CN100369846C - Preparation method of magnesium calcium clinker - Google Patents
Preparation method of magnesium calcium clinker Download PDFInfo
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- CN100369846C CN100369846C CNB2006100473551A CN200610047355A CN100369846C CN 100369846 C CN100369846 C CN 100369846C CN B2006100473551 A CNB2006100473551 A CN B2006100473551A CN 200610047355 A CN200610047355 A CN 200610047355A CN 100369846 C CN100369846 C CN 100369846C
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Abstract
The present invention relates to a preparation method of calcium-magnesium clinker. Said method includes the following steps: using magnesite and limestone as raw material, soft burning at 800-100deg.C, cooling, hydration, ball-grinding and wet mixing, filtering, carbonating, drying, forming and calcining at 1600-1900deg.C so as to obtain the invented calcium-magnesium clinker.
Description
Technical field
The present invention relates to the refractory materials production technical field, be specifically related to the preparation method of calcium-magnesium clinker.
Background technology
In recent years, along with the requirement that Clean Steel is smelted, the environment for use of refractory materials harsh day by day (as use temperature height, refining cycle length etc.), the alkaline oxygenated material that contains free calcium oxide is generally paid attention to because of the effect of the good and good purify hot metal of its high-temperature stability, wherein, the magnesium lime refractory is able to widespread use as refining unit with refractory materials, and calcium-magnesium clinker promptly is a main raw material of producing this magnesium lime refractory.
Producing the traditional method of the calcareous grog of magnesium, is raw material with magnesite and Wingdale at first, and these two kinds of mineral are light-burned under lower temperature respectively, makes light calcined magnesia and light-burned calcium oxide; Then two kinds of light-burned oxide compounds are carried out by a certain percentage proportioning and carry out ball milling and do to mix, moulding, and heavily burn at 1800～2000 ℃, make the reburned magnesia calcium clinker; With after the calcium-magnesium clinker fragmentation, pressing certain particle size grating, moulding, 1800～2000 ℃ of calcinings again finally make calcium-magnesium clinker more at last.Mix because light calcined magnesia and light-burned calcium oxide are dry types, mixed effect is subjected to certain restriction.In addition, because MgO-CaO eutectic temperature very high (2370 ℃), even two kinds of mineral dissolve each other but because the identical acceleration of sintering effectively of valence state under the hot conditions.Therefore, in order to obtain fine and close calcium-magnesium clinker, need twice high temperature to burn till, it is all the more so particularly to produce highly purified high-quality calcium-magnesium clinker.This will cause a large amount of energy consumptions, increases investment and production cost.Though add the sintering fusing assistant by forming low melting point phase acceleration of sintering effectively, reduce calcining temperature, the generation of low melting point phase will influence the high-temperature behavior of refractory materials.Therefore, exploitation less energy-consumption production high-quality magnesium calcium who knows that method has crucial meaning.
On the other hand,,, at present the utilization of magnesite is not only existed and gets richness and abandon poor problem although China's reserves are abundant as the main raw material magnesite of producing calcium magnesia sand, and in recovery process a large amount of fine ores of generation, account for 30～40% of extracted ore.These fine ores are not used, and not only take a large amount of Agricultural lands, cause environmental pollution, also have a strong impact on the high-efficiency comprehensive utilization of China's magnesite resource, and rationally the magnesite resource of high-efficiency comprehensive utilization China is the major issue that China needs to be resolved hurrily at present.
Summary of the invention
At existing technological deficiency and the present unavailable present situation of magnesite powder of producing calcium-magnesium clinker, the invention provides a kind of high purity, high-compactness, the low preparation method who burns till the calcium-magnesium clinker of temperature.
The present invention is a raw material with magnesite and limestone mine, makes calcium-magnesium clinker by light-burned, cooling, aquation, ball milling wet mixing, filtration, carbonating, drying, moulding, calcining process, especially can utilize the magnesite fine ore.Concrete technology is as follows:
1. light-burned.Magnesite raw material and limestone mine raw material respectively in rotary kiln, suspension roasting kiln, multiple bedded furnace, fluidizing furnace or reverberatory furnace, are used ash-free fuel under 800～1000 ℃ of conditions light-burned 1～2 hour, make light calcined magnesia and soft burnt lime respectively.In sintering process, following main chemical reactions takes place:
MgCO
3→MgO+CO
2
CaCO
3→CaO+CO
2
2. cooling.Mineral after light-burned naturally cool to 100～200 ℃ in air.
3. aquation.Cooled light calcined magnesia and soft burnt lime are prepared burden by certain metering proportion, make CaO content account for 10～25% of total mineral by weight percentage.Two kinds of mineral that weigh up are put into 3～5 times together in the normal-temperature water of mineral volume, make CaO and MgO aquation in the mineral.Aquation is handled 20～40min, and its main chemical reactions is as follows.
MgO+H
2O→Mg(OH)
2
CaO+H
2O→Ca(OH)
2
4. mix.The material that 3. above-mentioned steps is obtained comprises that mineral and water directly join in the ball mill, ball milling 2～3 hours.In the mechanical milling process, magnesium oxide and lime carry out wet mixing, and above-mentioned hydration reaction is proceeded simultaneously.
5. filter.Slurry behind the ball milling is filtered, discard filter residue, mineral granularity is less than 40 μ m in the filtrate.
6. carbonating.Slurry behind ball milling water in tank is further diluted, make the volume of diluting water equal 5～8 times of mineral volume, make the mixing supersaturated solution of magnesium hydroxide and calcium hydroxide, and heating makes solution temperature rise to 30～60 ℃.In mixed solution, be that 50～1000L/min (with respect to 1000L solution) is blown into CO when stirring with flow
2Gas makes the generation carbonation reaction.In carbonation, magnesia mineral and calcareous mineral further mix.Wherein, principal reaction formula is as follows.
Mg(OH)
2+CO
2→MgCO
3↓+H
2O
Ca(OH)
2+CO
2→CaCO
3↓+H
2O
7. dry.With the sedimentation and filtration that makes behind the abundant carbonation reaction, and with filter cake drying treatment 12～24 hours under 100～200 ℃ of conditions.
8. ball milling.Dried filter cake ball milling to granularity≤120 μ m, is made the mixed powder of Magnesium Carbonate Light 41-45 and light calcium carbonate.
9. moulding.8. the lightweight mixed mineral that obtains with step is a raw material, presses down ball forming in 150～300MPa pressure condition.
10. calcining.The mineral of moulding are put into shaft furnace or rotary kiln, adopt the ash-free fuel calcining, under 1600～1900 ℃ of conditions, calcined 2～5 hours, make the mineral structure densification, obtain the high-density calcium-magnesium clinker at last.
An important indicator that characterizes calcium-magnesium clinker sintering degree is a volume density.Its calculation formula is as follows:
In the formula
D
bThe volume density of one refractory materials, g/cm
3
m
1The quality of one dry sample, g;
m
2The apparent mass of one saturated sample, g;
m
3The aerial quality of one saturated sample, g;
D
L-under test temperature, the density of steeping liq, g/cm
3
Volume density has reflected the compactness extent of goods intuitively, and it is the important measurement index of refractory materials dense product quality level.Its mensuration scheme is called the hydrostatic weighing method.Concrete steps are: the quality m that 1. measures dry sample
12. sample is immersed in the liquid, container is vacuumized, being evacuated to sample does not have bubble to emit, and turns off vacuum pump, and container is placed air, measures the quality m of specimen suspension in liquid
23. from immersion liquid, take out sample, remove the unnecessary liquid that specimen surface adheres to, claim then the aerial quality m of saturated sample
3
The characteristics of the inventive method are to utilize the sintering activity of light magnesium oxide and lightweight lime, need not any sintering aids that adds, under lower temperature, can make fine and close high-purity calcium-magnesium clinker, can reduce production costs effectively, improve clinker quality by one-step calcination.In above-mentioned steps filtration link 5., the impurity component that can elimination partly be difficult for aquation, can promote the raising of calcium-magnesium clinker purity effectively, can utilize MgO content greater than 45% magnesite, CaO content greater than 53% limestone mine production high-quality calcium-magnesium clinker.Production process does not have dust and produces, and can not pollute environment, suits especially to utilize the magnesite fine ore, can promote the reasonable high-efficiency comprehensive utilization of China's magnesite resource effectively.
Embodiment
Embodiment 1
(size range 0.001～40mm) and Zhejiang Hangzhou limestone mine are raw material, and its chemical constitution is as shown in table 1 to adopt the discarded magnesite fine ore in Dashiqiao, Liaoning.
Table 1 is implemented the physical and chemical index (%) with the magnesite fine ore
| MgO | CaO | SiO 2 | Al 2O 3 | Fe 2O 3 | LOI | |
| Magnesite | 46.56 | 0.41 | 1.38 | 0.25 | 0.47 | 50.92 |
| Wingdale | 0.08 | 55.08 | 0.28 | 0.75 | 0.04 | 43.65 |
1. light-burned.In rotary kiln, suspension roasting kiln, multiple bedded furnace, fluidizing furnace or reverberatory furnace, add above-mentioned raw materials, use ash-free fuel under 1000 ℃ of conditions light-burned 1 hour.
2. cooling.Mineral after light-burned naturally cool to 100 ℃ in air.
3. aquation.Cooled light calcined magnesia and soft burnt lime are prepared burden by certain metering proportion, make CaO content account for 15% of total mineral by weight percentage.Two kinds of mineral that weigh up are put into 4 times together in the normal-temperature water of mineral volume, and aquation is handled 30min, makes the MgO aquation in the mineral.
4. the material that 3. above-mentioned steps is obtained comprises that mineral and water directly join ball mill, ball milling 2 hours.
5. filter.Slurry behind the ball milling is filtered, remove filter residue, mineral granularity reaches less than 40 μ m in the filtrate.
6. carbonating.Slurry behind ball milling water in tank is further diluted, make the volume of water equal 8 times of mineral volumes, make the mixing supersaturated solution of magnesium hydroxide and calcium hydroxide, and heating makes solution temperature rise to 40 ℃.In mixed solution, be that 300L/min (with respect to 1000L solution) is blown into CO when stirring with the flow
2Gas makes the generation carbonation reaction.
7. dry.With the sedimentation and filtration that makes behind the abundant carbonation reaction, and with filter cake drying treatment 24 hours under 120 ℃ of conditions.
8. ball milling.Dried filter cake ball milling to granularity≤120 μ m, is made the mixed powder of Magnesium Carbonate Light 41-45 and light calcium carbonate.
9. moulding.The lightweight mixed mineral that 8. step is obtained is that raw material presses down ball forming in the 150MPa pressure condition.
10. calcining.The mineral of moulding are put into shaft furnace or rotary kiln, adopt the ash-free fuel calcining, calcining is 3 hours under 1600 ℃ of conditions, obtains MgO+CaO＞98.0%, and volume density is greater than 3.39g/cm
3Calcium-magnesium clinker.
Embodiment 2
The magnesite fine ore and the limestone mine that adopt with embodiment 1 are raw material.
1. light-burned.In rotary kiln, suspension roasting kiln, multiple bedded furnace, fluidizing furnace or reverberatory furnace, add above-mentioned raw materials, use ash-free fuel under 800 ℃ of conditions light-burned 2 hours.
2. cooling.Naturally cool to 100 ℃ in the sub-air of mineral after light-burned.
3. aquation.Cooled light calcined magnesia and soft burnt lime are prepared burden by certain metering proportion, make CaO content account for 15% of total mineral by weight percentage.Two kinds of mineral that weigh up are put into 4 times together in the normal-temperature water of mineral volume, and aquation is handled 40min, makes the MgO aquation in the mineral.
4. the material that 3. above-mentioned steps is obtained comprises that mineral and water directly join ball mill, ball milling 2 hours.
5. filter.Slurry behind the ball milling is filtered, remove filter residue, mineral granularity reaches less than 40 μ m in the filtrate.
6. carbonating.Slurry behind ball milling water in tank is further diluted, make the volume of water equal 8 times of mineral volumes, make the mixing supersaturated solution of magnesium hydroxide and calcium hydroxide, and heating makes solution temperature rise to 60 ℃.In mixed solution, be that 300L/min (with respect to 1000L solution) is blown into CO when stirring with the flow
2Gas makes the generation carbonation reaction.
7. dry.With the sedimentation and filtration that makes behind the abundant carbonation reaction, and with filter cake drying treatment 24 hours under 120 ℃ of conditions.
8. ball milling.Dried filter cake ball milling to granularity≤120 μ m, is made the mixed powder of Magnesium Carbonate Light 41-45 and light calcium carbonate.
9. moulding.The lightweight mixed mineral that 8. step is obtained is that raw material presses down ball forming in the 150MPa pressure condition.
10. calcining.The mineral of moulding are put into shaft furnace or rotary kiln, adopt the ash-free fuel calcining, calcining is 3 hours under 1600 ℃ of conditions, obtains MgO+CaO＞98.0%, and volume density is greater than 3.41g/cm
3Calcium-magnesium clinker.
Embodiment 3
The magnesite fine ore and the limestone mine that adopt with embodiment 1 are raw material.
1. light-burned.In rotary kiln, suspension roasting kiln, multiple bedded furnace, fluidizing furnace or reverberatory furnace, add above-mentioned raw materials, use ash-free fuel under 900 ℃ of conditions light-burned 1.5 hours.
2. cooling.Mineral after light-burned naturally cool to 150 ℃ in air.
3. aquation.Cooled light calcined magnesia and soft burnt lime are prepared burden by certain metering proportion, make CaO content account for 25% of total mineral by weight percentage.Two kinds of mineral that weigh up are put into 4 times together in the normal-temperature water of mineral volume, and aquation is handled 20min, makes the MgO aquation in the mineral.
4. the material that 3. above-mentioned steps is obtained comprises that mineral and water directly join ball mill, ball milling 2 hours.
5. filter.Slurry behind the ball milling is filtered, remove filter residue, mineral granularity reaches less than 40 μ m in the filtrate.
6. carbonating.Slurry behind the ball milling is further diluted with 60 ℃ of water in tank, make the volume of water equal 8 times of mineral volumes, make the mixing supersaturated solution of magnesium hydroxide and calcium hydroxide.In mixed solution, be that 300L/min (with respect to 1000L solution) is blown into CO when stirring with the flow
2Gas makes the generation carbonation reaction.
7. dry.With the sedimentation and filtration that makes behind the abundant carbonation reaction, and with filter cake drying treatment 24 hours under 120 ℃ of conditions.
8. ball milling.Dried filter cake ball milling to granularity≤120 μ m, is made the mixed powder of Magnesium Carbonate Light 41-45 and light calcium carbonate.
9. moulding.The lightweight mixed mineral that 8. step is obtained is that raw material presses down ball forming in the 150MPa pressure condition.
10. calcining.The mineral of moulding are put into shaft furnace or rotary kiln, adopt the ash-free fuel calcining, calcining is 5 hours under 1600 ℃ of conditions, obtains MgO+CaO＞98.0%, and volume density is greater than 3.42g/cm
3Calcium-magnesium clinker.
Embodiment 4
The magnesite fine ore and the limestone mine that adopt with embodiment 1 are raw material.
1. light-burned.In rotary kiln, suspension roasting kiln, multiple bedded furnace, fluidizing furnace or reverberatory furnace, add above-mentioned raw materials, use ash-free fuel under 1000 ℃ of conditions light-burned 1 hour.
2. cooling.Mineral after light-burned naturally cool to 200 ℃ in air.
3. aquation.Cooled light calcined magnesia and soft burnt lime are prepared burden by certain metering proportion, make CaO content account for 20% of total mineral by weight percentage.Two kinds of mineral that weigh up are put into 3 times together in the normal-temperature water of mineral volume, and aquation is handled 40min, makes the MgO aquation in the mineral.
4. the material that 3. above-mentioned steps is obtained comprises that mineral and water directly join ball mill, ball milling 3 hours.
5. filter.Slurry behind the ball milling is filtered, remove filter residue, mineral granularity reaches less than 40 μ m in the filtrate.
6. carbonating.Slurry behind ball milling water in tank is further diluted, make the volume of water equal 5 times of mineral volumes, make the mixing supersaturated solution of magnesium hydroxide and calcium hydroxide, and heating makes solution temperature rise to 60 ℃.In mixed solution, be that 500L/min is with respect to 1000L solution when stirring with the flow) be blown into CO
2Gas makes the generation carbonation reaction.
7. dry.With the sedimentation and filtration that makes behind the abundant carbonation reaction, and with filter cake drying treatment 24 hours under 100 ℃ of conditions.
8. ball milling.Dried filter cake ball milling to granularity≤120 μ m, is made the mixed powder of Magnesium Carbonate Light 41-45 and light calcium carbonate.
9. moulding.The lightweight mixed mineral that 8. step is obtained is that raw material presses down ball forming in the 150MPa pressure condition.
10. calcining.The mineral of moulding are put into shaft furnace or rotary kiln, adopt the ash-free fuel calcining, calcining is 5 hours under 1600 ℃ of conditions, obtains MgO+CaO＞98.0%, and volume density is greater than 3.37g/cm
3Calcium-magnesium clinker.
Embodiment 5
The magnesite fine ore and the limestone mine that adopt with embodiment 1 are raw material.
1. light-burned.In rotary kiln, suspension roasting kiln, multiple bedded furnace, fluidizing furnace or reverberatory furnace, add above-mentioned raw materials, use ash-free fuel under 1000 ℃ of conditions light-burned 1 hour.
2. cooling.Mineral after light-burned naturally cool to 100 ℃ in air.
3. aquation.Cooled light calcined magnesia and soft burnt lime are prepared burden by certain metering proportion, make CaO content account for 10% of total mineral by weight percentage.Two kinds of mineral that weigh up are put into 5 times together in the normal-temperature water of mineral volume, and aquation is handled 30min, makes the MgO aquation in the mineral.
4. the material that 3. above-mentioned steps is obtained comprises that mineral and water directly join ball mill, ball milling 2.5 hours.
5. filter.Slurry behind the ball milling is filtered, remove filter residue, mineral granularity reaches less than 40 μ m in the filtrate.
6. carbonating.Slurry behind ball milling water in tank is further diluted, make the volume of water equal 6 times of mineral volumes, make the mixing supersaturated solution of magnesium hydroxide and calcium hydroxide, and heating makes solution temperature rise to 60 ℃.In mixed solution, be that 200L/min (with respect to 1000L solution) is blown into CO when stirring with the flow
2Gas makes the generation carbonation reaction.
7. dry.With the sedimentation and filtration that makes behind the abundant carbonation reaction, and with filter cake drying treatment 12 hours under 200 ℃ of conditions.
8. ball milling.Dried filter cake ball milling to granularity≤120m, is made the mixed powder of Magnesium Carbonate Light 41-45 and light calcium carbonate.
9. moulding.The lightweight mixed mineral that 8. step is obtained is that raw material presses down ball forming in the 300MPa pressure condition.
10. calcining.The mineral of moulding are put into shaft furnace or rotary kiln, adopt the ash-free fuel calcining, calcining is 3 hours under 1700 ℃ of conditions, obtains MgO+CaO＞98.0%, and volume density is 3.41g/cm
3Calcium-magnesium clinker.
Embodiment 6
The magnesite fine ore and the limestone mine that adopt with embodiment 1 are raw material.
1. light-burned.In rotary kiln, suspension roasting kiln, multiple bedded furnace, fluidizing furnace or reverberatory furnace, add above-mentioned raw materials, use ash-free fuel under 1000 ℃ of conditions light-burned 1 hour.
2. cooling.Mineral after light-burned naturally cool to 100 ℃ in air.
3. aquation.Cooled light calcined magnesia and soft burnt lime are prepared burden by certain metering proportion, make CaO content account for 20% of total mineral by weight percentage.Two kinds of mineral that weigh up are put into 4 times together in the normal-temperature water of mineral volume, and aquation is handled 30min, makes the MgO aquation in the mineral.
4. the material that 3. above-mentioned steps is obtained comprises that mineral and water directly join ball mill, ball milling 3 hours.
5. filter.Slurry behind the ball milling is filtered, remove filter residue, mineral granularity reaches less than 40 μ m in the filtrate.
6. carbonating.Slurry behind ball milling water in tank is further diluted, make the volume of water equal 7 times of mineral volumes, make the mixing supersaturated solution of magnesium hydroxide and calcium hydroxide, and heating makes solution temperature rise to 30 ℃.In mixed solution, be that 50L/min (with respect to 1000L solution) is blown into CO when stirring with the flow
2Gas makes the generation carbonation reaction.
7. dry.With the sedimentation and filtration that makes behind the abundant carbonation reaction, and with filter cake drying treatment 18 hours under 150 ℃ of conditions.
8. ball milling.Dried filter cake ball milling to granularity≤120 μ m, is made the mixed powder of Magnesium Carbonate Light 41-45 and light calcium carbonate.
9. moulding.The lightweight mixed mineral that 8. step is obtained is that raw material presses down ball forming in the 180MPa pressure condition.
10. calcining.The mineral of moulding are put into shaft furnace or rotary kiln, adopt the ash-free fuel calcining, calcining is 3 hours under 1700 ℃ of conditions, obtains MgO+CaO＞98.0%, and volume density is greater than 3.42g/cm
3Calcium-magnesium clinker.
Embodiment 7
The magnesite fine ore and the limestone mine that adopt with embodiment 1 are raw material.
1. light-burned.In rotary kiln, suspension roasting kiln, multiple bedded furnace, fluidizing furnace or reverberatory furnace, add above-mentioned raw materials, use ash-free fuel under 1000 ℃ of conditions light-burned 1 hour.
2. cooling.Mineral after light-burned naturally cool to 100 ℃ in air.
3. aquation.Cooled light calcined magnesia and soft burnt lime are prepared burden by certain metering proportion, make CaO content account for 25% of total mineral by weight percentage.Two kinds of mineral that weigh up are put into 4 times together in the normal-temperature water of mineral volume, and aquation is handled 40min, makes the MgO aquation in the mineral.
4. the material that 3. above-mentioned steps is obtained comprises that mineral and water directly join ball mill, ball milling 2.5 hours.
5. filter.Slurry behind the ball milling is filtered, remove filter residue, mineral granularity reaches less than 40 μ m in the filtrate.
6. carbonating.Slurry behind ball milling water in tank is further diluted, make the volume of water equal 8 times of mineral volumes, make the mixing supersaturated solution of magnesium hydroxide and calcium hydroxide, and heating makes solution temperature rise to 50 ℃.In mixed solution, be that 700L/min (with respect to 1000L solution) is blown into CO when stirring with the flow
2Gas makes the generation carbonation reaction.
7. dry.With the sedimentation and filtration that makes behind the abundant carbonation reaction, and with filter cake drying treatment 18 hours under 120 ℃ of conditions.
8. ball milling.Dried filter cake ball milling to granularity≤120 μ m, is made the mixed powder of Magnesium Carbonate Light 41-45 and light calcium carbonate.
9. moulding.The lightweight mixed mineral that 8. step is obtained is that raw material presses down ball forming in the 200MPa pressure condition.
10. calcining.The mineral of moulding are put into shaft furnace or rotary kiln, adopt the ash-free fuel calcining, calcining is 3 hours under 1900 ℃ of conditions, obtains MgO+CaO＞98.0%, and volume density is greater than 3.38g/cm
3Calcium-magnesium clinker.
Embodiment 8
The magnesite fine ore and the limestone mine that adopt with embodiment 1 are raw material.
1. light-burned.In rotary kiln, suspension roasting kiln, multiple bedded furnace, fluidizing furnace or reverberatory furnace, add above-mentioned raw materials, use ash-free fuel under 1000 ℃ of conditions light-burned 1 hour.
2. cooling.Mineral after light-burned naturally cool to 100 ℃ in air.
3. aquation.Cooled light calcined magnesia and soft burnt lime are prepared burden by certain metering proportion, make CaO content account for 18% of total mineral by weight percentage.Two kinds of mineral that weigh up are put into 3 times together in the normal-temperature water of mineral volume, and aquation is handled 20min, makes the MgO aquation in the mineral.
4. the material that 3. above-mentioned steps is obtained comprises that mineral and water directly join ball mill, ball milling 2 hours.
5. filter.Slurry behind the ball milling is filtered, remove filter residue, mineral granularity reaches less than 40 μ m in the filtrate.
6. carbonating.Slurry behind ball milling water in tank is further diluted, make the volume of water equal 8 times of mineral volumes, make the mixing supersaturated solution of magnesium hydroxide and calcium hydroxide, and heating makes solution temperature rise to 60 ℃.In mixed solution, be that 1000L/min (with respect to 1000L solution) is blown into CO when stirring with the flow
2Gas makes the generation carbonation reaction.
7. dry.With the sedimentation and filtration that makes behind the abundant carbonation reaction, and with filter cake drying treatment 24 hours under 120 ℃ of conditions.
8. ball milling.Dried filter cake ball milling to granularity≤120 μ m, is made the mixed powder of Magnesium Carbonate Light 41-45 and light calcium carbonate.
9. moulding.The lightweight mixed mineral that 8. step is obtained is that raw material presses down ball forming in the 250MPa pressure condition.
10. calcining.The mineral of moulding are put into shaft furnace or rotary kiln, adopt the ash-free fuel calcining, calcining is 4 hours under 1800 ℃ of conditions, obtains MgO+CaO＞98.0%, and volume density is greater than 3.36g/cm
3Calcium-magnesium clinker.
Claims (2)
1. the preparation method of a calcium-magnesium clinker is characterized in that with magnesite and limestone mine be raw material, adopts following technology:
1. light-burned, magnesite raw material and limestone mine raw material respectively in rotary kiln, suspension roasting kiln, multiple bedded furnace, fluidizing furnace or reverberatory furnace, are used ash-free fuel under 800～1000 ℃ of conditions light-burned 1～2 hour, make light calcined magnesia and soft burnt lime respectively;
2. cooling, the mineral after light-burned naturally cool to 100～200 ℃ in air;
3. aquation, cooled light calcined magnesia and soft burnt lime are prepared burden by certain metering proportion, make CaO content account for 10～25% of total mineral by weight percentage, two kinds of mineral that weigh up are put into 3～5 times together in the normal-temperature water of mineral volume, handle 20～40min;
4. mix, the material that 3. step is obtained comprises that mineral and water directly join in the ball mill, ball milling 2～3 hours;
5. filter, the slurry behind the ball milling is filtered, discard filter residue, mineral granularity is less than 40 μ m in the filtrate;
6. carbonating, slurry behind ball milling water in tank is further diluted, make the volume of diluting water equal 5～8 times of mineral volume, make the mixing supersaturated solution of magnesium hydroxide and calcium hydroxide, and the heating make solution temperature rise to 30～60 ℃, being blown into flow in the time of stirring in mixed solution is the CO of 50～1000L/min with respect to 1000L solution
2Gas;
7. dry, with the sedimentation and filtration that makes behind the abundant carbonation reaction, and with filter cake drying treatment 12～24 hours under 100～200 ℃ of conditions;
8. ball milling to granularity≤120 μ m, makes the mixed powder of Magnesium Carbonate Light 41-45 and light calcium carbonate with dried filter cake ball milling;
9. moulding, the lightweight mixed mineral that 8. obtains with step is a raw material, presses down ball forming in 150～300MPa pressure condition;
10. calcining is put into shaft furnace or rotary kiln with the mineral of moulding, adopts the ash-free fuel calcining, calcines 2～5 hours under 1600～1900 ℃ of conditions, obtains the high-density calcium-magnesium clinker.
2. according to the preparation method of the described calcium-magnesium clinker of claim 1, the raw material magnesite MgO content that it is characterized in that being utilized is greater than 45%, and limestone mine CaO content is greater than 53%.
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| CN106630968B (en) * | 2016-09-26 | 2019-03-19 | 武汉科技大学 | A kind of densification periclase spherolite and preparation method thereof |
| CN108675735A (en) * | 2018-05-08 | 2018-10-19 | 山西大学 | A kind of preparation method of solid waste carbonating foamed concrete |
| CN113683326B (en) * | 2021-09-22 | 2022-11-18 | 西南科技大学 | Air-hardening inorganic cementing material and preparation method thereof |
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| CN1174180A (en) * | 1996-08-21 | 1998-02-25 | 冶金部洛阳耐火材料研究院 | Hydration resisting magnesium-calcium clinker and its production process |
| CN1539774A (en) * | 2003-10-31 | 2004-10-27 | 清华大学 | Method for preparing Nano magnesia from calcining light burning powder of magnesite |
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| CN1174180A (en) * | 1996-08-21 | 1998-02-25 | 冶金部洛阳耐火材料研究院 | Hydration resisting magnesium-calcium clinker and its production process |
| CN1539774A (en) * | 2003-10-31 | 2004-10-27 | 清华大学 | Method for preparing Nano magnesia from calcining light burning powder of magnesite |
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| CN101747015B (en) * | 2008-12-05 | 2012-04-18 | 沈阳有色冶金设计研究院 | Inorganic wooden building board and production method thereof |
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| CN1903769A (en) | 2007-01-31 |
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