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Effects of calcium hydroxide and calcium chloride addition to bentonite in iron ore pelletization

机译：膨润土中氢氧化钙和氯化钙对铁矿石造粒的影响

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摘要

Pyrite ash is created as waste from the roasting of pyrite ores during the production of sulphuric acid. These processes generate great amounts of pyrite ash waste that is generally land filled. This creates serious environmental pollution due to the release of acids and toxic substances. Pyrite ash waste can be utilized in the iron production industry as a blast furnace feed to process this waste and prevent environmental pollution. The essential parameters affecting the pelletization process of pyrite ash were studied using bentonite as a binder. Experiments were then carried out using bentonite and a mixture of bentonite with calcium hydroxide and calcium chloride in order to make the bentonite more effective. The metallurgical properties of pyrite ash, bentonite, calcium hydroxide, calcium chloride, a mixture of these and sintered pellets were studied using X-ray analysis. The crushing strength tests were carried out to investigate the strength of pyrite ash waste pellets. The results of these analyses showed that pyrite ash can be agglomerated to pellets and used in the iron production industry as a blast furnace feed. The crushing strength of the pellets containing calcium hydroxide and calcium chloride in addition to bentonite was better than the strength of pellets prepared using only bentonite binder.
机译：硫铁矿灰是在硫酸生产过程中焙烧黄铁矿矿石时产生的废物。这些过程会产生大量的黄铁矿灰渣，这些废物通常被填埋。由于释放酸和有毒物质，这会造成严重的环境污染。硫铁矿灰渣可作为炼铁厂原料用于炼铁行业，以处理这种废物并防止环境污染。以膨润土为粘结剂，研究了影响黄铁矿灰分制粒过程的基本参数。然后使用膨润土以及膨润土与氢氧化钙和氯化钙的混合物进行实验，以使膨润土更有效。使用X射线分析研究了黄铁矿灰，膨润土，氢氧化钙，氯化钙，它们的混合物以及烧结球团的冶金性能。进行破碎强度测试以研究黄铁矿灰废料粒料的强度。这些分析的结果表明，黄铁矿灰可以聚集成球团，并在炼铁行业用作高炉原料。除膨润土外还含有氢氧化钙和氯化钙的颗粒的抗压强度比仅使用膨润土粘合剂制备的颗粒的抗压强度要好。

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