CN1041406C - Method and equipment for prodn. of continuous casting protective slag material by tower furnace - Google Patents
Method and equipment for prodn. of continuous casting protective slag material by tower furnace Download PDFInfo
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- CN1041406C CN1041406C CN97116724A CN97116724A CN1041406C CN 1041406 C CN1041406 C CN 1041406C CN 97116724 A CN97116724 A CN 97116724A CN 97116724 A CN97116724 A CN 97116724A CN 1041406 C CN1041406 C CN 1041406C
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Abstract
The present invention relates to a method and a device for directly melting ore in a vertical furnace so as to produce continuous casting protective slag base materials. A pre-melting belt 3 and a melting belt 6 of the vertical furnace of the present invention are not provided with a refractory lining, a water cooling device is arranged at the outer side, and three rows of air ports with different air blowing directions are arranged on a furnace shell 10 of the juncture of the pre-melting belt 13 and the melting belt 6. The method of the present invention comprises the following steps that ore materials comprising limestone, quartz stones, etc. are mixed and prepared in proportion and then are thrown in the vertical furnace from a feed inlet 9, coke is used as fuel, the air quantity and the air pressure are adjusted correctly so as to control a temperature in the furnace, and melted product can pass through water quenching and dewatering. The present invention has the advantages of device saving, low cost and stable product quality.
Description
The present invention relates to a kind of with ore directly in shaft furnace fusion with the method for producing the continuous casting covering slag base-material and used equipment thereof.This method and apparatus is particularly useful for producing continuous casting of iron and steel covering slag base-material.
The prior continuous casting protective slag base-material adopts electric furnace production substantially.But the furnace equipment investment is big, the electric energy of consumes expensive, cost height, and the electrosmelting raw material must be through pulverizing, stirring, and majority also need be made ball, roasting, therefore raw ore will be pulverized the molecule that make less than 10mm, complex process also needs corresponding the pulverizing or balling equipment; In addition, electric furnace is to add behind the honest material once to melt, and is to concentrate to slag tap when slagging tap, and concentrates shrend, causes product to be difficult to vitrifying owing to how circuitous material water cooling be bad, and yield poorly can not continuous production.
For this reason, the invention provides a kind of method and apparatus of producing the continuous casting covering slag base-material with shaft furnace.The present invention directly drops into fusion in the shaft furnace with raw ore, the technical process of electrosmelting is used in the pulverizing that replacement is used at present both at home and abroad → stir → make ball → roasting at last, thereby reduces operation, save many equipment, and reduce power consumption, production cost is reduced greatly.
The object of the present invention is achieved like this:
Shaft furnace equipment of the present invention comprises: opening for feed and the preheating zone that is provided with furnace lining that is attached thereto, and the fritting band and the melting zone that link to each other with described preheating zone, described fritting band and melting zone place do not establish refractorily lined, and be provided with water cooling equipment in its outside, on the furnace shell of described fritting band and melting zone intersection, be provided with three row's blast orifices, wherein, in the plane that the longitudinal axis constituted of the medullary ray in described air port and described shaft furnace, going up most the air supply direction of an exhaust outlet and the angle of described longitudinal axis formation is 30～35 degree, the angle that the air supply direction of a middle exhaust outlet and the described longitudinal axis constitute is 90 degree, the angle that constitutes of the air supply direction of next exhaust outlet and the described longitudinal axis is 145～150 degree, is provided with slag notch in the bottom of described shaft furnace.
Described water cooling equipment can be annular conduit (being the rain showering curtain type) on the outside, furnace wall that is located at described preheating zone, that have the downward spout hole that evenly separates; Described water cooling equipment also can be the watercooling jacket on the outside, furnace wall that is located at described fritting band and melting zone.
Method of the present invention is:
Adopt the method for the production continuous casting covering slag base-material that above-mentioned shaft furnace equipment carries out, the steps include:
To comprise Wingdale; the ore that quartzite etc. are used for making the continuous casting covering slag base-material in proportion the compound that forms of batch mixes and coke in batches order add shaft furnace through the shaft furnace opening for feed; described compound is 1: 2.5～3 with the ratio of described coke; sending into air by described blast orifice burns described coke successively; adjust air quantity; blast is so that the temperature of the preheating zone of described shaft furnace is 900～1100 ℃; the temperature of fritting band is 1350～1400 ℃; the temperature of melting zone is 1420～1460 ℃; the temperature of slag notch is 1360～1410 ℃; thereby make described compound in the preheating zone preheating; in the fritting of fritting band; melt at melting zone; after slag notch flow out, through shrend; dehydration; dry and obtain described covering slag base-material.
The described ash content that is used as the coke of fuel should be less than 20%.
Describe the present invention below in conjunction with accompanying drawing:
Fig. 1 is the shaft furnace that adopts the rain showering curtain type that the sidewall of not establishing refractorily lined is cooled among the present invention.
Fig. 2 is the shaft furnace that adopts water-jacket typ that the sidewall of not establishing refractorily lined is cooled among the present invention.
Among the figure: 1-furnace lining, 2-are used to spray the water pipe of water curtain, 3-preheating zone, 4-wind band, 5-air outlet, the 6-melting zone, 7-slag notch, 8-bottom refractory, 9-opening for feed, 10-furnace shell (Plate Steel formation), the 11-watercooling jacket, 12-water jacket water-in, 13-fritting band, the 14-shaft furnace longitudinal axis.
Shaft furnace equipment of the present invention comprises: charging aperture 9 and the preheating zone that is provided with furnace lining 3 that is attached thereto, And the fritting band 13 and the fusion zone 6 that link to each other with described preheating zone 3, described fritting band 13 and fusion zone 6 places do not establish refractory lining, and are provided with water cooling equipment in its outside, in described fritting band 13 and fusing Furnace shell 10 with 6 intersections is provided with three row's blast orifices 5, wherein, and center line and institute in described air port State in the plane that the longitudinal axis 14 of shaft furnace consists of, go up air supply direction and the described longitudinal axis 14 of an exhaust outlet most The angle [alpha] that consists of is 30～35 degree, and the air supply direction of a middle exhaust outlet and the described longitudinal axis 14 consist of Angle is 90 degree, and the air supply direction in next row air port with the angle beta of the described longitudinal axis 14 formations is 145～150 degree are provided with slag notch 7 in the bottom of described shaft furnace.
Described water cooling equipment can adopt on as shown in Figure 1 the furnace wall outside that is located at described preheating zone 3 , with the annular conduit 2 of the downward hole for water spraying that evenly separates or shown in Figure 2 be located at described fritting With 13 and the outside, the furnace wall of fusion zone 6 on cooling jacket 11.
The present invention adopts the method for the production continuous casting covering slag base-material that above-mentioned shaft furnace carries out, and the steps include:
To comprise that lime stone, quartz etc. are for the manufacture of the ore of continuous casting covering slag base-material in proportion Batching is mixed rear and coke adds in the shaft furnaces described compound and described Jiao in batches in proper order through charging aperture 9 The ratio of charcoal is 1: 2.5～3, sends into air by described blast orifice 5 described coke burnt successively, Adjust air quantity, blast so that the temperature of the preheating zone 3 of shaft furnace is 900～1100 ℃, the temperature of fritting band 13 Degree is 1350～1400 ℃, and the temperature of fusion zone 6 is 1420～1460 ℃, and the temperature of slag notch 7 is 1360～1410 ℃, thus make 3 preheatings in the preheating zone of described compound, 13 fritting of fritting band, Fusion zone 6 fusing, flow out finally by slag notch 7, obtain described guarantor through shrend, dehydration, drying Protect the slag base-material.
The described ash content that is used as the coke of fuel should be less than 20%.
The content of calcium oxide is more than 50% in the described lime stone, silica in the described quartz Content more than 90%, described lime stone and quartz granularity are 2～10cm.
The present invention has following advantage:
The present invention directly drops into melting in the shaft furnace with raw ore, replaces the pulverizing of using at present both at home and abroad → stir → make ball → roasting, use at last the technological process of electro-smelting, thereby reduce operation, save Many equipment, and reduce power consumption, production cost is reduced greatly, and constant product quality.
At different ores, the covering slag base-material that the inventive method production heterogeneity requires is adopted in explanation in conjunction with the embodiments below:
1, raw material is Wingdale and quartzite, and its proportioning (weight part) is:
Wingdale: quartzite=1.5～4.0: 1.5～1.75
The steps include: with proportioning raw materials (weight part) to be 1.5～4.0: 1.5～1.75 Wingdale; quartzite compound and coke order in batches add in the shaft furnace through opening for feed 9; described compound is 1: 2.5～3 with the ratio of described coke; sending into air by described blast orifice 5 burns described coke successively; adjust air quantity; blast is so that the temperature of the preheating zone 3 of shaft furnace is 900～1100 ℃; the temperature of fritting band 13 is 1350～1400 ℃; the temperature of melting zone 6 is 1420～1460 ℃; the temperature of slag notch 7 is 1360～1410 ℃; thereby make 3 preheatings of described compound in the preheating zone; in 13 fritting of fritting band; in melting zone 6 fusings; after slag notch 7 flow out, through shrend; dehydration; dry and obtain described covering slag base-material.
The content of calcium oxide is more than 50% in the described Wingdale, and the content of silicon-dioxide is more than 90% in the described quartzite, and described Wingdale and quartzite granularity are 2～10cm, and the ash of described coke as fuel is less than 20%.
2, raw material is a Wingdale. quartzite and fluorite, and its proportioning (weight part) is:
Wingdale: quartzite: fluorite=2.0～4.0: 1.5～1.75: 0.38～1.0
The steps include: that with proportioning raw materials (weight part) be 2.0～4.0: 1.5～1.75: 0.38～1.0 Wingdale; quartzite; fluorite compound and coke order in batches add in the shaft furnace through opening for feed 9; described compound is 1: 2.5～3 with the ratio of described coke; sending into air by described blast orifice 5 burns described coke successively; adjust air quantity; blast is so that the temperature of the preheating zone 3 of shaft furnace is 900～1100 ℃; the temperature of fritting band 13 is 1350～1400 ℃; the temperature of melting zone 6 is 1420～1460 ℃; the temperature of slag notch 7 is 1360～1410 ℃; thereby make 3 preheatings of described compound in the preheating zone; in 13 fritting of fritting band; in melting zone 6 fusings; after slag notch 7 flow out, through shrend; dehydration; dry and obtain described covering slag base-material.
The content of calcium oxide is more than 50% in the described Wingdale, the content of silicon-dioxide is more than 90% in the described quartzite, Calcium Fluoride (Fluorspan) content in the described fluorite is more than 80%, described Wingdale and quartzite granularity are 2～10cm, described fluorite granularity is 2～8cm, and the ash of described coke as fuel is less than 20%.
3, contain Lithium Oxide 98min in the covering slag base-material
Raw material is Wingdale, quartzite, fluorite and Quilonum Retard, and its proportioning (weight part) is:
Wingdale: quartzite: fluorite: Quilonum Retard=1.5～4.0: 1.5～1.75:
0～1.0∶0.025～0.35
The steps include: that with proportioning raw materials (weight part) be 1.5～4.0: 1.5～1.75: 0～1.0: 0.025～0.35 Wingdale; quartzite; fluorite; Quilonum Retard compound and coke order in batches add in the shaft furnace through opening for feed 9; described compound is 1: 2.5～3 with the ratio of described coke; sending into air by described blast orifice 5 burns described coke successively; adjust air quantity; blast is so that the temperature of the preheating zone 3 of shaft furnace is 900～1100 ℃; the temperature of fritting band (13) is 1350～1400 ℃; the temperature of melting zone 6 is 1420～1460 ℃; the temperature of slag notch 7 is 1360～1410 ℃; thereby make 3 preheatings of described compound in the preheating zone; in 13 fritting of fritting band; in melting zone 6 fusings; after slag notch 7 flow out, through shrend; dehydration; dry and obtain described covering slag base-material.
The content of calcium oxide is more than 50% in the described Wingdale, the content of silicon-dioxide is more than 90% in the described quartzite, Calcium Fluoride (Fluorspan) content in the described fluorite is more than 80%, described Wingdale and quartzite granularity are 2～10cm, described fluorite granularity is 2～8cm, described Quilonum Retard is an industrial chemicals, and the ash of described coke as fuel is less than 20%.
4, contain sodium oxide in the covering slag base-material
Raw material is Wingdale, quartzite, fluorite and water glass, and its proportioning (weight part) is:
Wingdale: quartzite: fluorite: water glass=1.5～4.0: 1.5～1.75:
0～1.0∶0.01～1.22
The steps include: that with proportioning raw materials (weight part) be 1.5～4.0: 1.5～1.75: 0～1.0: 0.01～1.22 Wingdale; quartzite; fluorite; water glass compound and coke order in batches add in the shaft furnace through opening for feed 9; described compound is 1: 2.5～3 with the ratio of described coke; sending into air by described blast orifice 5 burns described coke successively; adjust air quantity; blast is so that the temperature of the preheating zone 3 of shaft furnace is 900～1100 ℃; the temperature of fritting band 13 is 1350～1400 ℃; the temperature of melting zone 6 is 1420～1460 ℃; the temperature of slag notch 7 is 1360～1410 ℃; thereby make 3 preheatings of described compound in the preheating zone; in 13 fritting of fritting band; in melting zone 6 fusings; after slag notch 7 flow out, through shrend; dehydration; dry and obtain described covering slag base-material.
The content of calcium oxide is more than 50% in the described Wingdale, the content of silicon-dioxide is more than 90% in the described quartzite, Calcium Fluoride (Fluorspan) content in the described fluorite is more than 80%, described Wingdale and quartzite granularity are 2～10cm, described fluorite granularity is 2～8cm, described water glass is an industrial chemicals, and the ash of described coke as fuel is less than 20%.Embodiment 1:
In 3 tons of shaft furnaces, to add proportioning be Wingdale to order in batches: the compound and the coke of quartzite=2: 1.6, and coke ratio is 1: 2.8, the blast orifice α of described shaft furnace is that 33 °, β are 147 °, is 80～100m by the control air quantity
3/ minute, blast is 1.5～2 * 10
5Handkerchief, so that the temperature of this shaft furnace preheating zone 3 is 900～1100 ℃, the temperature of fritting band 13 is 1350～1400 ℃, the temperature of melting zone 6 is 1420～1460 ℃, the temperature of slag notch 7 is 1360～1410 ℃, every batch of material is the coke of 400 kilograms of compounds and respective numbers, every discharging in 30～40 minutes once.The main chemical of the covering slag base-material of gained is:
SiO
2 50.40％ CaO?43.25％ Al
2O
3 2.96％
Fe
2O
30.41% MgO, 1.00% embodiment 2:
In 3 tons of shaft furnaces, to add proportioning be Wingdale to order: quartzite in batches: the compound and the coke of fluorite=2.0: 1.5: 0.38, and coke ratio is 1: 3, the blast orifice α of described shaft furnace is that 33 °, β are 147 °, is 80～100m by the control air quantity
3/ minute, blast is 1.5～2 * 10
5Handkerchief, so that the temperature of this shaft furnace preheating zone 3 is 900～1100 ℃, the temperature of fritting band 13 is 1350～1400 ℃, the temperature of melting zone 6 is 1420～1460 ℃, the temperature of slag notch 7 is 1360～1410 ℃, every batch of material is the coke of 400 kilograms of compounds and respective numbers, every discharging in 30～40 minutes once.The main chemical of the covering slag base-material of gained is:
SiO
2 38.16％ CaO 52.78％ Al
2O
3 2.78％
Fe
2O
30.28% MgO, 1.06% F, 4.56% embodiment 3:
In 3 tons of shaft furnaces, add proportioning in proper order is Wingdale in batches: quartzite: fluorite: Quilonum Retard=4.0: 1.75: 0.25: 0.12 compound and coke, coke ratio is 1: 2.8, and the blast orifice α of described shaft furnace is that 35 °, β are 145 °, is 80～100m by the control air quantity
3/ minute, blast is 1.5～2 * 10
5Handkerchief, so that the temperature of this shaft furnace preheating zone 3 is 900～1100 ℃, the temperature of fritting band 13 is 1350～1400 ℃, the temperature of melting zone 6 is 1420～1460 ℃, the temperature of slag notch 7 is 1360～1410 ℃, every batch of material is the coke of 400 kilograms of compounds and respective numbers, every discharging in 30～40 minutes once.The main chemical of the covering slag base-material of gained is:
SiO
2?38.65％ CaO?49.46％ Al
2O
3?2.95％ Fe
2O
3?0.5％
MgO 1.0% F 4.0% Li
2O 3.0% embodiment 4:
In 3 tons of shaft furnaces, add proportioning in proper order is Wingdale in batches: quartzite: fluorite: water glass=2.0: 1.64: 0.32: 0.05 compound and coke, coke ratio is 1: 2.9, and the blast orifice α of described shaft furnace is that 35 °, β are 145 °, is 80～100m by the control air quantity
3/ minute, blast is 1.5～2 * 10
5Handkerchief, so that the temperature of this shaft furnace preheating zone 3 is 900～1100 ℃, the temperature of fritting band 13 is 1350～1400 ℃, the temperature of melting zone 6 is 1420～1460 ℃, the temperature of slag notch 7 is 1360～1410 ℃, every batch of material is the coke of 400 kilograms of compounds and respective numbers, every discharging in 30～40 minutes once.The main chemical of the covering slag base-material of gained is:
SiO
2 42.25％ CaO 47.25％ Al
2O
3 2.95％ Fe
2O
3 0.35％
MgO 1.10％ F 4.30％ Na
2O 1.5％
Claims (9)
1; a kind of shaft furnace equipment that is used to produce the continuous casting covering slag base-material; it is characterized in that the preheating zone that is provided with furnace lining (3) that described shaft furnace equipment comprises opening for feed (9) and is attached thereto; and the fritting band (13) and the melting zone (6) that link to each other with described preheating zone (3); described fritting band (13) and melting zone (6) locate not establish refractorily lined; and be provided with water cooling equipment in its outside; on the furnace shell (10) of described fritting band (13) and melting zone (6) intersection, be provided with three row's blast orifices (5); wherein; in the plane that the medullary ray in described air port and the longitudinal axis of described shaft furnace (14) are constituted; going up most the air supply direction of an exhaust outlet and the angle of the described longitudinal axis (14) formation is 30～35 degree; the angle that the air supply direction of a middle exhaust outlet and the described longitudinal axis (14) constitute is 90 degree; the angle that constitutes of the air supply direction of next exhaust outlet and the described longitudinal axis (14) is 145～150 degree, is provided with slag notch (7) in the bottom of described shaft furnace.
2, shaft furnace equipment as claimed in claim 1 is characterized in that described water cooling equipment is annular conduit (2) on the outside, furnace wall that is located at described preheating zone (3), that have the downward spout hole that evenly separates.
3, shaft furnace equipment as claimed in claim 1 is characterized in that described water cooling equipment is the watercooling jacket (11) on the outside, furnace wall that is located at described fritting band (13) and melting zone (6).
4; adopt the method for the production continuous casting covering slag base-material that each equipment carries out in the claim 1～3; the steps include: proportioning raw materials (weight part) is (1.5～4.0): the Wingdale of (1.5～1.75); quartzite compound and coke order in batches add in the shaft furnace through opening for feed (9); described compound is 1: 2.5～3 with the ratio of described coke; sending into air by described blast orifice (5) burns described coke successively; adjust air quantity; blast is so that the temperature of the preheating zone of shaft furnace (3) is 900～1100 ℃; the temperature of fritting band (13) is 1350～1400 ℃; the temperature of melting zone (6) is 1420～1460 ℃; the temperature of slag notch (7) is 1360～1410 ℃; thereby make (3) preheating of described compound in the preheating zone; in fritting band (13) fritting; melt at melting zone (6); after slag notch (7) flow out; through shrend; dehydration; dry and obtain described covering slag base-material; the content of calcium oxide is more than 50% in the described Wingdale; the content of silicon-dioxide is more than 90% in the described quartzite, and described Wingdale and quartzite granularity are 2～10cm.
5; adopt the method for the production continuous casting covering slag base-material that each equipment carries out in the claim 1～3; the steps include: proportioning raw materials (weight part) is (2.0～4.0): (1.5～1.75): the Wingdale of (0.38～1.0); quartzite; fluorite compound and coke order in batches add in the shaft furnace through opening for feed (9); described compound is 1: 2.5～3 with the ratio of described coke; sending into air by described blast orifice (5) burns described coke successively; adjust air quantity; blast is so that the temperature of the preheating zone of shaft furnace (3) is 900～1100 ℃; the temperature of fritting band (13) is 1350～1400 ℃; the temperature of melting zone (6) is 1420～1460 ℃; the temperature of slag notch (7) is 1360～1410 ℃; thereby make (3) preheating of described compound in the preheating zone; in fritting band (13) fritting; melt at melting zone (6); after slag notch (7) flow out; through shrend; dehydration; dry and obtain described covering slag base-material; the content of calcium oxide is more than 50% in the described Wingdale; the content of silicon-dioxide is more than 90% in the described quartzite; Calcium Fluoride (Fluorspan) content in the described fluorite is more than 80%; described Wingdale and quartzite granularity are 2～10cm, and described fluorite granularity is 2～8cm.
6, adopt the method for the production continuous casting covering slag base-material that each equipment carries out in the claim 1～3; the steps include: proportioning raw materials (weight part) to (1.5～4.0): (1.5～1.75): (0～1.0): the Wingdale of (0.025～0.35), quartzite, fluorite, Quilonum Retard compound and coke order in batches add in the shaft furnace through opening for feed (9), the ratio of described compound and described coke be 1: 2.5～
3; sending into air by described blast orifice (5) burns described coke successively; adjust air quantity; blast is so that the temperature of the preheating zone of shaft furnace (3) is 900～1100 ℃; the temperature of fritting band (13) is 1350～1400 ℃; the temperature of melting zone (6) is 1420～1460 ℃; the temperature of slag notch (7) is 1360～1410 ℃; thereby make (3) preheating of described compound in the preheating zone; in fritting band (13) fritting; melt at melting zone (6); after slag notch (7) flow out; through shrend; dehydration; dry and obtain described covering slag base-material; the content of calcium oxide is more than 50% in the described Wingdale; the content of silicon-dioxide is more than 90% in the described quartzite; Calcium Fluoride (Fluorspan) content in the described fluorite is more than 80%; described Wingdale and quartzite granularity are 2～10cm; described fluorite granularity is 2～8cm, and described Quilonum Retard is an industrial chemicals.
7; adopt the method for the production continuous casting covering slag base-material that each equipment carries out in the claim 1～3; the steps include: proportioning raw materials (weight part) is (1.5～4.0): (1.5～1.75): (0～1.0): the Wingdale of (0.01～1.22); quartzite; fluorite; water glass compound and coke order in batches add in the shaft furnace through opening for feed (9); described compound is 1: 2.5～3 with the ratio of described coke; sending into air by described blast orifice (5) burns described coke successively; adjust air quantity; blast is so that the temperature of the preheating zone of shaft furnace (3) is 900～1100 ℃; the temperature of fritting band (13) is 1350～1400 ℃; the temperature of melting zone (6) is 1420～1460 ℃; the temperature of slag notch (7) is 1360～1410 ℃; thereby make (3) preheating of described compound in the preheating zone; in fritting band (13) fritting; melt at melting zone (6); after slag notch (7) flow out; through shrend; dehydration; dry and obtain described covering slag base-material; the content of calcium oxide is more than 50% in the described Wingdale; the content of silicon-dioxide is more than 90% in the described quartzite; Calcium Fluoride (Fluorspan) content in the described fluorite is more than 80%; described Wingdale and quartzite granularity are 2～10cm; described fluorite granularity is 2～8cm, and described water glass is an industrial chemicals.
8, as each described method in the claim 4～7, the ash of wherein said coke as fuel is less than 20%.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN97116724A CN1041406C (en) | 1997-08-05 | 1997-08-05 | Method and equipment for prodn. of continuous casting protective slag material by tower furnace |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN97116724A CN1041406C (en) | 1997-08-05 | 1997-08-05 | Method and equipment for prodn. of continuous casting protective slag material by tower furnace |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1176858A CN1176858A (en) | 1998-03-25 |
| CN1041406C true CN1041406C (en) | 1998-12-30 |
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ID=5174052
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN97116724A Expired - Fee Related CN1041406C (en) | 1997-08-05 | 1997-08-05 | Method and equipment for prodn. of continuous casting protective slag material by tower furnace |
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| Country | Link |
|---|---|
| CN (1) | CN1041406C (en) |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1099007A (en) * | 1994-05-06 | 1995-02-22 | 郭建华 | Recipe and technique for artificial tabular spar |
| CN1123256A (en) * | 1995-08-25 | 1996-05-29 | 郭健华 | Protective-dregs base-material of artificial wollastonite and producing technology thereof |
-
1997
- 1997-08-05 CN CN97116724A patent/CN1041406C/en not_active Expired - Fee Related
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1099007A (en) * | 1994-05-06 | 1995-02-22 | 郭建华 | Recipe and technique for artificial tabular spar |
| CN1123256A (en) * | 1995-08-25 | 1996-05-29 | 郭健华 | Protective-dregs base-material of artificial wollastonite and producing technology thereof |
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| Publication number | Publication date |
|---|---|
| CN1176858A (en) | 1998-03-25 |
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