Silica-barium inoculant is used as inoculant for casting and deoxidizing agent for steelmaking. In casting as inoculant, it can promote the formation of A-type graphite, refine the eutectic mass, improve the distribution of graphite, have strong anti-decay ability, eliminate and prevent the white hole tendency of castings, and reduce the section sensitivity. When silica-barium inoculant is used in steelmaking as deoxidizer, it has no smoke, no spark, higher deoxidation effect than silica-calcium alloy, and can improve the form of non-metallic inclusions and improve the quality of steel.
Silicon barium inoculant application industry:
Silica-barium inoculant is a composite multi-component alloy made by artificial smelting. The silicon element and barium element in silica-barium inoculant can be matched and combined in a targeted ratio to meet the requirements of steelmaking or casting. Silica-barium inoculant is a massive metallurgical material made by blending silica powder with barium powder in proportion to demand and then making steel in high temperature furnace.
Silicon-barium inoculants are widely used in metallurgy, machinery industry, additives of iron, steel and non-ferrous metals and alloying agents, reduction degassing and purification, in order to improve the mechanical properties and application effects of materials. Silica-barium inoculant reduces the casting process of high manganese slag, changes the mechanical properties and refines the grains.
Silicon barium inoculant production method:
At present, the current production of silica-barium inoculants generally adopts the production of ferrosilicon in the ore furnace, and then the ferrosilicon and barium-containing raw materials are added to the medium frequency furnace. Silica barium inoculant replaces 75% ferrosilicon as inoculant, and its economic benefits will be huge.
The silicon barium inoculant is smelted in the ore furnace at one time, and the process is carried out on the basis of smelting 75% ferrosilicon. In the production of this product, first of all, the original production of 75% ferrosilicon furnace condition is normal, the content of aluminum should be controlled below 2%, the barite, limestone, calcium carbide proportionally mixed evenly, respectively placed in the furnace against the three electrodes, and then mixed with 75% ferrosilicon material evenly. Within 1.5 hours of each iron discharge (every 2 hours of a furnace iron), the above mixed charge is evenly added to the furnace in batches and stages, and it should be prevented from burning when smelting. The furnace building, opening and stopping process is the same as 75% ferrosilicon process.
Silicon barium inoculant process flow:
The qualified coke, silica, steel chips, and KG are mixed, and then the mixture is supplied to the furnace platform. The mixture is mixed with barite, limestone and radio, and then added to the molten iron ingot to be smelted in the electric furnace, and the chemical composition is analyzed by sampling. The qualified products will be finished and crushed, packed and stored, and the unqualified products will be smelted again. Silica barium inoculant raw material composition of barite 10-400 kg, silica 500-600 kg, calcium carbide 0-50 kg, coke 450-550 kg, steel filings 65-85 kg, limestone 5-10 kg.
The requirements for the above raw materials silica, coke, steel chips and smelting 75% of ferrosilicon raw material requirements are the same, barite to contain BaSO4 greater than 70%, particle size 40-60m/m, no soil, no inclusion, good knock resistance, limestone CaO greater than 51% particle size 30-40m/m, calcium carbide containing CaC2 greater than 70%, Particle size 30-40m/m unpulverized, the chemical composition of barium silicate inoculant ranges from Ba0-30%Si0-70%, Ca0-4%, Al less than 2%.
In the case of no need to add new equipment, the silicon-barium inoculating agent can be produced in the mineral-thermal furnace, which significantly reduces the unit power consumption from 14,000 degrees per ton to 8600 degrees, and the product cost is greatly reduced, the amount of silicon-barium inoculating agent is only one third of 75% of ferrosilicon, and the casting quality is improved. Solve the problem of uneven strength caused by large wall thickness difference and the incubation recession caused by production layout restrictions and casting process length, and improve product quality.