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(1) Reduce the rate of burnout of the purlins. Under normal circumstances, the consumption of purlins is 0.03 to 0.1 kg per ton of sintered ore. The consumption of the bars has a certain impact on the cost of the sinter.
(2) Maintain a fixed effective ventilation area. When the primer is not laid, the sinter may stick to the crepe to reduce the suction area, and the sintered material of the bonded portion is not burnt well, thereby reducing the yield of the sintering machine and increasing the return rate. In order to avoid sticky sticks, some factories adopt a method of not burning, but this will affect the quality of the sintered ore.
(3) Extend the life of the exhaust fan rotor and increase the operating rate of the sintering machine. During the exhaust sintering process, fine ore particles are drawn into the bellows with the exhaust gas, pass through the large flue, enter the exhaust fan, and accelerate the wear of the rotor blades. This situation is even more serious when using all concentrate powders to be sintered, and some plants are worn out in less than a few weeks. After the bottoming material is laid, part of the fine ore powder is blocked, and the amount of ore powder carried by the exhaust gas is greatly reduced, thereby prolonging the life of the exhaust fan and correspondingly increasing the operating rate of the sintering machine.
(4) Improve the sintering operating conditions and facilitate automatic sintering control. The production practice proves that when the bottoming material is not used, the sintering machine trolley returns more material under the lane, and a special cleaning device is required. After the bottoming material is used, the trolley material of the trolley is basically eliminated, and no special cleaning device is needed, which is convenient for automatic control of the sintering machine.
The cooled sintered ore is sieved twice to obtain a primer. Some foreign factories use 8 to 15 mm or 10 to 15 mm of finished ore as the bottoming material, >15 mm for the blast furnace, and <8 to 10 mm for the returning ore. This method requires 1) to establish screening equipment , 2) a special system to send the primer to the high point of the sintering plant, and 3) to add a bottom storage tank. Practice has proved that as long as the design is reasonable, this method will not affect the operating rate, and can reduce the loss of the purlin by 30-50%, greatly extending the life of the exhaust fan rotor. In addition, the quality of sinter production has improved, which is an important part of China's sintering technology transformation. 
The role of the primer and the method of obtaining the primer
There is still a part of the sintering machine in China that does not have a bottoming system, and the sintering material is directly laid on the furnace bar. When the ribbon is reached under the sintering belt, the high temperature exhaust gas of the sintering belt may burn the crucible or adhere the molten liquid phase to the grate. Therefore, a layer of fuel-free charge should be placed between the sintered material and the bar, called the primer. The main role of the primer is four points: