阅读说明：本技术 一种硅铁生产原料组合物 (Raw material composition for ferrosilicon production ) 是由 王宇平 孟庆云 牛燕楠 武恒 李慧军 侯利敏 于 2020-10-23 设计创作，主要内容包括：本发明涉及硅铁生产领域,具体涉及一种硅铁生产原料组合物。本发明使用低成本的低品位铁矿石代替硅铁生产原料中的部分铁制品,使硅铁生产可以从原料选用上节约生产成本,从源头上解决硅铁生产成本升高的问题。同时,使用低品位铁矿石代替部分铁制品进行硅铁冶炼,省去矿石的中间深加工环节,减少能源消耗,节能环保。(The invention relates to the field of ferrosilicon production, and particularly relates to a raw material composition for ferrosilicon production. The invention uses low-cost low-grade iron ore to replace part of iron products in raw materials for producing the ferrosilicon, so that the production cost of the ferrosilicon can be saved from the raw material selection, and the problem of the increase of the production cost of the ferrosilicon is solved from the source. Meanwhile, the ferrosilicon smelting is carried out by using the low-grade iron ore to replace part of ironwork, so that the intermediate deep processing link of the ore is saved, the energy consumption is reduced, and the energy-saving and environment-friendly effects are achieved.)

1. The ferrosilicon production raw material composition comprises the following components in parts by weight:

185 portions of semi coke and 190 portions,

280 portions of silica and 320 portions of,

55-65 parts of ironwork and low-grade iron ore.

2. The composition according to claim 1, wherein the low-grade iron ore accounts for 30-60% of the total amount of the iron product and the low-grade iron ore.

3. The composition according to claim 2, wherein the low-grade iron ore accounts for 30-45% of the total amount of the iron product and the low-grade iron ore.

4. The composition according to claim 3, wherein the low-grade iron ore accounts for 33-36% of the total amount of the iron product and the low-grade iron ore.

5. The composition as claimed in claim 1, wherein the ferrous object is composed of at least one of oxide scale, sintered ore, and pellet ore.

6. The composition as claimed in claim 5, wherein the iron article is a pellet.

7. The composition according to claim 1, wherein the low-grade iron ore is brown magnetite.

8. The composition according to claim 1, wherein the iron in the low-grade iron ore is present in the form of Fe₃O₄The iron content is more than or equal to 55 percent, the aluminum oxide content is lower than 1 percent, and the calcium oxide content is lower than 1 percent.

9. The composition of claim 1, wherein the semi-coke has a carbon content of greater than 85%; said silica content is greater than 95%; the iron element content of the pellets is more than 60 percent.

10. A method for ferrosilicon refining using the composition according to any one of claims 1 to 9, comprising the steps of:

1) weighing the raw materials in parts by weight;

2) the weighed raw materials are sequentially added into a smelting furnace according to the sequence of semi coke, iron products, silica and iron ore;

3) ferrosilicon smelting is carried out;

4) and directly casting the molten iron after smelting.

Technical Field

The invention relates to the field of ferrosilicon production, and particularly relates to a raw material composition for ferrosilicon production.

Background

Ferrosilicon is an iron alloy of iron and silicon. Since silicon and oxygen are easily synthesized into silica, ferrosilicon is often used as a deoxidizer, while SiO is used₂The heat is released in a large amount during the production, and it is advantageous to raise the temperature of molten steel while deoxidizing. SiliconIron can also be used as an alloy element additive, and is applied to low-alloy structural steel, spring steel, bearing steel, heat-resistant steel and electrical silicon steel, and ferrosilicon is also frequently used as a reducing agent in ferroalloy production and chemical industry.

The production of ferrosilicon uses natural silica as raw material, uses reducing carbon as reducing agent and adds a certain quantity of iron-containing raw material to smelt in ore-smelting electric furnace, when the ferrosilicon is produced by adopting said process, in order to ensure permeability of ore-smelting furnace charge surface, the grain size of silica and coke grain is relatively large, the grain size of silica is generally 60-120mm, the grain size of coke grain is generally 5-22mm, the reaction starting theoretical reduction temperature of silicon dioxide reduced by carbon under the condition of existence of iron is 1623 deg.C, and the actual ferrosilicon smelting temperature is above 1700 deg.C.

The iron-containing raw material is one or a mixture of several of oxide skin, sintered ore, pellet ore and the like, and the inventor finds that the iron-containing raw material is greatly influenced by external factors, so that the raw material supply of iron products is unstable, the price of the iron products is increased continuously, and the production cost of ferrosilicon is increased gradually.

Chinese patent CN105886765A discloses a method for preparing ferrosilicon, which uses copper slag to replace steel scrap and partially replace silica to smelt ferrosilicon, thus not only reducing the production cost of ferrosilicon, but also avoiding the pollution of copper slag to the environment. The raw materials of the coal comprise copper slag, silica and medium-low rank coal according to the mass ratio of 100: (120-140): (70-100) is used as a raw material to carry out ferrosilicon smelting, and the produced ferrosilicon meets the standard of the trade mark FeSi75Al2.0-C, FeSi75Al1.0-B or FeSi75Al1.0-A.

Chinese patent CN106086411A discloses a method and system for preparing ferrosilicon from red mud, the method comprising: (1) mixing and dissolving out the red mud and alkali liquor so as to obtain a solid-liquid mixture; (2) separating the solid-liquid mixture to respectively obtain a high-alkalinity solution and dealuminized red mud; (3) and smelting the dealuminized red mud, a carbonaceous reducing agent and silica so as to obtain the ferrosilicon. The smelted ferrosilicon meets the standard of the brand FeSi75Al11.0-A or FeSi75Al11.0-B.

The search for a new method for producing the low-cost ferrosilicon has important significance for ferrosilicon production enterprises.

Disclosure of Invention

The invention aims to provide a raw material composition for producing ferrosilicon, so that the production cost of ferrosilicon production can be saved from raw material selection, and the problem of increase of the production cost of ferrosilicon is solved from the source.

The object of the present invention is achieved by the following means.

The invention provides a ferrosilicon production raw material composition, which comprises the following components in parts by weight:

185 portions of semi coke and 190 portions,

280 portions of silica and 320 portions of,

The total amount of the ironwork and the iron ore is 55 to 65 parts.

Further, the total amount of the ironwork and the iron ore is 55-60 parts.

Further, the low-grade iron ore accounts for 30-60% of the total amount of the iron products and the low-grade iron ore.

Further, the low-grade iron ore accounts for 30-45% of the total amount of the iron products and the low-grade iron ore.

Further, the low-grade iron ore accounts for 33-36% of the total amount of the iron products and the low-grade iron ore.

Further, the iron product is selected from at least one of oxide scale, sintered ore, and pellet ore.

Further, the iron product is a pellet.

Further, the low-grade iron ore is brown magnetite.

Further, the iron in the low-grade iron ore exists in the form of Fe₃O₄The iron content is greater than or equal to 55 percent.

Further, the content of aluminum oxide in the low-grade iron ore is lower than 1%, and the content of calcium oxide in the low-grade iron ore is lower than 1%.

In another aspect of the present invention, there is provided a method for refining ferrosilicon using the above raw material composition, the method comprising the steps of:

1) weighing the raw materials in parts by weight;

2) the weighed raw materials are sequentially added into a smelting furnace according to the sequence of semi coke, iron products, silica and iron ore;

3) ferrosilicon smelting is carried out;

4) and directly casting the molten iron after smelting.

The compositions are proportioned according to parts by weight, can be increased or reduced according to corresponding proportions during production, and the units can be g, kg, t and other weight units known by the technical personnel in the field, and the weight can be increased or reduced, but the proportion of the weight proportions among the compositions is not changed.

The main advantages of the invention are:

1) the invention directly uses the low-grade iron ore to replace part of ironwork to smelt the ferrosilicon, saves the intermediate deep processing link of the ore, reduces the energy consumption, saves energy and protects the environment.

2) The low-grade iron ore used by the invention has lower cost than iron products, thereby reducing the production cost.

3) The invention adopts the iron ore with proper proportion to replace part of high-cost iron products, obtains the ferrosilicon product which meets the national standard on the basis of reducing the production cost, and has the significance of industrial popularization.

Detailed Description

The materials used in the invention are all commercially available materials, wherein the semi coke is Shaanxi cymbidium semi coke, and the carbon content is more than 85%; the production place of silica is inner Mongolia, and the content of silicon element is more than 95 percent; the pellet production area is Ningxia, and the content of iron element is more than 60 percent; the low-grade iron ore is produced in inner Mongolia region, wherein the iron exists in the form of Fe₃O₄The iron content is more than or equal to 55 percent, the aluminum oxide content is lower than 1 percent, and the calcium oxide content is lower than 1 percent.

Example 1

Method for refining ferrosilicon

1) 190kg of semi-coke 185-plus, 300kg of silica, 40kg of pellet ore and 18kg of low-grade iron ore are weighed.

Wherein the iron in the low-grade iron ore exists in the form of Fe₃O₄The iron content is more than or equal to 55 percent, and the content of aluminum oxide is less than 1 percent,The content of calcium oxide is less than 1%.

2) The weighed raw materials are sequentially added into a smelting furnace according to the sequence of semi coke, iron products, silica and iron ore;

3) and carrying out ferrosilicon smelting.

4) And directly casting the molten iron after smelting.

Example 2

Method for refining ferrosilicon

1) 190kg of semi-coke 185-plus, 300kg of silica, 23kg of pellet ore and 35kg of low-grade iron ore are weighed.

Wherein the iron in the low-grade iron ore exists in the form of Fe₃O₄The iron content is more than or equal to 55 percent, the aluminum oxide content is lower than 1 percent, and the calcium oxide content is lower than 1 percent.

2) The weighed raw materials are sequentially added into a smelting furnace according to the sequence of semi coke, iron products, silica and iron ore;

3) and carrying out ferrosilicon smelting.

4) And directly casting the molten iron after smelting.

Example 3

Method for refining ferrosilicon

1) 190kg of semi-coke 185-plus, 300kg of silica, 38kg of pellet and 20kg of low-grade iron ore are weighed.

2) The weighed raw materials are sequentially added into a smelting furnace according to the sequence of semi coke, iron products, silica and iron ore;

3) and carrying out ferrosilicon smelting.

4) And directly casting the molten iron after smelting.

Example 4

Method for refining ferrosilicon

1) 190kg of semi-coke 185-plus, 300kg of silica, 32kg of pellet ore and 26kg of low-grade iron ore are weighed.

2) The weighed raw materials are sequentially added into a smelting furnace according to the sequence of semi coke, iron products, silica and iron ore;

3) and carrying out ferrosilicon smelting.

4) And directly casting the molten iron after smelting.

The ferrosilicon produced by the refining method of the embodiment 1-4 meets the product quality requirement of FeSi75A12.0-C in the national standard of the people's republic of China, namely, ferrosilicon GB2272-87, and the quality requirement of the FeSi75A12.0-C product is shown in Table 1.

Table 1 FeSi75A12.0-C brand FeSi75A12.0-C each element content requirement (unit:%)

Si

Al

Mn

Cr

P

S

C

72-80

≤2.0

≤0.5

≤0.5

≤0.04

≤0.02

≤0.2

Comparative example 1

1) 190kg of semi-coke 185-flyash, 300kg of silica and 58kg of pellet ore are weighed

2) The weighed raw materials are sequentially added into a smelting furnace according to the sequence of semi coke, iron products, silica and iron ore;

3) and carrying out ferrosilicon smelting.

4) And directly casting the molten iron after smelting.

The product meets the quality requirements of FeSi75A12.0-C products.

Taking the method provided in embodiment 3 of the present invention as an example, the total unit consumption of the iron product composed of the low-grade iron ore and the pellet ore is 0.375 ton/ton, the unit price of the iron product is 581.47 yuan/ton, and the cost of the iron product is 218.05 yuan/ton; in the comparative example 1, the unit consumption of the pellet used as the iron product is 0.345 ton/ton, the unit price of the pellet is 1000 yuan/ton, and the cost of the iron product is 345 yuan/ton; thus, in example 3, the cost can be reduced by 345 yuan/ton to 218.05 yuan/ton to 126.95 yuan/ton, as compared with comparative example 1. According to the annual capacity of 6 tons/hour, the annual capacity is 24X 6X 365 to 52560 tons, and 52560 tons, 126.95 yuan/ton to 667.2492 ten thousand yuan can be saved.

Therefore, the ferrosilicon production raw material composition provided by the invention can reduce the production cost and has good economic benefit and industrial value.

Comparative example 2-excessive use of Low-grade iron Ore

Method for refining ferrosilicon

1) 190kg of semi-coke 185-plus, 300kg of silica, 13kg of pellet ore and 45kg of low-grade iron ore are weighed.

Wherein the iron in the low-grade iron ore exists in the form of Fe₃O₄The iron content is more than or equal to 55 percent, the aluminum oxide content is lower than 1 percent, and the calcium oxide content is lower than 1 percent.

2) The weighed raw materials are sequentially added into a smelting furnace according to the sequence of semi coke, iron products, silica and iron ore;

3) and carrying out ferrosilicon smelting.

4) And directly casting the molten iron after smelting.

The product can not meet the quality requirement of FeSi75A12.0-C products.

The content of impurities in the product cannot meet the quality requirement of FeSi75A12.0-C products due to the excessive use amount of the low-grade iron ores, so that the use amount of the low-grade iron ores cannot be excessively increased in pursuit of lower production cost.

The invention comprehensively considers the balance between the production cost and the product quality, obtains the ferrosilicon product which meets the national standard on the basis of reducing the production cost, and has the significance of industrial popularization.

Finally, it should be noted that the above-mentioned contents are only used for illustrating the technical solutions of the present invention, and not for limiting the protection scope of the present invention, and that the simple modifications or equivalent substitutions of the technical solutions of the present invention by those of ordinary skill in the art can be made without departing from the spirit and scope of the technical solutions of the present invention.