Mechanical sintering of sinter

1. Sintering is a method of heating powdery materials (such as fine ore and concentrate) at high temperature and sintering them into blocks under the condition of incomplete melting. The proct is called sinter, and its shape is irregular and porous. The heat energy required for sintering is provided by the combustion of the carbon in the sintering material and the excess air, so it is also called oxidation sintering. Sinter mainly depends on liquid phase bonding (also known as melting sintering), solid phase bonding only plays a secondary role
modern sintering proction is a process of exhaust sintering, in which the mixture (iron ore powder, fuel, flux and return ore) is mixed with an appropriate amount of water, mixed and granulated, and then spread on the grate of belt sintering machine. After ignition, a certain negative pressure is used to exhaust air, so that the sintering process can be carried out from top to bottom. The sinter is unloaded from the sintering trolley. After crushing, cooling, granulation and screening, the finished sinter, return ore and bedding material are separated< The typical sintering proction process can be divided into eight process systems:
1) the receiving process system mainly includes mper system, receiving tank, concentrate warehouse, flux warehouse, fire extinguishing warehouse, etc., which is responsible for the receiving, transportation and storage of incoming raw materials
2) raw material preparation process system includes neutralization of iron containing raw materials, crushing of fuel, crushing and screening of flux. Its task is to prepare raw materials, flux and fuel that meet proction requirements for batching process
3) batching process system, including ore trough, disc feeder, weighing facilities, etc; According to the specified sinter chemical composition and the type of raw materials used, through calculation, each raw material is fed according to the calculated weight, so as to ensure the stability of chemical composition of mixture and sinter and the adjustment of fuel quantity
4) mixing and granulating process system mainly includes cold and hot return plate and primary mixing; Mixture ore tank, secondary mixing and other processes. Its task is to add water and wet the mixture, then mix the mixture evenly with the primary mixer, and preheat the pellets with the secondary mixer
5) sintering process system includes bedding, distribution, ignition, sintering, etc. The main task is to sinter the mixture into qualified sinter
6) the ventilation system includes bellows, st collecting pipe, st collector and fan. Chimneys, etc
7) the finished proct processing system includes hot crushing, hot screening, cooling, cold crushing, cold screening and finished proct transportation system. The task of this process is to separate 5 ~ 50mm finished sinter, 10 ~ 20mm bottom material, less than 5mm cold return ore
8) the environmental protection st removal process system is mainly to use the electrostatic precipitator system to purify the waste gas from the st points of the sintering machine tail discharge, hot screen, cooling, ore return and whole grain system. After being purified by the precipitator, the waste gas is discharged into the atmosphere. After being wetted, the st is added into the sintering mixture for sintering. Its task is to protect the environment of sintering proction
in some sintering plants in our country, the process is not perfect, some of them have no cooling, cold crushing and cold screening operations (called hot ore plants); Some of them have cooling effect, but no cold breaking, cold screening and bedding effect. In the more advanced sintering process of Baosteel, the raw material receiving, flux crushing, screening and neutralization of iron bearing raw materials are carried out in the raw material yard, and the iron bearing raw materials are mixed into a single and stable mixture by the raw material yard and directly sent to the sintering batching tank.

2. The manganese ore used in the process of procing silicon manganese alloy by submerged arc furnace should be screened. The screened ore powder can not be directly fed into the furnace, but can be converted into sinter by sintering and briquetting with sintering machine. In this way, the reasonable utilization of ore powder can improve the structure of ore fed into the furnace, and the sinter is clinker fed into the furnace, which can rece the power consumption of smelting in submerged arc furnace and speed up the smelting process. If there is sintering machine in the raw material system of submerged arc furnace smelting, manganese ore powder can be directly imported from abroad for sintering, which not only reces the cost of raw materials, but also benefits the furnace condition.

3. It is mainly suitable for sintering treatment of iron ore powder in large and medium-sized sintering plants.

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The basicity of sinter is not the best, as long as the basicity is appropriate, it is good, that is, the basicity is suitable for the needs of blast furnace burden structure. In the case of higher basicity, it is beneficial to the strength of sinter, but it will affect the grade of sinter and rece the smelting strength of blast furnace. In the case of lower basicity, the sinter proportioning of blast furnace decreases, the pellet proportioning increases, and the charging grade increases, which is good for blast furnace

in a word, there is no best, just to see the needs of blast furnace proction, all for the high proction and smooth operation of blast furnace

the following is about sinter and basicity:

sinter

also known as basicity. It refers to the molar ratio of hydroxyl group to aluminum in the compound. The symbol B is generally used to represent alkalinity%. It is an important quality index of basic aluminum chloride, which directly determines the chemical structure and many characteristics of the proct, such as polymerization degree, molecular charge number, coagulation capacity, storage stability, pH value, etc