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Method for reducing calcium ion content in cold rolling emulsion

An emulsion, calcium ion technology, applied in the direction of metal rolling, metal rolling, manufacturing tools, etc., can solve the problems of reducing crude oil concentration, economic loss, consumption of emulsion, etc., to achieve simple working principle, reduce production costs, improve The effect of quality

Inactive Publication Date: 2020-08-28
TANGSHAN IRON & STEEL GROUP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] The residual acid liquid on the surface of the pickling process section or the cooling water of the plate heat exchanger flowing into the emulsion can cause the calcium ion content in the emulsion to exceed the standard, which will affect the process. For example, too much chloride ion in the emulsion is easy to Lead to corrosion on the surface of the strip, and the calcium ion in the emulsion is too high, which is easy to affect the lubricity of the emulsion
This kind of thing has happened to many enterprises, which has brought certain economic losses to the production.
At present, the method to deal with the high calcium ion in the emulsion is: when the calcium ion content in the emulsion is higher than the requirements of the technical regulations, the acid mill stops to discharge a certain amount of emulsion, and then adds new emulsion. This method consumes a lot of emulsification liquid, adding substantial operating costs
[0003] The patent application with application number CN201210172496.1 discloses a method for quickly adjusting the concentration of the emulsion in a cold rolling mill, but this method is used to reduce the concentration of crude oil in the emulsion, and does not involve the treatment of high ion content in the emulsion

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Embodiment 1: the method specific practice of this reducing calcium ion content in the cold-rolled emulsion is as follows;

[0029] A single-frame unit detects that the calcium ion concentration in the emulsion tank is 150ppm, and the design volume of the emulsion tank is V=180m 3 , the initial liquid level in the tank is 80%, and the regulations require that the chloride ion concentration in the emulsion in the tank be 50ppm (that is, the target chloride ion concentration), H 设定 =H 初 . The emulsion was left to stand for 0.2 hours, and calculated using Formula I:

[0030] h 外排 =H 设定 ρ 设定 / ρ 初 =80%*50 / 150=0.267≈26%.

[0031] Implementation effect: after discharge, the remaining bottom water with a total height of 26% in the emulsion tank was added with new water, and after stirring, the concentration of the emulsion returned to the original concentration, and the calcium concentration in the emulsion tank was detected to be 50ppm to achieve the purpose of cleaning...

Embodiment 2

[0032] Embodiment 2: The specific practice of the method for reducing the calcium ion content in the cold-rolled emulsion is as follows;

[0033] A single-frame unit detects that the calcium ion concentration in the emulsion tank is 145ppm, and the design volume of the emulsion tank is V=180m 3 , the initial liquid level in the tank is 82%, and the regulations require that the calcium ion concentration in the emulsion in the tank is 50ppm (that is, the target chloride ion concentration), H 设定 =85%. The emulsion was left to stand for 0.1 hour, and calculated using Formula I:

[0034] h 外排 =H 设定 ρ 设定 / ρ 初 =85%*50 / 145=0.293≈29%.

[0035] Implementation effect: After discharge, the bottom water with a total height of 29% remains in the emulsion tank, and the concentration of the emulsion returns to the original concentration after stirring, and the calcium ion concentration in the emulsion tank is detected to be 50ppm.

Embodiment 3

[0036] Embodiment 3: the concrete practice of the method for reducing calcium ion content in the cold-rolled emulsion is as follows;

[0037] A single-frame unit detects that the calcium ion concentration in the emulsion tank is 140ppm, and the design volume of the emulsion tank is V=180m 3 , the initial liquid level in the tank is 85%, and the regulations require that the chloride ion concentration in the emulsion in the tank be 50ppm (that is, the target chloride ion concentration), H 设定 =H 初 . The emulsion was left to stand for 0.3 hours, and calculated using Formula I:

[0038] h 外排 =H 设定 ρ 设定 / ρ 初 =85%*50 / 140=0.304≈30%.

[0039] Implementation effect: after discharge, the remaining 30% of the total height of the bottom water in the emulsion tank is added with new water, and after stirring, the concentration of the emulsion returns to the original concentration, and the calcium concentration in the emulsion tank is detected to be 50ppm, which achieves the purpose of...

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Abstract

The invention discloses a method for reducing the calcium ion content in a cold rolling emulsion. The method comprises the steps that firstly, an emulsion with excessive calcium ion content in an emulsion tank is subjected to standstill to separate oil from water in the emulsion; the waste water in the emulsion tank in discharged; and finally, fresh water is added and stirred evenly. According tothe method, the physical characteristics of the emulsion and the physical characteristics of calcium ion evenly dissolved in water are utilized to achieve the rapid adjustment of the calcium ion content in the emulsion; thus within the shortest time, the least rolling oil can be consumed to reduce the calcium ion content in the emulsion to meet the specified requirements; the method is specifically suitable for a cationic emulsion used in a cold rolling mill; the quality of the emulsion of the rolling mill is effectively improved; a lot of emulsified crude oil is saved, and the production costis lowered; and the characteristics of simple working principle, easy operation and high applicability are achieved, and the method is suitable for various rolling mills.

Description

technical field [0001] The invention belongs to the technical field of cold rolling, in particular to a method for reducing calcium ion content in cold rolling emulsion. Background technique [0002] The residual acid liquid on the surface of the pickling process section or the cooling water of the plate heat exchanger flowing into the emulsion can cause the calcium ion content in the emulsion to exceed the standard, which will affect the process. For example, too much chloride ion in the emulsion is easy to It leads to corrosion on the surface of the strip steel, and the calcium ion in the emulsion is too high, which easily affects the lubricity of the emulsion. This kind of thing happened to many enterprises, which brought certain economic loss to the production. At present, the method to deal with the high calcium ion in the emulsion is: when the calcium ion content in the emulsion is higher than the requirements of the technical regulations, the acid mill stops to disch...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B21B45/02
CPCB21B45/029
Inventor 杜秀珍徐祥来薛军安梁振威贾军艳靳松赵艳
Owner TANGSHAN IRON & STEEL GROUP
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