RU1836480C - Charge for manufacturing phosphorous ferroalloy - Google Patents

Abstract

Usage: the invention relates to ferroalloy production, and specifically to blends for the production of phosphorous ferroalloy enriched with alloying metals, which can be used as alloys for the production of special cast irons with improved casting properties. SUMMARY OF THE INVENTION: The mixture contains, as a phosphorus-containing component, an intermediate converter phosphate slag in the following ratio of components, May%: intermediate converter phosphate slag 55-60; iron shavings 2-3.5; quartzite 9-10; Coke 28.5-31.5. sl c

Description

The invention relates to ferrous metallurgy, to ferroalloy production, and specifically to blends for the production of phosphorous ferroalloy enriched with alloying metals, which can be used as alloys for the production of special cast iron with improved casting properties, automatic steel, wear-resistant cast iron for brake shoes, as well as to obtain a new class magnetically amorphous soft materials.

The aim of the invention is to improve the quality of phosphorous ferroalloy and reduce the cost of charge materials.

The goal is achieved in that the mixture for producing a phosphorous ferroalloy containing a phosphorus-containing component, iron shavings and coke according to the invention as a phosphorus-containing component contains

intermediate converter phosphate slag In the following ratio of components, wt.%:

Intermediate converter phosphate slag 55-60 Iron chips 2-3.5

Quartzite 9-10

Coke28.5-31.5

The intermediate converter phosphate slag has the following composition, wt.%: 8-12 P20s: 0.6-1.1 VzOs: 6-8 MnO; 10-15 Re: total: 14-18 40-45 CaO; 1-3 ABOz: 6-8 MgO; C is the rest.

At present, the intermediate converter phosphate slag formed during the converter processing of phosphor cast iron into steel, the annual amount of which at the Karaganda Metallurgical Combine is 400 thousand tons, is a waste product. Sufficient slag present

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elements such as phosphorus and iron make it suitable for further processing into a phosphorous ferroalloy. Vanadium, which is present in the slag in the form of pentoxide, during melting of the batch will be wars / sludges and pass into the ferroalloy in the amount of 1.78-2.6%, improving its quality. In addition, it will increase the quality of the alloy manganese, the content of which in the ferroalloy will be 11.3-15.2%.

The presence of alloying elements in the phosphorous ferroalloy makes it possible to significantly expand the scope of its application in comparison with the known technical solutions; to obtain new, more expensive grades of special cast irons and steels, metal-amorphous with magnet of soft materials, which increases the value of the resulting alloy.

The use of an intermediate converter phosphate slag as a phosphorus-containing component can significantly reduce the consumption of scarce iron shavings, by 5.5–9.7 times in comparison with the prototype. This is possible due to the relatively high content of iron in the slag (10-15% versus 3-5% in phosphorite).

Considering that the intermediate converter slag is dump, this also reduces the cost of charge materials.

An important positive factor for the use of intermediate converter phosphate slag is the absence of fluorine impurity in it, which is contained in phosphorite in a significant amount of up to 2%, which eliminates emissions of toxic fluoride compounds into the environment and significantly improves the environmental state of the environment. intermediate converter phosphate slag is 55-60 wt.%. When its content is less than 55%, the quality of the obtained ferroalloy decreases due to a decrease in the content of alloying elements in it, the content of other more expensive charge components increases, which will affect the cost of charge materials. In addition, with an increase in the quartzite content of more than 10%, the acidity of the slag increases, which will entail an increase in viscosity and, consequently, a decrease in the recovery of valuable elements in the ferroalloy, and this will impair its quality. With an increase in the content of iron chips in the charge of more than 3.5%, the content of iron in the alloy increases and, therefore, the content of alloying elements in it decreases, which reduces the quality of the ferroalloy. In addition, iron chips are overused, the raw materials are used irrationally and the costs of charge materials are increased. The coke content also increases, and hence the cost of charge materials.

An increase in the content of intermediate converter phosphate slag in the charge of more than 60% will lead to a decrease in the content of other components of the charge, while the quality of the phosphorous ferroalloy will decrease. Thus, a decrease in the quartzite content in the charge of less than 9% will result in a decrease in the acidity of the slag. In this case, the activity of alloying elements, which are present in the slag as calcium compounds, will decrease; when a sufficient amount of quartzite is introduced, these compounds are destroyed, which increases the activity of the alloying elements and facilitates their extraction into the ferroalloy. Therefore, with a decrease in the quartzite content in the charge of less than 9%, the extraction of these elements into the ferroalloy decreases, which improves its quality. In addition, if the coke content in the charge is reduced to less than 28.5%, the process of recovering valuable elements into the alloy will be incomplete, which will also affect its quality and the raw materials will be used irrationally. If the content of iron shavings in the charge is reduced to less than 2%, this will lead to pollution of the atmosphere and environmental degradation, since free phosphorus will be formed instead of phosphorous ferroalloy due to iron deficiency. Thus, an increase in the content of slag in the charge of more than 60% will lead to the fact that most of the valuable elements of the slag will not be recovered, and the ecologists of the process will significantly deteriorate.

The proposed charge was manufactured and tested in laboratory conditions.

Example 1. An intermediate phosphate slag of the Karaganda metallurgical plant of the following composition, wt.%: 12 PaOs; 1.1 VaCK 8 MnO; 10 General .; 18 SlOa; 40 CaO; 1 A1aOz; 8 MdO; 1.9 C, iron shavings; Tarasov quartzite (95% Si02) and metallurgical coke.

The mixture, which consisted of: 1 kg of intermediate converter phosphate slag, which is 55%; 0.063 kg of iron shavings, which corresponds to 3.5%; 0.182 kg of quartzite - 10% and 0.573 kg of coke - 31.5%, were ground to a particle size of less than 5 mm, thoroughly mixed and loaded into a graphite crucible with a diameter of 320 mm and a wall thickness of 400 mm and melted at a temperature of 1500 ° C for 1 hour.

As a result of smelting, a phosphorous ferroalloy was obtained in an amount of 0.230 kg, which is 12.65% by weight of the initial charge, of the following composition, wt.%: 2.6 V; 15.2 megapixels; 15.1 P; 0.8 Si; 0.5 C; Fe - the rest and slag in the amount of 0.635 kg (composition not analyzed).

According to the prototype, the phosphorous ferroalloy contains, wt.%: 0.5 MP; 15.4 P; 0.475 Si; 0.47 C; Fe is the rest. Thus, the quality of the obtained ferroalloy is much better than that of the prototype, and the consumption of iron chips was reduced by 5.5 times.

Example 2. For the preparation of the charge, an intermediate converter phosphate slag of the following composition was used, wt.%: 10 P20s; 0.9 V2Gs; 7 MnO; 14 Re; 16 SlOa; 43 CaO: 2 7 MgO; 0.1 C, iron shavings, Tarasov quartzite, metallurgical coke,

The mixture, which included: 1 kg of intermediate converter slag, which is 57.34%; 0.0475 kg of iron shavings, which corresponds to 2.62%; 0.177 kg of quartzite - 9.3%; and 0.536 kg of coke - 30.76%, crushed to a particle size of less than 5 mm, thoroughly mixed and loaded into a graphite crucible and melted at a temperature of 1500 ° C for 1 h.

As a result of melting, a phosphorous ferroalloy was obtained in an amount of 0.212 kg, which is 12.11% of the mass of the initial charge, of the following composition, wt.%: 2.38 V; 14.36 megapixels; 16 P; 0.5 Si; 0.2 C; Fe - the rest and slag in the amount of 0.674 kg.

The quality of the obtained ferroalloy is much better than the prototype. The consumption of iron chips was reduced by 7.4 times,

PRI me R 3. For the manufacture of the charge used intermediate converter phosphate slag of the following composition, wt.%: 8P205; 0.6U205; 6MPO; 15Re0bsch .; 14 SiOa; 45 CaO; 3 A120z; 6 MgO; 2.4 s, iron shavings, Tarasov quartzite and metallurgical coke.

The mixture, which included: 1 kg of intermediate converter phosphate slag - 60%; 0.033 kg of iron shavings - 2%; 0.150 kg of quartzite - 9% and 0.475 kg of coke - 28.5%, with a grain size of less than 5 mm, were loaded into a graphite crucible and melted at a temperature of 1500 ° C for 1 h.

As a result of smelting, a phosphorous ferroalloy was obtained in an amount of 0.188 kg, which is 11.34% by weight of the charge being loaded, of the following composition, wt.%; 1.78 V;

11, ZMP; 15.8 P; 0.4 Si; 0.01 C; Fe rest and slag in amounts of about 0.641 kg.

The quality of the obtained ferroalloy is much better than that of the prototype, the consumption of iron chips was reduced by 9.7 times.

The expected economic effect of the use of an intermediate converter phosphate slag in the charge for producing a phosphorous ferroalloy is created from the savings due to the production of a more expensive product - doped phosphorous ferroalloy and by reducing the consumption of steel chips.

Currently, a blast furnace phosphorous ferroalloy is produced in a blast furnace shop.

Staro-Utkin Metallurgical Plant. Therefore, economic efficiency is calculated from the comparison with the prototype and the existing production at STUMZ.

Claims (2)

1. A mixture for producing a phosphorous ferroalloy containing a phosphorus-containing component, iron chips, quartzite and coke, characterized in that, for the purpose of improving the quality of phosphorous ferro. alloy and reduce the cost of charge materials, it contains B as a phosphorus-containing component intermediate converter phosphate slag in the following ratio, wt.%: Intermediate phosphate slag converters 55-60 Iron chips 2-3.5 Quartzite 9-10 Coke28.5-31.5 2. The mixture pop 1, characterized in that the intermediate converter phosphate slag has the following composition, wt.%: P20s8-12 V20s0.6-1.1 MnO6-8 Re0sc. 10-15 SiOa14-18 CaO40-45 A Oz1-3 MgO6-8 OTHER.