阅读说明：本技术 一种制备铬铁合金的方法 (Method for preparing ferrochrome ) 是由 毕国军 于 2019-09-30 设计创作，主要内容包括：一种制备铬铁合金的方法,涉及铁合金冶炼领域,配料,将合金所属原料铁矿粉、还原剂、助还原剂、形核剂和粘结剂进行混合并得到混合物料；将磨细后的铁矿粉、还原剂、助还原剂、形核剂和粘结剂混合均匀,进行成型处理,获得干燥处理的团块；将上述干燥球团在还原炉内进行还原处理,将混合后的合金粉末装入电炉,将铁棒放入混合后的合金粉末上,然后将铁棒和合金粉末的电炉放入真空高温烧结炉内进行熔炼,获得铬铁合金,本发明一种制备铬铁合金的方法,熔点和密度高,且强度、韧性、延展性和耐磨能力均得到有效的提高,有效降低生产成本,生产过程工艺稳定,电耗低、矿热炉生产周期缩短,原料消耗低,金属回收率高,起到节能效果。(A method for preparing ferrochrome, relate to the ferroalloy and smelt the field, the adjuvants, iron ore powder, reducing agent, help reducing agent, nucleating agent and agglomerant of raw materials that the alloy belongs to mix and get the mixed material; uniformly mixing the finely ground iron ore powder, a reducing agent, a reducing assistant agent, a nucleating agent and a binder, and carrying out forming treatment to obtain a dried briquette; the method for preparing the ferrochrome alloy has the advantages of high melting point and density, effectively improved strength, toughness, ductility and wear resistance, effectively reduced production cost, stable production process, low power consumption, shortened production period of the submerged arc furnace, low raw material consumption, high metal recovery rate and energy saving effect.)

1. A method of preparing ferrochrome, comprising the steps of:

s1: mixing raw materials of iron ore powder, a reducing agent, a reducing assistant agent, a nucleating agent and a binder to obtain a mixed material;

s2: ball milling: grinding the mixed materials;

s3: molding: uniformly mixing the finely ground iron ore powder, a reducing agent, a reducing assistant agent, a nucleating agent and a binder, and carrying out forming treatment to obtain agglomerates;

s4: drying and preheating: drying the briquette to obtain a dried briquette;

s5: reduction treatment: reducing the dried pellets in a reducing furnace to obtain metallized pellets;

s6: smelting in a submerged arc furnace: and (3) putting the mixed alloy powder into an electric furnace, putting an iron rod on the mixed alloy powder, and then putting the electric furnace of the iron rod and the alloy powder into a vacuum high-temperature sintering furnace for smelting to obtain the ferrochrome.

2. A process for the production of ferrochrome alloy according to claim 1 wherein: the binder of the step S1 is composed of bentonite and phenolphthalein solution.

3. A process for the production of ferrochrome alloy according to claim 1 wherein: and step S2, the fineness of the granularity grinding is more than 90% of the granularity grinding with 120 meshes.

4. A process for the production of ferrochrome alloy according to claim 1 wherein: the drying process of step S4 is to use a drying grate for drying and preheating, wherein the drying temperature is 1200-1500 ℃, and the time is 35-45 minutes.

5. A process for the production of ferrochrome alloy according to claim 1 wherein: the smelting temperature of the step S6 submerged arc furnace is 2000-2200 ℃.

Technical Field

The invention relates to a method for preparing ferrochrome, and relates to the field of ferroalloy smelting.

Background

At present, the smelting raw materials of stainless steel mainly comprise blast furnace molten iron, high-carbon ferrochrome, ferronickel and stainless steel scrap. (smelting in a converter or an electric furnace), and the preparation of the high-carbon ferrochrome needs chromium-containing rich ore.

The traditional electric furnace production process of the submerged arc furnace generally comprises the steps of material proportioning, pelletizing and smelting production of ferrochrome alloy by the submerged arc furnace. The pelletizing process adopts a ball pressing or ball shaking method, so that broken balls are easy to generate, the air permeability of materials in the furnace is poor, and the furnace condition is poor; the ore furnace adopts coke blocks as reducing agents, can generate a large amount of emissions of S, CO2 and NO2, and has unstable reducing temperature and low reducing efficiency.

Because the addition of the chromite powder can cause the air permeability of furnace charge to be poor, the production is not smooth and the technical index is deteriorated, so the method can not or rarely use the low-price chromite powder and has higher production cost. In addition, the process has the problems of high energy consumption and heavy pollution.

Disclosure of Invention

The technical problem to be solved by the invention is to provide the method for preparing the ferrochrome alloy, which aims to overcome the defects of the prior art, the melting point and the density are high, the strength, the toughness, the ductility and the wear resistance are effectively improved, the production cost is effectively reduced, the production process is stable, the power consumption is low, the production period of the submerged arc furnace is shortened, the raw material consumption is low, the metal recovery rate is high, and the energy-saving effect is achieved.

A method of preparing a ferrochrome alloy comprising the steps of:

s1: mixing raw materials of iron ore powder, a reducing agent, a reducing assistant agent, a nucleating agent and a binder to obtain a mixed material;

s2: ball milling: grinding the mixed materials;

s3: molding: uniformly mixing the finely ground iron ore powder, a reducing agent, a reducing assistant agent, a nucleating agent and a binder, and carrying out forming treatment to obtain agglomerates;

s4: drying and preheating: drying the briquette to obtain a dried briquette;

s5: reduction treatment: reducing the dried pellets in a reducing furnace to obtain metallized pellets;

s6: smelting in a submerged arc furnace: and (3) putting the mixed alloy powder into an electric furnace, putting an iron rod on the mixed alloy powder, and then putting the electric furnace of the iron rod and the alloy powder into a vacuum high-temperature sintering furnace for smelting to obtain the ferrochrome.

The binder of the step S1 is composed of bentonite and phenolphthalein solution.

And step S2, the fineness of the granularity grinding is more than 90% of the granularity grinding with 120 meshes.

The drying process of step S4 is to use a drying grate for drying and preheating, wherein the drying temperature is 1200-1500 ℃, and the time is 35-45 minutes.

The smelting temperature of the step S6 submerged arc furnace is 2000-2200 ℃.

Has the advantages that: the invention has high melting point and density, effectively improves the strength, toughness, ductility and wear resistance, effectively reduces the production cost, has stable production process and low power consumption, shortens the production period of the submerged arc furnace, consumes low raw materials, has high metal recovery rate and has the effect of saving energy.

Detailed Description

The present invention will be described in further detail by way of examples.