CN104961473B - A kind of method for producing outlet content of MgO rich forsterite sand less than 70% - Google Patents

A kind of method for producing outlet content of MgO rich forsterite sand less than 70% Download PDF

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CN104961473B
CN104961473B CN201510297623.4A CN201510297623A CN104961473B CN 104961473 B CN104961473 B CN 104961473B CN 201510297623 A CN201510297623 A CN 201510297623A CN 104961473 B CN104961473 B CN 104961473B
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mgo
forsterite
rich
content
sand
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CN104961473A (en
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李广达
张永禄
周斌
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HAICHENG HUAYU REFRACTORY MATERIAL CO Ltd
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HAICHENG HUAYU REFRACTORY MATERIAL CO Ltd
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Abstract

A kind of the present invention relates to fire resisting material field, more particularly to production outlet MgO<The method of 70wt% richness forsterite sands.First, magnesite flotation tailing or magnesia shaft furnace dust-removing powder are carried out light-burned;Then, to containing SiO2Weight of additive carry out chemical analyses for Y;By light burnt powder and containing SiO2Two kinds of raw materials of additive be sufficiently mixed uniformly, the water of the additional mixed material gross weight 3~5%, then knead uniform, pressure ball is spontaneously dried 2~4 days, is calcined under oxidizing atmosphere:1650 DEG C ± 50 DEG C of temperature, 5~10h of temperature retention time obtain MgO<70wt%, refractoriness>1800 DEG C of rich forsterite sand, rich forsterite sand is with forsterite as principal crystalline phase, with periclase as the second crystalline phase.The present invention is using magnesite flotation tailing and magnesia shaft furnace dust-removing powder production MgO<70wt% richness forsterite sands, to reduce pollution, increase benefit.

Description

A kind of method for producing outlet content of MgO rich forsterite sand less than 70%
Technical field
A kind of the present invention relates to fire resisting material field, more particularly to production outlet MgO<The side of 70wt% richness forsterite sands Method.
Background technology
Magnesia export customs specify:MgO<The magnesia of 70wt% can exempt 390 yuan/ton of export duty.And current China magnesite Ore deposit exploitation after, through calcining production magnesia, general content of MgO 70wt%, even three, level Four mineral resources be also thus, this will Predicament is brought to the outlet of magnesia manufacturing enterprise.
The mine tailing of magnesite flotation is:After magnesite exploitation, process through crushing, obtained after carrying out flotation is impure Higher, particularly containing the mineral that silicon dioxide is higher, typically this kind of mine tailing is thrown away as waste.
Magnesia shaft furnace dust-removing powder is:After the exploitation of magnesite stone ore, in shaft furnace during calcining smoke evacuation, institute in smoke evacuation system The dust for containing, be typically deposited in around factory without.
With industry continuous development, the mine tailing of above-mentioned magnesite flotation, magnesia shaft furnace dust-removing powder quantity more and more, Current processing mode is predominantly stacked, not only a large amount of land occupations, and above-mentioned substance is also easy to floating in the air, causes Dust pollution.
How effectively utilizes above two industry byproduct, clean manufacturing, turns waste into wealth, and production metallurgy building materials industry is badly in need of Rich forsterite refractory, while meeting MgO<The export requirement of 70wt%, foreign exchange earning is the weight of enterprise's urgent need solution Want problem.
Content of the invention
It is an object of the invention to provide a kind of method for producing outlet content of MgO less than 70wt% richness forsterite sands, Using magnesite flotation tailing and magnesia shaft furnace dust-removing powder production MgO<70wt% richness forsterite sands, to reduce pollution, increase Benefit.
The technical scheme is that:
A kind of method for producing outlet content of MgO rich forsterite sand less than 70%, detailed process are as follows:
(1) magnesite flotation tailing or magnesia shaft furnace dust-removing powder are carried out light-burned:850 DEG C ± 50 DEG C of temperature, time 5~ 10h;Gained light burnt powder weight is X, and it is a% to carry out chemical analyses to light burnt powder and obtain MgO weight contents;
(2) to containing SiO2Weight of additive carry out chemical analyses for Y, obtain MgO weight content b%;
(3) contain SiO2Additive with the light burnt powder weight ratio of magnesite flotation tailing or magnesia shaft furnace dust-removing powder be:
Y/X=(70-a)/(b-70);
(4) raw material is weighed according to the above ratio, by light burnt powder and containing SiO2Two kinds of raw materials of additive be sufficiently mixed uniformly, outward Plus the water of the mixed material gross weight 3~5%, then uniform, pressure ball is kneaded, spontaneously dry 2~4 days, forge under oxidizing atmosphere Burn:1650 DEG C ± 50 DEG C of temperature, 5~10h of temperature retention time obtain MgO<70wt%, refractoriness>1800 DEG C of rich forsterite Sand, rich forsterite sand is with forsterite as principal crystalline phase, with periclase as the second crystalline phase.
The method of described production outlet content of MgO rich forsterite sand less than 70%, containing SiO2Additive be particle diameter The quartz sand of≤0.088mm, Silicon stone, silicon ash one or more, SiO2Content be >=96wt%.
The method of described production outlet content of MgO rich forsterite sand less than 70%, it is preferred that rich forsterite sand Refractoriness is 1801 DEG C~2300 DEG C.It is furthermore preferred that the refractoriness of rich forsterite sand is 2100 DEG C~2250 DEG C.
The method of described production outlet content of MgO rich forsterite sand less than 70%, it is preferred that rich forsterite sand Principal crystalline phase forsterite 45~60wt% of content, second crystalline phase periclase 35~50wt% of content of rich forsterite sand, magnesium olive Olive stone and periclase sum account for 80~95wt% of total ore weight.It is furthermore preferred that forsterite and periclase sum account for Zong Kuang 83~94wt% of thing weight.
The present invention design philosophy be:
The present invention is using the light burnt powder of magnesite flotation tailing or the acquisition of magnesia shaft furnace dust-removing powder, containing SiO2Additive, Contained MgO and SiO2In heating, reaction generates forsterite (Mg2SiO4) principal crystalline phase.Due to raw material (magnesite used herein Stone flotation tailing or magnesia shaft furnace dust-removing powder) CaO/SiO2Weight ratio causes the R in system much smaller than 12O3Compound is (such as: Al2O3、Fe2O3Deng) spinelle mineral are combined into MgO, unnecessary MgO is present in product with periclase becomes the second crystalline phase. Due to MgO-2MgO.SiO2Binary eutectic point is 1860 DEG C.Therefore, the product content of MgO is less than 70wt%, with higher Thermal structure intensity, is a kind of excellent basic refractory.
Advantages of the present invention and have the beneficial effect that:
1st, magnesite flotation tailing and magnesia shaft furnace dust-removing powder are used for making rich forsterite refractory by the present invention, appropriate It is apt to process above-mentioned pollutant, twice laid reduces pollution of the above two industrial waste to environment.
2nd, the present invention makes rich forsterite refractory using industrial waste, significantly reduces forsterite fire proofed wood The production cost of material;Also, the requirement of free export is met, is that enterprise and national export are earned foreign exchange and win larger benefit.
Specific embodiment
In a specific embodiment, method of the present invention production outlet content of MgO less than 70wt% richness forsterite sands, main To include two main points:One is content of MgO less than 70wt%, two be the material be with forsterite as principal crystalline phase, with periclase For the high-quality basic refractory of the second crystalline phase, detailed process is as follows:
(1) magnesite flotation tailing or magnesia shaft furnace dust-removing powder are carried out light-burned (850 DEG C ± 50 DEG C of temperature, time 5~ 10h), gained light burnt powder weight is X, and it is a% to carry out chemical analyses to light burnt powder and obtain MgO weight contents;
(2) to containing SiO2Additive (weight is Y) carry out chemical analyses, obtain MgO weight content b%;
(3) contain SiO2Additive with the light burnt powder weight ratio of magnesite flotation tailing or magnesia shaft furnace dust-removing powder be:
Y/X=(70-a)/(b-70);
The dispensing relation equation is to consider the composition using raw material, the mineral composition of forsterite, products export requirement Calculate Deng deriving under the conditions of border, although different using raw material using equation dispensing, the product for obtaining is high temperatures Can be stable, method is quick, accurate.
(4) raw material is weighed according to the above ratio, by light burnt powder and containing SiO2Two kinds of raw materials of additive be sufficiently mixed uniformly, outward Plus the water of the mixed material gross weight 3~5%, then uniform, pressure ball is kneaded, spontaneously dry 2~4 days, forge under oxidizing atmosphere Burn (1650 DEG C ± 50 DEG C of temperature, 5~10h of temperature retention time), MgO can be obtained<70wt%, refractoriness>1800 DEG C of rich magnesium Fructus Canarii albi Stone sand.
Wherein, containing SiO2Additive be the quartz sand of particle diameter≤0.088mm, Silicon stone, silicon ash one or more, SiO2Content be >=96wt%, containing SiO2The more the better.
Implementation steps main points of the present invention are:Magnesite flotation tailing or magnesia shaft furnace dust-removing powder are carried out light-burned, to light-burned Powder carries out chemical analyses;To the SiO for selecting2Additive is also carried out chemical analyses.According to above-mentioned two chemical analysis results, outlet Tax-free magnesia MgO<The requirement of 70wt% and magnesia refractories balance mineral facies theory carry out mathematical calculation, find out various raw materials The relation equation of dispensing is carried out, dispensing practical operation is carried out according to relation equation.
The present invention is further elaborated on below by embodiment.
Embodiment 1
Particle diameter≤2000 kilograms of 0.088mm magnesites flotation tailing light burnt powder (X) is taken, chemical analyses are done in sampling, its result It is listed in Table 1;Particle diameter≤300 kilograms of 0.088mm Cab-O-sils (Y) are taken, chemical analyses are done in sampling, and its result is listed in Table 1:
Table 1
Raw material weight proportioning of soup processed:
Cab-O-sil (Y)/magnesite flotation tailing light burnt powder (X)=(70-a)/(b-70)=(70-87.12)/(0.84- 70)=0.25=1/4.
250 kilograms of Cab-O-sil is weighed, 250 × 4=1000 kilogram of magnesite flotation tailing light burnt powder is weighed, above two is former Material is put in kneading machine and is sufficiently mixed uniform, the water of the additional mixed material gross weight 4%, and pressure ball is spontaneously dried 3 days, (1650 DEG C of temperature, time 6h) is calcined in oxidizing atmosphere, kiln discharge can obtain MgO<70wt%, refractoriness>1800 DEG C of rich magnesium Olivine sand.
In the present embodiment, the content of MgO of rich forsterite sand is 69.70wt%, 2193 DEG C of refractoriness.Principal crystalline phase magnesium Fructus Canarii albi Stone content 58.7wt%, the second crystalline phase periclase content 35.2wt%, above-mentioned two high temperature minerals sum account for the total ore weight of product 93.9wt%, therefore the high-temperature behavior such as product refractoriness is excellent.
Embodiment 2
Particle diameter≤3000 kilograms of 0.088mm magnesia shaft furnace dust-removing powder light burnt powder (X) is taken, chemical analyses are done in sampling, its result It is listed in Table 1;Particle diameter≤400 kilograms of 0.088mm quartz sand powders (Y) are taken, chemical analyses are done in sampling, and its result is listed in Table 2:
Table 2
Raw material weight proportioning of soup processed:
Quartz sand powder (Y)/magnesia shaft furnace removes 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;
300 kilograms of quartz sand powder is weighed, 300 × 3.13=939 kilogram of magnesia shaft furnace dust-removing powder light burnt powder is weighed, above-mentioned two Kind raw material is put in kneading machine and is sufficiently mixed uniform, the water of the additional mixed material gross weight 4%, and pressure ball spontaneously dries 3 My god, (1650 DEG C of temperature, time 6h) is calcined in oxidizing atmosphere, kiln discharge can obtain MgO<70wt%, refractoriness>1800 DEG C Rich forsterite sand.
In the present embodiment, the content of MgO of rich forsterite sand is 69.85wt%, 2204 DEG C of refractoriness.Principal crystalline phase magnesium Fructus Canarii albi Stone content 56.2wt%, the second crystalline phase periclase content 36.7wt%, above-mentioned two high temperature minerals sum account for the total ore weight of product 92.9wt%, therefore the high-temperature behavior such as product refractoriness is excellent.
Embodiment 3
Particle diameter≤2500 kilograms of 0.088mm magnesites flotation tailing light burnt powder (X) is taken, chemical analyses are done in sampling, its result It is listed in Table 3;Particle diameter≤300 kilograms of 0.088mm quartz sand powders (Y) are taken, chemical analyses are done in sampling, and its result is listed in Table 3:
Table 3
Raw material weight proportioning of soup processed:
Quartz sand powder (Y)/magnesite flotation tailing light burnt powder (X)=(70-a)/(b-70)=(70-80.33)/(0.73- 70)=10.33/69.27=1/6.71;
200 kilograms of quartz sand powder is weighed, 200 × 6.71=1342 kilogram of magnesite flotation tailing light burnt powder is weighed, above-mentioned Two kinds of raw materials are put in kneading machine and are sufficiently mixed uniform, the water of the additional mixed material gross weight 4%, and pressure ball spontaneously dries 3 My god, (1650 DEG C of temperature, time 6h) is calcined in oxidizing atmosphere, kiln discharge can obtain MgO<70wt%, refractoriness>1800 DEG C Rich forsterite sand.
In the present embodiment, the content of MgO of rich forsterite sand is 69.9wt%, 2229 DEG C of refractoriness.Principal crystalline phase magnesium Fructus Canarii albi Stone content is 47.5wt%, and the second crystalline phase periclase content is 40.0wt%, and above-mentioned two high temperature minerals sum accounts for the total mineral of product The 87.5wt% of weight, therefore the high-temperature behavior such as product refractoriness is excellent.
Embodiment described above is only that the preferred embodiment of the present invention is described, not the model to the present invention Enclose and be defined, on the premise of without departing from design spirit of the present invention, technical side of the those of ordinary skill in the art to the present invention Various modifications and improvement that case is made, all should fall in the protection domain of claims of the present invention determination.

Claims (6)

1. a kind of method for producing outlet content of MgO less than 70% rich forsterite sand, it is characterised in that detailed process is as follows:
(1)Magnesite flotation tailing or magnesia shaft furnace dust-removing powder are carried out light-burned:850 DEG C ± 50 DEG C of temperature, time 5~10;Institute It is X to obtain light burnt powder weight, and it is a% to carry out chemical analyses to light burnt powder and obtain MgO weight contents;
(2)To containing SiO2Weight of additive carry out chemical analyses for Y, obtain MgO weight content b%;
(3)Contain SiO2Additive with the light burnt powder weight ratio of magnesite flotation tailing or magnesia shaft furnace dust-removing powder be:
Y/X=(70-a)/(b-70);
(4)Raw material is weighed according to the above ratio, by light burnt powder and containing SiO2Two kinds of raw materials of additive be sufficiently mixed uniformly, additional institute The water of mixed material gross weight 3~5% is stated, then kneads uniform, pressure ball, spontaneously dried 2~4 days, calcine under oxidizing atmosphere:Temperature 1650 DEG C ± 50 DEG C of degree, temperature retention time 5~10, due to MgO-2MgO.SiO2Binary eutectic point is 1860 DEG C, obtains MgO< 70 wt%, refractoriness>1800 DEG C of rich forsterite sand, rich forsterite sand with forsterite as principal crystalline phase, with periclase is Second crystalline phase.
2. according to the method for the production outlet content of MgO rich forsterite sand less than 70% described in claim 1, it is characterised in that Contain SiO2Additive be the quartz sand of particle diameter≤0.088mm, Silicon stone, silicon ash one or more, SiO2Content for >= 96 wt%.
3. according to the method for the production outlet content of MgO rich forsterite sand less than 70% described in claim 1, it is characterised in that Preferably, the refractoriness of rich forsterite sand is 1801 DEG C~2300 DEG C.
4., according to the method for the production outlet content of MgO rich forsterite sand less than 70% described in claim 1 or 3, its feature exists In, it is preferred that the refractoriness of rich forsterite sand is 2100 DEG C~2250 DEG C.
5. according to the method for the production outlet content of MgO rich forsterite sand less than 70% described in claim 1, it is characterised in that Preferably, 45~60 wt% of principal crystalline phase forsterite content of rich forsterite sand, second crystalline phase side's magnesium of rich forsterite sand 35~50 wt% of stone content, forsterite and periclase sum account for 80~95 wt% of total ore weight.
6. according to the method for the production outlet content of MgO rich forsterite sand less than 70% described in claim 5, it is characterised in that Preferably, forsterite and periclase sum account for 83~94 wt% of total ore weight.
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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

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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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CN1325418C (en) * 2005-06-03 2007-07-11 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

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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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