doi:10.16186/j.cnki.1673-9787.2022050026

Received:2022-05-10

Revised:2022-07-05

Online Date: 2022-11-15

Study of the effect of solubility on strongly ashed dolomite(Online)

CHU Xuewei, FU Hai, WANG Zhongmei, ZHANG Jiaxin, ZHANG Qilin

School of Resources and Environmental Engineering, Guizhou University, Guiyang 550025, Guizhou, China

Abstract:In order to reveal the dissolution characteristics of strongly tuffed dolomite, dissolution experiments were carried out in different acidic and fluid environments. The dissolution parameters of carbonate rocks, such as acid pH, specimen mass and pore space variation, calcium and magnesium ion release, were analysed, and the factors affecting the dissolution rate of strongly tuffed dolomite were discussed. The results show that: the acid pH=3 is the key point for the change of conductivity from large to small, highlighting the relationship between the consumption of H+ and the production of calcium and magnesium ions; the dissolution rate and dissolution amount of calcite of strongly tuffed dolomite are much larger than that of dolomite, and the dissolution effect is more obvious under the conditions of higher initial acid concentration; the increase of the number of pores increases the contact area between the rock and the acid solution, accelerating the dissolution rate; impurities will fill the rock The increase in the number of pores increases the contact area between the rock and the acid solution, accelerating the dissolution rate; impurities will fill the pores of the rock, reducing the damaging effect of the acid on the rock; the dissolution rate is greater under high acid concentration (pH≤3) and strong flow regime, the stronger the ability to dissolve the soluble material on the rock surface, when the acid concentration is lower (pH ≥4), the change in flow regime has less effect on the dissolution rate.

Key words:carbonate rock;chemical dissolution;mineral composition;hydrodynamic conditions;dissolution difference

CLC：P642.25