CN104844230A - Method for preparing hydration resistant calcium-containing sand by recovering carbon-containing refractory product wastes - Google Patents
Method for preparing hydration resistant calcium-containing sand by recovering carbon-containing refractory product wastes Download PDFInfo
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- CN104844230A CN104844230A CN201510197712.1A CN201510197712A CN104844230A CN 104844230 A CN104844230 A CN 104844230A CN 201510197712 A CN201510197712 A CN 201510197712A CN 104844230 A CN104844230 A CN 104844230A
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Abstract
The invention relates to a method for preparing hydration resistant calcium-containing sand by recovering carbon-containing refractory product wastes, and concretely relates to a method for processing carbon-containing unburned refractory product wastes and preparing hydration resistant calcium-containing sand. The method comprises the following steps: crushing calcium-containing sand to granularity required by magnesium-carbon-calcium bricks, dolomite-carbon bricks, calcium oxide-carbon bricks, castables and other refractory products, mixing the crushed calcium-containing sand with the carbon-containing refractory product wastes, calcining at 500-700DEG C, removing amorphous carbon from the carbon-containing refractory product wastes, recovering magnesium oxide and graphite from magnesium-carbon bricks, recovering magnesium-calcium sand and graphite from the magnesium-carbon-calcium bricks, and covering the surface of the calcium-containing sand with a thin CaCO3 film to realize calcium-containing product hydration resistance in order to prepare the calcium-containing sand with good hydration resistance. The hydration resistant calcium-containing sand can effectively protect high quality magnesian marble, alumina ore and graphite resources in China, and reduces the production cost of refractory materials.
Description
Technical field
The present invention relates to a kind of method preparing the calcic sand of water resistant, particularly relate to a kind of method reclaiming waste and old carbonaceous article and prepare the calcium sand of water resistant, calcium magnesia sand, dolomite sand.
Background technology
Magnesia carbon brick and magnesia-calcium-carbon brick have that refractoriness is high, heat-shock resistance is excellent and the good characteristic such as corrosion resistance is strong and be widely used in iron and steel enterprise, as converter steelmaking and Electric furnace steel making.But the aggregate of magnesia carbon brick is highly purified electric smelting or magnesite clinker (general MgO >=95%), and base portion is high purity graphite and highly-purity magnesite.Along with the transition exploitation of magnesite and graphite resource, these national strategy resources are faced with exhausted danger, especially superfine magnesite and graphite reserves little.Can from waste and old carbonaceous article and effectively reclaim useful resources, become a difficult problem.
Magnesia-calica refractory has the function of good high temperature resistant, slag resistance, resistance to heat shocks, high-temperature vacuum stability inferior and cleaning molten steel, is the first-selected refractory materials during Clean Steel Smelting is produced.Magnesium calcium system magnesium refractory materials also has the advantage such as low value, environmental protection, is the best equivalent material of magnesia chrome brick in cement rotary kiln.In addition, the magnesium calcium system refractory product after serious damage can also, as the modification agent of soil, be a kind of environmental type refractory materials.CaO fire resistant materials material is a kind of refractory materials of excellence, is one of the most stable oxide compound, reacts hardly with various molten metal.Meanwhile, along with people are to the research of CaO hydrating capacity, propose the method for various raising CaO hydration resistance, many technology have dropped into industrial production application.Therefore, CaO refractory materials is widely used in hot environment field, as the smelting of iron and steel, in the refining of alloy and casting industry.
But the calcium ion of CaO is arranged in the octahedral interstices of oxonium ion, its lattice parameter is comparatively large, be 0.48nm, and density is only 3.32g/cm
-3, therefore its crystalline network is comparatively loose, tool unstable, and Yi Yushui reacts, even if at normal temperatures, also can react with water, and the Ca (OH) generated
2can produce expansion effect, goods are cracked and bursts apart, Here it is, and calcia material uses the major cause be restricted.For this reason, large quantifier elimination has done in various countries, and makes some progress, some technology applied in industrial production, but also fundamentally do not solve the problem of its water resistant.
Summary of the invention
The object of the invention is to waste and old carbon-containing refractory article for resource; therefrom extract the resources such as useful electrosmelted magnesite clinker (calcium magnesia sand), aluminum oxide, carbon element and graphite; prepare the excellent calcium magnesia sand of hydration resistance, dolomite sand and calcium sand simultaneously; the method will effectively protect the high-quality magnesite of China, bauxite mine and graphite resource; reduce the production cost of refractory materials, obtain social influence and economic benefit.
The object of the invention is to be achieved through the following technical solutions:
A kind of method reclaiming waste and old carbon-containing refractory article and prepare water resistant calcic sand, after calcic sand is broken into the granularity preparing magnesia-calcium-carbon brick, rhombspar carbon brick and the refractory product such as calcium oxide carbon brick and mould material by described method, put together with waste and old carbon-containing refractory article, calcine under the condition of 500-700 DEG C, after insulation for some time, remove the indefinite form carbon in waste and old carbon-containing refractory article, reclaim the magnesium oxide in magnesia carbon brick and graphite, reclaim the calcium magnesia sand in magnesia-calcium-carbon brick and graphite, and make the CaCO that surface coverage one deck of calcic sand is thin
3film, plays the effect containing calcium product preventing hydration, prepares calcic sand.
A kind of described method reclaiming waste and old carbon-containing refractory article and prepare water resistant calcic sand, described calcic sand comprises calcium magnesia sand, or dolomite sand, high calcium dolomite sand, calcium oxide sand.
A kind of described method reclaiming waste and old carbon-containing refractory article and prepare water resistant calcic sand, described useless carbon-containing refractory article comprises waste magnesia carbon brick, or waste and old magnesia-calcium-carbon brick, waste and old magnesia-alumina-carbon brick etc. do not burn refractory product, carbon element and charcoal goods.
A kind of described method reclaiming waste and old carbon-containing refractory article and prepare water resistant calcic sand, puts together waste and old carbon-containing refractory article and calcic sand, and under the condition of 400-800 DEG C, soaking time is 0.2-24 hour.
Advantage of the present invention and effect are:
The present invention can effectively process waste and old carbon-containing refractory article; prepare the calcic refractory product that hydration resistance is excellent; to effectively protect high-quality magnesite and the graphite resource of China; solve a preventing hydration difficult problem for preparation of calcium oxide refractory; reduce the production cost of refractory materials, huge Social benefit and economic benefit can be brought.
Embodiment
Below in conjunction with embodiment, the invention will be further described.
Embodiment 1:
(1) method is as follows:
Be that the calcium magnesia sand of 10wt% is broken into 5-8mm, 3-5mm, 3-1mm, 1-0mm and is less than the calcium magnesia sand of 0.088mm by CaO content, put together with waste and old magnesia carbon brick, calcine under the condition of 400-800 DEG C, insulation 0.5-24 hour, remove the irregular GAC in waste magnesia carbon brick, reclaim the magnesium oxide in magnesia carbon brick and graphite, and make the CaCO that surface coverage one deck of magnesium calcium magnesia sand is thin
3film, plays the effect of calcium magnesia sand preventing hydration, prepares the calcium magnesia sand that hydration-resistent is good.
(2) detected result
(1) chemical composition of magnesia carbon brick after reclaiming;
MgO>85.0wt%, crystalline flake graphite >10.0wt%; SiO
2<2.0wt%; Other <4.0wt%
(2) chemical composition of calcium magnesia sand:
5-8mm: MgO:87.0wt%; CaO:9.8wt%; CaCO
3: 0.2wt%; MgCO
3: 1.0wt%; Other <2.0wt%
3-5mm:MgO:86.8wt%; CaO:9.7wt%; CaCO
3: 0.3wt%; MgCO
3: 1.2wt%; Other <2.0wt%
3-1mm:MgO:86.7wt%; CaO:9.6wt%; CaCO
3: 0.4wt%; MgCO
3: 1.3wt%; Other <2.0wt%
1-0m:MgO:86.5wt%; CaO:9.5wt%; CaCO
3: 0.5wt%; MgCO
3: 1.5wt%; Other <2.0wt%
<0.088mm:MgO:86.1wt%; CaO:9.3wt%; CaCO
3: 0.7wt%; MgCO
3: 1.9wt%; Other <2.0wt%
Calcium magnesia sand placement quality in February does not change substantially
Embodiment 2:
(1) method is as follows:
Be that the calcium magnesia sand of 50wt% is broken into 5-8mm, 3-5mm, 3-1mm, 1-0mm and is less than the calcium magnesia sand of 0.088mm by CaO content, put together with waste and old magnesia carbon brick, calcine under the condition of 400-800 DEG C, insulation 0.5-24 hour, remove the irregular GAC in waste magnesia carbon brick, reclaim the magnesium oxide in magnesia carbon brick and graphite, and make the CaCO that surface coverage one deck of calcium magnesia sand is thin
3film, plays the effect of calcium magnesia sand preventing hydration, prepares the calcium magnesia sand that hydration-resistent is good.
(2) detected result
(1) chemical composition of magnesia carbon brick after reclaiming;
MgO>85.0wt%, crystalline flake graphite >10.0wt%; SiO
2<2.0wt%; Other <4.0wt%
(2) chemical composition of calcium magnesia sand:
5-8mm: MgO:47.6wt%; CaO:49.5wt%; CaCO
3: 0.5wt%; MgCO
3: 0.4wt%; Other <2.0wt%
3-5mm:MgO:47.6wt%; CaO:49.5wt%; CaCO
3: 0.5wt%; MgCO
3: 0.4wt%; Other <2.0wt%
3-1mm:MgO:47.5wt%; CaO:49.4wt%; CaCO
3: 0.6wt%; MgCO
3: 0.5wt%; Other <2.0wt%
1-0m:MgO:47.4wt%; CaO:49.2wt%; CaCO
3: 0.8wt%; MgCO
3: 0.6wt%; Other <2.0wt%
<0.088mm:MgO:47.1wt%; CaO:49.0wt%; CaCO
3: 1.0wt%; MgCO
3: 0.9wt%; Other <2.0wt%
Calcium magnesia sand placement quality in February does not change substantially
Embodiment 3:
(1) method is as follows:
Be that the calcium magnesia of 80wt% is broken into 5-8mm, 3-5mm, 3-1mm, 1-0mm and is less than the calcium magnesia sand of 0.088mm by CaO content, put together with waste and old magnesia-calcium-carbon brick, calcine under the condition of 500-800 DEG C, insulation 0.5-24 hour, remove waste and old containing the irregular GAC in magnesia-calcium-carbon brick, reclaim the calcium magnesia sand in magnesia-calcium-carbon brick and graphite, and make the CaCO that surface coverage one deck of calcium magnesia is thin
3film, plays the effect of calcium magnesia sand preventing hydration, prepares the calcium magnesia sand that hydration-resistent is good.
(2) detected result
(1) chemical composition of magnesia carbon brick after reclaiming;
MgO>65.0wt%, CaO>20.0%, crystalline flake graphite >10.0wt%; SiO
2<2.0wt%; Other <4.0wt%
(2) chemical composition of calcium magnesia sand:
5-8mm: MgO:17.9wt%; CaO:79.8wt%; CaCO
3: 0.2wt%; MgCO
3: 0.1wt%; Other <2.0wt%
3-5mm:MgO:17.9wt%; CaO:79.7wt%; CaCO
3: 0.3wt%; MgCO
3: 0.1wt%; Other <2.0wt%
3-1mm:MgO:17.8wt%; CaO:79.6wt%; CaCO
3: 0.4wt%; MgCO
3: 0.2wt%; Other <2.0wt%
1-0m:MgO:17.7wt%; CaO:79.5wt%; CaCO
3: 0.5wt%; MgCO
3: 0.3wt%; Other <2.0wt%
<0.088mm:MgO:17.6wt%; CaO:79.3wt%; CaCO
3: 0.7wt%; MgCO
3: 0.4wt%; Other <2.0wt%
Calcium magnesia placement quality in February does not change substantially
Embodiment 4:
a kind of method preparing calcium oxide brick
(1) method is as follows:
Be that the calcium sand of 98.0wt% is broken into 5-8mm, 3-5mm, 3-1mm, 1-0mm and is less than the calcium magnesia sand of 0.088mm by CaO content, put together with waste and old magnesia carbon brick, calcine under the condition of 400-800 DEG C, insulation 0.5-24 hour, remove the irregular GAC in waste magnesia carbon brick, reclaim the magnesia in magnesia carbon brick and graphite, and make the CaCO that surface coverage one deck of calcium magnesia is thin
3film, plays the effect of calcium sand preventing hydration, prepares the calcium magnesia sand that hydration-resistent is good.
(2) detected result
(1) chemical composition of magnesia carbon brick after reclaiming;
MgO>85.0wt%, crystalline flake graphite >10.0wt%; SiO
2<2.0wt%; Other <4.0wt%
(2) chemical composition of calcium magnesia sand:
5-8mm: CaO:97.8wt%; CaCO
3: 0.2wt%; Other <2.0wt%
3-5mm:CaO:97.8wt%; CaCO
3: 0.2wt%; Other <2.0wt%
3-1mm:CaO:97.6wt%; CaCO
3: 0.4wt%; Other <2.0wt%
1-0m:CaO:97.5wt%; CaCO
3: 0.5wt%; Other <2.0wt%
<0.088mm:CaO:97.3wt%; CaCO
3: 0.7wt%; Other <2.0wt%
Calcium magnesia placement quality in February does not change substantially
Embodiment 5:
(1) method is as follows:
Be that the calcium magnesia sand of 40wt% is broken into 5-8mm, 3-5mm, 3-1mm, 1-0mm and is less than the calcium magnesia sand of 0.088mm by CaO content, put together with waste and old magnesia-alumina-carbon brick, calcine under the condition of 400-800 DEG C, insulation 0.5-24 hour, remove the irregular GAC in waste and old magnesia-alumina-carbon brick, reclaim magnesium oxide, aluminum oxide and the graphite in magnesium carbon aluminium brick, and make the CaCO that surface coverage one deck of calcium magnesia sand is thin
3film, plays the effect of calcium magnesia sand preventing hydration, prepares the calcium magnesia sand that hydration-resistent is good.
(2) detected result
(1) chemical composition of magnesia carbon brick after reclaiming;
MgO>56.0wt%; Al
2o
3>30.0wt%; Crystalline flake graphite >10.0wt%; SiO
2<2.0wt%; Other <3.0wt%
(2) chemical composition of calcium magnesia sand:
5-8mm: MgO:57.8wt%; CaO:39.8wt%; CaCO
3: 0.2wt%; MgCO
3: 0.2wt%; Other <2.0wt%
3-5mm:MgO:57.8wt%; CaO:39.8wt%; CaCO
3: 0.2wt%; MgCO
3: 0.2wt%; Other <2.0wt%
3-1mm:MgO:57.7wt%; CaO:39.7wt%; CaCO
3: 0.3wt%; MgCO
3: 0.3wt%; Other <2.0wt%
1-0m:MgO:57.6wt%; CaO:39.6wt%; CaCO
3: 0.4wt%; MgCO
3: 0.4wt%; Other <2.0wt%
<0.088mm:MgO:57.4wt%; CaO:39.5wt%; CaCO
3: 0.5wt%; MgCO
3: 0.6wt%; Other <2.0wt%
Calcium magnesia sand placement quality in February does not change substantially
Embodiment 6:
(1) method is as follows:
Be that the calcium magnesia sand of 60wt% is broken into 5-8mm, 3-5mm, 3-1mm, 1-0mm and is less than the calcium magnesia sand of 0.088mm by CaO content, put together with waste and old carbon aluminium brick, calcine under the condition of 400-800 DEG C, insulation 0.5-24 hour, the CaCO that surface coverage one deck of calcium magnesia sand is thin
3film, plays the effect of calcium magnesia sand preventing hydration, prepares the calcium magnesia sand that hydration-resistent is good.
(2) detected result
(1) chemical composition of calcium magnesia sand:
5-8mm: MgO:37.9wt%; CaO:59.9wt%; CaCO
3: 0.1wt%; MgCO
3: 0.1wt%; Other <2.0wt%
3-5mm:MgO:37.9wt%; CaO:59.9wt%; CaCO
3: 0.1wt%; MgCO
3: 0.1wt%; Other <2.0wt%
3-1mm:MgO:37.8wt%; CaO:59.8wt%; CaCO
3: 0.2wt%; MgCO
3: 0.2wt%; Other <2.0wt%
1-0m:MgO:37.7wt%; CaO:59.7wt%; CaCO
3: 0.3wt%; MgCO
3: 0.3wt%; Other <2.0wt%
<0.088mm:MgO:37.5wt%; CaO:59.5wt%; CaCO
3: 0.5wt%; MgCO
3: 0.5wt%; Other <2.0wt%
Calcium magnesia sand placement quality in February does not change substantially
Embodiment 7:
(1) method is as follows:
Be that the electric smelting calcium oxide sand of 98wt% is broken into 5-8mm, 3-5mm, 3-1mm, 1-0mm and is less than the calcium sand of 0.088mm by CaO content, put together with waste and old carbon product, calcine under the condition of 100-700 DEG C, insulation 0.5-24 hour, the CaCO that surface coverage one deck of calcium magnesia sand is thin
3film, plays the effect of calcium magnesia sand preventing hydration, prepares the calcium magnesia sand that hydration-resistent is good.
(2) detected result
(1) chemical composition of electric smelting calcium sand:
5-8mm: CaO:97.8wt%; CaCO
3: 0.2wt%; Other <2.0wt%
3-5mm:CaO:97.8wt%; CaCO
3: 0.2wt%; Other <2.0wt%
3-1mm:CaO:97.6wt%; CaCO
3: 0.4wt%; Other <2.0wt%
1-0m:CaO:97.5wt%; CaCO
3: 0.5wt%; Other <2.0wt%
<0.088mm:CaO:97.3wt%; CaCO
3: 0.7wt%; Other <2.0wt%
Calcium magnesia sand placement quality in February does not change substantially
Embodiment 8:
(1) method is as follows:
Be that the electric smelting calcium oxide sand of 98wt% is broken into 5-8mm, 3-5mm, 3-1mm, 1-0mm and is less than the calcium sand of 0.088mm by CaO content, put together with waste and old charcoal, calcine under the condition of 100-700 DEG C, insulation 0.5-24 hour, the CaCO that surface coverage one deck of calcium magnesia sand is thin
3film, plays the effect of calcium magnesia sand preventing hydration, prepares the calcium magnesia sand that hydration-resistent is good.
(2) detected result
(1) chemical composition of electric smelting calcium sand:
5-8mm: CaO:97.8wt%; CaCO
3: 0.2wt%; Other <2.0wt%
3-5mm:CaO:97.8wt%; CaCO
3: 0.2wt%; Other <2.0wt%
3-1mm:CaO:97.6wt%; CaCO
3: 0.4wt%; Other <2.0wt%
1-0m:CaO:97.5wt%; CaCO
3: 0.5wt%; Other <2.0wt%
<0.088mm:CaO:97.3wt%; CaCO
3: 0.7wt%; Other <2.0wt%
Calcium magnesia sand placement quality in February does not change substantially.
Claims (4)
1. the method reclaiming waste and old carbon-containing refractory article and prepare water resistant calcic sand, it is characterized in that, after calcic sand is broken into the granularity preparing magnesia-calcium-carbon brick, rhombspar carbon brick and the refractory product such as calcium oxide carbon brick and mould material by described method, put together with waste and old carbon-containing refractory article, calcine under the condition of 500-700 DEG C, after insulation for some time, remove the indefinite form carbon in waste and old carbon-containing refractory article, reclaim the magnesium oxide in magnesia carbon brick and graphite, reclaim the calcium magnesia sand in magnesia-calcium-carbon brick and graphite, and make the CaCO that surface coverage one deck of calcic sand is thin
3film, plays the effect containing calcium product preventing hydration, prepares calcic sand.
2. a kind of method reclaiming waste and old carbon-containing refractory article and prepare water resistant calcic sand according to claim 1, its feature in, described calcic sand comprises calcium magnesia sand, or dolomite sand, high calcium dolomite sand, calcium oxide sand.
3. a kind of method reclaiming waste and old carbon-containing refractory article and prepare water resistant calcic sand according to claim 1, it is characterized in that, described useless carbon-containing refractory article comprises waste magnesia carbon brick, or waste and old magnesia-calcium-carbon brick, waste and old magnesia-alumina-carbon brick etc. do not burn refractory product, carbon element and charcoal goods.
4. a kind of method reclaiming waste and old carbon-containing refractory article and prepare water resistant calcic sand according to claim 1, it is characterized in that, waste and old carbon-containing refractory article and calcic sand are put together, under the condition of 400-800 DEG C, soaking time is 0.2-24 hour.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510197712.1A CN104844230A (en) | 2015-04-24 | 2015-04-24 | Method for preparing hydration resistant calcium-containing sand by recovering carbon-containing refractory product wastes |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510197712.1A CN104844230A (en) | 2015-04-24 | 2015-04-24 | Method for preparing hydration resistant calcium-containing sand by recovering carbon-containing refractory product wastes |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107200564A (en) * | 2017-06-30 | 2017-09-26 | 张静芬 | A kind of high-strength refractory insulated pouring material |
| CN113321491A (en) * | 2021-06-24 | 2021-08-31 | 武汉钢铁有限公司 | Converter low-carbon magnesia carbon brick with water-resisting layer and preparation method thereof |
| CN113357916A (en) * | 2021-05-28 | 2021-09-07 | 海城利尔麦格西塔材料有限公司 | Magnesium-calcium refractory brick with reinforced protective layer and preparation method thereof |
-
2015
- 2015-04-24 CN CN201510197712.1A patent/CN104844230A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107200564A (en) * | 2017-06-30 | 2017-09-26 | 张静芬 | A kind of high-strength refractory insulated pouring material |
| CN113357916A (en) * | 2021-05-28 | 2021-09-07 | 海城利尔麦格西塔材料有限公司 | Magnesium-calcium refractory brick with reinforced protective layer and preparation method thereof |
| CN113321491A (en) * | 2021-06-24 | 2021-08-31 | 武汉钢铁有限公司 | Converter low-carbon magnesia carbon brick with water-resisting layer and preparation method thereof |
| CN113321491B (en) * | 2021-06-24 | 2022-02-18 | 武汉钢铁有限公司 | Converter low-carbon magnesia carbon brick with water-resisting layer and preparation method thereof |
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Application publication date: 20150819 |