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Sintering Equipment

In order to ensure uniform iron content in the iron ore supplied to the blast furnace and to ensure the gas permeability of the blast furnace, the iron concentrate produced by the beneficiation process needs to be made into a block material of 10-25 mm. Sintering is an important part of the steel production process. It mixes iron ore fines, powder (anthracite) and lime, blast furnace dust, rolled steel and steel slag according to a certain ratio. Sintered sintered ore with sufficient strength and particle size can be used as clinker for iron making. The use of sintered clinker ironmaking has certain significance for improving the utilization coefficient of the blast furnace, reducing the coke ratio, and improving the permeability of the blast furnace to ensure the operation of the blast furnace.
Our sintering machine is suitable for the sintering operation of large ferrous metallurgy sinter plant. It is the main equipment in the process of exhaust sintering. It can sinter the concentrates and slag powders with different compositions and different sizes, and partially eliminate the contents contained in the ore. Harmful impurities such as sulfur and phosphorus. The sintering machine is divided into several specifications according to the sintering area according to different lengths and widths, and the user selects according to the output or the site conditions. The larger the sintered area, the higher the yield.
The entire sintering process can be roughly divided into three phases:
Low-temperature sintering stage: usually refers to the sintering process below 1000 °C. In actual production, this stage is sometimes used as a separate process. This is usually called "burn-in".
Function: As the temperature increases, the molding agent is gradually eliminated, the oxide on the surface of the powder particles is gradually reduced, the contact stress between the powder particles is gradually eliminated, and carbon is absorbed from the atmosphere (if there is carbon in the atmosphere), etc.
When sintered in hydrogen, the oxide on the surface of the powder particles can usually be reduced below 800 °C. If sintering is carried out in an inert atmosphere, a higher reduction temperature is required, while in a vacuum, a lower reduction temperature is required.
The carbon content of industrial tungsten carbide is usually lower than the theoretical value. If rubber is used as the molding agent, the total carbon content is also lower than the theoretical value. In this case, W2C or W in the tungsten carbide will form an η phase above 800 °C.
High temperature sintering stage: from 1000 ° C to sintering temperature.
If the sintering is carried out in an inert medium, the carbon content of the sintered body does not change at the sintering temperature, and the equilibrium phase composition is determined only by the original composition of the sintered body. However, the sintering medium is often not inert, so the carbon content of the sintered body will change more or less with the increase of the holding time: either increase or decrease, resulting in changes in the liquid phase composition, and even forming a new phase (η phase Or graphite), or change the number of new phases. The phase composition before solidification of the sintered body is determined by the final carbon content: if the amount of carbon is insufficient, it is WC++ liquid phase; if the amount of carbon is excessive, it is WC+C+ liquid phase; if the amount of carbon is excessive, it is WC+ liquid phase.
Cooling stage: from sintering temperature to room temperature.
It can be seen that the microstructure and properties of the alloy are mainly determined by the results of the first two stages of sintering, while the effect of cooling rate is small.
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