Changgang Flux Factory: Provide “calcium” for steelmaking
The entry rate of activated block ash calcium oxide content in a narrow range has increased from 17.84% on February 20 to 64.90% on October 20. This data records that Shougang Changgang Flux Plant has taken the index upgrade as the starting point to serve the next level. Process is the purpose, overcome difficulties, and provide guarantee for making steel with all efforts.
To make good steel, firstly make good slag. The raw materials are the basis of steelmaking. Good raw materials can greatly improve the efficiency of steelmaking and the quality of molten steel. Activated lime is a kind of high-quality light burnt lime, the main component is calcium oxide, the stability of calcium oxide content directly affects the effect of steelmaking and slagging: on the one hand, calcium oxide can quickly melt with molten steel in a short time It is the most used slagging material in oxygen top-blown converter steelmaking; on the other hand, providing “calcium” for steelmaking can reduce the rate of lime powder and reduce the consumption of lime, thereby reducing the consumption of steel materials and speeding up the slagging rate. , To achieve better desulfurization and dephosphorization effects. According to calculations, for every 1 kg/ton of slag consumption reduced, steel material consumption is reduced by about 0.20 kg/ton.
For a long time, the key factors affecting the stability of calcium oxide in the plant are: the conventional calcium oxide content detection process is many, the result is slower, when the production fluctuates or is affected by the outside world, it cannot be adjusted in time according to the product quality, and the process control is lagging. The calcium oxide content of active lime fluctuates greatly.
In order to guide cadres and employees ideologically, the factory combined with the company’s “Learning from Pakistan Steel Experience and Promoting Index Improvement” activities to launch a discussion activity on “Being a Pursuing Worker, Be a Pursuing Enterprise” among all employees to guide cadres and workers. Establish a sense of service and provide production “calcium” for steelmaking from the source. They actively learn from the management method of “full-staff production and maintenance”, with the goal of full-staff participation, and work hard to create an atmosphere. The plant organizes key positions to conduct skill competitions to improve the ability of employees to visually detect the calcium oxide content of the activated block ash, which lays the foundation for early adjustment, diligent adjustment, and fine adjustment.
In order to increase the entry rate of the activated block ash calcium oxide content in a narrow range, the flux plant held several special meetings to conduct a comprehensive analysis and discussion on raw materials, gas, air volume, process control, finished product storage, etc., and formulated control measures.
Considering that the color of the raw limestone and the finished active block ash are obviously different, the surface phenomenon of the active block ash can be analyzed and judged. However, in daily operation, the staff of the factory adopts the visual inspection method for the calcium oxide content of the active block ash. Jagged. How can we reduce empirical judgments and seek a more scientific and reasonable method to accurately determine the calcium oxide content of activated block ash, and play a guiding role in process control?
In the process of solving the problem, the technicians of the plant thought that the cement industry, which is also in the inorganic and non-metallic field, also uses rotary kilns for clinker calcination, so they learned that cement clinker has an important indicator of “liter weight”, and used “liter weight”. “Barrel” measures the weight of clinker per liter to judge the quality of the clinker. Active lime is produced by calcining the raw material limestone. The volume of the material will not change during the whole process, but the mass is lighter by about 44%. Considering this difference, the technicians of the plant believed that the “lifting weight cylinder” practice of the cement industry had great reference value, and immediately purchased sampling barrels and hook scales to carry out the “lifting weight barrel” test of the active block ash.
The technicians of the factory took a number of activated block ash with a uniform particle size (20 mm to 40 mm) and placed them in a fixed-capacity “liter weight” bucket. Level with the surface of the “liter weight” bucket, and then weigh it. They used the mass of the ash weighed several times, compared the data of the calcium oxide content of the active ash sampled each time, and obtained the “liter weight” range corresponding to the calcium oxide content of the active ash.
After more than a month of weighing test and quality supervision station test results, the technicians of the factory concluded that the standard barrel weight of activated block ash calcium oxide in the range of 88% to 90% is about 2.7 kg to 2.9 kg. The operator passed Weigh the weight of the active block ash in the standard barrel to determine the calcium oxide content, thereby adjusting the process. This experiment provides data reference and scientific basis for the calcium oxide content of activated block ash, and has high practical value.
In order to consolidate the research results, ensure that the achieved indicators will not decrease, the achieved levels will not retreat, and the achieved results will not be lost, the factory has formulated the “Rotary Kiln Active Block Ash Calcium Oxide Content Operating Instructions” in combination with the preliminary tests and production conditions. 》, will continue to closely follow the actual production situation, continuously revise and improve the work instructions, and further standardize the process operation of the sleeve kiln and shaft kiln.