Practice of ore dressing in Dagushan Concentrator of Anshan Iron and Steel Co., Ltd.

B chemical composition and mineral composition

The element for ore recovery in the ore is iron, the iron mineral is mainly magnetite, followed by limonite and hematite. The gangue mineral is quartz and a small amount of amphibole, chlorite, calcite and the like.

The analysis results of ore chemical composition and iron chemical phase are shown in Table 1 and Table 2.

Table 1 Chemical composition analysis results

Table 2 Phase analysis results

3 Technical progress

Since 2004, the beneficiation process of the Dagushan Pellet Plant has carried out the upgrading of new iron and silicon-reducing processes and new equipment. After the transformation, it has formed an annual capacity of 9 million tons of raw ore. After that, the plant has undergone a series of technical transformations. Significant economic benefits.

(1) After the high-efficiency technical transformation of the φ53m thickener of the pellet plant, under the premise of meeting the capacity of processing 9 million tons of raw ore, less 5 φ53m large wells will be built, saving 10 million yuan, and improving the overflow quality of tailings thickener .

(2) In January 2005, the magnetic separation workshop of the concentrator was optimized to adjust the process and equipment structural parameters of the grinding and grading operations, and the ball mill was treated under the premise of maintaining stable operation of the first and second stages of grinding and grading operations. The amount increased from 128t/h to 132t/h, and the annual profit increased by 23.814 million yuan.

(3) The φ350mm cyclone unit of the ore dressing plant was transformed into two φ500mm cyclones. Under the condition of the same capacity, the overflow particle size and classification efficiency of the φ500mm cyclone were better than the φ350mm cyclone. More importantly, the application of φ500mm cyclone significantly reduces the clogging phenomenon of the grit chamber, improves the processing capacity of the mill, stabilizes the process index, and further reduces the grinding cost.

4 Production process and process

A Process Introduction

The processing process of the Dagushan pellet plant is divided into two parts: the main plant and the beneficiation branch. The main plant is mainly composed of three parts: crushing, magnetic separation and three-selection. The process is as follows: The process of crushing is three sections, one closed circuit, and the middle break. Pre-screening process. The process used in the magnetic separation workshop is the stage grinding-単-magnetic separation-fine screening regrind process; the process adopted by the three-selection workshop is continuous grinding-single magnetic separation-fine screening regrind process; beneficiation branch The process adopted by the crushing system is a three-stage and one-closed process, and the sorting process uses a stage grinding-single magnetic separation-fine screening regrind process.

B broken, sieved

From 2004 to 2007, the beneficiation process of the Dagushan pellet plant was carried out to upgrade the new technology and new equipment for iron and silicon reduction. After the transformation, the ore processing plant processed 9 million tons of raw ore annually. In the crushing workshop, the original coarse crushing is retained, and the new main building is finely broken and sieved. The crushing main equipment adopts Swedish H series cone crusher, and the screening equipment adopts double-layer vibrating screen. The crushing feed size is 1000~0mm, and the product granularity is 12~0mm.

a main plant crushing and screening process

The existing main plant crushing screen is divided into three sections and one closed circuit in the pre-screening process before breaking. The coarsely broken ore discharging product is sent to the medium and crushed and pre-screened by the belt, and after being sieved by the fixed rod sieve, the sieved material is broken into the broken machine, and the broken ore discharging product is transported together with the pre-screened sieved object. The sieve compartment is sieved into the vibrating screen through the feeder, and the product is sieved into the fine broken mine bin. The belt feeder is used to crush the fine crusher and can be discharged into the open storage tank. Storage; finely broken ore products are transported to the screening room for screening. The sieved and screened products are respectively fed into the original ore bin of the magnetic separation workshop and the original ore bin of the three-choice workshop, and can also be stored in the powder ore bin. The main plant crushing and screening process is shown in Figure 1.

See Table 3 and Table 4 for technical parameters and indicators of the main plant crushing and screening equipment.

Figure 1 Main plant crushing and screening process flow chart

Table 3 Technical parameters and indicators of the main plant crushing equipment

Table 4 Technical parameters and indicators of the main plant

C Grinding classification

In 2004, the magnetic separation operation area was carried out to upgrade the new technology and new equipment for iron and silicon reduction, and the factory was cancelled. First and second grinding use large-diameter grinding machine, the first and second grading adopt dynamic pressure feeding ore cyclone, which makes the raw ore processing volume and overflow product granularity greatly improved. Following the technological transformation in 2004, in October 2005, the three-selection process was continuously modified and improved, and the φ500mm x5 cyclone 2 group was replaced, and the product granularity was also improved.

The technical indicators of grinding classification are shown in Table 7.

Table 7 Grinding classification technical indicators

D sorting process

a Magnetic separation work area process

The magnetic separation workshop adopts a stage grinding-single magnetic separation-fine screening regrind process. The ore is fed into a ball mill , and a cyclone constitutes a closed circuit. The overflow enters a magnetic separator to remove the tailings. The concentrate is secondly graded by a secondary cyclone. The coarse-grained product enters the second-stage ball mill and discharges the ore. Return to the magnetic separator; the secondary graded fine-grained product is fed into the dewatering tank, the concentrate is fed into the secondary magnetic separator, the concentrate is given to a vibrating screen, and the sieved product is fed into the three dewatering tanks for sorting. The sieved material is concentrated into a dehydration magnetic separator. The concentrated product is given to a three-stage ball mill. The product is given to a secondary dewatering tank. The concentrate is fed into a three-stage magnetic separator. The concentrate is fed into the second-stage vibrating screen. Screening, the sieved material enters the dehydration magnetic separator, the sieved product is fed into the three dewatering tanks for sorting, and the concentrate is given to the filtration workshop. The process is shown in Figure 2.

Figure 2 Magnetic flow control area process flow chart

b Three-selection work area process

The three-selection operation area is a two-stage continuous grinding process—a magnetic separation process—a fine screening and regrind process. The original ore is given to a ball mill, and the double-spiral classifier forms a closed-circuit grinding system. One stage of overflow is fed into the cyclone, and the second-stage ball mill forms a closed circuit. After the secondary overflow is fed into the magnetic separator, the tail is passed. The dewatering tank is tailed, the concentrate is fed into the secondary magnetic separator, the concentrate is given to a vibrating mesh screen, the sieved product is fed to the dewatering tank for sorting, and the sieved material is fed to the dehydration magnetic separator for concentration, and the concentrated product is concentrated. It is sent to the ball mill for the third stage of grinding. The ore discharge product is fed into the secondary dewatering tank. The concentrate is given to the third magnetic separator for sorting. The concentrate is fed into the second section of the vibrating screen and the sieve is returned to the dehydration magnetic separator. After the first and second sections of the vibrating screen are combined, the products are given to the three dewatering tanks, and then the magnetic separator is given four times. The concentrate is fed into the four dewatering tanks for sorting. The concentrate is fed into the filtering workshop. As shown in Figure 3.

Figure 3 Three-selection work area process flow chart

The main equipment of the concentrator is shown in Table 22-6-8 ~ Table 22-6-10.

Table 8 Magnetic separation work area equipment table

Table 9 Three-selection work area equipment table

G 1990~2008 main technical indicators

The main technical indicators from 1990 to 2008 are shown in Table 22-6-13.

Table 22-6-13 Main technical indicators of Dagushan Concentrator from 1990 to 2000

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