CN104961473A - Method for producing export magnesium-rich olivine sand with MgO content less than 70% - Google Patents
Method for producing export magnesium-rich olivine sand with MgO content less than 70% Download PDFInfo
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- CN104961473A CN104961473A CN201510297623.4A CN201510297623A CN104961473A CN 104961473 A CN104961473 A CN 104961473A CN 201510297623 A CN201510297623 A CN 201510297623A CN 104961473 A CN104961473 A CN 104961473A
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Abstract
The invention relates to the field of refractory materials and especially relates to a method for producing export magnesium-rich olivine sand with MgO content less than 70%. The method comprises carrying out light roasting on magnesite flotation tailings or magnesia shaft furnace dedusting powder, carrying out chemical analysis on a SiO2-containing additive with weight of Y, fully mixing the light roasted powder and the SiO2-containing additive to obtain a uniform mixture, adding water into the mixture, wherein the weight of the used water is 3-5% the total weight of the mixture, carrying out uniform blending, carrying out ball pressing, carrying out natural drying for 2-4 days, carrying out calcination in an oxidation atmosphere at a temperature of 1650+/-50 DEG C, and carrying out thermal insulation for 5-10h to obtain the magnesium-rich olivine sand with MgO content less than 70wt% and refractoriness greater than 1800 DEG C. The magnesium-rich olivine sand comprises forsterite as a principal crystalline phase and periclase as a second crystalline phase. The method prepares the magnesium-rich olivine sand with MgO content less than 70% from magnesite flotation tailings and magnesia shaft furnace dedusting powder, reduces pollution and improves benefits.
Description
Technical field
The present invention relates to fire resisting material field, particularly relate to a kind of method of producing the rich forsterite sand of outlet MgO<70wt%.
Background technology
Magnesia export customs specifies: the magnesia of MgO<70wt% can exempt outward 390 yuan/ton.And after at present China's magnesite exploitation, through the magnesia that calcining is produced, general MgO Han Liang≤70wt%, even if three, level Four mineral resources is also like this, this export to magnesia manufacturing enterprise bring predicament.
The mine tailing of magnesite flotation is: after magnesite exploitation, and through broken grinding and processing, what obtain after carrying out flotation is impure higher, particularly containing the mineral that silicon-dioxide is higher, is generally thrown away as refuse by this kind of mine tailing.
Magnesia shaft furnace dust-removing powder is: after the exploitation of magnesite stone ore, calcine in smoke evacuation process in shaft furnace, dust contained in fume exhaust system, being generally deposited in need not around factory.
Along with the development of industry, the mine tailing of above-mentioned magnesite flotation, the quantity of magnesia shaft furnace dust-removing powder get more and more, and current processing mode is mainly stacking, and not only a large amount of land occupation, and above-mentioned substance is also easy to swim in the air, causes dust pollution.
How effectively to utilize above-mentioned two kinds of industry byproducts, cleaner production, turn waste into wealth, the rich forsterite refractory that production metallurgy building materials industry is badly in need of, meets the export requirement of MgO<70wt% simultaneously, foreign exchange earning is the important topic that enterprise is badly in need of solving.
Summary of the invention
The object of the present invention is to provide a kind of method of producing outlet content of MgO and being less than the rich forsterite sand of 70wt%, wagnerite flotation tailings and magnesia shaft furnace dust-removing powder is utilized to produce the rich forsterite sand of MgO<70wt%, with decreasing pollution, improve effects.
Technical scheme of the present invention is:
Produce the method that outlet content of MgO is less than 70% rich forsterite sand, detailed process is as follows:
(1) carry out light-burned to wagnerite flotation tailings or magnesia shaft furnace dust-removing powder: temperature 850 DEG C ± 50 DEG C, time 5 ~ 10h; Gained light burnt powder weight is X, and carrying out chemical analysis acquisition MgO weight content to light burnt powder is a%;
(2) to containing SiO
2weight of additive be that Y carries out chemical analysis, obtain MgO weight content b%;
(3) containing SiO
2additive and wagnerite flotation tailings or the ratio of light burnt powder weight of magnesia shaft furnace dust-removing powder be:
Y/X＝(70-a)/(b-70)；
(4) raw material is taken according to the above ratio, by light burnt powder and containing SiO
2additive two kinds of raw materials fully mix, the water of additional described mixing raw material gross weight 3 ~ 5%, evenly mixing again, pressure ball, seasoning 2 ~ 4 days, calcines: temperature 1650 DEG C ± 50 DEG C, soaking time 5 ~ 10h under oxidizing atmosphere, obtain the rich forsterite sand of MgO<70wt%, refractoriness >1800 DEG C, rich forsterite sand take forsterite as principal crystalline phase, be the second crystalline phase with periclasite.
Described production outlet content of MgO is less than the method for 70% rich forsterite sand, containing SiO
2additive be the quartz sand of particle diameter≤0.088mm, silica, silicon ash one or more, SiO
2content be>=96wt%.
Described production outlet content of MgO is less than the method for 70% rich forsterite sand, and preferably, the refractoriness of rich forsterite sand is 1801 DEG C ~ 2300 DEG C.Preferred, the refractoriness of rich forsterite sand is 2100 DEG C ~ 2250 DEG C.
Described production outlet content of MgO is less than the method for 70% rich forsterite sand, preferably, the principal crystalline phase forsterite content 45 ~ 60wt% of rich forsterite sand, second crystalline phase periclasite content 35 ~ 50wt% of rich forsterite sand, forsterite and periclasite sum account for 80 ~ 95wt% of total ore weight.Preferred, forsterite and periclasite sum account for 83 ~ 94wt% of total ore weight.
Design philosophy of the present invention is:
The light burnt powder that the present invention adopts magnesite flotation tailings or magnesia shaft furnace dust-removing powder to obtain, containing SiO
2additive, contained MgO and SiO
2hanker reaction and generate forsterite (Mg adding
2siO
4) principal crystalline phase.Due to the CaO/SiO of raw material used herein (wagnerite flotation tailings or magnesia shaft furnace dust-removing powder)
2weight ratio, much smaller than 1, causes the R in system
2o
3compound (as: Al
2o
3, Fe
2o
3deng) being combined into spinel mineral with MgO, unnecessary MgO is present in product with periclasite becomes the second crystalline phase.Due to MgO-2MgO.SiO
2binary eutectic point is 1860 DEG C.Therefore, this product content of MgO is less than 70wt%, has higher thermal structure intensity, is a kind of basic refractory of excellence.
Advantage of the present invention and beneficial effect are:
1, wagnerite flotation tailings and magnesia shaft furnace dust-removing powder are used for making rich forsterite refractory by the present invention, properly process above-mentioned pollutent, utilization of waste material, decrease above-mentioned two kinds of industrial wastes to the pollution of environment.
2, the present invention uses industrial waste to make rich forsterite refractory, significantly reduces the production cost of forsterite refractory; Further, meet the requirement of free export, earn foreign exchange for enterprise and national export and win larger benefit.
Embodiment
In a specific embodiment, the present invention produces the method that outlet content of MgO is less than the rich forsterite sand of 70wt%, mainly comprise two main points: one is that content of MgO is less than 70wt%, two is these materials be take forsterite as principal crystalline phase, take periclasite as the high-quality basic refractory of the second crystalline phase, detailed process is as follows:
(1) carry out light-burned (temperature 850 DEG C ± 50 DEG C, time 5 ~ 10h) wagnerite flotation tailings or magnesia shaft furnace dust-removing powder, gained light burnt powder weight is X, and carrying out chemical analysis acquisition MgO weight content to light burnt powder is a%;
(2) to containing SiO
2additive (weight is Y) carry out chemical analysis, obtain MgO weight content b%;
(3) containing SiO
2additive and wagnerite flotation tailings or the ratio of light burnt powder weight of magnesia shaft furnace dust-removing powder be:
Y/X＝(70-a)/(b-70)；
This batching relation equation derives to calculate under the final condition such as consider to use the composition of raw material, the mineral composition of forsterite, products export to require, use raw material different although use this equation to prepare burden, but the product obtained has stable high-temperature performance, method is quick, accurate.
(4) raw material is taken according to the above ratio, by light burnt powder and containing SiO
2additive two kinds of raw materials fully mix, the water of additional described mixing raw material gross weight 3 ~ 5%, evenly mixing again, pressure ball, seasoning 2 ~ 4 days, under oxidizing atmosphere, calcine (temperature 1650 DEG C ± 50 DEG C, soaking time 5 ~ 10h), the rich forsterite sand of MgO<70wt%, refractoriness >1800 DEG C can be obtained.
Wherein, containing SiO
2additive be the quartz sand of particle diameter≤0.088mm, silica, silicon ash one or more, SiO
2content be>=96wt%, containing SiO
2the more the better.
The invention process step main points are: undertaken light-burned by wagnerite flotation tailings or magnesia shaft furnace dust-removing powder, carry out chemical analysis to light burnt powder; To the SiO selected
2additive also carries out chemical analysis.Mathematical computations is carried out according to the requirement of above-mentioned two chemical analysis results, free export magnesia MgO<70wt% and magnesite refractory balance mineral facies theory, find out the relation equation that various raw material carries out preparing burden, carry out batching actually operating according to relation equation.
Below by embodiment, the present invention is elaborated further.
Embodiment 1
Get particle diameter≤0.088mm wagnerite flotation tailings light burnt powder (X) 2000 kilograms, chemical analysis is done in sampling, and it the results are shown in table 1; Get particle diameter≤0.088mm ground silica (Y) 300 kilograms, chemical analysis is done in sampling, and it the results are shown in table 1:
Table 1
Raw material weight proportioning:
Ground silica (Y)/wagnerite flotation tailings light burnt powder (X)=(70-a)/(b-70)=(70-87.12)/(0.84-70)=0.25=1/4.
Take ground silica 250 kilograms, take wagnerite flotation tailings light burnt powder 250 × 4=1000 kilogram, above-mentioned two kinds of raw materials are put into mixing roll and are fully mixed, the water of additional described mixing raw material gross weight 4%, pressure ball, seasoning 3 days, calcines (temperature 1650 DEG C in oxidizing atmosphere, time 6h), kiln discharge can obtain the rich forsterite sand of MgO<70wt%, refractoriness >1800 DEG C.
In the present embodiment, the content of MgO of rich forsterite sand is 69.70wt%, refractoriness 2193 DEG C.Principal crystalline phase forsterite content 58.7wt%, the second crystalline phase periclasite content 35.2wt%, above-mentioned two high temperature mineral sums account for the 93.9wt% of the total ore weight of product, and therefore the high-temperature behavior such as product refractoriness is excellent.
Embodiment 2
Get particle diameter≤0.088mm magnesia shaft furnace dust-removing powder light burnt powder (X) 3000 kilograms, chemical analysis is done in sampling, and it the results are shown in table 1; Get particle diameter≤0.088mm quartz sand powder (Y) 400 kilograms, chemical analysis is done in sampling, and it the results are shown in table 2:
Table 2
Raw material weight proportioning:
Quartz sand powder (Y)/magnesia shaft furnace is except magnesia shaft furnace dust-removing powder light burnt powder (X)=(70-a)/(b-70)=(70-92.17)/(0.62-70)=22.17/69.38=1/3.13;
Take quartz sand powder 300 kilograms, take magnesia shaft furnace dust-removing powder light burnt powder 300 × 3.13=939 kilogram, above-mentioned two kinds of raw materials are put into mixing roll and are fully mixed, the water of additional described mixing raw material gross weight 4%, pressure ball, seasoning 3 days, (temperature 1650 DEG C is calcined in oxidizing atmosphere, time 6h), kiln discharge can obtain MgO<70wt%, the rich forsterite sand of refractoriness >1800 DEG C.
In the present embodiment, the content of MgO of rich forsterite sand is 69.85wt%, refractoriness 2204 DEG C.Principal crystalline phase forsterite content 56.2wt%, the second crystalline phase periclasite content 36.7wt%, above-mentioned two high temperature mineral sums account for the 92.9wt% of the total ore weight of product, and therefore the high-temperature behavior such as product refractoriness is excellent.
Embodiment 3
Get particle diameter≤0.088mm wagnerite flotation tailings light burnt powder (X) 2500 kilograms, chemical analysis is done in sampling, and it the results are shown in table 3; Get particle diameter≤0.088mm quartz sand powder (Y) 300 kilograms, chemical analysis is done in sampling, and it the results are shown in table 3:
Table 3
Raw material weight proportioning:
Quartz sand powder (Y)/wagnerite flotation tailings light burnt powder (X)=(70-a)/(b-70)=(70-80.33)/(0.73-70)=10.33/69.27=1/6.71;
Take quartz sand powder 200 kilograms, take wagnerite flotation tailings light burnt powder 200 × 6.71=1342 kilogram, above-mentioned two kinds of raw materials are put into mixing roll and are fully mixed, the water of additional described mixing raw material gross weight 4%, pressure ball, seasoning 3 days, (temperature 1650 DEG C is calcined in oxidizing atmosphere, time 6h), kiln discharge can obtain MgO<70wt%, the rich forsterite sand of refractoriness >1800 DEG C.
In the present embodiment, the content of MgO of rich forsterite sand is 69.9wt%, refractoriness 2229 DEG C.Principal crystalline phase forsterite content is 47.5wt%, and the second crystalline phase periclasite content is 40.0wt%, and above-mentioned two high temperature mineral sums account for the 87.5wt% of the total ore weight of product, and therefore the high-temperature behavior such as product refractoriness is excellent.
Above-described embodiment is only be described the preferred embodiment of the present invention; not scope of the present invention is limited; under not departing from the present invention and designing the prerequisite of spirit; the various distortion that those of ordinary skill in the art make technical scheme of the present invention and improvement, all should fall in protection domain that claims of the present invention determines.
Claims (6)
1. produce the method that outlet content of MgO is less than 70% rich forsterite sand, it is characterized in that, detailed process is as follows:
(1) carry out light-burned to wagnerite flotation tailings or magnesia shaft furnace dust-removing powder: temperature 850 DEG C ± 50 DEG C, time 5 ~ 10h; Gained light burnt powder weight is X, and carrying out chemical analysis acquisition MgO weight content to light burnt powder is a%;
(2) to containing SiO
2weight of additive be that Y carries out chemical analysis, obtain MgO weight content b%;
(3) containing SiO
2additive and wagnerite flotation tailings or the ratio of light burnt powder weight of magnesia shaft furnace dust-removing powder be:
Y/X＝(70-a)/(b-70)；
(4) raw material is taken according to the above ratio, by light burnt powder and containing SiO
2additive two kinds of raw materials fully mix, the water of additional described mixing raw material gross weight 3 ~ 5%, evenly mixing again, pressure ball, seasoning 2 ~ 4 days, calcines: temperature 1650 DEG C ± 50 DEG C, soaking time 5 ~ 10h under oxidizing atmosphere, obtain the rich forsterite sand of MgO<70wt%, refractoriness >1800 DEG C, rich forsterite sand take forsterite as principal crystalline phase, be the second crystalline phase with periclasite.
2., according to the method for producing outlet content of MgO and being less than 70% rich forsterite sand according to claim 1, it is characterized in that, containing SiO
2additive be the quartz sand of particle diameter≤0.088mm, silica, silicon ash one or more, SiO
2content be>=96wt%.
3., according to the method for producing outlet content of MgO and being less than 70% rich forsterite sand according to claim 1, it is characterized in that, preferably, the refractoriness of rich forsterite sand is 1801 DEG C ~ 2300 DEG C.
4. be less than the method for 70% rich forsterite sand according to the production outlet content of MgO described in claim 1 or 3, it is characterized in that, preferably, the refractoriness of rich forsterite sand is 2100 DEG C ~ 2250 DEG C.
5. according to the method for producing outlet content of MgO and being less than 70% rich forsterite sand according to claim 1, it is characterized in that, preferably, the principal crystalline phase forsterite content 45 ~ 60wt% of rich forsterite sand, second crystalline phase periclasite content 35 ~ 50wt% of rich forsterite sand, forsterite and periclasite sum account for 80 ~ 95wt% of total ore weight.
6., according to the method for producing outlet content of MgO and being less than 70% rich forsterite sand according to claim 5, it is characterized in that, preferably, forsterite and periclasite sum account for 83 ~ 94wt% of total ore weight.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107954729A (en) * | 2017-11-22 | 2018-04-24 | 海城市中兴镁质合成材料有限公司 | One kind synthesis reheating magnesia and preparation method thereof |
| CN111017941A (en) * | 2020-01-16 | 2020-04-17 | 海城市中昊镁业有限公司 | Method for preparing sintered forsterite by re-sintering magnesite tailings |
| CN112250435A (en) * | 2020-10-22 | 2021-01-22 | 彰武县联信铸造硅砂有限公司 | Forsterite spherical sand and preparation method and application thereof |
| CN115231580A (en) * | 2022-07-19 | 2022-10-25 | 沈阳化工大学 | Method for preparing forsterite and magnesite by sintering fine granular magnesite flotation tailings |
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| CN1686894A (en) * | 2005-06-03 | 2005-10-26 | 海城华宇集团 | Method for preparing magnesia by using dust removal powder of magnesia for shaft kiln and kibble powder of disused magnesite ore |
| CN102295293A (en) * | 2011-06-14 | 2011-12-28 | 辽宁科技大学 | Method for synthesizing high purity forsterite with mine tailings of magnesite and talcum |
| CN102942370A (en) * | 2012-11-16 | 2013-02-27 | 大石桥市中建镁砖有限公司 | Artificial forsterite sand and application thereof |
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2015
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1686894A (en) * | 2005-06-03 | 2005-10-26 | 海城华宇集团 | Method for preparing magnesia by using dust removal powder of magnesia for shaft kiln and kibble powder of disused magnesite ore |
| CN102295293A (en) * | 2011-06-14 | 2011-12-28 | 辽宁科技大学 | Method for synthesizing high purity forsterite with mine tailings of magnesite and talcum |
| CN102942370A (en) * | 2012-11-16 | 2013-02-27 | 大石桥市中建镁砖有限公司 | Artificial forsterite sand and application thereof |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107954729A (en) * | 2017-11-22 | 2018-04-24 | 海城市中兴镁质合成材料有限公司 | One kind synthesis reheating magnesia and preparation method thereof |
| CN107954729B (en) * | 2017-11-22 | 2021-08-03 | 辽宁利尔镁质合成材料股份有限公司 | Synthetic dead-burned magnesia and preparation method thereof |
| CN111017941A (en) * | 2020-01-16 | 2020-04-17 | 海城市中昊镁业有限公司 | Method for preparing sintered forsterite by re-sintering magnesite tailings |
| CN112250435A (en) * | 2020-10-22 | 2021-01-22 | 彰武县联信铸造硅砂有限公司 | Forsterite spherical sand and preparation method and application thereof |
| CN115231580A (en) * | 2022-07-19 | 2022-10-25 | 沈阳化工大学 | Method for preparing forsterite and magnesite by sintering fine granular magnesite flotation tailings |
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