THE USE OF ALUMINUM SLAG RECYCLING PRODUCTS IN INVESTMENT CASTING TECHNOLOGIES

K. Nikitin, A. V. Sokolov, V. I. Nikitin, N. V. D’yachkov
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Abstract

The studies of fractional, chemical and phase compositions of aluminum-containing slags of different origin found that slags are multi-component systems consisting of metal and non-metal parts. The non-metal part contains water-soluble and water-insoluble components. A practical scheme for recycling aluminum-containing slags was proposed in order to isolate the water-insoluble component to be further used a secondary refractory dusting material. It was found that the secondary refractory dusting material has a positive effect on the quality of refractory ceramic molds in investment casting and the surface finish of experimental aluminum castings. This material improves the strength of refractory ceramic molds by 9 times in comparison with silica sand molds and increases gas permeability by 15 % to 33 % in comparison with fused alumina and silica sand molds, respectively. The study covers the processes used to produce refractory ceramic molds based on the secondary refractory dusting material. The mechanism of interaction between dusting material particles and suspension is theoretically justified in terms of colloid chemistry. Negatively charged aluminum hydroxide micelles appear when ceramic mold layers are formed using the secondary refractory dusting material. Interaction between differently charged Al(OH)3 and SiO2 micelles makes secondary refractory dusting material particles come in close contact with each other. The theoretically justified processes of ceramic mold layer formation with the secondary refractory dusting material make it possible to explain the reduction in the surface roughness of castings made of AK9ch aluminum casting alloy using investment casting by 3.7 times compared with standard production processes.
铝渣回收产品在熔模铸造技术中的应用
通过对不同产地含铝炉渣的分数、化学组成和物相组成的研究,发现炉渣是由金属和非金属组成的多组分体系。非金属部分包含水溶性和不水溶性成分。提出了一种实用的含铝渣回收方案,以分离含铝渣中的水不溶性成分,进一步用作二次耐火除尘材料。研究发现,二次耐火粉尘材料对熔模铸造中耐火陶瓷模具的质量和实验铝铸件的表面光洁度都有积极的影响。与硅砂模相比,这种材料将耐火陶瓷模的强度提高了9倍,与熔融氧化铝和硅砂模相比,其透气性分别提高了15%至33%。研究了基于二次耐火粉尘材料的耐火陶瓷模具的生产工艺。从胶体化学的角度,理论上证明了粉尘颗粒与悬浮液相互作用的机理。当使用二次耐火粉尘材料形成陶瓷模层时,会出现带负电荷的氢氧化铝胶束。不同电荷的Al(OH)3与SiO2胶束之间的相互作用使得二次耐火粉尘颗粒之间的接触更加紧密。利用二次耐火粉尘材料形成陶瓷模层的理论证明,可以解释AK9ch铝合金精铸件表面粗糙度比标准生产工艺降低3.7倍的原因。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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