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dust collection for crushing area

dust collection and control in crusher plant

dust collection and control in crusher plant

Crushing plant layout and ventilation system design for the Urad mine was based on our operating experience at similar crushing facilities located at the Climax operations. Low speed conveyors of generous width, adequate exhaust volumes at all ore transfer locations, large hoods and good conveyor skirting have made the Urad underground crusher dust control operations very satisfactory. Good maintenance and clean-up of the crusher facilities have made a clean working area with very low dust exposure.

The ore from the mine is dropped approximately 1000 feet through ore passes to scraping drifts above the crusher and then transferred to the coarse ore bin by 150 h.p. slusher hoists. A reciprocating plate feeder under the coarse ore bin feeds a 48 x 60 jaw crusher.

The crushing facilities are controlled from a central control room where the operator can observe several ore transfer locations by TV. The crushing plant operated by 3 men per shift, 2 shifts per day, has averaged 6000 TPD. The slusher hoists that feed the coarse ore bin are set up for remote control operations and may occasionally be operated from the central control room; however, the general practice has been to have an operator at the slusher.

Dust collection in the crushing plant is accomplished by two wet dust collectors with a total of 66,000 CFM. The dust collectors exhaust air is discharged to the upper ventilation system of the mine through an 800 ft. vertical raise and then through mine fans to the surface.

The screening area exhaust system has exhaust hoods with 1500 CFM each above the belts near each of the oversize and undersize ore chutes from the screens. The screens are covered and there are no exhaust hoods on top of the screens. Additional exhaust is from the bin above the screens and tail pulley areas. Total exhaust from this area is 36,000 CFM.

analysis of dust generation and removal methods in jaw

analysis of dust generation and removal methods in jaw

Jaw crusher, which has the advantages of high crushing ratio, easy operation and convenient maintenance, is used in the industries of building, mining and cement, etc. However, during the crushing process, jaw crusher may produce a large amount of dust, which will cause terrible environmental pollution.

With the step by step follow-up of environmental supervision, it is urgent to solve the dust problem. At present, dust removal becomes a common phenomenon in the rocks crushing process, and also be a difficult problem for the mining industry.

Mining dust not only pollutes our environment and harms workers' physical health, but also accelerates abrasion and shortens the service life of jaw crusher. Therefore, it is very necessary and important to control dust.

The dust collecting measure of jaw crusher in the early stage mainly includes two types--spray and dust collecting, and the relevant dust-proof devices are mainly set at the inlet and outlet of crusher. However, the actual dust-proof effect of these methods in the production site is terrible, and the main reasons are:

In the operation of the jaw crusher, the amount of dust generated has an important relationship with the throughput of the ore and the crushing efficiency of jaw crushers. The density of the tooth, the tooth shape and the tightness degree and wear degree of the jaw plate are the important factors that affect the efficiency of crushing.

Usually, there is a screen before the crushing chamber, and only the ore larger than the screen size can enter the crusher. However, under the existing conditions, the screen is very easy to be blocked. If the screen is not cleaned up in time, a large amount of ore will be blocked in the crusher, so that the ore that can pass through the screen without having to be crushed may make the crusher block. Then the ores are crushed repeatedly, which makes the generation of dust increase.

The original jaw plate not only has a small number of teeth but also a large tooth model, which is not conducive to crushing iron ore with high hardness. After analysis and comparison, the jaw plate with three additional teeth may produce less dust in practical application. The crushing efficiency is increased by about 10%, and the amount of dust generated is significantly reduced.

The jaw crusher generates frequent impact loads during the operation. The ore and the jaw plate frequently collide and squeeze. During the crushing process, the fixed jaw plate and the movable jaw plate are prone to loosening or falling off.

Once the jaw plate is loose or detached, the crushing efficiency of the crusher will be seriously reduced, causing the ore to block in the crushing chamber for a long time, and the ore and the jaw plate to squeeze repeatedly to generate a large amount of dust. For this reason, it is necessary to fix the jaw plate frequently and to reduce the generation of dust from the source.

In the past, industrial circulating water was used, not only the water pressure was low (0.2 MPa), but also the water quality was poor, and the problem of insufficient spray volume often occurred. The spray nozzle is also very easy to be blocked, and the bad spray effect has a bad influence on controlling the spread of dust.

At present, the dust-proof system is adopted and the independent pump supply system is applied to reduce the amount of dust emission. The water pressure is adjusting to 0.6 MPa or above, and the spray nozzles with good nebulization and large spray angle are selected.

During the operation of the jaw crusher, the dust is mainly produced in the crushing chamber, and internal pressure and relatively obvious airflow are formed in the crushing chamber and the discharge port. Therefore, the generated dust is mainly discharged from the discharging port.

Therefore, it is necessary to effectively control the main dust-discharging port in order to curb the spread of dust. According to the actual situation of the working site, two spray nozzles can be set respectively at three points, so that it can basically reduce dust by about 70%.

The dust hood of the jaw crusher is adjusted to about one meter from the dust outlet and perpendicular to the dust flow direction, and the fan should be placed at about 1/3 of the front end of the ventilation duct so that the fan can work best.

In the actual production process, the humidification treatment of the ore before entering the crusher can effectively prolong the time of dust separation during ore crushing and reduce the dust generation.

There are many types of dust and different properties. Under normal circumstances, the smaller the particle size of the dust, the less likely it is to settle in the air, and the more difficult it is collected.

As the air flows, it causes long-term and large-scale pollution, which does harm to the human body. In addition, there are even explosive hazards for some flammable mine dust. Therefore, we must take the above measures to prevent it.

With the advancement of technology, the crusher technology has also been upgraded several times. At present, HXJQ has successfully designed and manufactured various types of jaw crushers, such as PE jaw crusher, single toggle jaw crusher and mobile jaw crusher, effectively reducing dust pollution caused by the crushing process.

Besides, HXJQ Machinery also produces cone crushers, mobile crushing plant, etc., with good quality and various models. If you have any problem with machine and crushing, welcome to contact us, and we will do our best to your queries.

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