Fluoride-free covering slag used for high-aluminum steel continuous casting crystallization device
What is Al technical title?
Al technical title is built by PatSnap Al team. It summarizes the technical point description of the patent document.
A technology of mold slag and high aluminum steel, which is applied in the field of iron and steel smelting and continuous casting, can solve the problems of workers' health damage, water pollution, equipment corrosion, etc., and achieve the effect of reasonable component matching, avoiding pollution and improving lubrication effect
Active Publication Date: 2017-10-27
CENT SOUTH UNIV
View PDF7 Cites 6 Cited by
Summary
Abstract
Description
Claims
Application Information
AI Technical Summary
This helps you quickly interpret patents by identifying the three key elements:
Problems solved by technology
Method used
Benefits of technology
Problems solved by technology
However, the fluorine-containing mold flux will cause the following three problems in the continuous casting process: 1) Fluorine will react during the melting process of the mold flux to form harmful fluorides with low melting points (HF, SiF 4 , NaF, etc.), causing corrosion of equipment and damage to the health of workers; 2) In contact with cold water during the cycle, fluorine will be released into the water, causing the water sample to be acidic, causing water pollution and equipment corrosion; 3) Fluorine will also be released into the soil during the stacking of waste residue after use, causing soil and groundwater pollution
Method used
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more
Image
Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
Click on the blue label to locate the original text in one second.
Reading with bidirectional positioning of images and text.
Smart Image
Examples
Experimental program
Comparison scheme
Effect test
Embodiment 1
[0042] Ingredients: ternary alkalinity CaO / (SiO 2 +Al 2 o 3 ) is 1.10, CaO 41.90wt.%, SiO 2 10wt.%, Al 2 o 3 28.10wt.%, MgO 2wt.%, Na 2 O 10wt.%, Li 2 O 2wt.%, B 2 o 3 6wt.%.
[0043] Preparation process: Weigh the above-mentioned mold slag raw materials according to the target components, and perform mechanical stirring to make the components evenly mixed, and then use an intermediate frequency induction furnace to heat and melt the mixed samples to remove volatiles and gas substances, and form complex Solid solution, the molten slag is poured into water and quenched to obtain a glassy mold slag block, and the mold slag block is mechanically crushed and ground to obtain the required mold slag powder.
[0044] The main physical properties of mold flux are shown in Table 1.
Embodiment 2
[0046] Ingredients: ternary alkalinity CaO / (SiO 2 +Al 2 o 3 ) is 1.10, CaO 40.86wt.%, SiO 2 10wt.%, Al 2 o 3 27.14wt.%, MgO 2wt.%, Na 2 O 10wt.%, Li 2 O 2wt.%, B 2 o 3 8wt.%.
[0047] Preparation process: with embodiment 1.
[0048] The main physical properties of mold flux are shown in Table 1.
Embodiment 3
[0050] Ingredients: ternary alkalinity CaO / (SiO 2 +Al 2 o 3 ) is 1.10, CaO 39.81wt.%, SiO 2 10wt.%, Al 2 o 3 26.19wt.%, MgO 2wt.%, Na 2 O 10wt.%, Li 2 O 2wt.%, B 2 o 3 10 wt.%.
[0051] Preparation process: with embodiment 1.
[0052] The main physical properties of mold flux are shown in Table 1.
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more
PUM
Property
Measurement
Unit
viscosity
aaaaa
aaaaa
Login to view more
Abstract
The invention relates to fluoride-free covering slag used for a high-aluminum steel continuous casting crystallization device. The covering slag is composed of, by mass, oxide components of 30-45% of CaO, 10-25% of SiO2, 20-35% of Al2O3, 2-10% of MgO, 4-10% of B2O3, 8-15% of Na2O+Li2O, CaO / (SiO2+Al2O3) larger than or equal to 1.1 but smaller than or equal to 1.3, CaO / B2O3 larger than or equal to 3.5 but smaller than or equal to 7 and SiO2 / B2O3 larger than or equal to 1 but smaller than or equal to 1.7. Scrap steel in the covering slag is low in reaction degree, crystallization performance is good, and the crystallization ore phase is mainly calcium borate silicate. The formed calcium borate silicate can fix SiO2 in covering slag melt, reaction between SiO2 and an Al element in steel is weakened from reaction kinetics, and the stability of the covering slag is greatly improved; the calcium borate silicate crystals can effectively control the heat-transfer effect of the covering slag.
Description
technical field [0001] The invention belongs to the field of iron and steel smelting and continuous casting, and relates to a high-aluminum steel fluorine-free protective slag with good physical and chemical properties. Background technique [0002] Continuous casting mold powder has many important functions in the continuous casting process, such as preventing oxidation, absorbing inclusions, lubricating the billet shell and controlling heat transfer, among which the functions of lubrication and heat transfer are the most important. The smooth progress of casting plays an important role. In the continuous casting process of high aluminum steel, Al in molten steel will enter into the mold flux in two different ways, one is absorbed into the mold flux in the form of non-metallic oxide inclusions, oxygen is preferentially combined with Al, Generate metal oxide inclusions; the other is through SiO in mold flux 2 The reaction occurs (4[Al]+3(SiO 2 )=2(Al 2 o 3 )+3[Si]) into...
Claims
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more
Application Information
Patent Timeline
Application Date:The date an application was filed.
Publication Date:The date a patent or application was officially published.
First Publication Date:The earliest publication date of a patent with the same application number.
Issue Date:Publication date of the patent grant document.
PCT Entry Date:The Entry date of PCT National Phase.
Estimated Expiry Date:The statutory expiry date of a patent right according to the Patent Law, and it is the longest term of protection that the patent right can achieve without the termination of the patent right due to other reasons(Term extension factor has been taken into account ).
Invalid Date:Actual expiry date is based on effective date or publication date of legal transaction data of invalid patent.
Login to view more