Expanded microspheres and preparation method thereof: Fid-Bau Portal

Expanded microspheres and preparation method thereof

WANG YAOWEI / XIAO DECAI / NIU HANXIN / CHENG QI / WANG FEI

The invention discloses expanded microspheres and a preparation method thereof, and belongs to the field of thermal insulation materials, the expanded microspheres are prepared from the following rawmaterials by weight: 50-59% of tailings, 6-10% of sodium sulfate powder, 13-15% of glass powder, 5-9% of calcium carbonate powder, 5-8% of sodium phosphate powder, 2-4% of borax, 0.5-2% of graphite and 0.3-2% of silicon carbide micropowder, and the raw materials are uniformly mixed to obtain a mixture; granulating: adding sodium silicate accounting for 5% of the total mass of the mixture into themixture prepared in the step S1 to be mixed and granulated, and obtaining particles with the diameter ranging from 0.3 mm to 2 mm; drying: feeding the particles prepared in the step S2 into a drying kiln to be dried, removing moisture in the particles, and it is guaranteed that the moisture in the particles is controlled to be 2% or below; and roasting: putting the particles obtained in the step S3 into a rotary puffing kiln to be fired, and preparing the puffed microbeads. The prepared puffed microbeads have the characteristics of being low in density, low in heat conductivity coefficient, non-combustible, high in cylinder pressure strength and wide in application range, and have extremely wide market prospects.

本发明公开了一种膨化微珠及其制备方法，属于保温隔热材料领域，包括下列原料按照下列重量百分比制成：尾矿50～59％、硫酸钠粉6～10％、玻璃粉13～15％、碳酸钙粉5～9％、磷酸钠粉5～8％、硼砂2～4％、石墨0.5～2％和碳化硅微粉0.3～2％，将原料混合均匀得混合料；造粒：将步骤S1制备的混合料加入混合料总质量5％的水玻璃进行混合造粒，得到直径为0.3～2mm的颗粒；干燥：将步骤S2中制得的颗粒送入烘干窑中进行烘干，去除颗粒中的水分，保证颗粒中的水分控制在2％以下；烧制：将步骤S3所得的颗粒投入回转膨化窑中进行烧制，即可制得膨化微珠，制备的膨化微珠具有密度轻、导热系数低、不燃烧、筒压强度高、用途广泛的特点，具有极为广阔的市场前景。

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