Electrode anti-oxidation coating_Henan_Luoyang Quantong Kiln Industry

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Electrode anti-oxidation coating

Luoyang Quantong Kiln Industry Co., Ltd. has produced 2 kinds of high-performance anti-oxidation coatings after long-term research and development and practice. Models FYHT-1 and FYHT-3.

The anti-oxidation coating is made of various micropowders and nanopowders and finely processed by adding inorganic and organic binders. FYHT-1 is specially used for electrolytic aluminum anode carbon blocks, and the anti-oxidation effect can be increased by more than 5 times. FYHT-3 is used for graphite electrodes, It has good electrical conductivity, and the anti-oxidation effect is increased by more than 10 times. It has a very significant effect on improving the service life of carbon-containing products.

grade	FYHT-1	FYHT-3
Operating temperature⁰C	Less than or equal to 1200	Less than or equal to 1650
Coating thickness mm	0.31	0.31
conductivity	non-conductive	Conductive
Application area	Electrolytic aluminum anode block, carbon products	graphite electrode
Effect	Antioxidant effect increased by more than 5 times	Antioxidant effect increased by more than 10 times
Economic Value	The life of the anode carbon block is increased by 610%, the electricity saving is 250,400kwh\/ton of aluminum, and the carbon slag is basically eliminated. The comprehensive cost is reduced by 550,650 yuan\/ton of aluminum. Reduce anode carbon block by 1.6 million tons and reduce electricity by 1.210¹⁰kwh, reduce CO₂The emission is about 9 million tons, and the comprehensive benefit is more than 20 billion yuan. And it needs about 0.3 percent or 48,000 tons of anti-oxidation coatings, with an output value of about 6 billion yuan.	Graphite electrode consumption is reduced by 1525 percent, and electrode cost is only increased by about 13 percent. For example: a steel company consumes 4kg of graphite electrodes per ton of steel. After the coating is used, the electrode consumption is reduced to 3.2kg\/ton of steel. The cost of steelmaking is reduced by 0.8kg40-2.6 (coating cost)=29.4 yuan\/ton of steel, and the economic benefits are significant. That is to invest one cost, produce more than ten benefits. At the same time reduce a lot of CO₂Displacement and social benefits are also significant.

Coating Features:

1. It has very good performance of protecting carbon products from oxidation, and the coating can effectively prevent oxidation;

2. The temperature range to prevent product oxidation is wide, generally at 1600⁰C below has better effect;

3. It is easy to use, and the paint is applied on the surface of carbon-containing products by spraying, brushing, dipping and other methods, and the brushing is uniform;

4. The coating has good adhesion, and it is not easy to produce peeling and peeling;

1. Apply the paint to the aluminum carbon immersion nozzle, magnesia carbon brick and carbon electrode respectively, with a coating thickness of about 1mm, and then conduct oxidation tests at different temperatures. The results are shown in the figure below.

5. The thermal deformation resistance is strong, the coating has good elasticity, and there is no crack or fall off at high temperature\/low temperature.

high qualityIntermediate frequency furnace ramming material, all through kiln production

Coating Construction:

1. Clean and remove the sundries and attachments on the surface of the carbon products to be painted.

2. After high-pressure spraying or brushing, use a rubber roller to compact.

3. According to different usage conditions, paint 1-2 times, and the thickness of the coating is 0.31mm.

Coating application:

It is used to prevent oxidation of graphite electrodes and carbon-containing products. By applying anti-oxidation coatings, the high-temperature oxidation problem of graphite electrodes and carbon-containing products can be completely solved, greatly prolonging the service time of graphite electrodes and carbon-containing products, and saving production costs of enterprises.

Oxidation test results

this is 1000⁰The result of C oxidation for 3h. The left is the case of commercial aluminum carbon immersion nozzle. The painted part forms a black glaze, and there is almost no oxidation, while the unpainted part is oxidized by as much as 6mm; the middle is the magnesia carbon brick, the painted part, There is almost no oxidation, the unpainted part, the decarburization layer reaches 3mm; the right side is the carbon anode, the unpainted part has oxidized a lot to 78mm, and the painted part has almost no oxidation.

2. After the graphite electrode side is coated with anti-oxidation paint, 900⁰C, oxidized for 6h, the painted part is basically not oxidized, and the unpainted part is oxidized into a gap.

The consumption of graphite electrodes used in steelmaking enterprises is shown in the following table:

Electric furnace type		Ordinary power electric furnace		High Power Electric Furnace		Ultra High Power Electric Furnace
raw material		scrap	Scrap steel plus molten iron	scrap	Scrap steel plus molten iron	scrap	Scrap steel plus molten iron
Steelmaking time h		46	24	34	22.5	12	0.61
electrode consumption	Ends	30 percent	40 percent	40 percent	45 percent	55 percent	55 percent
	Peripheral oxidation	60 percent	50 percent	50 percent	50 percent	35 percent	35 percent
	cut off	10 percent	510 percent	10 percent	5 percent	10 percent	10 percent
	Total consumption kg.t-1	57	34	33.5	23	23	12
The graphite electrode surface is coated with paint, and the oxidation rate is reduced by 80%. Therefore, the saving electrode consumption is
Saving electrode: kg.t-1		23	1.21.6	1.11.5	0.81.2	0.60.8	0.30.5
Amount of paint used: gt-1		13	7.6	7.1	5.5	4.2	2.5
Net cost reduction: Yuan.t-1		59.68	33.35	38.76	29.81	27.09	15.46

Remarks: The coating is 217 yuan\/kg;

The electrode price is as follows: ordinary power 25,000 yuan\/t, high power 31,000 yuan\/t, ultra-high power 40,000 yuan\/t.

LFRefining furnace
Steelmaking time h		0.5
electrode consumption	Ends	45 percent
	Peripheral oxidation	50 percent
	cut off	5 percent
	Total consumption kg.t-1	0.5
Saving electrode kg.t-1		0.2
The amount of paint used is gt-1		1.5
Net cost reduction yuan.t-1		4.67

Therefore, for an electric furnace steel enterprise with an annual output of 500,000 tons of steel (according to ultra-high power, no molten iron), the use of anti-oxidation coatings can reduce the cost by nearly 13.5 million yuan per year; for an ultra-high-power electric furnace with an annual output of 2 million tons of steel (According to the molten iron), the cost can be reduced by more than 30 million yuan\/year after the coating is used, and the benefits of the LF furnace have not been considered. For Baosteel's LF furnace using coatings, the cost of electrode consumption reduction is 150030% 4.67=21.015 million yuan\/year . Therefore, after Baosteel headquarters electric furnace and LF adopt anti-oxidation coating, the cost can be reduced by 50 million yuan per year, and the consumption of electrodes can be reduced by 1,400 tons. The price of graphite electrodes is now rising, which is more meaningful to reduce the consumption of graphite electrodes.

Construction Notes:

1. The surface temperature of the construction object is between 0 degrees Celsius and 60 degrees Celsius. It cannot be directly painted on objects with low temperature or high temperature. The painting method can be sprayed, brushed or dipped;

2. The coating film should be brushed evenly, the construction environment should be dry and ventilated, the temperature should be greater than 0 degrees Celsius, and the curing time of the coating should be greater than 24 hours;

3. The paint can only be painted on the surface of carbon-containing products. If the surface of the object is covered with sundries such as oil, rust, dust and organic substances, it is necessary to remove the sundries and then apply the paint.

4. Sealed and stored. Within the validity period, there may be precipitation when opening and using, you can stir it evenly before use.