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Circulating water closed system corrosion inhibitor as well as preparation and application methods thereof

A closed system, corrosion inhibitor technology, applied in the field of water treatment, can solve the problems of harmfulness to human body and the environment, high phosphorus content of corrosion inhibitor, limited use range, etc., to achieve no environmental impact, low corrosion rate, long effective time Effect

Inactive Publication Date: 2018-04-10
TANGSHAN JINSHA WATER TREATMENT COMPANY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In order to solve the corrosion problem of the soft water closed system in the prior art, the commonly used corrosion inhibitor phosphate series corrosion inhibitor has high phosphorus content, which is easy to cause eutrophication of the water body; while the oxidative corrosion inhibitor is generally harmful to the human body and the environment, and the dosage is large. The defect that its scope of use is limited, the first of the present invention is to provide a kind of corrosion inhibitor for the closed system of circulating water which avoids the corrosion of the closed system, is green, economical, environmentally friendly, has excellent corrosion inhibition performance, is biodegradable, and has low toxicity; the second is to provide A method for preparing a corrosion inhibitor for a closed circulating water system; the third is to provide an application method for a corrosion inhibitor for a closed system for circulating water

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0048] The raw materials of corrosion inhibitor are calculated by weight percentage, soft water 30%, organic silicate 42%, natural dispersant 12%, fatty acid salt 15%, copper corrosion inhibitor 1%.

[0049] According to the weight of the copper corrosion inhibitor (prepared 100 kilograms), first add 40 kilograms of dissolving agent dilute alkali to the reactor, and then add 60 kilograms of mercaptobenzothiazole, and stir until all is dissolved to obtain the copper corrosion inhibitor for use.

[0050] Check whether the reactor is clean, use a pump to add 30% soft water to the reactor by weight percentage, and add 42% of organosilicates, 12% of sodium gluconate, 15% of fatty acid salts, and copper to the reactor. Corrosion inhibitor 1% (the above mix is ​​good, spare). Stir until all is dissolved and there is no visible insoluble matter, check and discharge.

Embodiment 2

[0052] Corrosion inhibitor raw materials are calculated in weight percentage, soft water 25%, organic silicate 50%, natural dispersant 10%, fatty acid salt 12%, copper corrosion inhibitor 3%.

[0053] According to the weight of the copper corrosion inhibitor (prepared 100 kilograms), first add 50 kilograms of dissolving agent dilute alkali to the reactor, and then add 50 kilograms of mercaptobenzothiazole, and stir until all is dissolved to obtain the copper corrosion inhibitor for use.

[0054] Check whether the reaction kettle is clean. Use a pump with 25% soft water, add 50% organic silicate, 10% sodium lignosulfonate, 12% N-acylamino carboxylate, and copper corrosion inhibitor. 3% (above mixing is good, spare). Stir until all is dissolved and there is no visible insoluble matter, check and discharge.

Embodiment 3

[0056] The raw materials of corrosion inhibitor are calculated by weight percentage: 43% soft water, 38% organic silicate, 10% natural dispersant, 8% fatty acid salt, and 1% copper corrosion inhibitor.

[0057] According to the weight of the copper corrosion inhibitor (prepared 100 kilograms), first add 70 kilograms of dissolving agent dilute alkali to the reactor, and then add 30 kilograms of mercaptobenzothiazole, and stir until all is dissolved to obtain the copper corrosion inhibitor for use.

[0058] Check whether the reaction kettle is clean. Use a pump with 43% soft water on the basis of weight percentage. Add 38% of organosilicate, 10% of sodium gluconate, 15% of N-acylaminocarboxylate, and 1% of copper corrosion inhibitor. (The above mixing is good and spare). Stir until all is dissolved and there is no visible insoluble matter, check and discharge.

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Abstract

The invention discloses a circulating water closed system corrosion inhibitor as well as preparation and application methods thereof. The corrosion inhibitor is composed of the following components inpercentage by mass: 30-50% of a silicate, 10-15% of a natural dispersant, 5-15% of a carboxylate, 1-3% of a copper corrosion inhibitor, and the balance of soft water; and the preparation method of the corrosion inhibitor includes the steps of preparing the copper corrosion inhibitor, pumping a quantitative inorganic silicate or organic silicate into a reaction kettle, performing stirring until all the materials are dissolved, and adding the natural dispersant, the carboxylate and the copper corrosion inhibitor into the reaction kettle, and includes other steps, so that finally the product corrosion inhibitor is obtained. The corrosion inhibitor provided by the invention has stronger chemical adsorption at the metal surfaces, slows anode and cathode reactions, relieves the corrosion of a soft water system material, has strong corrosion inhibition performance and long effective time, and forms a composite membrane protection system to protect a device against corrosion; and the preparation method of the corrosion inhibitor is scientific, and the corrosion inhibitor has significant effects when being used for water treatment in a steel plant.

Description

Technical field [0001] The invention relates to water treatment technology in the chemical field, and particularly relates to a corrosion inhibitor for a circulating water closed system in industrial and mining enterprises, especially iron and steel enterprises, and a preparation and application method thereof. Background technique [0002] Industrial cooling water accounts for about 60% to 80% of the total industrial water. Therefore, the recycling of industrial cooling water is the most effective and important way to save industrial water. There are two ways of industrial cooling water circulation: open and closed. The closed water loss is very small, and it is possible to use high-quality water (soft water) as the cooling medium to avoid system fouling. Therefore, in recent years, the soft water closed system has become more and more widely used in iron-making blast furnaces, steel-making converter drums, and continuous Casting molds, power plant boiler water, central air con...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F5/10C23F11/08C02F103/02
CPCC02F5/105C02F2103/023C02F2303/08C23F11/08
Inventor 张会红马怡琳裴红莲白坤歌霍彩霞
Owner TANGSHAN JINSHA WATER TREATMENT COMPANY
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