CN101993754A - Method for removing impurities from coal in reaction chamber - Google Patents
Method for removing impurities from coal in reaction chamber Download PDFInfo
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- CN101993754A CN101993754A CN2010102605585A CN201010260558A CN101993754A CN 101993754 A CN101993754 A CN 101993754A CN 2010102605585 A CN2010102605585 A CN 2010102605585A CN 201010260558 A CN201010260558 A CN 201010260558A CN 101993754 A CN101993754 A CN 101993754A
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- coal
- solution
- acid solution
- nitrate
- reaction chamber
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
- C01B32/00—Carbon; Compounds thereof
- C01B32/05—Preparation or purification of carbon not covered by groups C01B32/15, C01B32/20, C01B32/25, C01B32/30
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- Solid Fuels And Fuel-Associated Substances (AREA)
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Abstract
A method for removing at least one impurity from coal is described herein. The method includes providing coal comprising a plurality of impurities and contacting the coal with an acid solution in a reaction chamber. At least one of the impurities reacts with the acid solution to produce one or more first products soluble in the acid solution. The method further includes removing at least a portion of the acid solution including at least a portion of the first products from the reaction chamber and adding a nitrate composition to the reaction chamber to form a nitrate solution. At least one of the impurities, at least one of the first products, or combinations thereof react with the nitrate composition to produce one or more second products soluble in the nitrate solution. The method still further includes removing at least a portion of the nitrate solution including at least a portion of the second products from the reaction chamber.
Description
Technical field
In general, the present invention relates to produce the method for ultra-clean coal, more specifically, relate to by removing impurity and produce ultra-clean coal from coal.
Background technology
Clean coal such as ultra-clean coal can remove impurity and provide by handling impure coal.For example, impure coal can produce first reaction slurry with hydrofluoric acid treatment in first reactor.First reaction slurry is transported to strainer (as drum filter) to produce filtered wet coal.Filtered wet coal can be transported to second reactor then and handle to produce second reaction slurry with nitrate.Second reaction slurry can be transported to strainer then to filter.The gained ultra-clean coal can be washed and be delivered to moisture eliminator then with drying.Therefore, a plurality of reactors of this multistep arts demand, shurry pump and strainer.The associated cost of these various processing units and space requirement may be very big.Therefore need avoid the improvement technology from coal removal impurity of one or more above-mentioned shortcomings and defective.
Summary of the invention
The disclosure provides a kind of method of removing at least a impurity from coal.Described method comprises to be provided the coal that comprises plurality of impurities and described coal is contacted in reaction chamber with acid solution.In the described impurity at least one and described acid solution reaction produce one or more and dissolve in first product in the described acid solution.Described method comprises that also being removed to small part from reaction chamber contains to the acid solution of described first product of small part with to reaction chamber and add the nitrate composition to form nitrate solution.At least one or its combination in the described impurity at least one, described first product produces one or more with the nitrate composition react and dissolves in second product in the described nitrate solution.Described method comprises that also being removed to small part from reaction chamber contains to the nitrate solution of described second product of small part.
By following detailed, accompanying drawing and claim, other aspects of the present invention, feature and advantage will be apparent.
Description of drawings
Fig. 1 is a schema, has illustrated to produce by one embodiment of the invention the method 10 of ultra-clean coal.
Embodiment
Sum up as top, the disclosure contains the method for removing at least a impurity from coal.Therefore, the embodiment of method of the present disclosure will provide ultra-clean coal.The term of using herein " ultra-clean coal " refers to have the ash oontent (for example being lower than about 2%) of reduction and/or significantly reduced sulphur content so that described coal and can be fed directly in each technology such as the internal combustion turbine technology and advantage such as improved thermo-efficiency are provided.Non-combustibleconstituents before " ash content " used herein refers to burn in the coal and the non-combustible byproducts that produces because of burning of coal the two.Provide the embodiment of the method for ultra-clean coal will be described below and in the schema of Fig. 1, illustrate.Should be understood that any system (as gas turbine engine systems such as coal gas expander system, fine coal power station and integrated gasification combined cycle system) all can use the coal that embodiment provided (as ultra-clean coal) of method of the present disclosure.
Fig. 1 is a schema, has illustrated the embodiment of removing the method 10 of at least a impurity from coal of the present disclosure.Method 10 is included in step 12 place the coal that comprises plurality of impurities is provided.The embodiment of method 10 can provide the coal of the form of hard coal, bituminous coal, sub-bituminous coal, brown coal or its combination.In certain embodiments, the coal of handling by method 10 in batch is enough to the charging in 24-hour as steam turbine.In specific embodiments, be a collection of coal that provides in batch with about 300 tons to about 10,000 tons in the reaction chamber.In other particular, be a collection of coal that provides in batch with about 400 tons to about 600 tons in the reaction chamber.In other particular, be a collection of coal that provides in batch with about 400 tons to about 500 tons in the reaction chamber.But should be understood that and depend on purposes (as the steam turbine of different steam turbine, different quantities, different purposes as coal being converted into diesel oil etc.), the amount of the coal that provides in batch can improve or reduce in proportion.
In some embodiments, impurity includes but not limited to oxide compound, mineral, inorganic and organosulfur compound, alkali, ash content or its combination of aluminium, iron, potassium, calcium, sodium and other metals.
In certain embodiments, impurity can about 2% weight be present in the coal to the amount of about 50% weight.In other embodiments, impurity can about 3% weight be present in the coal to the amount of about 8% weight.In another other embodiments, impurity can about 5% weight be present in the coal to the amount of about 7% weight.
Table 1: the chemical composition range example (representing) of the flying dust that produces from dissimilar coal with weight percentage
Source: http://www.tfhrc.gov
Method 10 also is included in second step 14 place makes coal contact in reaction chamber with acid solution.In the described impurity at least one and acid solution reaction produce one or more and dissolve in first product in the described acid solution.In some embodiments, acid solution can include but not limited to other strong acid solutions of hydrofluoric acid solution, salpeter solution, hydrochloric acid soln, silicate fluoride solution, its combination or dissolved oxygen thing.
Nitrate solution 28 provides among the formula I below with the example of the addition reaction of at least a impurity:
SiO
2+4HF→SiF
4+2H
2O (I)
In certain embodiments, the acid concentration of acid solution is in about 3M arrives about 10M scope.In other embodiments, the acid concentration of acid solution is in about 3M arrives about 6M scope.In another other embodiments, the acid concentration of acid solution is in about 4M arrives about 6M scope.
In specific embodiments, in the step 14 weight ratio of acid solution and coal in about 10: 1 to about 10: 5 scopes.In other particular, the weight ratio of acid solution and coal is in about 10: 2 to about 10: 4 scopes in the step 14.In other particular, the weight ratio of acid solution and coal is in about 10: 2.5 to about 10: 3.5 scopes in the step 14.
In certain embodiments, acid solution comprises the hydrofluoric acid solution of hydrofluoric acid concentration in about 3M arrives about 10M scope.In other embodiments, acid solution comprises the hydrofluoric acid solution of hydrofluoric acid concentration in about 3M arrives about 6M scope.In another other embodiments, acid solution comprises the hydrofluoric acid solution of hydrofluoric acid concentration in about 4M arrives about 6M scope.In specific embodiments, in the step 14 weight ratio of hydrofluoric acid solution and coal in about 10: 1 to about 10: 5 scopes.In other particular, the weight ratio of hydrofluoric acid solution and coal is in about 10: 2 to about 10: 4 scopes in the step 14.In other particular, the weight ratio of hydrofluoric acid solution and coal is in about 10: 2.5 to about 10: 3.5 scopes in the step 14.
In specific embodiments, second step 14 comprises and makes coal contact about 1 hour to about 10 hours with acid solution.In other particular, second step 14 comprises makes coal contact about 3 hours to about 5 hours with acid solution.In other particular, second step 14 comprises makes coal contact about 4 hours to about 5 hours with acid solution.
In specific embodiments, second step 14 comprises coal is contacted under the temperature of about 200 ℉ at about 70 ℉ with acid solution.In other particular, second step 14 comprises makes coal contact under the temperature of about 170 ℉ at about 110 ℉ with acid solution.In other particular, second step 14 comprises makes coal contact under the temperature of about 160 ℉ at about 140 ℉ with acid solution.
In specific embodiments, second step 14 comprises coal is contacted under the pressure of about 1000psia at about 14psia with acid solution.In other particular, second step 14 comprises makes coal contact under the pressure of about 42psia at about 14psia with acid solution.In other particular, second step 14 comprises makes coal contact under the pressure of about 20psia at about 14psia with acid solution.
In certain embodiments, described one or more first products comprise one or more fluorochemicals, oxyhydroxide, hydroxyfluoride, oxide compound or its combination.Described therein first product comprises in the embodiment of one or more fluorochemicals, and described fluorochemical can be selected from silicon fluoride, aluminum fluoride, ferric fluoride, Calcium Fluoride (Fluorspan), Sodium Fluoride or its combination.
The third step 16 of method 10 comprises that being removed to small part from reaction chamber contains to the acid solution of described first product of small part.In specific embodiments, can removing substantially from reaction chamber in third step 16, all contain the acid solution of basic all described first products.
In certain embodiments, third step 16 can be undertaken by opening the strainer that next-door neighbour's reaction chamber basal surface arranges, contains to can flow through strainer and flow out reaction chamber of the acid solution of described first product of small part thereby make to small part.
The 4th step 18 of method 10 comprises in reaction chamber and to add the nitrate composition forming nitrate solution, dissolves in second product in the described nitrate solution so that at least one or its combination at least one in the described impurity, described first product and nitrate composition react produce one or more.In certain embodiments, the nitrate composition comprises nitrate aqueous solution, nitric acid, aluminum nitrate, iron nitrate, fluorine nitrate, other nitrate, oxyhydroxide, hydroxyfluoride, subnitrate, its ion or its combination.
In some embodiments of described method, described one or more second products comprise nitrate ion, sulfate ion, iron ion, hydroxyfluoride, oxide compound, fluorine nitrate or its combination.
Nitrate solution 28 provides in Formula Il and III with the example of the addition reaction of at least a impurity:
FeS
2+14Fe(NO
3)
3+8H
2O→(II)
2SO
4 2-+16H
++15Fe
2++42NO
3-
In specific embodiments, the concentration of nitrate composition is in about 0.1M arrives about 5M scope.In other particular, the concentration of nitrate composition is in about 0.1M arrives about 0.4M scope.In other particular, the concentration of nitrate composition is in about 0.1M arrives about 0.3M scope.
In certain embodiments, in the step 18 weight ratio of nitrate composition and coal in about 10: 1 to about 10: 5 scopes.In other embodiments, in the step 18 weight ratio of nitrate composition and coal in about 10: 2 to about 10: 4 scopes.In another other embodiments, the weight ratio of nitrate composition and coal is in about 10: 2.5 to about 10: 3.5 scopes in the step 18.
In specific embodiments, the nitrate composition comprises the salpeter solution of concentration of nitric acid in about 0.1M arrives about 5M scope.In other particular, the nitrate composition comprises the salpeter solution of concentration of nitric acid in about 0.1M arrives about 0.4M scope.In other particular, the nitrate composition comprises the salpeter solution of concentration of nitric acid in about 0.2M arrives about 0.3M scope.In certain embodiments, in the step 18 weight ratio of salpeter solution and coal in about 10: 1 to about 10: 5 scopes.In other embodiments, in the step 18 weight ratio of salpeter solution and coal in about 10: 2 to about 10: 4 scopes.In another other embodiments, the weight ratio of salpeter solution and coal is in about 10: 2.5 to about 10: 3.5 scopes in the step 18.
According to some embodiment of the present disclosure, method 10 also comprises kept nitrate solution about 20 hours to about 30 hours in reaction chamber.In other particular, method 10 also comprises kept nitrate solution about 22 hours to about 26 hours in reaction chamber.
In specific embodiments, method 10 comprises that also making nitrate solution be maintained at about 70 ℉ in reaction chamber arrives under the temperature of about 190 ℉.In other particular, method 10 also comprises makes nitrate solution be maintained at about 150 ℉ in reaction chamber under the temperature of about 190 ℉.In other particular, method 10 also comprises makes nitrate solution be maintained at about 140 ℉ in reaction chamber under the temperature of about 160 ℉.
In specific embodiments, method 10 comprises that also making nitrate solution be maintained at about 14.4psia in reaction chamber arrives under the pressure of about 100psia.In other particular, method 10 also comprises makes nitrate solution be maintained at about 14.4psia in reaction chamber under the pressure of about 43psia.In other particular, method 10 also comprises makes nitrate solution be maintained at about 14.4psia in reaction chamber under the pressure of about 28psia.
The 5th step 20 of method 10 comprises that being removed to small part from reaction chamber contains to the nitrate solution of described second product of small part.In specific embodiments, can removing substantially from reaction chamber in the 5th step 20, all contain the nitrate solution of basic all described second products.
In certain embodiments, the 5th step 20 can be undertaken by opening the strainer that next-door neighbour's reaction chamber basal surface arranges, contains to can flow through strainer and flow out reaction chamber of the nitrate solution of described second product of small part thereby make to small part.
After the 5th step 20, the ash content amount that can be lower than about 0.1% weight is present in the coal in specific embodiments.In some embodiment of method 10, after the 5th step 20, ash content is present in the coal with the amount of about 0.1% weight to about 1% weight.In other embodiments of method 10, after the 5th step 20, ash content is present in the coal with the amount of about 0.1% weight to about 0.3% weight.
In specific embodiments, described method also comprises acid solution in the stirring reaction chamber, the nitrate solution in the stirring reaction chamber or the two.In some embodiments, method 10 also is included in the 5th step 20 after washing coal.
Come to remove at least a impurity by in " intermittently " technology, in a reaction chamber, handling coal, can eliminate a plurality of reactors, a plurality of strainer and transport unit (as pump and travelling belt) and also can reduce cost and space requirement from coal.In addition, having reduced coal is exposed to outside the reactor.Especially, can use a reaction chamber to realize the reaction of first leaching vat and coal and second leaching vat and coal.Therefore will reduce the coal loss and avoid following the harm of chemical delivery.
Should be clearly, the aforementioned preferred embodiment that only relates to the application, those skilled in the art can do change in a large number and modification and not depart from overall spirit of the present invention and scope it, and overall spirit of the present invention and scope are limited by subsidiary claims and Equivalent thereof.
Claims (10)
1. remove the method (10) of at least a impurity from coal for one kind, described method (10) comprising:
The coal that comprises plurality of impurities is provided;
Described coal is contacted in reaction chamber with acid solution, and at least one in the wherein said impurity and described acid solution reaction produce one or more and dissolve in first product in the described acid solution;
Being removed to small part from described reaction chamber contains to the acid solution of described one or more first products of small part;
Add the nitrate composition forming nitrate solution in described reaction chamber, at least one or its combination at least one in the wherein said impurity, described first product and described nitrate composition react produce one or more and dissolve in second product in the described nitrate solution; With
Being removed to small part from described reaction chamber contains to the nitrate solution of described one or more second products of small part.
2. the method for claim 1 (10), wherein said acid solution comprises hydrofluoric acid solution, salpeter solution, hydrochloric acid soln, silicate fluoride solution or its combination.
3. the method for claim 1 (10), wherein said acid solution comprise hydrofluoric acid concentration arrives about 10M for about 3M hydrofluoric acid solution.
4. the method for claim 1 (10), wherein said acid solution comprises hydrofluoric acid solution, and the weight ratio of hydrofluoric acid solution and coal is about 10: 1 to about 10: 5 in the described contact procedure.
5. the method for claim 1 (10), wherein said contact procedure comprises makes described coal contact about 1 hour to about 10 hours with described acid solution.
6. the method for claim 1 (10), wherein said contact procedure comprises makes described coal contact under the temperature of about 200 ℉ at about 70 ℉ with described acid solution.
7. the method for claim 1 (10), wherein said nitrate composition comprise concentration of nitric acid arrives about 5M for about 0.1M salpeter solution.
8. the method for claim 1 (10), wherein said nitrate composition comprises salpeter solution, and the weight ratio of salpeter solution and coal is about 10: 1 to about 10: 5 in the described adding step.
9. the method for claim 1 (10), described method also comprise before the step of removing described nitrate solution kept described nitrate solution about 20 hours to about 30 hours in described reaction chamber.
10. the method for claim 1 (10), described method also comprise before the step of removing described nitrate solution makes described nitrate solution be maintained at about 70 ℉ in described reaction chamber under the temperature of about 190 ℉.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US12/538341 | 2009-08-10 | ||
| US12/538,341 US20110030271A1 (en) | 2009-08-10 | 2009-08-10 | Method for removing impurities from coal in a reaction chamber |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN101993754A true CN101993754A (en) | 2011-03-30 |
Family
ID=43448474
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2010102605585A Pending CN101993754A (en) | 2009-08-10 | 2010-08-10 | Method for removing impurities from coal in reaction chamber |
Country Status (5)
| Country | Link |
|---|---|
| US (1) | US20110030271A1 (en) |
| JP (1) | JP2011038098A (en) |
| CN (1) | CN101993754A (en) |
| CH (1) | CH701635B1 (en) |
| DE (1) | DE102010036871A1 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110272772A (en) * | 2019-08-05 | 2019-09-24 | 中南大学 | A kind of ultrapure anthracitic preparation method |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4083940A (en) * | 1976-02-23 | 1978-04-11 | Aluminum Company Of America | Coal purification and electrode formation |
| US4169710A (en) * | 1978-03-29 | 1979-10-02 | Chevron Research Company | Process for comminuting and reducing the sulfur and ash content of coal |
| CN86101114A (en) * | 1985-02-19 | 1986-08-13 | 韦梅特有限公司 | Chemical treatment for the continuous reduction and removal of minerals contained in the carbon structure |
| US4695290A (en) * | 1983-07-26 | 1987-09-22 | Integrated Carbons Corporation | Integrated coal cleaning process with mixed acid regeneration |
| EP1950275A2 (en) * | 2007-01-18 | 2008-07-30 | Exxaro Coal (Proprietary) Limited | Coal desulphurization process |
Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5196801A (en) * | 1975-02-20 | 1976-08-25 | Tanzaino shitsushikishoriho | |
| US4441993A (en) * | 1975-11-03 | 1984-04-10 | Fluor Corporation | Flotation process |
| EP0134530A3 (en) * | 1983-07-29 | 1985-09-11 | Japan Australia Process Coal Company | A process for removing mineral inpurities from coals and oil shales |
| JPS60203698A (en) * | 1984-03-28 | 1985-10-15 | Nichigou Process Koole Kk | Removal of pyrite from coal |
| JPS61285290A (en) * | 1985-06-12 | 1986-12-16 | Hitachi Zosen Corp | Chemical deashing of coal |
| US4741741A (en) * | 1986-10-17 | 1988-05-03 | The Standard Oil Company | Chemical beneficiation of coal |
| AUPM877394A0 (en) * | 1994-10-13 | 1994-11-03 | University Of Melbourne, The | Process for treating a material containing inorganic matter (II) |
-
2009
- 2009-08-10 US US12/538,341 patent/US20110030271A1/en not_active Abandoned
-
2010
- 2010-08-03 JP JP2010174061A patent/JP2011038098A/en active Pending
- 2010-08-05 DE DE102010036871A patent/DE102010036871A1/en not_active Withdrawn
- 2010-08-09 CH CH01278/10A patent/CH701635B1/en not_active IP Right Cessation
- 2010-08-10 CN CN2010102605585A patent/CN101993754A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4083940A (en) * | 1976-02-23 | 1978-04-11 | Aluminum Company Of America | Coal purification and electrode formation |
| US4169710A (en) * | 1978-03-29 | 1979-10-02 | Chevron Research Company | Process for comminuting and reducing the sulfur and ash content of coal |
| US4695290A (en) * | 1983-07-26 | 1987-09-22 | Integrated Carbons Corporation | Integrated coal cleaning process with mixed acid regeneration |
| CN86101114A (en) * | 1985-02-19 | 1986-08-13 | 韦梅特有限公司 | Chemical treatment for the continuous reduction and removal of minerals contained in the carbon structure |
| EP1950275A2 (en) * | 2007-01-18 | 2008-07-30 | Exxaro Coal (Proprietary) Limited | Coal desulphurization process |
Non-Patent Citations (1)
| Title |
|---|
| K. SASAKI ET AL.: "The role of sulfur-oxidizing bacteria Thiobacillus thiooxidans in pyrite weathering", 《COLLOIDS AND SURFACES》, vol. 133, 31 December 1998 (1998-12-31), pages 270 - 1 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110272772A (en) * | 2019-08-05 | 2019-09-24 | 中南大学 | A kind of ultrapure anthracitic preparation method |
| CN110272772B (en) * | 2019-08-05 | 2021-02-19 | 中南大学 | A kind of preparation method of ultrapure anthracite |
Also Published As
| Publication number | Publication date |
|---|---|
| CH701635B1 (en) | 2015-02-27 |
| DE102010036871A1 (en) | 2011-02-17 |
| CH701635A2 (en) | 2011-02-15 |
| US20110030271A1 (en) | 2011-02-10 |
| JP2011038098A (en) | 2011-02-24 |
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