Background technology
Just as the fugitive constituent ratio in a kind of leaning agent adjusting coke making and coal blending, general volume is no more than 10% to hard coal in coke making and coal blending in the conventional art.In recent years because the coking coal resource is becoming tight, and price is surging, people begin one's study and join at high proportion hard coal in the coking coal as the feasibility of coking coal.Chinese patent 95104930 disclosed " a kind of " by hard coal and the formulated coking coal of bituminous coal, employing is the proportional quantity of 20-70%: 30-80% (weight) based on hard coal and hard coal and bituminous coal ratio, its bituminous coal that adopts is rich coal, if this coking coal wherein hard coal ratio surpasses 40%, be the coke produced of raw material with it since in the coal blending volatile content low, bad adhesion, therefore its intensity is all lower usually, the coke lumpiness is little, broken easily, can not use as common metallurgical coke, this coking coal more is difficult to produce the higher foundry coke of specification of quality.Similarly also have Chinese patent 97101391 disclosed " hard coal furnace and coking process thereof " with above-mentioned patent, hard coal and rich coal proportioning are 2-5: 5-8 in the wherein disclosed coking coal.The defective of its existence is similar to aforementioned patent.This patent also discloses a kind of coking process, and it is to adopt internal combustion formula down-flame improvement stove, tamps after coking coal is gone into stove.This coking mode is because the wasting of resources is big, and environmental pollution is serious, is now banned by country.
Summary of the invention
The present invention is directed to above-mentioned the deficiencies in the prior art, having proposed a kind of is the production method of coking coal and coke He this coke that this coking coal is raw material production of main raw material with the hard coal.It is poor for applicability to the invention solves the coking coal that hard coal and rich coal constitute in the prior art, and the coke strenth of production is low, and lumpiness is little, and of poor quality and production technique such as falls behind at deficiency.
Of the present invention is the coking coal of main raw material with the hard coal, contain hard coal and rich coal, wherein also be furnished with a certain proportion of 1/3 coking coal, the proportioning of above-mentioned three kinds of compositions is: hard coal: rich coal: 1/3 coking coal=40-60% (weight): 20-35% (weight): 20-35% (weight).
The physical and chemical index of the coking coal of said ratio is fugitive constituent=18-23%; Caking index=36-48; Gelatinous layer (Y value)=10-12.
Coking coal of the present invention is main coal with hard coal, add again and join rich coal and 1/3 coking coal can be refined various metallurgical cokes and foundry coke, expand the useful raw materials source of coking industry greatly, reduced the coke production cost significantly, can save a large amount of coking coal resources.And enlarge anthracitic range of application.
Of the present invention is the coke of the coking coal production of main raw material with the hard coal, the proportioning raw materials of wherein said coke is a hard coal: rich coal: 1/3 coking coal=40-60% (weight): 20-35% (weight): 20-35% (weight), and the physical and chemical index of this feed coal is: fugitive constituent=18-23%; Caking index=36-48; Gelatinous layer (Y value)=10-12.
Adopt the coke of coking coal production of the present invention to have following advantage: the first, the thermal response index is good, and wherein the CRI of the reactive low index of elevated temperature heat is 20.8-22.8%, and post-reaction strength high target CSR is 67.4-72.3%.These two indexs all are better than the requirement of outlet coke index.Because the post-reaction strength index of this coke is higher, its stock column skeleton that melts section in stove is fairly obvious, is difficult for broken; And good permeability, help improving furnace temperature, can significantly reduce coke ratio.And can reach 500M
3The use standard of above large blast furnace and cupola furnace.The second, the thermal value height, because anthracitic thermal value all is higher than bituminous coal usually, based on hard coal, the coke thermal value of its production obviously improves than the thermal value of ordinary coke in the coking coal of the present invention.The 3rd, coke cold strength height, wherein barrate strength M
40Be 88.8%, SI
50Index is 92-95%, and this coke is in transportation, and the broken burnt rate in the cargo handling process is lower than 4%, and the broken burnt rate of the same process of ordinary coke is up to 10-15%.The 4th, because the bituminous coal of China, the general sulfur-bearing height of coking coal particularly, thereby reduction coke sulphur content is a difficult problem all the time, and the coke that uses coking coal of the present invention to produce, owing to adopt the coal blending of vast scale low-sulfur hard coal, reduce bituminous coal coal blending ratio significantly, thereby can reduce the sulphur content of coke greatly.The test sulphur content is 0.38%.The sulfur-bearing index request that is better than foundry coke.Table 1 has been listed the coke result of laboratory test that adopts coking coal of the present invention to produce.
Table 1
Numbering |
Technical analysis % |
Full sulphur % |
Phosphorus % |
Physical strength |
Reactive |
Post-reaction strength |
????Mad |
??Ad |
??Vdaf |
??St,d |
??Pad |
????M40 |
??M25 |
??M10 |
??CRI,% |
??CSR,% |
1 |
????0.18 |
??11.65 |
??1.23 |
??0.38 |
??0.024 |
????88.6 |
??98.6 |
??7.3 |
??22.6 |
??66.1 |
It is the method for the coke of main raw material with the hard coal that the present invention produces above-mentioned, mainly comprises the steps:
A: coal separation, get hard coal 40-60% (weight); Rich coal 20-35% (weight); 1/3 coking coal 20-35% (weight);
B: pulverized anthracite is broken to particle diameter less than 5mm;
C: the hard coal after will pulverizing with joining rich coal and 1/3 coking coal mix, carry out the second time and pulverize, the raw coal size that makes gained 92-95% is less than 3mm;
D: make moulding firm by ramming;
E: go into the stove destructive distillation.
The production method of coke of the present invention adopts on the basis of hard coal and bituminous coal at high proportion and is equipped with 1/3 coking coal, the intensity and the lumpiness that help making moulding firm by ramming and improve coking property and coke; Adopt the technology of making firm by ramming of stokehold, be added to the compactness of stove coal, can improve the intensity and the lumpiness of coke.Hard coal is carried out the secondary pulverizing after the pulverizing separately again with after other two kinds of coal blendings mix, strengthened the homogeneity of each coal blending composition.
Embodiment
Of the present invention is the production method of coking coal and coke He this coke that this coking coal is raw material production of main raw material with the hard coal, chooses hard coal 40-60% (weight), rich coal 20-35% (weight), 1/3 coking coal 20-35% (weight).1/3 coking coal of the present invention can partly or entirely be replaced by other coking coal, and is consequently identical, and described rich coal can be replaced by part bottle coal or gas-fat coal.The physical and chemical index of the coking coal after above-mentioned three kinds of raw coal cooperate should reach fugitive constituent=18-23%; Caking index=36-48; Gelatinous layer (Y value)=10-12.Hard coal is crushed to the material footpath separately for below the 5mm; Carry out the secondary pulverizing again with after the rich coal of being joined, 1/3 coking coal mix, after pulverizing, secondary make the feed coal particle diameter of 92-95% less than 3mm, feed coal water ratio after the pulverizing is controlled at 9-11%, and promptly becoming of the present invention is the coking coal of main raw material with the hard coal.
Make above-mentioned coking coal firm by ramming moulding, the density of shaping raw material coal is 1.02-1.08;
Above-mentioned feed coal of making moulding firm by ramming is gone into stove destructive distillation coking, and promptly constituting of the present invention is the coke of the coking coal production of main raw material with the hard coal.
Embodiment 1 gets 40 tons in Jincheng hard coal; 35 tons of Pu County rich coal; 25 tons in 1/3 coking coal.At first pulverized anthracite is broken to granularity less than 5mm, then three kinds of raw coal is mixed, the coal particle diameter that further is crushed to 92-95% in whole mixed coals is less than 3mm.So far obtain coking coal of the present invention (batching coal), its caking index is 40, fugitive constituent 22%, Y value=16.6.The coal of should preparing burden is made moulding firm by ramming by the hydraulic pressure tamping unit makes its degree of compactness reach 1.02-1.08, right fed to boiler destructive distillation coking.Promptly get coke of the present invention.
Embodiment 2-6 is provided by table 2.Wherein added a small amount of gas-fat coal among the embodiment 3.Embodiment 4-6 has part or all of 1/3 Jiao for to be replaced by coking coal, and other is identical with embodiment 1.
Table 2
Embodiment |
Coal blending kind and quantity (ton) |
The coal blending index |
Make degree of compactness firm by ramming |
Hard coal |
Rich coal |
Gas-fat coal |
1/3 coking coal |
Coking coal |
Fugitive constituent % |
Caking index |
The Y value |
????2 |
????45 |
????25 |
|
???30 |
|
????20 |
??46 |
????11 |
????1.05 |
????3 |
????50 |
????20 |
????10 |
???20 |
|
????20 |
??45 |
????10 |
????1.02 |
????4 |
????60 |
????20 |
|
|
????20 |
????18.5 |
??36 |
????10 |
????1.03 |
????5 |
????40 |
????25 |
|
???25 |
????10 |
????20.5 |
??48 |
????12 |
????1.07 |
????6 |
????55 |
????20 |
|
???15 |
????10 |
????18 |
??40 |
????11 |
????1.08 |