A Water-retaining Agent of Oil-tea Camellia Dregs Biochar and Its Applications in Soil Improvements

摘要

#$%^&*AU2020101477A420200827.pdf#####Abstract of Description This invention discloses a water-retaining agent of oil-tea camellia dregs biochar and its application in soil improvements. It is produced after compounding with oil-tea camellia dregs as the raw material of biochar, and polyacrylamide, sodium polyacrylate, cross-linked carboxymethyl cellulose or cross-linked polyvidone as the water absorbent, whose specific surface area is greater than 2300m 2/g. The preparation method is: place the dried oil-tea camellia dregs into an air-tight container and then put the container in the preheated muffle furnace for staged carbonization. The biochar obtained in this way has a larger specific surface area and strong absorption abilities, which can be used as water-retaining agents directly. The biochar obtained through carbonization with the water absorbent is modified step by step to produce the water-retaining agents; then hydroxypropyl cellulose is added to further improve the water holding ability of water-retaining agents. Easily available and economical, the raw materials of water-retaining agents are suitable to be promoted in agriculture and forestry.