limestone dewatering optimization

Hybrid approach is applied to derive the optimum dewatering scheme for safe mining of limestone in the Adanakurichi limestone mines of Tamil Nadu, India and …

Design optimization of construction dewatering has important values in protecting the surrounding environment and reducing the engineering cost. The existing dewatering design methods are mostly based on the optimization of pumping rate needed to maintain a stable water level, while the drop and rise of water level are not considered …

It might also be used on ferrous iron AMD. A two-step process is required. First, the AMD is treated with limestone to a pH of 4.0 to 4.5 to take advantage of the pH range when limestone is most effective, The water then passes to a second reactor where lime is applied to raise the pH range to the desired level.

Hybrid approach is applied to derive the optimum dewatering scheme for safe mining of limestone in the Adanakurichi limestone mines of Tamil Nadu, India and …

Hydrocyclone plays a vital role in the progress of WFGD in the power plants. Such as the choosing of particle size of limestone, dewatering of gypsum slurry, recycling of waste water. This paper introduced the theory and application of hydrocyclone in WFGD process, and also expounded and researched separately on the relationship of the performance …

This paper deals with filtration of very-fine size ground brecciated calcitic limestone ore slurry using flocculant chemicals. Screening of flocculants was carried out using capillary suction time (CST). Optimization of the neutral slurry filtration behaviour was carried out using a commercial non-ionic type polyacrylamide based synthetic …

Local mass and momentum balances over the fluid and solid phases of the suspension in a 1-D Cartesian co-ordinate z lead to two couple first-order equations for the local gradients of the solids volume fraction ϕ and the solids flux ψ [23]: (4) ∂ ϕ ∂ z = 1 D (ϕ) ψ-ϕ dV dt ∂ ψ ∂ z = ∂ ϕ ∂ t where D(ϕ) (m 2 /s) is the solids diffusivity. The first equation …

Phosphate materials were used as an oxic limestone drain to evaluate the increase in the pH of the AMD and metal removal by sorption and precipitation mechanisms. The results showed that all phosphatic lithologies were efficient in the passive treatment of AMD. The pH rapidly increased from 3.08 to 8.47 during water-rock …

The results indicate that the dewatering optimization procedure developed in this paper can serve as a useful template and framework for solving mining related water problems. View Show abstract

This study assessed the feasibility of different methods for sulfate optimization of limestone calcined clay cements (LC 3). LC 3-based pastes were studied with kaolinite and montmorillonite calcined clays and different gypsum contents. Quartz powder was used in reference systems. The sulfate optimization was done using …

The optimization calculations include process and cost models. The process model describes the most important stage of SO 2 removal that runs in the absorber and in the holding tank. It includes absorption of sulfur dioxide, oxidation of SO 2– 3, dissolution of limestone, and crystallization of gypsum. The model was applied to calculate ...

Through dewatering process energy optimization, high moisture gasification fine slag can be removed about 15% water within 30s and energy consumption of efficient dewatering is 2.63 kJ/g which is much lower than that of drying. Efficient dewatering is benefit to the GFS recycling which reduces hazardous materials release …

In addition to using conventional inorganic coagulants in primary sludge conditions, Xia et al. (2016) studied the influence of AlCl 3 on deep dewatering of dewatered-sewage sludge and found that the MC of filter sludge cake decreases from 73.41% to 54.03% when the dose is 8 g AlCl 3 /300 g of dewatered-sewage sludge.

This study focuses on optimizing the foundation pit dewatering scheme using the foundation pit dewatering theory and the principles of multi-objective optimization. It explores the development of a multi-objective optimization model and efficient solution technology for foundation pit dewatering. This research focuses on the …

Optimization dewatering scheme. From the perspective of economy and underground engineering construction safety in the paste and salt areas, the …

A detailed process model of the wet limestone flue gas desulfurization system has been presented. This model can be used to calculate indispensable parameters for estimating costs and next to minimize capital and operating costs. The process model describes most important stage of SO2 removal running in an absorber and a holding …

Optimization of sludge conditioning and dewatering is a continuing challenge for wastewater treatment plants. This study investigated the use of an in-line UV–vis spectrophotometer to optimize the polymer dose during sludge dewatering. The study established a relationship between the optimum polymer dose and residual …

Impacted by groundwater, faults, lithology, and other factors, the slope of the Shengli no. 1 open-pit coalmine has been in a state of instability. Among these factors, groundwater in the quaternary aquifer is considered primary. Thus, an optimum design for dewatering well pumping rates is presented in this paper. A two-dimensional …

PREDICTING WATER CHEMISTRY OF FGD BLOWDOWN. The characteristics of FGD blowdown will vary depending on the chloride concentration that drives the number of times the water can be concentrated. The magnesium‐to‐calcium ratio of the limestone will drive the amount of magnesium in solution. The sulfur‐to‐chlorine ratio of the coal will ...

The industrial process of 129 WFGD consists of different sub-processes: the preliminary steps are limestone grinding, water-limestone 130 slurry preparation and flue gas adequation; the absorption ...

Sludge dewatering is the fundamental process of sludge treatment. Environmentally friendly and efficient sludge conditioning methods are the premises of sludge to achieve dehydration reduction and resource utilization. In response to sewage plant sludge dehydration, fly ash (FA), polymerized aluminum chloride (PAC), and …

Dewatering tests were performed with a 70 mm diameter filtration-compression cell to measure limit dryness according to French standard (NF-T97001-1, 2018). Centrifugability was evaluated in a basket centrifuge by spin tests and/or in a screw lab centrifuge with an inner diameter of 60 mm and 230 mm length, operating at 10–30 …

The aim of optimization was to check the effectiveness and reliability of alternative layouts, involving intermediate product (gypsum) storage in the absorber …

In an effort to remedy this problem, this research aims to implement the accelerated weathering of limestone (AWL) process to capture CO 2 from cement …

The limestone and sludge ash also reacted with bed material to form more bed ash, as the bed ash in the C1 test was detected to contain more calcium and silicon. Since the fine particles that passed through the cyclone often contain a greater content of heavy metals, it is preferable to target the reduction of fly ash production to minimise the ...

Dewatering In copper concentration plants, approximately 40–60% of the total amount of water lost is retained in Optimization slurries in the tailings. In this paper, we present a …

The use of water from mine dewatering has become increasingly important issue in northern China. Much of this water is discharged to the environment, which wastes a valuable resource and pollutes the ecosystem. To help address this, a feasibility analysis was carried on using deep Ordovician limestone water from dewatering at the …

Dewater boreholes cross-section plotting The full range Ordovician limestone group boreholes dewatering test had began at 12, on May 6, 2008 and ends at 12, on May 25, 2008, taking 19 days. The process of dewatering test contained three stages: initial dynamic observation of groundwater, official start of dewatering and observation of …

The optimized dewatering scheme with a curtain depth of 60 m and a hydraulic conductivity of 0.00518 m/d, and four rows of dewatering wells with an equal row spacing of 40 m, well depth of 50 m, and well spacing of 12.5 m in each row can …

Sewage sludge (SS) dewatering is a key step in sludge disposal, which plays an important role in reducing sludge volume, facilitating transportation and subsequent treatment. In this paper, a facile hydrothermal-alkaline treatment for SS was proposed, which can be used for sludge dewatering and humic acid (HA) recycling at the same …

For example, Qi et al. demonstrated the application of particle swarm optimization (PSO) and adaptive neuro-fuzzy inference system (ANFIS) for predicting the initial settling rate, which is the key performance metric for any dewatering process. Flocculation-settling experiments were conducted using the anionic polyacrylamide …

In this article the method of cost optimization of the "Wet Limestone Flue Gas Desulfurization System" is presented. The optimization calculations include process and cost models. The process ...

Flue gas desulfurization (FGD) systems using lime or limestone as the chemical reagent are widely used throughout the world for SO 2 emissions control at coal-fired power plants. Ammonia-based ...

The design and optimization of the dewatering scheme for deep foundation pits in a highly permeable heterogeneous layer are critical to protect water resources, control subsidence and mitigate environmental impacts. ... The bedrock on the left bank of Chongjiang River consists of limestone of the Qiongcuo Formation (D 2 q 1–3); ...

Coal and water resources have played important roles in China's social and economic development. Thus, accurate and reliable predictions of coal mine water inflow and aquifer water level variations are required to ensure mining safety and assess the impact of coal mining on groundwater aquifers. A three-dimensional numerical model …

The wet flue gas desulphurization has been the most widely used in the coal-fired power plants because of high SO 2 removal efficiency, reliability and low utility consumption. In this paper, laboratory studies on the removal of SO 2 from gas mixtures with a novel wet-type PCF device (Chinese LOGO) were reported, CaCO 3 -in-water …

Influence of rheology in the filtration of leach slurry generated by alkaline pressure leaching of a limestone ore. Cleaner Chemical Engineering 2022, 4, 100079. ... This paper describes these …

Formic and maleic acid gave a lower increase in the SO 2 removal because the effective pKa values (3.8 and 3.6 at 25°C) were below the optimum range of 4–5.5. …