关键词: 白泥, 二氧化碳捕集, 吸附剂, 废物处理, 分解特性, 碳酸盐化特性

Abstract: Papermaking lime mud is an alkaline industrial waste，taking large land resources in landfill. The use of lime mud to capture CO2 from the industry flue gas is one of the effective ways to solve the problems. However，some fundamental problems still need to be investigated. This paper compared the calcination of lime mud and limestone，and investigated the carbonation of the calcined products in a TGA reactor. The results showed a higher decomposition rate for lime mud than for limestone，leading to a shorter time for complete calcination. After the same calcination process （850℃，N2，15min），CaO derived from lime mud showed a lower carbonation conversion ratio than limestone. This was likely because of the lower specific surface area of CaO derived from lime mud. The influence of temperature on the carbonation performance of the calcinates derived from lime mud and limestone was similar. Increasing temperature in the range of 600—700℃ did not have insignificant effects on the carbonation rate in the fast chemical reaction-controlled carbonation stage. However，it lengthened the fast carbonation stage and resulted in a higher ultimate carbonation conversion ratio.

Key words: lime mud, CO2 capture, sorbent, waste treatment, decomposition properties, carbonation properties