CN104973867B - High-purity magnesium oxide dry-type ramming mass used in metal magnesium electrolytic cell - Google Patents
High-purity magnesium oxide dry-type ramming mass used in metal magnesium electrolytic cell Download PDFInfo
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- CN104973867B CN104973867B CN201410143197.4A CN201410143197A CN104973867B CN 104973867 B CN104973867 B CN 104973867B CN 201410143197 A CN201410143197 A CN 201410143197A CN 104973867 B CN104973867 B CN 104973867B
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- fused magnesite
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- seawater magnesia
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Abstract
The invention discloses a high-purity magnesium oxide dry-type ramming mass used in a metal magnesium electrolytic cell. The high-purity magnesium oxide dry-type ramming mass is prepared by blending a composition material from high-purity electric-smelted magnesium sand and sintered seawater magnesium sand and adding a special additive agent to the composition material. The total-filling high-purity magnesium oxide dry-type ramming mass used in the metal magnesium electrolytic cell is free of forming brick seams, so that brick seams formed in masonry of smelted bricks, clay bricks and kieselguhr bricks can be avoided. Meanwhile, high-purity magnesium oxide is excellent in the performance of resisting erosion and permeation of high-temperature electrolytes. The material has certain elasticity and joint-up property since dry-type ramming is employed, so that seams and cracks generated due to expansion and shrinkage caused by temperature fluctuation in the material can be eliminated, thereby ensuring the integrality of a fireproof material at high temperature. The ramming mass is easy and quick to use and is easy to popularize.
Description
Technical field
The present invention relates to metal closing down magnesium electrolysis bath refractory material, and in particular to build by laying bricks or stones in electrolysis production gold to a kind of installation
On category closing down magnesium electrolysis bath, the high-purity magnesium oxide dry type ramming material of electrolyte osmosis is prevented.
Background technology
Magnesium is one of five big light metals, and its alloy is widely used in the fields such as automobile, household electrical appliances, Aeronautics and Astronautics.At present China is
Magnesium metal is produced and big export country, but the refinement of China's magnesium is also present using " Pidgeon process " production technology, the production technology at present
Fall behind, production capacity is low, it is high, seriously polluted to consume energy, this production technology cannot make China become magnesium metal production power.
Fused salt electrolysis process refines magnesium low cost, and raw material sources are the main methods for producing magnesium metal now extensively, the production work
The capital equipment of skill is electrolytic cell, and with strict demand of the country to environmental protection and energy saving, at present the country has gradually adopted molten
Salt electrolysis prepares the production technology of magnesium metal, and the refractory material furnace lining of current electrolysis groove adopts sizing refractory brick, such as：Clay
Brick, molten-cast brick and diatomite brick and aluminosilicate fiberboard are built by laying bricks or stones, and clay brick and molten-cast brick are working lining, diatomite brick and fiberboard
For heat-insulation layer, in use temperature is 650 DEG C of -720 DEG C of electrolyte and magnesium metal easily from clay brick, molten-cast brick and silicon
Diatomaceous earth brick permeates and causes fire-fighting work safety accident and chlorine leakage pollution production of environment accident, while electrolytic cell is impaired can make
Into frequently repairing, the stable and electrowinning process yield of electrolysis process is affected.
The content of the invention
In order to overcome the above-mentioned deficiencies of the prior art, present invention high-purity magnesium oxide dry type ramming material mainly replaces current magnesium
Molten-cast brick and diatomite brick that electrolytic cell is adopted.The presently used product of task layer be molten-cast brick, clay brick and diatomite brick,
Adopt integral-filled high-purity magnesium oxide dry type ramming material in task layer, without 1 brickwork joint, it is to avoid molten-cast brick, clay brick and
Diatomite brick builds produced brickwork joint by laying bricks or stones, while there is extraordinary high temperature resistance electrolyte to corrode infiltration for the high-purity magnesium oxide material
Performance, because the material employs dry type ramming, material has certain elasticity and making up property, can offset because material is in temperature wave
The dilation produced when dynamic and the gap that produces and crackle, so as to ensure that high temperature under refractory material globality.
Scheme of the present invention is：1st, using high-purity fused magnesite（The trade mark is FM985 mass in smelting mark YB/T5266
Standard）With sintering seawater magnesia（The trade mark is FM99 quality standards in smelting mark YB/T5266）As primary raw material, add additive,
Additive is made up of 3 kinds of additives such as low-temperature binder, high temperature sintering agent and high temperature permeability-reducing admixture.2nd, fused magnesite is used into broken
Crusher machine is sieved into the particle that granularity is 3mm-1mm and 1mm-0mm, then is ground into granularity and is sintering seawater magnesia flour mill
≤ 0.088mm and≤0.0325mm fine powders.3rd, by granularity for 3mm-1mm and 1mm-0mm fused magnesite particle and≤0.088mm
With≤0.0325mm seawater magnesia fine powder is sintered according to mass percent precise：Fused magnesite particle 3mm-1mm30%-40%
And 1mm-0mm30%-40%, the fine powder 10%-15% of the fine powder 15%-20% and≤0.0325mm of seawater magnesia≤0.088mm is sintered,
Sintering seawater magnesia and fused magnesite gross mass resultant are 100%, and the addition of additive is sintering seawater magnesia and fused magnesite
The percentage of gross mass（Outer dosage）, the outer dosage of low-temperature binder is the 1%-2% for sintering seawater magnesia and fused magnesite gross mass,
The outer dosage of high temperature sintering agent is the 0.3%-0.8% for sintering seawater magnesia and fused magnesite gross mass, and the outer dosage of high temperature permeability-reducing admixture is
The 2.5%--3.5% of sintering seawater magnesia and fused magnesite gross mass, then will weigh accurately sintering seawater magnesia, electric-melting magnesium
Sand and 3 kinds of additives add vertical forced stirrer mixing 6-8 minutes, are then packed.3rd, adopt when task layer is built by laying bricks or stones
Filled to replace building by laying bricks or stones for sizing refractory brick with dry type ramming material ramming.
The low-temperature binder is magnesium sulfate and high-purity soft burning magnesium dust compound cryosar bonding agent；
The high temperature sintering agent is the metal magnesium powder of passivation；
The high temperature permeability-reducing admixture is magnesium oxide powder.
Obtained dry type ramming material of the invention is used on metal closing down magnesium electrolysis bath, and using effect is better with setting brick than former, is
A novelty of the unshape refractory on closing down magnesium electrolysis bath is used.
The invention has the beneficial effects as follows：
1st, compared with the existing laying fireproof bricks electrolytic cell task layer technology using sizing, replace low using highly-purity magnesite
The schamotte brick higher containing silica and diatomite brick of shelves, it is to avoid more active than metallic silicon at high temperature magnesium metal
Silicon displacement in silica in the low-grade schamotte brick higher containing silica and diatomite brick is caused into fire resisting
The damage of material, so as to improve the using effect of electrolytic cell refractory material.
2nd, task layer is filled using dry type ramming, it is to avoid molten-cast brick, clay brick and diatomite brick build by laying bricks or stones produced by
Brickwork joint, using dry type ramming material, material has certain elasticity and making up property, can offset because material is produced in temperature fluctuation
Dilation and the gap that produces and crackle, so as to ensure that high temperature under refractory material globality, so as to improve electrolytic cell
The using effect of refractory material.
3rd, the magnesia fine and close castable of magnesium dry-type ramming mass and same purity, ramming mass compare thermal conductivity factor with spray paint
To be less than magnesia fine and close castable, ramming mass and the spray paint thermal conductivity factor of same purity, and sizing clay brick and diatomite brick
Comparing comprehensive thermal conductivity factor will height；And highly purified magnesia is used on electrolytic cell, anti-erosion, resistance to slag are good, anti-seepage effect
It is good.
4th, the raw material composition chosen is reasonable, and simple and fast, it is easy to promote the use of is conducive to industrialization production to manufacture and energy-conservation
Consumption reduction.
High-purity magnesium oxide physicochemical property of the present invention see the table below：
Specific embodiment
Embodiment 1
Fused magnesite particle 3mm-1mm40% and 1mm-0mm30%, sintering seawater magnesia≤0.088mm fine powders 15% and≤
0.0325mm fine powders 15%, additive addition is respectively：The outer dosage of low-temperature binder is that sintering seawater magnesia and fused magnesite are total
The 1% of quality, the outer dosage of high temperature sintering agent is sinter seawater magnesia and fused magnesite gross mass 0.5%, and high temperature permeability-reducing admixture is additional
Measure to sinter the 2.5% of sea water magnesia emery dust and fused magnesite gross mass, then will weigh accurately sintering seawater magnesia, electric-melting magnesium
Sand and additive add vertical forced stirrer to mix 6 minutes, are then packed.
Embodiment 2
Fused magnesite particle 3mm-1mm35% and 1mm-0mm35%, sintering seawater magnesia≤0.088mm fine powders 18% and≤
0.0325mm fine powders 12%, additive addition is respectively：The outer dosage of low-temperature binder is that sintering seawater magnesia and fused magnesite are total
The 1.5% of quality, the outer dosage of high temperature sintering agent is sinter seawater magnesia and fused magnesite gross mass 0.8%, outside high temperature permeability-reducing admixture
Dosage is sinter seawater magnesia and fused magnesite gross mass 2.5%, then will weigh accurately sintering seawater magnesia, electric-melting magnesium
Sand and additive add vertical forced stirrer to mix 7 minutes, are then packed.
Embodiment 3
Fused magnesite particle 3mm-1mm35% and 1mm-0mm35%, sintering seawater magnesia≤0.088mm fine powders 20% and≤
0.0325mm fine powders 10%, additive addition is respectively：The outer dosage of low-temperature binder is that sintering seawater magnesia and fused magnesite are total
The 2.0% of quality, the outer dosage of high temperature sintering agent is sinter seawater magnesia and fused magnesite gross mass 0.3%, outside high temperature permeability-reducing admixture
Dosage is sinter seawater magnesia and fused magnesite gross mass 3.5%, then will weigh accurately sintering seawater magnesia, electric-melting magnesium
Sand and additive add vertical forced stirrer to mix 8 minutes, are then packed.
Embodiment 4
Fused magnesite particle 3mm-1mm30% and 1mm-0mm40%, sintering seawater magnesia≤0.088mm fine powders 20% and≤
0.0325mm fine powders 10%, additive addition is respectively：The outer dosage of low-temperature binder is that sintering seawater magnesia and fused magnesite are total
The 1% of quality, the outer dosage of high temperature sintering agent is sinter seawater magnesia and fused magnesite gross mass 0.6%, and high temperature permeability-reducing admixture is additional
Measure to sinter the 2.8% of seawater magnesia and fused magnesite gross mass, then will weigh accurately sintering seawater magnesia, fused magnesite
Add vertical forced stirrer to mix 7 minutes with additive, then packed.
Claims (1)
1. a kind of metal closing down magnesium electrolysis bath high-purity magnesium oxide dry type ramming material, it is characterised in that：Using high-purity fused magnesite and burning
Knot seawater magnesia is primary raw material, adds additive；Raw materials used addition is respectively：Granularity is the fused magnesite of 3mm-1mm
30%-40%, granularity for lmm-0mm fused magnesite 30%-40%, granularity is≤0.088mm sintering seawater magnesia 15%-20%, grain
Spend for≤0.0325mm sintering seawater magnesia 10%-15%, sintering seawater magnesia and fused magnesite gross mass resultant are 100%；It is additional
The addition of agent is the percentage for sintering seawater magnesia and fused magnesite gross mass, and the outer dosage of low-temperature binder is sintering sea water magnesia
The 1%-2% of sand and fused magnesite gross mass, the outer dosage of high temperature sintering agent is sintering seawater magnesia and fused magnesite gross mass
0.3%-0.8%, the outer dosage of high temperature permeability-reducing admixture is the 2.5%-3.5% for sintering seawater magnesia and fused magnesite gross mass；The low temperature
Bonding agent is magnesium sulfate and high-purity soft burning magnesium dust compound cryosar bonding agent；The high temperature sintering agent is the metal magnesium powder of passivation；
The high temperature permeability-reducing admixture is magnesium oxide powder.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410143197.4A CN104973867B (en) | 2014-04-11 | 2014-04-11 | High-purity magnesium oxide dry-type ramming mass used in metal magnesium electrolytic cell |
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| CN201410143197.4A CN104973867B (en) | 2014-04-11 | 2014-04-11 | High-purity magnesium oxide dry-type ramming mass used in metal magnesium electrolytic cell |
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| CN104973867B true CN104973867B (en) | 2017-04-12 |
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| CN108129137A (en) * | 2018-01-12 | 2018-06-08 | 安徽海螺暹罗耐火材料有限公司 | Large-scale cement rotary kiln composite magnesium aluminate spinel brick and its production method |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1180679A (en) * | 1996-10-24 | 1998-05-06 | 周季楠 | Antierosion fireproof material for aluminium electrolyzer |
| CN102674857A (en) * | 2012-05-22 | 2012-09-19 | 武汉科技大学 | Magnesium composite material for side wall of upper part of aluminum electrolytic cell and preparation method of magnesium composite material |
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2014
- 2014-04-11 CN CN201410143197.4A patent/CN104973867B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1180679A (en) * | 1996-10-24 | 1998-05-06 | 周季楠 | Antierosion fireproof material for aluminium electrolyzer |
| CN102674857A (en) * | 2012-05-22 | 2012-09-19 | 武汉科技大学 | Magnesium composite material for side wall of upper part of aluminum electrolytic cell and preparation method of magnesium composite material |
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Address after: 471039, Xiyuan Road, Jianxi District, Henan, Luoyang Patentee after: Sinosteel luonai New Material Technology Co., Ltd Address before: 471039, Xiyuan Road, Jianxi District, Henan, Luoyang Patentee before: SiNOSTEEL Refractory Co., Ltd. |
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Address after: 471039, Xiyuan Road, Jianxi District, Henan, Luoyang Patentee after: Sinosteel luonai Technology Co., Ltd Address before: 471039, Xiyuan Road, Jianxi District, Henan, Luoyang Patentee before: Sinosteel luonai New Material Technology Co.,Ltd. |
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