Nylon shocking fine screen

The nylon slamming vibrating screen is a fine-grain screening device successfully developed in the mid-1970s. It has achieved good results by using it to improve the grade of magnetically selected iron concentrate. After the use of magnetic separation plant promotion, China's magnetic separation iron concentrate grade has reached the world's advanced level.
Structure
The structure of the nylon vibrating screen is shown in the figure below.

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The figure above shows a 400×1200mm self-flowing ore fine sieve for testing. It can be seen from the above figure that the fine sieve structure is simple, mainly composed of a feeder, a sieve surface, a sieve frame, a sieve body and a striking device. The upper part is a feeder, and the lower part is a sieve body welded by steel plates, which is provided with a screen frame and a screen surface, and a tapping device is arranged behind the screen frame. The feeder is composed of a buffer tank and a homogenizer. The buffer is controlled by a valve to maintain the constant pressure inside the tank and adjust the amount of ore. The slurry flows to the homogenizer and flows evenly through the screen surface and is divided into two products, the sieve and the sieve. The sieve surface is a sieve with a long hole and is made of a fixed sieve or sieve. The arrangement of the screen bars is perpendicular to the direction of the material. The screen surface is mounted on the screen frame, and the screen frame is suspended by the spring on the screen body, and the screen body and the horizontal support are inclined, and can be adjusted. There is a striking plate on the back of the screen frame, and the striking hammer of the striking device periodically strikes the plate to cause instantaneous vibration of the screen surface to prevent the screen hole from being clogged. The tapping mechanism (below) is controlled by a DC motor and a cam machine to adjust the tap height and number of times. Industrial test A fine screen uses a single motor to drive 15 beaters in series.

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The striking device has been improved, and the improved striking device is shown below.

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2. Technical performance
The technical characteristics of the 400×1200mm nylon shock-absorbing fine sieve are:
Screen size (length × width) 400 × 1200mm
Sieve angle
One section of 55 degrees, two sections of 60 degrees, mesh size 0.2mm
Dimensions First paragraph (15)
(length × width × height) 8.5 × 2.5 × 2.3 m
Second paragraph (12 links)
7×2.5×2.3m
Separation size 200 mesh Under the sieve -200 mesh content is about 95% Processing capacity 5~8t/set•h
Feed concentration 35~45%
The yield under the sieve is about 50%. The weight of the hammer is 200~250mm.
Number of beats 6 to 21 times / min
Motor power 2.8kW (DC adjustable)
Application example
The fine sieving is mostly used in the fine sifting and regrinding process. The first is the application in the fine sieving and re-grinding process, and the first is applied in the fine sieving and separate regrind process. In order to fully exploit the secondary grinding ability, the previous process 1 is often used when the return amount on the fine sieve is not more than 30%. For the case where the processing of the inlaid cloth is fine, and the second-stage grinding load is originally large, In order to improve the concentrate grade, the latter process is used.
Before the fine screening application, the Nanfen Iron Ore Selection Plant used a single wet weak magnetic field magnetic separation process. After the fine sieving is applied, it becomes a magnetic separation and fine screening combined process of fine screening and re-grinding. (The following figure). [next]

The following table shows the comparison of production indicators before and after fine screening in the three-choice workshop. From the 32-month production index from 1976 to 1978, it can be seen that the concentrate grade is increasing year by year, the mill capacity is decreasing year by year, the average concentrate grade is increased by 1%, and the mill capacity is reduced by 3~5t/set•h. After the fine screening was put into production, this situation was changed. From the 21 months of 1980 in 1980 to the 32 months before the start of production, the concentrate grade increased by 2.61% and the ore processing capacity increased by 2.69t/set•h under the conditions of similar magnetic properties and ore grades; In 1979, compared with 1977 before the production, its magnetic rate, ore grade, and tailings were almost equal, while the iron concentrate grade was increased by 2.48%, and the mill capacity was increased by 5.41 t/set•h. It can be seen that the application of fine screening has achieved significant effects in improving the grade and yield of iron concentrate. The 18-month production statistics after the second-selection workshop was put into production, the concentrate grade was 2.719% higher than before the production, and the mill capacity was increased by 15t/set•h. [next]

The fine screening of the Dashihe plant is used to treat the magnetic concentrate of the second-stage fine-ground magnetic separation. The equipment connection diagram is shown in the figure below.

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The results of the two process comparisons obtained from the production review are listed in the table below. The fluctuations in grades are shown in the figure below.