How to change the problem of serious pollution of heat treatment

For a long time, electroplating, casting, forging and heat treatment have been the leading directions of environmental pollution. Due to the weak awareness of personal environmental protection and the weakness of supervision, the environmental damage is becoming increasingly serious. As heat treatment workers, how should we face these problems and how to start from ourselves?

It's worth pondering. Heat treatment production causes great pollution to the environment, including exhaust gas, waste water, waste liquid, waste residue, dust, noise, electromagnetic radiation, etc., and with the development of production, its harm is becoming more and more serious. Let's talk about a few subjective solutions: 1. Vigorously develop multi-parameter heat treatment and composite heat treatment processes Vacuum heat treatment, chemical heat treatment, deformation heat treatment, composite heat treatment Technology promotion and wide use 2 Adopt new heating sources and new heating methods 3 Adopt new quenching medium and improve quenching methods 4 Research and development of various new heat treatment equipment 5 Strengthen the close integration and mutual promotion of new materials and heat treatment processes 6 Pay attention to heat treatment energy conservation and environmental protection.

It is OK to use a real air quenching furnace, which is environmentally friendly. The effect is good again. The deformation is small, no oxidation and no decarburization, and the process is recoverable, and it will not produce a good furnace and a bad furnace

The pollution of heat treatment mainly comes from the oil smoke from tempering; and the emission of combustion gases from chemical heat treatment. The best way to do this is to replace oil with water. It has been basically realized in foreign countries, but there are still certain difficulties in our country.

The fire-stained workpiece is cleaned and then tempered, so that there is a lot less oil smoke. Chemical heat treatment should be emitted as little as possible, and if conditions permit, it should be done well and reused. There is a long way to go, and there is a long way to go!

For a long time, the majority of heat treatment workers have made unremitting efforts to protect the environment and the physical and mental health of operators, and have achieved certain results. Since the beginning of the new century, the state has attached great importance to environmental protection work, and many people of insight have vigorously called for the development of "green heat treatment" technology and actively carried out the research and development of clean heat treatment technology. Low energy consumption, less pollution heat treatment equipment and technology, such as controlled atmosphere heat treatment, vacuum heat treatment, surface modification, composite heat treatment, controlled cooling, etc., in large cities and national key backbone enterprises The application has gradually expanded, and the heat treatment environmental protection work has made certain progress in the industry.

However, there is still a big gap compared with the advanced environmental protection concepts and technologies of developed countries, especially small and medium-sized heat treatment enterprises, including some private enterprises in suburban towns and villages, driven by economic interests, environmental awareness is weak, and heat treatment production pollution continues to expand. On the whole, the environmental pollution caused by heat treatment production has not been fundamentally changed.

Depending on the heat treatment equipment and process, the contaminants are also different, and there are roughly the following aspects:

Ordinary heat treatment: quenching oil will have fume gaseous pollutants.

Salt bath furnace: The main pollutants are waste salt, salt vapor, and wastewater from cleaning quenched parts, because salt bath furnaces often use barium salts with high toxicity.

Controlled atmosphere furnaces: Possible contaminants include leaked organic compounds such as ammonia, methanol, benz, carbon monoxide, etc.

Medium and high frequency equipment: mainly electromagnetic pollution, but the national standard requires that this type of equipment must be shielded, generally speaking, it will not be polluted under normal circumstances.

Heat treatment testing equipment: mainly radiological nondestructive testing equipment, such as X-ray, R-ray, etc.

Heat treatment auxiliary surface treatment equipment: such as blue and black, sandblasting, shot blasting, etc. There are also those who do not count this in the category of heat treatment pollution.

Mainly waste water and exhaust gases.

Wastewater is corrosive or contains heavy metals.

Exhaust gases are fuels that are not completely burned.

Of course, if there is a fan running, noise is also a pollutant.

Waste gas, waste residue, waste water, industrial waste.

In a narrow sense, environmental pollution includes air pollution, water pollution, soil pollution, solid waste pollution, biological pollution, and physical pollution, such as noise, electromagnetic radiation, vibration, thermal pollution, etc.

Air pollution control technologies mainly include separation method and conversion method, such as mechanical dust removal, filtration dust removal, electrostatic precipitator, absorption method, adsorption method, combustion method, etc.; Water pollution control technologies include physical, chemical, and biological methods; Soil pollution purification and control technologies include guest soil method, isolation method, cleaning method, heat treatment method, incineration method, microbial purification method, plant purification method, etc.; Solid waste mainly includes composting, incineration, landfill, etc.; Physical pollution control technologies include isolation, shielding, absorption, and reduction technologies.

Environmental pollution will also lead to ecological damage, so there are also corresponding ecological restoration and construction technologies.

Air pollution, water pollution, geological pollution, etc.

It is up to everyone to protect the environment.

If coal is used for heat treatment, carbon dioxide, sulfur dioxide, etc. will generally be produced. To put it bluntly, it is the incomplete combustion of fuels and the combustion products of impurities.

There are many heat treatments, such as steel to produce SO2, H2SO....

There are many types of heat treatment, depending on what kind of heat treatment is used, whether it is electricity or fuel heating. It's better to be detailed.

Generally, the whole treatment is done before processing. The surface treatment is made as the final process after processing.

The key to what method to use is to look at the hardness and strength requirements of the workpiece, and then see what treatment method can be used to meet the requirements of the material.

It is not something that can be thoroughly understood in a day or two, the key is to accumulate knowledge. If you have time, take a look at the material manual, which has the processing methods and emotional properties of various materials, and will also be classified according to the most commonly used treatment methods, such as quenched and tempered steel, nitriding steel and so on. You can't just drill the heat treatment process, that is not to learn.

After looking at the second floor, I should understand it now.

Common knowledge of heat treatment How many do you know?

Upstairs, please send me a copy too, thank you very much

Give it to your email address and send you an electronic copy.

Modern heat treatment technology (new reform).pdf

A new process for steel heat treatmentpdf

It depends on what kind of heat treatment it has, and there is more wastewater from salt bath quenching.