CN111017941A - Method for preparing sintered forsterite by re-sintering magnesite tailings - Google Patents
Method for preparing sintered forsterite by re-sintering magnesite tailings Download PDFInfo
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- CN111017941A CN111017941A CN202010045535.6A CN202010045535A CN111017941A CN 111017941 A CN111017941 A CN 111017941A CN 202010045535 A CN202010045535 A CN 202010045535A CN 111017941 A CN111017941 A CN 111017941A
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- forsterite
- magnesite
- tailings
- magnesite tailings
- anthracite
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
- C01B33/00—Silicon; Compounds thereof
- C01B33/20—Silicates
- C01B33/22—Magnesium silicates
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
- C01P2006/00—Physical properties of inorganic compounds
- C01P2006/10—Solid density
Abstract
The invention relates to a method for preparing sintered forsterite by re-sintering magnesite tailings, belonging to the fields of comprehensive utilization of magnesite and calcination of refractory materials. The sintered magnesite is prepared by taking magnesite tailings, silica fine powder and anthracite as raw materials and an external binding agent according to a certain proportion through the steps of proportioning, co-grinding, ball pressing, drying and sintering. Compared with the prior art, the method has the beneficial effects that the magnesite tailings are effectively utilized, and the ecological environment problem caused by the accumulation of the magnesite tailings is relieved. The magnesite tailings and the silica fine powder are used as raw materials, the sintered forsterite is produced by a re-sintering method, the enrichment effect of silicon dioxide in magnesite flotation tailings is fully utilized, the iron oxide content of the produced forsterite refractory material is low, and the refractory performance is better than that of natural forsterite.
Description
Technical Field
The invention belongs to the field of comprehensive utilization of magnesite and calcination of refractory materials, and particularly relates to a method for preparing sintered forsterite by re-sintering magnesite tailings.
Background
Forsterite belongs to an orthorhombic system, is a consistent melting binary compound, has stable crystal form, higher refractoriness under load, good thermal shock stability and chemical stability, and is widely applied to the fields of metallurgy, building materials, glass, ceramics and the like. There are also forsterite ores in nature, such as natural magnesite deposits with considerable reserves in the Henan and Hubei provinces of China, and then the iron oxide content of the natural forsterite ores is high, so that the application range of the natural forsterite ores is limited, and therefore, the research on industrial synthesis of forsterite becomes one of the hot spots in the industry.
At present, the industrial forsterite synthesis method mainly comprises a calcination method and an electric melting method, wherein the volume density of a sample prepared by the calcination method is 3.08 g/cm3The porosity is 7.8%, the content of iron oxide is 1.1%, and the refractoriness is more than 1650 ℃. The bulk density of the sample obtained by the electric melting method was 3.11 g/cm3The porosity is 6.4%, the content of ferric oxide is 0.8%, and the refractoriness is more than 1650 ℃. The most common, and most mature, is the calcination process. The method takes natural olivine ore or natural magnesite, light-burned magnesia, silicalite ore, serpentine ore, talc ore and the like as raw materials, and the raw materials are produced by utilizing calcining equipment such as a high-temperature vertical kiln, a rotary kiln and the like. In addition, the synthetic forsterite can also be prepared by adopting an electric melting method, however, the electric melting method or the sintering method has the factors of high raw material cost, unstable product quality, complex process, complex operation and the like, so that the price of the synthetic forsterite product is generally higher, and the use of the forsterite in the refractory material industry is greatly limited. Therefore, the search for a preparation method of forsterite with low production cost, high density, high purity and good fire resistance is urgent.
With the increase of the mining strength of magnesite resources, high-quality magnesium resources are continuously reduced, and magnesite generates about 30% of tailings during flotation, so that the tailings are continuously accumulated. The magnesite tailings accumulated in large quantities not only occupy land resources and destroy landform vegetation, but also contain heavy metals of lead and zinc, harmful elements and chemical agents, which can cause pollution to surface water, underground water and atmospheric environment. In addition, the tailings accumulation still has the geological disasters of debris flow, mountain landslide, dam collapse and the like, and threatens the life and property safety of the downstream masses.
Disclosure of Invention
The invention relates to a method for preparing sintered forsterite by re-burning magnesite tailings, which overcomes the defects of the prior art, solves the problems of environmental pollution and resource waste of the magnesite tailings stored in a stacking way, develops a novel method for synthesizing forsterite with low production cost, high density, high purity and good fire resistance, and is beneficial to realizing large-scale production and utilization of the magnesite tailings.
In order to achieve the purpose, the invention is realized by the following technical scheme:
the method for preparing the sintered forsterite by re-sintering the magnesite tailings is characterized in that the raw material of the sintered forsterite consists of the following components in percentage by mass:
60-75% of magnesite tailings with the particle size of 0.074-1 mm
10 to 20% of silica fine powder having a particle size of 0.074 to 1mm
10 to 20 percent of anthracite with the grain diameter of 0.074 to 1mm
The sintered forsterite is prepared by re-sintering magnesite tailings, and the specific operation steps are as follows:
step one, putting the magnesite tailings and the silica fine powder into a tube mill for co-grinding for 20-30 minutes to obtain a co-grinding material;
placing the co-grinding material obtained in the step one and an inorganic bonding agent accounting for 1-5% of the total mass of the raw materials into a stirrer, and mixing for 10-15 minutes at a speed of 300-350 r/min to obtain a mixture;
pressing the mixture into a ball material with the diameter of 10-15 mm by using a ball press machine under the pressure of 2-6 Mpa;
drying the ball material in an environment of 100-120 ℃ for 2-5 hours to obtain a dried ball material;
and fifthly, alternately distributing the dry pellets and anthracite into a shaft kiln at 1400-1800 ℃, calcining for 5-12 hours, naturally cooling along with the kiln, and taking out of the kiln to obtain the re-burned forsterite.
In the step one, the MgO content of the magnesite tailings is more than or equal to 30 percent, and the SiO content is more than or equal to 30 percent2The content is more than or equal to 55 percent; SiO in silica Fine powder2The content is more than or equal to 90 percent;
in the step one, the inorganic binder is Mg (OH)2、MgSO4Or MgCl2Any one of (1) to (2)And (4) seed preparation.
The C content of the anthracite in the fifth step is more than or equal to 80 percent;
and in the fifth step, the dried ball material and the anthracite are distributed in an alternating mode, the thickness of each layer is 110-140 mm, and the thickness of the anthracite is 50-85 mm.
Compared with the prior art, the invention has the beneficial effects that: the magnesite tailings are effectively utilized, and the ecological environment problem caused by the accumulation of the magnesite tailings is relieved; the magnesite tailings and the silica fine powder are used as raw materials, the sintered forsterite is produced by a re-sintering method, the enrichment effect of silicon dioxide in magnesite flotation tailings is fully utilized, the content of iron oxide in the produced forsterite refractory material is as low as 0.57%, compared with natural forsterite, the produced forsterite refractory material has better refractory performance, the refractoriness is improved to be more than 1700 ℃, and the comprehensive performance is excellent.
Drawings
FIG. 1 is a process flow of an embodiment of the present invention.
Detailed Description
The invention is further described below with reference to specific embodiments.
Example 1
Putting 75kg of magnesite tailings and 15kg of silica fine powder and silica fine powder into a tube mill for co-grinding for 20 minutes to obtain a co-grinding material; the coabrasive was mixed with 2kg of Mg (OH)2Putting the mixture into a stirrer together, and mixing for 12 minutes at the speed of 300r/min to obtain a mixture; pressing the mixture into a ball material with the diameter of 10mm by using a ball press machine under 5 Mpa; placing the ball material at 110 ℃, and drying for 3 hours to obtain a dried ball material; the dried pellets and 10kg of anthracite are distributed and calcined in a vertical kiln at 1450 ℃ for 5.5 hours in an alternating mode (the thickness of the dried pellets is 120mm, and the thickness of the anthracite is 75 mm), and the materials are discharged from the kiln after being naturally cooled along with the kiln, so that the dead burned forsterite is obtained.
Measuring the volume density and the porosity of the sample according to GB/T2997-2000; measuring the content of iron oxide in the sample according to GB/T21114-2017; the refractoriness of the sample is measured according to GB/T7322-2007. The volume density of the dead-burned forsterite prepared in this example was 3.30g/cm3The porosity is 5.1%, the content of ferric oxide is 0.7%, and the refractoriness is more than 1700 ℃.
Example 2
Putting 75kg of magnesite tailings and 15kg of silica fine powder and silica fine powder into a tube mill for co-grinding for 25 minutes to obtain a co-grinding material; the co-grinding material was mixed with 2kg of MgSO4Putting the mixture into a stirrer together, and mixing for 15 minutes at the speed of 300r/min to obtain a mixture; pressing the mixture into a ball material with the diameter of 10mm by using a ball press machine under 5 Mpa; placing the ball material at 110 ℃, and drying for 3 hours to obtain a dried ball material; and (3) distributing the dried pellets and 10kg of anthracite in an alternating mode (the thickness of the dried pellets is 120mm, the thickness of the anthracite is 75 mm) in a 1600 ℃ shaft kiln, calcining for 8 hours, naturally cooling along with the kiln, and taking out of the kiln to obtain the re-burned forsterite.
Measuring the volume density and the porosity of the sample according to GB/T2997-2000; measuring the content of iron oxide in the sample according to GB/T21114-2017; the refractoriness of the sample is measured according to GB/T7322-2007. The dead-burned forsterite prepared in this example had a bulk density of 3.21g/cm3The porosity is 6.0%, the content of ferric oxide is 0.65%, and the refractoriness is more than 1700 ℃.
Example 3
Putting 75kg of magnesite tailings and 15kg of silica fine powder and silica fine powder into a tube mill for co-grinding for 25 minutes to obtain a co-grinding material; the co-abrasives were mixed with 2kg of MgCl2Putting the mixture into a stirrer together, and mixing for 15 minutes at the speed of 300r/min to obtain a mixture; pressing the mixture into a ball material with the diameter of 10mm by using a ball press machine under 5 Mpa; placing the ball material at 110 ℃, and drying for 3 hours to obtain a dried ball material; and (3) distributing the dried pellets and 10kg of anthracite in an alternating mode (the thickness of the dried pellets is 120mm, the thickness of the anthracite is 75 mm) in a vertical kiln at 1650 ℃, calcining for 10 hours, naturally cooling along with the kiln, and taking out of the kiln to obtain the re-fired forsterite.
Measuring the volume density and the porosity of the sample according to GB/T2997-2000; measuring the content of iron oxide in the sample according to GB/T21114-2017; the refractoriness of the sample is measured according to GB/T7322-2007. The dead-burned forsterite prepared in this example had a bulk density of 3.12g/cm3The porosity is 5.3%, the content of ferric oxide is 0.57%, and the refractoriness is more than 1700 ℃.
Example 4
Putting 75kg of magnesite tailings and 15kg of silica fine powder and silica fine powder into a tube mill for co-grinding for 25 minutes to obtain a co-grinding material; the co-abrasives were mixed with 3kg of MgCl2Putting the mixture into a stirrer together, and mixing for 15 minutes at the speed of 300r/min to obtain a mixture; pressing the mixture into a ball material with the diameter of 10mm by using a ball press machine under 5 Mpa; putting the ball material into a drying furnace at 110 ℃, and drying for 3 hours to obtain a dried ball material; and (3) distributing the dried pellets and 10kg of anthracite in an alternating mode (the thickness of the dried pellets is 120mm, the thickness of the anthracite is 75 mm) in a vertical kiln at 1800 ℃, calcining for 9 hours, naturally cooling along with the kiln, and taking out of the kiln to obtain the re-burned forsterite.
Measuring the volume density and the porosity of the sample according to GB/T2997-2000; measuring the content of iron oxide in the sample according to GB/T21114-2017; the refractoriness of the sample is measured according to GB/T7322-2007. The dead-burned forsterite prepared in this example had a bulk density of 3.21g/cm3The porosity is 5.31%, the content of ferric oxide is 0.62%, and the refractoriness is more than 1700 ℃.
Example 5
Putting 75kg of magnesite tailings and 15kg of silica fine powder and silica fine powder into a tube mill for co-grinding for 25 minutes to obtain a co-grinding material; the co-abrasives were mixed with 4kg of MgCl2Putting the mixture into a stirrer together, and mixing for 15 minutes at the speed of 300r/min to obtain a mixture; pressing the mixture into a ball material with the diameter of 10mm by using a ball press machine under 5 Mpa; putting the ball material into a drying furnace at 110 ℃, and drying for 3 hours to obtain a dried ball material; and (3) distributing the dried pellets and 10kg of anthracite in an alternating mode (the thickness of the dried pellets is 120mm, the thickness of the anthracite is 75 mm) in a 1750 ℃ shaft kiln, calcining for 11 hours, naturally cooling along with the kiln, and taking out of the kiln to obtain the re-burned forsterite.
Measuring the volume density and the porosity of the sample according to GB/T2997-2000; measuring the content of iron oxide in the sample according to GB/T21114-2017; the refractoriness of the sample is measured according to GB/T7322-2007. The dead-burned forsterite prepared in this example had a bulk density of 3.17g/cm3The porosity is 5.28%, the content of ferric oxide is 0.54%, and the refractoriness is more than 1700 ℃.
In the above embodiment, the MgO content in the magnesite tailings is not less than 30%, and the SiO content is not less than 30%2The content is more than or equal to 55 percent(ii) a SiO in silica Fine powder2The content is more than or equal to 90 percent. The particle size of the magnesite tailings is 0.074-1 mm, the particle size of the silica fine powder is 0.074-1 mm, and the particle size of the anthracite is 0.074-1 mm. The C content in the anthracite is 82 percent.
Inorganic Binder (Mg (OH) for use in the present invention2、MgSO4Or MgCl2) The fine ore pellets prepared by the inorganic binder have low impurity content after being calcined, and the specific generated gas is determined by the type of the selected inorganic binder and does not introduce other impurities; the gas generated by the inorganic binder in the calcining process is very little, and the influence on the fine ore pellets is hardly caused, so that the compactness of the prepared fine ore pellets after roasting is obviously improved; the inorganic binder selected by the invention is nontoxic and conforms to the environmental protection concept better.
Claims (5)
1. The method for preparing the sintered forsterite by re-sintering the magnesite tailings is characterized in that the raw material of the sintered forsterite consists of the following components in percentage by mass:
60-75% of magnesite tailings with the particle size of 0.074-1 mm
10 to 20% of silica fine powder having a particle size of 0.074 to 1mm
10 to 20 percent of anthracite with the grain diameter of 0.074 to 1mm
The sintered forsterite is prepared by re-sintering magnesite tailings, and the specific operation steps are as follows:
step one, putting the magnesite tailings and the silica fine powder into a tube mill for co-grinding for 20-30 minutes to obtain a co-grinding material;
placing the co-grinding material obtained in the step one and an inorganic bonding agent accounting for 1-5% of the total mass of the raw materials into a stirrer, and mixing for 10-15 minutes at a speed of 300-350 r/min to obtain a mixture;
pressing the mixture into a ball material with the diameter of 10-15 mm by using a ball press machine under the pressure of 2-6 Mpa;
drying the ball material in an environment of 100-120 ℃ for 2-5 hours to obtain a dried ball material;
and fifthly, alternately distributing the dry pellets and anthracite into a shaft kiln at 1400-1800 ℃, calcining for 5-12 hours, naturally cooling along with the kiln, and taking out of the kiln to obtain the re-burned forsterite.
2. The method for preparing sintered forsterite by re-firing magnesite tailings as claimed in claim 1, wherein the magnesite tailings in the first step have a MgO content of not less than 30%, and SiO2The content is more than or equal to 55 percent; SiO in silica Fine powder2The content is more than or equal to 90 percent.
3. The method for preparing the sintered forsterite by the dead burning of the magnesite tailings as claimed in claim 1, wherein the inorganic binder in the second step is Mg (OH)2、MgSO4Or MgCl2Any one of the above.
4. The method for preparing sintered forsterite by re-firing magnesite tailings as claimed in claim 1, wherein the content of C in the anthracite coal in the fifth step is not less than 80%.
5. The method for preparing sintered forsterite by using magnesite tailing reburning as claimed in claim 1, wherein in the fifth step, the dried pellets and anthracite are distributed in an alternating manner, and the thickness of each layer is 110-140 mm, and the thickness of anthracite is 50-85 mm.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112321290A (en) * | 2020-12-01 | 2021-02-05 | 牟春树 | Method for producing sintered forsterite |
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| 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 |
| CN104961473A (en) * | 2015-06-02 | 2015-10-07 | 海城华宇耐火材料有限公司 | Method for producing export magnesium-rich olivine sand with MgO content less than 70% |
| CN108358621A (en) * | 2018-03-02 | 2018-08-03 | 合肥铭佑高温技术有限公司 | A method of producing forsterite refractory |
| CN108929107A (en) * | 2018-08-17 | 2018-12-04 | 河南科技大学 | A kind of light forsterite refractory aggregate and preparation method thereof |
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2020
- 2020-01-16 CN CN202010045535.6A patent/CN111017941A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| 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 |
| CN104961473A (en) * | 2015-06-02 | 2015-10-07 | 海城华宇耐火材料有限公司 | Method for producing export magnesium-rich olivine sand with MgO content less than 70% |
| CN108358621A (en) * | 2018-03-02 | 2018-08-03 | 合肥铭佑高温技术有限公司 | A method of producing forsterite refractory |
| CN108929107A (en) * | 2018-08-17 | 2018-12-04 | 河南科技大学 | A kind of light forsterite refractory aggregate and preparation method thereof |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112321290A (en) * | 2020-12-01 | 2021-02-05 | 牟春树 | Method for producing sintered forsterite |
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Application publication date: 20200417 |