CN1398810A - Preheating and decomposing process and plant of preparing electrically molten magnesia outside the furnace - Google Patents
Preheating and decomposing process and plant of preparing electrically molten magnesia outside the furnace Download PDFInfo
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- CN1398810A CN1398810A CN 01127968 CN01127968A CN1398810A CN 1398810 A CN1398810 A CN 1398810A CN 01127968 CN01127968 CN 01127968 CN 01127968 A CN01127968 A CN 01127968A CN 1398810 A CN1398810 A CN 1398810A
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- furnace
- preheating
- arc furnace
- electric arc
- kiln
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Abstract
The present invention relates to the field of refractory material producing technological process and its plant, and especially relates to a preheating and decomposing process and its plant of preparing electrocasting magnesia outside the furnace. The present invention features that the process includes the following steps: decomposing and decarbonizing magnesite in a preheating and decomposing kiln; electrocasting magnesite from the kiln and through heat-resisting steel flow trough into an electrical arc furnace; shifting out of the arc furnace for cooling and separating crystal after the melt inside the furnace reach the furance top, elimianting furnace shell after the melt is cooled inside the furnace for 120-180 deg.C and crushing the final product.
Description
Technical field
The invention belongs to refractory materials production technique and device field thereof, electrically molten magnesia technology and device thereof are produced in the outer pre-thermolysis of particularly a kind of stove.
Electrically molten magnesia is produced, and a kind of is raw material electric smelting method with magnesite, earlier with behind the ore reduction certain particle size, directly sends into and carries out melting in the three-phawse arc furnace, obtains electrically molten magnesia, and content is generally at 95%-98%.Giobertite chemical constitution MgO 47%, CO2 about 51%, and all the other are the oxide compound of impurity F e, Si, Ca.
Giobertite is in electric arc furnace, and electric smelting will be through super-dry, preheating, intensification, decomposition, decarburization, fusion, cooling, crystallization, crystal a series of physical-chemical reaction process such as grow up.
Magnesite will absorb big calorimetric during pre-thermolysis decarburization in stove, just can finish the decomposition carbon rejection process in 850-1350 ℃, and discharge great amount of carbon dioxide gas while in stove outside and also take away a large amount of heat energy.Ore method not only current consumption is big, and the electric smelting time is long, and residual gas also influences crystallization, has reduced the magnesium oxide grade.
Summary of the invention
Technology contents to be solved by this invention is to provide that a kind of device structure is simple, economize on electricity, product yield are higher, and electrically molten magnesia technology and device thereof are produced in the outer pre-thermolysis of stove with low cost.
Technical solution of the present invention can realize according to following mode:
Electrically molten magnesia technology is produced in the outer pre-thermolysis of stove, is characterized in: carry out successively according to following steps:
(A) magnesite is sent into the decomposition kiln by transfer mechanism and carry out pre-thermolysis
Decarburization;
(B) discharge also from the preheating decomposing kiln mouth through the magnesite of pre-thermolysis decarburization
Send into electric arc furnace intensification electric smelting through the high temperature steel chute;
(C) when melt in the electric arc furnace arrives the furnace shell top, shift out electric arc furnace and advance
The row cooling crystallization;
(D) melt, went after the cooling through 120 hours～180 hours in the electric arc furnace
The loss of sheet shell is put the final product cracking and sorting in storage.
Electrically molten magnesia technology required equipment is produced in the outer pre-thermolysis of stove, is characterized in: contain: transfer mechanism, preheating decomposing kiln, high temperature steel chute, removable electric arc furnace, heating electrode, transformer; The outlet of described transfer roller is corresponding with the preheating decomposing kiln feed(raw material)inlet; The outlet of described preheating decomposing kiln is corresponding with the high temperature steel chute; Described heating electrode places in the removable electric arc furnace; Transformer is electrically connected with heating electrode.This equipment is furnished with the used heat gas hood between described heating electrode and preheating decomposing kiln; The end mouth of described used heat gas hood is corresponding with heating electrode; Suitable for reading and the preheating decomposing kiln of used heat gas hood communicates.
Present device is simple in structure, economize on electricity, product yield are higher, with low cost, finished product economize on electricity 45-50% per ton, and hourly output has been turned over one and has been turned over, and product content MgO brings up to 97%～98.5%.
Description of drawings
Fig. 1 is a present device part-structure synoptic diagram;
Fig. 2 is a process flow sheet of the present invention;
Embodiment
As shown in the figure, electrically molten magnesia technology is produced in the outer pre-thermolysis of stove, is characterized in: according to as follows
Steps in sequence is carried out:
(A) magnesite being sent into preheating decomposing kiln by transfer mechanism decomposes
Decarburization;
(B) magnesite that discharges through decomposing decarburization from the preheating decomposing kiln mouth also passes through
The high temperature steel chute is sent into the electric arc furnace fusion;
(C) when melt in the electric arc furnace arrives the furnace shell top, shift out electric arc furnace and advance
The row cooling crystallization;
Melt after the cooling, removed furnace shell through 160 hours in the electric arc furnace, and the final product cracking and sorting is put in storage.
The required device of electrically molten magnesia technology is produced in the outer pre-thermolysis of stove, is characterized in: contain
Have: transfer mechanism 1, preheating decomposing kiln 2, high temperature steel chute 3, removable electric arc furnace
4, heating electrode 5, transformer 6; The outlet of described transfer roller 1 and preheating decomposing kiln 2
The feed(raw material)inlet is corresponding; The outlet of described preheating decomposing kiln 2 is relative with high temperature steel chute 3
Should; Described heating electrode 5 places in the removable electric arc furnace 4; Transformer 6 with add thermoelectricity
The utmost point 5 is electrically connected.The present invention is furnished with between described heating electrode 5 and preheating decomposing kiln 2
Used heat gas hood 14; The end mouth of described used heat gas hood 14 is corresponding with heating electrode 5; Useless
Suitable for reading and the preheating decomposing kiln 2 of hot-air muffler 14 communicates.The present invention is first with magnesite when work
Ore in electric arc furnace during electric smelting, long reaction time, the big pre-thermolysis decarburization of power consumption this
One process shifts out outside the electric arc furnace in advance, carries out in supporting with it decomposition kiln 2.According to melt needs in the electric arc furnace, can will decompose waste heat 500-1000 ℃ of magnesite in back from the decomposition kilneye through high temperature steel chute 3 at any time and send into removable electric arc furnace 4 intensification electric smelting.When melt to the furnace shell top, removable electric arc furnace 4 shifts out cooling, the melt cooling crystallization takes out ultimate product fragmentation, sorting, warehouse-in.As shown in the figure, 8 is the discharge port of preheating decomposing kiln 2; 7 for decomposing the feeding mouth of kiln 2, and 9 is preliminary heating zone, and 10 is decomposition layer, and 11 is thermal insulation layer, and 13 is wicket, and 15 is the preheating decomposing kiln chimney.The waste heat of removable electric arc furnace 4 when work discharged from preheating decomposing kiln chimney 15 through used heat gas hood 14, preheating decomposing kiln 2.
Claims (3)
1, electrically molten magnesia technology is produced in the outer pre-thermolysis of stove, it is characterized in that: carry out successively according to following steps:
(A) magnesite is sent into preheating decomposing kiln by transfer mechanism and decompose decarburization;
(B) magnesite and the process high temperature steel chute that discharges through decomposing decarburization from the preheating decomposing kiln mouth sent into electric arc furnace intensification electric smelting;
(C) when melt in the electric arc furnace arrives the furnace shell top, shift out electric arc furnace and carry out cooling crystallization;
(D) melt removes furnace shell in the electric arc furnace after cooling in 120 hours～180 hours, and the final product cracking and sorting is put in storage.
2, electrically molten magnesia technology required equipment is produced in the outer pre-thermolysis of stove according to claim 1, it is characterized in that: contain: transfer mechanism (1), preheating decomposing kiln (2), high temperature steel chute (3), removable electric arc furnace (4), heating electrode (5), transformer (6); The outlet of described transfer roller (1) is corresponding with preheating decomposing kiln (2) feed(raw material)inlet; The outlet of described preheating decomposing kiln (2) is corresponding with high temperature steel chute (3); Described heating electrode (5) places in the removable electric arc furnace (4); Transformer (6) is electrically connected with heating electrode (5).
3, the electrically molten magnesia device is produced in the outer pre-thermolysis of stove according to claim 2, it is characterized in that: be furnished with used heat gas hood (14) between described heating electrode (5) and pre-thermolysis appearance (2); The end mouth of described used heat gas hood (14) is corresponding with heating electrode (5); Suitable for reading and the preheating decomposing kiln (2) of used heat gas hood (14) communicates.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 01127968 CN1398810A (en) | 2001-07-25 | 2001-07-25 | Preheating and decomposing process and plant of preparing electrically molten magnesia outside the furnace |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 01127968 CN1398810A (en) | 2001-07-25 | 2001-07-25 | Preheating and decomposing process and plant of preparing electrically molten magnesia outside the furnace |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1398810A true CN1398810A (en) | 2003-02-26 |
Family
ID=4667872
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 01127968 Pending CN1398810A (en) | 2001-07-25 | 2001-07-25 | Preheating and decomposing process and plant of preparing electrically molten magnesia outside the furnace |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1398810A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100334025C (en) * | 2005-08-03 | 2007-08-29 | 东北大学 | Method for producing soft firing magnesium oxide using tunnel kiln to calcine magnesite |
| CN104803616A (en) * | 2015-04-17 | 2015-07-29 | 崔凤海 | Macrocrystalline fused magnesite smelting technology |
| CN104803617A (en) * | 2015-04-16 | 2015-07-29 | 辽宁帝诺镁业集团有限公司 | Macrocrystalline fused magnesite smelting furnace |
-
2001
- 2001-07-25 CN CN 01127968 patent/CN1398810A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100334025C (en) * | 2005-08-03 | 2007-08-29 | 东北大学 | Method for producing soft firing magnesium oxide using tunnel kiln to calcine magnesite |
| CN104803617A (en) * | 2015-04-16 | 2015-07-29 | 辽宁帝诺镁业集团有限公司 | Macrocrystalline fused magnesite smelting furnace |
| CN104803616A (en) * | 2015-04-17 | 2015-07-29 | 崔凤海 | Macrocrystalline fused magnesite smelting technology |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |