CN102730706A - Method for stabilizing beta-dicalcium silicate in reducing slag in Pidgeon magnesium smelting process by using phosphorous compound - Google Patents
Method for stabilizing beta-dicalcium silicate in reducing slag in Pidgeon magnesium smelting process by using phosphorous compound Download PDFInfo
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- CN102730706A CN102730706A CN2012102376509A CN201210237650A CN102730706A CN 102730706 A CN102730706 A CN 102730706A CN 2012102376509 A CN2012102376509 A CN 2012102376509A CN 201210237650 A CN201210237650 A CN 201210237650A CN 102730706 A CN102730706 A CN 102730706A
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Abstract
The invention relates to a technology of stability of reducing slag generated in a magnesium smelting process, particularly a method for stabilizing beta-dicalcium silicate in reducing slag in a Pidgeon magnesium smelting process by using a phosphorous compound, which comprises the following steps: pulverizing magnesium slag, passing through a 40-mesh screen, and adding a phosphorous compound as a stabilizer into magnesium reducing slag, wherein the stabilizer accounts for 0.5-14 wt% of the magnesium slag; and thoroughly mixing, pressing to form, roasting the pressed magnesium slag block in a muffle furnace at 1150-1250 DEG C for 3-6 hours, cooling to obtain the magnesium slag block with a certain strength. The invention has the advantages of simple technique and low cost, can convert pulverized magnesium slag powder into the block again, is beneficial to dust-free storage, transportation and further utilization of magnesium slag, and enhances the content of beta-C2S in the magnesium slag. The magnesium slag block can be used as a high-activity magnesium slag concrete admixture or cement admixture, and can also be used as other construction materials.
Description
Technical field
The present invention relates to a kind of volume stability of refining reducing slag that magnesium produces and technology of gelation activity improved, especially relate to a kind of method of stablizing β in the production of magnesium by pidgeonprocess reducing slag-positive Dicalcium Phosphate (Feed Grade) with phosphorus compound.
Background technology
MAGNESIUM METAL 99 and magnesiumalloy are the novel materials given priority to of China in recent years, are widely used in fields such as aerospace, automobile and motorcycle, 3C Product, medical treatment.Ningxia is one of the main MAGNESIUM METAL 99 in the world and magnesiumalloy place of production, is classified as in " national production of magnesium by pidgeonprocess demonstration base " and " national high-quality magnesiumalloy industrial base ".Each magnesium ton MAGNESIUM METAL 99 of Pidgeon process refining will produce 6-8 ton reduction magnesium slag and abbreviate the magnesium slag as.In natural cooling process, the positive Dicalcium Phosphate (Feed Grade) in the magnesium slag can be about 500 ° of C be converted into the γ-C2S of no gelling from the β-C2S with gelling, and this phase transformation causes 12% volumetric expansion, has caused the cracked efflorescence of magnesium clinker.Atomizing magnesium slag is the subparticle dust from flying in stacking, transportation, and ambient air soil water source is all caused very big pollution.In order to overcome the above problems, many researchs and discussion have been carried out.Application number 201110027740.0 adopts the method that adds a small amount of boric acid, has improved the volume stability of magnesium slag with chemical method, solved the problem of granulated slag dust pollution, but boric acid is high as the industrial raw material cost; Application number CN00101520.6 adopts the method for shrend Physical temperature-lowering, the difficult industrial applications that realizes; Application number 200910020830.X is employed in the method that adds the aluminum-containing raw material additive of 3-15% in the MAGNESIUM METAL 99 raw materials for production, carries out the modification of magnesium slag, but still needs the modification magnesium slag that is obtained is cooled off fast.The aluminum-containing raw material additive that in the MAGNESIUM METAL 99 raw materials for production, adds 3-15% also can be smelted the thermodynamics and kinetics condition of reacting to magnesium and produce the influence of can not ignore.
Summary of the invention
The objective of the invention is to overcome the deficiency of prior art, provide a kind of technology the method with β in the steady magnesium-smelting reduction slag of phosphorus compound-positive Dicalcium Phosphate (Feed Grade) simple, with low cost.
The object of the invention is realized through following mode:
A kind of method of stablizing β in the production of magnesium by pidgeonprocess reducing slag-positive Dicalcium Phosphate (Feed Grade) with phosphorus compound; It is characterized in that: this method is: earlier with broken mistake 40 mesh sieves of magnesium ground-slag; The compound that will contain phosphorus then is as stablizer; Join in the magnesium reduction slag, the amount that adds stablizer is the 0.5-14% of magnesium-smelting reduction slag massfraction, the compression moulding behind thorough mixing of this stablizer and magnesium reduction slag; With the magnesium clinker that is pressed under 1150-1250 ° of C high temperature in retort furnace roasting 3-6 hour, can obtain the magnesium clinker of certain intensity after the cooling at last;
Said phosphorated compound can be phosphatic rock or monocalcium phosphate;
The equipment that said compression moulding is adopted is oil press, and pressure range is 150-500 MPa.
The present invention has following effect:
1) process method is unique: method provided by the invention is for adopting phosphatic rock, and monocalcium phosphate etc. contain the compound of phosphorus as stablizer, join in the magnesium reduction slag; The magnesium slag needs first crushing screening, and with compression moulding behind stablizer and the magnesium slag thorough mixing, pressure range is 150-500 MPa then.With the magnesium clinker that is pressed under 1150-1250 ° of C high temperature roasting 3-6 hour, can obtain the magnesium clinker of certain intensity after the cooling.
2) can the magnesium slag that becomes dust be converted into block again, the no dust of being convenient to the magnesium slag is deposited, is transported and further utilizes.Method provided by the invention is with the γ-C in the magnesium slag
2S changes β-C into
2S, because function of stabilizer, the slag charge piece of this moment can chipping efflorescence in temperature-fall period, thereby has avoided the dust pollution of magnesium slag.Contain a large amount of β-C
2The slag charge of S can be used to prepare material of construction, also can increase the additional proportion of magnesium slag as high-activity magnesium slag concrete admixture or cement mixture.β-C2S in the magnesium slag is the later strength of refinforced cement and concrete product significantly.
3) use the block that the present invention can be converted into the production of magnesium by pidgeonprocess reducing slag that becomes dust volume stability again; Eliminated the dust pollution of magnesium slag; Help realizing that the no dust of magnesium slag deposits and transport, can promote the utilization and the circulation of production of magnesium by pidgeonprocess reduction waste residue significantly.
4) in the magnesium slag, add phosphorus compound; And through suitable art breading, can stablize have in the magnesium slag gelling β-C2S phase, make it in cooling, not change γ-C2S into; So promptly prevented the ground-slag phenomenon; Improved the gelation activity of slag again, can it be used for high-activity magnesium slag concrete admixture or cement mixture, also can be used as other building materials and use.
5) the said add-on that contains the stablizer of phosphorus compound is magnesium slag amount fractional 0.5-14%.The add-on of this stablizer can be adjusted between the scope of described 0.5-14% according to this Several Factors of magnesium slag ingredient, maturing temperature, soaking time and cooling time.Can suitably reduce the add-on of this stablizer under the situation high at maturing temperature, that soaking time is long, cooling time is short.
Embodiment
Embodiment one: a kind of method of stablizing β in the production of magnesium by pidgeonprocess reducing slag-positive Dicalcium Phosphate (Feed Grade) with phosphorus compound; Earlier 40 mesh sieves are crossed in the broken back of magnesium ground-slag, then phosphatic rock was pulverized 40 mesh sieves as stablizer after, join in the magnesium reduction slag below 40 orders; The amount that adds stablizer phosphatic rock is a magnesium slag amount fractional 0.5%; Compression moulding behind the two thorough mixing, the equipment that compression moulding is adopted is oil press, pressure range is 150-500 MP; With the magnesium clinker that is pressed under 1150-1250 ° of C high temperature roasting 3-6 hour, the cooling back obtained to have the magnesium clinker of certain intensity at last.
Embodiment two: a kind of method of stablizing β in the production of magnesium by pidgeonprocess reducing slag-positive Dicalcium Phosphate (Feed Grade) with phosphorus compound; Earlier 40 mesh sieves are crossed in the broken back of magnesium ground-slag, then with monocalcium phosphate as stablizer, join in the magnesium reduction slag; The amount that adds the stablizer monocalcium phosphate is a magnesium slag amount fractional 14%; Compression moulding behind the two thorough mixing, the equipment that compression moulding is adopted is oil press, pressure range is 150-500 MP; With the magnesium clinker that is pressed under 1150-1250 ° of C high temperature roasting 3-6 hour, the cooling back obtained to have the magnesium clinker of certain intensity at last.
Embodiment three: a kind of method of stablizing β in the production of magnesium by pidgeonprocess reducing slag-positive Dicalcium Phosphate (Feed Grade) with phosphorus compound; Earlier with broken mistake 40 mesh sieves of magnesium ground-slag, then with monocalcium phosphate as stablizer, join in the magnesium reduction slag below 40 orders; The amount that adds the stablizer monocalcium phosphate is a magnesium slag amount fractional 10%; Compression moulding behind the two thorough mixing, the equipment that compression moulding is adopted is oil press, pressure range is 150-500 MP; With the magnesium clinker that is pressed under 1150-1250 ° of C high temperature roasting 3-6 hour, the cooling back obtained to have the magnesium clinker of certain intensity at last.
Embodiment four: a kind of method of stablizing β in the production of magnesium by pidgeonprocess reducing slag-positive Dicalcium Phosphate (Feed Grade) with phosphorus compound; Earlier 40 mesh sieves are crossed in the broken back of magnesium ground-slag; Joined in the magnesium reduction slag after then monocalcium phosphate being pulverized 40 mesh sieves as stablizer, the amount that adds the stablizer monocalcium phosphate be the magnesium slag massfraction 5%, compression moulding behind the two thorough mixing; The equipment that compression moulding is adopted is oil press; Pressure range is 150-500 MP, and with the magnesium clinker that is pressed under 1150-1250 ° of C high temperature roasting 3-6 hour, the cooling back obtained to have the magnesium clinker of certain intensity at last.
Claims (3)
1. method of stablizing β in the production of magnesium by pidgeonprocess reducing slag-positive Dicalcium Phosphate (Feed Grade) with phosphorus compound; It is characterized in that: this method is: earlier with broken mistake 40 mesh sieves of magnesium ground-slag; The compound that will contain phosphorus then is as stablizer; Join in the magnesium reduction slag, the amount that adds stablizer is the 0.5-14% of magnesium-smelting reduction slag massfraction, the compression moulding behind thorough mixing of this stablizer and magnesium reduction slag; With the magnesium clinker that is pressed under 1150-1250 ° of C high temperature in retort furnace roasting 3-6 hour, can obtain the magnesium clinker of certain intensity after the cooling at last.
2. as claimed in claim 1ly a kind ofly stablize the method for β in the production of magnesium by pidgeonprocess reducing slag-positive Dicalcium Phosphate (Feed Grade) with phosphorus compound, it is characterized in that: said phosphorated compound can be phosphatic rock or monocalcium phosphate.
3. as claimed in claim 1ly a kind ofly stablize the method for β in the production of magnesium by pidgeonprocess reducing slag-positive Dicalcium Phosphate (Feed Grade) with phosphorus compound, it is characterized in that: the equipment that said compression moulding is adopted is oil press, and pressure range is 150-500 MPa.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012102376509A CN102730706A (en) | 2012-07-11 | 2012-07-11 | Method for stabilizing beta-dicalcium silicate in reducing slag in Pidgeon magnesium smelting process by using phosphorous compound |
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| CN2012102376509A CN102730706A (en) | 2012-07-11 | 2012-07-11 | Method for stabilizing beta-dicalcium silicate in reducing slag in Pidgeon magnesium smelting process by using phosphorous compound |
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5913651A (en) * | 1982-07-14 | 1984-01-24 | 大同特殊鋼株式会社 | Electric furnace slag treatment |
| CN102071327A (en) * | 2011-01-26 | 2011-05-25 | 北方民族大学 | Magnesium slag modifier and magnesium slag modification method |
-
2012
- 2012-07-11 CN CN2012102376509A patent/CN102730706A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5913651A (en) * | 1982-07-14 | 1984-01-24 | 大同特殊鋼株式会社 | Electric furnace slag treatment |
| CN102071327A (en) * | 2011-01-26 | 2011-05-25 | 北方民族大学 | Magnesium slag modifier and magnesium slag modification method |
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Application publication date: 20121017 |