CN100462451C - Method of processing raw materials for production of ferrosilicon silicocalcium and high purity silicon - Google Patents
Method of processing raw materials for production of ferrosilicon silicocalcium and high purity silicon Download PDFInfo
- Publication number
- CN100462451C CN100462451C CNB2006100775833A CN200610077583A CN100462451C CN 100462451 C CN100462451 C CN 100462451C CN B2006100775833 A CNB2006100775833 A CN B2006100775833A CN 200610077583 A CN200610077583 A CN 200610077583A CN 100462451 C CN100462451 C CN 100462451C
- Authority
- CN
- China
- Prior art keywords
- raw material
- ferrosilicon
- coke
- calcium
- silico
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Landscapes
- Silicon Compounds (AREA)
Abstract
The invention relate to smelt technology field, especially relate to a method of processing raw material of ferrosilicium, silicon calcium and monocrystalline silicon, the feature as follow: disintegrating silica dioxide and carbon raw material to powder that the particle diameter less than 1mm, according to weight ratio SiO2:C=1:(0.4-0.6) to modeling; The described modeling method is that silica dioxide and carbon raw material powder are mixed, and then take into mixer to mix, add the water that the weight is 3-15% of raw material weight, after intimate mixing, take into cold-roll-forming machine to press forming, the forming ball material sun-cure and natural ventilating dry after denaturation treatment; the method substantial increase reaction contact area, improve the chemical reaction speed in the stove, decrease the electrical energy consumption apparently and improve production.
Description
Technical field
The present invention relates to technical field of smelting, especially relate to a kind of working method of producing the raw material of ferrosilicon, silico-calcium and HIGH-PURITY SILICON in the electric smelting furnace.
Background technology
At present, the smelting of ferrosilicon and silico-calcium, it is the granularity that carbon raw materials is crushed to 10～30mm, silica: large capacity electric stove is processed into the bulk of 40～120mm, be processed into the bulk of 25～80mm below the electric furnace 3000kva of low capacity, certain proportion according to silicon-dioxide and charcoal element is gone into stove production, adopt this raw material production, because coal, raw materials such as silica all have certain particle, especially coal, it does not melt in smelting furnace all the time, works as silica, after the lime fusing, on the surface of coal with progress in the hole of coal, just can carry out chemical reaction, the contact area of reactant is very limited like this, thereby chemical reaction velocity is slower, thereby has seriously influenced output, and be accompanied by the raising of energy consumption, adopt present raw material production generally to have a daily output of 20～25 tons, ton power consumption 8400～9000kvA, the ton power consumption of silico-calcium is at 13000kvA; This shows the raw material that adopts present working method to produce, its power consumption is very high, and serious wastes energy, and yields poorly.
Summary of the invention
The objective of the invention is to overcome the deficiencies in the prior art, a kind of reaction contact area, interior chemical reaction velocity of raising stove that can increase considerably raw material is provided, can obviously reduces a kind of working method of producing the raw material of ferrosilicon, silico-calcium and HIGH-PURITY SILICON of power consumption, raising output.
The present invention realizes in the following way:
A kind of working method of producing the raw material of ferrosilicon, silico-calcium and HIGH-PURITY SILICON is characterized in that: respectively silicon-dioxide and carbon raw materials being crushed to the smalls below the 1mm, is SiO according to weight ratio
2: ratio moulding C=1:(0.4～0.6), described forming method is charcoal element, silica material fine powder to be mixed to add in the stirrer stir, 3-15% the moisture that adds raw material weight again, after waiting to stir, add compression moulding in the roller briquetting machine, airing in nature after the denaturing treatment of moulding good shot material, natural air drying, described denaturing treatment are meant that being stained with particle diameter that the one deck below the 1mm processes on the surface of ball material is silicon dioxide powder below the 1mm;
1～10% the caking agent that adds raw material weight in the time of described stirring;
Described caking agent is polyacrylamide, polyvinyl alcohol, Walocel MT 20.000PV, unsaturated polyester or digestion lime;
Described carbon raw materials is coke and hard coal, and wherein the weight percentage of coke is 20%, anthracitic weight percentage is 80%;
Described carbon raw materials is coke and hard coal, and wherein the weight percentage of coke is 30%, anthracitic weight percentage is 70%;
Described carbon raw materials is coke and hard coal, and wherein the weight percentage of coke is 10%, anthracitic weight percentage is 90%.
The present invention has following effect:
The height of electric smelting furnace's output is exactly the branch of the speed of chemical reaction velocity, and traditional smelting process, the limited contact area of carbon raw materials and silica are to hinder the key point that speed of response improves.If bumping with a silicon dioxide molecules, two carbon atoms are in the same place, temperature is in the time of 2000 ℃, speed of response is quickish, also faster than congruent melting speed, but the raw material coke of electric furnace is block, do not exist with atomic condition, have only the silica of fusing to react with carbon on the surface of carbon and in the pore of continuous infiltration coke, measured response contact area has like this hindered greatly the speed of chemical reaction; And the raw material that adopts method provided by the invention to produce, silica and carbon raw materials all are the following fine powders of 1mm, and two kinds of raw materials mix compressed together, thereby enlarged reaction contact area greatly, when smelting temperature one arrives, the atom and the molecule number of participating in reaction are many, and therefore whole chemical time is just short, so the output in the unit time is just high, thereby the product energy consumption of unit mass is just low.Charcoal element and silicon-dioxide all are that solid is not a gas, the probability that two kinds of molecules freely collide equals zero, and method provided by the invention is fully levigate with two kinds of materials, be blended together uniformly, two kinds of material molecules probability of piling up has increased greatly, when the energy of supplying with when the external world reached activate request, reaction had been finished soon.Proof adopts the method reaction times provided by the invention to shorten 1/3rd than originally by experiment.
In order to improve the resistivity of ball material, the present invention has carried out denaturing treatment to the ball material, can improve the electric property of raw material so greatly, and electric furnace electrode is inserted in the bed of material deeply, reduces thermosteresis, improves electrical efficiency.
Embodiment
Embodiment 1: a kind of working method of producing the raw material of ferrosilicon, silico-calcium and HIGH-PURITY SILICON is respectively that 20% coke, 80% pulverized anthracite are broken to the smalls below the 1mm with silicon-dioxide and weight percentage, is SiO according to weight ratio
2: ratio moulding C=1:(0.4～0.6).
Forming method is coke, hard coal and silica material fine powder to be mixed to add in the stirrer stir, 3-15% the moisture that adds raw material weight again, after waiting to stir, add compression moulding in the roller briquetting machine, airing in nature after the denaturing treatment of moulding good shot material, natural air drying.Described denaturing treatment is meant that being stained with the particle diameter that the one deck below the 1mm processes on the surface of ball material is the silicon dioxide powder of 0～1mm, method is the exhaust end at ball press outfeed belt conveyor, make an inclined-plane, load onto or sprinkle the silicon dioxide powder that is mixed with caking agent, wherein caking agent 3～10%, moisture is 5～30%, pellet rolls down from above, just be stained with the layer of silicon dioxide powder, perhaps will be mixed with the silicon dioxide powder of caking agent, be sprinkling upon on the pellet of spreading out, artificial overturning also can achieve the goal several times.
Embodiment 2: a kind of working method of producing the raw material of ferrosilicon, silico-calcium and HIGH-PURITY SILICON is respectively that 30% coke, 70% pulverized anthracite are broken to the smalls below the 1mm with silicon-dioxide and weight percentage, is SiO according to weight ratio
2: ratio moulding C=1:(0.4～0.6).
Forming method is coke, hard coal and silica material fine powder to be mixed to add in the stirrer stir, 3-15% the moisture that adds raw material weight again, 1～10% of the adding raw material weight polyacrylamide is as caking agent when stirring, after waiting to stir, add compression moulding in the roller briquetting machine, airing in nature after the denaturing treatment of moulding good shot material, natural air drying.Described denaturing treatment is meant that being stained with the particle diameter that the one deck below the 1mm processes on the surface of ball material is the silicon dioxide powder of 0～1mm, method is the exhaust end at ball press outfeed belt conveyor, make an inclined-plane, load onto or sprinkle the silicon dioxide powder that is mixed with caking agent, wherein caking agent 3～10%, moisture is 5～30%, pellet rolls down from above, just be stained with the layer of silicon dioxide powder, perhaps will be mixed with the silicon dioxide powder of caking agent, be sprinkling upon on the pellet of spreading out, artificial overturning also can achieve the goal several times.
Embodiment 3: a kind of working method of producing the raw material of ferrosilicon, silico-calcium and HIGH-PURITY SILICON is respectively that 10% coke, 90% pulverized anthracite are broken to the smalls below the 1mm with silicon-dioxide and weight percentage, is SiO according to weight ratio
2: ratio moulding C=1:(0.4～0.6).
Forming method is coke, hard coal and silica material fine powder to be mixed to add in the stirrer stir, 3-15% the moisture that adds raw material weight again, 1～10% of the adding raw material weight polyvinyl alcohol is as caking agent when stirring, after waiting to stir, add compression moulding in the roller briquetting machine, airing in nature after the denaturing treatment of moulding good shot material, natural air drying.Described denaturing treatment is meant that being stained with particle diameter that the one deck below the 1mm processes on the surface of ball material is silicon dioxide powder below the 1mm, method is the exhaust end at ball press outfeed belt conveyor, make an inclined-plane, load onto or sprinkle the silicon dioxide powder that is mixed with caking agent, wherein caking agent 3～10%, moisture is 5～30%, pellet rolls down from above, just be stained with the layer of silicon dioxide powder, perhaps will be mixed with the silicon dioxide powder of caking agent, be sprinkling upon on the pellet of spreading out, artificial overturning also can achieve the goal several times.
Embodiment 4: a kind of working method of producing the raw material of ferrosilicon, silico-calcium and HIGH-PURITY SILICON is respectively that 40% coke, 60% pulverized anthracite are broken to the smalls below the 1mm with silicon-dioxide and weight percentage, is SiO according to weight ratio
2: ratio moulding C=1:(0.4～0.6),
Forming method is coke, hard coal and silica material fine powder to be mixed to add in the stirrer stir, 3-15% the moisture that adds raw material weight again, 1～10% of the adding raw material weight Walocel MT 20.000PV is as caking agent when stirring, after waiting to stir, add compression moulding in the roller briquetting machine, airing in nature after the denaturing treatment of moulding good shot material, natural air drying.Described denaturing treatment is meant that being stained with particle diameter that the one deck below the 1mm processes on the surface of ball material is silicon dioxide powder below the 1mm, method is the exhaust end at ball press outfeed belt conveyor, make an inclined-plane, load onto or sprinkle the silicon dioxide powder that is mixed with caking agent, wherein caking agent 3～10%, moisture is 5～30%, pellet rolls down from above, just be stained with the layer of silicon dioxide powder, perhaps will be mixed with the silicon dioxide powder of caking agent, be sprinkling upon on the pellet of spreading out, artificial overturning also can achieve the goal several times.
Embodiment 5: a kind of working method of producing the raw material of ferrosilicon, silico-calcium and HIGH-PURITY SILICON is respectively that 50% coke, 50% pulverized anthracite are broken to the smalls below the 1mm with silicon-dioxide and weight percentage, is SiO according to weight ratio
2: ratio moulding C=1:(0.4～0.6),
Forming method is coke, hard coal and silica material fine powder to be mixed to add in the stirrer stir, 3-15% the moisture that adds raw material weight again, 1～10% of the adding raw material weight unsaturated polyester is as caking agent when stirring, after waiting to stir, add compression moulding in the roller briquetting machine, airing in nature after the denaturing treatment of moulding good shot material, natural air drying.Described denaturing treatment is meant that being stained with particle diameter that the one deck below the 1mm processes on the surface of ball material is silicon dioxide powder below the 1mm, method is the exhaust end at ball press outfeed belt conveyor, make an inclined-plane, load onto or sprinkle the silicon dioxide powder that is mixed with caking agent, wherein caking agent 3～10%, moisture is 5～30%, pellet rolls down from above, just be stained with the layer of silicon dioxide powder, perhaps will be mixed with the silicon dioxide powder of caking agent, be sprinkling upon on the pellet of spreading out, artificial overturning also can achieve the goal several times.
Embodiment 6: a kind of working method of producing the raw material of ferrosilicon, silico-calcium and HIGH-PURITY SILICON is respectively that 60% coke, 40% pulverized anthracite are broken to the smalls less than 1mm with silicon-dioxide and weight percentage, is SiO according to weight ratio
2: ratio moulding C=1:(0.4～0.6),
Forming method is coke, hard coal and silica material fine powder to be mixed to add in the stirrer stir, 3-15% the moisture that adds raw material weight again, 1～10% of the adding raw material weight digestion lime is as caking agent when stirring, the butt weight content is 30～32%, after waiting to stir, add compression moulding in the roller briquetting machine, airing in nature after the denaturing treatment of moulding good shot material, natural air drying.Described denaturing treatment is meant that being stained with the particle diameter that the one deck below the 1mm processes on the surface of ball material is the silicon dioxide powder of 0～1mm, method is the exhaust end at ball press outfeed belt conveyor, make an inclined-plane, load onto or sprinkle the silicon dioxide powder that is mixed with caking agent, wherein caking agent 3～10%, moisture is 5～30%, pellet rolls down from above, just be stained with the layer of silicon dioxide powder, perhaps will be mixed with the silicon dioxide powder of caking agent, be sprinkling upon on the pellet of spreading out, artificial overturning also can achieve the goal several times.
Embodiment 7: a kind of working method of producing the raw material of ferrosilicon, silico-calcium and HIGH-PURITY SILICON is respectively that 10% coke, 90% pulverized anthracite are broken to the smalls less than 1mm with silicon-dioxide and weight percentage, is SiO according to weight ratio
2: ratio moulding C=1:(0.4～0.6),
Forming method is coke, hard coal and silica material fine powder to be mixed to add in the stirrer stir, 3-15% the moisture that adds raw material weight again, 1～10% of the adding raw material weight digestion lime is as caking agent when stirring, the butt weight content is 30～32%, after waiting to stir, add compression moulding in the roller briquetting machine, airing in nature after the denaturing treatment of moulding good shot material, natural air drying.Described denaturing treatment is meant that being stained with the particle diameter that the one deck below the 1mm processes on the surface of ball material is the silicon dioxide powder of 0～1mm, method is the exhaust end at ball press outfeed belt conveyor, make an inclined-plane, load onto or sprinkle the silicon dioxide powder that is mixed with caking agent, wherein caking agent 3～10%, moisture is 5～30%, pellet rolls down from above, just be stained with the layer of silicon dioxide powder, perhaps will be mixed with the silicon dioxide powder of caking agent, be sprinkling upon on the pellet of spreading out, artificial overturning also can achieve the goal several times.
Embodiment 8: a kind of working method of producing the raw material of ferrosilicon, silico-calcium and HIGH-PURITY SILICON is respectively that 100% coke is crushed to the smalls less than 1mm with silicon-dioxide and weight percentage, is SiO according to weight ratio
2: ratio moulding C=1:(0.4～0.6),
Forming method is coke, hard coal and silica material fine powder to be mixed to add in the stirrer stir, 3-15% the moisture that adds raw material weight again, 1～10% of the adding raw material weight digestion lime is as caking agent when stirring, the butt weight content is 30～32%, after waiting to stir, add compression moulding in the roller briquetting machine, airing in nature after the denaturing treatment of moulding good shot material, natural air drying.Described denaturing treatment is meant that being stained with the particle diameter that the one deck below the 1mm processes on the surface of ball material is the silicon dioxide powder of 0～1mm, method is the exhaust end at ball press outfeed belt conveyor, make an inclined-plane, load onto or sprinkle the silicon dioxide powder that is mixed with caking agent, wherein caking agent 3～10%, moisture is 5～30%, pellet rolls down from above, just be stained with the layer of silicon dioxide powder, perhaps will be mixed with the silicon dioxide powder of caking agent, be sprinkling upon on the pellet of spreading out, artificial overturning also can achieve the goal several times.
Embodiment 9: a kind of working method of producing the raw material of ferrosilicon, silico-calcium and HIGH-PURITY SILICON is respectively that 100% pulverized anthracite is broken to the smalls less than 1mm with silicon-dioxide and weight percentage, is SiO according to weight ratio
2: ratio moulding C=1:(0.4～0.6),
Forming method is coke, hard coal and silica material fine powder to be mixed to add in the stirrer stir, 3-15% the moisture that adds raw material weight again, 1～10% of the adding raw material weight digestion lime is as caking agent when stirring, the butt weight content is 30～32%, after waiting to stir, add compression moulding in the roller briquetting machine, then pack in the container, feed carbonic acid gas and make its carbonization, material shed is enough big, also can in material shed, slowly dry in the shade airing in nature after the denaturing treatment of moulding good shot material, natural air drying.Described denaturing treatment is meant that being stained with the particle diameter that the one deck below the 1mm processes on the surface of ball material is the silicon dioxide powder of 0～1mm, method is the exhaust end at ball press outfeed belt conveyor, make an inclined-plane, load onto or sprinkle the silicon dioxide powder that is mixed with caking agent, wherein caking agent 3～10%, moisture is 5～30%, pellet rolls down from above, just be stained with the layer of silicon dioxide powder, perhaps will be mixed with the silicon dioxide powder of caking agent, be sprinkling upon on the pellet of spreading out, artificial overturning also can achieve the goal several times.
Claims (6)
1. working method of producing the raw material of ferrosilicon, silico-calcium and HIGH-PURITY SILICON is characterized in that: respectively silicon-dioxide and carbon raw materials being crushed to the smalls below the 1mm, is SiO according to weight ratio
2: ratio moulding C=1:(0.4～0.6), described forming method is charcoal element, silica material fine powder to be mixed to add in the stirrer stir, 3-15% the moisture that adds raw material weight again, after waiting to stir, add compression moulding in the roller briquetting machine, airing in nature after the denaturing treatment of moulding good shot material, natural air drying, described denaturing treatment are meant that being stained with particle diameter that the one deck below the 1mm processes on the surface of ball material is silicon dioxide powder below the 1mm.
2. a kind of working method of producing the raw material of ferrosilicon, silico-calcium and HIGH-PURITY SILICON as claimed in claim 1 is characterized in that: 1～10% the caking agent that adds raw material weight in the time of described stirring.
3. a kind of working method of producing the raw material of ferrosilicon, silico-calcium and HIGH-PURITY SILICON as claimed in claim 2 is characterized in that: described caking agent is polyacrylamide, polyvinyl alcohol, Walocel MT 20.000PV, unsaturated polyester or digestion lime.
4. a kind of working method of producing the raw material of ferrosilicon, silico-calcium and HIGH-PURITY SILICON as claimed in claim 1 is characterized in that: described carbon raw materials is coke and hard coal, and wherein the weight percentage of coke is 20%, anthracitic weight percentage is 80%.
5. a kind of working method of producing the raw material of ferrosilicon, silico-calcium and HIGH-PURITY SILICON as claimed in claim 1 is characterized in that: described carbon raw materials is coke and hard coal, and wherein the weight percentage of coke is 30%, anthracitic weight percentage is 70%.
6. a kind of working method of producing the raw material of ferrosilicon, silico-calcium and HIGH-PURITY SILICON as claimed in claim 1 is characterized in that: described carbon raw materials is coke and hard coal, and wherein the weight percentage of coke is 10%, anthracitic weight percentage is 90%.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2006100775833A CN100462451C (en) | 2006-04-30 | 2006-04-30 | Method of processing raw materials for production of ferrosilicon silicocalcium and high purity silicon |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2006100775833A CN100462451C (en) | 2006-04-30 | 2006-04-30 | Method of processing raw materials for production of ferrosilicon silicocalcium and high purity silicon |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1844419A CN1844419A (en) | 2006-10-11 |
| CN100462451C true CN100462451C (en) | 2009-02-18 |
Family
ID=37063389
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2006100775833A Expired - Fee Related CN100462451C (en) | 2006-04-30 | 2006-04-30 | Method of processing raw materials for production of ferrosilicon silicocalcium and high purity silicon |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN100462451C (en) |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1032747A (en) * | 1962-05-21 | 1966-06-15 | Techmet Ltd | Manufacture of ferro-silicon |
| US3660298A (en) * | 1969-11-19 | 1972-05-02 | Union Carbide Corp | Furnace charge for use in the production of silicon metal |
| CN1314498A (en) * | 2001-03-01 | 2001-09-26 | 李文联 | Process for making Al-Si alloy |
| CN1693519A (en) * | 2005-06-01 | 2005-11-09 | 苗怀胜 | Technology for producing silicon iron |
-
2006
- 2006-04-30 CN CNB2006100775833A patent/CN100462451C/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1032747A (en) * | 1962-05-21 | 1966-06-15 | Techmet Ltd | Manufacture of ferro-silicon |
| US3660298A (en) * | 1969-11-19 | 1972-05-02 | Union Carbide Corp | Furnace charge for use in the production of silicon metal |
| CN1314498A (en) * | 2001-03-01 | 2001-09-26 | 李文联 | Process for making Al-Si alloy |
| CN1693519A (en) * | 2005-06-01 | 2005-11-09 | 苗怀胜 | Technology for producing silicon iron |
Non-Patent Citations (2)
| Title |
|---|
| 硅铁电炉内配碳团块的研究. 杨华明，邱冠周，潘晓.矿冶，第5卷,卷第4期. 1996 |
| 硅铁电炉内配碳团块的研究. 杨华明，邱冠周，潘晓.矿冶，第5卷,卷第4期. 1996 * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1844419A (en) | 2006-10-11 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN103708455B (en) | The method preparing carbide | |
| CN104556039B (en) | The method for preparing solid-state calcium carbide | |
| CN101787407B (en) | Method for reducing and extracting copper smelting waste slag through microwave carbon heating | |
| CN102225765A (en) | Mixed pellets composed of fine coal powder and limestone powder for producing calcium carbide | |
| CN105219907A (en) | The iron-smelting process of high-phosphor oolitic hematite gas base directly reducing-mill ore magnetic selection | |
| CN101736148A (en) | Sintering-pelletizing additive, preparation method and application thereof | |
| CN1804057A (en) | Method for making pellet by fine-grinded steel slag instead of bentonite | |
| CN103290158A (en) | Method for realizing dephosphorization of olitic high-phosphorus iron ore by use of biomass charcoal | |
| CN103451374A (en) | Production process of aluminium slag adjusting agent for LF refining furnace | |
| CN1861265B (en) | Ore-dressing process by using carbon-contg. block to reduce lean iron ore for prodn. of magnetite | |
| CN112591723A (en) | Method for producing powdered rock phosphate pellets by using low-grade powdered rock phosphate | |
| CN100507012C (en) | Producing process of directly reducing iron | |
| CN104355312B (en) | A kind of method utilizing waste gas to produce carbide | |
| CN113481346B (en) | Low-cost composite efficient heating agent for converter and preparation method thereof | |
| CN101413042B (en) | Slag-forming constituent and preparation thereof | |
| CN102653822A (en) | Iron-containing solid byproduct of iron making by smelting reduction and manufacturing method thereof | |
| CN1664120A (en) | Process for preparing slag by pelletization of steel-making dust slime | |
| CN101638703B (en) | Method for directly reducing nickel containing pig iron by lateritic nickel in tunnel kiln | |
| CN102452833B (en) | Carlin-type gold mine tailing sintered wall material and preparation method thereof | |
| CN100462451C (en) | Method of processing raw materials for production of ferrosilicon silicocalcium and high purity silicon | |
| CN103708459A (en) | Method for preparing calcium carbide | |
| CN115652083A (en) | Multi-stage air inlet soaking reduction method for iron-containing material | |
| CN205062100U (en) | Iron -smelting system of high phosphorus oolitic hematite gas base direct reduction - ore grinding magnetic separation | |
| CN111118238B (en) | Method for preparing steelmaking furnace burden by using blast furnace gas ash zinc extraction kiln slag | |
| CN1083406C (en) | High-strength self-ignited sintered flyash brick and its making process |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20090218 Termination date: 20110430 |