Hypogene enrichment in Miduk porphyry copper ore …

Two main HE generating mechanisms considered as hypogene leaching and subsequent reprecipitation and enrichment of originally chalcopyrite-bearing low-grade protore (0.2–0.5%) 1,6,7,8,9 ...

Leaching Process and Mechanism of Weathered Crust …

The leaching processes and mechanisms of weathered crust elution-deposited rare earth (RE) ores with ammonium sulfate were investigated for their high …

Research progress on leaching technology and theory of weathered …

Enhanced leaching process of a low-grade weathered crust elution-deposited rare earths ore with carboxymethyl sesbania gum. Hydrometallurgy (2013) ... climate, and ore characteristics on the ore beneficiation process, bio-oxidation studies on low-grade arsenic-bearing refractory gold ore by pool leaching were carried out, as well …

Enhanced leaching process of a low-grade weathered crust …

Enhanced leaching process of a low-grade weathered crust elution-deposited rare earth ore with carboxymethyl sesbania gum @article{Tian2013EnhancedLP, …

Leaching process of rare earths from weathered crust elution-deposited

4) The kinetics, hydrodynamic and mass transfer in leaching RE from the weathered crust elution-deposited rare earth ore provide a theoretic basis and a scientific approach with high efficiency and low consumption for this ore, which can be applied to optimize the RE extraction conditions, improve the RE recovery and inhibit …

Low-grade silicate minerals as value-added natural potash …

Title: Low-grade silicate minerals as value-added natural potash fertilizer in deeply weathered tropical soil Material Type: Book Subject: crop yield--mineral dissolution--natural potassic fertilizer--plant uptake--tropical soil Subject: journal article Description: High price of chemical potassium (K) fertilizers together with low K use efficiency in …

Leaching Process and Mechanism of Weathered Crust

The leaching processes and mechanisms of weathered crust elution-deposited rare earth (RE) ores with ammonium sulfate were investigated for their high efficiency and low consumption exploitation.

Optimisation of mass transfer in column elution of rare earths from low

These results highlight a new approach for making the leaching process of low-grade weathered crust elution-deposited rare-earth ore more efficient and also for lowering the lixiviant consumption ...

Double reverse flotation of a very low grade

In this study, reverse flotation was applied to recover phosphate from a very low grade (5.01% of P 2 O 5) sedimentary ore.Sodium silicate, starch, tannic acid, aluminum sulfate, (Na,K)Tartarat, sodium tripolyphosphate, H 3 PO 4, and H 2 SO 4 were used as phosphate mineral depressants in acidic and alkaline conditions. Oleic acid and …

Minerals | Free Full-Text | Accessing Metals from Low-Grade …

The low-cost advantage of bioleaching can be realized in both low-grade ores and mine tailing leaching, with the latter achieving a higher yield. However, it is important to note that the scaled-up bioleaching process undergoes similar pre-requisite energy-consuming blasting and grinding treatments, as shown in Table 1 and Table 2 .

New weathering classification system of rocks based on the …

It had low porosity of 2.6% and UCS of 83.7 MPa. Results and discussion. Mineral composition of fresh and weathered rocks. The mineral composition of greywacke ... However, multiple regression analysis indicated that these parameters can be used to predict the weathering grade. In slightly weathered sandstone ...

Weathering Processes and Mechanisms of Low-Grade …

1. Introduction. Low-grade metamorphic rock, such as slate and phyllite, a thin rock found around mountainous permafrost regions, is weathered to the freeze-thaw process, and this represents a significant hazard in rock engineering. The rock can break down after F-T cycles and accumulates in valleys of mountainous permafrost regions, …

Sustainable Use of Copper Resources: Beneficiation of Low-Grade …

The global market has announced copper as a modern energy metal and finds its extensive utilization in the construction industry, electrical wiring, power transmission lines, alloying, anticorrosive coating, heat exchangers, refrigeration tubing, etc. Copper ore is primarily beneficiated from sulphide mineral deposits. Due to high-grade …

Minerals | Free Full-Text | Optimization of a Rare Earth and

Ammonium sulfate is typically employed as a leaching agent in the in situ leaching of weathered crust elution-deposited rare earth ore. However, it is associated …

Effect of particle size on the leaching of a weathered crust …

Furthermore, the rare earth grade, specific surface area (SSA), surface morphology and mineral composition of the sieved samples with different particle sizes were evaluated. ... Enhanced leaching process of a low-grade weathered crust elution-deposited rare earth ore with carboxymethyl sesbania gum. Hydrometallurgy, 139 (2013), …

Readsorption of rare earth elements during leaching process …

Optimisation of mass transfer in column elution of rare earths from low grade weathered crust elution-deposited rare earth ore. Hydrometallurgy. …

Recovery of rare earths from weathered crust elution-deposited rare

Moreover, based on the fact that there is low magnesium content and low demand of magnesium content (hardness) in the underground water and surface water ... Enhanced leaching process of a low-grade weathered crust elution-deposited rare earth ore with carboxymethyl sesbania gum. Hydrometallurgy, 139 (2013), pp. 124-131.

Low-Grade Fever: Symptoms, Causes, Diagnosis, Treatment

A normal body temperature is typically described as 98.6 F (37 C) but can range from 97 F (36.1 C) to 99 F (37.2 C). A low-grade fever is often the first sign of an infection. When the body temperature is normal, infectious bacteria and viruses are able to thrive. A fever is the body's way of creating a hostile environment to help neutralize them.

Weathering

Weathering describes the breaking down or dissolving of rocks and minerals on the surface of the Earth. Water, ice, acids, salts, plants, animals, and changes in temperature are all agents of weathering. Once a rock has been broken down, a process called erosion transports the bits of rock and mineral away. No rock on Earth is hard …

Research on aid-leaching rare earth from low-grade weathered …

Aiming at the problems exist in the permeability of low-grade weathered crust elution-deposited rare earth,sesbania gum,which has an ability of enhancing the permeability,was employed as leach-aid agent to improve the leaching efficiency in this thesis.The effect that the concentration of sesbania gum,the concentration of lixiviant,leaching velocity and …

Beneficiation of Clay-Rich High-LOI Low-Grade Iron Ore …

The low-grade dumped IOF (below 10 mm) available at the mines with high LOI (excluding the season-dependent surface moisture of 3.6% that has been removed initially at 105 ℃ present in the IOF) was used for the present investigation. ... The weathered iron phase minerals are surrounded by the clay phase minerals, which are …

Optimisation of mass transfer in column elution of rare …

Authors: Tian Jun. Jiangxi Academy of Sciences. Yin Jingqun. Chen Kaihong. Rao Guohua. Abstract. An investigation was carried out to optimize the leaching and …

Leaching of rare earths and aluminum in weathered crust …

Aluminum is the main impurity of the weathered crust elution-deposited rare earth ore (WCED-REO). Efficient leaching of rare earths and low leaching of aluminum are of great importance for the leaching of the WCED-REO. ... forming WCED-REO with very low grade (REO 0.03%–0.1 %), which cannot be enriched by conventional physical …

Study on the Leaching Kinetics of Weathered Crust Elution

In the process of the in situ leaching of weathered crust elution-deposited rare earth ores (WCE-DREOs), there are many problems in the conventional leaching agent, such as a slow leaching rate, low leaching yield and long leaching period. In order to solve the above problems, 2.0 wt% ammonium sulfate was mixed with hydroxypropyl …

Research on aid-leaching rare earth from low-grade …

Aiming at the problems exist in the permeability of low-grade weathered crust elution-deposited rare earth,sesbania gum,which has an ability of enhancing the …

Recovery of rare earths from weathered crust elution …

Enhanced leaching process of a low-grade weathered crust elution-deposited rare earth ore with carboxymethyl sesbania gum. Jun Tian Jing-qun Yin Xuekun Tang Ji Chen Xianping Luo G. Rao. Materials Science, Chemistry. 2013; 57. Save. Selective separation of rare earths and impurities from ilmenite ore by addition of K+ and …

Low-grade silicate minerals as value-added natural potash …

DOI: 10.1016/j.geoderma.2023.116433 Corpus ID: 257831755; Low-grade silicate minerals as value-added natural potash fertilizer in deeply weathered tropical soil @article{Basak2023LowgradeSM, title={Low-grade silicate minerals as value-added natural potash fertilizer in deeply weathered tropical soil}, author={Biraj Bandhu Basak …