURE STRENGTH OF BRIKETTS |
| GB2227024B (en) * | 1989-01-12 | 1992-08-19 | Coal Ind | Coal briquetting process |
| GB2227023A (en) * | 1989-01-12 | 1990-07-18 | Coal Ind | Briquetting process |
| CN1101677A (en) * | 1993-10-13 | 1995-04-19 | 冶金工业部鞍山热能研究院 | Single Charging stock recipe for blast furnace iron-smelting and apparatus |
-
2001
- 2001-12-12 RU RU2002129219/04A patent/RU2224007C1/en not_active IP Right Cessation
- 2001-12-12 CN CNB2004100686351A patent/CN1309844C/en not_active Expired - Fee Related
- 2001-12-12 CN CNB018052215A patent/CN1173018C/en not_active Expired - Fee Related
- 2001-12-12 WO PCT/KR2001/002149 patent/WO2002050219A1/en active Application Filing
- 2001-12-12 TR TR2002/02004T patent/TR200202004T1/en unknown
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109804052A (en) * | 2016-10-12 | 2019-05-24 | 株式会社Posco | Moulded coal preparation method and moulded coal preparation facilities |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1603390A (en) | 2005-04-06 |
| WO2002050219A1 (en) | 2002-06-27 |
| CN1309844C (en) | 2007-04-11 |
| RU2002129219A (en) | 2004-02-27 |
| TR200202004T1 (en) | 2003-05-21 |
| CN1404524A (en) | 2003-03-19 |
| RU2224007C1 (en) | 2004-02-20 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN1173018C (en) | Coal briquette having superior strength and briquetting method thereof | |
| CN86107869A (en) | With the method for the material produce building slab that contains flying dust and made building slab | |
| CN1025749C (en) | Method for preparing pellet sintered ore | |
| CN1094419A (en) | Be used to prepare cementing compositions, the using method of said composition and thus obtained material group based on the novelty material group of fines | |
| CN1596293A (en) | Coal briquettes for smelting reduction process, and method for manufacturing the same | |
| CN1759928A (en) | A sort of dispersant and application | |
| CN1108719A (en) | Agent for injection of base | |
| CN1036661C (en) | Compound binding agent and process for production of briquet | |
| CN1552793A (en) | Pre-crosslinked granular plugging agent and its production | |
| KR100568337B1 (en) | Method of Briquettes having superior strength for smelting reduction iron making process | |
| CN1091132C (en) | Technological process of producing calcined petroleum coke in coke oven | |
| CN1314782C (en) | Profile coke for gasification using coke powder as raw material and its production method | |
| CN1033157C (en) | Granular potassium sulfate and process for producing the same | |
| CN1431275A (en) | Multi-functional macromolecule composite material for sand-fixation vegetation and its preparing method | |
| CN1131136C (en) | Mfg. method of phenolic resin shaping material containing little or no free ammonia | |
| JPH1112624A (en) | Formation of reduced iron-producing raw material | |
| CN1484622A (en) | Impact modifier for thermoplastic resin and resin composition containing the same | |
| KR100905581B1 (en) | Coal Briquettes For Iron and Steel Making Process, Method Of Manufacturing Thereof | |
| CN1266072C (en) | Brick blended high content flyash and mfg. method thereof | |
| CN1105344A (en) | Method for making non-clinker cement by wet-milling flyash and product thereof | |
| CN1851012A (en) | Sintering heat gradient optimizing method for iron and steel metallurgical industry | |
| KR100627469B1 (en) | Coal briquette having superior strength for smelting reduction iron making process and briquetting method thereof | |
| CN109054685A (en) | Coke powder adhesive, suitable for the focal sphere and preparation method thereof of closed calcium carbide furnace production, closed calcium carbide furnace calcium carbide production method | |
| CN1786341A (en) | Auxiliary dispersing agent for preparing gypsum plaster with high solid content | |
| CN1760346A (en) | A method for suppressing sulphur released during combustion of coal |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20041027 Termination date: 20181212 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |