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珍珠岩(或黑耀岩、松脂岩)经破碎、过筛,加工成粒径小于5毫米的颗粒,然后在立窑或回转窑中以300～400℃预热,并经800～1200℃煅烧膨胀,使其体积增大10～20倍,即制成膨胀珍珠岩。膨胀珍珠岩一般应用于建筑和其它工业上,现在国外在农业上也已大量应用,主要用于保水、保肥、改良土壤。主要效果有:1.保水效果好 10升膨胀珍珠岩可吸存7.7～9.3升水。有效保水量为36～63%,是砂质土的3～4倍。掺在砂质土壤中,可防止水分急剧蒸发、散失,抗旱效果好。
Perlite (or black rock, rosin rock) is crushed, sieved, processed into particles with a particle size of less than 5 mm, then preheated in a shaft kiln or rotary kiln at 300-400°C, and calcined at 800-1200°C. Expansion, to increase its volume 10 to 20 times, that is made of expanded perlite. Expanded perlite is generally used in construction and other industries. It has also been widely applied in agriculture abroad. It is mainly used for water conservation, fertilizer conservation, and soil improvement. The main effects are: 1. Good water retention effect. 10 liters of expanded perlite can absorb 7.7 to 9.3 liters of water. The effective water retention is 36 to 63%, which is 3 to 4 times that of sandy soil. When mixed in sandy soil, it can prevent rapid evaporation, loss of water and good drought resistance.