Screening is one of the main stages of the mining process. During this phase, the materials processed are separated and classified into the final products desired by mining and quarrying companies.
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Therefore, we decided to list 5 fundamental points for defining the equipment and the type of screening.
The equipment supplier needs to have experience in projects to offer efficient and durable equipment. Máquinas Furlan brings together these and other attributes.
Check out the following article and learn, for example, about the recommended sieve for different applications, such as rock for agribusiness and aggregates for construction, two best-selling products in the country.
Screening in a productivity scenario
In mining, screening involves the separation and classification of materials. This step needs to be properly adjusted to the crushing and grinding of rocks. Internally, this scenario will allow the company to be productive, reduce costs and operate safely.
Externally, the approach involves the quality of final products delivered to customers and meeting deadlines, in a highly competitive environment.
How to choose the ideal screen for mining?
So, what should you consider when choosing the ideal sieve model for mining?
We point out 5 items. Check them out.
1. Plant and production data
In this checklist, check the input particle size and moisture content of the material. Indicate the desired feed. Also consider the number of decks and meshes, as well as the mesh configuration of each deck.
One example is the production of aggregates for construction, which commonly involves 3-deck screens.
2. Efficiency at work
Continuous operation and delivery of a quality end product are critical.
The sieve must be correctly sized by specialists to allow the equipment to perform the correct separation, minimizing contamination of the desired materials (sieving efficiency).
Otherwise, the desired granulometries may contain a large amount of unwanted material, compromising the quality of the final product.
3. Maintenance is also important
The industry that plans its maintenance obtains better results. Equipment serviced on scheduled dates is more reliable.
In this sense, the conditions mentioned in item 2 are closely linked to the scenario.
Also set aside resources for staff training.
4. See the screening as a whole
Want a practical example of this item? A trend in mining is to seek greater productivity, often replacing a crusher with another with better performance. This change also requires reviewing the capacity of the screen in the same deposit.
Remember that the material that does not pass through the grates on the decks returns to be re-processed. Cleaning the material to be processed is another precaution.
The shape of the processed rock, whether cubic or lamellar, also needs to be evaluated.
In this video, we show a Furlan sieve in operation.
5. Pay attention to the sieve supplier
The mining equipment market offers different solutions. The quarry needs to be careful when making this choice.
Having experience with different projects is essential. Customizing the solution generates better results.
Care with the quality of the steel used in the production of machines and parts also accredits the supplier.
At this point, the history of the equipment supplier cannot be ignored. The durability of the equipment and the resistance of the replacement and wear castings guide the decision.
Otherwise, unexpected stoppages compromise the work.
This becomes very clear when monitoring plant data. Any gains made when purchasing machines and parts are illusory if, in operation, these items constantly fail.
Máquinas Furlan presents 2 models of screens for mining
Let's now talk about the Máquinas Furlan catalog, which features two models. Their main features are robustness and productivity. Ease of operation and maintenance are also present.
Furlan Vibrating Screens (PVA model) are recommended for washing and intermediate classification of minerals, sand, gravel and stone.
Technically, it is recommended when the minimum mesh size is 8 mesh, with material ranging from 2 to 6 mm. The models have 1 to 4 decks, and are equipped with a module. It is known as a conventional sieve.
When adopted in the final classification, the PVA model is the ideal solution for the final classification of fines passing through the 2mm screen.
However, for finer products, High Frequency Vibrating Screens (PVAF model) are the most suitable. They operate in a range of application granulometry in 100% dry materials below 2 mm.
It is used in the generation of sand, gravel and artificial sand. In addition to construction aggregates, it has gained space in the ceramics industry.
It is also used in the classification of materials for use as products classified as rock used in agribusiness.
The number of plants adopting PVAF has been growing. The verticality improves the efficiency of ultrafine classification. It also adapts to the different types of processed rocks.
PVAF is highly energy efficient, which reduces operating costs. In the case of Furlan, the model comes with adjustable electric or hydraulic vibrators, which, together with a low-amplitude, high-rotation frequency inverter, assist in classification.
They have 1 to 3 decks, or modules. A set of accessories allows effective control of the programmed slope. The equipment can also come with a metal structure, walkways, stairs and bottom and front discharge spouts.
With competitive price and timely delivery, Chuangdi sincerely hope to be your supplier and partner.
How much do you know about vibrating screen? How to choose suitable vibrating screen for mineral processing plant? This article will give you nine suggestions when purchasing vibrating screen. Lets's dive in now!
Screening is the process of separating the crushed materials strictly according to the particle size. The main purposes of the screening operation are as follows:
Preventing the fine-grained particles from entering the crushing equipment to increase their production capacity and work efficiency.
Preventing the coarse-grained particles from being selected for the next operation, and ensure that the particle size of the crushed or grinding products meet the requirements.
Providing feed ore with a narrow particle size range for some gravity operations to improve the separation quality.
Further improving the quality of the products obtained in the separation process, and ensure that the quality of the final products of the concentrator meet the requirements.
According to the purpose of screening, it can be divided into five types:
Auxiliary screening. Mainly used in the crushing operation of the beneficiation plant.
Independent screening. Its purpose is to obtain the final product suitable for the user's requirements, generally divided into pre-screening and inspection screening. Pre-screening refers to the screening operation before the ore enters the crusher. Inspection screening refers to the screening after crushing. Its purpose is to ensure that the final crushed products meets the particle size requirements of the grinding operation and return the unqualified crushed products to the crushing operation.
Preparation screening. Its purpose is to prepare for the next operation, such as the gravity separation plant to screen and classify the materials before jigging so that to classify particle size as coarse, medium and fine products.
Dewatering screening. Its purpose is to remove the moisture of the material, which is generally common in coal washing plants.
Selective screening. If the distribution of useful components in the material is very different in each particle size, you can screen and classify to obtain different quality particle sizes, and screen out the low-quality particle size, thereby correspondingly improving the quality of the material.
The factors affecting the screening process can be divided into the following three categories:
The physical properties of the materials that enter the screen, including the particle size composition, humidity, mud content and shape of the ore particles. Other factors other than humidity cannot be changed at will.
Movement characteristics and structural parameters of the screen surface, including movement characteristics, the length and width of screen surface, the size and shape of the screen holes, the effective screen surface area, etc.
Operating conditions, including productivity and feed ore evenly.
Screening efficiency refers to the ratio of the actual mass of the product under the screen to the mass of the material contained in the screen that is smaller than the screen size.
Use large-size screen. The large circular vibrating screen increases the vibration force and amplitude, and also reduces the blockage of the screen surface, so that the material to be screened can be loosened, stratified and screened quickly.
Increase the screening area. When the actual amount of material on the screen surface is about 80% of the screen capacity, the screening efficiency is the highest.
Adopt a reasonable angle of inclination. The inclination angle affects the flow rate of the material on the screen surface. Generally, the moving speed of the material on the screen surface is controlled below 0.6m/s, and the screen surface maintains an inclination angle of about 15° to obtain a higher screening efficiency.
Adopt equal-thickness screening. The use of polyline screen surface with different inclination angles controls the different movement speed of the material in each section of the screen surface, so that the ore flow forward, thereby increasing the chance of the difficult-to-screen particles at the discharge end.
Adopt multi-layer screen with enlarged screen holes. Adopt multi-layer screens with gradually increasing screen holes and decreasing screen surface inclination angles from the lower layer to the upper layer, that is, screen surfaces with different inclination angles and screen holes are used for different particle sizes to prevent block the screen holes and improve the screening efficiency.
Practice has proved that different shape of the screen surface has different effective screen surface area and different chance for particles to pass through the mesh. The effective area of the rectangular mesh is the largest, followed by the square, and circular mesh is the smallest. The shape of the screen mesh best to match the shape of the material. Block materials should use square mesh, and plate materials should use rectangular mesh.
According to its structure and movement characteristics, it can be divided into the following types:
Fixed screen.
Cylindrical screen.
Plane shaking screen.
Vibrating screen.
Probability screen.
Fine screen.
Compared with other screens, the vibrating screen has the following advantages:
Higher productivity and screening efficiency. Due to the strong movement of the screen surface, the speed of the material passing through the screen holes is accelerated.
Wide range of applications. It can be used for the screening of fine particles, medium coarse particles and coarse particles, and can also be used in dewatering and desliming operations.
Favorable screen passing performance. When screening sticky and moist ores, the screen holes are not easy to be blocked.
Simple structure and convenient operation.
Low energy consumption.
Unable to start or small amplitude. The main reasons are: motor damage or circuit components failure; too much material on the screen surface; Vibrator is malfunctioning; insufficient voltage.
Abnormal material flow. The main reasons are: the horizontal level of the screen is not aligned properly; the stiffness of the support spring is too large or damaged; the screen surface is damaged; the feed is extremely unbalanced.
Poor screening quality. The main reasons are: the screen hole is blocked; the moisture of the material increases, the material layer on the screen is too thick; the screen is not pulled tightly, and the transmission belt is too loose.
Breakdown of vibration exciter bearing. The main reasons are: low matching degree between the vibration exciter bearing model and the exciter; insufficient space for thermal expansion of the bearing; poor lubrication of the bearing or the impact of external dust.
Screening equipment is one of the most important automation equipment in the concentrator, and the normal production of the concentrator needs a good operation of the screening equipment. Therefore, it is very important for concentrator to choose reasonable screening equipments.
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