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标准造浆率是指：每吨土粉（允许加适量纯碱改型）所能配制成视粘度15厘泊的泥浆的体积数，代号为Q_(15)。大量试验分析对比资料说明，Q_(15)是区分造浆土粉优劣的主要依据。一九八○年七月，地质部探矿司和泥浆公司召开的造浆技术规范座谈会上，大家议论泥浆用膨润土分级方案，就是以Q_(15)来分为三级的；甲级土粉Q_(15)不小于16米~3/吨；乙级土粉Q_(15)不小于10米~3/吨；丙级土粉Q_(15)不小于6米~3/吨。对于如何求得各种土粉的Q_(15)，过去国内没有统一规定，不少单位都在摸索方法。这里介绍一种用双对数的计算法：
The standard slurry rate refers to the volume of mud with the viscosity of 15 cps, code Q_ (15), per tonne of powder (soda ash modification allowed). A large number of experimental analysis of comparative data shows that Q_ (15) is the main basis for the distinction between the advantages and disadvantages of pulping soil. In July 1980, at a symposium on slurry technology specifications held by the Exploration Division and Mud Company of the Ministry of Geology, everyone discussed that the classification scheme of bentonite for mud is based on Q_ (15). Grade A dust The Q_ (15) is not less than 16m ~ 3 / t; the Q_ (15) is not less than 10m ~ 3 / t; the Q_ (15) is not less than 6m ~ 3 / t. How to get a variety of soil Q_ (15), in the past there is no uniform regulation, many units are exploring ways. Here’s a double logarithm calculation method: