CN1177010A

CN1177010A - Tech. of briquetting ferro alloy

Info

Publication number: CN1177010A
Application number: CN 97115091
Authority: CN
Inventors: 葛光华; 魏其瑞; 李国荣
Original assignee: Individual
Current assignee: Individual
Priority date: 1997-07-31
Filing date: 1997-07-31
Publication date: 1998-03-25

Abstract

The ferro-silicon powder, ferrosilico-manganese powder, ferro-manganese powder of size smaller than 6mm produced during transportation of ferro alloy ingot are added with binder, firming agent, hardening agent and water, then pass through dry mixing, wet mixing, pressing into ingot and drying to obtain alloy ingot, its physical property and chemical composition attain the standard of original ferro alloy. The alloy ingot is saitable for use in the deoxygenation, alloy formation, substitution of original ferro alloyof rotary furnace, electric furnace and cupola. It can reduce the prodn. cost, save energy and increase economical profit.

Description

The briquetting ferro alloy technology

A kind of alloy powder briquetting technology that belongs to the iron alloy field.

The ferrosilicon, ferro-silico-manganese, the manganeseirom that use in steel-making and the casting all require certain lumpiness [60～100mm].The break flour of granularity below 10mm can be produced in Mechanical Crushing and the transportation, the stove melting can't be directly thrown.Shoudu Iron and Steel Co adopts at present ferro-alloy pulverized dirt is crushed to powder below the 0.1mm again, directly drops into electric furnace surface deoxidation usefulness, can only spend the minute quantity ferro-alloy pulverized dirt in every month.Another way is to sell ferroalloy works with 300 yuan/ton, and as waste material a small amount of adding in the electric furnace when the smelting ferroalloy, but current consumption is big, and the bad control of iron alloy composition prolongs smelting time, influences production efficiency.More than two kinds of methods all can only spend a small amount of ferro-alloy pulverized dirt.Shoudu Iron and Steel Co is produced 8000000 tons of steel per year, and ferro-alloy pulverized dirt was nearly 300 tons in every month, can not in time use and transport, long-term ferro-alloy pulverized dirt deliquescence, oxidation, hydrogenation of piling up causes Ordinary Wear and Tear, and brings difficulty for the recycling of ferro-alloy pulverized dirt, take the raw material place, serious environment pollution.

At present, domestic still do not have a ferro-alloy pulverized dirt recoverying and utilizing method preferably.Three kinds of ferro-alloy pulverized dirt process for briquetting that only retrieve only provide water glass or metal chloride to make binding agent, all do not add solidifying agent and stiffening agent, more do not mention the necessity that adds water.Churning time is long in operation, and what have also requires ageing mixture 2～4 hours and seasoning.All there is very big problem in this in theoretical and actually operating kind.The information that does not have iron alloy block production and use producer economic benefit at present.

The technology that the purpose of this invention is to provide a kind of simple ferro-alloy pulverized dirt briquetting.Smail investments and quick rerurn makes full use of the ferro-alloy pulverized dirt waste material, has solved problem of environmental pollution.With generation material processing mode, the price of iron alloy block is significantly less than former iron alloy price, reduces the STEELMAKING PRODUCTION cost, and economic benefit is obvious, in national steel mill, foundry promotion and use value is arranged, and existing details are as follows:

Advantage of the present invention:

1, once strike out piece after, do not change the chemical ingredients of former iron alloy, Mn, Si, C, P, S stable content, mechanical property is close with the standard iron alloy, sees Table one.

Table one

The composition trade mark	Chemical Composition [weight %]					Physicals
	Chemical Composition [weight %]					Physicals		??Mn	??Si	???C	???P	???S	Density [g/cm ³]	Compressive strength [KN]
		Scope	Scope	??≤	??≤	??≤		??Mn	??Si	???C	???P	???S	Density [g/cm ³]	Compressive strength [KN]
?Mn60Si14		Scope	Scope	??≤	??≤	??≤		?60-70	?14-17	?2.5	??0.30	??0.04	??5.5-6.0
?Mn60Si14	The Si-Mn briquetting	?54-58	?14-17	?2.5	??0.20	??0.04	??4.0	?60-70	?14-17	?2.5	??0.30	??0.04	??5.5-6.0		??＞10KN

2, go into stove in the steel-making later stage, Si-Mn briquetting Si, Mn specific absorption meet service requirements, and smelting component meets the steel grade regulation.

3, briquetting ferro alloy does not have broken phenomenon in transportation with in using, and does not exist secondary to produce the bits problem, and the briquetting ferro alloy lumpiness satisfies throws stove fusing requirement.

4, the briquetting ferro alloy production technique is grasped easily, and cost is low, and equipment is simple, and economic benefit is obvious.

Method of the present invention:

1, raw material

The ferro-alloy pulverized dirt that 6mm is following.

2, ratio of components

Water glass 6～12%, the oxide compound 2～4% of basic metal, alkaline-earth metal, water 5～10%.

3, batch mixing

Do mixed, back wet mixing earlier, stir.

4, punching press

Strike out piece after the wet mixing immediately, the air-set drying is work in-process.

5, oven dry

Work in-process iron alloy briquetting was dried 3～5 hours in 200～350 ℃ of dry cellars for storing things, go out the cellar for storing things and be the briquetting ferro alloy finished product, can be directly used in steel-making and change iron.

Technical process:

Sieve material → batching → batch mixing → punching press → oven dry.

Embodiment:

1, steel-making test

Shoudu Iron and Steel Co first steelworks, once in June, 1996 and December, 4 tons and 30 tons of ferro-silico-manganese briquettings on probation respectively, trial state is as follows:

A, test steel grade Q235B, the composition contrast sees Table two.

Table two

		??Mn	??Si	??C	??P	??S
		??Mn	??Si	??C	??P	??S	The Si-Mn alloy	Mean value	??0.47	??0.20	??0.16	?0.017	??0.024
Scope	??0.4- ??0.57	??0.12- ??0.29	??0.13- ??0.21	?0.01- ?0.026	??0.015- ??0.030			Mean value	??0.47	??0.20	??0.16	?0.017	??0.024
Scope	??0.4- ??0.57	??0.12- ??0.29	??0.13- ??0.21	?0.01- ?0.026	??0.015- ??0.030	Si-Mn break flour briquetting		Mean value	??0.52	??0.21	??0.14	?0.017	??0.025
Scope	??0.33- ??0.59	??0.12- ??0.30	??0.11- ??0.19	?0.011- ?0.032	??0.010- ??0.031			Mean value	??0.52	??0.21	??0.14	?0.017	??0.025

To the not influence of Chemical Composition of steel, and sulfur-bearing [S] amount also slightly reduces.The specific absorption contrast of b, alloy sees Table three.

Table three

	The specific absorption of Si	The specific absorption of Mn
	The specific absorption of Si	The specific absorption of Mn	The Si-Mn alloy	????75％	????90％
Si-Mn briquetting	Mould is annotated 69.15% slab 72.27%	Mould is annotated 92.83% slab 85.7%	The Si-Mn alloy	????75％	????90％

2, economic benefit

Draw the ferro-silico-manganese that every 11Kg ferro-silico-manganese briquetting is equivalent to 9Kg from smelting test of Q235B steel grade and effective ingredient analysis.1800 yuan/ton of ferro-silico-manganese briquettings, 4504 yuan/ton of ferro-silico-manganeses, steel per ton is economized on the use of funds:

9 * 4.504-11 * 1.800 ≈ 20.7[units]

Used 50 tons of ferro-silico-manganese briquettings as if every month, can make steel 6040 tons, then month saving is 125000 yuan, and the loss of deduction 5% is then saved 118750 yuan, can save every year and prop up 142.5 ten thousand yuan.

Claims

1, a kind of technology that is applicable to the alloy break flour briquetting in iron alloy field, its technical characterictic is:

A, following ferrosilicon break flour, ferro-silico-manganese break flour, ferromanganese break flour, the rare earth alloy break flour of employing 6mm.

B, add 6～12% water glass and make binding agent, add 2～4% basic metal simultaneously, the oxide compound of alkaline-earth metal is made solidifying agent and stiffening agent, also need add 5～10% water.

C, alloy break flour strike out the alloy block of Φ [50～55] * 55mm after the dry blend wet mixing.

Must in 200～350 ℃ cellar for storing things, dry 3～5 hours after d, the rammed alloy block seasoning sclerosis, to complete drying.

2, briquetting ferro alloy technology according to claim 1 is characterized in that:

Need sieve apparatus, stirrer, stamping machine, dry cellar for storing things etc. when adopting the power operation mode, all belong to general-purpose equipment.

3, according to claim 1 and 2 described briquetting ferro alloy technology, it is characterized in that:

Prepared briquetting ferro alloy is applicable to steel-making and casting.

4, briquetting ferro alloy technology according to claim 1 is characterized in that:

Modulus of water glass M=2.2～2.5, proportion 1.53～1.55g/cm ³