Study of removal Chrome (III) using Calcium Silicate Hydrate (CSH) synthesized from rice hush and CaO by hydrothermal method

The Calcium Silicate Hydrate (CSH) family mineral such as Xonotlite (X), Tobermorite (T) was synthesized by hydrothermal method using rice hush and CaO as the Si and Ca supplier. The rice hush (RH) was burnt inside the furnace at 500oC for 2hrs to obtain the rice hush ash (RHA), then mixing with CaO with the Ca/Si 1.0, and hydrothermal treatment at 110oC for 24h to obtain Xonotlite and Tobermorite mineral with micropore structure (coded as CSH-110/24). The CSH 110/24 samples were used to remove Chrome (III) in 2,4 and 6 hours, with fast removal phenomena. This research can be applied in metallurgy industry such as removal Chrome (III) during the Chrome-coating process.

Human reliability analysis of high-temperature molten metal operation based on fuzzy CREAM and Bayesian network

Human errors are considered to be the main causation factors of high-temperature molten metal accidents in metallurgical enterprises. The complex working environment of high- temperature molten metal in metallurgical enterprises has an important influence on the reliability of human behavior. A review of current human reliability techniques confirms that there is a lack of quantitative analysis of human errors in high-temperature molten metal operating environments. In this paper, a model was proposed to support the human reliability analysis of high-temperature molten metal operation in the metallurgy industry based on cognitive reliability and error analysis method (CREAM), fuzzy logic theory, and Bayesian network (BN). The comprehensive rules of common performance conditions in conventional CREAM approach were provided to evaluate various conditions for high-temperature molten metal operation in the metallurgy industry. This study adopted fuzzy CREAM to consider the uncertainties and used the BN to determine the control mode and calculate human error probability (HEP). The HEP for workers involved in high-temperature melting in steelmaking production process was calculated in a case with 13 operators being engaged in different high-temperature molten metal operations. The human error probability of two operators with different control modes was compared with the calculation result of basic CREAM, and the result showed that the method proposed in this paper is validated. This paper quantified point values of human error probability in high-temperature molten metal operation for the first time, which can be used as input in the risk evaluation of metallurgical industry.

Stan górnictwa i hutnictwa w kluczu samsonowskim w świetle lustracji z 1809 roku

The State of Mining and Metallurgy in the Samsonów Complex in the Light of the Survey from 1809 The article presents the Survey of the Samsonów complex from 1809, with a historical commentary. The document contains information on the condition of the mining and metallurgy industry, with particular emphasis on blast furnaces in Samsonów and Szałas, fryers, ore supply, organisation of miners’ work, supply of wood for charring, and organisation of charcoal production.

INNOVATION CLUSTER AS AN IMPORTANT FACTOR OF THE DEVELOPMENT OF THE METALLURGY INDUSTRY OF TASHKENT REGION

Authors reveal the meaning of the cluster as a tool in the development of industry of regions. The main ideas of M. Porter on the prerequisites for the development and structure of the cluster are characterized. The main types of the cluster are identified based on its features. The potential of the metallurgical industry of Tashkent region and its prospects for the development in the framework of the innovation cluster “Steel Progress” are described and analyzed

Efficient NO2 sensing performance of a low-cost nanostructured sensor derived from molybdenite concentrate

Molybdenite concentrate from the mining-metallurgy industry is characterized as a valuable material for the fabrication of an efficient and low-cost nanostructured gas sensor.

NIOBIUM ALLOY STEEL APPLIED IN COLD FORMING MANUFACTURE

Niobium alloy steels are still little known and debated when applied to the metallurgy industry, including cold forming process. It is not much clear about its characteristics and your mechanical performance when compared to traditional steels, which the market already uses. The possibility of input new materials, reducing costs and generating competitiveness is the basis for researches that can generate new opportunities for industries. In this article, we showed the possibility of withdrawing the heat treatment process, which guided the execution of the tests presented here. This paper deals with the performance comparison of SAE 1312 MOD steel compared to ISO 898-1, which deals with mechanical performance for bolts. The tests were correlated with the bolts of 8.8 resistance class, which currently have heat treatment. It is possible to evaluate the positive performance of the niobium-alloyed steel (SAE 1312 MOD), despite the occasional performance limitations in some attributes addressed in ISO 898-1.