CN104973880A - Carbonaceous pellet and preparation method thereof - Google Patents
Carbonaceous pellet and preparation method thereof Download PDFInfo
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- CN104973880A CN104973880A CN201510358302.0A CN201510358302A CN104973880A CN 104973880 A CN104973880 A CN 104973880A CN 201510358302 A CN201510358302 A CN 201510358302A CN 104973880 A CN104973880 A CN 104973880A
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Abstract
The invention discloses a carbonaceous pellet and its preparation method. The preparation method of the carbonaceous pellet comprises the following steps: mixing powdered carbon, carbonate and a binder so as to obtain a first mixture; mulling and stirring the first mixture; carrying out compression moulding treatment on the first mixture which has undergone mulling and stirring so as to obtain a moist pellet; and airing the moist pellet so as to obtain the carbonaceous pellet. The carbonaceous pellet prepared by the method has high porosity and fixed carbon content.
Description
Technical field
The present invention relates to field of smelting, particularly, relate to silicon field of smelting, more specifically, relate to carbonaceous pelletizing and preparation method thereof.
Background technology
Void content is the important symbol of carbonaceous reducing agent structure, so-called void content refers to the proportionality percentage of pore volume and cumulative volume in carbonaceous reducing agent, the carbonaceous reducing agent resistivity that void content is large is large, surface-area is large, the ability of adsorbed gas is strong, chemically reactive is better, therefore requires that carbonaceous reducing agent will have larger void content.Carbonaceous pelletizing utilizes the granule material of various carbon containing to be suppressed by moulding process, is a kind of product realizing powder comprehensive utilization of resources, is that silicon smelts one of effective reductive agent produced.Traditional carbonaceous pelletizing is pressed into spherical, the shape such as clavate or ellipsoid by adding certain binding agent after various powder in proportion assembly by molding device, it is a kind of carbonaceous product of densification, void content is 2-5%, poor air permeability, because of poor air permeability, affect silicon after dropping into industrial silicon production and smelt the working of a furnace, therefore the application quantity of carbonaceous pelletizing in smelting industrial silicon is produced also be subject to larger restriction, and carbonaceous pelletizing fixed carbon consumption is only 10% of silicon smelting fixed carbon total amount.Powder resource comprehensive utilization utilization ratio is only 46.5%.
Therefore, the preparation method of carbonaceous pelletizing awaits further research.
Summary of the invention
The present invention is intended at least to solve one of technical problem existed in prior art.For this reason, one object of the present invention is to propose a kind of method increasing pelletizing void content, adopt carbonaceous pelletizing prepared by the method, be mainly used in field of smelting, especially smelting industrial silicon field, can solve that conventional carbonaceous pelletizing density is high, poor air permeability, put into production after the working of a furnace worsen, affect production and technical indication, the problems such as carbonaceous pelletizing usage quantity is limited, and resource comprehensive utilization utilization ratio is low.
According to an aspect of the present invention, the invention provides a kind of method preparing carbonaceous pelletizing.According to embodiments of the invention, the method comprises: carbon dust, carbonate and binding agent are mixed, to obtain the first mixture; Described first mixture is carried out mixed grind stir process; Be pressed described first mixture through mixed grind stir process process, to obtain wet bulb; And described wet bulb is carried out air-dry process, to obtain described carbonaceous pelletizing.
The discovery that contriver is surprised, adopt carbonaceous pelletizing prepared by method of the present invention, void content and fixed carbon content high, thus, the density of carbonaceous pelletizing is lower, good permeability, put into production after the working of a furnace good, every production technology performance index, reach the requirement of smelting industrial silicon reductive agent, can in a large number, be widely used in industry smelt, resource comprehensive utilization utilization ratio is high.
According to a further aspect in the invention, present invention also offers a kind of carbonaceous pelletizing.According to embodiments of the invention, described carbonaceous pelletizing utilizes preceding method to prepare.
According to embodiments of the invention, carbonaceous pelletizing of the present invention, void content and fixed carbon content high, thus, the density of carbonaceous pelletizing is lower, good permeability, put into production after the working of a furnace good, every production technology performance index, reach the requirement of smelting industrial silicon reductive agent, can in a large number, be widely used in industry smelt, resource comprehensive utilization utilization ratio is high.
According to embodiments of the invention, utilize carbonaceous pelletizing prepared by method of the present invention, compared with existing conventional carbonaceous pelletizing, at least one of have the following advantages:
(1) void content of carbonaceous pelletizing of the present invention is large, reaches 20-40%, good permeability.
(2) carbonaceous pelletizing of the present invention can be widely used in industrial silicon production, and consumption is large, and powder recovery utilization rate can improve 24-31%.
(3) after carbonaceous pelletizing of the present invention drops into industrial silicon production, the working of a furnace is stablized, and output rises, and day output increases 0.98-1.21%.
Additional aspect of the present invention and advantage will part provide in the following description, and part will become obvious from the following description, or be recognized by practice of the present invention.
Accompanying drawing explanation
Above-mentioned and/or additional aspect of the present invention and advantage will become obvious and easy understand from accompanying drawing below combining to the description of embodiment, wherein:
Fig. 1 shows the schema of the method preparing carbonaceous pelletizing according to an embodiment of the invention.
Embodiment
Be described below in detail embodiments of the invention, the example of described embodiment is shown in the drawings, and wherein same or similar label represents same or similar element or has element that is identical or similar functions from start to finish.Being exemplary below by the embodiment be described with reference to the drawings, only for explaining the present invention, and can not limitation of the present invention being interpreted as.
According to an aspect of the present invention, the invention provides a kind of method preparing carbonaceous pelletizing.With reference to figure 1, the method preparing carbonaceous pelletizing is explained.According to embodiments of the invention, the method comprises:
S100: mixing
According to some embodiments of the present invention, carbon dust, carbonate and binding agent are mixed, to obtain the first mixture.The carbonaceous pelletizing utilizing above-mentioned raw materials to prepare, void content and fixed carbon content high.
According to embodiments of the invention, the kind of binding agent is not particularly limited, as long as can increase the viscosity between carbon dust and carbonate.Such as: pitch and GY moulded coal pelletizing starchy binder etc., preferably, this binding agent is GY moulded coal pelletizing starchy binder.
According to a particular embodiment of the invention, the granularity of described carbon dust and described carbonate is 3mm at the most.Thus, increase the point of contact of carbon dust and carbonate, be conducive to obtaining the intensive pelletizing product of pore.
According to embodiments of the invention, the kind of carbon dust is not particularly limited, described carbon dust is selected from least one of petroleum coke powder, clean fine coal powder, wood charcoal powder, biomass charcoal powder, thus, adopt the carbon dust of mentioned kind, be conducive to the Chemical Composition controlling mixing carbonaceous material, to reach the optimum combination of Chemical Composition, thus assembly goes out preferably pelletizing material.
According to embodiments of the invention, the kind of carbonate is not particularly limited, and described carbonate is selected from least one of sodium carbonate, sodium bicarbonate, calcium carbonate, zinc carbonate and volatile salt.Thus, the void content of pelletizing product can be increased.
According to a particular embodiment of the invention, carbon dust is petroleum coke powder and clean fine coal powder, and carbonate is sodium carbonate.Wherein, the mass ratio of described petroleum coke powder, described clean fine coal powder and described sodium carbonate can be (70-80): (10-20): (2-15).Thus, the carbonaceous pelletizing prepared, void content and fixed carbon content high.
According to a particular embodiment of the invention, described carbon dust is described petroleum coke powder, and described carbonate is described calcium carbonate.Wherein, the mass ratio of described petroleum coke powder and described calcium carbonate is 90:(2-10).Thus, the carbonaceous pelletizing prepared, void content and fixed carbon content high.
S200: mixed grind stir process
According to embodiments of the invention, described first mixture is carried out mixed grind stir process.Thus, utilize binding agent to increase viscosity between ripe carbonate and carbon dust, make the two be easy to agglomerating.
According to a particular embodiment of the invention, mixing pan can be utilized to carry out mixed grind stir process.Thus, mixed grind stir process efficiency is high, effective.
S300: compression moulding process
Be pressed described first mixture through mixed grind stir process process, to obtain wet bulb.Thus, the wet bulb cold strength through compression moulding is high, size even, Chemical Composition is more excellent, meets smelting industrial silicon reductive agent specification of quality.
According to a particular embodiment of the invention, described compression moulding is treated to coldmoulding.
According to a particular embodiment of the invention, the specification of described wet bulb is (20-40) × (30-50) × (5-15) mm, preferably, is 30 × 40 × 10mm.Thus, pellet size meets the requirement of smelting industrial silicon raw meal particle size, and resistivity is large, is conducive to electrode deeply slotting, for the control of smelting industrial silicon stable furnace condition lays the foundation while guarantee furnace charge is ventilative.
S400: air-dry process
Described wet bulb is carried out air-dry process, to obtain described carbonaceous pelletizing.Thus, after air-dry process, pelletizing structure consolidation, not easily loose.
According to a particular embodiment of the invention, the fixed carbon content of described carbonaceous pelletizing is at least 72.8%, and void content is 20-40%.Thus, the density of carbonaceous pelletizing is lower, good permeability, put into production after the working of a furnace good, every production technology performance index, reach the requirement of smelting industrial silicon reductive agent
According to embodiments of the invention, adopt carbonaceous pelletizing prepared by method of the present invention, void content and fixed carbon content high, thus, the density of carbonaceous pelletizing is lower, good permeability, put into production after the working of a furnace good, every production technology performance index, reach the requirement of smelting industrial silicon reductive agent, can in a large number, be widely used in industry smelt, resource comprehensive utilization utilization ratio is high.
According to a further aspect in the invention, present invention also offers a kind of carbonaceous pelletizing.According to embodiments of the invention, described carbonaceous pelletizing utilizes preceding method to prepare.
According to a particular embodiment of the invention, the fixed carbon content of described carbonaceous pelletizing is at least 72.8%, and void content is 20-40%.Thus, the density of carbonaceous pelletizing is lower, good permeability, put into production after the working of a furnace good, every production technology performance index, reach the requirement of smelting industrial silicon reductive agent
According to embodiments of the invention, carbonaceous pelletizing of the present invention, void content and fixed carbon content high, thus, the density of carbonaceous pelletizing is lower, good permeability, put into production after the working of a furnace good, every production technology performance index, reach the requirement of smelting industrial silicon reductive agent, can in a large number, be widely used in industry smelt, resource comprehensive utilization utilization ratio is high.
Below with reference to specific embodiment, the present invention will be described, it should be noted that, these embodiments are only illustrative, and can not be interpreted as limitation of the present invention.
Embodiment 1
Petroleum coke powder, clean fine coal powder and sodium bicarbonate is utilized to prepare the concrete steps of carbonaceous pelletizing as follows:
(1) according to mass percent, granularity is less than the petroleum coke powder of 3mm, clean fine coal powder mixes with the ratio of sodium bicarbonate in 70:20:5, add the conventional binding agent used simultaneously;
(2) mixture that step (1) obtains is carried out mixed grind stirring until mix in mixing pan;
(3) material after mixed grind is sent into the spheroid shape wet bulb being pressed into 30 × 40 × 10mm in tracking forming machine;
(4) wet bulb that step (3) obtains is carried out spontaneous combustion air-dry, obtain carbonaceous pelletizing.
This carbonaceous pelletizing can add smelting industrial silicon electric furnace and do reductive agent use, through detecting: the void content of this carbonaceous pelletizing is 32.67%, fixed carbon content is 72.8%, and all other performance index all reach the requirement of smelting industrial silicon reductive agent.Above-mentioned carbonaceous pelletizing is joined manufacture silicon in smelting industrial silicon mineral hot furnace, add-on accounts for 12.84% of smelting industrial silicon fixed carbon total amount, and every batch of material adds 28kg, and after adding production process, the working of a furnace is stablized, product production increases by 1.21%, and the powder rate of recovery improves 24.5%.
Embodiment 2
Petroleum coke powder, clean fine coal powder and sodium carbonate is utilized to prepare the concrete steps of carbonaceous pelletizing as follows:
(1) according to mass percent, granularity is less than the petroleum coke powder of 3mm, clean fine coal powder mixes with the ratio of sodium carbonate in 80:10:10, add the conventional binding agent used simultaneously;
(2) mixture that step (1) obtains is carried out mixed grind stirring until mix in mixing pan;
(3) material after mixed grind is sent into the spheroid shape wet bulb being pressed into 30 × 40 × 10mm in tracking forming machine;
(4) wet bulb that step (3) obtains is carried out spontaneous combustion air-dry, obtain carbonaceous pelletizing.
This carbonaceous pelletizing can add smelting industrial silicon electric furnace to be made reductive agent and uses, through detecting: the void content of this carbonaceous pelletizing is 33.02%, fixed carbon content 75.58%, and all other performance index all reach the requirement of smelting industrial silicon reductive agent.Above-mentioned pelletizing is joined manufacture silicon in smelting industrial silicon mineral hot furnace, add-on accounts for 13.09% of smelting industrial silicon fixed carbon total amount, and every batch of material adds 27.5kg, and after adding production process, the working of a furnace is stablized, product production increases by 1.02%, and the powder rate of recovery improves 25.8%.
Embodiment 3
Petroleum coke powder and calcium carbonate is utilized to prepare the concrete steps of carbonaceous pelletizing as follows:
(1) according to mass percent, petroleum coke powder granularity being less than 3mm mixes with the ratio of calcium carbonate in 90:5, adds the conventional binding agent used simultaneously;
(2) mixture that step (1) obtains is carried out mixed grind stirring until mix in mixing pan;
(3) material after mixed grind is sent into the spheroid shape wet bulb being pressed into 30 × 40 × 10mm in tracking forming machine;
(4) wet bulb that step (3) obtains is carried out spontaneous combustion air-dry, obtain carbonaceous pelletizing.
This carbonaceous pelletizing can add smelting industrial silicon electric furnace to be made reductive agent and uses, through detecting: the void content of this carbonaceous pelletizing is 35.13%, fixed carbon content 79.2%, and all other performance index all reach the requirement of smelting industrial silicon reductive agent.Above-mentioned pelletizing is joined manufacture silicon in smelting industrial silicon mineral hot furnace, add-on accounts for 15.13% of smelting industrial silicon fixed carbon total amount, and every batch of material adds 30kg, and after adding production process, the working of a furnace is stablized, product production increases by 0.98%, and the powder rate of recovery improves 31%.
In the description of this specification sheets, specific features, structure, material or feature that the description of reference term " embodiment ", " some embodiments ", " example ", " concrete example " or " some examples " etc. means to describe in conjunction with this embodiment or example are contained at least one embodiment of the present invention or example.In this manual, identical embodiment or example are not necessarily referred to the schematic representation of above-mentioned term.And the specific features of description, structure, material or feature can combine in an appropriate manner in any one or more embodiment or example.
Although illustrate and describe embodiments of the invention, those having ordinary skill in the art will appreciate that: can carry out multiple change, amendment, replacement and modification to these embodiments when not departing from principle of the present invention and aim, scope of the present invention is by claim and equivalents thereof.
Claims (10)
1. prepare a method for carbonaceous pelletizing, it is characterized in that, comprising:
Carbon dust, carbonate and binding agent are mixed, to obtain the first mixture;
Described first mixture is carried out mixed grind stir process;
Be pressed described first mixture through mixed grind stir process process, to obtain wet bulb; And
Described wet bulb is carried out air-dry process, to obtain described carbonaceous pelletizing.
2. method according to claim 1, is characterized in that, the granularity of described carbon dust and described carbonate is 3mm at the most.
3. method according to claim 1, is characterized in that, described carbon dust is at least one being selected from petroleum coke powder, clean fine coal powder, wood charcoal powder and biomass charcoal powder,
Optionally, described carbonate is at least one being selected from sodium carbonate, sodium bicarbonate, calcium carbonate, zinc carbonate and volatile salt,
Optionally, described binding agent is GY moulded coal pelletizing starchy binder.
4. method according to claim 3, is characterized in that, described carbon dust is described petroleum coke powder and described clean fine coal powder, and described carbonate is described sodium carbonate.
5. method according to claim 4, is characterized in that, the mass ratio of described petroleum coke powder, described clean fine coal powder and described sodium carbonate is (70-80): (10-20): (2-15).
6. method according to claim 3, is characterized in that, described carbon dust is described petroleum coke powder, and described carbonate is described calcium carbonate.
7. method according to claim 6, is characterized in that, the mass ratio of described petroleum coke powder and described calcium carbonate is 90:(2-10).
8. method according to claim 1, is characterized in that, the specification of described wet bulb is (20-40) × (30-50) × (5-15) mm, preferably, is 30 × 40 × 10mm.
9. method according to claim 1, is characterized in that, the fixed carbon content of described carbonaceous pelletizing is at least 72.8%, and void content is 20-40%.
10. a carbonaceous pelletizing, is characterized in that, described carbonaceous pelletizing utilizes method described in any one of claim 1-9 to prepare,
Optionally, the fixed carbon content of described carbonaceous pelletizing is at least 72.8%, and void content is 20-40%.
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107557094A (en) * | 2017-10-27 | 2018-01-09 | 攀枝花市观诚工贸有限公司 | Briquette binder and preparation method thereof |
| CN112321305A (en) * | 2020-11-06 | 2021-02-05 | 陈晓林 | Multi-bubble ventilating element for refining steel ladle |
| CN112938984A (en) * | 2021-04-09 | 2021-06-11 | 昆明理工大学 | Method for preparing industrial silicon reducing agent based on natural fermentation of biomass and petroleum coke |
| CN113060736A (en) * | 2021-04-12 | 2021-07-02 | 昆明理工大学 | Method for preparing industrial silicon reducing agent by using biomass and additive to synergistically strengthen natural fermentation of petroleum coke |
| CN114854984A (en) * | 2022-04-13 | 2022-08-05 | 昆明理工大学 | Preparation method and application method of composite binder for producing oxidized pellets |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107557094A (en) * | 2017-10-27 | 2018-01-09 | 攀枝花市观诚工贸有限公司 | Briquette binder and preparation method thereof |
| CN112321305A (en) * | 2020-11-06 | 2021-02-05 | 陈晓林 | Multi-bubble ventilating element for refining steel ladle |
| CN112321305B (en) * | 2020-11-06 | 2022-06-03 | 营口四通高温新材料科技有限公司 | Multi-bubble ventilating element for refining steel ladle |
| CN112938984A (en) * | 2021-04-09 | 2021-06-11 | 昆明理工大学 | Method for preparing industrial silicon reducing agent based on natural fermentation of biomass and petroleum coke |
| CN113060736A (en) * | 2021-04-12 | 2021-07-02 | 昆明理工大学 | Method for preparing industrial silicon reducing agent by using biomass and additive to synergistically strengthen natural fermentation of petroleum coke |
| CN114854984A (en) * | 2022-04-13 | 2022-08-05 | 昆明理工大学 | Preparation method and application method of composite binder for producing oxidized pellets |
| CN114854984B (en) * | 2022-04-13 | 2023-08-29 | 昆明理工大学 | Preparation method and application method of composite binder for producing oxidized pellets |
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Application publication date: 20151014 |