WO2000064573A1 - Method of making pellets from aluminosilicate raw materials - Google Patents

Method of making pellets from aluminosilicate raw materials Download PDF

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Publication number
WO2000064573A1
WO2000064573A1 PCT/RU1999/000138 RU9900138W WO0064573A1 WO 2000064573 A1 WO2000064573 A1 WO 2000064573A1 RU 9900138 W RU9900138 W RU 9900138W WO 0064573 A1 WO0064573 A1 WO 0064573A1
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WIPO (PCT)
Prior art keywords
raw materials
pellets
rpm
rotational speed
moistener
Prior art date
Application number
PCT/RU1999/000138
Other languages
French (fr)
Inventor
Vladimir Anatolievich Mozhzherin
Boris Abramovich Simanovsky
Oleg Mikhailovich Rozanov
Viktor Pavlovich Migal
Vyacheslav Yakovlevich Sakulin
Alexandr Nikolaevich Novikov
Galina Nikolaevna Salagina
Evgeny Arkadievich Shtern
Original Assignee
Otkrytoe Aktsionernoe Obschestvo 'borovichsky Kombinat Ogneuporov'
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Publication date
Priority to RU98101587A priority Critical patent/RU2129987C1/en
Application filed by Otkrytoe Aktsionernoe Obschestvo 'borovichsky Kombinat Ogneuporov' filed Critical Otkrytoe Aktsionernoe Obschestvo 'borovichsky Kombinat Ogneuporov'
Priority to AU10866/00A priority patent/AU1086600A/en
Priority to PCT/RU1999/000138 priority patent/WO2000064573A1/en
Publication of WO2000064573A1 publication Critical patent/WO2000064573A1/en

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J2/00—Processes or devices for granulating materials, e.g. fertilisers in general; Rendering particulate materials free flowing in general, e.g. making them hydrophobic
    • B01J2/10—Processes or devices for granulating materials, e.g. fertilisers in general; Rendering particulate materials free flowing in general, e.g. making them hydrophobic in stationary drums or troughs, provided with kneading or mixing appliances

Definitions

  • the present invention relates generally to the processing of aluminosilicate raw materials ⁇ hen fabricating granulated materials intended to be used different branches of industry employing pellets, for example as propping agents m oil recovery hydraulically fracturing the oil-bea ⁇ ng bed.
  • a drawback of this known method is associated with mixing of the blend and formation of the pellets at a time of supplying water at a constant mixer speed.
  • Such pelletizmg conditions fail to provide a uniform compaction of the moistened mass and, accordingly, a density-uniform structure of the calcined granules, nor the> provide a maximum output of predetermined fraction of pellets.
  • the use of corn starch as a binding component requires that this component and v. ater be supplied separately during the mixing, since an aqueous starch solution can not be pre-fab ⁇ cated because of its quick coagulation. This circumstance complicates the pelletizmg process due to the fact that a uniform distribution of a dry component m a blend volume is more difficult than that of a liquid component
  • the p ⁇ ncipal objects of the present invention are: to improve the strength of pellets and increase the yield of predetermined fraction of pellets while simplifying the process for distributing an organic binder by adding thereof m liquid form - m an aqueous solution.
  • the mixer-pelletizer is additionally loaded with milled aluminosilicate raw mate ⁇ als m a concentration of 10 to 50 % by weight, based on the total weight of the starting raw materials, at a constant rotational speed of the rotor agitator ranging from 300 to 1 ,500 rpm. It is proposed to use as the moistener an aqueous solution of an organic binder selected from the group consisting of carboxymethyl cellulose, methyl cellulose, industrial lignosulphonates m a concentration of 10 to 30 % by weight, based on the total weight of the starting raw materials.
  • the present invention also embraces pellets prepared using the proposed method.
  • the formation of granulation nuclei is initiated upon increase m a moister content of the starting raw materials.
  • a liquid component makes it possible for the particle mobility of the starting raw materials to be increased, thus enabling one to obtain a high density of the mass to be pelletized.
  • increase m a diameter of pellets to be formed it is necessary to augment a force to compact the structure of pellets. Desired forces compacting the pellets are brought about with high linear velocities of particles following a vortex trajectory of the mass to be pelletized.
  • required structure and shape of a pellet derive at the expense of the pellet rotation about its own axis.
  • velocity vector components dependent on the rotor agitator rotational speed define mam characteristics of resultant pellets and parameters of the pelletizmg process. Therefore, a possibility to vary a rotor agitator rotational speed m proportion to a blend moisture content and depending on a particular stage of the pelletizmg process is an important distinctive feature of the proposed method of making pellets from aluminosilicate raw materials.
  • bauxite containing (% by weight): A1 2 0 3 - 65.0-75.0; S ⁇ 0 2 - 16.0-20.0; Fe- - 1.5-3.0, T ⁇ 0 2 - 2.5-5.0; Na 2 0 + K 2 0 - 0 5-3.0, CaO + MgO - 0.25-2.0, milled to an average particle size of 3-5 microns, having water absorption of 15-45 % and fired at a temperature not exceeding 1 150 ° C, that is, before start of the process for crystallizing the structure which hampers bauxite milling and makes it less moldable.
  • a rotational speed of the rotor agitator is varied during pelletization.
  • a rotational speed of the rotor agitator is set to be preferably from 700 to 800 rpm (1 1.5-13.5 m/sec).
  • the pelletizer is loaded with a binder in a preferred concentration of 12 to 15 % by weight, based on the total weight of the starting raw materials .
  • a rotational speed of the rotor agitator is increased preferably to 1 ,800-2,000 rpm (30-33 m/sec) while increasing the amount of the moistener added to the raw materials.
  • Pelletization at a high speed of the rotor agitator is continued for 2-5 minutes and, when fine pellets having a 0.1-0.3 mm size appear, a rotational speed of the rotor agitator is decreased preferably to 700-
  • the mixer is loaded with a milled bauxite for powdering at a rate of from 20 to 100 kg/min in a preferred concentration of
  • pellets 15 to 20 % by weight, based on the total weight of the starting raw materials, which is necessary to obtain pellets of predetermined size.
  • green pellets are dumped, dried at 1 10-320 ° C for 20-60 minutes to a residual moister of below 1.0 % and fired at 1350-1600 ° C for 30-70 minutes to water absorption of less than 1.5 %, density of 2.5-3.2 g/cm 3 and bulk density of 1.3-1.85 g/cm 3 .
  • bauxite containing (% by weight): A1 2 0 3 - 71.3; Si0 2 - 16.9; Fe 2 0 3 - 1.7; Ti0 2 - 4.2; Na 2 0 + K 2 0 - 1.1 ; CaO + MgO - 1.3 is used. Bauxite pre-crushed using a roll crusher to a grain size not exceeding 60 mm is fired to water absorption of 30 % at 1100 ° C. Thus fired bauxite is ground in a ball mill to a grain size of 2-3 mm. Fine-grinding of bauxite is carried out in a tube mill to an average grain size of from 3 to 5 microns. As a moistener, use is made of a 3 % aqueous solution of carboxymethyl cellulose prepared in the reaction vessel equipped with a central vertical agitator, at 65-75 ° C.
  • a mixer-pelletizer whose pan rotates at a constant speed of 20 rpm, is loaded with 300 kg of the milled bauxite and 50 kg of a 3 % aqueous solution of carboxymethyl cellulose for 80 seconds, while increasing a rotational speed of the rotor agitator from 300 rpm (5 m/sec) to 3,000 rpm (50 m/sec). Then an intense mixing is carried out for 1.5 minutes at a rotational speed of the rotor agitator of 3,000 rpm (50 m/sec) until formation of pellets having 0.1-0.3 mm in size.
  • a rotational speed of the rotor agitator is decreased to 300 rpm (5 m/sec) and the mixer-pelletizer is loaded with 100 kg of the milled bauxite at a rate of 50 kg/min. Rotation of the mixer pan and rotor agitator is continued under these conditions for 4 minutes until formation of properly pelletized granules.
  • the concentration of pellets thus formed with 0.4-1.4 mm in size amounts to 60-65 % by weight, based on the total weight of pellets.
  • Pellets thus obtained are screened, a 0.4-1.6 mm fraction is separated, dried in a rotary drier drum at 150-180 ° C for 50 minutes.
  • Pellet fractions of +1.6 mm and -0.4 mm in size are recycled to milling in a ball mill.
  • Dried pellets having a 0.6 % moister are fired at 1550 ° C for 45 minutes in a rotary kiln to water absorption of 0.6-0.8 %.
  • Pellets so obtained are screened into commercial-grade fractions.
  • EXAMPLE 2 EXAMPLE 2.
  • a method of making pellets similar to that described in Example 1 characterized in that a rotational speed of the rotor agitator, when supplying a binding component, is increased from 800 rpm ( 13.3 m/sec) to 1 ,800 rpm (30 m/sec) at a rate of changing revolutions of 12.5 rpm per second.
  • EXAMPLE 3 A method of making pellets similar to that described in Example 1 , characterized in that a rotational speed of the rotor agitator, when supplying a binding component, is increased from 250 rpm (4.2 m/sec) to 3,050 rpm (50.8 m/sec j at a rate of changing revolutions of 35 rpm per second.
  • EXAMPLE 4 A method of making pellets similar to that described in Example 2, characterized in that a rotational speed of the rotor agitator, when additionally supplying a milled bauxite for powdering and until the termination of pelletization, is 1.500 rpm (25 m/sec).
  • EXAMPLE 5 A method of making pellets similar to that described in Example 2, characterized in that a rotational speed of the rotor agitator, when additionally supplying a milled bauxite for powdering and until the termination of pelletization, is 800 rpm (13.3 m/sec).
  • EXAMPLE 6 A method of making pellets similar to that described in Example 2, characterized in that a rotational speed of the rotor agitator, when additionally supplying a milled bauxite for powdering and until the termination of pelletization, is 1.550 rpm (25.8 m/sec).
  • EXAMPLE 7 A method of making pellets similar to that described in Example 2, characterized in that a rotational speed of the rotor agitator, when additionally supplying a milled bauxite for powdering and until the termination of pelletization, is 250 rpm (4.2 m/sec).
  • EXAMPLE 8 A method of making pellets similar to that described in Example 5, characterized in that the amount of a moistener added to the pelletizer is 30 kg (10 % by weight, based on the total weight of the starting raw materials).
  • EXAMPLE 9. A method of making pellets similar to that described in Example 5, characterized in that the amount of a moistener added to the pelletizer is 90 kg (30 % by weight, based on the total weight of the starting raw materials).
  • EXAMPLE 10 A method of making pellets similar to that described in Example 5, characterized in that the amount of a moistener added to the pelletizer is 25 kg (8.3 % by weight, based on the total weight of the starting raw materials), a rotational speed of the rotor agitator, when additionally supplying a milled bauxite and until the termination of pelletization, is 1 ,500 rpm (25 m/sec).
  • EXAMPLE 1 A method of making pellets similar to that described in Example 5, characterized in that the amount of a moistener added to the pelletizer is 95 kg (31.7 % by weight), a rotational speed of the rotor agitator, when additionally supplying a milled bauxite and until the termination of pelletization, is 1,500 rpm (25 m/sec).
  • EXAMPLE 12 A method of making pellets similar to that described in Example 5, characterized in that the amount of a milled bauxite additionally supplied to the pelletizer is 30 kg (10 % by weight, based on the total weight of the starting raw materials).
  • EXAMPLE 13 A method of making pellets similar to that described in Example 5, characterized in that the amount of a milled bauxite additionally supplied to the pelletizer is 150 kg (50 % by weight, based on the total weight of the starting raw materials).
  • EXAMPLE 14 A method of making pellets similar to that described in Example 5, characterized in that the amount of a milled bauxite additionally supplied to the pelletizer is 25 kg (8.3 % by weight, based on the total weight of the starting raw materials).
  • EXAMPLE 15 A method of making pellets similar to that described in Example 5, characterized in that the amount of a milled bauxite additionally supplied to the pelletizer is 155 kg (51.7 % by weight, based on the total weight of the starting raw materials). Data with respect to all the above-described examples are summa ⁇ zed m the Table given below.
  • Pellets obtained under conditions described m Examples 1 -15 were studied with respect to mam quality indices. Compressive strength was tested employing four pressure values. Reactivity was determined by dissolving m a mixture of 12 % HCl and 3 % HF. To compare properties of pellets obtained in accordance with the present invention and that obtained under conditions of the prior art method, characteristics of these pellets are reported.

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  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Processing And Handling Of Plastics And Other Materials For Molding In General (AREA)
  • Compounds Of Alkaline-Earth Elements, Aluminum Or Rare-Earth Metals (AREA)
  • Glanulating (AREA)
  • Compositions Of Oxide Ceramics (AREA)

Abstract

The present invention relates to the processing of aluminosilicate raw materials when fabricating granulated materials intended to be used in different branches of industry employing pellets, for example as propping agents in oil recovery by hydraulically fracturing the oil-bearing bed. The proposed method enables solution of the following objects: improvements in the strength of pellets and the yield of predetermined fraction of pellets while simplifying the process for distributing an organic binder by adding thereof in liquid form -in an aqueous solution. The method comprises charging the starting raw materials, their moistening and mixing in a mixer-pelletizer equipped with a pan and a rotor agitator rotating at a constant speed. During the process for feeding a moistener, a rotational speed of said rotor agitator is increased directly proportionally to the amount of the added moistener (an aqueous solution of an organic binder selected from the group consisting of carboxymethyl cellulose, methyl cellulose, industrial lignosulphonates), from 300 to 3,000 rpm (from 5 to 500 m/sec). After the formation of pellets, the mixer-pelletizer is additionally loaded with milled aluminosilicate raw materials in a concentration of 10 to 50 % by weight, based on the total weight of the starting raw materials, at a rotational speed of the rotor agitator ranging from 300 to 1,500 rpm (from 5 to 25 m/sec).

Description

METHOD OF MAKING PELLETS FROM ALUMINOSILICATE RAW
MATERIALS
FIELD OF THE INVENTION The present invention relates generally to the processing of aluminosilicate raw materials \λ hen fabricating granulated materials intended to be used different branches of industry employing pellets, for example as propping agents m oil recovery
Figure imgf000003_0001
hydraulically fracturing the oil-beaπng bed.
BACKGROUND OF THE INVENTION
The closest pπor art with respect to a totality of essential features of the presently disclosed invention has been described m the Arup Khaund patent, U.S.
Pat. No. 4,668.645, m which, in order to manufacture granules, a mixture of milled bauxitic clay and corn starch is used. A calcined milled bauxitic clay
(about 450 kg) and starch grains (about 15 kg) are mixed dry m a standard pm type mixing tool at a low speed for about 15 seconds at which time about 135 kg of water is added. After the addition of water, the mixing is switched to high speed for proper compaction of the mixture. The high speed is continued for about 1-2 minutes at which time the mixing is switched to slow speed and about
180 kg of the calcined milled bauxitic clay is added to the mixture. After the addition is completed, mixing is continued for about 10-15 seconds and thus formed green spherical pellets are dumped from the mixer, dπed and fired at
1480° C. to 1500° C. for 45 minutes in a rotary kiln.
A drawback of this known method is associated with mixing of the blend and formation of the pellets at a time of supplying water at a constant mixer speed. Such pelletizmg conditions fail to provide a uniform compaction of the moistened mass and, accordingly, a density-uniform structure of the calcined granules, nor the> provide a maximum output of predetermined fraction of pellets. In addition, the use of corn starch as a binding component requires that this component and v. ater be supplied separately during the mixing, since an aqueous starch solution can not be pre-fabπcated because of its quick coagulation. This circumstance complicates the pelletizmg process due to the fact that a uniform distribution of a dry component m a blend volume is more difficult than that of a liquid component
SUMMARY OF THE INVENTION
The proposed method of making pellets from aluminosilicate raw mateπals enables one to a\ oid shortcomings inherent m pπor art technical solutions such as described above
The pπncipal objects of the present invention are: to improve the strength of pellets and increase the yield of predetermined fraction of pellets while simplifying the process for distributing an organic binder by adding thereof m liquid form - m an aqueous solution.
The above and other objects and advantages of the present invention are achieved by the fact that m a method of making pellets from aluminosilicate raw mateπals, it is proposed to increase, duπng the process for feeding a moistener into a mixer-pelletizer, a rotational speed of a rotor agitator from 300 to 3,000 rpm directly proportionally to the amount of the moistener added. Thereupon, m order to increase the yield of properly pelletized granules of predetermined size and to improve their strength, the mixer-pelletizer is additionally loaded with milled aluminosilicate raw mateπals m a concentration of 10 to 50 % by weight, based on the total weight of the starting raw materials, at a constant rotational speed of the rotor agitator ranging from 300 to 1 ,500 rpm. It is proposed to use as the moistener an aqueous solution of an organic binder selected from the group consisting of carboxymethyl cellulose, methyl cellulose, industrial lignosulphonates m a concentration of 10 to 30 % by weight, based on the total weight of the starting raw materials.
The present invention also embraces pellets prepared using the proposed method.
The formation of granulation nuclei is initiated upon increase m a moister content of the starting raw materials. The presence of a liquid component makes it possible for the particle mobility of the starting raw materials to be increased, thus enabling one to obtain a high density of the mass to be pelletized. With increase m a diameter of pellets to be formed, it is necessary to augment a force to compact the structure of pellets. Desired forces compacting the pellets are brought about with high linear velocities of particles following a vortex trajectory of the mass to be pelletized. Moreover, required structure and shape of a pellet derive at the expense of the pellet rotation about its own axis. In this way, velocity vector components dependent on the rotor agitator rotational speed define mam characteristics of resultant pellets and parameters of the pelletizmg process. Therefore, a possibility to vary a rotor agitator rotational speed m proportion to a blend moisture content and depending on a particular stage of the pelletizmg process is an important distinctive feature of the proposed method of making pellets from aluminosilicate raw materials.
Additional objects and advantages of the present invention will be set forth in the detailed description which follows, and m part will be obvious from the description, or may be learned by practice of the invention.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS To produce pellets, it is proposed to use bauxite containing (% by weight): A1203 - 65.0-75.0; Sι02 - 16.0-20.0; Fe- - 1.5-3.0, Tι02 - 2.5-5.0; Na20 + K20 - 0 5-3.0, CaO + MgO - 0.25-2.0, milled to an average particle size of 3-5 microns, having water absorption of 15-45 % and fired at a temperature not exceeding 1 150° C, that is, before start of the process for crystallizing the structure which hampers bauxite milling and makes it less moldable. As established by pelletizing this bauxite in a laboratory-scale mixer-pelletizer EIRICH R02, just such a bauxite promotes a quick formation of pellet nuclei resulting in properly pelletized granules of predetermined size. The use as a moistener of an 1.0-5.0 % aqueous solution of carboxymethyl cellulose enables one to readily achieve a uniform binder distribution at a time of mixing in the mixer-pelletizer.
To manufacture pellets having a minimum internal porosity, a rotational speed of the rotor agitator is varied during pelletization. At the onset of pelletization, after the addition of a milled fired bauxite, a rotational speed of the rotor agitator is set to be preferably from 700 to 800 rpm (1 1.5-13.5 m/sec). Then the pelletizer is loaded with a binder in a preferred concentration of 12 to 15 % by weight, based on the total weight of the starting raw materials .At a time of supplying the binder, a rotational speed of the rotor agitator is increased preferably to 1 ,800-2,000 rpm (30-33 m/sec) while increasing the amount of the moistener added to the raw materials. Pelletization at a high speed of the rotor agitator is continued for 2-5 minutes and, when fine pellets having a 0.1-0.3 mm size appear, a rotational speed of the rotor agitator is decreased preferably to 700-
800 rpm (1 1.5-13.5 m sec). At that time the mixer is loaded with a milled bauxite for powdering at a rate of from 20 to 100 kg/min in a preferred concentration of
15 to 20 % by weight, based on the total weight of the starting raw materials, which is necessary to obtain pellets of predetermined size. In 1-5 minutes after powdering is completed, green pellets are dumped, dried at 1 10-320° C for 20-60 minutes to a residual moister of below 1.0 % and fired at 1350-1600° C for 30-70 minutes to water absorption of less than 1.5 %, density of 2.5-3.2 g/cm3 and bulk density of 1.3-1.85 g/cm3.
The following examples illustrate various embodiments of this invention, and are not to be interpreted as limiting the scope of the appended claims. In all these examples, bauxite having the same chemical composition is used. EXAMPLE 1
For pelletization, bauxite containing (% by weight): A1203 - 71.3; Si02 - 16.9; Fe203 - 1.7; Ti02 - 4.2; Na20 + K20 - 1.1 ; CaO + MgO - 1.3 is used. Bauxite pre-crushed using a roll crusher to a grain size not exceeding 60 mm is fired to water absorption of 30 % at 1100° C. Thus fired bauxite is ground in a ball mill to a grain size of 2-3 mm. Fine-grinding of bauxite is carried out in a tube mill to an average grain size of from 3 to 5 microns. As a moistener, use is made of a 3 % aqueous solution of carboxymethyl cellulose prepared in the reaction vessel equipped with a central vertical agitator, at 65-75° C.
A mixer-pelletizer whose pan rotates at a constant speed of 20 rpm, is loaded with 300 kg of the milled bauxite and 50 kg of a 3 % aqueous solution of carboxymethyl cellulose for 80 seconds, while increasing a rotational speed of the rotor agitator from 300 rpm (5 m/sec) to 3,000 rpm (50 m/sec). Then an intense mixing is carried out for 1.5 minutes at a rotational speed of the rotor agitator of 3,000 rpm (50 m/sec) until formation of pellets having 0.1-0.3 mm in size. Thereafter, a rotational speed of the rotor agitator is decreased to 300 rpm (5 m/sec) and the mixer-pelletizer is loaded with 100 kg of the milled bauxite at a rate of 50 kg/min. Rotation of the mixer pan and rotor agitator is continued under these conditions for 4 minutes until formation of properly pelletized granules. The concentration of pellets thus formed with 0.4-1.4 mm in size amounts to 60-65 % by weight, based on the total weight of pellets.
Pellets thus obtained are screened, a 0.4-1.6 mm fraction is separated, dried in a rotary drier drum at 150-180° C for 50 minutes. Pellet fractions of +1.6 mm and -0.4 mm in size are recycled to milling in a ball mill. Dried pellets having a 0.6 % moister are fired at 1550° C for 45 minutes in a rotary kiln to water absorption of 0.6-0.8 %. Pellets so obtained are screened into commercial-grade fractions. EXAMPLE 2. A method of making pellets similar to that described in Example 1 , characterized in that a rotational speed of the rotor agitator, when supplying a binding component, is increased from 800 rpm ( 13.3 m/sec) to 1 ,800 rpm (30 m/sec) at a rate of changing revolutions of 12.5 rpm per second.
EXAMPLE 3. A method of making pellets similar to that described in Example 1 , characterized in that a rotational speed of the rotor agitator, when supplying a binding component, is increased from 250 rpm (4.2 m/sec) to 3,050 rpm (50.8 m/sec j at a rate of changing revolutions of 35 rpm per second.
EXAMPLE 4. A method of making pellets similar to that described in Example 2, characterized in that a rotational speed of the rotor agitator, when additionally supplying a milled bauxite for powdering and until the termination of pelletization, is 1.500 rpm (25 m/sec).
EXAMPLE 5. A method of making pellets similar to that described in Example 2, characterized in that a rotational speed of the rotor agitator, when additionally supplying a milled bauxite for powdering and until the termination of pelletization, is 800 rpm (13.3 m/sec).
EXAMPLE 6. A method of making pellets similar to that described in Example 2, characterized in that a rotational speed of the rotor agitator, when additionally supplying a milled bauxite for powdering and until the termination of pelletization, is 1.550 rpm (25.8 m/sec).
EXAMPLE 7. A method of making pellets similar to that described in Example 2, characterized in that a rotational speed of the rotor agitator, when additionally supplying a milled bauxite for powdering and until the termination of pelletization, is 250 rpm (4.2 m/sec).
EXAMPLE 8. A method of making pellets similar to that described in Example 5, characterized in that the amount of a moistener added to the pelletizer is 30 kg (10 % by weight, based on the total weight of the starting raw materials). EXAMPLE 9. A method of making pellets similar to that described in Example 5, characterized in that the amount of a moistener added to the pelletizer is 90 kg (30 % by weight, based on the total weight of the starting raw materials).
EXAMPLE 10. A method of making pellets similar to that described in Example 5, characterized in that the amount of a moistener added to the pelletizer is 25 kg (8.3 % by weight, based on the total weight of the starting raw materials), a rotational speed of the rotor agitator, when additionally supplying a milled bauxite and until the termination of pelletization, is 1 ,500 rpm (25 m/sec).
EXAMPLE 1 1. A method of making pellets similar to that described in Example 5, characterized in that the amount of a moistener added to the pelletizer is 95 kg (31.7 % by weight), a rotational speed of the rotor agitator, when additionally supplying a milled bauxite and until the termination of pelletization, is 1,500 rpm (25 m/sec).
EXAMPLE 12. A method of making pellets similar to that described in Example 5, characterized in that the amount of a milled bauxite additionally supplied to the pelletizer is 30 kg (10 % by weight, based on the total weight of the starting raw materials).
EXAMPLE 13. A method of making pellets similar to that described in Example 5, characterized in that the amount of a milled bauxite additionally supplied to the pelletizer is 150 kg (50 % by weight, based on the total weight of the starting raw materials).
EXAMPLE 14. A method of making pellets similar to that described in Example 5, characterized in that the amount of a milled bauxite additionally supplied to the pelletizer is 25 kg (8.3 % by weight, based on the total weight of the starting raw materials).
EXAMPLE 15. A method of making pellets similar to that described in Example 5, characterized in that the amount of a milled bauxite additionally supplied to the pelletizer is 155 kg (51.7 % by weight, based on the total weight of the starting raw materials). Data with respect to all the above-described examples are summaπzed m the Table given below.
Pellets obtained under conditions described m Examples 1 -15 were studied with respect to mam quality indices. Compressive strength was tested employing four pressure values. Reactivity was determined by dissolving m a mixture of 12 % HCl and 3 % HF. To compare properties of pellets obtained in accordance with the present invention and that obtained under conditions of the prior art method, characteristics of these pellets are reported.
Table
Exam- Pycno- Bulk Roundness Sphericity Strength (number of destroyed particles), Solubility pie metric Density, t. %, under pressure, MPa in a density, g/cm mixture of g/cm3 acids
12 %
HC1/3 %
HF
52 70 88 105
0.4-0.8 mm fraction
1 2.97 1.85 0.8 0.8 3.2 4.4 7.8 - 4.9
2 2.86 1.74 0.8 0.9 3.1 4.2 7.5 10.8 4.9
3 3.05 1.92 0.8 0.8 4.5 7.6 9.3 - 5.0
4 2.85 1.77 0.8 0.9 3.8 4.2 7.6 9.8 4.4
5 2.89 1.80 0.9 0.9 2.7 3.8 7.1 9.4 3.6
6 2.91 1.84 0.8 0.8 5.2 7.3 9.6 - 4.5
7 2.88 1.79 0.8 0.8 5.4 7.7 9.3 - 4.4
8 2.78 1.73 0.7 0.7 5.7 8.0 10.2 - 4.8
9 2.87 1.79 0.7 0.7 6.3 8.8 12.3 - 4.9
10 2.70 1.71 0.7 0.7 7.9 10.5 - - 5.3
1 1 2.86 1.78 0.7 0.7 8.3 12.4 - - 5.2
12 2.82 1.75 0.7 0.7 6.1 8.3 14.2 - 4.9
13 2.85 1.77 0.7 0.9 5.0 7.2 9.6 - 4.4
14 2.77 1.70 0.6 0.7 5.2 8.4 12.1 - 4.1
15 3.05 1.85 0.9 0.9 4.9 7.8 9.7 13.1 4.0
Prior 3.05 1.85 0.9 0.8 5.1 7.9 9.5 12.1 3.9 art
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Claims

WHAT IS CLAIMED IS:
1. A method of making pellets from aluminosilicate raw materials comprising charging the starting raw materials into a pan mixer-pelletizer equipped with a rotor agitator, moistening and mixing, characterized in that during the process for feeding a moistener, a rotational speed of said rotor agitator is increased from 300 to 3,000 rpm directly proportionally to the amount of the moistener added and, in order to increase the yield of properly pelletized granules of predetermined size and to improve their strength, the mixer-pelletizer is additionally loaded with milled aluminosilicate raw materials in a concentration of 10 to 50 % by weight, based on the total weight of the starting raw materials, at a constant rotational speed of the rotor agitator ranging from 300 to 1 ,500 rpm.
2. The method according to claim 1, characterized in that an aqueous solution of an organic binder selected from the group consisting of carboxymethyl cellulose, methyl cellulose, lignosulphonates is used as said moistener.
3. The method according to claim 1 or claim 2, characterized in that the aqueous solution of said organic binder is added in a concentration of 10 to 30 % by weight, based on the total weight of the starting raw materials.
4. Pellets made of aluminosilicate raw materials, characterized in that said pellets are prepared using the method according to any one of claims 1 to 3.
PCT/RU1999/000138 1998-01-09 1999-04-27 Method of making pellets from aluminosilicate raw materials WO2000064573A1 (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
RU98101587A RU2129987C1 (en) 1998-01-09 1998-01-09 Method of processing alumino-silicon crude
AU10866/00A AU1086600A (en) 1998-01-09 1999-04-27 Method of making pellets from aluminosilicate raw materials
PCT/RU1999/000138 WO2000064573A1 (en) 1998-01-09 1999-04-27 Method of making pellets from aluminosilicate raw materials

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
RU98101587A RU2129987C1 (en) 1998-01-09 1998-01-09 Method of processing alumino-silicon crude
PCT/RU1999/000138 WO2000064573A1 (en) 1998-01-09 1999-04-27 Method of making pellets from aluminosilicate raw materials

Publications (1)

Publication Number Publication Date
WO2000064573A1 true WO2000064573A1 (en) 2000-11-02

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/RU1999/000138 WO2000064573A1 (en) 1998-01-09 1999-04-27 Method of making pellets from aluminosilicate raw materials

Country Status (3)

Country Link
AU (1) AU1086600A (en)
RU (1) RU2129987C1 (en)
WO (1) WO2000064573A1 (en)

Cited By (2)

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EP1291071A1 (en) * 2001-09-07 2003-03-12 IPC Process-Center GmbH & Co. Process for making a homogeneous granulate
WO2012056077A1 (en) * 2010-10-26 2012-05-03 Antonio Arnau Villanova Granulation by agglomeration of ceramic compositions ground in dry phase

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EP1799962A2 (en) 2004-09-14 2007-06-27 Carbo Ceramics Inc. Sintered spherical pellets
BRPI0609373A2 (en) 2005-03-01 2010-03-30 Carbo Ceramics Inc methods for producing sintered particles of a slurry from an alumina-containing raw material
DE102005045180B4 (en) 2005-09-21 2007-11-15 Center For Abrasives And Refractories Research & Development C.A.R.R.D. Gmbh Spherical corundum grains based on molten aluminum oxide and a process for their preparation
US7828998B2 (en) 2006-07-11 2010-11-09 Carbo Ceramics, Inc. Material having a controlled microstructure, core-shell macrostructure, and method for its fabrication
CA2661799A1 (en) 2006-08-30 2008-03-06 Carbo Ceramics Inc. Low bulk density proppant and methods for producing the same
US8562900B2 (en) 2006-09-01 2013-10-22 Imerys Method of manufacturing and using rod-shaped proppants and anti-flowback additives
US7721804B2 (en) 2007-07-06 2010-05-25 Carbo Ceramics Inc. Proppants for gel clean-up
RU2452759C1 (en) * 2010-10-05 2012-06-10 Общество С Ограниченной Ответственностью "Форэс" Method of producing ceramic proppants
RU2568486C2 (en) * 2014-01-09 2015-11-20 Открытое акционерное общество "Боровичский комбинат огнеупоров" Multilayered proppant and method for obtaining it
RU2644369C1 (en) * 2016-09-19 2018-02-09 Акционерное общество "Боровичский комбинат огнеупоров" Proppant production method and proppant
RU2651680C1 (en) * 2016-11-15 2018-04-23 Общество с ограниченной ответственностью "Красноярский Завод Проппантов" Method for manufacture of lightweight magnesia-quartz proppant

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US4243365A (en) * 1979-04-20 1981-01-06 Phillips Petroleum Company Carbon black pellet and method and apparatus for producing same
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EP0264049A1 (en) * 1986-10-17 1988-04-20 Bayer Ag Process for obtaining granules
EP0699640A1 (en) * 1994-08-05 1996-03-06 Manfredini E Schianchi S.R.L Method for producing granules from ceramic powders, said granules and apparatus for their production

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US4243365A (en) * 1979-04-20 1981-01-06 Phillips Petroleum Company Carbon black pellet and method and apparatus for producing same
EP0169412A1 (en) * 1984-07-05 1986-01-29 Norton Company Proppant for oil and gas wells
US4668645A (en) * 1984-07-05 1987-05-26 Arup Khaund Sintered low density gas and oil well proppants from a low cost unblended clay material of selected composition
EP0264049A1 (en) * 1986-10-17 1988-04-20 Bayer Ag Process for obtaining granules
EP0699640A1 (en) * 1994-08-05 1996-03-06 Manfredini E Schianchi S.R.L Method for producing granules from ceramic powders, said granules and apparatus for their production

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1291071A1 (en) * 2001-09-07 2003-03-12 IPC Process-Center GmbH & Co. Process for making a homogeneous granulate
WO2012056077A1 (en) * 2010-10-26 2012-05-03 Antonio Arnau Villanova Granulation by agglomeration of ceramic compositions ground in dry phase

Also Published As

Publication number Publication date
RU2129987C1 (en) 1999-05-10
AU1086600A (en) 2000-11-10

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