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Temperature Control Method of MgO Coating Solution for Oriented Silicon Steel

A technology of oriented silicon steel and control method, which is applied in heat treatment process control, manufacturing tools, heat treatment equipment, etc., can solve problems such as troublesome production, narrow temperature range of coating liquid, unstable temperature of magnesium oxide solution, etc., so as to save production cost and prevent The effect of quality deterioration

Active Publication Date: 2020-02-07
武汉钢铁有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In the existing magnesium oxide coating system, the coating liquid is prepared in the liquid distribution tank, and then added to the circulation tank through relevant pipelines to supplement the circulation tank. The coating liquid is sprayed onto the coating roller through the spray pipe and coated on the steel strip. , the coating liquid on the coating is lost, and the uncoated coating liquid is returned to the circulation tank through the return pipe to continue to be used; for the temperature of the coating liquid in the liquid distribution tank and the circulation tank, the method of manually controlling the valve of the refrigerator is adopted. However, Because the coating liquid has a process of returning to the circulation tank, the temperature of the returning part of the coating liquid is relatively high, so the cooling demand of the circulation tank is greater than that of the liquid distribution tank; if only the cooling requirements of the liquid distribution tank are met, the cooling requirements of the circulation tank cannot be met. If the cooling requirements of the circulation tank are met, there will be a risk of excessive cooling of the liquid distribution tank. Therefore, there is no way for a unified temperature control system to ensure the cooling requirements of the liquid distribution tank and the circulation tank at the same time, which will easily cause the temperature of the magnesium oxide solution in the circulation tank to be unstable. The temperature range of the suitable coating solution for production is very narrow, and on the other hand, it is easy to cause the outer wall of the cooling pipe in the liquid distribution tank to freeze, which brings unnecessary troubles to the actual production

Method used

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  • Temperature Control Method of MgO Coating Solution for Oriented Silicon Steel

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] In summer, turn on the refrigerator 3 and set its temperature to -5~0℃, adjust the opening degree of the first temperature regulating valve 4 to realize the temperature control of the liquid distribution tank 1 to 0~10℃, and adjust the second temperature The opening of the valve 5 realizes that the temperature of the circulation tank 2 is controlled to be 5-10°C. At the same time, this embodiment preferably mixes 300kg of magnesium oxide powder, 2500kg of water, and 15kg of additives, and controls the stirring speed to be 200-800 per minute. Then, the magnesium oxide coating solution was prepared by stirring for more than 1.5 hours, until the surface coating of the oriented silicon steel was finished, and the dried magnesium oxide powder after coating was taken to measure the moisture content. The moisture content of the silicon steel sheet was determined to be 1.93%.

Embodiment 2

[0031] In winter, turn on the refrigerator 3 and set its temperature to -2~3℃, adjust the opening degree of the first temperature regulating valve 4 to realize the temperature control of the liquid distribution tank 1 to 0~10℃, and adjust the second temperature regulation The opening of the valve 5 realizes that the temperature of the circulation tank 2 is controlled to be 5-10°C. At the same time, this embodiment preferably mixes 300kg of magnesium oxide powder, 2500kg of water, and 15kg of additives, and controls the stirring speed to be 300~ per minute. 800 rpm, stirring for more than 1.5 hours to prepare a magnesium oxide coating solution, until the surface coating of the oriented silicon steel is completed, the dried magnesium oxide powder after coating is taken for moisture content measurement. The moisture content of the silicon steel sheet was determined to be 1.72%.

Embodiment 3

[0033] Turn on the refrigerator 3 and set its temperature to -10~0℃, the temperature of the liquid distribution tank 1 is actually -2~5℃, the temperature setting of the circulation tank 2 is achieved by adjusting the opening of the second temperature regulating valve 5 At the same time, this embodiment preferably mixes 300kg of magnesium oxide powder, 2500kg of water, and 15kg of additives, controls the stirring speed to be 300-800 revolutions per minute, and stirs for more than 1.5 hours to prepare the magnesium oxide coating solution , To the end of the surface coating of the oriented silicon steel, take the dried magnesium oxide powder after coating to measure the moisture content. The moisture content of the silicon steel sheet was determined to be 3.6%; in addition, when the temperature of the mixing tank was lower than 0°C, the cooling of the inner wall would cause the pipeline to freeze, which would make the magnesium oxide coating liquid stir unevenly and scale and also ...

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Abstract

The invention discloses a control method of magnesium oxide coating temperature of grain-oriented silicon steel, and belongs to the technical field of metallurgy. The control method is carried out ina magnesium oxide coating system composed of liquid distribution tanks and circulation tanks, wherein the liquid temperature of each liquid distribution tank is controlled by a refrigerating machine,and the liquid temperature of each circulation tank is controlled by the refrigerating machine; first temperature adjusting valves are arranged on a pipeline which the refrigerating machine connects with each liquid distribution tank, second temperature adjusting valves are arranged on a pipeline which the refrigerating machine connects with each circulation tank; the refrigerating machine is opened, the temperature is set to be minus 10-0 DEG C, the first temperature adjusting valves are opened, the opening degrees of the valves are adjusted to be 20-80% so as to control the liquid temperature in the liquid distribution tanks to be 0-15 DEG C; and the second temperature adjusting valves are opened, the opening degree of the valves are adjusted to be 20-100% so as to control the liquid temperature in the circulation tanks to be 5-20 DEG C until the coating of the surface of the grain-oriented silicon steel is finished. According to the control method, the control of the water content of a magnesium oxide coating liquid to a certain degree is realized.

Description

Technical field [0001] The invention relates to a magnesium oxide coating solution for oriented silicon steel, belonging to the technical field of metallurgy, and in particular to a method for controlling the temperature of the magnesium oxide coating solution for oriented silicon steel. Background technique [0002] Oriented silicon steel, also known as cold rolled transformer steel, is an important ferrosilicon alloy used in the manufacture of transformer cores. Due to its complex production process, strict manufacturing technology, long procedures, and many influencing factors, it has always been a spire product in the steel industry. Known as the steel artwork. Oriented silicon steel undergoes decarburization annealing in a continuous furnace and before high temperature annealing, it is necessary to uniformly coat the upper and lower surfaces of the strip steel with magnesium oxide coating solution. The magnesium oxide acts as a release agent to prevent the strip from stickin...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21D8/12C21D11/00
CPCC21D8/1283C21D11/00
Inventor 雷艳夏乘峰陈文聪郭小龙谢文亮马正强朱永章余翔侯志刚艾昊
Owner 武汉钢铁有限公司