CN-117327505-B - Pretreatment method for producing needle coke raw material

Abstract

The invention discloses a pretreatment method for producing needle coke raw materials, which belongs to the technical field of chemical industry and comprises the following steps of S1, centrifuging, obtaining upper-layer centrifugate and lower-layer solid phase matters after the coal tar raw materials are treated by a centrifuge, S2, stirring, sending the centrifugate into a middle tank, adding an auxiliary agent, stirring, standing, S3, filtering and separating, pressurizing and filtering to obtain purified coal tar, S4, recycling, sending the solid phase matters into a mixing tank, adding a solvent, and distilling and recycling. The method has the advantages of saving resource consumption, avoiding the generation of waste and pollution risks, having good environmental protection value, realizing multi-station cooperation and good pretreatment effect, completely recycling separated impurities, reducing consumption and cost, increasing output and realizing yield and emission reduction.

Inventors

• HE PEIQIANG
• GUAN JIAN
• LIANG XIAOPENG
• SHENG KAI
• YANG ZHANYONG
• YANG SHUAIYUAN
• ZHANG GUOQI
• JI LIANGLIANG

Assignees

• 河南首成科技新材料有限公司

Dates

Publication Date

20260512

Application Date

20231127

Claims (4)

1. 1. A pretreatment method for producing needle coke raw material, characterized by comprising the steps of: s1, centrifuging, namely treating the coal tar raw material by a centrifuge to obtain upper-layer centrifugate and lower-layer solid phase matters; S2, stirring, namely sending the centrifugate into a middle tank, adding an auxiliary agent, stirring, and standing; s3, filtering and separating, and pressurizing and filtering to obtain purified coal tar; s4, recycling, namely sending the solid phase matters into a mixing tank, and recycling; In the step S1, the coal tar raw material is sent to a centrifuge after being subjected to pretreatment; The pretreatment comprises a settling tank process and a heating process which are sequentially arranged, wherein the coal tar raw material is subjected to standing settlement in the settling tank to remove large-particle insoluble substances, the temperature of the settling tank is 50-60 ℃, the settling tank is subjected to standing for 10-15 hours, and then the coal tar raw material is sent to a centrifugal machine through a heating pipeline; In the step S2, the auxiliary agent is inorganic flocculant and water, wherein the addition amount of the water is 30% -50% of that of the centrifugate; In step S3, the layered aqueous solution is discharged before filtration; adding water to dilute the coal tar, and mixing part of impurities in the coal tar into the water to further improve the purifying effect; in the step S4, the sediment in the sedimentation tank is sent into the mixing tank together so as to further realize the full utilization of the raw materials and increase the economic output; A water outlet (5) is arranged on the intermediate tank, and a transparent window (8) which is vertically arranged is arranged on the front side of the intermediate tank; The water outlet (5) is internally provided with a suction pipe which can vertically lift, the bottom end position of the suction pipe is adjusted according to different oil-water layering, and water is discharged; the filter element (7) is positioned at the inner bottom end and is in a pointed cone structure, the slag discharging port (3) is positioned at the outer edge lower end of the pointed cone structure, and the special designed structure is utilized to have larger filtering area and higher filtering efficiency, meanwhile, the accumulation and residue of residues are reduced, and the cleaning and maintenance are extremely convenient; The inner cleaning mechanism (10) comprises a plurality of high-pressure spray heads (101) which are distributed in a surrounding mode, the water outlet ends of the high-pressure spray heads face the upper surface of the filtering piece (7), and a plurality of annular pipes (102) which are distributed on the inner wall of the intermediate tank in a layered mode, water nourishing holes which face the inner wall are formed in the annular pipes (102), the cross section of each annular pipe (102) is of a semi-elliptical structure and is matched with the inner wall to form a flat bulge, adhesion and residue are not easy to occur on the annular pipes, and compared with a circular pipe, the structure is stronger in bearing capacity, more round, more reliable and easy to clean.
2. 2. The pretreatment method for needle coke raw material production according to claim 1, wherein in step S1, the temperature of the coal tar raw material fed into the centrifuge is 80 to 100 ℃; the centrifugal speed is 5000-6000 r/min, and the centrifugal time is 2-3 min.
3. 3. The pretreatment method for needle coke raw material production according to claim 1, wherein in step S3, the pressure is 1.5 to 1.8mpa and the mesh size of the filter screen is 200 to 300 mesh.
4. 4. The method for pretreating a raw material for producing needle coke according to claim 1, further comprising adding an inert shielding gas in step S3.

Description

Pretreatment method for producing needle coke raw material Technical Field The invention relates to the technical field of chemical industry, in particular to a pretreatment method for producing needle coke raw materials. Background The needle coke is a high-quality carbon raw material, and is mainly used for producing high-power graphite electrodes for electric furnace steelmaking, high-energy neutron moderating materials for lithium ion battery materials and the like. The needle coke production process comprises 3 working procedures of raw material pretreatment, delayed coking and calcination, wherein the raw material pretreatment has an important influence on the quality of the needle coke, and the control of the quinoline insoluble content and reasonable molecular weight distribution in the raw material is the key of the raw material pretreatment. The pretreatment can effectively remove QI, S and other miscellaneous elements in the raw materials, and improve the performance of the raw materials. The preparation method can effectively improve the preparation performance of the raw materials by matching a plurality of pretreatment modes, and lays a foundation for the subsequent preparation of high-performance needle coke. Disclosure of Invention The invention aims to provide a pretreatment method of needle coke raw materials, so that energy conservation and yield increase are realized while the pretreatment effect is ensured. In order to achieve the above purpose, the present invention adopts the following technical scheme: A pretreatment method for producing needle coke raw material, comprising the steps of: s1, centrifuging, namely treating the coal tar raw material by a centrifuge to obtain upper-layer centrifugate and lower-layer solid phase matters; S2, stirring, namely sending the centrifugate into a middle tank, adding an auxiliary agent, stirring, and standing; s3, filtering and separating, and pressurizing and filtering to obtain purified coal tar; S4, recycling, namely sending the solid phase matters into a mixing tank, and recycling. In some embodiments, in step S1, the coal tar feedstock is pretreated and fed to a centrifuge; wherein, the preamble treatment comprises a settling tank procedure and a heating procedure which are sequentially arranged; specifically, the coal tar raw material is placed in a settling tank for settling to remove large-particle insoluble substances, and then is sent into a centrifuge through a heating pipeline. In some embodiments, in step S1, the temperature of the settling tank is 50-60 ℃, and the settling tank is kept stand for 10-15 hours. In some embodiments, in step S1, the settling tank is provided in plurality, each settling tank being independently connected to the centrifuge. In some embodiments, further comprising: in step S4, the sediment in the settling tank is fed into the mixing tank. In some embodiments, in step S1, the temperature of the coal tar feedstock fed into the centrifuge is 80-100 ℃; the centrifugal speed is 5000-6000 r/min, and the centrifugal time is 2-3 min. In some embodiments, in step S2, the adjuvant is an inorganic flocculant; Wherein the addition amount of the inorganic flocculant is 2% -5% of the centrifugate. In some embodiments, in step S2, the adjunct further comprises water; wherein the addition amount of water is 30% -50% of the centrifugal liquid; In step S3, the layered aqueous solution is discharged before filtration. In some embodiments, in step S3, the filter screen is 200-300 mesh, and the pressure is 1.5-1.8 MPa. In some embodiments, the middle tank is provided with an inlet positioned at an upper position, an outlet positioned at a lower position, a slag discharging port, an air inlet pressurizing port positioned at an upper position and a water outlet; a stirring piece and a filtering piece are arranged in the middle tank; a transparent window which is vertically arranged is arranged on the front side of the middle tank; one or more auxiliary agent adding ports are arranged above the middle tank; The stirring piece adopts a motor-driven stirring shaft mode, and the filtering piece is positioned at the inner bottom end position; A suction pipe capable of vertically lifting is arranged in the water outlet; the water outlet is of a straight pipe structure vertically arranged above the middle tank, and the suction pipe is a straight pipe with depth scales arranged on the outer side; The filtering piece is of a pointed cone structure, and the slag discharging port is positioned at the lower end position of the outer edge of the pointed cone structure The slag discharging holes are arranged in a surrounding mode, and extend outwards in an inclined mode to form guide holes; the outer side of the stirring shaft is provided with a stirring support rod and a spiral; the lower end of the stirring piece is provided with a cleaning piece matched with the upper surface of the filtering piece; the cleaning piece comprises an extension