CN-121975993-A - Production method of converter slag melting agent

Abstract

The invention discloses a production method of a converter slag melting agent, which comprises the steps of S1, mixing electrolytic manganese slag and plant fibers, processing the electrolytic manganese slag and plant fibers into particles with the particle size of 10-20 mm by utilizing extrusion granulating equipment, pulling the particles to a steelmaking production line for standby, S2, adding the pellets into a ladle after casting by a continuous casting machine, pouring casting residues of the refining slag into a slag tank after casting by an LF refining machine, S3, repeating the operations until the slag tank is filled with the refining slag, S4, adopting a slow cooling process to cool the slag tank filled with the refining slag to below 100 ℃, crushing and disintegrating the refining slag, processing the refining slag to the particle size of 30-50 mm, and pulling slag blocks with the particle size of 30-50 mm to the converter production line by utilizing a screening system, wherein the adding amount of the slag melting agent is 3-5 kg per ton of steel when the first batch of slag auxiliary materials are added, and the rest smelting processes are unchanged.

Inventors

• LIU WENSHENG
• LIU HONGBO
• YU HAIMING
• WANG QIANG
• LIU RENBO

Assignees

• 新源县渣宝环保技术有限公司

Dates

Publication Date

20260505

Application Date

20260121

Claims (1)

1. 1. The production method of the converter slag melting agent is characterized by comprising the following steps: s1, mixing electrolytic manganese slag and plant fibers, wherein the mass percent of the electrolytic manganese slag and the mass percent of the plant fibers are 95 percent to 5 percent, then processing the mixture into particles with the particle size of 10-20 mm by using extrusion granulation equipment, and pulling the particles to a steelmaking production line for standby; S2, adding the pellets into a ladle after casting of the LF refined molten steel is finished by a continuous casting machine, wherein more than 200-350 kg of pellets are added into each ton of refining slag, and pouring casting residues of the refining slag into a slag tank; S3, repeating the above operation until the slag tank is filled with refining slag; S4, slowly cooling the refining slag to below 100 ℃ by adopting a slow cooling process, crushing and disintegrating the refining slag, processing the refining slag to 30-50 mm granularity, and then pulling slag blocks with granularity of 30-50 mm to a converter production line for standby by a screening system, wherein the total amount of MnO+Al 2 O 3 +SiO 2 in the slag blocks is more than 50%; s5, when the first batch of slag auxiliary materials are added in the converter smelting, adding the slag melting agent, wherein the adding amount is 3-5 kg of ton steel, and the rest smelting processes are unchanged.

Description

Production method of converter slag melting agent Technical Field The invention relates to a production method of a converter slag melting agent. Background There are various types of slag melting agents used in the converter steelmaking process. The most common are fluorite, iron ore, manganese ore, laterite, and the like. The main purpose of using the slag melting agent is to promote the melting of lime and improve smelting conditions. The basic principle is that certain oxides are added into the middle of calcium oxide and can react with the calcium oxide, so that the melting point of the calcium oxide is reduced to realize the purpose of slag melting and fluxing. The melting point reduction range by adding 1% of a certain substance to CaO is shown in the following table: ; The current fluorine-free composite slag melting agent in China mainly comprises four types of borate, caO-Fe 2O3, al 2O3 and MnO. In practical production application, the borate-based (the main component is B 2O5) slag melting agent has the characteristics of limited resources and higher price, the preparation process of the CaO-Fe 2O3 -based needs high-temperature equipment and has a complex process, and the main minerals of the Al 2O3 -based slag melting agent and the MnO-based are common minerals with wide domestic distribution, so that the slag melting agent has the characteristics of sufficient supply and stable price, and the two slag melting agents are also put into industrial experiments and are applied successfully. Six authors in the journal of steelmaking 6 in 2017 published papers entitled "steelmaking process research with flux slag adjustment for converter", referring to documents (1) Shen Jisheng, zhao Weidong, chen Shoujun, zhu Mojun, wang Xiang, in which "flux slag adjustment operation is introduced into converter operation in order to solve the problems that the fluctuation of molten iron composition of blast furnace is large, steady state control and standardization of smelting operation are difficult to achieve in the molten iron smelting process". Application practice shows that after the converter uses the fluxing agent to adjust slag, the slag is not splashed, dried and stuck in the blowing process, the slag consumption is reduced by 9.3kg/t, the metal blowing loss is reduced from 11.60% to 10.01%, the obvious economic effect is obtained, and the purposes of smooth converter smelting and production cost reduction are achieved. The two authors published papers on the journal of metallurgy and materials in the 2 nd period of 2019 entitled "economical steelmaking technology application of 45 ton converter" in which the paper introduces a new way for recycling waste materials of steelworks and aluminum factories, in order to reduce the cost of steelmaking processes, economic materials such as red mud balls, dust balls, returned slag and the like are developed for the converter, and tracking and searching are carried out for the use process of each material, so that the cost of steelmaking processes is reduced, great contribution is made to social environmental protection, and a circular economic production mode is formed. "content expression. It is known from the above literature that the above literature does not mention a process for producing a converter slag melting agent using electrolytic manganese slag and LF refining slag. The electrolytic manganese slag is acid leaching slag generated in the process of producing electrolytic manganese metal by taking manganese ore as a raw material, and is main solid waste in the electrolytic manganese industry. Because manganese ores are often accompanied with Pb, zn, cu, ni, cd and other impurities, a large amount of ammonia water is used in the production process, and therefore, the main pollution sources in the electrolytic manganese slag are manganese and ammonia nitrogen, and the electrolytic manganese slag also contains accompanied heavy metals. The pollutants are easy to migrate to the surrounding ecological environment in the long-term storage process, so that ecological environment risks are caused, and the human health is further endangered. According to statistics, when electrolytic manganese is produced, 1 ton of metal manganese produces 3-12 tons of electrolytic manganese slag. At present, the disposal of electrolytic manganese slag is mainly carried out by open-air stockpiling, and the comprehensive utilization rate is less than 10 percent. The main components of the electrolytic manganese slag generated by a certain factory in south Xinjiang Uygur autonomous region in Xinjiang are shown in the following table: ; Referring to the Shouxian, german army, chen Mengjun and Liu Hui of the document (1), four authors published papers entitled "comprehensive utilization research status and hope of electrolytic manganese slag resources" in the journal of Material guide at 7 th year 2025, and the paper has the key problems of large electrolytic manganese slag yield an