CN111925816A - Production method of low CTE coal-series needle coke - Google Patents
Production method of low CTE coal-series needle coke Download PDFInfo
- Publication number
- CN111925816A CN111925816A CN202010713695.3A CN202010713695A CN111925816A CN 111925816 A CN111925816 A CN 111925816A CN 202010713695 A CN202010713695 A CN 202010713695A CN 111925816 A CN111925816 A CN 111925816A
- Authority
- CN
- China
- Prior art keywords
- needle coke
- coal
- fractionating tower
- tower
- calcination
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 239000011331 needle coke Substances 0.000 title claims abstract description 28
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 24
- 238000001354 calcination Methods 0.000 claims abstract description 42
- 238000004939 coking Methods 0.000 claims abstract description 34
- 238000010438 heat treatment Methods 0.000 claims abstract description 32
- 239000002994 raw material Substances 0.000 claims abstract description 28
- 239000012159 carrier gas Substances 0.000 claims abstract description 25
- 238000001816 cooling Methods 0.000 claims abstract description 25
- 239000011311 coal-based needle coke Substances 0.000 claims abstract description 23
- 239000007789 gas Substances 0.000 claims abstract description 14
- 239000000571 coke Substances 0.000 claims abstract description 13
- 239000011280 coal tar Substances 0.000 claims abstract description 11
- 239000000203 mixture Substances 0.000 claims abstract description 10
- 239000011338 soft pitch Substances 0.000 claims abstract description 10
- 239000010724 circulating oil Substances 0.000 claims abstract description 9
- 239000003921 oil Substances 0.000 claims abstract description 9
- 238000000034 method Methods 0.000 claims description 6
- 230000005855 radiation Effects 0.000 claims description 4
- 239000011261 inert gas Substances 0.000 claims description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 2
- -1 steam Substances 0.000 claims 1
- 238000002360 preparation method Methods 0.000 abstract description 5
- 239000002010 green coke Substances 0.000 abstract description 3
- 238000006467 substitution reaction Methods 0.000 description 3
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical group [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 239000011329 calcined coke Substances 0.000 description 2
- 239000003575 carbonaceous material Substances 0.000 description 2
- 238000001514 detection method Methods 0.000 description 2
- 230000002349 favourable effect Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 229920000049 Carbon (fiber) Polymers 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 239000004917 carbon fiber Substances 0.000 description 1
- 239000007841 coal based oil Substances 0.000 description 1
- 239000011300 coal pitch Substances 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 239000000295 fuel oil Substances 0.000 description 1
- 125000005842 heteroatom Chemical group 0.000 description 1
- 238000003837 high-temperature calcination Methods 0.000 description 1
- 239000011229 interlayer Substances 0.000 description 1
- 239000013081 microcrystal Substances 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 239000003208 petroleum Substances 0.000 description 1
- 239000002006 petroleum coke Substances 0.000 description 1
- 239000011310 petroleum-based needle coke Substances 0.000 description 1
- 230000008707 rearrangement Effects 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10B—DESTRUCTIVE DISTILLATION OF CARBONACEOUS MATERIALS FOR PRODUCTION OF GAS, COKE, TAR, OR SIMILAR MATERIALS
- C10B55/00—Coking mineral oils, bitumen, tar, and the like or mixtures thereof with solid carbonaceous material
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Coke Industry (AREA)
Abstract
The invention belongs to the technical field of needle coke preparation, and particularly relates to a production method of low CTE coal-based needle coke, which comprises the following steps: the coal tar soft pitch enters a needle coke raw material groove, is pumped out by a pump, is heated by a raw material heating furnace and then enters a fractionating tower; heating carrier gas in a carrier gas heating furnace and then feeding the heated carrier gas into a fractionating tower; the coal tar soft pitch entering the fractionating tower exchanges heat with carrier gas, circulating oil in the fractionating tower is pumped out from the bottom of the fractionating tower by a pump and sent to a raw material heating furnace for heating, then enters a coking tower A or a coking tower B which alternately operates, generated oil gas enters the fractionating tower, and green coke is obtained at the bottom; putting the raw coke into a rotary kiln for primary calcination, and performing primary cooling after the calcination; and after cooling, the mixture enters a rotary kiln for secondary calcination, and after calcination, the mixture is cooled for the second time to obtain the finished needle coke. The whole coking production of the invention is more stable, and compared with the coal-based needle coke produced by the traditional production method, the CTE value of the coal-based needle coke of the invention is reduced by 5-10%.
Description
Technical Field
The invention belongs to the technical field of needle coke preparation, and particularly relates to a production method of low CTE coal-based needle coke.
Background
The needle coke is a high-quality variety developed greatly in carbon materials, has optical anisotropy and a good streamline needle-shaped crystalline carbon structure, and the particles of the needle coke are slender after being crushed, so that the needle coke is mainly used as a raw material for producing high-end carbon products such as ultrahigh-power electrodes, special carbon materials, carbon fibers and composite materials thereof. The needle coke is divided into coal-based needle coke and oil-based needle coke according to the difference of raw materials for producing the needle coke, the needle coke produced by taking heavy oil generated by secondary processing of petroleum as the raw material is called petroleum-based needle coke, and the needle coke produced by taking coal tar heavy fraction and coal pitch as the raw materials is called coal-based needle coke.
In the prior art of the prior art for preparing coal-based needle coke, most of the oil gas in the front tower is used for preheating coking, and the oil gas is supposed to enter the fractionating tower and provide heat for the fractionating tower, but if the oil gas is preheated in the coking tower, the amount of the oil gas entering the fractionating tower is reduced, so that the heat balance of the fractionating tower is damaged, and the operation of the fractionating tower is fluctuated.
For the calcination of petroleum coke, the conventional rotary kiln calcination process is as follows: the green coke is quickly fed into the kiln body at 1200 deg.C from normal temp. by means of feeding slide pipe, and its time only needs several seconds, then it is rotated along with kiln body, and reaches calcining zone, and continuously transferred to kiln head, and fed into cooling kiln, and the water is sprayed in the cooling kiln to directly cool it. The traditional rotary kiln calcination has the problems of low yield of needle coke, such as the yield of 70-75 percent, poor granularity of calcined coke and the like.
In addition, the preparation process of the coal-based needle coke of each manufacturer belongs to a confidential state or is protected by a patent, and the preparation cost is relatively high, the yield is relatively low, so that the preparation process is not beneficial to the current intense market competition.
Disclosure of Invention
The invention provides a method for producing low CTE coal-series needle coke, aiming at the problems that the pressure and temperature of a fractionating tower are easy to fluctuate, the collection rate of the coal-series needle coke is low, and the granularity of calcined coke is poor in the prior art.
The invention provides a production method of low CTE coal-series needle coke, comprising the following steps:
a. the refined coal tar soft pitch enters a needle coke raw material tank, is pumped out by a pump, is heated by a convection section at the upper part of a raw material heating furnace and then enters the bottom of a fractionating tower; heating carrier gas in a carrier gas heating furnace and then feeding the heated carrier gas into a fractionating tower;
b. the refined coal tar soft pitch entering the fractionating tower exchanges heat with carrier gas entering the fractionating tower, circulating oil at the bottom of the fractionating tower is pumped out from the bottom of the fractionating tower by a pump and is sent to a raw material heating furnace, the circulating oil is heated by a middle radiation section of the raw material heating furnace and then enters a coking tower A or a coking tower B, the coking tower A and the coking tower B alternately operate, generated oil gas enters the fractionating tower, and raw coke is obtained at the bottom of the fractionating tower;
c. putting the raw coke into a rotary kiln for primary calcination, and performing primary cooling after the calcination; and after cooling, the mixture enters the rotary kiln again for secondary calcination, and after calcination, the mixture is cooled for the second time to obtain the finished needle coke.
Further, the carrier gas is one of dry coking gas, steam and inert gas.
Further, the heating furnace is a gas furnace or an electric furnace.
Further, the primary cooling and the secondary cooling are both cooled in a built-in water-cooled wall mode.
Further, in the step a, the temperature of the raw material heating furnace is 450-550 ℃.
Further, in the step b, the temperature of the top of the fractionating tower is 150-; the temperature of the top of the coking tower A or B is 420-480 ℃, and the pressure of the top of the coking tower A or B is 0.2-1.0 MPa.
Further, in the step c, the indoor calcining temperature is 750-850 ℃ and the indoor pressure is-20 to-50 Pa when the rotary kiln is used for primary calcining; when the rotary kiln is used for secondary calcination, the indoor calcination temperature is 1350-; the discharge temperature after the secondary cooling is less than 80 ℃.
A low CTE coal-based needle coke produced by the above production processDensity > 2.13g/cm3。
The invention has the beneficial effects that:
compared with the prior art, the production method of the coal-based needle coke adds the carrier gas and the carrier gas heating furnace, the carrier gas is used for preheating the coking tower at the initial stage and controlling the heat treatment at the later stage of coke formation, the pressure and temperature fluctuation of the fractionating tower is reduced, the temperature fluctuation of the raw material fed into the coking tower is reduced, and the coking production is stabilized; compared with the one-time calcination in the prior art, the method provided by the invention has the advantages that the green coke is calcined twice, the first-stage medium-temperature calcination mainly removes volatile components, the first-stage cooling is favorable for the construction of a microcrystal basic structure, and the second-stage high-temperature calcination mainly removes partial heteroatoms, so that the rearrangement of the coke interlayer structure is favorable.
The coal-based needle coke obtained by the method has good coke granularity and the true density is more than 2.13g/cm3The CTE value is 0.6E-6/DEG C-1.1E-6/DEG C, compared with the coal-based needle coke produced by the traditional production method, the CTE value of the coal-based needle coke is reduced by 5-10%, and the technical requirement for manufacturing high-power electrodes is met.
Detailed Description
In order to make those skilled in the art better understand the technical solutions in the present invention, 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 only a part of the embodiments of the present invention, and 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.
Example 1
The production method of the low CTE coal-based needle coke provided by the embodiment of the invention comprises the following steps:
a. the refined coal tar soft pitch enters a needle coke raw material tank, is pumped out by a pump, is heated by a convection section at the upper part of a raw material heating furnace and then enters the bottom of a fractionating tower; and the carrier gas is heated by a carrier gas heating furnace and then enters the fractionating tower. Wherein the temperature of the raw material heating furnace is 500 ℃; the heating furnace is an electric furnace, and the carrier gas is coking dry gas.
b. The refined coal tar soft pitch entering the fractionating tower exchanges heat with the carrier gas entering the fractionating tower, the circulating oil at the bottom of the fractionating tower is pumped out from the bottom of the fractionating tower by a pump and is sent to the raw material heating furnace, the circulating oil is heated by the middle radiation section of the raw material heating furnace and then enters the coking tower A or the coking tower B, the coking tower A and the coking tower B alternately operate, the generated oil gas enters the fractionating tower, and the raw coke is obtained at the bottom. Wherein the top temperature of the fractionating tower is 180 ℃, and the top pressure of the fractionating tower is 0.4 MPa; the temperature of the top of the coking tower A or B is 450 ℃, and the pressure of the top of the coking tower A or B is 0.7 MPa.
c. Putting the raw coke into a rotary kiln for primary calcination, and performing primary cooling after the calcination; and after cooling, the mixture enters the rotary kiln again for secondary calcination, and after calcination, the mixture is cooled for the second time to obtain the finished needle coke. Wherein, the indoor calcining temperature is 790 ℃ and the indoor pressure is-30 Pa during the primary calcining of the rotary kiln; when the rotary kiln is used for secondary calcination, the indoor calcination temperature is 1380 ℃, and the indoor pressure is-13 Pa; the primary cooling and the secondary cooling are both cooled in a built-in water-cooled wall mode, and the discharge temperature after the secondary cooling is 75 ℃.
The low CTE coal-series needle coke prepared by the production method has the true density of 2.14g/cm through detection3The CTE value is 0.8E-6/DEG C, the technical index of the superior coal-based needle coke is met, and the technical requirement for manufacturing a high-power electrode is met.
Example 2
The production method of the low CTE coal-based needle coke provided by the embodiment of the invention comprises the following steps:
a. the refined coal tar soft pitch enters a needle coke raw material tank, is pumped out by a pump, is heated by a convection section at the upper part of a raw material heating furnace and then enters the bottom of a fractionating tower; and the carrier gas is heated by a carrier gas heating furnace and then enters the fractionating tower. Wherein the temperature of the raw material heating furnace is 490 ℃; the heating furnace is an electric furnace, and the carrier gas is steam.
b. The refined coal tar soft pitch entering the fractionating tower exchanges heat with the carrier gas entering the fractionating tower, the circulating oil at the bottom of the fractionating tower is pumped out from the bottom of the fractionating tower by a pump and is sent to the raw material heating furnace, the circulating oil is heated by the middle radiation section of the raw material heating furnace and then enters the coking tower A or the coking tower B, the coking tower A and the coking tower B alternately operate, the generated oil gas enters the fractionating tower, and the raw coke is obtained at the bottom. Wherein the temperature at the top of the fractionating tower is 200 ℃, and the top pressure of the fractionating tower is 0.3 MPa; the top temperature of the coking tower A or B is 460 ℃, and the top pressure of the coking tower A or B is 0.6 MPa.
c. Putting the raw coke into a rotary kiln for primary calcination, and performing primary cooling after the calcination; and after cooling, the mixture enters the rotary kiln again for secondary calcination, and after calcination, the mixture is cooled for the second time to obtain the finished needle coke. Wherein, the indoor calcining temperature is 800 ℃ and the indoor pressure is-35 Pa during the primary calcining of the rotary kiln; when the rotary kiln is used for secondary calcination, the indoor calcination temperature is 1400 ℃, and the indoor pressure is-15 Pa; the primary cooling and the secondary cooling are both cooled in a built-in water-cooled wall mode, and the discharge temperature after the secondary cooling is 78 ℃.
The low CTE coal-series needle coke prepared by the production method has the true density of 2.14g/cm through detection3The CTE value is 0.9E-6/DEG C, the technical index of the superior coal-based needle coke is met, and the technical requirement for manufacturing a high-power electrode is met.
Although the present invention has been described in detail by way of preferred embodiments, the present invention is not limited thereto. Various equivalent modifications or substitutions can be made on the embodiments of the present invention by those skilled in the art without departing from the spirit and the spirit of the present invention, and these modifications or substitutions are within the scope of the present invention/any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (8)
1. A method for producing low CTE coal-based needle coke, characterized by comprising the following steps:
a. the refined coal tar soft pitch enters a needle coke raw material tank, is pumped out by a pump, is heated by a convection section at the upper part of a raw material heating furnace and then enters the bottom of a fractionating tower; heating carrier gas in a carrier gas heating furnace and then feeding the heated carrier gas into a fractionating tower;
b. the refined coal tar soft pitch entering the fractionating tower exchanges heat with carrier gas entering the fractionating tower, circulating oil at the bottom of the fractionating tower is pumped out from the bottom of the fractionating tower by a pump and is sent to a raw material heating furnace, the circulating oil is heated by a middle radiation section of the raw material heating furnace and then enters a coking tower A or a coking tower B, the coking tower A and the coking tower B alternately operate, generated oil gas enters the fractionating tower, and raw coke is obtained at the bottom of the fractionating tower;
c. putting the raw coke into a rotary kiln for primary calcination, and performing primary cooling after the calcination; and after cooling, the mixture enters the rotary kiln again for secondary calcination, and after calcination, the mixture is cooled for the second time to obtain the finished needle coke.
2. The method of claim 1, wherein the carrier gas is one of dry coke gas, steam, and inert gas.
3. The method of claim 1, wherein said furnace is a gas furnace or an electric furnace.
4. The method of claim 1, wherein the primary cooling and the secondary cooling are both cooled by built-in water walls.
5. The method for producing low CTE coal-based needle coke as claimed in claim 1, wherein the temperature of the raw material heating furnace in the step a is 450 ℃ to 550 ℃.
6. The method for producing coal-based needle coke with low CTE according to claim 1, wherein in the step b, the temperature at the top of the fractionating tower is 150 ℃ and 200 ℃, and the pressure at the top of the fractionating tower is 0.1-0.5 MPa; the temperature of the top of the coking tower A or B is 420-480 ℃, and the pressure of the top of the coking tower A or B is 0.2-1.0 MPa.
7. The method for producing coal-based needle coke with low CTE according to claim 1, wherein in the step c, the indoor calcining temperature is 750-850 ℃ and the indoor pressure is-20 to-50 Pa during the primary calcining in the rotary kiln; when the rotary kiln is used for secondary calcination, the indoor calcination temperature is 1350-; after secondary cooling, the discharge temperature is less than 80 ℃.
8. The low CTE coal-based needle coke produced by the production process of claim 1, wherein the coal-based needle coke has a true density of > 2.13g/cm3。
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010713695.3A CN111925816A (en) | 2020-07-22 | 2020-07-22 | Production method of low CTE coal-series needle coke |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010713695.3A CN111925816A (en) | 2020-07-22 | 2020-07-22 | Production method of low CTE coal-series needle coke |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN111925816A true CN111925816A (en) | 2020-11-13 |
Family
ID=73314296
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010713695.3A Pending CN111925816A (en) | 2020-07-22 | 2020-07-22 | Production method of low CTE coal-series needle coke |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN111925816A (en) |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1290234A (en) * | 1969-05-26 | 1972-09-20 | ||
| CN1145089A (en) * | 1994-04-07 | 1997-03-12 | 新日铁化学株式会社 | Needle coke for graphite electrode and production method thereof |
| CN101254444A (en) * | 2007-12-05 | 2008-09-03 | 南京大学 | A catalytic reaction, rectification integrated process and its special equipment |
| CN101724419A (en) * | 2008-10-28 | 2010-06-09 | 中国石油化工股份有限公司 | Method for producing needle coke by utilizing delay coking of coal tar |
| CN104383704A (en) * | 2014-09-19 | 2015-03-04 | 燕山大学 | Step heating method and heating system for preheating of gas fractionating tower inlet material |
| CN105778957A (en) * | 2014-12-17 | 2016-07-20 | 上海宝钢化工有限公司 | Charring method for coal-based needle coke production |
| CN106635102A (en) * | 2016-12-09 | 2017-05-10 | 山东益大新材料有限公司 | Process for producing negative electrode material coke by taking supercritical extraction oil slurry as raw material and application of process |
| CN108587661A (en) * | 2018-07-09 | 2018-09-28 | 鞍山兴德工程技术有限公司 | A kind of device and method preparing needle coke based on delay coking process |
-
2020
- 2020-07-22 CN CN202010713695.3A patent/CN111925816A/en active Pending
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1290234A (en) * | 1969-05-26 | 1972-09-20 | ||
| CN1145089A (en) * | 1994-04-07 | 1997-03-12 | 新日铁化学株式会社 | Needle coke for graphite electrode and production method thereof |
| CN101254444A (en) * | 2007-12-05 | 2008-09-03 | 南京大学 | A catalytic reaction, rectification integrated process and its special equipment |
| CN101724419A (en) * | 2008-10-28 | 2010-06-09 | 中国石油化工股份有限公司 | Method for producing needle coke by utilizing delay coking of coal tar |
| CN104383704A (en) * | 2014-09-19 | 2015-03-04 | 燕山大学 | Step heating method and heating system for preheating of gas fractionating tower inlet material |
| CN105778957A (en) * | 2014-12-17 | 2016-07-20 | 上海宝钢化工有限公司 | Charring method for coal-based needle coke production |
| CN106635102A (en) * | 2016-12-09 | 2017-05-10 | 山东益大新材料有限公司 | Process for producing negative electrode material coke by taking supercritical extraction oil slurry as raw material and application of process |
| CN108587661A (en) * | 2018-07-09 | 2018-09-28 | 鞍山兴德工程技术有限公司 | A kind of device and method preparing needle coke based on delay coking process |
Non-Patent Citations (1)
| Title |
|---|
| 陈绍洲、常可怡 编著: "《石油加工工艺学》", 31 December 1997, 华东理工大学出版社 * |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| RU2470868C2 (en) | Method of producing titanium tetrachloride using low-quality titanium raw materials | |
| CN101418383B (en) | A kind of method that TiCl4 is prepared from titanium-containing slag | |
| CN110066675B (en) | Method for continuously producing high-quality needle coke | |
| CN111440976A (en) | Vanadium-nitrogen alloy and production method thereof | |
| CN110093504A (en) | A kind of method and system using high calcium-magnesium-titanium heading preparation rich-titanium material | |
| CN106916599A (en) | A kind of iron coke process units and method | |
| CN111925816A (en) | Production method of low CTE coal-series needle coke | |
| CN104526189A (en) | Method for reducing ilmenite through microwave composite reducing agents and preparing electrode coatings | |
| CN108585858A (en) | A kind of preparation process of composite graphite electrode | |
| CN104593015A (en) | Formcoke refining method and device thereof | |
| CN101774553B (en) | Method for calcining raw materials in furnace in yellow phosphorus production | |
| CN106283117B (en) | A kind of preparation method of anode carbon block for electrolytic aluminum | |
| CN103979981A (en) | A large-size semi-graphite silicon carbide carbon brick and a production process thereof | |
| CN111486702A (en) | Needle coke two-stage calcination coupling flue gas internal circulation method and device | |
| CN106115687A (en) | Method is not melted in the oxidation of flow-type bitumen ball | |
| CN102445075B (en) | A kind of Medium frequency induction roaster heat energy recovering method and device | |
| CN109439353B (en) | Coking and calcining integrated process for preparing needle coke from refined asphalt | |
| CN106219584B (en) | The device and method of alpha-aluminium oxide content in a kind of reduction metallurgical-grade aluminum oxide | |
| CN110408418B (en) | Preparation method of high-regular-carbon microcrystalline pitch coke | |
| KR101662724B1 (en) | Method for producing metallic lithium | |
| CN108842107A (en) | A method of passing through sectional temperature-controlled raising VN alloy nitrogen content | |
| JP2520545B2 (en) | Manufacturing method of molding coke for metallurgy | |
| CN113004923B (en) | Subsequent treatment process for joint coking reaction | |
| CN206891154U (en) | A kind of high rotary kiln of thermal efficiency | |
| CN100462419C (en) | Process for preparing needle coke from coal tar soft pitch |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |