Ingredients purpose, requirements and method of ingredients
In order to stabilize the chemical composition and physical properties of sintered ore, to meet the requirements of the blast furnace, and the frit has sufficient permeability to achieve higher productivity of the sintering, must be iron-containing raw materials, flux and fuel components according to various The requirements of the sintering process and the quality of the sintered ore are precisely compounded. The practice of sintering production proves that the deviation of the sintering ingredients will affect the progress of the sintering process and the quality of the sintered ore. For example, under the condition of a certain plant, the limestone ratio error of 1% affects the alkalinity of the sintered ore by 0.04; the fuel fluctuation is 1%, which affects the change of FeO in the sintered ore by 2 to 3, which affects the reduction and strength of the sintered ore.
There are many varieties of sintering raw materials, and the fluctuation of the composition is large. Before entering the batching room, it must be crushed, sieved, neutralized and mixed, and then calculated according to the requirements of the chemical composition of the sintered ore to ensure the iron content of the sintered ore. The main components such as alkalinity, sulfur content and FeO content are controlled within the specified range, and design data is provided for equipment selection, tank design and transportation system.
The accuracy of the ingredients is determined to a large extent by the method of compounding used. Current dosing methods have volumetric ingredients and quality (weight) ingredients.
At present, the disc feeders widely used in various factories are one type of volumetric ingredients. It is based on the assumption that the bulk density of the material is constant, and the volume of the batch is controlled by the gate of the sleeve. In order to increase its accuracy, it must be checked regularly. Since the bulk density of various raw materials fluctuates depending on the pellets and humidity, the batching amount causes a large error, generally more than 5%. In terms of increasing the accuracy of disc batching, each sinter plant has accumulated a wealth of experience. For example, when the disc feeder is installed, the center of the feed disc should be matched with the center of the silo to maintain a certain height of the silo. And distribute the material evenly in the silo to prevent the materials from being stacked on one side. Keep the disc face with the same roughness in all respects. In some sinter plant batching rooms, in order to ensure the chemical composition and particle size of the mixed minerals, the trapezoidal feeding method is adopted. That is, four mixed mining bins use three, one is full warehouse, one is half warehouse, one is lower warehouse, and the other is for conveying. The sample is sent after the input is completed. Generally, the size of the feedstock is fine and large when the warehouse is full. The feedstock is coarse and light in weight at the bottom. In addition, in order to correctly check the amount of material, a three-point line method is adopted: that is, the red line on the disk, the center point of the disk, and the center point of the belt is on a line. The red line on the disc is a representative point based on prior measurements.
Since the volumetric batching method is simple and easy to operate, it is currently widely used, especially in small and medium-sized enterprises.
The weight (quality) compounding method is based on the weight (mass) of the raw material. It is accurate in the batching accuracy of about 1.0% than the volumetric compounding method, and is more obvious for the fuel with a smaller proportion. In addition, weight (quality) dosing can automate ingredients. Many factories install electronic scales under the disc feeder to reflect the amount of feed in time. In addition, the slip motor speed is installed on the feeder to ensure the accuracy of the feed. The figure above shows the automatic batching system of a factory sintering workshop. The iron concentrate is weighed from the electrons on the collecting belt to obtain the concentrate signal, compared with the set value, and the speed of the 4 or 5 (disc feeder with speed regulating motor) is adjusted by the regulator to Keep the amount of concentrate unchanged. At least one of the No. 4 and No. 5 runs during operation. The dosing of the auxiliary material is adjusted by the dosing machine and the respective adjustment system to adjust the feeding speed of the belt conveyor. The ratio given system is realized by the adjustable constant current unit and the calibrator. This configuration increases equipment and saves power consumption. The accuracy of concentrate ingredients is 1.5%, and the auxiliary ingredients are 1.0%.
At present, there are already chemical ingredients in foreign countries. In this method, the chemical composition of the raw materials is analyzed by an X-ray fluorescence analyzer, and the optimum ratio of each material is determined according to the chemical composition.
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