Industrial application of blast furnace slag as a substitute for sand at the cement plant of Hadjar-Soud (Algeria)

Abstract

ПроМислове ЗАстосувАння доМенного ШлАку в якості ЗАМінникА Піску нА цеМентноМу ЗАводі ХАджАр-сууд (Алжир) purpose. This study is conducted on the use of industrial waste (blast furnace slag) from the El-Hadjar steel plant located in eastern Algeria. The research aims to understand the behaviour of the addition of Slag as raw material (replacing sand) in the preparation of the mixture before baking in the rotary kiln at the Hadjar-Soud cement plant in Skikda. Methodology. The representative samples taken from the cement plant site are subjected to grinding of the mixture of limestone, slag, clay and iron ore, the material prepared at a grain size of less than 50 μ is subjected to a physicochemical characterization. The prepared sample is placed in a furnace with a temperature of up to 1450 °C. findings. The results obtained during the tests show that the addition of slag into the raw meal does not affect the chemical or mineralogical composition of the clinker. However, the clinker obtained reveals significant results and meets the Algerian standard NA 442 2000 (CPJ CEM II/A 42.5). The addition of slag to replace the sand has allowed us to reduce the annual CO 2 emission rate by about 17.5 %, and contributes to the reduction of pollution. originality. The originality of this work is the preparation of the raw cement meal, based on slag (already decarbonated material) instead of sand. As a rule, for the production of cement clinker, the proportion of the raw materials is: limestone (77-80 %), clay (16-18 %), iron ore (1.5-3 %) and sand (2-4 %). In the present work, the proportions for the production test of the slag-based clinker are respectively: limestone 70 %, slag 9 %, clay 19.2 % and iron ore 1.8 %. The estimate of the annual CO 2 emission rate in the cement plant was carried out by the Software (GEMIS 4.7). practical value. The process for obtaining slag-based clinker (steel waste) is probably of great importance for the production of cement for several reasons: the production of one tonne of Clinker at a minimum cost, along with management of non-renewable natural raw materials, such as sand and limestone deposits, and work towards sustainable development.

Cement Kiln Dust in CIMENCAM Figuil (North Cameroon): characteristics and recycling as additives for blended cement production

“…If this value is too high, the raw materials would not be well cooked and this would therefore increase the proportion of free lime. The value 97.9 for the analyzed clinker is within the range limit de ned by Mekti et al [40] which makes this clinker good for cement production. The low SO 3 (from the used biomass as combustible) (0.83%), alkaline (Na 2 O : 0.23%, K2O : 1.06%) and metallic oxide (Ti 2 O : 0.23%, MgO : 2.71%) contents are due to the low proportion of clays used during clinkerization (at 950-1400 o C) and decarbonatation of used carbonate rocks.…”

“…The required range limit values for LSF de ned by Mekti et al [40] are 90 ≤ LSF ≤ 100. If this value is too high, the raw materials would not be well cooked and this would therefore increase the proportion of free lime.…”

Assessment of the State of the Terrestrial Environment in Skikda Region (Algeria) Using Enzymatic Activity and Energy Reserve Contents of Land Snails, Cantareus Aspersus

“…Furthermore, the site of Ben-Azouz is located near the cement factory of Hadjar-Soud, generating contamination by the cement dust. Cement dust of Hadjar-Soud constitutes numerous types of metal oxides including calcium oxide (CaO), silicon oxide SiO2, aluminum trioxide Al2O3, ferric oxide Fe2O3, and other components (Mekti, 2018). In accordance with this result, the decrease in AChE activity was reported in the head of Cantareus aspersus collected from the same north-east Algerian sites compared to snails of the reference site (El Kala).…”

Marbles and schists from Bidzar (North Region of Cameroon) : characteristics and the use of schists as additives in blended cement production

“…The major element oxide composition and LOI for three types of studied schists (bluish-green schist, dark-grey schist, and sericite schist) are presented in are respectively close the standard value (Na 2 O+K 2 O: 1.20 wt.%) [2], and within the range limit (0.9 ≤ LSF≤1.0) for well-cooked clinker de ned by Mekti et al [39]. The characteristics of the used clinker presented above, are similar those of well-cooked clinker, and make it suitable to be used for cement production.…”