Ordering Of AG Φ12.2×11m Discharge Grid Liner Added To Sino Iron Ore

1.AG Φ12.2×11m Mill Structural Design Of Discharge Grid Liner

 

Original AG Φ12.2×11m Mill Dischager Head Liner	Original Grate Liner	Original Refractory Window Grate Liner

                                                                   

New design of grid liner with spiral lifting strip structure-1	New design of grid liner with spiral lifting strip structure-2

2.AG Φ12.2×11m Mill Manufacturing Of Discharge Grid Liner

 

Casting Of New Structure Grate Liner -1	Casting Of New Structure Grate Liner -2
Special Heat Treatment Tooling For New Structure Grate Liner-1	Special Heat Treatment Tooling For New Structure Grate Liner-1

3.Application Effect Of New Structure Grate Liner

 

Installation and Application Effect of New Structure Grate Liner-1	Installation and Application Effect of New Structure Grate Liner-2

Recently, it is reported from Sino Iron Mine in Australia that the AG Φ12.2×11m discharge grid liner reconstructed by our company for Sino Iron Mine has good application effect, the qualified rate of mineral discharge particle size has been increased by more than 2%, the service life has been increased from the original 9 months to 1year, the downtime has been reduced, and the annual iron ore processing capacity has been increased by about 200000 tons, which has been highly recognized by users.
The ore belongs to low-grade magnetite. The average hardness of the ore is f =7-10, which belongs to medium hardness mineral. There are many hard stones in the minerals entering the autogenous mill, so 12 hard stone grate of 40mm and 60mm are set in the 36 discharge grid liners around the whole circumference, and the normal discharge grid liner grate hole is 20mm. In this way, the structure of the discharging part not only discharges the hard rock, but also causes the increase of the returned materials, which reduces the efficiency of ore treatment. For this reason, the user fills about 8% of the Φ125 steel balls to enhance the crushing effect of the ore and hard rock, and improve the productivity and crushing effect. In the process of using the discharge grid liner of the original structure, due to the impact and wear of ore and steel ball on the lifting bar of the grid liner, the grid liner is premature failure, resulting in accelerated wear and grid hole deformation and blocking, which affects the production capacity and discharge effect. With the mining, the hardness of ore decreases and the content of boulder decreases. The design structure of the original discharge grid can not meet the needs of crushing and grinding in terms of service life and discharge particle size,
Therefore, in October 2019, we redesigned the AG Φ12.2×11m discharge grid liner. The whole circumference is still 36 liners, the grid hole is changed to 40mm wide, the lifting strip is changed to spiral type, and each grid liner is distributed with 3 lifting strips
1. It is appropriate to increase the discharge capacity and particle size of grid plate when the grinding capacity and particle size of Φ7.9×13.6m ball mill meet the standard.
2. The grid liner lifting strip is in the form of spiral distribution, so according to the design of mill rotation direction, the discharge particle size can be effectively classified, the number of lifting strips can be increased, the impact and wear of steel balls and minerals on the grid liner can be reduced, and the service life of liner can be extended as much as possible.
3. Because the impact and wear of steel balls and minerals are reduced, the size deformation of lattice holes is reduced, the ore discharge efficiency and particle size are relatively stable, the time of  AG mill shutdown inspection and cleaning is reduced, the production capacity is improved, and the lattice plate and cylinder liner can be replaced at the same frequency.
4. The lattice liner is still CrMo alloy. The micro alloying treatment, normalizing heat treatment process and heat treatment tooling are adjusted to comprehensively improve the strength and toughness of the lattice hole.
We plan the design, casting, heat treatment, installation and other aspects of the grid liner to achieve the ideal effect. In January 2020, the new structure grid liner will be installed and used, and will be replaced in January 2021. The design idea of the improved grid liner is correct, the manufacturing process is reasonable, and the assembly is accurate and convenient. Next, users require this design and process to supply lattice liner products for subsequent AG mills.