Quenching oil regeneration method

A quenching oil and weight technology, which is applied in the direction of quenching agent, heat treatment equipment, manufacturing tools, etc., can solve the problems of complicated process, complicated additional processing equipment, high cost, etc.

Active Publication Date: 2013-03-20
CHINA PETROLEUM & CHEM CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved by the present invention is that the regeneration method of the prior art requires complex additional treatment devices, complex procedures and high cost. A new regeneration method for quenching oil is provided

Method used

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Experimental program
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Effect test

Embodiment 1

[0025] The quenching oil to be treated is fast and bright quenching oil that has been used for more than two years. The viscosity and acid value increase, and quenching soft spots appear on the workpiece after quenching. It is regenerated, which specifically includes the following steps:

[0026] a) After the quenching oil to be treated is naturally settled, the oil sludge impurities deposited at the bottom of the quenching tank are removed;

[0027] b) adding acid value reducing agent CaO to react with the acidic substance in the oil, the addition amount is 1%, and stirring and reacting at 70°C for 3 hours;

[0028] c) Adsorption and filtration is carried out with activated clay to remove salts and water impurities in the oil; the treatment temperature is 70°C, the treatment time is 2 hours, and the consumption of activated clay is 8%;

[0029] d) After filtering, heat the quenching oil to 90° C. and circulate and stir for 3 hours to remove trace moisture in the quenching oi...

Embodiment 2

[0036] The quenching oil to be treated is ordinary quenching oil that has been used for many years. The aging phenomenon is obvious, and the performance of some parts cannot meet the technical requirements of heat treatment after quenching and tempering. It is regenerated, which specifically includes the following steps:

[0037] a) After the quenching oil to be treated is filtered through a wire filter screen with a mesh size of 1.0×1.0mm, impurities such as iron oxide and oil sludge in the quenching oil are removed;

[0038] b) Add acid value reducing agent Mg(OH) 2 React with the acidic substances in the oil, add 0.8%, stir and react at 70°C for 2 hours, reduce the acid value of the quenching oil;

[0039] c) Adsorption and filtration with diatomaceous earth to remove salts and water impurities in the oil; the treatment temperature is 70°C, the treatment time is 2 hours, and the amount of diatomite is 10%;

[0040] d) After filtering, heat the quenching oil to 90° C. and ci...

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Abstract

The invention relates to a quenching oil regeneration method. The quenching oil regeneration method mainly solves the technical problem that the existing regeneration method needs complicated additional treatment units, and has complicated processes and a high cost. The method comprises the processes of 1, sedimentation or filtration, 2, acid value reduction, 3, adsorption, 4, dehydration, and 5, function adjustment, wherein at least one used acid value-reducing agent is selected from oxides, hydroxides and carbonates of alkali metals and alkaline-earth metals and the weight of the at least one used acid value-reducing agent is 0.5-3.0wt% of the weight of quenching oil to be treated. The quenching oil regeneration method solves the existing problem and can be used for industrial production of the regeneration of quenching oil.

Description

technical field [0001] The invention relates to a quenching oil regeneration method. Background technique [0002] Quenching oil is one of the most commonly used cooling media in heat treatment production. It is widely used in industries such as automobiles, bearings, fasteners, mining machinery and tooling, with an annual demand of about 50,000 tons. In long-term use, the quenching oil is in direct contact with red-hot workpieces, air, etc., and a series of reactions such as oxidation, polymerization, and thermal decomposition will occur, which will inevitably cause a certain degree of aging, resulting in increased oil viscosity and acid value. Increase, cooling performance decreased significantly, etc., resulting in the hardness and structure of the workpiece after quenching in production could not meet the process requirements, and the scrap rate increased. [0003] Aiming at the problem of quenching oil aging, it is generally solved by replacing the quenching oil in the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21D1/58
Inventor 张旭郑春燕王士庭李晓阳朱秀艳李谨
Owner CHINA PETROLEUM & CHEM CORP
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