CN117758044A - Adhesive for high-temperature-resistant cold bonded pellets, cold bonded pellets and preparation method of cold bonded pellets - Google Patents
Adhesive for high-temperature-resistant cold bonded pellets, cold bonded pellets and preparation method of cold bonded pellets Download PDFInfo
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- CN117758044A CN117758044A CN202311789559.2A CN202311789559A CN117758044A CN 117758044 A CN117758044 A CN 117758044A CN 202311789559 A CN202311789559 A CN 202311789559A CN 117758044 A CN117758044 A CN 117758044A
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- 239000008188 pellet Substances 0.000 title claims abstract description 154
- 239000000853 adhesive Substances 0.000 title claims abstract description 31
- 230000001070 adhesive effect Effects 0.000 title claims abstract description 31
- 238000002360 preparation method Methods 0.000 title abstract description 17
- 229920002472 Starch Polymers 0.000 claims abstract description 118
- 239000008107 starch Substances 0.000 claims abstract description 118
- 235000019698 starch Nutrition 0.000 claims abstract description 118
- 229920001807 Urea-formaldehyde Polymers 0.000 claims abstract description 33
- GZCGUPFRVQAUEE-SLPGGIOYSA-N aldehydo-D-glucose Chemical compound OC[C@@H](O)[C@@H](O)[C@H](O)[C@@H](O)C=O GZCGUPFRVQAUEE-SLPGGIOYSA-N 0.000 claims abstract description 31
- RMAQACBXLXPBSY-UHFFFAOYSA-N silicic acid Chemical compound O[Si](O)(O)O RMAQACBXLXPBSY-UHFFFAOYSA-N 0.000 claims abstract description 27
- 239000000395 magnesium oxide Substances 0.000 claims abstract description 23
- CPLXHLVBOLITMK-UHFFFAOYSA-N magnesium oxide Inorganic materials [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 claims abstract description 23
- AXZKOIWUVFPNLO-UHFFFAOYSA-N magnesium;oxygen(2-) Chemical compound [O-2].[Mg+2] AXZKOIWUVFPNLO-UHFFFAOYSA-N 0.000 claims abstract description 23
- 239000003381 stabilizer Substances 0.000 claims abstract description 18
- 240000003183 Manihot esculenta Species 0.000 claims description 62
- 235000016735 Manihot esculenta subsp esculenta Nutrition 0.000 claims description 62
- 238000003756 stirring Methods 0.000 claims description 52
- 239000000463 material Substances 0.000 claims description 44
- 239000011230 binding agent Substances 0.000 claims description 32
- 238000003825 pressing Methods 0.000 claims description 30
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 27
- 239000002002 slurry Substances 0.000 claims description 24
- 239000000843 powder Substances 0.000 claims description 23
- NLXLAEXVIDQMFP-UHFFFAOYSA-N Ammonia chloride Chemical compound [NH4+].[Cl-] NLXLAEXVIDQMFP-UHFFFAOYSA-N 0.000 claims description 20
- UIIMBOGNXHQVGW-DEQYMQKBSA-M Sodium bicarbonate-14C Chemical compound [Na+].O[14C]([O-])=O UIIMBOGNXHQVGW-DEQYMQKBSA-M 0.000 claims description 14
- 238000001816 cooling Methods 0.000 claims description 12
- 239000001866 hydroxypropyl methyl cellulose Substances 0.000 claims description 12
- 229920003088 hydroxypropyl methyl cellulose Polymers 0.000 claims description 12
- 235000010979 hydroxypropyl methyl cellulose Nutrition 0.000 claims description 12
- UFVKGYZPFZQRLF-UHFFFAOYSA-N hydroxypropyl methyl cellulose Chemical compound OC1C(O)C(OC)OC(CO)C1OC1C(O)C(O)C(OC2C(C(O)C(OC3C(C(O)C(O)C(CO)O3)O)C(CO)O2)O)C(CO)O1 UFVKGYZPFZQRLF-UHFFFAOYSA-N 0.000 claims description 12
- 229920002401 polyacrylamide Polymers 0.000 claims description 12
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 12
- 229910052810 boron oxide Inorganic materials 0.000 claims description 11
- JKWMSGQKBLHBQQ-UHFFFAOYSA-N diboron trioxide Chemical compound O=BOB=O JKWMSGQKBLHBQQ-UHFFFAOYSA-N 0.000 claims description 11
- 235000019270 ammonium chloride Nutrition 0.000 claims description 10
- 240000008042 Zea mays Species 0.000 claims description 9
- 235000005824 Zea mays ssp. parviglumis Nutrition 0.000 claims description 9
- 235000002017 Zea mays subsp mays Nutrition 0.000 claims description 9
- 235000005822 corn Nutrition 0.000 claims description 9
- 238000000034 method Methods 0.000 claims description 7
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N Iron oxide Chemical compound [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 claims 4
- 238000010298 pulverizing process Methods 0.000 abstract description 7
- UIIMBOGNXHQVGW-UHFFFAOYSA-M Sodium bicarbonate Chemical compound [Na+].OC([O-])=O UIIMBOGNXHQVGW-UHFFFAOYSA-M 0.000 description 16
- 229910052742 iron Inorganic materials 0.000 description 10
- 239000000203 mixture Substances 0.000 description 8
- 229910000030 sodium bicarbonate Inorganic materials 0.000 description 8
- 235000017557 sodium bicarbonate Nutrition 0.000 description 8
- 239000002245 particle Substances 0.000 description 6
- 229920002261 Corn starch Polymers 0.000 description 5
- 239000008120 corn starch Substances 0.000 description 5
- 230000000052 comparative effect Effects 0.000 description 4
- 239000012790 adhesive layer Substances 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000001035 drying Methods 0.000 description 2
- 239000000428 dust Substances 0.000 description 2
- 230000003068 static effect Effects 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical compound C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 239000012141 concentrate Substances 0.000 description 1
- 238000004090 dissolution Methods 0.000 description 1
- 238000013467 fragmentation Methods 0.000 description 1
- 238000006062 fragmentation reaction Methods 0.000 description 1
- 239000010410 layer Substances 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000011056 performance test Methods 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 238000011946 reduction process Methods 0.000 description 1
- 229920002545 silicone oil Polymers 0.000 description 1
- 239000002893 slag Substances 0.000 description 1
- 239000011734 sodium Substances 0.000 description 1
- 229910052708 sodium Inorganic materials 0.000 description 1
- 239000007790 solid phase Substances 0.000 description 1
- 238000007711 solidification Methods 0.000 description 1
- 230000008023 solidification Effects 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
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- Adhesives Or Adhesive Processes (AREA)
Abstract
The invention provides an adhesive for high Wen Lenggu-resistant pellets, a cold bonded pellet and a preparation method thereof, and relates to the field of adhesives. The adhesive comprises the following components in parts by weight: 0.7-2.5 parts of gelatinized starch, 1.5-4 parts of magnesium oxide, 0.5-2 parts of urea-formaldehyde resin, 0.7-2.5 parts of silica sol and 0.02-0.6 part of stabilizer. The adhesive is added with gelatinized starch, magnesium oxide, urea-formaldehyde resin and silica sol, so that the strength of the cured pellets can be increased, the pellets have excellent compressive strength and heat resistance, the expansion index of the pellets is improved, and the compressive strength of the pellets in a high-temperature state is increased, thereby solving the problem that the adhesive in the prior art cannot meet the requirements of the pellets on the compressive strength, the pulverization at low temperature and the high-temperature expansion coefficient in high temperature.
Description
Technical Field
The invention relates to the field of adhesives, in particular to an adhesive for high Wen Lenggu-resistant pellets, a cold-bonded pellet and a preparation method thereof.
Background
The cold bonded pellets are obtained by mixing raw materials such as fine ore, metallurgical dust mud, dust removal ash, steel slag selection, sintered pellet return and the like with a certain amount of adhesive, pressing the mixed materials into pellets with certain shape, size and density through a die under a certain pressure, and drying the pellets. The obtained cold bonded pellets after pressing generally have enough strength and proper metallurgical performance and can be directly smelted in a furnace.
The binders generally used for the cold bonded pellets are classified into three main categories of organic binders, inorganic binders and organic-inorganic composite binders. The organic adhesive is starch, sodium humate, papermaking waste liquid, etc. and has high cold adhesion strength at normal temperature.
From the foregoing, it is known that one of the cores of the cold bonded pellets is an organic binder, and therefore, the organic binder must have the following characteristics:
1. the adhesive is required to have high adhesive index at normal temperature, so that the normal-temperature cold strength of the cold bonded pellets is more than or equal to 1500N;
2. the addition proportion of the adhesive is low, and the influence on the iron element in the cooled agglomerated pellet is small;
3. the binder does not contain elements harmful to emission standards;
4. the adhesive is used to ensure that the pellets have corresponding strength in the low temperature 500 ℃, the medium temperature region 600-900 ℃ and the high temperature region 900-1200 ℃ and cannot expand, burst and break.
However, the conventional organic binder cannot meet the above requirements, and thus, there is a need to develop a binder for high temperature resistant cold bonded pellets which can meet the use requirements.
Disclosure of Invention
In order to solve the problems, the invention provides a binder for high Wen Lenggu resistant pellets, a cold bonded pellet and a preparation method thereof, so as to solve the problems or at least partially solve the problems.
In order to achieve the aim, in a first aspect, the invention provides a high Wen Lenggu-resistant adhesive for pellets, which comprises the following components in parts by weight:
0.7-2.5 parts of gelatinized starch, 1.5-4 parts of magnesium oxide, 0.5-2 parts of urea-formaldehyde resin, 0.7-2.5 parts of silica sol and 0.02-0.6 part of stabilizer.
In one embodiment, the gelatinized starch is tapioca gelatinized starch or corn gelatinized starch, and the gelatinization temperature of the gelatinized starch is 190-220 ℃.
In one embodiment, the urea-formaldehyde resin has a viscosity of 200000-220000 mpa-s.
In one embodiment, the urea-formaldehyde resin is a water-soluble urea-formaldehyde resin.
In one embodiment, the stabilizer is at least one of boron oxide, sodium bicarbonate and ammonium chloride.
In a second aspect, the invention provides a cooled agglomerated pellet, which comprises red mud powder and the binder, wherein the mass ratio of the binder to the red mud powder is (5-10): 100.
in a third aspect, the present invention provides a method for preparing a cooled agglomerated pellet, for preparing the cooled agglomerated pellet, comprising the steps of:
adding 100 parts of red mud powder, 0.7-2.5 parts of gelatinized starch, 1.5-4 parts of magnesium oxide, 0.5-2 parts of urea-formaldehyde resin, 0.7-2.5 parts of silica sol and 0.02-0.6 part of stabilizer into stirring equipment, and uniformly stirring to form a mixed material;
pressing the mixed material by a ball pressing machine to obtain pellets;
and after the pellets are dried, obtaining the cold bonded pellets.
In a fourth aspect, the invention provides a cooled agglomerated pellet, comprising iron powder and the binder, wherein the mass ratio of the binder to the iron powder is (5-10): 100.
in a fifth aspect, the present invention provides a method for preparing a cooled agglomerated pellet, for preparing the cooled agglomerated pellet, comprising the steps of:
adding 100 parts of fine iron powder, 0.7-2.5 parts of gelatinized starch, 1.5-4 parts of magnesium oxide, 0.5-2 parts of urea-formaldehyde resin, 0.7-2.5 parts of silica sol and 0.02-0.6 part of stabilizer into stirring equipment, and uniformly stirring to form a mixed material;
pressing the mixed material by a ball pressing machine to obtain pellets;
and after the pellets are dried, obtaining the cold bonded pellets.
In one embodiment, the gelatinized starch is made by the steps of:
adding 100 parts of starch, 11-12 parts of water, 0.7-2.5 parts of sodium bicarbonate, 0.1-0.3 part of polyacrylamide and 0.5-2 parts of hydroxypropyl methyl cellulose into stirring equipment, and uniformly stirring to form starch slurry;
gelatinizing the starch slurry at 190-220 ℃;
cooling the gelatinized starch paste to obtain the gelatinized starch.
Compared with the prior art, the invention has one of the following advantages:
by adding gelatinized starch, magnesium oxide, urea-formaldehyde resin and silica sol into the adhesive, the strength of the cured pellets can be increased, so that the pellets have excellent compressive strength and heat resistance, the expansion index of the pellets is improved, and the compressive strength of the pellets in a high-temperature state is increased, thereby solving the problem that the adhesive in the prior art cannot meet the high requirements of the pellets on strength and pulverization expansion coefficient in high temperature.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the technical solutions of the present invention will be clearly and completely described in the following in connection with specific embodiments. It will be apparent that the described embodiments are only some, but not all, embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
In a first aspect, the adhesive for high temperature resistant cold bonded pellets provided in this embodiment includes the following components in parts by weight:
0.7-2.5 parts (preferably 1.5-2 parts) of gelatinized starch, 1.5-4 parts (preferably 2-3 parts) of magnesium oxide, 0.5-2 parts (preferably 1-1.5 parts) of urea-formaldehyde resin, 0.7-2.5 parts (preferably 1-2 parts) of silica sol and 0.02-0.6 parts (preferably 0.05-0.5 part) of stabilizer.
In this example, the gelatinized starch is tapioca gelatinized starch or corn gelatinized starch, and the gelatinization temperature of the gelatinized starch is 190-220 ℃. Among these, the gelatinized starch is preferably tapioca gelatinized starch.
The gelatinized starch is selected because of its good solubility, good adhesion after dissolution, and strong adhesion to various substances, increasing the tackiness of the adhesive. When the adhesive containing gelatinized starch is used for preparing the pellets, the adhesive can be wrapped on the surfaces of material particles, a layer of film with bonding effect is formed on the surfaces of the material particles, gaps among the particles are filled, initial forming of the pellets is promoted, and after drying, solid-phase bonding bridge bonding material particles can be formed, so that the pellets have excellent compressive strength.
Preferably, the gelatinized starch is tapioca gelatinized starch. The tapioca gelatinized starch is preferable because it also allows the binder to have a certain elasticity relative to the corn gelatinized starch, allows the binder to have viscoelasticity, and improves the falling strength of the pellets.
In this example, magnesium oxide is an inorganic binder that can be dissolved rapidly, changing the porosity, surface electrical properties and specific surface area of the material. When the adhesive containing the paste magnesium oxide is used for preparing pellets, capillary holes in the pellets can be blocked, a skeleton effect is achieved after the pellets are formed, and the compressive strength and the reduction softening temperature of finished pellets can be effectively improved.
In this example, the viscosity of the urea-formaldehyde resin is 200000-220000 mpa.s.
Preferably, the urea-formaldehyde resin is water-soluble urea-formaldehyde resin with high viscosity characteristic. When the adhesive containing the water-soluble urea resin is used for preparing the pellets, the adhesive can form a net structure with materials, so that the pellets have excellent heat resistance, the low-temperature pulverization rate of the pellets is improved, the strength is high after solidification, and the adhesive layer is brittle.
In the embodiment, the silica sol is a high-temperature-resistant adhesive and has the characteristics of strong high-temperature resistance, strong stability, quick curing performance and the like. When the adhesive containing silica sol is used for preparing the pellets, the pellets have excellent heat resistance, so that the expansion index of the pellets is improved, and the high-temperature compressive strength of the pellets is improved.
Alternatively, the silica sol is an organosilicon sol or a silicone oil-based silica sol.
Preferably, the silica sol is an organosilicon sol.
In this example, the stabilizer has a certain high temperature chemical stability and lubricity. When the adhesive containing the stabilizer is used for preparing pellets, the brittleness of the urea-formaldehyde resin adhesive layer can be improved, the surface adhesive force of the adhesive on material particles is stabilized in the low-temperature reduction process, and the fragmentation and pulverization are reduced.
Optionally, the stabilizer is at least one of boron oxide, sodium bicarbonate and ammonium chloride.
Preferably, when the stabilizer is boron oxide and sodium bicarbonate, the ratio of the two is (0-20): (5-10).
Preferably, when the stabilizer is boron oxide, sodium bicarbonate and ammonium chloride, the ratio of the three is (0-20): (5-10): (3-5).
In a second aspect, the cooled agglomerated pellet provided in this embodiment includes red mud powder and the binder, where the mass ratio of the binder to the red mud powder is (5-10): 100.
preferably, the mass ratio of the binder to the red mud powder is (6-8): 100.
in a third aspect, the preparation method of the cooled agglomerated pellet provided in the embodiment is used for preparing the cooled agglomerated pellet composed of the binder and the red mud powder, and the preparation method includes the following steps:
adding 100 parts of red mud powder, 0.7-2.5 parts of gelatinized starch, 1.5-4 parts of magnesium oxide, 0.5-2 parts of urea-formaldehyde resin, 0.7-2.5 parts of silica sol and 0.02-0.6 part of stabilizer into stirring equipment, and uniformly stirring to form a mixed material;
pressing the mixed material by a ball pressing machine to obtain pellets;
and after the pellets are dried, obtaining the cold bonded pellets.
Specifically, the pellets are pressed into spheres under a pressure of 50-100 tons, and the diameter of the pellets is 30-50 mm.
Further, the gelatinized starch is tapioca gelatinized starch or corn gelatinized starch.
Still further, tapioca gelatinized starch is made by the steps of:
adding 100 parts of starch, 11-12 parts of water, 0.7-2.5 parts of sodium bicarbonate, 0.1-0.3 part of polyacrylamide and 0.5-2 parts of hydroxypropyl methyl cellulose into stirring equipment, and uniformly stirring to form starch slurry;
gelatinizing the starch slurry at 190-220 ℃;
and cooling the gelatinized starch paste to obtain gelatinized starch.
Example 1
The preparation method of the cold bonded pellets provided by the embodiment comprises the following steps:
adding 100 parts of red mud powder, 1.5 parts of tapioca gelatinized starch, 2 parts of magnesium oxide, 1.5 parts of water-soluble urea-formaldehyde resin, 2 parts of silica sol and 0.2 part of boron oxide into stirring equipment, and stirring for 5 minutes to uniformly mix the materials to form a mixed material;
pressing the mixed material by a ball pressing machine to obtain pellets;
and after the pellets are dried, obtaining the cold bonded pellets.
Preferably, the pellets are pressed into spheres under a pressure of 50 tons, the diameter of the pellets being 30mm.
Further, tapioca gelatinized starch is prepared by the steps of:
adding 100 parts of tapioca starch, 11 parts of water, 0.7 part of sodium bicarbonate, 0.1 part of polyacrylamide and 0.5 part of hydroxypropyl methyl cellulose into stirring equipment, and forming tapioca starch slurry after stirring uniformly;
gelatinizing the cassava starch slurry, wherein the gelatinization temperature is 190 ℃;
and cooling the gelatinized tapioca starch paste to obtain tapioca gelatinized starch.
Example two
The preparation method of the cold bonded pellets provided by the embodiment comprises the following steps:
adding 100 parts of red mud powder, 1.5 parts of tapioca gelatinized starch, 2 parts of magnesium oxide, 1.5 parts of water-soluble urea-formaldehyde resin, 2 parts of silica sol and 0.05 part of sodium bicarbonate into stirring equipment, and stirring for 5 minutes to uniformly mix the materials to form a mixed material;
pressing the mixed material by a ball pressing machine to obtain pellets;
and after the pellets are dried, obtaining the cold bonded pellets.
Preferably, the pellets are pressed into spheres under a pressure of 70 tons, the diameter of the pellets being 40mm.
Further, tapioca gelatinized starch is prepared by the steps of:
adding 100 parts of tapioca starch, 11.5 parts of water, 1.2 parts of sodium bicarbonate, 0.15 part of polyacrylamide and 1 part of hydroxypropyl methyl cellulose into stirring equipment, and forming tapioca starch slurry after stirring uniformly;
gelatinizing the cassava starch slurry, wherein the gelatinization temperature is 190 ℃;
and cooling the gelatinized tapioca starch paste to obtain tapioca gelatinized starch.
Example III
The preparation method of the cold bonded pellets provided by the embodiment comprises the following steps:
adding 100 parts of red mud powder, 1.5 parts of tapioca gelatinized starch, 2 parts of magnesium oxide, 1.5 parts of water-soluble urea-formaldehyde resin, 2 parts of silica sol and 0.5 part of ammonium chloride into stirring equipment, and stirring for 5 minutes to uniformly mix the materials to form a mixed material;
pressing the mixed material by a ball pressing machine to obtain pellets;
and after the pellets are dried, obtaining the cold bonded pellets.
Preferably, the pellets are pressed into spheres under a pressure of 60 tons, the diameter of the pellets being 40mm.
Further, tapioca gelatinized starch is prepared by the steps of:
adding 100 parts of tapioca starch, 11.5 parts of water, 1.5 parts of sodium bicarbonate, 0.2 part of polyacrylamide and 1.5 parts of hydroxypropyl methyl cellulose into stirring equipment, and forming tapioca starch slurry after stirring uniformly;
gelatinizing the cassava starch slurry, wherein the gelatinization temperature is 200 ℃;
and cooling the gelatinized tapioca starch paste to obtain tapioca gelatinized starch.
In a fourth aspect, the cooled agglomerated pellet provided in this embodiment includes red mud powder and the binder, where the mass ratio of the binder to the iron concentrate powder is (5-10): 100.
preferably, the mass ratio of the binder to the fine iron powder is (6-8): 100.
in a fifth aspect, the preparation method of the cooled agglomerated pellet provided in the embodiment is used for preparing the cooled agglomerated pellet, and includes the following steps:
adding 100 parts of fine iron powder, 0.7-2.5 parts of gelatinized starch, 1.5-4 parts of magnesium oxide, 0.5-2 parts of urea-formaldehyde resin, 0.7-2.5 parts of silica sol and 0.02-0.6 part of stabilizer into stirring equipment, and uniformly stirring to form a mixed material;
pressing the mixed material by a ball pressing machine to obtain pellets;
and after the pellets are dried, obtaining the cold bonded pellets.
Specifically, the pellets are pressed into spheres under a pressure of 50-100 tons, and the diameter of the pellets is 30-50 mm.
Further, the gelatinized starch is tapioca gelatinized starch or corn gelatinized starch.
Still further, tapioca gelatinized starch is made by the steps of:
adding 100 parts of starch, 11-12 parts of water, 0.7-2.5 parts of sodium bicarbonate, 0.1-0.3 part of polyacrylamide and 0.5-2 parts of hydroxypropyl methyl cellulose into stirring equipment, and uniformly stirring to form starch slurry;
gelatinizing the starch slurry at 190-220 ℃;
and cooling the gelatinized starch paste to obtain gelatinized starch.
Example IV
The preparation method of the cold bonded pellets provided by the embodiment comprises the following steps:
adding 100 parts of iron fine powder, 1.5 parts of tapioca gelatinized starch, 2 parts of magnesium oxide, 1.5 parts of water-soluble urea-formaldehyde resin, 2 parts of silica sol, 0.2 part of boron oxide and 0.05 part of ammonium chloride into stirring equipment, and stirring for 5 minutes to uniformly mix the materials to form a mixed material;
pressing the mixed material by a ball pressing machine to obtain pellets;
and after the pellets are dried, obtaining the cold bonded pellets.
Preferably, the pellets are pressed into spheres under a pressure of 80 tons, the diameter of the pellets being 40mm.
Further, tapioca gelatinized starch is prepared by the steps of:
adding 100 parts of tapioca starch, 11 parts of water, 1.5 parts of sodium bicarbonate, 0.3 part of polyacrylamide and 1.8 parts of hydroxypropyl methyl cellulose into stirring equipment, and forming tapioca starch slurry after stirring uniformly;
gelatinizing the cassava starch slurry, wherein the gelatinization temperature is 190 ℃;
and cooling the gelatinized tapioca starch paste to obtain tapioca gelatinized starch.
Example five
The preparation method of the cold bonded pellets provided by the embodiment comprises the following steps:
adding 100 parts of iron fine powder, 1.5 parts of tapioca gelatinized starch, 3 parts of magnesium oxide, 1 part of water-soluble urea-formaldehyde resin, 2 parts of silica sol, 0.2 part of boron oxide, 0.05 part of sodium bicarbonate and 0.5 part of ammonium chloride into stirring equipment, and stirring for 5 minutes to uniformly mix the materials to form a mixed material;
pressing the mixed material by a ball pressing machine to obtain pellets;
and after the pellets are dried, obtaining the cold bonded pellets.
Preferably, the pellets are pressed into spheres under a pressure of 90 tons, the diameter of the pellets being 40mm.
Further, tapioca gelatinized starch is prepared by the steps of:
adding 100 parts of tapioca starch, 12 parts of water, 2 parts of sodium bicarbonate, 0.2 part of polyacrylamide and 1.5 parts of hydroxypropyl methyl cellulose into stirring equipment, and forming tapioca starch slurry after stirring uniformly;
gelatinizing the cassava starch slurry, wherein the gelatinization temperature is 190 ℃;
and cooling the gelatinized tapioca starch paste to obtain tapioca gelatinized starch.
Example six
The preparation method of the cold bonded pellets provided by the embodiment comprises the following steps:
adding 100 parts of iron fine powder, 1.5 parts of tapioca gelatinized starch, 2.5 parts of magnesium oxide, 2 parts of water-soluble urea-formaldehyde resin, 2 parts of silica sol, 0.2 part of boron oxide, 0.05 part of sodium bicarbonate and 0.5 part of ammonium chloride into stirring equipment, and stirring for 5 minutes to uniformly mix the materials to form a mixed material;
pressing the mixed material by a ball pressing machine to obtain pellets;
and after the pellets are dried, obtaining the cold bonded pellets.
Preferably, the pellets are pressed into spheres under a pressure of 100 tons and the diameter of the pellets is 50mm.
Further, tapioca gelatinized starch is prepared by the steps of:
adding 100 parts of tapioca starch, 11.8 parts of water, 1.5 parts of sodium bicarbonate, 0.2 part of polyacrylamide and 1.2 parts of hydroxypropyl methyl cellulose into stirring equipment, and forming tapioca starch slurry after stirring uniformly;
gelatinizing the cassava starch slurry, wherein the gelatinization temperature is 210 ℃;
and cooling the gelatinized tapioca starch paste to obtain tapioca gelatinized starch.
Example seven
The preparation method of the cold bonded pellets provided by the embodiment comprises the following steps:
adding 100 parts of iron fine powder, 1.5 parts of tapioca gelatinized starch, 2.5 parts of magnesium oxide, 1.5 parts of water-soluble urea-formaldehyde resin, 3 parts of silica sol, 0.2 part of boron oxide, 0.05 part of sodium bicarbonate and 0.5 part of ammonium chloride into stirring equipment, and stirring for 5 minutes to uniformly mix the materials to form a mixed material;
pressing the mixed material by a ball pressing machine to obtain pellets;
and after the pellets are dried, obtaining the cold bonded pellets.
Preferably, the pellets are pressed into spheres under a pressure of 100 tons and the diameter of the pellets is 50mm.
Further, tapioca gelatinized starch is prepared by the steps of:
adding 100 parts of tapioca starch, 11.8 parts of water, 2 parts of sodium bicarbonate, 0.3 part of polyacrylamide and 1.8 parts of hydroxypropyl methyl cellulose into stirring equipment, and forming tapioca starch slurry after stirring uniformly;
gelatinizing the cassava starch slurry, wherein the gelatinization temperature is 220 ℃;
and cooling the gelatinized tapioca starch paste to obtain tapioca gelatinized starch.
Comparative example one
The preparation method of the cold bonded pellets provided by the embodiment comprises the following steps:
adding 100 parts of iron fine powder, 1.5 parts of corn gelatinized starch, 2.5 parts of magnesium oxide, 2 parts of water-soluble urea-formaldehyde resin, 2 parts of silica sol, 0.2 part of boron oxide, 0.05 part of sodium bicarbonate and 0.5 part of ammonium chloride into stirring equipment, and stirring for 5 minutes to uniformly mix the materials to form a mixed material;
pressing the mixed material by a ball pressing machine to obtain pellets;
and after the pellets are dried, obtaining the cold bonded pellets.
Preferably, the pellets are pressed into spheres under a pressure of 100 tons and the diameter of the pellets is 50mm.
Further, the corn gelatinized starch is prepared by the steps of:
adding 100 parts of corn starch, 11.8 parts of water, 1.5 parts of sodium bicarbonate, 0.2 part of polyacrylamide and 1.2 parts of hydroxypropyl methyl cellulose into stirring equipment, and forming corn starch slurry after stirring uniformly;
gelatinizing the corn starch slurry at 210 ℃;
cooling the gelatinized corn starch paste to obtain the corn gelatinized starch.
Table 1 shows the performance test results of the cooled agglomerated pellets of examples one to seven and comparative example one:
TABLE 1
The multi-batch sintering-free cooled agglomerated pellets obtained in examples one to seven and comparative example one were tested according to the following criteria:
the mechanical compressive strength is tested according to GB/T14201-2018 'determination of compressive strength of iron pellets for blast furnace and direct reduction';
the drum index (RDI+6.3) and the low-temperature reduction pulverization index (RDI+3.15) were tested according to GB/T13242-2017 method for static reduction of iron ore after low-temperature pulverization test using a cold drum.
The test is carried out according to GBT132402018 method for static reduction of iron ore after expansion coefficient test of iron ore.
In addition, in comparative example 1, corn starch was used instead of tapioca starch, and after gelatinization treatment, the mechanical strength and the drum index range of the pellets obtained were substantially the same as those of examples one to seven, and the low-temperature reduction pulverization index and the expansion coefficient were hardly affected.
In the preparation method of the cold-bonded pellets described in the first to seventh embodiments, the tapioca gelatinized starch has a decisive effect on the formation of the pellets, and the tapioca gelatinized starch, the water-soluble urea-formaldehyde resin and the material particles are mutually crosslinked to form a net structure together, so that the compressive strength of the finished pellets is further improved, and the guarantee is provided for the pellets to smoothly enter the furnace; magnesium oxide plays an important role in the compression strength of finished pellets and the low-temperature reduction stage after the pellets are charged into a furnace; the silica sol plays a role in high-temperature strength at a high-temperature link part in the furnace, and the stabilizer improves brittleness of the urea-formaldehyde resin and silica sol adhesive layer to a certain extent, so that pellets are maintained not to burst and pulverize in the furnace.
The foregoing description of the preferred embodiment of the invention is merely illustrative of the invention and is not intended to be limiting. It will be appreciated by persons skilled in the art that many variations, modifications, and even equivalents may be made thereto without departing from the spirit and scope of the invention as defined in the appended claims.
Claims (10)
1. The high Wen Lenggu-resistant adhesive for the pellets is characterized by comprising the following components in parts by weight:
0.7-2.5 parts of gelatinized starch, 1.5-4 parts of magnesium oxide, 0.5-2 parts of urea-formaldehyde resin, 0.7-2.5 parts of silica sol and 0.02-0.6 part of stabilizer.
2. The binder for cold-high temperature resistant cold-bonded pellets according to claim 1, wherein the gelatinized starch is tapioca gelatinized starch or corn gelatinized starch, and the gelatinization temperature of the gelatinized starch is 190-220 ℃.
3. The binder for high temperature resistant cold bonded pellets according to claim 1, wherein the urea resin has a viscosity of 200000 to 220000 mpa.s.
4. The binder for high temperature resistant cold bonded pellets according to claim 3, wherein the urea-formaldehyde resin is a water-soluble urea-formaldehyde resin.
5. The binder for high temperature resistant cold bonded pellets according to claim 1, wherein the stabilizer is at least one of boron oxide, sodium bicarbonate, and ammonium chloride.
6. A cooled agglomerated pellet, characterized by comprising red mud powder and the binder of any one of claims 1 to 5, the mass ratio of the binder to the red mud powder being (5-10): 100.
7. a method for preparing the cooled agglomerated pellet of claim 6, comprising the steps of:
adding 100 parts of red mud powder, 0.7-2.5 parts of gelatinized starch, 1.5-4 parts of magnesium oxide, 0.5-2 parts of urea-formaldehyde resin, 0.7-2.5 parts of silica sol and 0.02-0.6 part of stabilizer into stirring equipment, and uniformly stirring to form a mixed material;
pressing the mixed material by a ball pressing machine to obtain pellets;
and after the pellets are dried, obtaining the cold bonded pellets.
8. A cooled agglomerated pellet comprising iron oxide powder and the binder of any one of claims 1 to 5, the mass ratio of the binder to the iron oxide powder being (5-10): 100.
9. a method for preparing the cooled agglomerated pellet of claim 8, comprising the steps of:
adding 100 parts of fine iron powder, 0.7-2.5 parts of gelatinized starch, 1.5-4 parts of magnesium oxide, 0.5-2 parts of urea-formaldehyde resin, 0.7-2.5 parts of silica sol and 0.02-0.6 part of stabilizer into stirring equipment, and uniformly stirring to form a mixed material;
pressing the mixed material by a ball pressing machine to obtain pellets;
and after the pellets are dried, obtaining the cold bonded pellets.
10. The method of preparing cooled agglomerated pellets according to claim 7 or 9, characterized in that the gelatinized starch is prepared by the steps of:
adding 100 parts of starch, 11-12 parts of water, 0.7-2.5 parts of sodium bicarbonate, 0.1-0.3 part of polyacrylamide and 0.5-2 parts of hydroxypropyl methyl cellulose into stirring equipment, and uniformly stirring to form starch slurry;
gelatinizing the starch slurry at 190-220 ℃;
cooling the gelatinized starch paste to obtain the gelatinized starch.
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