CN101709353B - Composite sulfur removal material for cast iron and preparation method thereof - Google Patents

Abstract

The invention provides a low-cost composite sulfur removal material for cast iron with excellent environmental protection performance and good sulfur removal performance and a preparation method thereof. The composite sulfur removal material comprises the following components in percentage by mass: 7 to 9 percent of Al2O3, 0.12 to 0.18 percent of V2O3, 4 to 6.5 percent of MgO, 13 to 16 percent of SiO2, 12 to 14 percent of TiO2, 0.001 to 0.01 percent of CeO2, and the balance of CaO. The preparation method thereof comprises the following steps: mixing the materials; putting the mixed materials into a stirrer, adding water into the materials, taking the materials out after uniformly mixing for 10 to 15 minutes, and putting the materials into a sintering furnace; controlling the sintering heating temperature to between 1,150 and 1,230 DEG C, and preserving the heat for 2 to 4 hours; and cooling the materials together with the furnace to room temperature, and grinding the materials into powder between 0.03 and 0.06 microns to obtain the composite sulfur removal material. The preparation method is simple; the production cost is low; and the composite sulfur removal material is suitable for industrialized production.

Description

Composite sulfur removal material for cast iron and preparation method thereof

One, technical field:

The present invention relates to a kind of sweetening material, be specifically related to a kind of titaniferous vanadium sweetening material that is used for cast iron, belong to the materials processing technology field.

Two, background technology:

Use sweetening agent in the Cast Iron Production, guarantee casting quality.89108179.8 a kind of iron melt desulfurizing agent that contains carbide of calcium and metal component is provided, and the carbide of calcium wherein and the volume density of metal component and particle size are in same range as.90105599.9 propose a kind of cast steel, cast iron refining agent, form by raw materials such as calcium carbide, fluorite, sodium-chlor, oryolites.

94111848.7 relate to a kind of iron melt desulfurizing agent, this sweetening agent mainly contains CaO or CaCO3, NaCl, BaCO3, CaCl2 and Na2CO3.Its method be in iron bath by molten iron per ton add 8～12Kg sweetening agent and molten iron mix towards or when going out molten iron, dust to molten iron and can reach the desulfurization purpose by molten iron 3～5kg sweetening agent per ton.This sweetening agent can be sloughed the sulphur of making an appointment with half in the molten iron.

98113413.0 relate to a kind of desulfurizing agent for smelting iron and steel, it comprises the by product aluminium ash in aluminium powder, alkaline earth salt and/or alkaline earth metal oxide, organic binder bond and the electrolytic aluminum process.The present invention not only cost lower, use economically, and the slag fusing point that the present invention is produced when using is lower, better mobile.Be convenient to remove, thus the work-ing life of having improved steel teeming ladle.Organic binder bond among the present invention is except that playing cohesive action in addition, and also gasifiable back forms the environment of partial reduction atmosphere, prevents that molten steel from reoxidizing.

01114232.4 invention is a kind of compound iron melt desulfurizing agent.The weight percent of this sweetening agent composition is: all the other are impurity for CaC2 36-48 CaO 32-44 CaF2 3-7C 3-7 Mg 0-7, more than each composition weight sum be 100%.Impurity comprises SiO2MgO, Al2O3, CO2.

200910080870.3 be characterised in that and use desulfurized powder and straight iron powder through ball milling mixing, briquetting; Desulfurized powder micron, nano powder, straight iron powder is a binding agent, uses less than 250 purpose micron iron powders, the weight ratio of straight iron powder and desulfurized powder is (4～10): 1; Desulfurized powder comprises CaCO3 powder, CaO powder, CaF powder, Ca powder, magnesium powder.The present invention plays the pre-dispersed effect of desulfurized powder with straight iron powder and desulfurized powder when the ball milling, makes desulfurized powder be difficult for being agglomerated into macrobead.Increase reaction interface with S.Straight iron powder and desulfurized powder briquetting have increased proportion, help desulfurized powder is slipped in the steel fusant, make it directly not float in the slag, have improved desulfuration efficiency.When being desulfurized powder with the CaCO3 powder, the CaO after the decomposition fully contacts with S and generates CaS, and attached on the CO2 bubble, CO2 gas come-up has removed the S in the melt, has purified melt.

There are the following problems for above sweetening agent: carbide of calcium or calcium carbide use safety inadequately, are difficult to storage and transport.CaCO3, BaCO3 also need to decompose again, and the treatment time is long, weak effect.Na2CO3 is fuming seriously, pollutes Working environment.Wall is wrapped in the fluorite corrosion, sweetening effectiveness is poor; Use sodium-chlor, oryolite to bring smog, influence Working environment.Ca powder, aluminium powder, magnesium powder cost height, and be easy to oxidizedly, and poly-slag is poor.

Three, summary of the invention:

The objective of the invention is to solve defective of the prior art, provide that a kind of cost is low, the environment protection performance is good and composite sulfur removal material for cast iron that desulfurization performance is good.

Another object of the present invention provides the preparation method of above-mentioned cast iron sweetening material, and this technology is simple, and production cost is low, is suitable for suitability for industrialized production.

The objective of the invention is to realize by following measure:

A kind of composite sulfur removal material for cast iron is characterized in that, the quality percentage composition of each component in this sweetening material is: Al ₂O ₃7-9%, V ₂O ₃0.12-0.18%, MgO 4-6.5%, SiO ₂13-16%, TiO2 12-14%, CeO ₂0.001-0.01%, all the other are CaO.

The preparation method of composite sulfur removal material for cast iron of the present invention is characterized in that, may further comprise the steps:

1) with Al ₂O ₃Powder, V ₂O ₃Powder, CeO ₂Powder, MgO powder, CaO powder, TiO ₂Powder, SiO ₂Powder carries out weigh batching: Al by the quality percentage composition of each composition in the cast iron sweetening material ₂O ₃7-9%, V ₂O ₃0.12-0.18%, MgO 4-6.5%, SiO ₂13-16%, TiO ₂12-14%, CeO ₂0.001-0.01%, all the other are CaO.；

2) material for preparing is put into agitator, the speed of mixing is 960-1200 rev/min, adds the water account for material gross weight 2-5% then in material, and water and material take out after by uniform mixing 10-15min, put into sintering oven;

When 3) the sintering Heating temperature was 1150-1230 ℃, soaking time was 2-4 hour; Cool to room temperature after soaking time reaches with the furnace, it is milled to 0.03-0.06 micron powder, promptly obtain the cast iron sweetening material.

Compared with prior art, the present invention has following beneficial effect:

Composite sulfur removal material for cast iron of the present invention has following advantage as cast iron desulphurising agent:

1, do not change the composition of cast iron solution;

2, add-on is few, only is the 2-3 ‰ of weight of molten iron, and poly-slag performance is good;

3, slag is a fragility, is not tied up with, and is convenient to remove purification iron and steel water;

4, heat preservation and insulation is good, reduces heat and scatters and disappears, and makes the iron and steel water for cooling low;

5, free from dust, minimizing environmental pollution are improved working conditions;

6, can improve casting quality, reduce waste product, increase operation rate, reduce cost;

7, has good sweetening effectiveness;

8, easy to operate, with low cost.

Composite sulfur removal material for cast iron of the present invention is owing to only use the ordinary oxide material, and cost is low; Do not use hazardous and noxious substances in the composite sulfur removal material, can not occur the smog producing as using sodium-chlor, oryolite in the use, the environment protection performance is good, and desulfurization performance is good.

Four, description of drawings:

The micro-organization chart of the composite sulfur removal material for cast iron that Fig. 1 obtains for the embodiment of the invention five.

Five, embodiment:

Below among each embodiment used part be weight part.

Embodiment one:

Batching: Al ₂O ₃7 parts, V ₂O ₃0.12 part, 4 parts of MgO, SiO ₂14 parts, TiO ₂12 parts, CeO ₂0.001 part, 62.879 parts of CaO.

Al with above-mentioned weight ₂O ₃Powder, V ₂O ₃Powder, CeO ₂Powder, MgO powder, CaO powder, TiO ₂Powder, SiO ₂Powder prepares mixing; (each raw material powder is commercial, and each fineness of powder is generally the 180-200 order.)

2) material for preparing is put into agitator, the speed of mixing is 960-1200 rev/min, adds the water account for material gross weight 2-5% then in material, and water and material take out after by uniform mixing 10-15min, put into sintering oven;

When 3) the sintering Heating temperature was 1150-1230 ℃, soaking time was 2-4 hour; Cool to room temperature after soaking time reaches with the furnace, it is milled to 0.03-0.06 micron powder, promptly obtain composite sulfur removal material for cast iron.

Embodiment two:

Batching: get Al ₂O ₃9 parts, V ₂O ₃0.18 part, 6.5 parts of MgO, SiO ₂13 parts, TiO ₂14 parts, CeO ₂0.003 part, 57.317 parts of CaO, each powder mixes batching; Its preparation process is with embodiment one.

Embodiment three:

Batching: get Al ₂O ₃7 parts, V ₂O ₃0.18 part, 4 parts of MgO, SiO ₂14 parts, TiO ₂12 parts, CeO ₂0.01 part, 62.81 parts of CaO; Each powder mixes batching; Its preparation process is with embodiment one.

Embodiment four:

Batching: get Al ₂O ₃8 parts, V ₂O ₃0.15 part, 5 parts of MgO, SiO ₂14 parts, TiO ₂13 parts, CeO ₂0.007 part, 59.843 parts of CaO; Each powder mixes batching; Its preparation process is with embodiment one.

Embodiment five:

Batching: get Al ₂O ₃7 parts, V ₂O ₃0.12 part, 6.5 parts of MgO, SiO ₂16 parts, TiO ₂14 parts, CeO ₂0.008 part, 56.372 parts of CaO; Each powder mixes batching; Its preparation process is with embodiment one.

Organizing as shown in Figure 1 of the cast iron sweetening material that present embodiment obtains, as seen from the figure, its mixture is evenly tiny.

Experimental data

Be sprinkling upon the molten iron surface of hot metal ladle uniformly with the composite sulfur removal material for cast iron that accounts for molten iron 0.5%.Stop after 10 minutes, remove whole slags.Following table is the index parameter of the cast iron deslagging agent of different components, and wherein contrast material is not for containing MgO, V ₂O ₃And TiO ₂Material.Product 1-product 4 is for adopting the resulting product of the technology of the present invention.

The alloy numbering	Chemical ingredients consists of (weight percent)	Slag band iron amount kilogram/1 ton of slag	Desulphurizing ratio/%
				Contrast material	Al 2O 3?7-9％，SiO 213-16%, all the other are CaO	50-70	25
Product 1	The product that obtains as embodiment one	10	88
				Product 2	The product that obtains as embodiment two	3	95
Product 3	The product that obtains as embodiment three	6	93
				Product 4	The product that obtains as embodiment four	5	91

As seen from the above table, cast iron does not contain MgO, V with matrix material ₂O ₃And TiO ₂, slag band iron amount height, the separation performance of slag and molten iron is poor.Along with MgO, V ₂O ₃And TiO ₂The increase of content, slag band iron amount reduces, and tangible sweetening power is arranged.

Mainly increased the composition of titanium vanadium among the present invention mutually, micro-CeO ₂And V ₂O ₃With TiO ₂Can make Al ₂O ₃, TiO ₂, SiO ₂, the aggregation that forms of CaO and MgO, the surface tension of molten iron obtains changing relatively thus, has improved the separation property of slag and molten iron;

Al ₂O ₃, SiO ₂With basic oxide TiO ₂, the aggregation that forms of MgO, CaO, its volume raises with temperature and expands, and has certain viscosity, slag, the impurity on molten iron surface can be sticked together, and plays poly-slag slagging-off effect;

Al ₂O ₃, TiO ₂, SiO ₂Low (thermal conductivity of general desulfurization slag is 0.8-2.5W/mK with the thermal conductivity of the aggregation of formation such as MgO; Aggregation thermal conductivity of the present invention is 0.2-0.7W/mK), can effectively prevent thermal conduction, the thermal radiation on molten iron surface, have insulation effect;

TiO ₂, and V ₂O ₃In positively charged ion can activate positively charged ion among MgO and the CaO, promoted desulfidation.And CeO ₂Help MgO, V ₂O ₃And TiO ₂In Ti ion, V ion and the effect of Mg ionic.

Claims (2)

1. a composite sulfur removal material for cast iron is characterized in that, the quality percentage composition of each component in this sweetening material is: Al ₂O ₃7-9%, V ₂O ₃0.12-0.18%, MgO 4-6.5%, SiO ₂13-16%, TiO ₂12-14%, CeO ₂0.001-0.01%, all the other are CaO.

2. the preparation method of the described composite sulfur removal material for cast iron of claim 1 is characterized in that, may further comprise the steps:

1) with Al ₂O ₃Powder, V ₂O ₃Powder, CeO ₂Powder, MgO powder, CaO powder, TiO ₂Powder, SiO ₂Powder carries out weigh batching: Al by the quality percentage composition of each composition in the cast iron sweetening material ₂O ₃7-9%, V ₂O ₃0.12-0.18%, MgO 4-6.5%, SiO ₂13-16%, TiO ₂12-14%, CeO ₂0.001-0.01%, all the other are CaO;

2) material for preparing is put into agitator, the speed of mixing is 960-1200 rev/min, adds the water account for material gross weight 2-5% then in material, and water and material take out after by uniform mixing 10-15min, put into sintering oven;

When 3) the sintering Heating temperature was 1150-1230 ℃, soaking time was 2-4 hour; Cool to room temperature after soaking time reaches with the furnace, it is milled to 0.03-0.06 micron powder, promptly obtain the cast iron sweetening material.

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