CN105274326A - Method for preparing sintered materials through steelmaking bulk material ash - Google Patents

Abstract

The invention provides a method for preparing sintered materials through steelmaking bulk material ash. The raw material includes the steelmaking bulk material ash and dust sludge, wherein the steelmaking bulk material ash includes 40%-46% of CaO4, 14%-20% of MaO, 5%-10% of SiO2, 2.5%-4.5% of Al2O3 and 15%-23% of burning losses. The dust sludge mainly includes 54%-56.5% of TFe, 9%-11% of CaO, 1.5%-3.5% of MaO, 4.5%-6.5% of SiO2, 1%-2% of Al2O3, 2.5%-5.5% of C, 0.03%-0.10% of P, 3.0%-5.0% of burning losses and 6%-8% of water. The steelmaking bulk material ash accounts for 1.0%-2.0% of the dust sludge by mass. The mixture obtained after mixing the steelmaking bulk material ash with the dust sludge is fed through a disc feeder and is mixed with other sintered materials, wherein the mixture accounts for 14%-16% of the total mass of the sintered materials. By means of the method, environmental pollution is reduced, the steelmaking bulk material ash is recycled, and the sintering cost is reduced.

Description

A kind of method utilizing steel-making bulk cargo ash to prepare sintered material

Technical field

The invention belongs to raw materials for sintering field, be specifically related to a kind of method of steel-making bulk cargo ash as sintered material utilizing Using Metallurgical Solid Wastes.

Background technology

In recent years, along with the expansion of China's Iron And Steel Industry production capacity, the quantity discharged of metallurgical dust sludge also gets more and more, and recovery and the utilization of dirt mud have become the ubiquitous common problem of enterprise.Current most of producer selects dirt mud to be directly used in SINTERING PRODUCTION, but it easily causes fluctuation to production process.

In steelmaking process, need to bulk cargos such as converter feeding lime stone, shoddye agent, rhombspar, lime and wagnerites, when these bulk cargos are transported by belt, dust is produced because of vibrations, belt defect and two sections of belt interface drops, enter dust tank after being collected by dust-removal system, these dust scenes are referred to as bulk cargo ash.

Large steel-making plant produces more than 10,000 ton of bulk cargo ash every year, if delivery system is outmoded or run in spite of illness, output can be more.The CaO content of bulk cargo ash is 38% ~ 46%, and content of MgO is at 9% ~ 23%, SiO ₂content is at 5% ~ 11%, Al ₂o ₃content is 2.5% ~ 5%.Because its main component is CaO and MgO, sometimes also slightly poor than Wingdale, be powdery in addition, not easily utilize, process bulk cargo ash becomes a difficult problem of each iron and steel enterprise.

Some Enterprises is considered using bulk cargo ash as sintering plant or desulfurizer for thermal power plant, but because CaO content in bulk cargo ash is low, activity is not high, desulfurization does not reach effect and finally selects to abandon.Also there are some enterprises to select bulk cargo ash to be used as sintered material, but make a gesture of measuring too little, dust blanking difficulty mutually because of itself and other raw materials for sintering and abandon using.

There are some small businesss around some steel mills for cost consideration, some bulk cargo ashes can be bought with very low price, but most of steel enterprise are difficult to find market, and can only select landfill.Enter field condition because bulk cargo ash does not meet garbage loading embeading, finally can only pile up at the scene or arbitrarily abandon, cause solid waste environmental pollution.Also have some steel to look forward to that bulk cargo ash is bundled bid together with other wastes to take out, if bid winner gets the bid, must be responsible for process bulk cargo ash, steel enterprise pays some trucking costs sometimes, but this treatment process is not long-term plan, bulk cargo ash is often made to be absorbed in the condition that nobody want, cannot process.

Therefore, how to process bulk cargo ash, reduce solid waste environmental pollution, realize the recycling of bulk cargo ash, become a key and the problem demanding prompt solution of bulk cargo ash comprehensive utilization.

Summary of the invention

The invention provides a kind of method utilizing steel-making bulk cargo ash to prepare sintered material, its object one is the problem solving steel-making bulk cargo ash fouling environment; Two is make steel-making bulk cargo ash be recycled utilization, reduces sintering cost.

For this reason, the solution that the present invention takes is:

Utilize steel-making bulk cargo ash to prepare a method for sintered material, its concrete technology and step are:

1, raw material prepares

Described raw material comprises steel-making bulk cargo ash and dirt pug.

CaO40% ~ 46% in steel-making bulk cargo ash, MgO14% ~ 20%, SiO ₂5% ~ 10%, Al ₂o ₃2.5% ~ 4.5%, scaling loss 15% ~ 23%.

The main component of dirt pug is TFe54% ~ 56.5%, CaO9% ~ 11%, MgO1.5% ~ 3.5%, SiO ₂4.5% ~ 6.5%, Al ₂o ₃1% ~ 2%, C2.5% ~ 5.5%, P0.03% ~ 0.10%, scaling loss 3.0% ~ 5.0%, moisture 6% ~ 8%.

2, proportioning raw materials

It is 1.0% ~ 2.0% that steel-making bulk cargo ash accounts for dirt pug massfraction.

3, raw material pre-mixing

After being mixed with dirt pug by steel-making bulk cargo ash, the compound of formation is as raw materials for sintering.

4, cutting mode

Above-mentioned compound is carried out blanking by the disk feeder sintering feeder system, and compound accounts for 14% ~ 16% of raw materials for sintering total mass mark, enters sinter machine with other raw materials for sintering iron ore, magnesite, Wingdale, coke powder together with unslaked lime.

Compared with the prior art, principal feature of the present invention is:

(1) steel-making bulk cargo ash is fully utilized, while its noxious waste pollution of elimination, can suitably reduce sintering cost, realize the recycling of steel-making bulk cargo ash.

(2) ratio that bulk cargo ash of making steel accounts for dirt pug is very little, and it is also little that gained dirt pug accounts for raw materials for sintering ratio, thus sintering proportioning is not by the impact of steel-making bulk cargo ash quantity fluctuation.

(3) bulk cargo ash of making steel mixes with revolving furnace mud mutually with the gas mud in dirt pug, lumps gas mud and revolving furnace mud can be made to become powder by digestion, more easily mix.

(4) steel-making bulk cargo ash and other dirt pug are carried out mixing rear blanking, solve the problems such as steel-making bulk cargo ash quantity is little, interval feed, blanking difficulty, Yi Qichen.

Beneficial effect of the present invention is:

Utilize steel-making bulk cargo ash and other dirt mud to mix, as raw materials for sintering, overcoming steel-making bulk cargo ash separately as measuring the problems such as little, interval feed, blanking difficulty, Yi Qichen during raw materials for sintering, hardness and the moisture of dirt mud can be adjusted, play respective strong point.While resolving steel-making bulk cargo ash fouling environmental problem, it can be made again to be recycled utilization, to reduce sintering cost, for the process of steel-making bulk cargo ash provides a kind of method, there is certain economic benefit, social benefit and environmental benefit.

Embodiment

Embodiment steel-making bulk cargo used ash component sees the following form 1; Dirt pug composition is in table 2; Other sintered material component content is in table 3.

Table 1 makes steel bulk cargo ash component and mass percentage

Composition	CaO	MgO	SiO 2	Al 2O 3	S	P	Scaling loss
								Content (%)	41.43	21.92	5.68	1.68	0.11	0.08	29.1

Table 2 dirt pug main component and mass percentage

Composition	TFe	FeO	SiO 2	Al 2O 3	CaO	MgO	K	Scaling loss
									Content (%)	52.49	19.94	4.92	1.08	5.97	1.52	0.29	4.15

Other raw materials for sintering composition of table 3 and mass percentage (%)

Composition	TFe	FeO	SiO 2	Al 2O 3	CaO	MgO	K	Scaling loss
									Return mine	56.01	8.28	4.85	1.61	10.65	2.07		0
Magnesite	0.00	0.00	7.54	0.56	2.02	43.51	0.066	45.18
									Wingdale	0.00	0.00	2.46	0.63	51.97	1.1	0.25	41.94
Coke powder	0.00	0.00	8.23	4.41	0.81	0.21		86.54
									Unslaked lime	0.00	0.00	2.69	0.77	65.35	3.07	0.13	25.90
Powdered iron ore A	60.87	1.62	3.91	2.31	0.3	0.14	0.042	6.53
									Powdered iron ore B	61.70	1.08	5.86	1.75	0.31	0.15	0.037	2.57
Powdered iron ore C	65.89	23.53	7.45	0.34	0.21	0.13	0.022	0.18

Composition according to bulk cargo ash, iron-bearing material, flux, fuel carries out charge calculation, and total amount is 54kg, and basicity controls 2.0.Proportion scheme is in table 4.Steel-making bulk cargo ash and dirt pug are mixed, then mixes with other raw materials for sintering, digest the 800 ~ 1000ml that adds water, add water 2500 ~ 3200ml while stirring in mixing process, carry out sintered cup experiment.Sintered cup experimental result is in table 5.

Table 4 sintered material scheme

Bulk cargo ash accounts for dirt mud percentage ratio	Benchmark (0%)	Embodiment 1 (1.0%)	Embodiment 2 (1.5%)	Embodiment 3 (2.0%)
					Return mine kg	9.450	9.450	9.45	9.45
Magnesite kg	0.77	0.74	0.72	0.70
					Wingdale kg	4.75	4.71	4.69	4.66
Coke powder kg	1.68	1.68	1.68	1.68
					Unslaked lime kg	1.13	1.13	1.14	1.14
Powdered iron ore A kg	2.72	2.72	2.72	2.73

Powdered iron ore B kg	5.43	5.44	5.45	5.45
					Powdered iron ore C kg	21.28	21.32	21.34	21.36
Dirt pug kg	6.79	6.74	6.71	6.68
					Steel-making bulk cargo ash kg	0.000	0.068	0.102	0.136

Table 5 sintered cup experimental result

Benchmarks in table 5, does not add steel-making bulk cargo ash, and embodiment 1,2,3 is respectively with addition of accounting for dirt mud mass percent 1.0%, 1.5%, 2.0% steel-making bulk cargo ash.From test-results, all results adding steel-making bulk cargo ash are suitable with the result do not added, and some index outline is good, therefore can reach a conclusion, and can be used as raw materials for sintering after steel-making bulk cargo ash mixes mutually with dirt pug, and the recycling of bulk cargo ash is made steel in realization.

Claims (1)

1. utilize steel-making bulk cargo ash to prepare a method for sintered material, it is characterized in that, its concrete technology and step are:

(1) raw material prepares

Described raw material comprises steel-making bulk cargo ash and dirt pug;

CaO40% ~ 46% in steel-making bulk cargo ash, MgO14% ~ 20%, SiO ₂5% ~ 10%, Al ₂o ₃2.5% ~ 4.5%, scaling loss 15% ~ 23%;

The main component of dirt pug is TFe54% ~ 56.5%, CaO9% ~ 11%, MgO1.5% ~ 3.5%, SiO ₂4.5% ~ 6.5%, Al ₂o ₃1% ~ 2%, C2.5% ~ 5.5%, P0.03% ~ 0.10%, scaling loss 3.0% ~ 5.0%, moisture 6% ~ 8%;

(2) proportioning raw materials

It is 1.0% ~ 2.0% that steel-making bulk cargo ash accounts for dirt pug massfraction;

(3) raw material pre-mixing

After being mixed with dirt pug by steel-making bulk cargo ash, the compound of formation is as raw materials for sintering;

(4) cutting mode

Above-mentioned compound is carried out blanking by the disk feeder sintering feeder system, and compound accounts for 14% ~ 16% of raw materials for sintering total mass mark, enters sinter machine with other raw materials for sintering iron ore, magnesite, Wingdale, coke powder together with unslaked lime.