Characteristics Of Mine Water Research Articles

Research on zero discharge treatment technology of mine wastewater

In order to solve the problem of mine water treatment in the production process of coal mine enterprises, the source and characteristics of mine water are introduced, and the zero discharge technology of mine water is studied and applied in engineering, the zero discharge technology of mine water includes three stages: pretreatment, concentration and reduction, and evaporation and crystallization. The results show that: for the mine water with TDS mass concentration of 3200 mg/L, coagulation clarification process is used for pretreatment, reverse osmosis+DTRO is used for concentration and reduction, MVR is used for evaporation and crystallization, the TDS concentration of concentrated water after treatment is 142000 mg/l, the recovery rate of the system is 84.5%, and the TDS of final water production is about 418 mg/l, which meets the design and reuse requirements. The sodium sulfate produced in the evaporation crystallization stage is about 4.9 t/h, and its purity is 99.12%, which can be used as chemical raw material.

Determining the Quality of Mine Gushing and Mixed Water Using Coupled AHP and Fuzzy Comprehensive Evaluation Methods

This study focused on analysis of the chemical characteristics of mine waters. The aim of this study is to correlate the degree of different ionic components in mine water and the influence of their convergence using a combination of the three-scale AHP and fuzzy evaluation methods for the comprehensive evaluation of water quality. Ion chromatography (ICS 1100) has been used to analyze the content of the water sample while portable pH/EC/TDS/Tem- perature meters (SX 811 and SX 813) were used to test physical-chemical parameters. The results of this study show that chemistry of in No.11 gushing mine is dominated by HCO3-Na and HCO3-Ca, and had a pH between 7.1 and 8.00, belonging to neutral or slightly alkaline water. In addition, water were found to have the hardness between 18 mg/L and 542.5 mg/L. Results also show that the TDS of the roof sandstone and goaves water are higher than Cambrian limestone water, while the turbidity of the mixed water is 20 NTU in the sump, again higher than in other samples such as Cambrian limestone water. Total dissolved solids and the total hardness of Cambrian limestone groundwater mainly depend on the content of K+ + Na+, Ca2+, B={b1,b2,…,bj} and SO2-4. Thus, chemical composition changes remarkably after mine water mixing. Results showed that the coal roof sandstone water is class V while that in the sump is class III, and the Cambrian limestone groundwater is class I. In gushing, the quality of water can vary greatly; thus, water from the coal face roof sandstone and the Cambrian limestone should be stored and treated separately before being utilized.

Physicochemical characteristics of mine waters in the Urals

Physicochemical characteristics of mine waters in the Urals

Corrosivity of Underground Mine Atmospheres and Mine Waters: A Review and Preliminary Study

AbstractThe causes of the corrosivity of mine atmospheres and mine waters are described in detail. The principal factors promoting atmospheric corrosion in underground coal mines are high relative humidity (>90%), high temperature (∼30°c) and airborne dusts. The characteristics of mine waters are presented and discussed. The causes of the acidity of mine waters have been explained in terms of the decomposition and oxidation of pyrites, the presence ofthiobacillusthio-oxydansand thiobacillusferro-oxydans,etc., and the presence of peaty acids. The acidity of mine water contributes both directly and indirectly to the corrosivity.About twenty mine water samples from Jharia coal mines were selected for preliminary studies. The samples were found to be slightly acidic or neutral and only mildly corrosive. Some mine waters corroded to the same extent whether they had a negative or positive value of the saturation index. This has been attributed to the presence of aggressive ions, i.e., chloride and sulphate, in ...

鉱水の地化学的研究

This paper is concerned with the analytical results of the mine water of the Kamikita and the Tatemato Mine as well as with the experimental results abnut the chemical and physical behaviors of pyrites and chalcopyrites from various localities.The pH of the water solutions of pyrites varies between 2.5 and 4.5, and it appears that the solution of pyrite of higher temperature origin shows higher pH than that of pyrite of lower temperature origin, independently of the amounts of solved sulphur.Chalcopyrites are classified into two groups, higher temperature origin and lowerone, from the. chemical behaviors when solved in dilute sulphric acid, and it seems that from the D. T. A. curves the former chalcopyrite is oxidized more easily than the later one.It is concluded that the characteristics of mine water are influenced not only bythe mineral compositions of the are deposits and their wall rocks, but also by the chemical and physical behaviors of the main ore-forming sulphide minerals.