JNARDDC is intensely working toward the development of boehmite product hydrate as an intermediate product to reduce energy consumption in the calcination step. The innovative process of modifying the gibbsite seed property to boehmite and using it in precipitation has been thoroughly explored in the study. The investigations have shown that it can be produced in the precipitation circuit using boehmite seed hydrate under conditions different than that of gibbsite precipitation. Statistical design of experiments was applied, and liquor productivity achieved was 45–55 g/L at optimal parameters. Temperature and seed ratio are the most important facilitating factors for boehmite precipitation. Experimental results have confirmed that boehmite can be precipitated at 90–110 °C and with a caustic solution having a concentration of pregnant liquor of 145 g/L. Upon calcination at 600–700 °C, boehmite product hydrate generates alumina having properties very close to smelter-grade alumina. Characteristics of boehmite seed and product hydrate and alumina obtained by calcination of boehmite product hydrate have been explained in detail as well.

中文翻译：

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拜耳回路中勃姆石沉淀的创新工艺

JNARDDC致力于开发勃姆石产品水合物作为中间产品，以减少煅烧步骤中的能耗。在研究中已彻底探索了将三水铝石种子特性改性为勃姆石并将其用于降水的创新方法。研究表明，它可以在勃姆石晶种水合物中，在不同于三水铝石沉淀的条件下，用勃姆石种子水合物在沉淀回路中生产。应用统计实验设计，在最佳参数下，白酒生产率达到45–55 g / L。温度和晶种比是勃姆石沉淀的最重要的促进因素。实验结果证实，勃姆石可以在90-110°C的温度下用高浓度母液145 g / L的苛性溶液沉淀。在600–700°C下煅烧后，勃姆石产品水合物生成的氧化铝的性能非常接近冶炼级氧化铝。还详细解释了勃姆石晶种和产物水合物以及通过煅烧勃姆石产物水合物获得的氧化铝的特性。