Steel, iron analysis with cold solid pellets feasibility I. Project Overview 1. With China's steel production continues to rise, the demand for the charge put forward higher requirements, reasonable charge structure more attention by the major steel companies, along with the growing tension mineral resources, along with the secondary iron and steel enterprises produced iron resources (sintering dust, blast furnace dust, converter steel, iron oxide and other iron-containing materials) these iron-containing material iron content up to 40%, some companies will be part of sintered iron-bearing dust return to use, but because of the with ordinary binder material is difficult to shape, resulting in performance into a ball, sinter quality, permeability are lower than the blast furnace applications, can only put scrapyard accumulation, both caused by environmental pollution and waste of resources. How to improve the "resource utilization, optimize charging structure, improve the metallurgical properties of the pellets" to solve the existing cold-pellet binder quality and re-use of iron-bearing dust powder, to achieve a virtuous cycle of development of the enterprise. Second, according to the project made under the Ministry of Metallurgy "Plan" Environmental Plan requires that "utilization of iron-bearing dust" as a national research projects. Third, metallurgical slag and iron-bearing dust pellet binder project developed by our company pellets binder is the use of polymer chemicals, catalysts, surfactants, etc. dispositions. 1. Polymer pellet binder (pure gum), materials containing less than 2%, down 0.3% taste, warm water system, able to penetrate with the water, when mixed with other substances, dispersion, penetration is very strong, help Tuomo increase pellet production, when the colloidal water evaporation, the colloidal particles can be firmly attached to the surface, forming a strong bond, can improve the compressive strength of the pellets, reduce the coefficient of expansion of pellets. Compressive strength ≥2000N 1. Composite pellet rapid adhesive (material moisture content of less than 6% shall be added 5-8% desiccant / ton, hot water modulation) particles can quickly fill in the gaps in the material particles, because the raw plastic ball surface to form a hard shell, when students receive the ball will not impact crusher, increase green ball drop strength. Compressive strength ≥2000N. 2. Rust pellet binder (material moisture content of less than 5%, cold water modulation) The binder is prepared from raw materials in chemical industry, is cold-pellet produce a chemical reaction, the pellets consolidation, oxidation, dry, lower grade pellets. Pellets must be added 5-10% raw iron. Compressive strength ≥1500N. 3. Coke breeze and non-metallic powder forming the binder, the binder has heat resistance (1000 ℃), forming high strength, less than 0.3% lower fixed carbon, chemical activity. Compressive strength ≥1000N, drum ≥75%. Fourth, with the role of cold-steel pellets and use 1) cold-pellet control alkalinity during the smelting operation, with the role of shop help desulfurization, dephosphorization, deoxidation, decarburization, can reduce the amount of lime can be Alternatively fluorite, ore, reducing the amount of scrap used. 2) by adding the amount of cold-pellet was 25 kg / ton. 3) add time, add half the normal added minerals, twice the addition was complete, or graded by adding small quantities. 4) Any added steel. Fifth, the process 4. Cold-pellet composite slagging agent is integrated converter production slagging need to converter mud, dust and ash as the main raw material, other iron and other raw materials with addition of iron oxide generated in the process of rolling-induced, the desired proportions of ingredients ( After drying oven to remove moisture), added to the mixer mixing, adding a binder stirring, the pressure of the ball machine pressed into balls and stored for about two hours (lower raw material drying conditions), naturally cured and dried. The resulting cold-pellets have uniform size, high strength, good metallurgical performance characteristics, cold-pellet conveyor belt in the car transport and process will not cause the powder. Six steel-making role of cold-pellet 1. Iron pellets by cold-containing material using internal production process emissions, the development and utilization of iron powder sinter quality meet or exceed the standards can be simplified to "blast furnace raw material mix Act" process. It can shorten the refining time, but also save energy. Lower production costs, both to increase hot metal production. Improve blast furnace utilization coefficient, and reducing environmental pollution. Have a good social and economic benefits, more environmentally friendly. 2. Cold-pellet, high iron content, particle size uniformity ,, high porosity conducive to high charge column permeability and improve airflow evenly distributed, restore good performance. Dezincing desulfurization rate is high, both to meet the production requirements of blast furnace, instead of natural high-grade ore and sinter, coke can be significantly reduced. Reduce the heat and reducing the amount of carbon consumed. 3. Cold-reduced sintering pellets, cold solid pellets in a sintering furnace smelting. A substantial increase in blast furnace production, improve gas utilization, simplify blast furnace production process. 4. High cold-pellet strength, no crack and chalking in the smelting process. 5. Due to cold-iron pellets, high strength (compressive and you wear) and a large bulk density, help to increase the effective weight of the blast furnace column, shorten smelting time granularity for iron requirements. 6. Cold-pellet use of additives, does not contain harmful ingredients blast furnace. Thus, according to the classification analysis concluded that the application of cold-pellet blast furnace, BOF production, not only to meet production needs, and be able to withstand some economic benefits, it will be cold-pellet for converter , EAF, blast furnace iron production is feasible.