CN112588282A - Method for preparing binary composite catalytic cracking molecular sieve precursor from coal gangue - Google Patents
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- 239000003245 coal Substances 0.000 title claims abstract description 59
- 238000000034 method Methods 0.000 title claims abstract description 26
- 238000004523 catalytic cracking Methods 0.000 title claims abstract description 25
- 239000002808 molecular sieve Substances 0.000 title claims abstract description 18
- URGAHOPLAPQHLN-UHFFFAOYSA-N sodium aluminosilicate Chemical compound [Na+].[Al+3].[O-][Si]([O-])=O.[O-][Si]([O-])=O URGAHOPLAPQHLN-UHFFFAOYSA-N 0.000 title claims abstract description 18
- 239000011218 binary composite Substances 0.000 title claims abstract description 16
- 239000002243 precursor Substances 0.000 title claims abstract description 11
- 238000001354 calcination Methods 0.000 claims abstract description 48
- 239000000843 powder Substances 0.000 claims abstract description 42
- 239000002245 particle Substances 0.000 claims abstract description 37
- 239000002002 slurry Substances 0.000 claims abstract description 34
- NLYAJNPCOHFWQQ-UHFFFAOYSA-N kaolin Chemical compound O.O.O=[Al]O[Si](=O)O[Si](=O)O[Al]=O NLYAJNPCOHFWQQ-UHFFFAOYSA-N 0.000 claims abstract description 24
- 239000005995 Aluminium silicate Substances 0.000 claims abstract description 22
- 235000012211 aluminium silicate Nutrition 0.000 claims abstract description 22
- 239000004005 microsphere Substances 0.000 claims abstract description 20
- 238000002156 mixing Methods 0.000 claims abstract description 18
- 239000002994 raw material Substances 0.000 claims abstract description 15
- 238000001694 spray drying Methods 0.000 claims abstract description 15
- 238000000227 grinding Methods 0.000 claims abstract description 13
- KZHJGOXRZJKJNY-UHFFFAOYSA-N dioxosilane;oxo(oxoalumanyloxy)alumane Chemical compound O=[Si]=O.O=[Si]=O.O=[Al]O[Al]=O.O=[Al]O[Al]=O.O=[Al]O[Al]=O KZHJGOXRZJKJNY-UHFFFAOYSA-N 0.000 claims abstract description 9
- 229910052863 mullite Inorganic materials 0.000 claims abstract description 9
- 229910052596 spinel Inorganic materials 0.000 claims abstract description 9
- 239000011029 spinel Substances 0.000 claims abstract description 9
- 239000012018 catalyst precursor Substances 0.000 claims abstract description 8
- 239000011230 binding agent Substances 0.000 claims abstract description 5
- 238000001035 drying Methods 0.000 claims description 19
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 12
- 239000012535 impurity Substances 0.000 claims description 12
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 12
- 238000004537 pulping Methods 0.000 claims description 10
- 239000011265 semifinished product Substances 0.000 claims description 9
- 238000010438 heat treatment Methods 0.000 claims description 6
- 229910052742 iron Inorganic materials 0.000 claims description 6
- 239000007787 solid Substances 0.000 claims description 6
- 238000001816 cooling Methods 0.000 claims description 5
- 239000011268 mixed slurry Substances 0.000 claims description 5
- NTHWMYGWWRZVTN-UHFFFAOYSA-N sodium silicate Chemical compound [Na+].[Na+].[O-][Si]([O-])=O NTHWMYGWWRZVTN-UHFFFAOYSA-N 0.000 claims description 5
- 229910052500 inorganic mineral Inorganic materials 0.000 claims description 4
- 239000011707 mineral Substances 0.000 claims description 4
- 239000011362 coarse particle Substances 0.000 claims description 3
- 230000018044 dehydration Effects 0.000 claims description 3
- 238000006297 dehydration reaction Methods 0.000 claims description 3
- 238000007599 discharging Methods 0.000 claims description 3
- 239000002270 dispersing agent Substances 0.000 claims description 3
- GCLGEJMYGQKIIW-UHFFFAOYSA-H sodium hexametaphosphate Chemical compound [Na]OP1(=O)OP(=O)(O[Na])OP(=O)(O[Na])OP(=O)(O[Na])OP(=O)(O[Na])OP(=O)(O[Na])O1 GCLGEJMYGQKIIW-UHFFFAOYSA-H 0.000 claims description 3
- 235000019982 sodium hexametaphosphate Nutrition 0.000 claims description 3
- 239000000126 substance Substances 0.000 claims description 3
- 239000001577 tetrasodium phosphonato phosphate Substances 0.000 claims description 3
- 238000009423 ventilation Methods 0.000 claims description 3
- 238000001238 wet grinding Methods 0.000 claims description 3
- 239000004115 Sodium Silicate Substances 0.000 claims description 2
- 229910052911 sodium silicate Inorganic materials 0.000 claims description 2
- 239000011882 ultra-fine particle Substances 0.000 claims description 2
- 238000010304 firing Methods 0.000 claims 1
- 239000000203 mixture Substances 0.000 claims 1
- 239000003054 catalyst Substances 0.000 abstract description 12
- 238000002360 preparation method Methods 0.000 abstract description 4
- 239000002699 waste material Substances 0.000 abstract description 4
- 239000000047 product Substances 0.000 description 7
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 6
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 4
- 238000002425 crystallisation Methods 0.000 description 4
- 230000008025 crystallization Effects 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 4
- 238000005406 washing Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 235000010755 mineral Nutrition 0.000 description 3
- 235000019353 potassium silicate Nutrition 0.000 description 3
- 239000000758 substrate Substances 0.000 description 3
- 239000000853 adhesive Substances 0.000 description 2
- 230000001070 adhesive effect Effects 0.000 description 2
- -1 chemical engineering Substances 0.000 description 2
- 239000011159 matrix material Substances 0.000 description 2
- 239000003973 paint Substances 0.000 description 2
- 239000004033 plastic Substances 0.000 description 2
- 229920003023 plastic Polymers 0.000 description 2
- 229910052761 rare earth metal Inorganic materials 0.000 description 2
- 150000002910 rare earth metals Chemical class 0.000 description 2
- 239000005060 rubber Substances 0.000 description 2
- 235000011121 sodium hydroxide Nutrition 0.000 description 2
- 230000002194 synthesizing effect Effects 0.000 description 2
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 1
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 1
- 244000045719 Syzygium Species 0.000 description 1
- 235000012096 Syzygium samarangense Nutrition 0.000 description 1
- YKTSYUJCYHOUJP-UHFFFAOYSA-N [O--].[Al+3].[Al+3].[O-][Si]([O-])([O-])[O-] Chemical compound [O--].[Al+3].[Al+3].[O-][Si]([O-])([O-])[O-] YKTSYUJCYHOUJP-UHFFFAOYSA-N 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 238000003889 chemical engineering Methods 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 239000010419 fine particle Substances 0.000 description 1
- 238000005342 ion exchange Methods 0.000 description 1
- 229910052622 kaolinite Inorganic materials 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 229910052755 nonmetal Inorganic materials 0.000 description 1
- 238000005453 pelletization Methods 0.000 description 1
- 239000003208 petroleum Substances 0.000 description 1
- 239000011819 refractory material Substances 0.000 description 1
- 238000007873 sieving Methods 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
- 229910052710 silicon Inorganic materials 0.000 description 1
- 150000003376 silicon Chemical class 0.000 description 1
- 229910052814 silicon oxide Inorganic materials 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Classifications
-
- 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
- B01J21/00—Catalysts comprising the elements, oxides, or hydroxides of magnesium, boron, aluminium, carbon, silicon, titanium, zirconium, or hafnium
- B01J21/12—Silica and alumina
-
- 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
- B01J29/00—Catalysts comprising molecular sieves
- B01J29/04—Catalysts comprising molecular sieves having base-exchange properties, e.g. crystalline zeolites
- B01J29/06—Crystalline aluminosilicate zeolites; Isomorphous compounds thereof
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Crystallography & Structural Chemistry (AREA)
- Catalysts (AREA)
Abstract
The invention belongs to the technical field of preparation of catalysts by coal gangue, and provides a method for preparing a binary composite catalytic cracking molecular sieve precursor by utilizing coal gangue. The preparation method comprises the steps of crushing, grinding and calcining coal gangue to generate spinel/mullite kaolin powder, preparing slurry again, mixing the slurry with coal gangue ore pulp which is not calcined in proportion, adding a binder, performing spray drying to generate microspheres with a certain particle size, and calcining at low temperature to prepare a catalytic cracking catalyst precursor. The coal gangue is used as a raw material, and a binary composite active catalytic cracking catalyst precursor with high added value is produced by improving the process. The product has strong market competitiveness. On one hand, the method can meet the demand of the catalyst field, and simultaneously develops a new profit growth point for our company, thereby really realizing the purposes of changing waste into valuable, saving energy and reducing consumption, and leading the high added value comprehensive utilization of the waste coal gangue to be a new step.
Description
Technical Field
The invention belongs to the technical field of preparation of catalysts by using coal gangue, and particularly relates to a method for preparing a binary composite catalytic cracking molecular sieve precursor by using the coal gangue, wherein the coal gangue is hard kaolinite.
Background
Kaolin is a non-metal mineral powder material, has unique performance and continuously expanded application range, is widely applied to the fields of papermaking, rubber, plastics, cables, chemical engineering, paint coating and the like, and plays an important role in the development of modern high and new technology industries and the upgrading progress of traditional industrial products. The coal gangue is a kind of coal series kaolin, and it features that the original ore is black brown, and after calcinations, the whiteness is higher, and after deep processing such as crushing and calcinations, it can be used as functional material in the fields of paper making, paint, rubber and plastic, wire and cable, and refractory material. Different application functions can be endowed to the product by different processing technologies, and the invention aims to provide a technology for preparing a molecular sieve precursor binary composite matrix by utilizing coal gangue.
The conventional catalytic cracking catalyst is prepared by synthesizing NaY type molecular sieve with raw materials such as active alumina, active silicon, caustic soda and water glass, crystallizing, exchanging and roasting to form rare earth molecular sieve, mixing with selected substrate raw materials such as water washing kaolin, spray drying to generate microspheres with a certain particle size, and calcining.
In the prior art, raw materials such as activated alumina, activated silicon, caustic soda, water glass and the like are used for synthesizing the NaY type molecular sieve, and then the rare earth molecular sieve is formed through crystallization, ion exchange and roasting. Then mixing with substrate raw materials such as washing kaolin and the like, and carrying out spray drying to form microspheres with a certain particle size. Then calcined to become the catalytic cracking catalyst. The process is long, and needs to use raw materials such as activated alumina, activated silicon and the like, so that the manufacturing cost is high.
Disclosure of Invention
The invention provides a method for preparing a binary composite catalytic cracking molecular sieve precursor by utilizing coal gangue.
The invention is realized by the following technical scheme: a process for preparing the precursor of binary composite catalytic cracking molecular sieve from coal gangue includes such steps as grinding and calcining coal gangue to obtain spinel-type or mullite-type kaolin powder, proportionally mixing it with the ore pulp of coal gangue, adding adhesive, spray drying to obtain microspheres with a certain granularity, and low-temp calcining.
The method comprises the following specific steps:
(1) crushing: crushing raw coal gangue into raw coal gangue powder, crushing the raw coal gangue powder into raw coal gangue powder, and crushing the coal gangue powder to a particle size of less than or equal to 30 mm by using a hammer crusher in primary crushing; the second-stage crushing adopts a hurricane mill, and the coal gangue is crushed to a particle size of less than or equal to 45 microns;
(2) pulping raw materials and grinding: adding water into crushed raw coal gangue powder in a pulping tank to prepare pulp, mixing the raw coal gangue powder and the water according to the mass ratio of 1:1, adding a sodium hexametaphosphate dispersing agent accounting for 0.3-2.0% of the dry basis mass of the pulp to prepare pulp with the solid content of 50% -52%, feeding the pulp into wet grinding equipment, controlling the flow rate to be 1 ton/hour, grinding the pulp to obtain the pulp with the average particle size of 0.2 mu m, removing mechanical iron impurities and magnetic substances in minerals by using an iron removal facility, removing organic and inorganic large particles and impurities in the pulp by using impurity removal equipment to prepare the pulp with the content of 500 meshes less than 0.010%, namely the semi-finished raw pulp of No. 1;
(3) drying, scattering, calcining and scattering: and (3) conveying the 1# semi-finished product slurry to a drying tower for dehydration and drying, controlling the temperature of tower tail gas to be 110-120 ℃, drying the slurry into powder with the moisture content of less than 1%, smashing conglomerate particles formed in the drying process through a breaker, and discharging impurities with high hardness and coarse particles in the breaking process to prepare the pre-calcination powder with the average particle size of 0.2 micron.
The powder material is put into a kiln for calcination before calcination, the calcination temperature is controlled to be 1000-1100 ℃, the calcination time is 1 hour, the heating rate is 8-9 ℃ per minute, and the spinel/mullite calcined kaolin is obtained after calcination. After ventilation and cooling, crushing the conglomerate particles formed in the calcining process to obtain calcined kaolin powder with the average particle size of 0.8 micron;
(4) preparing slurry from clinker, mixing slurry, drying and pelletizing, and calcining: the spinel/mullite calcined kaolin powder is prepared into No. 2 calcined slurry by adding water according to 50 percent of solid content.
Mixing according to the mass ratio of 1:1, uniformly mixing the 1# semi-finished product raw slurry and the 2# finished product clinker slurry, adding a sodium silicate binder accounting for 1% of the dry basis mass of the mixed slurry, carrying out spray drying to prepare microspheres with the particle size of 60-80 microns, controlling the water content to be less than 1% by spray drying, calcining the microspheres in a kiln, controlling the calcining temperature to be 800-900 ℃, the calcining time to be 1 hour, and the heating rate to be 6-7 ℃ per minute, and carrying out air cooling after calcining to remove excessively fine particles with the particle size of less than 40 microns to obtain the binary composite catalytic cracking catalyst precursor.
The invention takes coal gangue as raw material to directly prepare the precursor of the catalytic cracking catalyst, and produces the catalytic cracking catalyst through crystallization, exchange and roasting. The technology breaks through the two-step process of the existing catalytic cracking catalyst, namely, the molecular sieve is firstly manufactured in the first step; and the second step, mixing the molecular sieve with the substrate raw materials such as washing kaolin or aluminum silicate, and carrying out spray drying to form balls. The coal gangue is used to directly replace the alumina and silicon oxide raw materials synthesized by molecular sieve and the matrix raw materials of washing kaolin and the like of catalytic cracking catalyst.
The invention takes coal gangue as raw material to produce kaolin microspheres for catalytic cracking catalyst. The kaolin microspheres contain calcined kaolin of spinel/mullite type and metakaolin of high activity. The microspheres have certain activity, can synthesize molecular sieves, have certain strength and meet the requirements of subsequent crystallization processes.
The coal gangue is used as a raw material, and a binary composite active catalytic cracking catalyst precursor with high added value is produced by improving the process. The high-added-value comprehensive utilization of coal gangue, which is a coal associated resource, belongs to a development direction of the comprehensive utilization of resources in coal producing areas of the Syzygium, and the product has strong market competitiveness. On one hand, the method can meet the demand of the catalyst field, and simultaneously develops a new profit growth point for our company, thereby really realizing the purposes of changing waste into valuable, saving energy and reducing consumption, and leading the high added value comprehensive utilization of the waste coal gangue to be a new step.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below, and it is obvious that the described embodiments are some embodiments of the present invention, but not all embodiments; all other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
A process for preparing the precursor of binary composite catalytic cracking molecular sieve from coal gangue includes such steps as grinding and calcining coal gangue to obtain spinel-type or mullite-type kaolin powder, proportionally mixing it with the ore pulp of coal gangue, adding adhesive, spray drying to obtain microspheres with a certain granularity, and low-temp calcining.
The method comprises the following specific steps:
(1) crushing: crushing raw coal gangue into raw coal gangue powder, crushing the raw coal gangue powder into raw coal gangue powder, and crushing the coal gangue powder to a particle size of less than or equal to 30 mm by using a hammer crusher in primary crushing; the second-stage crushing adopts a hurricane mill, and the coal gangue is crushed to a particle size of less than or equal to 45 microns;
(2) pulping raw materials: adding water into the crushed raw coal gangue powder in a pulping tank to prepare pulp, stirring and mixing according to the mass ratio of the raw coal gangue powder to the water of 1:1, and adding a sodium hexametaphosphate dispersant accounting for 0.3-2.0% of the dry basis mass of the pulp to prepare the pulp with the solid content of 50-52%.
(3) And (3) wet superfine grinding: feeding the slurry into wet-process ore grinding equipment, controlling the flow to be 1 ton/hour, grinding the slurry with the average particle size of 0.2 mu m, removing mechanical iron impurities and magnetic substances in minerals by using an iron removal facility, and removing organic and inorganic large particles and impurities in the ore pulp by using impurity removal equipment to prepare the ore pulp with the content of 500-mesh residues being less than 0.010 percent, namely 1# semi-finished product slurry;
(4) drying and scattering before burning: and (3) conveying the 1# semi-finished product slurry to a drying tower for dehydration and drying, controlling the temperature of tail gas of the drying tower to be 110-120 ℃, drying the slurry into powder with the moisture content of less than 1%, smashing conglomerate particles formed in the drying process through a breaker, and simultaneously discharging impurities with large hardness and coarse particles in the breaking process to prepare the pre-calcination powder with the average particle size of 0.3 micron.
(5) Calcining and scattering the powder, namely calcining the powder before the powder with the average particle size of 0.3 micron in a kiln, controlling the calcining temperature to be 1000-1100 ℃, the calcining time to be 1 hour and the heating rate to be 8-9 ℃ per minute, and obtaining the spinel/mullite calcined kaolin after calcining. After ventilation and cooling, the conglomerate particles formed in the calcining process are broken up to obtain spinel/mullite calcined kaolin powder, and the average particle size of the clinker powder is 0.8 micron.
(6) Pulping by using clinker: the spinel/mullite calcined kaolin powder is prepared into No. 2 calcined slurry by adding water according to 50 percent of solid content to prepare slurry.
(7) Mixing raw slurry and clinker slurry: uniformly mixing the 1# semi-finished product raw slurry and the 2# clinker slurry according to the mass ratio of 1:1, and adding a water glass binder accounting for 1% of the dry basis mass of the mixed slurry.
(8) Drying and balling: the mixed slurry is made into microspheres with uniform particle size after spray drying. Spray drying to control water content to be less than 1% and control particle size of the microsphere to be 60-80 μm;
(9) and (3) calcining the microspheres: and calcining the microspheres in a kiln, controlling the calcining temperature to be 800-900 ℃, the calcining time to be 1 hour, the heating rate to be 6-7 ℃ per minute, and removing the ultrafine particles smaller than 40 micrometers after calcining and cooling to obtain the binary composite active catalytic cracking catalyst precursor.
The preparation process of the binary composite active catalytic cracking catalyst precursor comprises the following steps: coal gangue raw ore → crushing → grinding → pulping → wet grinding → 1# semi-finished product raw slurry; 1# semi-finished product raw slurry → spray drying → scattering → 1000-; semi-finished product No. 1 raw slurry and finished product No. 2 cooked slurry → mixing → spray drying → microspheres → calcining → sieving.
Through detection, the performance of the petroleum catalytic cracking catalyst microsphere product prepared by utilizing the coal gangue is as follows: the acid reaction activity is 23, the strength is 13, the requirements of the subsequent crystallization process can be met, and the added value of a ton product is increased by 2200 yuan.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.
Claims (2)
1. A method for preparing a binary composite catalytic cracking molecular sieve precursor by utilizing coal gangue is characterized by comprising the following steps: grinding and calcining the coal gangue to generate spinel/mullite kaolin powder, preparing slurry again, mixing the slurry with the coal gangue ore pulp which is not calcined in proportion, adding a binder, performing spray drying to generate microspheres with a certain particle size, and calcining at low temperature to prepare the catalytic cracking catalyst precursor.
2. The method for preparing the binary composite catalytic cracking molecular sieve precursor by using the coal gangue as claimed in claim 1, wherein the method comprises the following steps: the method comprises the following specific steps:
(1) crushing: crushing raw coal gangue into raw coal gangue powder, crushing the raw coal gangue powder into raw coal gangue powder, and crushing the coal gangue powder to a particle size of less than or equal to 30 mm by using a hammer crusher in primary crushing; the second-stage crushing adopts a hurricane mill, and the coal gangue is crushed to a particle size of less than or equal to 45 microns;
(2) pulping raw material powder and grinding: taking coal gangue raw powder with the particle size of less than or equal to 45 micrometers, adding water into a pulping tank for pulping, mixing the coal gangue raw powder and the water according to the mass ratio of 1:1, adding a sodium hexametaphosphate dispersing agent accounting for 0.3-2.0% of the dry basis mass of the pulp to prepare pulp with the solid content of 50% -52%, feeding the pulp into wet grinding equipment for superfine grinding, controlling the flow rate to be 1 ton/hour, grinding to prepare the pulp with the average particle size of 0.2 mu m, removing mechanical iron impurities and magnetic substances in minerals by using an iron removal facility, removing organic and inorganic large particles and impurities in the pulp by using impurity removal equipment, and preparing the pulp with the 500-mesh screen residue content of less than 0.010%, namely 1# semi-finished raw pulp;
(3) drying and scattering before burning, namely conveying the 1# semi-finished product raw slurry to a drying tower for dehydration and drying, controlling the temperature of tower tail gas to be 110-120 ℃, drying the raw slurry into powder with the moisture content of less than 1%, smashing conglomerated particles formed in the drying process through a scattering machine, and simultaneously discharging impurities with large hardness and coarse particles in the scattering process to prepare powder before burning with the average particle size of 0.3 micron;
(4) calcining and scattering after firing: putting the powder into a kiln for calcination before calcination, controlling the calcination temperature to be 1000-1100 ℃, the calcination time to be 1 hour, and the heating rate to be 8-9 ℃ per minute, and obtaining spinel/mullite calcined kaolin after calcination;
after ventilation and cooling, crushing the coalescent particles formed in the calcining process to obtain calcined kaolin powder with the average particle size of 0.8 micron;
(4) single clinker pulping, mixing raw slurry and single clinker slurry, drying the mixed slurry to form balls, and calcining microspheres: adding water into the obtained calcined kaolin powder with the average particle size of 0.8 micron according to 50 percent of solid content to prepare single-cooked slurry, so as to prepare No. 2 clinker slurry; uniformly mixing the No. 1 raw slurry and the No. 2 clinker slurry according to the mass ratio of 1:1, adding a sodium silicate binder accounting for 1% of the dry basis mass of the mixed slurry, and performing spray drying to prepare microspheres with uniform particle size, wherein the moisture content is controlled to be less than 1% by spray drying, and the particle size of the microspheres is controlled to be 60-80 microns; then calcining the mixture in a kiln, controlling the calcining temperature to be 800-900 ℃, the calcining time to be 1 hour, and the heating rate to be 6-7 ℃ per minute, and removing the ultrafine particles smaller than 40 micrometers to obtain the binary composite active catalytic cracking catalyst precursor.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114192556A (en) * | 2022-01-06 | 2022-03-18 | 中国矿业大学(北京) | Coal gangue roasting iron-removing whitening method and whitening coal gangue material prepared by same |
| CN115818656A (en) * | 2022-11-10 | 2023-03-21 | 李玉杰 | Method for producing mullite powder by microwave heating of coal gangue |
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| CN102963908A (en) * | 2012-11-29 | 2013-03-13 | 中国科学院过程工程研究所 | Method for preparing ZSM-5 molecular sieve without template agent |
| CN107021501A (en) * | 2017-05-04 | 2017-08-08 | 山西晋坤矿产品股份有限公司 | A kind of method that gangue prepares high oil absorption value calcined kaolin |
| CN110526258A (en) * | 2018-05-24 | 2019-12-03 | 中国石油天然气股份有限公司 | A kind of NaY molecular sieve microsphere and its in-situ synthetic method |
| CN108975348A (en) * | 2018-09-05 | 2018-12-11 | 中国神华能源股份有限公司 | A kind of method of production of 4 A molecular sifter |
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| CN114192556A (en) * | 2022-01-06 | 2022-03-18 | 中国矿业大学(北京) | Coal gangue roasting iron-removing whitening method and whitening coal gangue material prepared by same |
| CN115818656A (en) * | 2022-11-10 | 2023-03-21 | 李玉杰 | Method for producing mullite powder by microwave heating of coal gangue |
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| CN112588282B (en) | 2021-08-31 |
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