Titanium briquette

Our enterprise produces briquettes based on titanium components (ilmenite concentrate) for kish formation in the hearth and bottom.

These briquettes increase the service life of blast furnace lining, they can be used for kish formation of materials with high titanium oxide content (up to 50% ТiO2).

The kish formation on the operating profile exhausted by the furnace provides an increase in the engineering-and-economical performance of the operation.

The use of these briquettes, after the kish formation in the hearth, provides 30-35% reduction in heat losses and bottom providing a reduction of coke consumption by approximately 1 kg/ton of cast iron.

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Production Administration Head
РJSC ArcelorMittal Kryvyi Rih
V.A. Sheremet
22.01.2008

REPORT
on melting of titanium briquettes in blast furnace No. 6 of BFD No. 1

239.3 tons of titanium briquettes (TB) were loaded and melted in blast furnace No. 6 to reduce the thermal loads on crucible coolers and to increase the kish formation thickness.

The values of the product quality indicators are given below. Table 1 shows the data provided by the supplier, Table 2 shows the test data by QCD of РJSC "AMKR".

Table 1
Quality certificate, No.	Mass fraction, %			Compressive strength, MPa
Quality certificate, No.	TiO₂	CaO	SiO₂	Compressive strength, MPa
688	34.5	16.5	11.7	10.7
689	34.5	18.3	12.0	10.4
692	35.5	14.0	11.0	10.2
697	35.5	14.0	12.0	10.3

Table 2
Quality certificate, No.	Mass fraction, %			Compressive strength, MPa
Quality certificate, No.	TiO₂	CaO	SiO₂	Compressive strength, MPa
688	33.0	12.5	13.1	-
689	33.5	12.8	13.0	-
692	34.6	11.8	12.0	-
697	33.0	14.0	12.0	-

Cooling water temperature and thermal loads on crucible coolers were controlled by representatives of the Heat Engineering Laboratory of the Sintering and Blast Furnace Department of CHEL of the Energy Saving and Environment Department at least once a month.

TBs were loaded in BF No. 6 from the 1st furnace burden on 25.12.2007 to the 16th furnace burden on 30.12.2007. Initially, the weight of briquettes was 0.2 t/day from the 1st to the 10th furnace burden, the consumption was changed to 0.5 t/day from the 11th furnace burden, keeping that consumption constant.

Analytical control of cast iron and slag from BF No. 6 for titanium and its oxide content was performed before the melt started.

Ti and TiO2 content in cast iron in the slag was controlled simultaneously with TB loading beginning in the blast furnace to determine the time of its appearance in the products of the melt.

Ti content in cast iron varied from 0.013 to 0.114% and TiO2 in slag from 0.18 to 1.0%.

Titanium briquette — blast furnace lining service life

Si content in cast iron varied within the normal range of 0.42 to 1.11%, mean value amounted to 0.7%.

The blowing and process parameters were within normal limits.

Reporting parameters:	max. value	mean value
Blast rate, m3/min	4726	3824
Hot blast pressure, gauge atmosphere (ga)	2.7	2.4
Top pressure, ga	1.34	0.81
Total pressure differential, ga	1.86	1.6
Upper differential, ga	0.58	0.31
Lower differential, ga	1.56	1.23
Hot blast temperature, ⁰C	1127	986

More detailed display of the reporting parameters of BF No. 6 sensor readings for the period from 25.12.07 to 03.01.2008 is shown in Annex 1.

Chemical composition of cast iron, Ti content in cast iron, TiO2 content in slag and its basicity during TB melting are shown in Table 3.

Table 3
Date	Cast iron (hot) weight, t	Slag output, (theoretic), t	Cast iron chemical composition, %:					Slag basicity, unit	TiO₂ compound in slag, %
Date	Cast iron (hot) weight, t	Slag output, (theoretic), t	Si	Mn	S	P	Ti	Slag basicity, unit	TiO₂ compound in slag, %
25.12	2137.0	1017.0	0.71	0.45	0.018	0.089	0.022	1.18	0.23
26.12	3844.3	1880.4	0.80	0.42	0.020	0.092	0.041	1.16	0.41
27.12	3898.1	1871.4	0.71	0.35	0.018	0.087	0.036	1.15	0.46
28.12	3912.5	1866.3	0.65	0.37	0.019	0.089	0.035	1.20	0.50
29.12	3952.1	1928.6	0.64	0.40	0.018	0.095	0.025	1.20	0.52
30.12	3908.4	1879.9	0.72	0.39	0.018	0.092	0.052	1.20	0.55
31.12	4054.8	1865.2	0.72	0.41	0.015	.0.090	0.064	1.25	0.67
01.01	4035.9	1746.1	0.75	0.33	0.019	.0.087	0.040	1.19	0.46
02.01	3977.9	1717.4	0.75	0.33	0.017	0.084	0.032	1.20	0.34
03.01	1858.5	725.4	0.75	0.37	0.016	0.089	0.034	1.26	0.32

On 14.01.2008 the Heat Engineering Laboratory of the Sintering and Blast Furnace Department of CHEL of the Energy Saving and Environment Department performed control measurements of heat loads on the hearth-cooling staves, upper and lower bottoms before and after the research work.

	Total heat load of the blast-furnace crucible, kcal/h	Total heat load of the upper bottom, kcal/h	Total heat load of the lower bottom, kcal/h
07.12.2007	394850	445410	47590
14.01.2008	357460	436210	40860
Heat load variation, kcal/h	-37390	-9200	-6730

TiO₂ balance for blast furnace No. 6 in BFS No. 1

Date	TiO₂introduced with TBs			Cast iron						Slag
Date	TB consumption, t	TiO₂ compound, %	TiO₂ compound, t	Cast iron production (hot), t	Daily Ti content in cast iron, %	Ti content in cast iron, %	Ti amount in cast iron, t	Ti amount in terms of TiO₂, t	Slag yield (theoretic)		Daily TiO₂ content in slag, %	TiO₂ compound in slag, % **	TiO₂ amount in slag, t
Date	TB consumption, t	TiO₂ compound, %	TiO₂ compound, t	Cast iron production (hot), t	Daily Ti content in cast iron, %	Ti content in cast iron, %	Ti amount in cast iron, t	Ti amount in terms of TiO₂, t	kg/t	t	Daily TiO₂ content in slag, %	TiO₂ compound in slag, % **	TiO₂ amount in slag, t
25.12.07	20.4	33.5	6.83	2137.0	0,022	0,0007	0,15	0,25	476	1017,0	0,23	0,03	0,31
26.12.07	49.0	33.5	16.42	3844.3	0,041	0,026	1,0	1,67	487	1880,4	0,41	0,21	3,93
27.12.07	48.0	33.5	16.08	3898,1	0,036	0,021	0,82	1,36	481	1871,4	0,46	0,26	4,87
28.12.07	48.0	33.5	16.08	3912,5	0,035	0,02	0,78	1,30	477	1866,3	0,50	0,30	5,60
29.12.07	48.0	33.5	16.08	3952,1	0,025	0,01	0,40	0,66	488	1928,6	0,52	0,32	6,17
30.12.07	26.0	33.5	8.71	3908,4	0,052	0,037	1,45	2,41	481	1879,9	0,55	0,35	6,58
31.12.07	-	-	-	4054,8	0,061	0,049	1,99	3,31	460	1852,2	0,67	0,47	8,77
Итого:	239.4		80.2	25707,2	-	-	-	10,96	-	-	-	-	36,23

* — including the background 0.015%

** — including the background 0.2%

TiO₂remainder in the blast furnace as of 31.12.2007:

80.2-10.96-3623-0.05=32.69т

** — we take the amount of TiO₂ in the flue dust, t

Imbalance:

32.96/80.2*100=41.1%

Conclusions

During preparing TiO2 usage balance, it was determined that 22.14 tons of TiO2 (27.6%) remained in BF No. 6 crucible as of January 03, 2008.
During preparing TiO2 usage balance, it was determined that 22.14 tons of TiO2 (27.6%) remained in BF No. 6 crucible as of January 03, 2008.
The advantages of titanium briquettes over sinter with increased titanium content lie in the fact that TB is an additive and does not affect the furnace production, thus creating favourable conditions for varying the loaded mass of TB in the furnace.
A feature of TB is the exclusion of in-house production of titanium materials (sinter) and the costs associated with it.

Head of the Sinter-Blast Furnace Laboratory of the Technical Department – P.A. Vasiuchenko

AGREED

Technical Production Preparation Manager — Head of TD A.V. Kekukh

Chief Blast Furnaceman — A.A. Kolesnick

Deputy Head of TD — Head of the Department of Iron-Ore Materials, Refractories and Fuel Rationing – P.I. Otorvin

Head of Blast Furnace Shop No. 1 G.P. Kostenko

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Titanium briquette

REPORT on melting of titanium briquettes in blast furnace No. 6 of BFD No. 1

TiO2 balance for blast furnace No. 6 in BFS No. 1

Conclusions

REPORT
on melting of titanium briquettes in blast furnace No. 6 of BFD No. 1

TiO₂ balance for blast furnace No. 6 in BFS No. 1