CN107488784A - A kind of blast furnace ironmaking superfluxed pellets and its production method - Google Patents

Abstract

The invention discloses a high-alkalinity pellet for blast furnace ironmaking and a production method thereof, belonging to the technical field of iron and steel metallurgy. A high-alkalinity pellet for blast furnace ironmaking according to the present invention, the pellet is made of concentrate powder, refining slag and bentonite as raw materials, and the mass percentages of each component are respectively: concentrate powder 60 ‑76%, refining slag 22‑38%, bentonite 1.5‑2.5%; the production method of high alkalinity pellets of the present invention, the steps are: raw material addition, green pellet formation, green pellet preheating, green pellet roasting , Pellet cooling. The invention uses fine ore powder and refining slag as raw materials to produce qualified pellets with an alkalinity of over 2.0, which can completely replace high-basicity sintered ore as the main raw material for furnace feeding, and realizes the internal consumption of waste slag, which solves the problem of waste It reduces the cost of pellet production and waste slag treatment while reducing energy consumption and pollution emissions, and the produced pellets have high compressive strength, low S content, and excellent metallurgical properties.

Description

High-alkalinity pellets for blast furnace ironmaking and production method thereof

technical field

The invention belongs to the technical field of iron and steel metallurgy, and more specifically relates to a method for producing high-alkalinity pellets by utilizing fine ore powder and refining slag.

Background technique

In steel production, the BF-BOF process has always occupied a dominant position, while blast furnace ironmaking is the main source of molten iron, accounting for more than 90% of the total pig iron production. The raw materials for blast furnace ironmaking mainly include iron ore, fuel, flux, and blast. Iron-containing raw materials. The control of the basicity of sinter and pellets is also beneficial to blast furnace slagging, ensuring the basicity and fluidity of slag, which is beneficial to blast furnace desulfurization and iron tapping. However, in the entire BF-BOF process of steel production, the energy consumption of the sintering process accounts for 7.4%, and the pelletizing process accounts for 1.2%. The environmental pollution caused by the sintering process is far more than that of the pelletizing process. With the intensification of competition in the steel industry and the increasing pressure on environmental protection, cost reduction, efficiency enhancement, and environmentally friendly production methods have attracted more and more attention from the industry. Therefore, the production of high-alkalinity pellets to replace sinters with high energy consumption and high pollution will become a new direction for the production and development of iron-containing raw materials in the future.

The development and development of high-alkalinity pellet production technology is helpful for energy saving, emission reduction, cost reduction and efficiency increase. At present, most of the pellets produced in China are acid pellets, and the production of flux-type pellets has never been on an industrial scale. Only a small number of enterprises produce low-alkalinity flux-type pellets. Flux-type pellets are directly added CaO, MgO and other fluxes to iron-containing materials during the pelletizing process to make them contain a certain alkalinity, thereby improving the metallurgical properties of the pellets. After long-term practice and exploration of blast furnace smelting, the basicity of the pellets produced in China is CaO/SiO ₂ =0.9-1.2, MgO=2.7-3.5%, which has high reduction degree, low expansion rate, high reflow temperature and narrow reflow temperature range. And other good metallurgical properties. However, due to the lack of sources of MgO flux, high raw material cost, poor desulfurization ability, and a certain amount of CaO needs to be added in blast furnace production to adjust slag alkalinity and fluidity, general enterprises do not use magnesium-containing raw materials as pellets to produce added flux. Calcium-containing raw materials (mainly CaO and CaCO ₃ ) have a wide range of sources and low production costs, but CaO will absorb a lot of water and tend to expand during drying, preheating or roasting, causing the pellets to crack. Therefore, in the prior art, only CaO to produce low-alkalinity pellets with an alkalinity between 0.9-1.2. When CaCO ₃ is used as a flux, the melting loss reaction of C will occur in the blast furnace, which will accelerate the consumption of coke in the furnace. Therefore, CaCO ₃ is generally not used as a flux for pellet production in the industry. Therefore, it is the goal pursued by iron smelters to explore new fluxes and realize the production of high-basicity pellets.

Through patent retrieval, relevant pellet production methods have been disclosed at present. For example, Chinese Patent Application No. CN201110275404.8 discloses a method for producing oxidized pellets using gold ore tailings and limonite. The ore powder is mixed according to the proportion of 40%, 30% and 30% by weight respectively, and made into green pellets, and then preheated in the chain grate machine, and the bursting temperature of the pellets is increased by prolonging the preheating time of the green balls to improve The metallurgical properties of the pellets are improved, and then enter the rotary kiln to be fired and shaped, and finally cooled by the ring cooler to make oxidized pellets. This method uses gold ore tailings as one of the raw materials for waste utilization, and slightly improves the bursting performance of green pellets through temperature control, but the product produced is still acidic pellets, and the alkalinity of pellets is not fundamentally improved. Production of self-fluxing pellets with high alkalinity, limited application range. Patent application number CN201410007020.1 discloses a titanium-rich pellet and its production method. The application provides a production method for titanium-rich pellets. During the production process, titanium-containing raw materials are added to the raw materials. The content of TiO ₂ in the green pellets is 10-15%, TFe is 40-55%, the titanium-rich pellets prepared in this application are also acidic pellets, only improved in metallurgical properties, and cannot essentially replace high-energy-consumption and high-pollution high-alkalinity sintering Ore is used as the main raw material for the blast furnace.

As another example, Chinese patent 201610027266.4 discloses a method of using steel slag to prepare alkaline pellets and the products obtained by the method. In this application, the mass ratio of steel slag powder to iron concentrate powder (12-30): (70 -88) Mix evenly to obtain a mixture, and then sequentially perform pelletizing, drying, preheating, roasting and ring cooling on the mixture to obtain alkaline pellets. This application uses steel slag (ie, converter slag) as an additive. Due to the low alkalinity of steel slag, it is generally only between 1.0-3.0, and the content of impurities such as S and P contained therein is high. If it needs to be added in a large amount, it needs to consume a lot of heat, but the metallurgical coke resources of the blast furnace are scarce and the price is high. After adding a large amount of steel slag into the pellets, the fuel will be consumed and the production cost will increase. In addition, blast furnace production has high requirements on S, P, and alkali metals. The addition of a large amount of steel slag causes too many impurity elements in the furnace, which affects the quality of pig iron. Therefore, from the aspects of production cost and product quality, it is not suitable to use steel slag as an additive.

The patent application No. 201510447174.7 discloses an anti-adhesive alkaline pellet and its manufacturing method. The chemical composition of the anti-adhesive alkaline pellet is: TFe: 59-66 parts; MgO: 0.8-2.0 parts; SiO ₂ : 0.5-3.5 parts; CaO/SiO ₂ : 0.6-1.8. In this application, a binding agent, a calcium-containing additive and a magnesium-containing additive are added to the iron concentrate, and the finished anti-caking alkaline pellets are obtained through surface treatment, pelletizing and sintering. However, due to the addition of 0.8-2.0% MgO in the alkaline pellets, the production cost of iron and steel enterprises with a large amount of raw materials for the pellets has been greatly increased, and the calcium-containing additive is a mixture of quicklime or quicklime and limestone, which does not solve the problem of quicklime (main component) After CaO) absorbs water, it expands and cracks during the roasting process, and the added limestone (the main component is CaCO ₃ ) will also accelerate the melting loss of coke in the blast furnace.

The application with application number 2006100012540 discloses a production method of flux-type iron ore powder composite pellets. The amount of CaO and MgO in the secondary pelletizing process can effectively control the binary alkalinity of the pellets to be between 0.5-2.0. This application adopts the production method of secondary pelletizing to produce qualified pellets with higher alkalinity, which increases the capital construction cost and management cost of the enterprise's production, and adds a certain amount of MgO as raw material, which increases the production cost of blast furnace molten iron . At the same time, the limestone and dolomite added during the secondary pelletizing enter the blast furnace and decompose, react with the coke in the furnace, accelerate the melting loss of the coke, and destroy the coke's material column skeleton, which is not conducive to the air permeability of the blast furnace and the stability of the furnace condition .

To sum up, the existing pellet production processes all use iron-containing materials as raw materials, and then go through green pellet drying, preheating, roasting and cooling to produce pellets, or add a small amount of additives to improve the metallurgical properties of pellets, and produce pellets. Most of the products produced are acid pellets or low-alkalinity pellets, which cannot fundamentally change the charge structure of high-basic sinter with acid pellets and lump ore, so that the iron existing in the blast furnace ironmaking process will be affected. The problems of energy consumption and environmental pollution of the former system cannot be effectively solved.

Contents of the invention

1. The technical problem to be solved by the invention

The purpose of the present invention is to overcome the deficiency that the existing pellet production process cannot produce high-alkalinity pellets that meet the requirements, which leads to serious problems of energy consumption and environmental pollution in the blast furnace ironmaking process, and provides a Disclosed are high-basicity pellets for blast furnace ironmaking and a production method thereof. The technical scheme of the invention can produce high-alkalinity pellets, thereby solving the shortcomings of the existing pellet production process, and the composition and quality of the obtained pellets fully meet the requirements of blast furnace ironmaking.

2. Technical solution

In order to achieve the above object, the technical scheme provided by the invention is:

A high-alkalinity pellet for blast furnace ironmaking according to the present invention, the pellet is made of concentrate powder, refining slag and bentonite as raw materials, and the mass percentages of each component are respectively: concentrate powder 60 -76%, refining slag 22-38%, bentonite 1.5-2.5%.

Furthermore, the pellets have an alkalinity of 1.9-2.6 and a compressive strength of 3100-5000N.

Furthermore, the mass fraction of TFe in the concentrate powder is 65-70%, the mass fractions of CaO and SiO are 1-1.5%, _3-3.3 % respectively; the refining slag contains 45-50% of CaO , containing 8-15% of SiO ₂ ; the bentonite contains 2-3% of CaO and 68-70% of SiO ₂ .

The production method of the high-alkalinity pellets for blast furnace ironmaking of the present invention, the high-alkalinity pellets are obtained by pelletizing, preheating and roasting with ore concentrate powder, refining slag and bentonite as raw materials, Specifically include the following steps:

Step 1. Adding raw materials

Grinding raw pelletizing raw materials concentrate powder, refining slag and bentonite into powder, drying, and then mixing according to the ratio of raw materials to obtain a mixture;

Step two, ball making

Pelletizing the obtained mixture to obtain raw pellets, and screening qualified pellets with a particle size of 10-16mm;

Step 3. Preheating the raw balls

The prepared green pellets are first dried at a temperature of 100-200°C for 7-10 minutes, and then preheated at a temperature of 500-1000°C for 12-20 minutes;

Step 4. Green ball roasting

Continue to heat up the preheated pellets and roast them at 900-1300°C for 25-40 minutes, then take them out after cooling in the furnace to obtain qualified high-alkalinity pellets.

Furthermore, in the step 1, the drying temperature of the powder is 90-110° C., and the drying time is 2 hours.

Furthermore, in the second step, a disc pelletizer is used for pelletizing treatment, the rotating speed of the disc pelletizer is 6-8 rad/min, and the disc inclination angle is 45-48°.

Furthermore, the drop strength of the pellets obtained in the second step is 3-5 times, and the compressive strength is 7-11N.

Furthermore, the drying, preheating and roasting of the pellets are all carried out in an electric furnace, and the whole process is completed by setting the temperature in a programmed manner.

3. Beneficial effect

Compared with the prior art, the technical solution provided by the invention has the following remarkable effects:

(1) A kind of high-basicity pellets for blast furnace ironmaking of the present invention is made of fine ore powder, refining slag and bentonite as raw materials. The present invention uses refining slag rich in flux CaO as one of the raw materials. 1. It can produce high-alkalinity pellets, which can replace high-energy-consumption and high-pollution high-alkalinity sintered ore as the main charge of the blast furnace, thereby effectively improving the energy consumption and Environmental Pollution.

(2) A kind of production method of high alkalinity pellets for blast furnace ironmaking of the present invention, this method is raw material with fine ore powder, refining slag and bentonite, can produce high alkalinity through pelletizing, preheating and roasting treatment High-strength pellets, by optimizing the raw material composition and proportion of the pellets, the resulting pellets have an alkalinity as high as 2.0 or more, breaking the existing pellet production technology where the alkalinity of qualified pellets does not exceed 1.0 Recognition, so that high-basicity pellets can completely replace high-basicity sinter, together with acid pellets, to achieve 100% pellets into the furnace, compared with the existing blast furnace charge structure, greatly reducing energy consumption and pollution emissions , saving production costs while reducing pollution and effectively protecting the environment.

(3) A kind of production method of high-basicity pellets for blast furnace ironmaking of the present invention, by selecting refining slag as one of raw materials, and the basicity of this refining slag is high, S impurity content is low, and raw ore S content is basically Balanced, thereby reducing the desulfurization burden of the blast furnace, ensuring a low S content in molten iron, and supplemented by the optimization of production process parameters, it can effectively solve the problem that the existing high-alkalinity pellets are easy to crack during preheating and roasting , the produced pellets have high compressive strength, low S content and excellent metallurgical properties, which can effectively meet the technological requirements of blast furnace ironmaking.

(4) A kind of production method of high-basicity pellets for blast furnace ironmaking of the present invention adopts fine ore powder and refining slag as raw materials, fully utilizes the waste refining slag produced in the refining process, thereby saving pellet production raw materials, greatly reducing the production cost of pellets, which is of great significance for enterprises to reduce costs and increase efficiency; at the same time, using refining slag as an additive for waste utilization also realizes the internal consumption of waste residues, solves the problems of waste stacking and pollution, and saves waste residues Occupying land and processing costs, and protecting the environment, so this method is suitable for popularization and application.

Description of drawings

Fig. 1 is a schematic process flow diagram of a production method of high-basicity pellets for blast furnace ironmaking of the present invention.

detailed description

Aiming at the problems of high energy consumption and high pollution in the existing "high alkalinity sinter + acid pellet" blast furnace charge structure, research on the production of alkaline pellets has become a research hotspot for metallurgists in recent years. Most of the existing technologies increase the alkalinity of the pellets by adding CaO or MgO, but MgO has relatively few sources, high raw material costs, and poor desulfurization ability; while CaO is used as the alkaline In the case of additives, when the addition amount is large, the strength of the obtained pellets will obviously decrease, and the pellets are very easy to crack during the production process, so they have not been popularized and applied. Therefore, the alkalinity of the alkaline pellets produced by the existing process is relatively low, and cannot be used to replace sintered ore with high energy consumption and high pollution. In addition, the compressive strength of the existing alkaline pellets is relatively low, and they are prone to cracking and pulverization in the blast furnace ironmaking process. With the increase of the alkalinity of the pellets, this problem becomes more serious.

The present invention uses fine ore powder and refining slag as raw materials, undergoes processes such as compounding and pelletizing, drying and preheating, roasting and cooling, and optimizes the composition, mixing ratio and specific production process parameters of each raw material, so that it can produce High alkalinity pellets, the alkalinity of the obtained pellets is even as high as 2.0 or more, the high alkalinity pellets can replace high energy consumption and high pollution high alkalinity sintered ore as the main charge of the blast furnace, greatly reducing energy consumption and Pollution discharge saves production cost and protects the environment at the same time, and the composition and quality of the obtained pellets fully meet the requirements. At the same time, the adoption of the technical solution of the present invention also significantly improves the compressive strength of the obtained pellets, and the obtained pellets have a low S content, which can effectively avoid pulverization and cracking during the blast furnace ironmaking process, thereby ensuring that the obtained molten iron is smelting performance. In addition, the present invention can effectively control the basicity of the pellets by controlling the mass fractions of the added concentrate powder and refining slag, and the adjustment of the basicity of the pellets is simple.

In order to further understand the content of the present invention, the present invention will be described in detail in conjunction with specific embodiments.

Example 1

A kind of production method of high-basicity pellets for blast furnace ironmaking of the present embodiment, its technological process diagram is as shown in Figure 1, and its concrete steps are:

Step 1. Adding raw materials

Grind raw pelletizing raw material concentrate powder, refining slag and bentonite to make powder. The self-fluxing pellets in this embodiment are composed of the following components in mass percentage: concentrate powder 71.8%, refining slag 26.2% %, binder bentonite 2%, wherein the composition of concentrate powder, refining slag and bentonite in this embodiment is shown in Table 1-Table 3. The mixture was placed in an oven, dried at 110° C. for 2 hours, and then mixed until fully mixed to obtain the mixture.

Table 1 Concentrate powder composition list (%)

Table 2 Composition of refining slag (%)

Table 3 Bentonite composition list (%)

Step 2. Green ball formation

Pellet the well-mixed mixture on a disc pelletizer with a rotating speed of 7rad/min and a disc inclination of 45° to make green pellets, and screen out the pellets with a particle size of 10-16mm. Qualified pellets, the average drop strength of the obtained pellets is 3.2 times, and the compressive strength is 8.21N.

Step 3. Preheating the raw balls

The prepared green pellets were placed in an electric furnace and dried at a temperature of 200°C for 8 minutes, and then the pellets were preheated at a temperature of 1000°C for 12 minutes.

Step 4. Green ball roasting

Continue to heat up the preheated pellets in an electric furnace, and roast them at a temperature of 1200° C. for 35 minutes.

Step 5. Pellet Cooling

The roasted pellets are taken out after being cooled in the furnace. The roasted pellets are high-basicity pellets with a basicity of 2.1 and a compressive strength of 4470N, and qualified high-basicity pellets are obtained.

Example 2

A kind of method of utilizing fine ore powder and refining slag to produce high alkalinity pellets of the present embodiment, its specific steps are:

Step 1. Adding raw materials

Grind raw pelletizing raw material concentrate powder, refining slag and bentonite to make powder. The self-fluxing pellets in this embodiment are composed of the following components in mass percentage: concentrate powder 60.5%, refining slag 37.5% %, binder bentonite 2%, the composition of concentrate powder, refining slag and bentonite is the same as embodiment 1 in the present embodiment. The mixture was placed in an oven, dried at 110° C. for 2 hours, and then mixed until fully mixed to obtain the mixture.

Step 2. Green ball formation

Pellet the well-mixed mixture on a disc pelletizer with a rotating speed of 7rad/min and a disc inclination of 45° to make green pellets, and screen out the pellets with a particle size of 10-16mm. Qualified pellets, the average drop strength of the obtained pellets is 3.4 times, and the compressive strength is 10.01N.

Step 3. Preheating the raw balls

The prepared green pellets were placed in an electric furnace and dried at a temperature of 100°C for 8 minutes, and then preheated at a temperature of 900°C for 15 minutes.

Step 4. Green ball roasting

Continue to heat up the preheated pellets in an electric furnace, and roast them at a temperature of 1300° C. for 25 minutes.

Step 5. Pellet Cooling

The roasted pellets are taken out after being cooled in the furnace. The roasted pellets are high-basicity pellets with a basicity of 2.6 and a compressive strength of 3160N, and qualified high-basicity pellets are obtained.

Example 3

A kind of method of utilizing fine ore powder and refining slag to produce high alkalinity pellets of the present embodiment, its specific steps are:

Step 1. Adding raw materials

Grind raw pelletizing raw material concentrate powder, refining slag and bentonite to make powder. The self-fluxing pellets in this embodiment are composed of the following components in mass percentage: concentrate powder 76%, refining slag 22% %, binder 2%, wherein the composition of concentrate powder, refining slag and bentonite is shown in Table 4-Table 6 below. The mixture was placed in an oven, dried at 90° C. for 2 hours, and then mixed until fully mixed to obtain the mixture.

Table 4 Concentrate powder composition table (%)

Table 5 Composition of refining slag (%)

Table 6 Bentonite composition table (%)

Step 2. Green ball formation

The well-mixed mixture is pelletized on a disc pelletizer, the disc pelletizer rotates at 6rad/min, and the disc inclination is 48° to make green pellets, and the particles with a particle size of 10-16mm are screened out. Qualified pellets, the average drop strength of the obtained pellets is 5 times, and the compressive strength is 11N.

Step 3. Preheating the raw balls

The prepared green pellets were placed in an electric furnace and dried at a temperature of 175°C for 7 minutes, and then preheated at a temperature of 500°C for 20 minutes.

Step 4. Green ball roasting

Continue to heat up the preheated pellets in an electric furnace, and roast them at a temperature of 900° C. for 40 minutes.

Step 5. Pellet Cooling

The roasted pellets are taken out after being cooled in the furnace. The roasted pellets are high-basicity pellets with a basicity of 1.9 and a compressive strength of 3400N, and qualified high-basicity pellets are obtained.

Example 4

A kind of method of utilizing fine ore powder and refining slag to produce high alkalinity pellets of the present embodiment, its specific steps are:

Step 1. Adding raw materials

Grind raw pelletizing raw material concentrate powder, refining slag and bentonite to make powder. The self-fluxing pellets in this embodiment are composed of the following components in mass percentage: concentrate powder 65%, refining slag 32.5% %, binder 2.5%, wherein the composition of concentrate powder, refining slag and bentonite is shown in Table 7-9 below. The mixture was placed in an oven, dried at 103° C. for 2 hours, and then mixed until fully mixed to obtain a mixture.

Table 7 Concentrate powder composition table (%)

Table 8 Composition of refining slag (%)

Table 9 Bentonite composition table (%)

Step 2. Green ball formation

Pellet the well-mixed mixture on a disc pelletizer with a rotating speed of 8 rad/min and a disc inclination of 46° to make green pellets, and screen out particles with a particle size of 10-16mm. Qualified pellets, the average drop strength of the obtained pellets is 3 times, and the compressive strength is 7N.

Step 3. Preheating the raw balls

The prepared green pellets were placed in an electric furnace and dried at a temperature of 120°C for 10 minutes, and then preheated at a temperature of 750°C for 17 minutes.

Step 4. Green ball roasting

Continue to heat up the preheated pellets in an electric furnace, and roast them at a temperature of 1050° C. for 30 minutes.

Step 5. Pellet Cooling

The roasted pellets are taken out after being cooled in the furnace, and the roasted pellets are high-basicity pellets with a basicity of 2.4 and a compressive strength of 5000N, and qualified high-basicity pellets are obtained.

Example 5

A kind of method of utilizing fine ore powder and refining slag to produce high alkalinity pellets of the present embodiment, its specific steps are:

Step 1. Adding raw materials

Grind raw pelletizing raw material concentrate powder, refining slag and bentonite to make powder. The self-fluxing pellets in this embodiment are composed of the following components in mass percentage: concentrate powder 63%, refining slag 35.5% %, binder 1.5%, wherein the embodiment 4 of concentrate powder, the composition of refining slag and bentonite is shown in Table 10-Table 11 below. The mixture was placed in an oven, dried at 98° C. for 2 hours, and then mixed until fully mixed to obtain the mixture.

Table 10 Composition of refining slag (%)

Table 11 Bentonite composition table (%)

Step 2. Green ball formation

Pellet the well-mixed mixture on a disc pelletizer with a rotating speed of 8 rad/min and a disc inclination of 47° to make green pellets, and screen out particles with a particle size of 10-16mm. Qualified pellets, the average drop strength of the obtained pellets is 4.4 times, and the compressive strength is 10.5N.

Step 3. Preheating the raw balls

The prepared green pellets were placed in an electric furnace and dried at a temperature of 138°C for 9 minutes, and then preheated at a temperature of 850°C for 17 minutes.

Step 4. Green ball roasting

Continue to heat up the preheated pellets in an electric furnace, and roast them at a temperature of 1000° C. for 25 minutes.

Step 5. Pellet Cooling

The roasted pellets are taken out after being cooled in the furnace. The roasted pellets are high-basicity pellets with a basicity of 2.2 and a compressive strength of 4200N, and qualified high-basicity pellets are obtained.

Claims (9)

1. A kind of 1. blast furnace ironmaking superfluxed pellets, it is characterised in that：The pellet is with fine ore, refining slag and bentonite For made of raw material, and the mass percent of each component is respectively：Fine ore 60-76%, refining slag 22-38%, bentonite 1.5-2.5%.
2. A kind of 2. blast furnace ironmaking superfluxed pellets according to claim 1, it is characterised in that：The basicity of the pellet For 1.9-2.6, compression strength 3100-5000.
3. A kind of 3. blast furnace ironmaking superfluxed pellets according to claim 1, it is characterised in that：In the fine ore TFe mass fraction is 65-70%, CaO and SiO₂Mass fraction be respectively 1-1.5%, 3-3.3%；In the refining slag Containing CaO45-50%, containing SiO₂8-15%；2-3% containing CaO in the bentonite, containing SiO₂68-70%.
4. 4. a kind of production method of blast furnace ironmaking superfluxed pellets as any one of claim 1-3, its feature It is：The superfluxed pellets is using fine ore, refining slag and bentonite as raw material, is obtained through pelletizing, preheating and calcination process Arrive.
5. 5. the production method of a kind of blast furnace ironmaking superfluxed pellets according to claim 4, it is characterised in that specific Comprise the following steps：

   Step 1: raw material with addition of

   Dried after pelletizing raw material fine ore, refining slag and the bentonite of green-ball are ground into powder, then by raw material proportioning Dispensing is simultaneously well mixed, and obtains compound；

   Step 2: pelletizing

   Gained compound progress pelletizing is obtained into green pellets, and filters out the qualified pelletizing that particle diameter is 10-16mm；

   Step 3: green-ball preheats

   It is dried, drying time 7-10min, is subsequently placed at a temperature of the green pellets made first is placed in into 100-200 DEG C Preheated at a temperature of 500-1000 DEG C, preheating time 12-20min；

   Step 4: green-ball is calcined

   Pelletizing after preheating is continued to heat up, is calcined at a temperature of 900-1300 DEG C, roasting time 25-40min, then Taken out after furnace cooling, that is, obtain qualified superfluxed pellets.
6. A kind of 6. production method of blast furnace ironmaking superfluxed pellets according to claim 5, it is characterised in that：It is described Powder drying temperature is 90-110 DEG C in step 1, drying time 2h.
7. A kind of 7. production method of blast furnace ironmaking superfluxed pellets according to claim 5, it is characterised in that：It is described Pelletizing processing is carried out using disc balling machine in step 2, disc balling machine rotating speed is 6-8rad/min, disk tilt angle 45- 48°。
8. A kind of 8. production method of blast furnace ironmaking superfluxed pellets according to claim 7, it is characterised in that：Step The drop strength of gained pelletizing is 3-5 times in two, compression strength 7-11N.
9. 9. a kind of production method of blast furnace ironmaking superfluxed pellets according to any one of claim 5-8, it is special Sign is：Drying, preheating and the roasting process of the pelletizing are carried out in electric furnace.