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Outline
In order to promote the resource utilization of coal gasification slag (CGS), the effect of composite excitation of four activators on the volcanic ash activity of CGS was studied by response surface method. The compressive strength of the prepared samples at different ages was measured respectively, and then the corresponding activity index was calculated to evaluate the volcanic ash activity. Meanwhile, a quaternary quadratic polynomial regression model for the effects of the dosages of four activators on the activity index was established, and the optimal composite excitation ratio of CGS was obtained through multi-objective optimization. The results show that in the process of composite chemical excitation, water glass has the greatest influence on the 3 d and 7 d activity index of CGS, and calcium carbide slag has the greatest influence on the 28 d activity index of CGS. The multivariate correlation coefficients of the three regression equation models are close to 1, which proves that the model has a good fitting effect. Numerical function of Design-Expert software was used to optimize the multi-objective. The optimal ratio of composite chemical excitation is obtained: the dosage of calcium carbide slag, desulfurization gypsum, sodium sulfate anhydrous and water glass is 0.97%, 1.61%, 2.55% and 10%, respectively. The absolute error between the measured value and the predicted value of the activity index on 3 d, 7 d and 28 d is not more than14%, and the relative error is not more than 7%, indicating that the regression model is reliable.
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| 科 Family | 属数 Number of genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) | 属 Genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) |
|---|---|---|---|---|---|---|
| 鹅膏菌科Amanitaceae | 2 | 11 | 5.26 | 鹅膏菌属 Amanita | 10 | 4.78 |
| 小菇科 Mycenaceae | 2 | 12 | 5.74 | 丝盖伞属 Inocybe | 5 | 2.39 |
| 多孔菌科 Polyporaceae | 8 | 14 | 6.70 | 蜡蘑属 Laccaria | 5 | 2.39 |
| 红菇科 Russulaceae | 3 | 23 | 11.00 | 小皮伞属 Marasmius | 6 | 2.87 |
| 小菇属 Mycena | 11 | 5.26 | ||||
| 光柄菇属 Pluteus | 5 | 2.39 | ||||
| 红菇属 Russula | 17 | 8.13 | ||||
| 栓菌属 Trametes | 5 | 2.39 |
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