CN1128890C - Composite surficial additive for sinterred ore of blast furnace - Google Patents
Composite surficial additive for sinterred ore of blast furnace Download PDFInfo
- Publication number
- CN1128890C CN1128890C CN 01133382 CN01133382A CN1128890C CN 1128890 C CN1128890 C CN 1128890C CN 01133382 CN01133382 CN 01133382 CN 01133382 A CN01133382 A CN 01133382A CN 1128890 C CN1128890 C CN 1128890C
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- Prior art keywords
- additive
- composite
- surficial
- calcium chloride
- blast furnace
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Abstract
The present invention relates to a composite surficial additive for a sintered ore of a blast furnace, which belongs to the technical field of metallurgy. The composite surficial additive is prepared by uniformly mixing 0.05 to 0.3% of boric acid, 1.0 to 3.0% of calcium chloride and water as the rest, wherein the calcium chloride has more than 95% of purity and the boric acid is industrial pure. When the solution of the composite surficial additive of the present invention is sprayed to the surface of the sintering ore, the low temperature pulverization rate of sintered agglomerates in the blast furnace can be effectively reduced. Under the condition of the same pulverization rate of the sintering ore, the use of the composite surficial additive can lower 1/2 to 2/3 of chlorinity than the use of calcium chloride, the high temperature reduction property of the sintering ore can not be influenced, and production cost can not increase so that the composite surficial additive can replace the calcium chloride generally used at present.
Description
Affiliated technical field
The invention belongs to metallurgical technology field.
Background technology
The quality that helps improving blast furnace ironmaking with agglomerate ironmaking.But the blast furnace ironmaking agglomerate exists low temperature Pulverization ratio height, influences blast furnace permeability.For overcoming this problem, adopt the method for adding calcium chloride at agglomerate surface usually.Add the low temperature Pulverization ratio that calcium chloride can improve agglomerate significantly.But the use of calcium chloride has increased the content of chlorine in the blast furnace gas, has quickened gas recovery, refrigerating unit Corrosion of Metallic Materials.Magnesium chloride can substitute calcium chloride, reduces the usage quantity of additive, thereby reduces the content about 1/3 of chlorine, but can may cause alkali-metal introducing in blast furnace on the industrial production.
Summary of the invention
Increase the content of chlorine in the blast furnace gas for solving existing agglomerate surface additive, the problem of etchant gas recovery, refrigerating unit and don't introducing basic metal, the invention provides a kind of composite surficial additive for sinterred ore of blast furnace, can reduce blast furnace ironmaking agglomerate low temperature Pulverization ratio, the content that reduces chlorine does not simultaneously increase production cost more than 1/2.
The present invention is a raw material with common boric acid and calcium chloride, is mixed with flushing liquor by needed concentration proportioning, is sprayed at the agglomerate surface behind the sintering.
The compound surface additive consists of boric acid and calcium chloride.The ratio of boric acid and calcium chloride is B: Ca=1-2: 1 its content is boric acid 0.05%-0.3% (weight percent), and calcium chloride is 1.0%-3.0% (weight percent), and surplus is a water.Additive of the present invention adopts the general method uniform mixing to form, and at first dissolves boric acid during preparation in water, adds CaCl after half an hour
2Stir, can use.Used CaCl
2Purity is greater than 95%, and boric acid is technical pure.
Characteristics of the present invention are: utilize composite additive to improve the character of agglomerate surface, make agglomerate at low temperatures (＜500 ℃) installation for blast furnace gas is kept inertia and intensity, thereby reduce the low temperature Pulverization ratio of agglomerate.The compound surface additive does not exert an influence to agglomerate under high temperature (＞1000 ℃), and is identical when keeping agglomerate high temperature reduction rate and not using additive.Additive of the present invention does not contain smelts harmful element to iron, can not produce detrimental action to quality, State of Blast Furnace ore deposit and the refractory materials of iron, and the minimizing meeting of chlorine element consumption cools back receiving apparatus to blast furnace and installation for blast furnace gas and produces favourable influence.
Advantage of the present invention is:
1. can obviously reduce blast furnace sinter ore deposit low temperature Pulverization ratio;
2. it is over half to reduce the chlorine usage quantity.
3. additive is not introduced harmful element, does not influence the reductibility of agglomerate under the condition of high temperature, can guarantee the ordinary production of blast furnace;
4. composite additive is compared with the calcium chloride additive does not increase production cost.
Embodiment
Press general method mixed preparing additive of the present invention, make contained CaCl
2Concentration is 2.5%, H
3BO
3Concentration is 0.15%, and this compound surface additive solution is sprayed at agglomerate surface, measures the low temperature Pulverization ratio.The agglomerate that does not add additive, adding calcium chloride additive, adding composite additive carries out iron ore low temperature efflorescence test according to standard GB/T13242-91, and the gained Experiment Data Records sees Table 1.
Table 1 adds additive front and back agglomerate low temperature Pulverization ratio (RDI+3.15)
Doping does not add calcium chloride and adds composite additive low temperature Pulverization ratio＞35.0 22.5 21.8
Claims (2)
1. composite surficial additive for sinterred ore of blast furnace, what it is characterized in that this additive consists of boric acid and calcium chloride, calcium chloride purity is more than 95%, boric acid is technical pure, its content is boric acid 0.05%～0.3% (weight percent), calcium chloride 1.0～3.0% (weight percent), surplus are water, adopt the general method uniform mixing to form.
2. composite surficial additive for sinterred ore of blast furnace as claimed in claim 1 is characterized in that this additive the ratio of each component is boric acid: calcium chloride=1～2: 1, and concentration is boronic acid containing 0.15%, calcium chloride 2.5%.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 01133382 CN1128890C (en) | 2001-10-31 | 2001-10-31 | Composite surficial additive for sinterred ore of blast furnace |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 01133382 CN1128890C (en) | 2001-10-31 | 2001-10-31 | Composite surficial additive for sinterred ore of blast furnace |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1366085A CN1366085A (en) | 2002-08-28 |
| CN1128890C true CN1128890C (en) | 2003-11-26 |
Family
ID=4671765
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 01133382 Expired - Fee Related CN1128890C (en) | 2001-10-31 | 2001-10-31 | Composite surficial additive for sinterred ore of blast furnace |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1128890C (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1312299C (en) * | 2003-10-20 | 2007-04-25 | 孙挺 | Boron-calcium-magnesium compound agglomerate surface additive |
| CN1318609C (en) * | 2004-07-30 | 2007-05-30 | 孙挺 | Agglomerate surface additive for ironmaking |
| CN102234718B (en) * | 2010-04-23 | 2012-09-19 | 宝山钢铁股份有限公司 | Accessory ingredient for reducing low-temperature reduction powdering index of lump ore and use method thereof |
-
2001
- 2001-10-31 CN CN 01133382 patent/CN1128890C/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| CN1366085A (en) | 2002-08-28 |
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| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C06 | Publication | ||
| PB01 | Publication | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20031126 Termination date: 20161031 |