قائمة الطعام
Gypsum mines may release sediments, heavy metals, and other pollutants into rivers and streams, negatively impacting water quality. This pollution can harm aquatic life, disrupt ecosystems, and ...
The quantification and the comparison between the systematic effects of Fe 2+ on gypsum bulk crystallization were performed with three different gypsum solutions ([Ca 2+]: 1600 (40), 2400 (60), 3200 (80) mg/L (mM)).Under these conditions, the process solution was supersaturated with respect to gypsum as presented in Table S1 …
a global literature review. It reveals 27 different impacts (23 socio-economics and 4 political) associated with the industry. The socio-economic impacts found in literature are : income ...
The only study on the effects of AMF inoculation after gypsum mining (Khabou et al. 2014) was performed with one AMF. Actually, the effects of AMF inoculum on plant growth and on indigenous AMF communities are still difficult to predict. Our experiment was designed to participate for the first time to the restoration of a gypsum …
However, gypsum is also a major economic resource for mining (Al-Harthi 2001; Mota et al. 2003Mota et al., 2004Pulido-Bosch et al. 2004). Quarrying activities generally inflict heavy impact at ...
Therefore, the effects of the gypsum on the sodic spoil and plant community were what one should expect during average climatic conditions. Plant Biomass ... The effect of wood residue and gypsum amendment of bentonite mine spoils on annual forb biomass over years, 19118-1999, Upton, Wyo. Wood residue application (M&r/ha) 0 45 90 135
The impacts of quarrying of the gypsum deposits on the environment at Maqna, Tabuk, were evaluated by intensive field studies including in situ testing, mapping and sampling of gypsum and well water. Field and laboratory tests were made to determine the engineering properties including tensile and compressive strengths, unit weight, fracture spacing and …
The preparation of the gypsum used to evaluate the particle size effect on sphalerite contact angle was carried out as follows: a sample of 5 g of reagent grade gypsum was dry-ground in an agate mortar during 5, 10 and 20 min to obtain different size fractions.The samples were characterized with the aid of a Coulter LS-100 particle size …
1. Introduction. Gypsum, cement, and lime are traditional cementitious materials. Calcined gypsum (β-hemihydrate gypsum, β-CaSO 4 · 0.5H 2 O) is an air-hardening cementitious material that is formed by the dehydration of dihydrate gypsum (including natural dihydrate gypsum and chemical gypsum) at a temperature of …
Effect of Slag Gypsum Binder as a Substitute to Cement on the Stability of Backfill Mining Yang Xiaobing 1, 23, Yan Zepeng *, Li Weiguang, Wang Leiming1,3 and Yin Shenghua1,3 1School of Civil ...
The study looks at the economic, social and environmental impacts of the gypsum mining on people living nearby as well as at the national level. However, given the non …
"[Gypsum mining] has had harmful effects. Medical experts say mining can have [a] serious impact on [the] health of people and this may cause damage to their lungs," says Mubashir Ahmad, coordinator of CEE Himalaya. According to the organization, suspended particulate matter has increased greatly in the area, due to the mining of …
The ultimate tensile strengths of concrete and gypsum were measured as 1.8 and 1.3 MPa, respectively. The crack growth of the concrete and gypsum samples subjected to Brazilian tests are shown in Fig. 5 a and b. Uniaxial compression test was conducted on the gypsum and concrete specimens with 300 * 160 * 75 (mm) dimension …
California News. [email protected]. Dec 5, 2019. EL CENTRO, Calif.–. The Bureau of Land Management has released the Final Supplemental Environmental Impact Statement (EIS) for the proposed …
1. Introduction. Gypsum-salt rock, composed mainly of gypsum and anhydrite with small amounts of rock salt, salt minerals, dolomite, and some other constituents, is one of the major evaporite rock types (Calaforra and Gazquez, 2017; Benamara et al., 2017; Liu et al., 2017).Due to the characteristics of gypsum salt, such as solubility, variability, …
However, the effects of TG on the high-calcium FA–CCR system and the transformation rule of Fe compound in TG remain unclear. Therefore, FA–CCR and FA–natural gypsum–CCR were used as the control group. The effects of TG on the physical properties, phase composition, and microstructure of the FA–CCR system were …
An abandoned gypsum mine has been discovered beneath the route of a highway construction in Hunan province, south China. Due to the highway construction and operations safety, there is an urgent need for a comprehensive stability analysis of the abandoned mining area. The 3D laser scanning detection technique has been adopted, …
Effect of magnesium on sulphate removal from mine water as gypsum was investigated. Calculations with MINEQL+ and jar test experiments were conducted at two pH values. At pH 9.6 magnesium inhibits the precipitation of sulphate as gypsum. At pH 12.5 magnesium could have a positive effect on sulphate removal.
Phosphogypsum (PG) is an industrial by-product from the wet preparation of phosphoric acid. Phosphorus building gypsum (PBG) can be obtained from PG after high-thermal dehydration. Improving the properties of PBG is of great significance to extending its application range. In this paper, PBG was modified by particle shaping, resultantly its ...
Texas is a major producer of industrial mineral resources required by the state's ever-growing population that now exceeds 28 million. Texas typically ranks in the top three states for the value of non-fuel mineral production with a total value of $5.2 billion in 2017, accounting for 6.9% of the total US mineral value. Almost 90% of current Texas …
The impact of gypsum mine water: ... Combined effects of all contaminants caused genotoxicity. Abstract. The aim of our study was to investigate how exposure to heavy metal-rich waters from gypsum mining affects the morphology and levels of primary DNA damage in Gammarus balcanicus. Chemical analysis revealed increased …
Thus magnesium was preventing the removal of sulphate as gypsum (CaSO4·2H2O). However, change in the lime precipitation pH from 9.6 to 12.5 resulted in magnesium hydroxide (Mg (OH)2 ...
The largest gypsum crystal was found in the Braden mine in Chile and exceeds 3 metres (about 10 feet) in length and 0.4 metre (about 1.5 feet) in diameter. In the U.S., commercial sedimentary …
Relation to Mining. IMAR 7 th Edition. Most of the world's gypsum is produced by surface-mining operations. In the United States, gypsum …
Abstract. The aging properties of gypsum extracted from two underground mines in France (Livry–Gargan and Grozon) have been highlighted by means of observation performed using scanning electron ...
Aluminum (at high temperatures), diazomethane. irritation eyes, skin, mucous membrane, upper respiratory system; cough, sneezing, rhinorrhea (discharge of thin nasal mucus) Not available. Calcium (II) sulfate dihydrate, Gypsum stone, Hydrated calcium sulfate, Mineral white [Note: Gypsum is the dihydrate form of calcium sulfate; Plaster of Paris ...
Furthermore, the added cost of the mining, grinding, and separation of natural minerals makes mineral carbonation economically unfeasible [7]. ... The effect of ammonia content on gypsum carbonation was evaluated by varying the ammonia content in the 90–120% stoichiometric range (samples A1 through A4). ...
A long time lag is the main characteristic of gypsum mined gob collapse disasters. With the coring of a gypsum rock specimen from the supporting pillars in gob, which formed over several years, the strength weakening effect of the gypsum rock with long-term overlying strata pressure is revealed by experimentation. The results show …
Gypsum amendment and seasonal variability: effect on soil quality, fruit characteristics and toxicological responses of Cucumber (Cucumis sativus l.) in the Ahafo-Kenyasi Mining Area of Ghana
5 Citations. Explore all metrics. Abstract. The impacts of quarrying of the gypsum deposits on the environment at Maqna, Tabuk, were evaluated by intensive …
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