Effects of MgSO4/MgCl2 on FGD Gypsum Solubility and Whisker Crystallization
Journal Title: 河南科技大学学报（自然科学版） - Year 2018, Vol 39, Issue 2
Abstract
Taking the purified flue-gas desulfurization ( FGD) gypsum as raw material, the calcium sulfate whiskers were prepared by hydrothermal method.The effects of additive MgSO4 or MgCl2 on the microstructure, aspect ratio of whiskers and the solubility of treated FGD gypsum were investigated. The ionization and hydrolysis characteristics of MgSO4 or MgCl2 in the reaction solution and their mechanism were discussed. The results show that the crystallization of calcium sulfate whiskers can be improved and their aspect ratio can also be increased via the addition of MgSO4 or MgCl2, but the phase of whiskers remain unchanged. When the dosage ( mass fraction) of MgSO4 is 2.0% and the dosage ( mass fraction) of MgCl2 is 1.5%, the aspect ratio of the prepared whiskers is 80 and 110, respectively.The solubility of FGD gypsum is decreased by adding MgSO4 into solution, because the common ion effect plays a dominant role. While the solubility of FGD gypsum is increased by MgCl2. The effect of MgCl2 on whisker crystallization is better than that of MgSO4 because the neutral ion pairs of MgSO4 ( 0) play a dominant role on the relative stability of the whole ions concentration.
Authors and Affiliations
Xiao WANG, Biao JIN, Xiaoting ZHANG, Xueping LIU, Liushuan YANG
Keywords
Related Articles
- EP ID EP464695
- DOI -
- Views 54
- Downloads 0
Stress Relaxation Behavior of Al_2O_3/ Cu Dispersion Strengthened Copper Alloy
The stress relaxation behavior of Al_2O_3/Cu dispersion strengthened copper alloy at different temperature( room temperature,100 ℃,200 ℃ and 300 ℃) was studied by the stress relaxation experiment.The test data were fitte...
Identification of Key Ports in Global Container Shipping Routes Network
Aiming at the present conditions that the identification methods and measurement indexs of key ports were relatively isolated and single respectively,based on complex network theory,the ports ranking in the shipping rout...
Method of Determining Design Time Based on Similarity Degree of Products
To solve the problems that product design time was difficult to be forecasted accurately and traditional estimation methods had large error, a design time estimation method was proposed based on similarity degree of prod...
An Improved DV-HOP Localization Algorithm in Wireless Sensor Network
For the poor performance of distance vector-hop( DV-Hop) location algorithm in positioning accuracy caused by irregularity and mirror error in the large scale of wireless sensor networks,an improved DVHOP localization al...
Effects of Salicylic Acid on Seed Germination of Prunella Vulgaris under Drought Stress
Prunella vulgaris seeds were presoaked with different concentrations( 0. 5 ~ 3. 0 mmol / L) salicylic acid( SA). Then Prunella vulgaris seeds were soaked in 0. 2 g / mL polyethylene glycol 6000 for simulating drought str...