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首页> 外文期刊>Kemija u industriji >Preparation of Lime by Roasting the Limestone Deposits of Strezovci (Republic of Kosovo) and Its Use for the Aluminothermic Production of Calcium Metal
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Preparation of Lime by Roasting the Limestone Deposits of Strezovci (Republic of Kosovo) and Its Use for the Aluminothermic Production of Calcium Metal

机译：焙烧Strezovci（科索沃共和国）的石灰石沉积物制备​​石灰及其在铝热法生产钙金属中的用途

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The goal of producing and processing limestone ore (mostly CaCO3) is to obtain high-qualityrefractory materials based on lime (CaO). Lime is the raw material for obtaining calcium metalas a strategic and fundamental component in lead metallurgy (production of refined lead, Pb-Caalloys in the battery and cable industry, ferroalloys production with the addition of silicon andcalcium, production of alloy steel and high-quality steel).This paper explores the preparation of lime by roasting the limestone deposits of Strezovci(Republic of Kosovo) and its use for obtaining calcium through the aluminothermic process.Through research and analysis of the chemical composition of certain types of lime, its suitabilityfor obtaining calcium metal was determined, and by analyzing the samples of the slag,determined was the possibility of its use in the production of fire-resistant cement for which theevaluation is needed.Based on previous research, the following was chosen: optimal composition of the cast, volumeof added reducing agents, and conditions of the reduction process performance: temperature--time and initial vacuum.According to the authors’ knowledge, not one Southeast European country has applied thismethod, and it includes the use of by-products (slag), which can cause environmental pollution.The goal of this research was to prepare lime by roasting limestone of domestic origin in orderto obtain calcium metal through the aluminothermic process. The procedure of calcium metalproduction includes the following operations: decarbonatization of limestone ore (CaCO3),grinding of the obtained lime (CaO), homogenization of CaO and alumina, agglomeration, andaluminothermic reduction in vacuum furnaces. For the efficiency of the process, the mostimportant technological operations are decarbonatization and reduction, provided the otheroperations are performed correctly.The estimated total world capacity for production of calcium metal is 25 000 – 27 000tons/year. The mass fraction of calcium in manufactured calcium metal is minimum 97 %. Inrecent years, some western countries are producing calcium metal with 99.99 % of Ca, throughredistillation and zonal refining. In the countries of Southeastern Europe and former Yugoslavia,the largest consumers were lead metallurgy, battery and cable industries, the steel industry andthe producers of friction alloys.Based on the given results, the manufactured calcium metal can also be placed on other worldmarkets. These studies have shown that the preparation of lime by roasting the limestone depositsof Strezovce (Republic of Kosovo) and its use for the aluminothermic obtaining of calciummetal is possible. This would stop imports and initiate exports, as well as create conditions forserious research into the application of calcium metal for industrial purposes, and thus keeppace with global technological development trends.
机译：生产和加工石灰石矿石（主要是CaCO3）的目的是获得基于石灰（CaO）的高质量耐火材料。石灰是获得金属钙的原料，金属钙是铅冶金中的战略和基本成分（精炼铅的生产，电池和电缆行业中的Pb钙合金，含硅和钙的铁合金生产，合金钢的生产和高质量的生产）本文探讨了通过焙烧Strezovci（科索沃共和国）的石灰岩沉积物来制备石灰的方法，以及通过铝热法获得钙的用途。通过对某些类型石灰的化学组成进行研究和分析，其适用于获得确定了钙金属，并通过分析炉渣样品，确定了其可用于需要评估的耐火水泥生产中的可能性。基于先前的研究，选择了以下内容：铸件的最佳组成，添加还原剂的量以及还原工艺性能的条件：温度-时间和初始真空度。根据作者的知识，没有一个东南欧国家采用此方法，包括使用可能造成环境污染的副产品（矿渣）。本研究的目的是通过焙烧国内石灰石制备石灰为了通过铝热过程获得金属钙。钙金属的生产过程包括以下操作：石灰石矿（CaCO3）的脱碳，所得石灰（CaO）的研磨，CaO和氧化铝的均质化，结块以及在真空炉中进行铝热还原。为了提高工艺效率，最重要的技术操作是脱碳和还原，前提是必须正确执行其他操作。估计世界范围内的金属钙生产总能力为25 000 – 27 000吨/年。制成的钙金属中钙的质量分数最低为97％。最近几年，一些西方国家通过重蒸馏和区域精炼生产含钙99.99％的金属钙。在东南欧和前南斯拉夫的国家，最大的消费者是铅冶金，电池和电缆行业，钢铁行业以及摩擦合金的生产商。根据给定的结果，制成的钙金属也可以投放到其他世界市场。这些研究表明，通过焙烧Strezovce（科索沃共和国）的石灰石沉积物来制备石灰，以及将其用于铝热法获得金属钙的可能性。这将停止进口并启动出口，并为认真研究将钙金属用于工业用途创造条件，从而与全球技术发展趋势保持同步。

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