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Concrete degradation - Wikipedia

The chemistry involving leaching of calcium hydroxide from concrete can facilitate the growth of calthemites up to ≈200 times faster than cave speleothems due to the different chemical reactions involved. The sight of calthemite is a visual sign that calcium is being leached from the concrete structure and the concrete is gradually degrading.

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Microwave caustic leaching of electric arc furnace dust ...

Download Citation on ResearchGate | Microwave caustic leaching of electric arc furnace dust | Electric arc furnace (EAF) dust is a waste product which is generated when steel scrap is melted in an ...

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Caustic Cleaning and Leaching Autoclave Systems - WSF ...

WSF Caustic Cleaning and Leaching Autoclave Systems are custom designed and manufactured at our facility for operation with concentrated caustic solutions at elevated temperatures and pressures. Nickel alloys and other special materials are used to protect surfaces that come in contact with the caustic solution. Both temperature and pressure may be variably controlled.

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INVESTIGATION OF LEACHING KINETICS OF CERUSSITE IN .

hydroxide as leaching agent to recover lead from electric arc furnace dust, and showed that 90% of lead was dissolved under the following optimum conditions: .

  • Published in: Physicochemical Problems of Mineral Processing · 2015Authors: Qicheng Feng · Shuming Wen · Yijie Wang · Wenjuan Zhao · Jiushuai DengAffiliation: Kunming University of Science and TechnologyAbout: Activation energy · Leaching · Kinetics · Sodium hydroxideGet Price

Recovery of Refractory Metals from Steelmaking Dust using ...

hydrometallurgical method was used to recovery molybdenum from steelmaking dust using sodium hydroxide (alkaline leaching). Leaching was done with a constant solid/liquid ratio of 1:50. The optimum leaching conditions were found to be 0.5M sodium hydroxide, 25oC and 5 minutes. The leaching efficiencies oobtained were 48% and 52% at 60oC and 90 C

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Caustic Soda Leach of Electric Arc Furnace Dust

tic soda leach process has the advantage that iron is not soluble in caustic soda. Therefore, leaching with caustic soda is the most promising method of the leaching processes. 1. Hydrometallurgical Recovery of Zinc From Eaf Dust In these processes, the metals are extracted by a liquid leach stage, and then recovered in metallic form by electrolysis.

  • Published in: Turkish Journal of Engineering and Environmental Sciences · 1999Authors: Hasan Mordoğan · Tayfun Cicek · Ayhan IşikAbout: Electric arc furnace · Zinc[PDF]Get Price

Pressure Leaching of EAF Dust with Sulphuric Acid

pilot plant based on caustic leaching, on the purification of solution by zinc dust and on electrowinning. This develop-ment was abandoned due to both technical and economic problems. A similar plant [2, 3], based on caustic leaching and known as the Cebedau process, was later built in France. The steelmaking dust containing 21.2 % of Zn and

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THE ALKALINE SULFIDE HYDROMETALLURGICAL SEPARATION ...

Dissolution of elemental sulfur in sodium hydroxide is also used as a lixiviant for alkaline sulfide leaching of arsenic. The combination of sodium hydroxide and elemental sulfur results in the formation of species other than just sulfide (S-2). Both

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(PDF) The kinetics of zinc silicate leaching in sodium ...

However, with the development of the acid leaching (AL)– caustic soda, and diethylene-triammine) showed that hemi-morphite solvent extraction (SX)–electrowinning (EW) process, non-sulphide could be leached with caustic soda at high temperature (85 °C). zinc deposits now account for about 10% of world metallic zinc Ammonium carbonate enhanced the leaching of hemi-morphite but production.

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DECHLORINATION OF ZINC OXIDE DUST DERIVED FROM .

leaching process, large amounts of leach residues are generated as insoluble substances that form a layer on the zinc surface during the acid leaching process, resulting in wastage of large amounts of valuable metals. Zinc oxide dust is presently obtained from zinc leach residue in a volatile revolving kiln, which contains significant amounts of Zn.

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Will caustic soda harm leach fields? - Bio Septic

When it comes to your leach field and will caustic soda harm leach fields? Caustic soda is not harmful at all. This is because when it comes in contact with acids like hydrochloric acid (commonly found in septic systems when you use strong acids in cleaning your home), salt and water are produced.

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Lead and zinc selective precipitation from leach electric ...

Thus, EAF dust has a great potential to be used as a source of metals extraction due to its rich chemical composition and also for the viability of the proposed selective separation process. Keywords: Electric arc furnace dust, zinc, lead, leaching.

  • Published in: Materia-rio De Janeiro · 2007Authors: Denise Maria Lenz · F B MartinsAffiliation: Universidade Luterana Do BrasilAbout: Electric arc furnace · ZincGet Price

Caustic Roasting and Leaching of Electric Arc Furnace Dust ...

It was found that the zinc ferrite (ZnFe2O4) in the dust was converted into sodium zincate (Na2ZnO2) and iron oxide (Fe2O3). In the subsequent dilute caustic leaching process both the zincite (ZnO) and the sodium zincate were soluble and the hematite was relatively insoluble.

Remove Copper from Moly by Ferric Chloride Leaching

Final leached product is packaged in either 1360 kg (3,000 lb.) bulk containers or 208 L (55 gallon) drums. Dust control in this area is provided by a 1.23 m³/s (2600 acfm) Mikropul dust collector. Solution Regeneration. Approximately 20 percent of the ferric chloride in the leach solution is reduced to ferrous chloride in the leaching process.

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Alkaline leaching of zinc from electric arc furnace steel dust

In the case of the present study, microwave radiation was used as a treatment stage prior to conventional caustic leaching. The EAF dust sample, placed inside a ceramic crucible, was heated in a microwave oven (1 kW) for about 2 min, achieving temperatures in the range of 600–700 °C.

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Chemical cleaning of coal by molten caustic leaching after ...

Abstract. Pretreatment of coal by devolatization at temperatures ranging from about 420.degree. C. to about 450.degree. C. for from about 10 minutes to about 30 minutes before leaching with molten caustic leads to a significant reduction in carbonate formation, greatly reducing the .

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Core Removal Process Using Caustic Leaching

June 2014 – An Investigation of the Core Removal Process Using Caustic Leaching The caustic leaching of ceramic cores involves a wide range of physics and chemistry concepts. Key aspects to the process have been illustrated here.

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CN101760757B - Method for producing lead by executing ...

The lead sulfate alkaline leaching and the lead electrolysis are carried out simultaneously in a same device, thereby regenerating solvent sodium hydroxide, simplifying the working procedures, reinforcing the dissolving process of the lead-bearing material, and widening the application range of the method on the lead-bearing material.

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Gold cyanidation - Wikipedia

Lead nitrate can improve gold leaching speed and quantity recovered, particularly in processing partially oxidized ores. Effect of dissolved oxygen. Oxygen is one of the reagents consumed during cyanidation, and a deficiency in dissolved oxygen slows leaching rate. Air or pure oxygen gas can be purged through the pulp to maximize the dissolved oxygen concentration.

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Study of Zinc Leaching of EAF Flue Dust Using Sodium .

purification of zinc, whereas sodium hydroxide selectively removes zinc at low concentrations thus avoiding need of electrowinning [3]. In this paper, hydrometallurgical technique using alkaline leaching from an EAF dust is investigated, aiming at maximum recovery of zinc. Sodium hydroxide was chosen as leaching agent as

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HYDRO - dl.uctm.edu

Hydrometallurgical treatment of flue dust is actually caustic leaching and it aims to remove the sulfate sulfur. The desulfation degree of the converter flue dust, using 35 g NaOH per 100 g dust, is 80 % and the total impurities concentra-tion in the Na 2 SO 4 solution is below 50 mg l-1.

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