The present situation, existing problems, and countermeasures for exploitation and utilization of low-grade potash minerals in Qarhan Salt Lake, Qinghai Province, China

2020 ◽  
Vol 35 (2) ◽  
Author(s):  
Ruiqin Li ◽  
Chenglin Liu ◽  
Pengcheng Jiao ◽  
Wanping Liu ◽  
Shijun Wang
Keyword(s):  
Salt Lake ◽  
Present Situation ◽  
Low Grade ◽  
Lake Qinghai ◽  
Qinghai Province ◽  
Existing Problems ◽  
Exploitation And Utilization ◽  
Qarhan Salt Lake

The effect of solvent chemistry on potassium dissolution extraction from low-grade solid potash ore in Qarhan Salt Lake, China

2020 ◽  
Vol 115 ◽  
pp. 104550 ◽  
Author(s):  
Ruiqin Li ◽  
Chenglin Liu ◽  
Pengcheng Jiao ◽  
Wanping Liu ◽  
Deguo Tang ◽  
...  
Keyword(s):  
Salt Lake ◽  
Low Grade ◽  
Effect Of Solvent ◽  
Solvent Chemistry ◽  
Qarhan Salt Lake

scholarly journals Distribution, Source Identification, and Assessment of Potentially Toxic Elements in the Sediment Core from the Estuarine Region of the Golmud River to the Qarhan Salt Lake, Qinghai, China

Minerals ◽  
2019 ◽  
Vol 9 (9) ◽  
pp. 506 ◽  
Author(s):  
Xiang ◽  
Wang ◽  
Chen ◽  
Ling ◽  
Han ◽  
...  
Keyword(s):  
Sediment Core ◽  
Salt Lake ◽  
Economic Status ◽  
Ecological Assessment ◽  
Qinghai Province ◽  
Pollution Levels ◽  
National Economic ◽  
Increasing Trend ◽  
Development And Utilization ◽  
Qarhan Salt Lake

The Qarhan Salt Lake has attracted increasing attention due to its significant national economic status and increased human activity, especially mining. Therefore, a sediment core collected from the confluence of the Golmud River to the Qarhan Salt Lake was chosen to investigate the concentrations, pollution levels, and ecological assessment of nine targeted elements (Al, As, Cd, Cr, Cu, Ni, P, Pb, and Zn). The excess 210Pb activities were calculated and a sedimentation rate of approximately 0.041 cm/y was estimated. Elements sources were identified, and the results show that Al, As, Cu, Ni, Pb, and Zn were mainly from natural sources, Cd and P were mainly from human input, and Cr appeared to have both sources. For Cd and P there was an increasing trend from 1987 and 1975, respectively, coinciding with the Chinese economic reform, Qarhan Salt Lake development and utilization, and also with the gross domestic product of Haixi State, Qinghai Province. Though the pollution and ecological assessment showed that there was nil to very low contamination and ecological risk, which is different from previous assumptions, the obviously increasing trend of Cd and P in the surface is still a concern. More attention should be paid to Cd and P in the further development of the Qarhan Salt Lake and the Golmud City.

scholarly journals Simulation study on the mining conditions of dissolution of low grade solid potash ore in Qarhan Salt Lake

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Ruiqin Li ◽  
Chenglin Liu ◽  
Pengcheng Jiao ◽  
Yufei Hu ◽  
Wanping Liu ◽  
...  
Keyword(s):  
Chemical Composition ◽  
Ph Value ◽  
Salt Lake ◽  
Selective Dissolution ◽  
Simulation Software ◽  
Low Grade ◽  
Potassium Fertilizer ◽  
Actual Production ◽  
Simulation Results ◽  
Qarhan Salt Lake

AbstractThe output and grade of liquid potash minerals in Qarhan Salt Lake are decreasing year by year, which has become the main problem restricting the sustainable production of potassium fertilizer. The exploitation and utilization of low-grade solid potash ore, which is in the strata of the Qarhan Salt Lake, represents the fundamental framework for the sustainable development of Qarhan Salt Lake’s potash fertilizer. PHREEQC is a simulation software for hydrogeochemistry. In this paper, PHREEQC was applied to simulate temperature, pH value and solvent chemical characteristics which affect the dissolution process of low-grade solid potash minerals. The simulation results indicate that the optimum temperature for ore dissolution is around 25 °C, because, around this temperature, the dissolving ability of solvents to low-grade solid potash minerals is enhanced, while the dissolving ability to halite remains basically unchanged, which is conducive to selective dissolution of low-grade solid potash. It is recommended the temperature is between 20 and 30 ℃. The simulation results show that, when the pH value of solvents is more than 9, although it is advantageous to selective dissolution of low-grade solid potash minerals, the solvent becomes strong alkali solution, which will cause environmental pollution and seriously corrode materials and equipment in actual production, so it is recommended the pH value of the solvent is adjusted between 6 and 8. The simulation results show that, when the values of K+, Na+, Mg2+, Ca2+, Cl− and SO42− in the solvent are 0.1%, 2.9%, 3.77%, 0.05%, 15.72% and 0.13% respectively, the solubility of low-grade solid potash ores is stronger, which is more conducive to selective ore dissolution. It is suggested that in actual production, the chemical composition of solvents prepared with old brine and fresh water should be as close as possible to the above chemical composition characteristics.

Research of Green Concrete

2012 ◽  
Vol 214 ◽  
pp. 353-357
Author(s):  
Shu Zhen Yang
Keyword(s):  
Building Material ◽  
Present Situation ◽  
Green Concrete ◽  
Existing Problems ◽  
The World

Concrete is the most widely used building material in the world, while with the large amount use of concrete, the pollution is becoming more and more serious. While green concrete can overcome ordinary concrete's shortcomings. This paper will introduce green concrete's features and analyze its prospect. What's more, according to the present situation of green concrete, points out some existing problems of green concrete, to these problems, put forward some suggestions to its development.

The Research on the Current Situation and Advances of Petrochemical Wastewater Treatment

2012 ◽  
Vol 550-553 ◽  
pp. 2416-2419 ◽  
Author(s):  
Wen Jun Xiang
Keyword(s):  
Organic Matter ◽  
Wastewater Treatment ◽  
Petrochemical Industry ◽  
Present Situation ◽  
Current Situation ◽  
High Salt ◽  
Petrochemical Wastewater ◽  
Existing Problems ◽  
The Future ◽  
At Home

At present, it is so prominent in the development of the petrochemical industry in China，and it is accompanied by petrochemical wastewater, which has become a big problem need to solve urgently.Because petrochemical wastewater mainly contains benzene-compound, organic matter, high salt wastewater and oil sewage, etc. They are very damaging and highly contaminated. The composition and properties of the petrochemical wastewater were introduced firstly, the current situation of petrochemical wastewater treatment at home and abroad were reviewed in the study. Especially the development of petrochemical industry in sichuan was introduced. Based on the present situation and the existing problems, put forward some countermeasures and expect technique develop direction in the future.

scholarly journals Element geochemistry of sediment in the core of 91-Ⅳ4 in Qarhan Salt Lake

1995 ◽  
Vol 7 (4) ◽  
pp. 321-326
Author(s):  
Liu Xingqi ◽  
◽  
Yu Shengsong ◽  
Shao Mingyu
Keyword(s):  
Salt Lake ◽  
Element Geochemistry ◽  
The Core ◽  
Qarhan Salt Lake

Implications of diverse sedimentation patterns in Hala Lake, Qinghai Province, China for reconstructing Late Quaternary climate

2012 ◽  
Vol 48 (4) ◽  
pp. 725-749 ◽  
Author(s):  
Bernd Wünnemann ◽  
Johannes Wagner ◽  
Yongzhan Zhang ◽  
Dada Yan ◽  
Rong Wang ◽  
...  
Keyword(s):  
Late Quaternary ◽  
Lake Qinghai ◽  
Qinghai Province ◽  
Quaternary Climate

Sr isotope and major ion compositional evidence for formation of Qarhan Salt Lake, western China

2018 ◽  
Vol 497 ◽  
pp. 128-145 ◽  
Author(s):  
QiShun Fan ◽  
Tim K. Lowenstein ◽  
HaiCheng Wei ◽  
Qin Yuan ◽  
ZhanJie Qin ◽  
...  
Keyword(s):  
Salt Lake ◽  
Western China ◽  
Sr Isotope ◽  
Major Ion ◽  
Qarhan Salt Lake

Information Resources Development in China

2010 ◽  
pp. 1973-1978
Author(s):  
Maosheng Lai ◽  
Xin Fu ◽  
Liyang Zhang ◽  
Lin Wang
Keyword(s):  
Academic Library ◽  
Present Situation ◽  
Cultural Development ◽  
Information Resources ◽  
Social Progress ◽  
Information Resources Management ◽  
Exploitation And Utilization ◽  
Government Project ◽  
Digital Library Project ◽  
Resources Development

In its several thousand years of social progress, China has put continuous effort into cultural development, which to a certain extent contributed to the exploitation and utilization of information resources. This article reviews the history and present situation of China’s information resources development (IRD), with the focus on some IRD projects launched since the mid-1990s. The specific projects that will be introduced include the China Academic Library and Information System, the China Digital Library Project, the construction of the China National Science and Technology Library, the China Online Government Project, and the construction of the National Institute for Information Resources Management. The goal of each project is described and its initial impact is discussed.

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