Used gravity separator

Types of used gravity separators

A Gravity separator is an equipment used for separating dry granular products of different densities, weights, sizes, and shapes. The fundamental working principle of the gravity separator is that the same volume of different particles has distinct weights or densities.

Falling water droplets are an excellent example of how people can relate to the separation principle in a used gravity water separator. Larger/denser droplets fall faster, while smaller/lighter ones lag and may be blown by the wind.

The used gravity separators can be classified into three categories:

• Air separators: Also known as air classifiers, the selectors work based on the particles' terminal velocity, buoyancy, and drag force exerted by the air. Usually, lighter particles are carried away by the air or wind, while heavier ones settle down to the ground. Separators can have different mechanisms and designs to utilize airflow for distinguishing between light and heavy materials.
• Fat separators: Fat separators are liquid-based used gravity separators. They utilize the fact that fat particles will always rise to the surface of any liquid. Fat separators comprise a funnel-like structure where surface fat gets collected and drained out separately. Usually, the fat separator is the first step in processing, refining, and separating milk.
• Eddy current separators: Eddy current separators are unique used gravity separators that rely on electromagnetic fields to distinguish between materials. The separator mainly separates non-ferrous metals like aluminum, copper, and brass from other types of materials. An eddy current separator comprises a rotor with strong magnetic fields. Non-ferrous metals are repelled by the electric magnetic fields forming eddy currents. They are propelled forward, thus separating them from the rest of the materials.

Specifications and maintenance of used gravity separators

Gravity separators are available in different specifications to suit a variety of applications. Some common used gravity separator specifications include the following:

• Separator surface area: Gravity separators come in different surface areas ranging from laboratory to industrial scale. A small surface area, such as 0.5 to 10 m2, is common for test models, while larger models can have over 50 m2 of surface area.
• Capacity: The separator's capacity to process material per hour differs among models. Small gravity separators can have a capacity of 100 to 200 kg/h, while larger models can handle several tons per hour. Typical separator capacities are 500, 1000, 3000, and 5000 kgs/h.
• Airflow: Gravity separators work by using air to float lighter impurities and depend on the volume of air they can process. Typical models float an airflow of 10,000 to 50,000 m3/h.
• Table dimension: The dimensions of the separating table vary, but they typically have a length of about 305 to 610 cm and a width of about 122 cm to 244 cm.
• Table inclination angle: The angle of the table varies among models. The typical angle is between 0.5° and 2°. Adjusting the inclination of the table helps to modify the spreading and collecting zones of the material.

Maintaining a used gravity separator is necessary to keep it in good working condition. It is also essential for the success of any food processing factory. The first maintenance requirement, which most people do not recognize, is to flush the machine once it has been used to process any product. The gravity separator should be cleaned immediately, as residual oil may solidify and become immovable after a while.

There are a few periodic separator maintenance procedures. Regularly examine the lock washer and nut in the drive belt to determine their condition and the need for adjustment. Routine belt cleaning and lubrication are necessary to avoid unsafe and difficult operating conditions. Lubricate the drive belt with a dry belt conditioner, and keep it free of contaminants. Use conditioner sparay on the underside of the belt only. The area of the hose on the upper side is usually smooth and is the only area that should be sprayed.

Dust and contaminant build-up on electrical contacts should also be cleaned from time to time. A compressed air nozzle can be used to clean these areas. Always ensure the power is off before cleaning electrical connections.

Scenarios

The used gravity separators are beneficial in different industries. Here are some of the typical applications of this separator.

Food processing companies use the gravity separator to remove impurities in crops like coffee and cocoa. Rotten coffee beans with lower density float to the top of the separator and are removed as valuable coffee beans sink. Therefore, farmers and food processors get quality products that meet the expectations of end users. The air flow in the separator also helps to remove unhealthy fungus and molds that can cause health issues.

The gravity separator is widely used in the mining industry to separate valuable minerals from worthless gangue. It can separate ore mineral due to differences in density, weight, and size. Some valuable minerals separated by this device include gold, copper, and diamonds. Using a gravity separator in the mining industry is cost-effective and eco-friendly. There is no need for chemical treatment or mineral exploitation.

Petrochemical industries use gravity separators to separate crude oil from water. Crude oil is denser than water and therefore, will settle at the bottom of the separator. Water is then drawn out from the separator. Gravity oil water separators protect the environment by preventing oil from entering water bodies.

Recycling companies use the gravity separator to separate plastics of different densities and types. Heavy glass fragments sink to the bottom while light plastics float. The difference in density and weight separates the materials. Next, workers collect the separated materials and recycle them accordingly. The gravity separator increases the efficiency and accuracy of recycling facilities.

How to choose a used gravity separator

Choosing the right gravity separator is crucial for business operations. Consider the following before buying a gravity separator:

• Separator type:

  Understand the type of gravity separator. For example, know the working principle of used air gravity separators. Make sure it is suitable for the intended application. Choose a gravity separator that matches processing needs. It should have the right capacity and the features for effective operation.

• Feed composition:

  Study the materials to be processed. This includes particle sizes, shapes, densities, and moisture content. Select a gravity separator designed to handle the specific feed composition. For instance, a bulk food gravity separator is perfect for grain-heap sorting.

• Efficient separation:

  Opt for a gravity separator that provides efficient separation. This means it should achieve the desired purity levels and optimum recoveries. Consider the separator's capacity and throughput to match processing requirements.

• Energy use:

  Use energy efficiency as a selection criterion. Opt for a gravity separator that achieves the desired separation with minimal energy usage. A separator that consumes less energy will reduce operating costs and have a smaller environmental impact.

• Ease of maintenance:

  Choose a gravity separator with a design that allows for routine maintenance. Replace used gravity separator parts with ease. Find out if there are online resources or operator manuals that outline maintenance procedures.

• Available support:

  Consider the technical support from the manufacturer or supplier. They should provide timely support when there are gravity separator-related issues. Check if the gravity separator manufacturer has a representative in the location of use.

Used gravity separator FAQ

Q1: What are the signs that a used gravity starch separator is failing?

A1: While used separators may show signs of wear, rather significant, these include a change in separation quality, loud noises during operation, leaks, and a sluggish response.

Q2: What are the benefits of a used gravity starch separator?

A2: Separators are mainly used for the benefit of recycling, economic value, and reduced cost of separation.

Q3: What is the cost of a used gravity separator?

A3: Small gravity separators may cost between $3,000 to $5,000. However, large industrial models can cost $50,000 or more.

Q4: What materials can used gravity separators be processed?

A4: The gravity separator is suitable for a wide range of materials such as mineral ores, seeds, and grains. However, the separator's design determines whether specific materials can be processed.