Strip steel cleaning method capable of reducing alkali liquor consumption
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A technology of lye and strip steel, which is applied in the field of iron and steel metallurgy, can solve the problems of high process cost, discharge of hazardous lye chemicals, and high lye consumption, so as to reduce lye consumption and increase economic and social benefits , the effect of reducing the consumption of lye
Active Publication Date: 2021-09-21
BEIJING SHOUGANG COLD ROLLED SHEET
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Problems solved by technology
The current strip cleaning method has the problem of excessive consumption of lye, which leads to high process costs and the discharge of hazardous chemicals such as lye, which has a negative impact on increasing the economic and social benefits of the enterprise.
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Embodiment 1
[0052] A kind of strip cleaning method that the present embodiment provides to reduce the consumption of lye is illustrated by taking the 1850 steel strip of a certain domestic cold rolling factory as an example.
[0053] (1) Most domestic steel mills will conservatively choose high-concentration lye to ensure cleaning quality, but the lye concentration has remained unchanged, basically fixed at about 35g / L, and has not been adjusted according to the cleanliness of incoming materials , which leads to an excess of lye.
[0054] (2) Saponification reaction principle: According to actual inspection, the composition of residual oil in chilled rolls is mainly composed of two parts, palm fat and fatty acid, the ratio of the two is about 4:1, and the equations of its reaction with lye are respectively:
[0055] A, the reaction equation of palm fat and lye is:
[0056]
[0057] B, the reaction equation of fatty acid and lye is:
[0058] RCOOH+NaOH→RCOONa+H 2 o
[0059] It can b...
Embodiment 2
[0069] A kind of strip cleaning method that the present embodiment provides to reduce the consumption of lye is illustrated by taking the 1850 steel strip of a certain domestic cold rolling factory as an example.
[0070] In the present embodiment, the area s of the strip passing through the lye tank in 60min is 36000m 2 , strip width b = 1500mm, f 1 and f 2 3360L and 3000L respectively; the number of nozzles is A 1 and A 2 16 and 150 respectively;
[0071] The amount of residual oil on the surface of the strip α = 250mg / m 2 ;
[0072] Assuming that the concentration of lye in the alkaline washing tank is β at this time, then within time t:
[0073] 276×s×α=164×β×(b / 2100)×(f1×A1+f1×A2)
[0074] Can calculate the lye concentration β=42mg / L in the soda washing tank at this moment thus. The lye concentration at this time follows the dynamic change of the residual oil on the surface of the steel strip passing through the cleaning section. For the convenience of operation, ...
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Abstract
The invention discloses a strip steel cleaning method capable of reducing alkali liquor consumption. The method comprises the following steps that the alkali liquor is placed in an alkaline bath, strip steel with the width of b and the residual oil quantity of alpha is moved horizontally above the alkaline bath, and the area s of the strip steel passing through the alkaline bath within the time t is obtained; the alkali liquor is sprayed to the surface of the strip steel at the total flow L, and the covering width of the alkali liquor in the spraying process is d; in the spraying process, the preset concentration beta of the alkali liquor is obtained according to the width b, the residual oil quantity alpha, the area s and the total flow L; and the concentration of the alkali liquor in the alkaline bath is adjusted to be the preset concentration beta. An inventor analyzes overhigh consumption of the alkali liquor, and dynamically matches the concentration of the alkali liquor according to a saponification reaction principle, so that the purpose of reducing the consumption of the alkali liquor is achieved; the consumption of the alkali liquor can be effectively reduced, and the process cost is reduced; and moreover, the discharge of dangerous chemicals such as the alkali liquor can be reduced, and the method has great significance for increasing the economic and social benefits of enterprises.
Description
technical field [0001] The invention relates to the technical field of iron and steel metallurgy, in particular to a strip cleaning method for reducing the consumption of lye. Background technique [0002] There are always some rolling oil, iron powder and other pollutants on the surface of the strip after cold rolling. Before entering the annealing furnace, the surface must be cleaned to remove the residue on the surface of the strip. The cleaning medium in the cleaning section is lye, whether it can effectively separate the iron-containing sludge in the lye; it is related to whether it can effectively reduce the consumption of lye, reduce energy consumption, and whether it can effectively improve the cleaning of lye degree and other issues. These will directly affect the commissioning and use quality of the PALL ceramic membrane degreasing system, as well as the cleaning quality of the strip and the maintenance frequency of the entire line of rollers. The concentration o...
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