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Method for preparing water reducer of gypsum cementitious material by using pulp waste liquid
The invention relates to a preparation process for producing a water reducer of a gypsum cementitious material by taking a sulfite pulp waste liquid as the raw material. The preparation process comprises the following steps: 1), lignosulfonate is settled out: calcium substances are added to the pulp waste liquid for alkalization, and a calcium lignosulfonate precipitate is obtained; 2), the precipitate is filtered and subjected to an acidification process: a purified calcium lignosulfonate solution is obtained through settlement, filtration and the acidification process; 3), a fine purification process is performed: ultrafiltration purification is performed; 4), a compounding modification process is performed: a water reducer is added to be compounded with the calcium lignosulfonate solution obtained in the step 3), and a modified water reducer is obtained. The method has the advantages as follows: the waste liquid in the industry of paper making with pulp is used effectively, environmental protection is realized, resources are saved, and accordance with the sustainable development strategy is realized; the content of the lignosulfonate is increased greatly after purification with an ultrafiltration method, the weight-average molecular weight and the number-average molecular weight are increased greatly, and the molecular weight distribution is more uniform.
Method for preparing water reducer of gypsum cementitious material by using pulp waste liquid
The invention relates to a preparation process for producing a water reducer of a gypsum cementitious material by taking a sulfite pulp waste liquid as the raw material. The preparation process comprises the following steps: 1), lignosulfonate is settled out: calcium substances are added to the pulp waste liquid for alkalization, and a calcium lignosulfonate precipitate is obtained; 2), the precipitate is filtered and subjected to an acidification process: a purified calcium lignosulfonate solution is obtained through settlement, filtration and the acidification process; 3), a fine purification process is performed: ultrafiltration purification is performed; 4), a compounding modification process is performed: a water reducer is added to be compounded with the calcium lignosulfonate solution obtained in the step 3), and a modified water reducer is obtained. The method has the advantages as follows: the waste liquid in the industry of paper making with pulp is used effectively, environmental protection is realized, resources are saved, and accordance with the sustainable development strategy is realized; the content of the lignosulfonate is increased greatly after purification with an ultrafiltration method, the weight-average molecular weight and the number-average molecular weight are increased greatly, and the molecular weight distribution is more uniform.
Method for preparing water reducer of gypsum cementitious material by using pulp waste liquid
MA BAOGUO (author) / LI XIANLIANG (author) / LU SIWEN (author) / SU YING (author) / JIN ZIHAO (author) / ZHU LU (author) / HE XINGYANG (author) / ZHI ZHENZHEN (author)
2015-12-16
Patent
Electronic Resource
English
IPC:
C04B
Kalk
,
LIME
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