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Process for production of aluminum and alkaline earth metal by carbothermic production of alkaline earth metal aluminide and reduction of aluminum and alkaline earth metal in electrolytic reduction cell

机译：通过碳热法生产碱土金属铝化物并在电解还原池中还原铝和碱土金属来生产铝和碱土金属的方法

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摘要

An improved process is disclosed for carbothermically producing an alkaline earth metal aluminide from an aluminum-bearing material which, in one aspect comprises forming a mixture of a carbonaceous reducing agent and a slag comprising the aluminum-bearing material, the alkaline earth metal compound, forming, at a first temperature, an alloy containing impurities in the slag; removing the alloy containing the impurities from the slag; and then heating the slag to a higher temperature to form the alkaline earth metal aluminide. The alkaline earth metal compound used in the process may comprise calcium carbide. Alternatively, both the alkaline earth metal compound and the aluminum- bearing material may be obtained using a calcium aluminate slag such as a byproduct from the steel industry. The calcium aluminate slag is purified in a preliminary step to remove silicon by alloying it with iron and then removing a ferrosilicon alloy formed in this step. Byproducts formed during the reactions may be recycled back if desired. PP Either metallic aluminum, the alkaline earth metal, or both may be recovered from the aluminide material using, respectively a halide, a sulfurous, or a nitrogen stripping agent, or by reducing both metals in an electrolytic reduction cell. The alkaline earth metal aluminide may also be used as a reducing agent to recover other metals such as magnesium oxide by reduction from their respective compounds.

机译：公开了一种用于从含铝材料碳热生产碱土金属铝化物的改进方法，该方法在一方面包括形成含碳还原剂和包含铝土材料，碱土金属化合物的炉渣的混合物，在第一温度下，炉渣中含有杂质的合金;从炉渣中除去含有杂质的合金;然后将炉渣加热到更高的温度以形成碱土金属铝化物。在该方法中使用的碱土金属化合物可以包含碳化钙。可替代地，可以使用铝酸钙矿渣例如来自钢铁工业的副产物来获得碱土金属化合物和含铝材料。在预备步骤中纯化铝酸钙炉渣，以通过与铁形成合金来除去硅，然后除去在该步骤中形成的硅铁合金。如果需要，可以将反应过程中形成的副产物再循环回去。

可以分别使用卤化物，硫磺或氮汽提剂，或通过在电解还原池中还原两种金属，从铝化物材料中回收金属铝，碱土金属或两者。碱土金属铝化物也可以用作还原剂，以通过从它们各自的化合物中还原来回收其他金属，例如氧化镁。展开▼

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公开/公告号US4724054A

专利类型
公开/公告日1988-02-09

原文格式PDF
申请/专利权人 ALUMINUM COMPANY OF AMERICA;
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申请/专利号US19860946005
发明设计人 MELVIN H. BROWN;C. NORMAN COCHRAN;
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申请日1986-12-24
分类号C25C3/06;
国家 US
入库时间 2022-08-22 06:49:32

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