scholarly journals Effect of Finely Ground Limestone and Dolomite on Compression Strength and Reduction Swelling of Vanadium-Titanium Pellets

Materials ◽  
2021 ◽  
Vol 14 (16) ◽  
pp. 4433
Author(s):  
Hao Liu ◽  
Shihong Peng ◽  
Ke Zhang ◽  
Yuelin Qin ◽  
Fei Meng ◽  
...  
Keyword(s):  
Compression Strength ◽  
Raw Material ◽  
Scarce Resources ◽  
Green Pellet ◽  
Metallurgical Properties ◽  
Cold Compression ◽  
Reduction Swelling ◽  
Vanadium Titanium ◽  
Reduction Index ◽  
Ground Limestone

Vanadium−titanium magnetite (VTM) is an important raw material for ironmaking under the situation of increasingly demanding scarce resources. To further improve the metallurgical properties of pellets, and to satisfy the requirements of blast furnace slag basicity, finely ground dolomite and limestone have been added to the pellet. In this study, the effect of finely ground dolomite and limestone on the metallurgical properties (green pellet drop strength, cold compression strength, reduction swelling index, and microscopic mineral structure) of VTM pellets were investigated. With the addition of finely ground dolomite and limestone, the drop strength of the green pellet was improved. The effect of adding finely ground limestone was greater than adding finely ground dolomite. Adding more finely ground dolomite and limestone compared to pellets without limestone and dolomite, the cold compression strength was decreased, which was attributed to the decomposition of limestone and dolomite during the induration of pellets. With the addition of dolomite, the reduction swelling index (RSI) increased firstly and then decreased. When the basicity of the pellet was 0.54 to 0.94, the slag phase with the lowest melting point was formed, corresponding to the maximum of the reduction swelling index. For the pellets with added limestone, the reduction swelling of the pellets deteriorated. The reduction index of the pellets increased and reached the maximum (26.6%) at a basicity of 1.54, which belongs to abnormal swelling.

Effect of MgO addition on the metallurgical properties of the vanadium-titanium pellet with simulating blast furnace conditions

2018 ◽  
Vol 47 (4) ◽  
pp. 388-397 ◽  
Author(s):  
Wei Zhao ◽  
Mansheng Chu ◽  
Cong Feng ◽  
Hongtao Wang ◽  
Zhenggen Liu ◽  
...  
Keyword(s):  
Blast Furnace ◽  
Metallurgical Properties ◽  
Vanadium Titanium

Research on Influencing Factors of Wood Residual Fiber Foaming Cushion Material

2012 ◽  
Vol 511 ◽  
pp. 46-50
Author(s):  
Bin Cao ◽  
Sheng Ling Xiao ◽  
Xiao Qing Pan
Keyword(s):  
Mechanical Property ◽  
Surface Quality ◽  
Influencing Factors ◽  
Compression Strength ◽  
Wood Fiber ◽  
Compression Modulus ◽  
Hot Compression ◽  
Raw Material ◽  
Single Factor ◽  
Foaming Agent

A wood residual fiber foaming cushion material was prepared by using gathered wood fiber as main raw material, starch/PVA adhesive as matrix, adding a certain amount of foaming agent and related additives, hot compression molding to shape up. This paper makes an investigation of single factor on the product’s surface quality and related mechanical property. Results show that with the amount of wood residual fiber increases, the rebound resilience of the product first increases then decreases. The density decreases along with the amount of foaming agent increases. The compression strength and compression modulus of the product increases along with the amount of wood residual fiber increases, it decreases along with the amount of foaming agent increases.

Effects of B-Mg Additive on Metallurgical Properties of Oxidized Pellets

2011 ◽  
Vol 284-286 ◽  
pp. 1232-1236
Author(s):  
Zhao Cai Wang ◽  
Man Sheng Chu ◽  
Shi Qiang Chen ◽  
Zheng Gen Liu ◽  
Jue Tang ◽  
...  
Keyword(s):  
High Efficiency ◽  
Shaft Furnace ◽  
Direct Reduction ◽  
Strength Reduction ◽  
Metallurgical Properties ◽  
Remarkable Improvement ◽  
Oxidized Pellets ◽  
Reduction Swelling ◽  
Roasting Temperature ◽  
Addition Amount

The metallurgical properties of oxidized pellets are of great importance to achieve high efficiency and smooth running of blast furnace and gas-based direct reduction shaft furnace. In this study, the new method of adding B-Mg compound additive has been put forth to improve metallurgical properties of pellets. The effects of adding B-Mg additive on the strength of green balls, cold compressive strength, reduction swelling, and the strength after reduction and cooling of oxidized pellets are investigated through the experiments and microstructure analysis. The results revealed that, the B-Mg additive has not-so-remarkable effects on the properties of green balls. The rational addition amount of B-Mg additive is 0.6 %, and B-Mg additive make it feasible to reduce roasting temperature of the pellets. High temperature properties show remarkable improvement with the increase of B-Mg additive amount, the RSI decrease from 14.7% to 7.17%, and the strength of pellets after reduction and cooling increase from 162.5 N to 650.8 N when the addition amount increases from 0 to 0.6%.

scholarly journals Variation in strength owing to solidification treatment of weathered granite soil

2021 ◽  
Vol 21 (3) ◽  
pp. 163-169
Author(s):  
Sungyeol Lee ◽  
Sunggon Kim ◽  
Wonjin Baek ◽  
Sungjin Kwon ◽  
Changsung Jung ◽  
...  
Keyword(s):  
Compression Strength ◽  
Raw Material ◽  
Unconfined Compression Strength ◽  
Unconfined Compression ◽  
X Ray Diffraction ◽  
Curing Conditions ◽  
Weathered Granite ◽  
Soil Cement ◽  
Weathered Granite Soil ◽  
Granite Soil

Recently, soil-cement is being increasingly used in various applications such as road pavements, slope protection, backfilling of earth walls, and improving soft ground, in order to increase the strength of the raw material soil. Therefore, in this study, the characteristics of changes in the unconfined compression strength of soil-cement were analyzed by adding a solidifying agent targeting granite soil, which is representatively distributed in Korea. Laboratory tests were conducted to analyze the changes in strength according to 1) curing conditions and fine contents, 2) inorganic solidifying agent, and 3) repeated effects of dry and wet conditions. The unconfined compression strength of soil-cement increased as the curing period and mixing ratio increased, and it was constant after 14 days of curing. In addition, weathered granite soil with relatively low fine contents showed a large increase in the unconfined compression strength. In addition, the strength increased with an increase in the solidifying agent added. X-ray-diffraction analysis showed that vermiculite was generated by adding cement and admixtures, and the strength was increased by filling the gap between the particles. Considering the results of this study, a relationship between the unconfined compression strength and the elastic modulus of soil-cement by treatment with a solidifying agent was proposed.

The Study of the Magnetic Properties of Red Mud from Alumina Production after Alkaline Treatment

2021 ◽  
Vol 316 ◽  
pp. 673-677
Author(s):  
Irina V. Loginova ◽  
Aleksei V. Kyrchikov
Keyword(s):  
Magnetic Properties ◽  
Cast Iron ◽  
Red Mud ◽  
Iron Content ◽  
Alkaline Treatment ◽  
Raw Material ◽  
Magnetic Fraction ◽  
Alumina Production ◽  
Aluminum Compounds ◽  
Vanadium Titanium

In Russia, the main feedstock for producing aluminum is bauxite. During the processing of 1 ton of bauxite into alumina (Al2O3), up to 0.5–0.6 ton of techno-genic waste is formed, that is red mud. It is not currently disposed of and accumulated in mud tailing dumps. It contains valuable components: Al – 8 %; Fe – 25 %; Ti – 2.4 % and it can be considered as a potential raw material for ferrous metallurgy and as a source of vanadium, titanium, and rare-earth elements (REE) Sc, Y, La. The paper shows the possibility of obtaining red mud with an increased iron content of up to 36 %, with an additional extraction of aluminum. Red mud from the Ural Aluminum Plant (Russia) is considered. It is proposed to direct this mud to the production of pellets for the production of cast iron. To extract aluminum from red mud, it is proposed to process the mud in a highly alkaline medium by sintering in the temperature range 300–600 °C. The resulting sinter is leached with water or a slightly alkaline solution with the conversion of aluminum compounds into solution. The red mud, obtained this way, exhibits magnetic properties. A magnetic separation was carried out, and the yield of the magnetic fraction is 79.87 %. The iron content increases by 25 % and amounts to 51.88 % of Fe2O3.

scholarly journals Effects of Dolomite on Mineral Compositions and Metallurgical Properties of Chromium-Bearing Vanadium–Titanium Magnetite Sinter

Minerals ◽  
2017 ◽  
Vol 7 (11) ◽  
pp. 210 ◽  
Author(s):  
Songtao Yang ◽  
Weidong Tang ◽  
Mi Zhou ◽  
Tao Jiang ◽  
Xiangxin Xue ◽  
...  
Keyword(s):  
Metallurgical Properties ◽  
Mineral Compositions ◽  
Vanadium Titanium ◽  
Titanium Magnetite

scholarly journals Utilization of Kelut’s Volcanic Ash as the Aggregate Mixture of Concrete Brick

2016 ◽  
Vol 718 ◽  
pp. 196-200 ◽  
Author(s):  
Siti Salamah ◽  
Maryudi
Keyword(s):  
Compression Strength ◽  
Volcanic Ash ◽  
Mechanical Characteristics ◽  
Mesh Size ◽  
Raw Material ◽  
Maximum Compression ◽  
Hardening Process

Kelut volcano had erupted in February 2014. The eruption has produced various materials i.e. ash, sands, etc. Volcanic ash contains various elements such as Si, Al, Ca, Fe, Na and P. It is potential to be used as raw material for cement-based products. This study investigates the utilization of Kelut’s volcanic ash as the raw material of cement-brick. The Kelut’s volcanic ash was analyzed to determine the contents of iron (Fe), aluminum (Al), and silica (Si). The volcanic ash was screened to obtain 100 mesh size of ash. The volcanic ash of 100 mesh size was mixed with cement, sand, and water with ratio of 1 kg cement, 2 kg volcanic ash, and 15 kg sand (1 :2 :15). The mixture of volcanic ash, sand and cement was poured and pressed in the concrete brick mold. The concrete brick was then aerated in a room for hardening process. The experiment was repeated for another ratio of raw material (cement: volcanic ash: sand = 2:1:15) and the age of the concrete brick (46, 61, 75 and 89 days). Concrete bricks were analyzed to determine the quality and the mechanical characteristics. The results has shown that Kelut’s volcanic ash has a composition of aluminum (Al) 4.707%, silica (SiO2) 23.4%, and iron (Fe) 3.85%, that is like the composition of the cement materials. The concrete bricks which are made of cement, Kelut’s volcanic ash, and sand with the ratio of 2:1:15 has a maximum compression strength of 18.85 MPa at the age of 89 days. The addition of Kelut’s volcanic ash has improved the strength of concrete brick. However, too much volcanic ash will lead to increasing compression strength.

Experimental Study of Softening and Melting Properties on Indonesia Vanadium-Titanium Sinters

2011 ◽  
Vol 284-286 ◽  
pp. 1039-1043 ◽  
Author(s):  
Qiang Jian Gao ◽  
Guo Wei ◽  
Lin Mu ◽  
Gang Du ◽  
Feng Man Shen
Keyword(s):  
Blast Furnace ◽  
Molten Slag ◽  
Softening Temperature ◽  
Melting Zone ◽  
Raw Material ◽  
Blast Furnace Process ◽  
Furnace Process ◽  
Melting Properties ◽  
Vanadium Titanium ◽  
Titanium Magnetite

As a raw material, Indonesia vanadium-titanium sinters are being applied to the blast furnace process for iron making in the typical iron and steel plant. In order to keep the health running of blast furnace process, in this work we have investigated the softening and melting properties of Indonesia vanadium-titanium sinters. We found that the content of vanadium-titanium magnetite in sinter is correlated with the softening and melting ranges for those sinters considered here. With the increasing of the vanadium-titanium magnetite in sinter, the starting softening temperature increases gradually and the final softening temperature increases as well, thereby the softening range becomes narrow. Both starting and final melting temperatures begin to ascent, and the variation of melting range is not obvious. In addition, we also found that the coke is wetted by the molten slag and iron. From the viewpoint of blast furnace process, the softening and melting zone has to move downward. In this zone of blast furnace the contact area of solid-liquid phase will get larger because of the close contract among the molten slag, iron and coke. On one hand, this kind of behavior can definitely speed up the reduction of iron oxide. On the other hand, it simultaneously worse the ventilation properties and affect the normal running of air flow, because a lot of iron and slag can not be got smoothly into the hearth through coke layer.

Properties of Special Mortar Made with Raw Waste Material

2014 ◽  
Vol 680 ◽  
pp. 135-139
Author(s):  
Mohd Syahrul Hisyam Mohd Sani ◽  
Fadhluhartini Muftah ◽  
Muhammad Isha Ismail ◽  
Marzuki Ab. Rahman
Keyword(s):  
Compression Strength ◽  
Bottom Ash ◽  
Chemical Properties ◽  
Waste Material ◽  
Raw Material ◽  
Waste Paper ◽  
Recycling Industry ◽  
Power Stations ◽  
Material Sources ◽  
Sludge Ash

The paper deals with the properties of a special mortar using a Waste Paper Sludge Ash (WPSA) from Waste Paper Recycling Industry and Bottom Ash (BA) from Coal Electric Power Stations. Special mortar with some advantages is proposed to give a significant impact for replacing of normal cement mortar. The advantages are approached due to the problem that occurred from collecting raw material such as pollution problems and environmental impact issues. Besides, the raw material sources of cement and sand is limited and this issue engages with the ideas to produce new material in mortar and masonry engineering. A total 72 cubes mortar is cast and determined their properties of chemical and mechanical. The properties of special mortar are compared with other special mortar made of other waste material. The compression strength of special mortar is conducted at the age 3, 7, 28 and 40 days of curing. From the result of chemical properties, it showed that the special mortar created the high compression strength value for all mixes. The compression strength of special mortar is increased by increasing the percentage sand replacement by BA. But, the compression strength is decreased when WPSA is increased. Finally, the special mortar with 100 % BA and 10 % WPSA showed the appropriate proportion for producing special mortar.

Waste of Civil Construction for Use in Mortar and Production of Structural Concrete

2020 ◽  
Vol 1012 ◽  
pp. 215-220
Author(s):  
Jheison Lopes dos Santos ◽  
Niander Aguiar Cerqueira ◽  
Afonso Rangel Garcez de Azevedo ◽  
Alan Marinho Costa ◽  
M.T. Marvila ◽  
...  
Keyword(s):  
Compression Strength ◽  
Total Mass ◽  
Large City ◽  
Raw Material ◽  
Partial Replacement ◽  
Waste Generation ◽  
Structural Concrete ◽  
Construction Waste ◽  
Small Aggregate ◽  
Good Workability

Civil construction is a sector of extreme impact on the Brazilian economy, both in terms of jobs as well as consumption of raw material and waste generation. Civil construction waste (CCW) represents a large part of the total mass of municipal solid waste in a medium and large city. An alternative to diminish these released wastes is to reuse them. In this work, a study was carried out using CCW both to produce concrete with sand substitution and as a small aggregate for use in mortar. The compression strength of structural concrete and mortar, with total and partial replacement of sand, was analyzed. In addition, the consistency of mortar with the replacing was also studied. The results of the compression test indicate superior quality for concretes (75wt% CCW) and mortar with CCW incorporation. The required amount of water for good workability in the modified mortar is 310 g, against 270 g for the reference mortar.

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