CN104073318B - Sulphur method falls in a kind of high sulphur coal - Google Patents
Sulphur method falls in a kind of high sulphur coal Download PDFInfo
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- CN104073318B CN104073318B CN201410326731.5A CN201410326731A CN104073318B CN 104073318 B CN104073318 B CN 104073318B CN 201410326731 A CN201410326731 A CN 201410326731A CN 104073318 B CN104073318 B CN 104073318B
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Abstract
The present invention relates to a kind of high sulphur coal and fall sulphur method, by adding medicament and prevent that residual sulphuring treatment reaches the object of the sulphur content reduced in coal in high sulphur coal washing process, comprise particle, spraying screening, grind ore pulp, the step such as foaming, flocculation, collecting, sulfide are separated, quantitatively centrifuge dehydration, anti-residual sulphuring treatment, finally obtain low sulphur coal finished product, reduce 80% ~ 94% compared with the sulphur content in high sulphur coal raw material.Fall the comparatively traditional technology raising 5% ~ 10% of sulphur amplitude, control pollution from source.
Description
Technical field
The present invention relates to a kind of high sulphur coal and fall sulphur method, belong to coal process field.
Background technology
China is coal producer maximum in the world and coal consumption state, and for a long time, coal has indispensable low level as China's energy pillar, accounts for 3/4 of China's primary energy source.In coal, the content of sulphur is very large, all has from minimum sulphur content 0.2% to the highest more than 8%.And in existing explored coal reserves, a sizable part is the high sulphur coal of sulphur content > 3%, accounts for 1/3 of coal total reserves.
Along with the continuous increase of mining depth, the sulphur content of the main coal field of China has the trend of increase, and the environmental problem that high sulphur coal brings also becomes increasingly conspicuous.Thermoelectricity, iron and steel enterprise use coal to give off the flue gases such as a large amount of oxysulfides, oxynitride and enter air, cause serious atmospheric pollution and haze weather, and some areas formation acid rain, brings serious harm to ecotope and national economy.Therefore, it is very urgent to administer the pollution caused by coal burning, how to reduce the sulphur content of coal especially in high sulphur coal and has become problem demanding prompt solution.
Summary of the invention
In order to solve during high-sulfur matchmaker uses the problem of environmental pollution brought, the invention provides a kind of high sulphur coal desulfurization before combustion, fall sulphur method, by adding medicament and prevent that residual sulphuring treatment reaches the object of the sulphur content reduced in coal in high sulphur coal washing process, it comprises the following steps:
(1) particle: high sulphur coal pulverizer is crushed to standard-sized particle;
(2) spraying screening: the particle after previous step shatters is through spraying screening, and will not meet standard-sized particle and return particle step and again pulverize, the particle of conformance with standard size enters the step grinding ore pulp;
(3) ore pulp is ground: previous step is screened the particle obtained and evenly sends into ball mill via lift, feeder, by ball mill, it is ground, obtain ore pulp;
(4) bubble: the ratio of ore pulp and hydromining 1:0.6 is mixed, according to ore pulp 5 ~ 10Kg Standard entertion pore forming material per ton, at the uniform velocity stirs 5 ~ 10 minutes, when alcohol fully mixes with ore pulp;
(5) flocculate: according to the standard of ore pulp consumption per ton 3 ~ 8Kg, add hydrocarbon ils flocculation agent in the ore pulp stirred, leaving standstill and form obvious liquid level layering to ore pulp, there is the floss suspended in mineral syrup liquid;
(6) collecting: add sulfide collecting agent in ore pulp, fully stir, until form tan precipitate and white opacity liquid;
(7) sulfide is separated: be suspended in the upper coal of ore pulp with strainer filtering, obtain low sulphur coal wet product;
(8) quantitatively centrifuge dehydration: by low sulphur coal wet product through quantitative centrifugal dehydration treatment, to reduce the water content in coal;
(9) anti-residual sulphuring treatment: add unslaked lime coal blending according to the ratio of 1:0.1 in the low sulphur coal prepared, obtain low sulphur coal finished product.
Step (1) adopts jaw crusher to pulverize, and the standard size described in step (1) refers to 18 ~ 25mm;
Step (2) is implemented omnidistance water atomization and is sprayed, and the dust that coal is produced in screening process can be effectively controlled, and prevents dust polluting environment;
Step (3) adopts conical bell mill, controls it and grinds the particle size that obtains between 0.1-0.5mm, preferred 0.3mm;
The pore forming material of step (4) adopts 50%-80% ethanol, preferably 75% ethanol;
The hydrocarbon ils flocculation agent of step (5) is by No. 1 flotation oil, heavy gas oil, kerosene, and two or more in petroleum naphtha is formulated;
Step (6) is added respectively containing FeSO in ore pulp
4, Na
2the sulfide collecting agent of S, adds according to the standard of ore pulp 4 ~ 8Kg collecting agent per ton respectively.
The form that sulphur in coal exists according to it is different with kind, is divided into Sulfur Coal and inorganic sulfur coal.Organosulfur mainly comprises mercaptan, disulphide etc., organically combines with coal molecule, cannot be removed by physical method; Inorganic sulfur is mainly based on iron sulphide, and in addition also with a small amount of vitriol, in coal, be attached to coal surface with forms such as stratiform, block tuberculosis, subparticles, major part can be removed by physical route.
The present invention adopts jaw crusher that raw coal is broken, and object is in order to follow-up screening, grinds ore pulp and provide basic condition.Meanwhile, by the mode of physics fragmentation, the part inorganic sulfur in raw coal is decomposed and peels off, be convenient to follow-up desulfurization processing.After fragmentation, granulometry should≤25mm.
The main purpose of spraying screening is the coal particles after screening jaw crushing crusher machine, makes it meet the standard of ball mill grinding.Implement omnidistance water atomization in screening process to spray, the dust that coal is produced in screening process can be effectively controlled, and prevents dust polluting environment.
The present invention adopts
Φ 1200*3000conical bell mill, this ball mill, compared with the ball mill of routine, has the features such as strong, the broken speed of crumbliness is fast, energy consumption is low, particle size after cracking is little.Utilize this equipment to grind coal ore pulp, coal can be milled to the particle between 0.075mm ~ 0.89mm, the granularity of application claims is preferably 0.3mm.Because sulfurous iron ore is not the organic composition material of coal, so sulfurous iron ore and coal can be impelled after being processed by defibrination to dissociate.Ore pulp after grinding is via the transmission of pump pulp grinder, and to selecting materials, pond processes.
The object adding pore forming material makes to be attached to the sulphur on coal surface, sulfide and other accompanying impurities effective eliminations.Add the hydrophobicity that flocculation agent can strengthen mineral surface, improve the cracking of coal sulphur separating agent, collecting ability, make the coal in ore pulp form floc sedimentation, be convenient to S element and the mineral substance separation containing S.
By adding pore forming material and flocculation agent, ore pulp has formed obvious liquid level layering, and the floss suspended appears in mineral syrup liquid, and this suspended substance is the coal in the ore pulp of hydrocarbon ils flocculation agent collecting in front road technique.Next, add respectively with FeSO in ore pulp
4solution and Na
2s solution is the sulfide collecting agent of main formula, adds rear abundant stirring, occurs tan precipitate FeS and white opacity liquid Na
2sO
4.Add the sulfide collecting agent of this mixed preparing, sulphur effectively and in coal ore pulp and sulfide complexing can separate out, the sulphur content in coal is significantly reduced.
Through process above, ore pulp layering is obvious, and the sulfide contained in ore pulp is by pore forming material cracking, replacement(metathesis)reaction with additive, and be effectively suppressed, coal and sulfide have carried out effective isolation.Now, utilize strainer filtering to be suspended in the upper coal of ore pulp, low sulphur coal wet product can be obtained.
Remaining ore pulp is precipitated 10 ~ 30 minutes, separates out the FeS in ore pulp.Then, in residue ore pulp, saturated Ca (OH) is added
2solution, additive capacity is 5Kg/t, and stir 5 ~ 10 minutes, reacted ore pulp main component is Na
2cO
3with the mixed solution of water, can prepare for the Na needed for process for processing of the present invention by adding chemical agent wherein
2s, enables the effective recycle of resource.
The special quantitative centrifugal-dehydration device such as FAX-M012 is utilized to reduce the water content of low sulphur coal wet products, to meet national standard or heat supply, Thermal Power Enterprises to the requirement of coal water content.
Affect except sulfur additives is to coal sulfur limitation effect to prevent external condition, this technology adopts the anti-residual treatment of secondary, add unslaked lime coal blending according to the ratio of 1:0.1, the S element remained in coal is collected in slag with solidification, avoid discharge after stain air.
The characteristic that the method is hydrophobic according to high sulphur coal parent coal, utilizes the physicochemical characteristic of high sulphur coal and associated minerals product thereof, adopts physical method and metathesis chemical reaction method to design.Advantage is in whole production process, to add the chemical agent cost such as flotation, flocculation, foaming, collecting used low, avoid traditional technology and produce the problem of secondary pollution.
More traditional combustion pretreatment mode is compared, and the production cost of the method applied in the present invention is lower, production process is easier, raw coal sulphur content can be reduced by 80% ~ 94%, falls the comparatively traditional technology raising 5% ~ 10% of sulphur amplitude, controls pollution from source.
Embodiment
Below in conjunction with embodiment, the method for the invention is described.
Embodiment 1
Get 1 ton of high sulphur coal raw material (sulphur content is about 6%), pulverized by jaw crusher (Sino-German heavy industry PEX-250x750 series), grinding particle size diameter control is between 18 ~ 25mm.By the particle after shattering through spraying screening, will not meet standard-sized particle and return particle step and again pulverize, the particle of conformance with standard size (between particle diameter 18 ~ 25mm) enters the step grinding ore pulp.
Above-mentioned particle is evenly sent into via lift, feeder
Φ 1200*3000conical bell mill, is pulverized, is ground to the particle of about 3mm to it by ball mill.Add the water accounting for coal particles weight 60%, obtain ore pulp, pulp viscosity controls between 2.5Pa.s ~ 5.0Pa.s.
Ore pulp is transported to ore pulp retort through turbine transfer pump, in ore pulp, the ethanol of 75% of 14Kg is added with flow solenoid valve, at the uniform velocity stir 5 ~ 10 minutes, when alcohol fully mixes with ore pulp, add by No. 1 flotation oil and the petroleum naphtha hydrocarbon ils flocculation agent 10Kg according to 1:1 proportions, leaving standstill and form obvious liquid level layering to ore pulp, there is cotton-shaped suspended substance in mineral syrup liquid.
10KgFeSO is added respectively in ore pulp
4solution (25%) and 10KgNa
2s solution (15%), stirs 5 ~ 7 minutes through ore pulp mixing tank, occurs tan precipitate FeS and white opacity liquid Na
2sO
4.Be suspended in the upper coal of ore pulp with strainer filtering, low sulphur coal wet product can be obtained; Reaction process before remaining ore pulp can be used for after treatment, so that recycle.
Utilize the special quantitative centrifugal-dehydration device of FAX-M012 to dewater to low sulphur coal wet product, obtain 450Kg cleaned coal, after testing, its sulphur content is about 0.6%.
Embodiment 2
Get 1.5 tons of high sulphur coal raw materials (sulphur content is about 6.5%), pulverized by jaw crusher (Sino-German heavy industry PEX-250x750 series), grinding particle size diameter control is between 18 ~ 25mm.By the particle after shattering through spraying screening, will not meet standard-sized particle and return particle step and again pulverize, the particle of conformance with standard size (between particle diameter 18 ~ 25mm) enters the step grinding ore pulp.
Above-mentioned particle is evenly sent into via lift, feeder
Φ 1200*3000conical bell mill, is pulverized, is ground to the particle of about 3mm to it by ball mill.Add the water accounting for coal particles weight 60%, obtain ore pulp, pulp viscosity controls between 2.5Pa.s ~ 5.0Pa.s.
Ore pulp is transported to ore pulp retort through turbine transfer pump, in ore pulp, the ethanol of 75% of 21Kg is added with flow solenoid valve, at the uniform velocity stir 5 ~ 10 minutes, when alcohol fully mixes with ore pulp, add by No. 1 flotation oil and the kerosene hydrocarbon ils flocculation agent 15Kg according to 1:1 proportions, leaving standstill and form obvious liquid level layering to ore pulp, there is cotton-shaped suspended substance in mineral syrup liquid.
15KgFeSO is added respectively in ore pulp
4solution (20%) and 15KgNa
2s solution (20%), stirs 5 ~ 7 minutes through ore pulp mixing tank, occurs tan precipitate FeS and white opacity liquid Na
2sO
4.Be suspended in the upper coal of ore pulp with strainer filtering, low sulphur coal wet product can be obtained.
Utilize the special quantitative centrifugal-dehydration device of FAX-M012 to dewater to low sulphur coal wet product, obtain 650Kg cleaned coal, after testing, its sulphur content is about 0.7%.
In order to prevent external condition from affecting except sulfur additives is to coal sulfur limitation effect, adding unslaked lime coal blending according to the ratio of 1:0.1, the S element remained in coal is collected in slag with solidification, avoid discharge after stain air.
More traditional combustion pretreatment mode is compared, and the production cost of the method applied in the present invention is lower, production process is easier, raw coal sulphur content can be reduced by 80% ~ 94%, falls the comparatively traditional technology raising 5% ~ 10% of sulphur amplitude, controls pollution from source.
Claims (3)
1. a sulphur method falls in high sulphur coal, and it comprises the following steps:
(1) particle: high sulphur coal jaw crusher is crushed to standard-sized particle, described standard size is 18 ~ 25mm;
(2) spraying screening: the particle after previous step shatters is through spraying screening, and will not meet standard-sized particle and return particle step and again pulverize, the particle of conformance with standard size enters the step grinding ore pulp;
(3) grind ore pulp: previous step is screened the particle obtained and evenly sends into conical bell mill via lift, feeder, by ball mill, it is ground, control it and grind the particle size that obtains between 0.1-0.5mm, obtain ore pulp;
(4) bubble: the ratio of ore pulp and hydromining 1:0.6 mixed, according to ore pulp 5 ~ 10Kg Standard entertion pore forming material per ton, at the uniform velocity stir 5 ~ 10 minutes, when pore forming material fully mixes with ore pulp, described pore forming material adopts 50%-80% ethanol;
(5) flocculate: according to the standard of ore pulp consumption per ton 3 ~ 8Kg, hydrocarbon ils flocculation agent is added in the ore pulp stirred, leave standstill to ore pulp and form obvious liquid level layering, there is the floss suspended in mineral syrup liquid, described hydrocarbon ils flocculation agent is formulated by two or more in No. 1 flotation oil, heavy gas oil, kerosene, petroleum naphtha;
(6) collecting: add containing FeSO in ore pulp
4, Na
2the sulfide collecting agent of S, adds according to the standard of ore pulp 4 ~ 8Kg collecting agent per ton respectively, fully stirs, until form tan precipitate and white opacity liquid;
(7) sulfide is separated: be suspended in the upper coal of ore pulp with strainer filtering, obtain low sulphur coal wet product;
(8) quantitatively centrifuge dehydration: by low sulphur coal wet product through quantitative centrifugal dehydration treatment, to reduce the water content in coal;
(9) anti-residual sulphuring treatment: add unslaked lime coal blending according to the ratio of 1:0.1 in the low sulphur coal prepared, obtain low sulphur coal finished product, the low sulphur coal finished product obtained reduces 80% ~ 94% compared with the sulphur content in high sulphur coal raw material.
2. sulphur method falls in a kind of high sulphur coal according to claim 1, it is characterized in that: it is 0.3mm that step (3) grinds the particle size obtained.
3. sulphur method falls in a kind of high sulphur coal according to claim 1, it is characterized in that: the pore forming material of step (4) adopts 75% ethanol.
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1368404A (en) * | 2001-01-31 | 2002-09-11 | 胡军 | Floatating, desulfurizing and ash-reducing method for hihg-sulfur fine-particle coal |
| CN1821369A (en) * | 2006-03-15 | 2006-08-23 | 谢德胜 | Sulfur removing composition for civil coal |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1368404A (en) * | 2001-01-31 | 2002-09-11 | 胡军 | Floatating, desulfurizing and ash-reducing method for hihg-sulfur fine-particle coal |
| CN1821369A (en) * | 2006-03-15 | 2006-08-23 | 谢德胜 | Sulfur removing composition for civil coal |
Non-Patent Citations (2)
| Title |
|---|
| 用选择性絮凝技术精选细粒高硫煤;张明旭等;《煤炭科学技术》;19980831;第26卷(第8期);28-30 * |
| 高效的高硫煤物理洗选脱硫技术;徐建平;《中国煤炭》;20110331;第27卷(第3期);15-17 * |
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