Tap hole clay blast furnace

Tap hole clay blast furnace

Design principles for anhydrous taphole clay blast furnace

I. Principles for blast furnace use

1. Understand blast furnace parameters. (1) Blast furnace volume (2) Air volume (3) Top pressure (4) Oxygen enrichment (5) Number of iron holes (6) Opening system (7) Required iron hole depth (8) Iron hole angle (9) Average furnace grade. (10) Designed daily output. (11) Expected number of iron tappings. (12) Chemical heat. (13) Normal physical heat. (14) Content of active metals (zinc, potassium, sodium, vanadium, titanium, lead, etc.) in the charge. (15) Slag basicity. Etc. These parameters are important bases for designing the plasticity, refractoriness, apparent porosity, bulk density, sintering speed, medium and low temperature strength, high temperature bending resistance, resistance to slag and iron corrosion, and resistance to physical erosion.

2. Understand tap hole clay blast furnace parameters. (1) Maximum piston thrust, (2) Mud cylinder volume, (3) Mud beating speed, (4) Effective piston stroke, (5) Cylinder working pressure, (6) Mud gun unit working pressure, (7) Static pressure gun force, etc. This is an important basis for designing gun mud Max value, softening speed, and film packaging.

3. Understand the parameters of the opening machine. For example, working pressure, drill bit diameter, drill bit quality, opening system, drill rod feeding speed, maximum stroke, punching energy, rotation speed, maximum torque, cooling method, etc. This is an important basis for designing gun mud sintering strength, bulk density, and expansion coefficient.

4. The design of gun mud should consider the order of physical properties. Marshall value (can be hit) - low temperature sintering (can be blocked, no mud return) - plasticity (enough depth) - refractoriness (little mud loss) - sintering strength (can be opened, no oxygen burning) - micro expansion (no cracking) - bulk density (no iron penetration) - apparent porosity (no wet mud) - anti-scouring (no hole expansion) - anti-slag iron erosion (large slag, no iron mouth collapse, low mud consumption) - environmental protection (no smoke, less toxic gas).

5. Typical components of 5,000 cubic meter blast furnace taphole mud (for reference only). Carbon>6% Alumina>32% Silicon oxide<13% Silicon carbide>17% Ferrosilicon nitride>13% Secasialon>5% Iron oxide<2% Titanium oxide<2% Volatile matter<8% Others<3%

II. Principle of profit maximization

1. First of all, we must distinguish the supply method, whether it is a ton of iron contract or a ton of taphole mud. If it is a ton of iron contract, the main design goal is to use low mud consumption per ton of iron. Under the premise of good opening, try to improve the grade of the taphole mud, with the intention of good iron mouth depth, high resistance to slag iron erosion, appropriate tapping rate, try to increase the single tapping time, reduce the number of tapping times, and use high-grade materials, composite materials and new materials.

If the price is calculated by tons of taphole clay blast furnaces , this is mostly for small blast furnaces. Due to the conditions of the tank position and the tapping plan, there is often no longer tapping time, and there are many furnaces. At this time, we must consider controlling costs to prevent waste caused by high-grade taphole mud. The design purpose is to clean the slag iron, and the tapping time meets the needs of the production plan. It is better to use more mud in a reasonable amount. You can consider using more waste refractory recycled materials and lower-grade raw materials.

2. The selection of raw materials should be accurate, and you should be brave to try new materials. Often the efficacy of new materials will greatly improve product quality, while the cost increase is limited, especially new binders and chemical synthetic materials. Pay attention to the treatment of waste refractory materials and use more recycled materials. Taphole mud is destructive and disposable, which provides the possibility of using a large amount of recycled materials, which can effectively reduce costs and create new employment opportunities. It is also fully in line with the national environmental protection policy, which is beneficial to the country, the people and the enterprise.

3. Reasonably design temperature parameters, such as oil temperature, mud mill temperature, mud extruder temperature, etc., in order to shorten the mud milling time, reduce electricity costs, and increase the income of front-line workers. It is recommended that the oil temperature be 60℃, the mud mill temperature be 70℃, and the mud extruder outlet temperature be 80℃. The particle grading should be reasonable, and trace special additives should be used to increase the material wetting angle, reduce friction, and reduce equipment loss.

III. Simplified process principle

1. The particle grading should be reasonable to provide convenience for crushing, batching, and artificial addition. It is recommended to use 5-level batching, 3mm-1mm, 1mm-0.2mm, 80 mesh-100 mesh, 180 mesh-200 mesh, 325 mesh, excluding admixtures. The ratio of particles to powder is 1:1, and it fluctuates according to the size of the furnace and the sintering time. The aggregate of a small furnace is increased, and the powder of a large furnace is increased. Pay attention to the potassium, sodium, and calcium content of the dust collecting powder. If it exceeds the standard, it can be used for low-grade spray coatings and grouting materials. If these alkali metals are not high, they can be dispersed in the powder and used.

2. The design weight is carried in units of 10Kg as much as possible, and 5Kg is added when necessary. The design formula is issued in percentage form, the process is issued in weight form, and the artificial ingredients of the admixture are set according to needs. The types of artificial ingredients are as few as possible to prevent mistakes.

3. If there is dry material premixing, it is best, and the mixing and grinding method is the same as the ramming material. If not, there is no need to force it. You can use a mud mill instead of dry mixing, and dry mixing for 3-5 minutes.

4. There are two Masha values ​​that can be set. One is 50℃, which is used as a sampling standard. The other is to set the mud temperature according to the company's own habits, such as 70℃ and 65℃, so that the Masha value can be quickly made to guide the mud milling. At the same time, it is clearly told that the Masha value should be used in conjunction with experience, because the Masha value is closely related to the detection link and has certain fluctuations. The design size of the Masha value is based on the thrust of the mud gun (compared with the experience value, it will not be repeated here). The Masha value design index and the combined dosage can be determined through laboratory experiments.

5. Small packages should be thermoplastically packaged as much as possible to avoid bringing in too much air. The mud of each roller is mixed to overcome the defects of individual rollers and prevent the adhesion of mud blocks. It is packaged in ton bags for easy transportation and mud trapping.

6. Pay attention to equipment updating and transformation, try to use automatic batching and automatic packaging, pay attention to dust removal and deodorization, enhance process accuracy, reduce the labor intensity of workers, and make environmentally friendly mud guns.

4. Environmental protection principle

This taphole clay blast furnace a full understanding of the environmental protection policies of steel enterprises and external pressure. Generally speaking, the fewer low-temperature volatiles and low-density substances, the less environmental pressure. Large blast furnaces can completely use special resins as binders, without asphalt or even coke foam. Small blast furnaces should fully consider the operating habits of on-site workers and the focus of the furnace. If the equipment is good, the workers are highly skilled, and have a good habit of drying and blowing the iron mouth, they should consider increasing the stacking density, reducing the porosity, and micro-expansion, so as to achieve continuous leakage, no burning of the iron mouth, and stable iron tapping. On the contrary, the porosity should be increased, and there should be no damp mud to prevent blasting and splashing at the opening. Consider increasing the proportion of aggregates, increasing the amount of coke foam, and reducing asphalt.