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importance of slag formation removal in blast furnace

Slag and its Role in Blast Furnace Ironmaking

Blast furnace slag composition has very important bearing on its physicochemical characteristics which affects the degree of desulphurisation, smoothness of operation, slag handling, coke consumption, gas permeability, heat transfer, hot metal productivity and its quality etc.

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Blast Furnace Slag an overview ScienceDirect

Blast furnace slag is a calcium-silicate-based product removed from the top of molten iron during its extraction from ore in a blast furnace. Usually, it is rapidly cooled to a glassy state and ground for use in construction materials (Provis et al., 2015 ).

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Blast Furnace Control using Slag Viscosities and Liquidus

Abstract The viscosity of molten slag in blast furnace operations is an important process variable, influencing the rate and location of reactions inside the furnace, as well as the ease with which the final slag could be removed from the furnace.

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GCSE CHEMISTRY Extraction of Iron in the Blast

Silicon dioxide is solid at the furnace temperature and the furnace would become blocked if it was not removed. Silicon dioxide reacts with calcium oxide to form calcium silicate (called slag) which is liquid in the furnace. Slag flows to the bottom of the furnace where it floats on

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Effect of High Al2O3 Slag on the Blast Furnace Operations

lower part of the blast furnace. So, it will be important to keep good slag fluidity at the blast furnace opera-tions such as, drainage of tapping and keeping good permeability. In order to clarify the effect of high Al 2O 3 slag fluidity on the blast furnace, high Al 2O 3 slag (20%) test op-erations of experimental blast furnace have been

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Phosphate Removal Using Blast Furnace Slags and Opoka

The finding that direct hydroxyapatite formation is the predominant P removal mechanism might have important implications for their possible use as fertiliser due to the poor solubility of hydroxyapatite. # 1999 Elsevier Science Ltd. All rights reserved Key words—blast furnace slag, fertiliser, hydroxyapatite, opoka, P removal mechanisms INTRODUCTION

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Analysis of Slag Flow in Blast Furnace during the

Such a slag acquires liquid mobility and trickles down the furnace away from the site where it starts distorting plastically, as soon as possible. This action exposes fresh sites for further reaction and is supposedly responsible for enhanced slag-metal reaction rates, influencing the blast furnace operations and the quality of the metal.

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The Use of Coated Pellets in Optimising the Blast Furnace

alkali removal from the furnace. By coating pellets with a suitable slag former additive, especially acid coating mater-ial, possibly more alkali can be retained in the slag phase due to an increased alkali pick up by the coating material. A higher output of alkali in the blast furnace slag will re-

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Formation of Scaffold in Blast Furnace Shaft

The term scaffold is used when there is accretion or scab formation on the blast furnace (BF) wall which causes a decrease in the cross sectional area of the shaft of the BF. Scaffold can occur relatively at the higher level of the BF shaft or relatively low in the BF shaft (near the top of the bosh).

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What are the Advantages and Disadvantages of

1. Blast furnace ironmaking is inseparable from the coke source, but the coke resources are getting less and less, but the price is getting higher and higher, the cost of iron making will be higher and higher, and it is likely that one day will meet the depletion of coke resources. 2. The blast furnace ironmaking damages the environment very much.

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Blast Furnace Slag an overview ScienceDirect

Blast furnace slag is a calcium-silicate-based product removed from the top of molten iron during its extraction from ore in a blast furnace. Usually, it is rapidly cooled to a glassy state and ground for use in construction materials (Provis et al., 2015).

More

Industrial uses of slag—The use and re-use of iron and

seriously effects furnace stability and as blast furnace operators will usually give priority to furnace stability over and above other operating variables, the slag composition is usually designed to ensure effective alkali removal. Most effective for alkali removal is an acidic slag but, unfortunately, low basicity slag is exactly the opposite of what is required to ensure effective sulphur removal.

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The Use of Coated Pellets in Optimising the Blast Furnace

alkali removal from the furnace. By coating pellets with a suitable slag former additive, especially acid coating mater-ial, possibly more alkali can be retained in the slag phase due to an increased alkali pick up by the coating material. A higher output of alkali in the blast furnace slag will re-

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Optimisation of the blast furnace burden based

Therefore, the efficient utilisation of poor quality iron ore resources is of great importance for the sustainable development of ironmaking industry. In this work, a new method for optimisation of blast furnace burdens was studied based on the primary slag formation behaviour because it has significant influence on the formation of the cohesive zone.

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Sulphur removal in ironmaking and oxygen steelmaking

the blast furnace (BF), during hot metal (HM) pretreatment, in the converter and during the secondary metallurgy (SM) treatment. For sulphur removal a low oxygen activity and a basic slag are required. In the BF typically 90% of the sulphur is removed; still,the HM contains about 0.03% of sulphur. Different HM desulphurisation processes are used worldwide.

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ALKALINE CARBONATES IN BLAST FURNACE PROCESS

tasks of blast furnace slag is removing harmful ele-ments. The total alkali content in the output raw materi-als is naturally reduced due to settling of these elements in the blast furnace lining. It takes place mainly in the upper parts of blast furnace, where the hot gases are cooling. Table 1 Measured alkali contents in input raw materials

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Slag Wikipedia

Slag is drawn off the furnace just before the molten steel is poured into ladles for ingotting. Ferrous and non-ferrous smelting processes produce different slags. The smelting of copper, lead and bauxite in non-ferrous smelting, for instance, is designed to remove the iron and silica that often occurs with those ores, and separates them as iron-silicate-based slags.

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Controlling Temperature and Chemistry within

The majority of the silicon added into the blast furnace is removed as slag, and only a small portion is found in the hot metal. Higher silicon content in the hot metal requires more energy generation in

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The following reactions take place in the blast

The following reactions take place in the blast furnace in the preparation of impure iron.Identify the reaction pertaining to the formation of the slag. 12th. Chemistry. General Principles and Processes of Isolation of Elements. Thermodynamic Principles of Metallurgy.

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What is the equation for the formation of slag?

Metals are extracted from their ores which contain several impurities, the lighter impurities are removed by slag formation. what is the density of liquid blast furnace slag.

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importance of slag formation removal in blast

HO blast furnace EBSCO Online Library Search Engine Directory Find Articles, Focuses on the importance of delayed ettringite formation (DEF) for the durability of concrete Mechanism of DEF; Ability of small-to-moderate additions of ground granulated blast furnace slag; Reduction of DEF expansion Retrofit system improves throughput .

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Sulphur removal in ironmaking and oxygen steelmaking

Sulphur removal in ironmaking and oxygen the blast furnace (BF), during hot metal (HM) pretreatment, in the converter and during the secondary metallurgy (SM) treatment. For sulphur removal a low oxygen activity and a basic slag are required. In the BF typically 90% of the sulphur is removed; still,the HM contains

More

ALKALINE CARBONATES IN BLAST FURNACE PROCESS

tasks of blast furnace slag is removing harmful ele-ments. The total alkali content in the output raw materi-als is naturally reduced due to settling of these elements in the blast furnace lining. It takes place mainly in the upper parts of blast furnace, where the hot gases are cooling. Table 1 Measured alkali contents in input raw materials

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Slag-Iron and Steel 2017 (2) IBM

Steel slag can also replace granulated blast furnace slag up to 10% in the manufacture of Portland Slag Cement. Steel slags are produced at steel melting shop during steel manufacturing. To produce steel, removal of excess silicon and carbon from iron is achieved through oxidation by adding limestone and coke. The steel slag contains

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Controlling Temperature and Chemistry within

Silicon content in blast furnace hot metal comes from both the metallurgical coke and the iron ore pellets that are added to the blast furnace as charge material. The majority of the silicon added into the blast furnace is removed as slag, and only a small portion is found in the hot metal.

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Industrial uses of slag (the use and re-use of iron

18-07-2013 During ironmaking as well as during steelmaking, significant amounts of slag are produced. Two decades ago, more than 13 million tonne (mt) of blast furnace slag and 4 mt of steelmaking slag per annum were produced in the USA alone. It is therefore not surprising that many attempts have been made to re-use iron and steelmaking slags.

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PREPARATION OF SORBENT WITH A HIGH ACTIVE SORPTION

be blast furnace slag (BFS) which can be used for adsorptive removal of soluble phos-phates from wastewater. Increased content of phosphate is a reason for eutrophication of surface water. BFS is a complex system of stable composition made of major components such as CaO–MgO–Al. 2. O. 3 –SiO. 2. and some of minor importance. It was found that it character-

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METALLURGICAL USES FLUXES FOR METALLURGY

The function of the slag might vary at different stages within a process prior to final melting. For example, the slag composition and behavior will change as materials descend in the iron blast furnace, or as they melt in the early stages of formation of steel- making slags. Selection of the chemistry for a slag

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in Steel Slag Filters Used for Phosphorus Removal

In AGFs, P removal occurs by precipitation of phosphate minerals associated with a pH rise (reaching as high as pH 13) induced by reactive media dissolution. Examples of AGF media include industrial by-products (fly ash, electric arc furnace slag, basic oxygen furnace slag, blast furnace slag), natural media (bauxite, calcite, seashells, apatite),

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gcse 2. Blast furnace extraction of iron recycling,

Iron from the blast furnace contains about ~96% iron with ~4% of impurities including carbon, silica and phosphorus. In this state the cast iron is too hard and too brittle for most purposes. Cast iron is hard and can be used directly for some purposes eg manhole covers, ornamental railings because of its strength in compression and is very hard wearing.

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