Технологический процесс выплавки стали в АО «АрселорМиттал Темиртау состоит из трех этапов: выплавка полупродукта в конвертере, внепечная обработка на установке ковш-печь и получения сляба на машине непрерывной разливки заготовки. По существующей технологии создание нужной жидкоподвижности рафинирующего шлака на установке ковш-печь осуществляется присадками в качестве разжижителя плавикового шпата. При применении плавикового шпата токсичные выделения фтора создают на рабочей площадке напряженную экологическую обстановку. Присутствие фтористых соединений в шлаке отрицательно влияет на стойкость футеровки ковша. Использование твердых шлаковых смесей на основе оксида алюминия на установке ковш-печь позволяет, не меняя технологического процесса и расхода шлакообразующих (извести), устранить: выделения фтора в атмосферу цеха, отрицательное влияние на стойкость шлакового пояса футеровки ковша, снизить себестоимость стали из-за отказа от применения плавикового шпата и снижения расхода алюминия, используемого для раскисления шлака. The technological process of steel smelting at ArcelorMittal Temirtau JSC consists of three stages: intermediate melting in a converter, outoffurnace treatment at a ladle-furnace unit and slab production at a continuous casting plant. According to the existing technology, the creation of the necessary fluidity of the refining slag at the ladle-furnace unit is carried out by adding fluorspar as a diluent. When fluorspar is used, toxic fluoride emissions create a stressful environment in the workplace. The presence of fluoride compounds in the slag adversely affects the durability of the ladle lining. The use of solid slag mixtures based on alumina on the ladle-furnace unit makes it possible, without changing the technological process and the consumption of slag-forming (lime), to exclude: fluorine emission into the atmosphere of the shop, negative influence on the durability of the ladle lining slag belt, reducing the cost of steel due to the abandonment of fluorspar and reducing the consumption of aluminum used for slag deoxidation.

The technological process of steel smelting at “ArcelorMittal Temirtau” JSC includes three stages: converter smelting of semi-finished products, ladle treatment, and continuous casting of slabs. According to the current technology, a desired flowability of the refining slag is created in the ladle-furnace unit by thinner additives, such as fluorspar. When using fluorspar, toxic fluorine emissions aggravate the environmental situation at the worksite. In addition, the presence of fluoride compounds in the slag adversely affects the durability of the ladle lining. Without modifying the technological process and the consumption of slag-forming agents (lime), solid slag mixtures, based on aluminum oxide, can be used in the ladle-furnace unit to eliminate fluorine emissions into the workshop atmosphere, neutralize the negative effect on the resistance of the ladle lining slag belt, as well as reduce the cost of steel due to the refusal of fluorspar and reduced consumption of aluminum for slag deoxidization.

High quality steels have a low sulfur content. Steel is purified from sulfur by treating it with highly basic slags. Scarce fluorspar is used to provide slags with the required fluidity, which decomposes during smelting with the liberation of toxic fluorine into a workshop atmosphere. Alumina is also a thinner for highly basic slags, which is present in sufficient concentrations in aluminothermic production slags that are sent to landfill and create pressure on the environment. Slag dumps are "technogenic deposits" that can be a raw material base. In particular, industrial ferroalloy slags with a high alumina content may be used to prepare a thinning slag-forming mixture that can be used in steelmaking instead of scarce fluorspar. Preparation of a slag-forming mixture from waste slag will reduce the environmental pressure on slag dumps and their use as a slag thinner during steel refining in the working area of a steelmaking workshop by eliminating toxic fluorine emissions released during fluorspar decomposition. Replacement of scarce fluorspar with a slag-forming mixture in steelmaking will reduce steel cost by lowering aluminum consumption for slag deoxidation.

Physico-chemical properties of the oxide system NaI-SiO2-MgO-Al2O3-B2O3 (slag viscosity, its refining properties and interfacial distribution of boron) were researched. Rational composition of boron-containing slag and method of slag formation in the ladle-furnace using lime, aluminum and colemanite, containing B2O3 up to 40%, were developed. Processing a low carbon steel by slags provided content of boron in the steel 0,001-0,012%, sulfur concentration in the metal not more than 0,005-0,010%, decreased consumption of manganese ferro-alloys from 0.2 to 1.3 kg/ton, improved strength properties of rolled metal maintaining high plastic characteristics.

A technology for slag formation in the ladle–furnace unit is considered; the slag is based on the CaO–SiO2–MgO–Al2O3–B2O3 system. This technology permits both microalloying of the steel with boron (reduced from the oxide phase) and desulfurization of the steel. The resulting boron content in the steel is 0.001–0.008%; the sulfur content in low-alloy steel and pipe steel is low (0.004–0.010%); and the consumption of manganese ferroalloys is reduced to 0.5 kg/t for 08кп steel and 1.4 kg/t for 09Г2C steel. In addition, the proposed technology increases the strength of the rolled steel, without loss in its plasticity; and reduces the environmental impact thanks to the replacement of fluorspar by colemanite.

Processes are considered for conversion of high-phosphorus cast iron during steel smelting in 300-ton oxygen converters of AO Arselormittal Temirtau beneath magnesia slags of sensible composition. Technology is developed and assimilated, including application towards the end of blowing with oxygen of saturated magnesia slag (8 − 11% MgO) with basicity 3.0 − 3.4 and formation of a wear-resistant skull coating (with resistance of 1–2 melts) on the lining during slag blowing with high-pressure nitrogen with additions of magnesia alumina flux (MAF). Use of MAF flux provides an increase in slag MgO content (up to 9 − 10%) with maintenance of required metal dephosphorizing within the limits 97.1 − 98.1% with a phosphorus content in metal on average of 0.013 − 0.017%.