Metal Melting Furnaces

6.1.3 Arc furnace

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An electrical furnace is also a good equipment for melting gold and other precious metals. There are two different types of arc furnaces: Direct arc furnace, and indirect arc furnace.

In direct arc furnace, its chamber is lined with materials that are refractive in nature. The arc is positioned between the electrode and charge. There are three electrodes that are made of graphite or carbon. These electrodes are projected from the top of the furnace. A three-phase supply is provided, and the current goes through them via the charge (material to be melted). This reveals that the arc is in direct contact with the charge; this makes it possible for this kind of furnace to produce the highest temperature for melting.

On the other hand, an indirect arc furnace is formed between the two electrodes and the heat that is produced gets to the charge through radiation. Because there is no direct contact with the charge, the heat produced by indirect electrical charge is lower when compared with the heat generated by direct electrical arc furnace.

6.1, Equipment for melting precious metals

The three types of furnaces outlined above are useful for different purposes. If you are targeting a very small-scale precious metal melting (mostly at home or in a small foundry), it is advisable that you should use the propane burner. It is the cheapest and less dangerous.

However, for a medium-sized foundry or metalworking workshop, the electric arc furnace may be used. Its production capacity is larger than that of the propane burner, but it is less than that of the induction melting furnace.

The induction melting furnace for the precious metals are the latest technology in town. Its capability is huge, and the amount of materials it can handle increases based on the design of the furnace. It is also the safest and more efficient method for melting precious metals.

6.3, Equipment for melting precious metals

Unlike other kinds of metals, the precious metals are more delicate and destructible. So, it is important that they are handled with utmost care. To obtain a good result while melting precious metals, the following safety measures are necessary:

• Corrosive nature: Precious metals such as gold, silver, platinum, and others can corrode if they are not handled carefully. It means they can lose their shining surface when scratched. So, make sure your precious metals are not stored or placed near other metals or hard materials that can scratch them.
• Oxidation: When exposed to excess oxygen during melting, most precious metals can be oxidized. When oxidation takes place, a precious metal may lose its physical or even chemical properties. To obtain precious metals in their natural and good states, it is advisable that an anti-oxidation environment should be used. All induction melting furnaces have anti-oxidation systems. Otherwise, the precious metals can be covered with inert gases to prevent oxidation during the melting processes.
• Impurities: Sometimes, some alloys of certain precious metals may contaminate the final precious metal if the melting procedure is not done well. In this case, it is important to note the different melting points of the constituent elements in order to guarantee that they are perfectly melted and the precious metals are purified.

Chapter 7:

How to choose the best metal melting furnace

You need to concentrate on choosing the most useful metal melting furnace for your operations if you want to get great results.

7.1, 10 important factors to consider while choosing the best metal melting furnace

1. Size: Depending on the size of your operations, selecting a furnace that will deliver exactly what you need should be your priority. There is small, medium, and large metal melting processes. If your melting capacity is below 1kg, you may go for a small furnace. But if you are aiming for more than 25kg capacity, it is advisable you should get a large furnace or a tilting mechanism that will allow fast pouring-out and re-filling of crucibles with the molten metals.
2. Efficiency: Induction metal melting furnace is considered a very effective melting equipment because of its good technology that makes melting easy as ABC. Since its invention, induction melting furnace has helped metalmaking companies improve not only their performances but also profitability.
3. Safety: In everything, even in metal melting business, safety comes first. Look for melting furnaces that will provide the required protection for your workers as well as your business.
4. Durability: Choose a metal melting equipment that can last for many years. Getting a durable furnace will help you save on yearly overhead or cost of running your business.
5. Easy installation: You should go for a melting furnace that is very easy to install or maintain. You will save money you should have spent on periodical maintenance if your melting furnace is difficult to manage by you or your staff.
6. Technology: Most of the metal melting furnaces in town utilize technologies that are peculiar to their making or designs. Choose the one that is the most suitable or useful for your metal melting goals.
7. Cost: If you are starting out as a metalmaking company owner, you may want to consider the cost or price of getting a melting furnace before settling down on one.
8. Compatibility: Sometimes you may need to combine one or two technologies together to achieve better metal melting performance. In that case, choose a melting furnace that can work well with other technologies.
9. Environmentally friendly: Nowadays, every country makes laws that will make sure your melting operations will not affect the environment or the people living in it. So, buy a furnace that is less polluting and has no harmful effects on people working in your company. More information about environmental friendliness is provided below.
10. Warranty: Do not buy a melting furnace that has no warranty on it. This means that the manufacturer is not quite sure of the quality of their products. You should ask for, at least, one or two years warranty on whatever furnace you are buying.

7.2, Environmental and legal considerations while using a metal melting furnace

The reason why some countries make it necessary for operators of metalmaking companies to obtain licenses before operating is to make sure that their operations are legal and environmentally friendly.

Here are some important legal and environmental considerations you should take before or in the course of operating a metal melting company:

1. Location: Make sure you choose a place that is not in the middle of a residential area to avoid being disrupted by the other residents may claim that your plant or factory is making too much noise.
2. Government papers and licenses: Obtain all the required documents before starting your metalmaking factory or company. Some delegations from local health or business affairs ministries may visit your factory to be sure it is designed or built to the standards.
3. Less pollution: Only use equipment or machines that will produce minimal or no noise, water, air, and land pollution. It is mostly unacceptable in many nations to run a metal melting operation that is dangerous to human health and safety. So, make sure you are using a technology that can guarantee some safety for people.
4. Renewable technology: One of the best ways to reduce or eradicate pollution is to use the latest technology in metal melting. Take for instance, the induction melting furnaces are known for their clean and pollution-free operations. It is very important that you use a melting furnace that has renewable wastes. With this, you do not need to worry about disposing off the wastes coming from the furnace.
5. Permissions or permits: Depending on your location, you may need to get some permissions or permits before you can operate a metal melting furnace or factory. If you have done the right thing at first, you will be able to operate your factory with peace of mind without necessarily worrying about being sued by people or prosecuted by the local authorities.

Summary

This final chapter takes a critical look at the other factors that you must consider before setting up an effective metal melting operation. You must be legal and responsible; this means that you will be operating within the confines of laws and regulations in your locality. To achieve this, you may be required to obtain some permits, permissions, or licenses. You will buy melting furnaces that will produce little or no pollution and has a renewable technology. You will equip your metalmaking factory with protective gadgets or devices so that your workers can operate without any fear.

Chapter 8:

Conclusion

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This comprehensive metal melting guide has taken you through all the most important steps you need to know as far as metal melting process is concerned. You have also learned about the different types of melting furnaces and how to use them.

As additional information, you need to understand that each country or locality has distinct laws and regulations that guide their metal melting operations. So, do the necessary research to find out which legal and environmental considerations you must have before starting your metal melting business or factory.

You should also pay attention to the manufacturers' instructions and guidelines if you want to obtain the most desirable results from your metal melting processes. Do not forget that each manufacturer has separate specifications as far as their equipment is concerned; so, stick to their instructions if you want your melting furnaces to have longer shelf-life.

Remember to create a good working environment for your workers and furnaces. Operating in a dusty and dirty environment can damage the equipment within a short period of time. And exposing your workers to a dangerous working condition or environment can destroy their health and reduce their performance or productivity.

It is advisable that you acquire the right kinds of metal melting furnaces that will handle your scale of metalmaking operations. You may purchase an equipment for melting metal with electricity. However, if you are operating small-scale, then a machine for melting bronze at home or mini metal melting furnace may be appropriate. The main considerations here are cost, efficiency, and longevity of those machines. If you bought a furnace that cannot last for a long time you may be required to buy another one very soon. This is applicable to used or second-hand metal melting furnaces. New furnaces can last for a long time, and this is why it is often reasonable to purchase new equipment directly from the manufacturers. But if you are facing financial constraints and wish to manage the little funds you have, you can try your hand on a used furnace but make sure it will work well for a long time.

If you do not know how to go about getting a good metal melting furnace, why don't you contact a manufacturer's sales team? They will advise you about the right thing to do.

Hasung Dual Use gold and platinum melting furnace can efficiently and effortlessly melt platinum, silver, gold, palladium and certain alloys.

Hasung's tilting induction melting furnace with safety board design, tilting pouring handle on the side design to ensure safety for operators.

Hasung's tilting induction melting furnace uses solid aluminum stage and boards makes high quality melting chamber device. With rotary tray for loading graphite mould.

The compact size of the platinum melting furnace makes it convenient to move about.

Hasung multipurpose gold and platinum melting furnace is also suitable for small scale melting because it melts about 1g to 2kg of metals at once, therefore, small businesses that require melting need not worry about getting a melting furnace that only meets their melting needs.

The power utilization of the platinum melting furnace is 5kw, this means that energy is saved when melting with the platinum melting furnace and you don't have to worry about extra spending on extra power.

Hasung multipurpose gold and platinum melting furnace can meet the melting needs at a jewelry store, recreational metal diggers, research institutes and recycling old metals.

Hasung multi-purpose gold and platinum melting furnace is environmentally safe to use such that the furnace does not generate harmful gases or make disturbing noise. It is also safe for workers to operate as molten metal spillage does not occur.

The melting time is very fast, the platinum melting furnace melts at ' within 2 minutes, thereby, increasing your work and production efficiency.

All metals melted with our platinum melting furnace usually have a uniform consistency so that when such metal is cast, it has a high-quality finish.

The electromagnetic induction stirring function present within the platinum melting furnace makes the melting process efficient by transferring heat equally and all parts of the metal are melted evenly. This also means that all heat required for melting is totally utilised within the furnace, hence, no increase in temperature of the melting environment.

The in-built water-cooling system present within the furnace makes the furnace melting temperature to be controlled, thereby preventing overheating.

The induction heating technology present within the platinum melting furnace makes the electromagnetic induction possible, which means that all energy that is required for melting is completely utilized within the melting furnace.

The platinum melting furnace is very easy to operate. The control panel makes it easy for you to control and monitor the melting process.

The Hasung multi-purpose gold and platinum melting furnace is environmentally safe as no heat is caused during use, no gas is released and no noise occurs when melting with the platinum melting furnace.

The melting capacity of any melting surface reaching up to ' would normally consume excess power, but our gold melting equipment for sale only requires 15kw to begin melting making it cost-effective.

All 8kg melting is done efficiently in 3 minutes, an undefeatable feature of the gold melting equipment for sale. The speed of melting helps you to meet all melting demands faster and more easily.

Gold, silver, bronze, copper, platinum and other alloys can all be melted with our gold melting equipment. This enables you to save money on other melting equipment.

The water pump system present in our gold smelting equipment makes it maintain a normal temperature when melting is ongoing. Thereby, you save money on cooling equipment.

Our gold melting equipment is suitable to melt metals for research and teaching, foundries, recycling metals in jewelry stores, etc.

In respect to its impact on the environment, the noise of the gold and silver melting equipment during the process of melting is relatively low and there is no emission of gas, smoke or dust is also low.

Compared to resistance furnaces and propane burners, Hasung gold melting equipment ensures no loss of metals during the melting process, making our melting equipment more efficient than both resistant furnaces and propane burners.

Our gold and silver melting equipment can work continuously for as long as 24 hours.

The operator of the gold melting equipment has a total control of the melting parameters. Should an error occur, the omni-directional warning system helps to raise alarms when potentially harmful points are reached during melting, thereby ensuring the safety of the user.

Maintenance of the gold and silver melting equipment is easy as the crucibles are detachable and can be cleaned after each melting process.

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