A high mineral matter catalytic index russia fat coal involved briquetting coal, coke and preparation method

Abstract

The application discloses a kind of high mineral catalytic index's Russian fat coal participates in the preparation method of mixed coal, coke, belongs to coal blending coking technical field.The mixed coal includes gas coal 15%~20%, gas fat coal 5%~10%, fat coal 10%~36%, coking coal 25%~55%, lean coal 10%~14%, wherein, the fat coal includes 5%~20% Russian fat coal, the Russian fat coal: bonding index G: 90~100, maximum thickness Y of gel layer: 25~30mm, mineral catalytic index MCI: 6.0%~8.0%, dry ash-free base volatile Vdaf: 34%~39%.Russian fat coal is replaced part of fat coal, gas fat coal is applied to coal blending coking, and its proportion of use is improved, and the use range of coking coal is expanded, so that imported coking coal resources are fully optimized.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of coal blending for coking, and more particularly to a blended coal involving a Russian fat coal with a high mineral matter catalytic index, coke and a preparation method. BACKGROUND

[0002] About half of the world's exploitable reserves of coking coal resources are distributed in the Asian region, 1 / 4 in North America, and the remaining 1 / 4 in other regions. From the perspective of coking coal resource reserves, China's coking coal resources account for about 25% of the world, and has a comparative advantage. However, in China's coking coal resources, the proportion of low metamorphic high volatile gas coal and 1 / 3 coking coal is relatively high, accounting for 45.73%; the proportion of strong coking coal is the second, accounting for 23.61%; the proportion of lean coal (including lean coal) is 15.89%; and the proportion of strong coking coal (including gas fat coal) is relatively the lowest, accounting for 12.81%. In recent years, the exploitable amount of high-quality fat coal resources in China has been shrinking, and the price has been rising. In order to expand the procurement channel of fat coal, stabilize the quality of coke, and reduce the cost of coal blending, domestic coking enterprises have continuously increased the proportion of imported fat coal in the coal blending structure. China's imported fat coal mainly comes from Russia, Indonesia, Australia and other countries. However, due to the different coal-forming environments in different regions, although the volatile matter and caking property indexes meet the classification standards of domestic fat coal, their coking characteristics and geological characteristics have their own characteristics, which to some extent restricts the efficient and reasonable application of imported fat coal resources.

[0003] The paper "Russian low-sulfur fat coal coking practice" analyzes the properties and application of Russian low-sulfur fat coal. When the volatile matter of Russian fat coal is more than 33%, and the blending ratio is less than 5%, there is no obvious influence on the cold and hot strength of coke; when the blending ratio exceeds 7%, the hot strength of coke is significantly deteriorated.

[0004] After searching, patent CN102533299A discloses a method for blending Russian fat coal for coking, which comprises the step of mixing each single coking coal. The single coking coal used and its weight percentage are as follows: gas coal: 0-6%; Russian fat coal: 8%-12%; 1 / 3 coking coal with G>85: 15%-18%; 1 / 3 coking coal with G<85: 12%-15%; coking coal with G>85: 15%-20%; coking coal with G<85: 20%; lean coal: 15%-20%. The volatile matter of Russian fat coal in the patent is between 33% and 35%, and the Y value is >38 mm; the caking index G value is >100. The influence of ash content, i.e. mineral matter catalytic index, on the deterioration of coke thermal properties is not considered in the coal blending scheme.

[0005] Patent CN116103056A discloses a kind of coke with Russian coal and its production method, Russian coal is mixed with other coking coal as follows: Russian coal 15%~20%, lean coal 20%~35%, lean coal 0~15%, 1 / 3 coking coal 15%~25%, gas coal 0~18%, fat coal 5~25%, coking coal 0~15%; The quality index of mixed coal meets the following requirements: active ratio 1.0~1.4, MCI value ≤4, G value ≥60. Among them, Russian coal meets the index: volatile matter 28%~40%, G value ≥90, produce coke CRI ≤28%, CSR ≥64%. The patent uses two sides of furnace wall heating method to refine coke, the CSR index of the produced coke has large error with the real coke quality, the coke oven is 5.5m jolted coke oven, the coal blending scheme is not suitable for 7m top-charging coke oven, and the catalytic index MCI does not consider the influence of BaO and MnO on coke CSR. SUMMARY

[0006] 1. Problem to be solved

[0007] In view of the problem that the high amount of Russian fat coal mixed in existing coking coal leads to low CSR of coking coal after reaction, the present application provides a mixed coal with high mineral catalytic index of Russian fat coal, and the coking coal prepared by using the mixed coal has high CSR after reaction.

[0008] 2. Technical scheme

[0009] To solve the above problems, the technical scheme adopted by the present application is as follows:

[0010] The average random reflectance and distribution histogram of vitrinite, the caking index G, the maximum thickness Y of colloid layer and the mineral catalytic index MCI of Russian fat coal are determined.

[0011]

[0012] The specific coal quality index of the Russian fat coal with high mineral catalytic index is: average maximum reflectance of vitrinite Rran 0.92%~1.04%, caking index G 90~100, maximum thickness Y of colloid layer 25~30mm, mineral catalytic index MCI 6.0%~8.0%, dry ash-free basis volatile matter Vdaf 34%~39%, sulfur content St,d 0.20%~0.50%, and CSR of 40kg small coke oven coking coal 50%~56%. Among them, the caking index G, the maximum thickness Y of colloid layer and the mineral catalytic index MCI of the coal affect the CSR of coal blending.

[0013] By studying the fluidity of single coal, it is found that the mineral matter catalytic index MCI of Russian fat coal is relatively high, reaching 6.0% to 8.0%, which is significantly higher than the MCI of 1.5% to 4.5% of domestic fat coal, especially the high content of CaO and Fe2O3 in the ash component, which aggravates the coke dissolution reaction, the higher the MCI, the worse the strength, which leads to a significant reduction of the coke strength after reaction CSR. Therefore, the coal blending technology of the present application is targeted at the properties of Russian fat coal, and the optimized coking coal blending ratio is proposed through the study on the compatibility of different coking coals. According to the vitrinite random reflectance distribution diagram of Russian fat coal as shown in Figure 1 , it can be seen that a part of the coal crosses into the range of gas fat coal, accounting for 5% to 10%, so the coal not only replaces domestic fat coal, but also replaces part of gas fat coal to reduce the impact on the quality of blended coal. However, simple replacement will lead to an increase in the mineral matter catalytic index MCI of the blended coal, and further lead to the deterioration of the coke CSR index, which cannot meet the requirements of stable production of blast furnace. Therefore, the present application optimizes the coal blending by controlling the mineral matter catalytic index MCI, the caking index G and the maximum thickness Y of the gel layer of the blended coal, and the volatile matter, sulfur content and ash content, and the coke produced in the 7m top-charging coke oven can meet the quality requirements of high-quality metallurgical coke, and the coke strength after reaction CSR is greater than or equal to 68%, which meets the requirements of stable production of 3000m 3 above blast furnace.

[0014] The present application blends the coal according to the following quality percentage components: gas coal 15% to 20%, gas fat coal 5% to 10%, fat coal 1 # 0% to 5%, fat coal 2 # 5% to 11%, Russian fat coal 5% to 20%, coking coal 1 # 10% to 18%, coking coal 2 # 3% to 11%, coking coal 3 # 11% to 26%, and lean coal 10% to 14%. In the coal blending scheme, part of the domestic high-priced fat coal 1 # , fat coal 2 # and gas fat coal is replaced by low-priced Russian fat coal, and the proportion of high-priced coking coal 1 # and coking coal 2 # is adjusted at the same time, so that the mineral matter catalytic index MCI of the final blended coal is 2.5% to 3.0%, the caking index G value is 82 to 86, the maximum thickness Y of the gel layer is 16 to 18mm, and the ash content Ad is 9.00% to 10.00%. The above coal blending quality requirements are derived from the quality characteristics of Russian fat coal.

[0015] The coal quality indexes of each single coal are as follows:

[0016] Fat coal 1 #: Sulphur content St,d: 1.20%~1.60%, caking index G: 85~90, mineral catalytic index MCI: 3.0%~4.5%, dry ash-free basis volatile matter Vdaf: 32% or more, 40kg small coke oven furnace coking CSR: 58%~64%.

[0017] Fat coal 2 # : Sulphur content St,d: 0.30%~0.70%, caking index G: 90 or more, mineral catalytic index MCI: 1.5%~3.0%, dry ash-free basis volatile matter Vdaf: 32% or less, 40kg small coke oven furnace coking CSR: 70%~78%.

[0018] Gas fat coal: Sulphur content St,d: 0.30%~0.70%, caking index G: 85~90, mineral catalytic index MCI: 2.0%~2.5%, dry ash-free basis volatile matter Vdaf: 40% or more.

[0019] Russian fat coal: Sulphur content St,d: 0.20~0.50%, caking index G: 90~100, maximum thickness of gelatinous layer Y: 25~30mm, mineral catalytic index MCI: 6.0%~8.0%, dry ash-free basis volatile matter Vdaf: 34%~39%.

[0020] Coking coal 1 # : Sulphur content St,d: 0.55%~0.75%, caking index G: 85~90, mineral catalytic index MCI: 5.0%~6.0%.

[0021] Coking coal 2 # : Sulphur content St,d: 1.20%~1.50%, caking index G: 80~85, mineral catalytic index MCI: 1.0%~1.5%.

[0022] Coking coal 3 # : Sulphur content St,d: 1.40%~1.80%, caking index G: 85~90, mineral catalytic index MCI: 2.5%~3.5%.

[0023] Gas coal: caking index G: 75 or more; lean coal: caking index G: 40 or more.

[0024] Price order: Fat coal 2 # > Gas fat coal > Fat coal 1 # > Russian fat coal; Coking coal 1 # > Coking coal 2 # > Coking coal 3 # > Gas coal > Lean coal > Russian fat coal.

[0025] The mixed coal after blending needs to be crushed, and the mixed coal with particle size of 3mm or less accounts for 68% to 72% of the total mass. If the particle size is too small, the bonding performance is poor, and if the particle size is too large, the gap is large, which affects the strength of the coke. The mineral matter catalytic index MCI of the mixed coal after blending is 2.5% to 3.0%, the caking index G value is 82 to 86, the maximum thickness Y of the gel layer is 16 to 18mm, and the ash content Ad is 9.00% to 10.00%.

[0026] The crushed mixed coal is sent into a 7m top-charged coke oven for coking, and the standard temperatures of the machine side and the coke side are 1250±10℃ and 1300±10℃ respectively, and the coking time is 26±2 hours.

[0027] The dry quenching method is adopted to cool and discharge the coke. The coke quality is detected, and indexes such as coke crushing strength M40, wear resistance M10, coke reactivity CRI and post-reaction strength CSR are measured.

[0028] Compared with the prior art, the present application breaks the traditional idea of using Russian fat coal as fat coal, replaces part of the fat coal and gas fat coal with Russian fat coal for blending and coking, increases the blending ratio, expands the use range of coking coal, and optimizes the use of imported coking coal resources.

[0029] 3. Beneficial effects

[0030] Compared with the prior art, the beneficial effects of the present application are:

[0031] The present application uses Russian fat coal with high mineral matter catalytic index in the blended coal for blending, and the blending ratio of the Russian fat coal is 5% to 20%. The coke oven is 7m top-charged, and the post-reaction strength CSR of the obtained coke is ≥68%, and the coke quality meets the requirements of 3000m 3 The above requirements for stable production of blast furnaces. DETAILED DESCRIPTION

[0032] The technical solutions of the present application will be further described in detail below in combination with the drawings and examples, but it should be understood that these drawings are designed for explanatory purposes only, and therefore do not limit the scope of the present application.

[0033] Figure 1 The present application is a Russian fat coal vitrinite random reflectance distribution map. DETAILED DESCRIPTION

[0034] The following detailed description of example embodiments of the application references the drawings, which form a part thereof, and in which are shown by way of illustration example embodiments in which the application can be practiced. These embodiments are described in sufficient detail to enable those skilled in the art to practice the application, and it is to be understood that other embodiments can be utilized and that changes can be made without departing from the spirit and scope of the present application. The following detailed description is, therefore, not to be taken in a limiting sense, and the scope of the present application is defined only by the appended claims.

[0035] A method for coking by blending coal with a high mineral catalytic index Russian fat coal, comprising the following steps:

[0036] According to the current national standard determination method, the average random reflectance and distribution histogram of vitrinite, the caking index G, the maximum thickness of colloid layer Y, and the mineral catalytic index MCI of the Russian fat coal are determined.

[0037]

[0038] The specific coal quality indexes of the high mineral catalytic index Russian fat coal are as follows: the average maximum reflectance of vitrinite Rran is 0.92% to 1.04%, the caking index G is 90 to 100, the maximum thickness of colloid layer Y is 25 to 30 mm, the mineral catalytic index MCI is 6.0% to 8.0%, the dry ash-free basis volatile matter Vdaf is 34% to 39%, the sulfur content St,d is 0.20% to 0.50%, and the 40 kg small coke oven coking CSR is 50% to 56%.

[0039] The coal for production is selected and classified:

[0040] Fat coal 1 # : the sulfur content St,d is 1.20% to 1.60%, the caking index G is 85 to 90, the mineral catalytic index MCI is 3.0% to 4.5%, the dry ash-free basis volatile matter Vdaf is ≥ 32%, and the 40 kg small coke oven coking CSR is 58% to 64%.

[0041] Fat coal 2 # : the sulfur content St,d is 0.30% to 0.70%, the caking index G is ≥ 90, the mineral catalytic index MCI is 1.5% to 3.0%, the dry ash-free basis volatile matter Vdaf is ≤ 32%, and the 40 kg small coke oven coking CSR is 70% to 78%.

[0042] Gas-fat coal: sulfur content St,d: 0.30%~0.70%, caking index G: 85~90, mineral matter catalytic index MCI: 2.0%~2.5%, dry ash-free basis volatile matter Vdaf≥40%.

[0043] Russian fat coal: sulfur content St,d: 0.20%~0.50%, caking index G: 90~100, maximum thickness of gelatinous layer Y: 25~30mm, mineral matter catalytic index MCI: 6.0%~8.0%, dry ash-free basis volatile matter Vdaf: 34%~39%.

[0044] Coking coal 1 # : sulfur content St,d: 0.55%~0.75%, caking index G: 85~90, mineral matter catalytic index MCI: 5.0%~6.0%.

[0045] Coking coal 2 # : sulfur content St,d: 1.20%~1.50%, caking index G: 80~85, mineral matter catalytic index MCI: 1.0%~1.5%.

[0046] Coking coal 3 # : sulfur content St,d: 1.40%~1.80%, caking index G: 85~90, mineral matter catalytic index MCI: 2.5%~3.5%.

[0047] Gas coal: caking index G≥75; lean coal: caking index G≥40.

[0048] The coal blending is carried out in the following mass percentages: gas coal 15%~20%, gas-fat coal 5%~10%, fat coal 1 # 0%~5%, fat coal 2 # 5%~11%, Russian fat coal 5%~20%, coking coal 1 # 10%~18%, coking coal 2 # 3%~11%, coking coal 3 # 11%~26%, lean coal 10%~14%.

[0049] In the coal blending scheme, low-priced Russian fat coal is used to replace part of the domestic high-priced fat coal 1 # , fat coal 2 # and gas-fat coal, and at the same time, the proportions of high-priced coking coal 1 # , coking coal 2 # are adjusted, so that the mineral matter catalytic index MCI of the final blended coal is 2.5%~3.0%, the caking index G value is 82~86, the maximum thickness of the gelatinous layer Y is 16~19mm, the ash content Ad is 9.00%~10.00%, and the volatile matter Vdaf is 27%~29%.

[0050] The specific blending ratio of the coal is shown in Table 1. In scheme 1, no Russian fat coal is used; in scheme 2, 5% of Russian fat coal is used according to the present application; in scheme 3, 10% of Russian fat coal is used according to the present application; in scheme 4, 15% of Russian fat coal is used according to the present application; and in scheme 5, 20% of Russian fat coal is used according to the present application. The coke crushing strength M40 is 88%-89%, the abrasion resistance M10 is 5%-6%, and the coke reaction strength CSR is 68%-70% after coking in a 7m top-charged coke oven.

[0051] The mixed coal after blending needs to be crushed. The mixed coal is sent into a crusher by a belt, and the particle size of the mixed coal with a particle size of less than 3mm accounts for 68%-72% of the total mass of the mixed coal.

[0052] Coking is performed by blending the coal. The crushed mixed coal is sent into a 7m top-charged coke oven for coking, and the standard temperatures of the machine side and the coke side are 1250°C / 1300°C, respectively, and the coking time is 26 hours.

[0053] The dry quenching method is used to cool the coke. The coke quality is detected, and the coke crushing strength M40, the abrasion resistance M10, the coke reactivity CRI, and the coke reaction strength CSR are measured. The measurement results are shown in Table 1.

[0054] Table 1: Coking coal blending (mass percentage) and coke quality data of the present application

[0055]

[0056]

[0057] As can be seen from the five schemes in Table 1, the Russian fat coal replacement scheme of the present application is used in examples 1-4. The low-price Russian fat coal is used to replace part of the domestic high-price fat coal 1 # , fat coal 2 # , and gas fat coal, and the proportion of high-price coking coal 1 # and coking coal 2 # is adjusted synchronously. The quality data of the obtained coke is basically the same as the data measured in the comparative example 1 without using Russian fat coal, which achieves the purpose of reducing the cost of coal blending and stabilizing the quality of coke.

[0058] The method for participating in coal blending coking of the high-mineral catalytic index Russian fat coal of the present application breaks the traditional idea of using Russian fat coal as fat coal, applies Russian fat coal to coal blending coking instead of part of fat coal and gas fat coal, expands the range of coking coal, and optimizes the use of imported coking coal resources. Meanwhile, different mine fat coal and coking coal are subdivided, and the mineral catalytic index MCI, the caking index G and the maximum thickness Y of the gel layer of the blending coal, and the volatile matter, sulfur content and ash content are combined to optimize the coal blending, more use of low-price Russian fat coal, less use of high-price fat coal, gas fat coal and coking coal, to achieve the effect of reducing the cost of coal blending.

[0059] The above description is only a specific exemplary description of the present application, and it should be noted that the specific implementation of the present application is not limited by the above method, as long as various non-essential improvements are made by adopting the technical concept and technical scheme of the present application, or the technical concept and technical scheme of the present application are directly applied to other occasions without improvement, which are within the protection scope of the present application.

Claims

1. A blended coal containing Russian coking coal with a high mineral catalytic index, characterized in that, The composition includes 15%–20% gas coal, 5%–10% gas-rich coal, 10%–36% fat coal, 25%–55% coking coal, and 10%–14% lean coal. The fat coal includes 5%–20% Russian fat coal, which has the following characteristics: caking index G: 90–100, maximum plastic layer thickness Y: 25–30 mm, and mineral catalytic index MCI: 6.0%–8.0%. The Russian coking coal described has the following characteristics: average maximum reflectance (Rran) of vitrinite group: 0.92%~1.04%; sulfur content (St,d): 0.20%~0.50%; dry ash-free volatile matter (Vdaf): 34%~39%; and coke coke produced in a 40kg small coke oven has a CSR of 50%~56%. The blended coal has a mineral catalytic index (MCI) of 2.5%–3.0%, a caking index (G) of 82–86, a maximum plastic layer thickness (Y) of 16–18 mm, and an ash content (Ad) of 9.00%–10.00%. The fat coal includes fat coal 1 # 0%~5%, coking coal 2 # 5%–11%, wherein the coking coal includes coking coal 1 # 10%–18%, coking coal 2 # 3%–11%, coking coal 3 # 11%–26%; Coal Fertilizer 1 # Sulfur content (St,d): 1.20%~1.60%, caking index (G): 85~90, mineral catalytic index (MCI): 3.0%~4.5%, dry ash-free volatile matter (Vdaf) ≥32%, CSR of coke produced in a 40kg small coke oven: 58%~64%; Coal 2 # Sulfur content (St,d): 0.30%~0.70%, caking index (G) ≥ 90, mineral catalytic index (MCI): 1.5%~3.0%, dry ash-free volatile matter (Vdaf) ≤ 32%, CSR of coke produced in a 40kg small coke oven: 70%~78%; Gas-rich coal: Sulfur content (St,d): 0.30%~0.70%, Caking index (G): 85~90, Mineral catalytic index (MCI): 2.0%~2.5%, Dry ash-free volatile matter (Vdaf) ≥40%; Coking coal 1 # Sulfur content (St,d): 0.55%~0.75%, Binding index (G): 85~90, Mineral catalytic index (MCI): 5.0%~6.0%; Coking coal 2 # Sulfur content (St,d): 1.20%~1.50%, binding index (G): 80~85, mineral catalytic index (MCI): 1.0%~1.5%; Coking coal 3 # Sulfur content (St,d): 1.40%~1.80%, binding index (G): 85~90, mineral catalytic index (MCI): 2.5%~3.5%; Gas coal: Caking index G≥75; Lean coal: caking index G≥40; 。 2. The coke obtained from the blended coal according to claim 1, characterized in that, The post-reaction strength (CSR) of the coke is ≥68%.

3. The coke according to claim 2, characterized in that, The coke has a crush resistance M40 ≥ 88%, an abrasion resistance M10 ≥ 88%, and a coke reactivity CRI ≥ 88%.

4. A method for preparing the coke according to any one of claims 2-3, characterized in that, After blending, the mixed coal is crushed and fed into a 7m top-loading coke oven for coking. The standard temperatures on the machine side and coke side are 1250±10℃ and 1300±10℃, respectively, and the coking time is 26±2 hours.

5. The method according to claim 4, characterized in that, After crushing, mixed coal with a particle size of less than 3mm accounts for 68% to 72% of its total mass.

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