阅读说明：本技术 一种环保型炼钢活性助熔剂及其制备方法 (Environment-friendly steelmaking active fluxing agent and preparation method thereof ) 是由 董好先 牛登陆 刘志强 于 2019-11-12 设计创作，主要内容包括：本发明公开了一种环保型炼钢活性助熔剂及其制备方法,本发明的冶炼助熔剂包括以下重量百分数的原料组成：氧化铝60-70％,活性剂10-15％,氧化钙8-15％,粘合剂3-5％,其余为水。本发明的环保型炼钢活性助熔剂的原料成本低且能够有效缩短炼钢时间,同时保证了钢材具有较高的品质。(The invention discloses an environment-friendly steelmaking active fluxing agent and a preparation method thereof, wherein the smelting fluxing agent comprises the following raw materials in percentage by weight: 60-70% of aluminum oxide, 10-15% of active agent, 8-15% of calcium oxide, 3-5% of adhesive and the balance of water. The environment-friendly steelmaking active fluxing agent has low raw material cost, can effectively shorten the steelmaking time, and simultaneously ensures that steel has higher quality.)

1. The environment-friendly steelmaking active fluxing agent is characterized by comprising the following raw materials in percentage by weight:

60 to 70 percent of alumina

10 to 15 percent of active agent

8 to 15 percent of calcium oxide

3 to 5 percent of adhesive

The balance of water.

2. The environment-friendly steelmaking active flux as claimed in claim 1, wherein the activator is sodium fluorosilicate.

3. The environment-friendly steelmaking active flux as claimed in claim 1, wherein the binder is prepared by mixing sodium carboxymethylcellulose and water glass in a weight ratio of 1-5: 1.

4. The method for preparing the environment-friendly steelmaking active flux as claimed in any one of claims 1 to 3, characterized by comprising the following steps:

firstly, mixing alumina and an active agent in proportion to prepare a first mixture;

then, mixing the calcium oxide and the adhesive in proportion to prepare a second mixture;

secondly, mixing the mixture I and the mixture II, adding water according to a proportion, and fully stirring for 1-3 h;

and finally, fully drying the uniformly stirred raw materials at the temperature of 50-80 ℃ until the water content in the mixture is lower than 1%, thus obtaining the environment-friendly steelmaking active fluxing agent.

Technical Field

The invention relates to the technical field of steel smelting, in particular to an environment-friendly steelmaking active fluxing agent and a preparation method thereof.

Background

The steel-making process is that pig iron is put into a steel-making furnace to be smelted according to a certain process, and then steel is obtained. The steel products include steel ingots, continuous casting billets, and direct casting into various steel castings. In order to ensure early slag in the steelmaking process and smoothly carry out dephosphorization, desulfurization and blowing operation, a certain amount of fluxing agent needs to be added, and at present, the fluxing agents adopted in the production mainly comprise the following components:

1. with CaF₂Mainly comprises the following components: fluorite is a commonly used slagging and slagging agent, and the main component CaF of fluorite₂However, fluorite is prohibited from being used as a flux because fluorite releases harmful elements during steel making and causes environmental pollution.

2. With Al₂O₃Mainly comprises the following components: vanadic earth (of bauxite, bauxite and bauxite as main raw materials) fluxing agent.

Patent CN99113322.6 discloses a method for preparing Al₂O₃The bauxite fluxing agent mainly comprises the following components: al (Al)₂O₃≥45％，SiO₂≤30％，Fe₂O₃7 to 8 percent of the total weight of the additive, and the balance of CaO, MgO and TiO₂P, S with a particle size of 5-30 mm and a use amount of 1.6-9 kg/ton steel, the effect of the vanadium-soil fluxing agent on slagging is stable, but Al₂O₃Form 3CaO & Al with CaO in lime₂O₃And 12CaO 7Al₂O₃The melting points are 1535 ℃ and 1455 ℃ respectively, and the bauxite fluxing agent can play a role in fluxing slag, but the fluxing effect is not ideal due to the high melting point.

3. FeO is taken as the main component: a ferro-phosphorus fluxing agent (taking iron scale, iron ore and iron scale as main raw materials), and a ferro-phosphorus slagging agent taking FeO as a main component is disclosed in a patent number CN99112573.8, and the ferro-phosphorus fluxing agent comprises the following components: 70-90% of iron scale, 5-25% of ironmaking sludge and 1-5% of binder, the raw materials are crushed, prepared, uniformly mixed and pressed into balls, and the slagging effect of the iron scale fluxing agent is obvious. But mainly composed of FeO and Fe₂O₃The reaction with CaO in lime needs to absorb part of heat, so that the temperature of a molten pool is reduced greatly; with FeO and Fe₂O₃Has the strongest penetrating power and can rapidly destroy 2 CaO. SiO₂The shell has the problems of high slagging speed, short action time, poor continuous slagging effect, serious erosion to a furnace lining and the like.

4. With 4CaO 7Fe₂O₃、CaO·Fe₂O₃A cosolvent which is composed of a small amount of silicon dioxide and is combined as a main component. Patent CN201010110066.8 discloses a flux for steel making, the flux having a composition of 4 CaO.7 Fe, and methods for preparing and using the same₂O₃70％～90％，CaO·Fe₂O₃5％～20％，SiO₂1％～5％，Al₂O₃0-3%, MgO 0-3%, and impurities 0-5%. The fluxing agent can shorten the smelting period by 1-4 min, save energy and improve the productivity under the condition of not increasing the equipment investment.How to further shorten the steelmaking cycle and obtain high-quality steel is a problem which is always concerned by the industry.

Disclosure of Invention

Therefore, the invention aims to provide the environment-friendly steelmaking active fluxing agent. The environment-friendly steelmaking active fluxing agent has low raw material cost, can effectively shorten the steelmaking time, and simultaneously ensures that steel has higher quality.

The invention also aims to provide a preparation method of the environment-friendly steelmaking active fluxing agent.

The environment-friendly steelmaking active fluxing agent comprises the following raw materials in percentage by weight:

60 to 70 percent of alumina

10 to 15 percent of active agent

8 to 15 percent of calcium oxide

3 to 5 percent of adhesive

The balance of water.

Further preferably, the activator is sodium fluosilicate.

Further preferably, the adhesive is prepared by mixing sodium carboxymethylcellulose and water glass in a weight ratio of 1-5: 1.

The preparation method of the steelmaking fluxing agent comprises the following steps:

firstly, mixing alumina and an active agent in proportion to prepare a first mixture;

then, mixing the calcium oxide and the adhesive in proportion to prepare a second mixture;

secondly, mixing the mixture I and the mixture II, adding water according to a proportion, and fully stirring for 1-3 h;

and finally, fully drying the uniformly stirred raw materials at the temperature of 50-80 ℃ until the water content in the mixture is lower than 1%, thus obtaining the environment-friendly steelmaking active fluxing agent.

Compared with the prior art, the invention has the following beneficial effects:

1. the environment-friendly steelmaking active fluxing agent has novel and unique composition, low cost and rapid slagging, accelerates the production rhythm, shortens the smelting time and reduces the power consumption;

2. no harmful gas is generated in the process of storage and use, no smoke or dust is generated, and the temperature is not reduced;

3. the method has the advantages of simple operation, labor intensity reduction, pure molten steel, quality accident disputes reduction and high quality of steel products.

Detailed Description

The present invention will be further described with reference to the following specific examples.