Effect of humidity on nitric acid uptake to mineral dust ...

2020-7-31 · Effect of humidity on nitric acid uptake to mineral dust aerosol particles A. Vlasenko1,3, S. Sjogren2, E. Weingartner 2, K. Stemmler1, H. W. G aggeler¨ 1,3, and M. 1 1Laboratory of Radio- and Environmental chemistry, Paul Scherrer Institute, Villigen, Switzerland 2Laboratory of Atmospheric Chemistry, Paul Scherrer Institute, Villigen ...

Kinetics and statistical analysis of nickel leaching from ...

2016-3-10 · In this study, the kinetics of nitric acid leaching of a spent NiO–Al2O3 catalyst was investigated. The effect of leaching parameters such as reaction time (30–120 min), temperature (25–65 °C), stirring speed (500–1300 min − 1) and average particle size (63–300 μm) on Ni extraction were determined by statistical analysis. The results obtained show that extraction of …

Nitric Acid Manufacturing Process

2020-9-20 · Nitric Acid Manufacturing Process. Nitric Acid is a highly corrosive mineral acid. It is colorless in appearance similar to water but older samples happen to acquire a yellow color of different shades depending on its decomposition into oxides of nitrogen inside water or due to dissolution of nitrogen dioxide in to the water. Nitric acid is ...

Modeling and optimization of galena dissolution in a ...

2020-4-1 · The hydrometallurgical route involves leaching of the mineral and solvent extraction as essential operational units (Baba and Adekola, 2010). However, a high oxidation potential is required for the leaching of sulphide minerals (Aydogan, 2007). This challenge can be overcome by leaching with a highly oxidative acid such as nitric acid.

Investigating of Nitric Acid Leaching of High-Sulfur ...

This article describes the problems of deterioration of the quality of processed raw materials due to depletion of mineral resources. It is proposed to use nitric acid for the processing of complex refractory low-grade concentrates containing non-ferrous and noble metals. It was found that the studied concentrate contains: sphalerite (26.9 %), pyrite (22.0 %), chalcopyrite (19.9 %), silica …

(PDF) Process development to recover rare earth metals ...

2021-12-10 · Abreu and Morais in 2010 reported the development of an. efficient and relatively simple process to obtain high grade CeO. 2. from sulfuric …

What Chemicals Are Used to Passivate and Why?

2020-8-19 · Nitric Acid. Nitric acid is a highly corrosive mineral acid used in a wide variety of industries and applications and has been in use in some form or another since the 9 th century. When ASTM A-380 was first published in July of 1978, nitric acid was the prescribed chemical accepted in passivating stainless steel.

(PDF) Investigating of Nitric Acid Leaching of High-Sulfur ...

This article describes the problems of deterioration of the quality of processed raw materials due to depletion of mineral resources. It is proposed to use nitric acid for the processing of ...

(PDF) Nitric acid in the hydrometallurgy of sulfides

Nitric acid Manufacturing Process | Uses | Ostwald Process

NITRIC ACID SAFETY

NITRIC ACID SAFETY . Nitric acid is a highly corrosive mineral acid and strong oxidizer used primarily for nitration of organic molecules an d washing glassware or metal equipment. Nitric acid reacts violently with alcohols, alkalis, reducing agents, combustible materials, organic materials, metals, acids, cyanides, terpenes, charcoal, and acetone.

Chemical and physical transformations of aluminosilicate ...

Mineral dust aerosol is one of the largest contributors to global ice nuclei, but physical and chemical processing of dust during atmospheric transport can alter its ice nucleation activity. In particular, several recent studies have noted that sulfuric and nitric acids inhibit heterogeneous ice …

High concentration of nitric acid | De Dietrich Process ...

Process Nitric acid forms an azeotrop with water at about 68wt% of nitric acid and a boiling point at atmospheric pressure of 122°C. In order to overcome an aqueuos azeotop concentrated highly hydroscopic sulfuric acid is an ideal option as …

CHAPTER 13 WET DIGESTION METHODS

2005-8-25 · Physical properties of common mineral acids and oxidizing agents used for wet digestion Compound Formula Molecular Concentration weight w/w Molarity (%) Density (kg l-1) Boiling point (oC) Comments Nitric acid HNO3 63.01 68 16 1.42 122 68% HNO3, azeotrope Hydrochloric acid HCl 36.46 36 12 1.19 110 20.4% HCl, azeotrope

Study of the reaction between dolomite and nitric acid

2019-1-23 · dolomite grains are fluidized and surrounded by nitric acid for the whole reaction time. Similar behaviour was published in many papers dealing with the dolomite dissolution in mineral acids (Vyborny and Madron, 1989; Özbek et al., 1999; Yildirim, 2008). 3.2 Effect of temperature and nitric acid concentration

Nitric Acid Market | 2021

Nitric acid is a colorless, highly corrosive mineral acid with the chemical formula HNO3. It can be produced through a two-step process including oxidation of ammonia and then after, absorption of produced nitrogen oxides. Nitric acid finds its major application in the fertilizer industry.

Nitric Acid Treatment | De Dietrich Process Systems

Introduction. Nitric acid is one of the most common mineral acids in the chemical Industry. It is produced by a high temperature oxidation of ammonia with oxygen catalyzed by a platinum/rhodium contact providing with water nitric acid with a …

Nitric Acid, HNO3

2020-4-6 · Fig: Manufacture of nitric acid. Ostwald''s Process (Modern Process) Principle: The mixture of ammonia and air when passed over platinum gauze catalyst at 750-900°C, the ammonia is oxidised to nitric oxide (NO), 4NH 3 + 5O 2 4NO + 6H 2 O + 21,600 calories The reaction is exothermic and the heat of reaction maintains the temperature of the catalyst.

Nickel and the Three Mineral Acids 2012-05-11a

2020-3-27 · Hydrometallurgical processing of laterite begins with an acid leach of some kind. The dominant acid so far has been sulphuric acid, but work has been published on processes using hydrochloric acid or nitric acid.(3,5) Sulphuric acid, hydrochloric acid and nitric acid being the three major mineral

Hydrometallurgical Processing of a Nigerian Galena Ore …

2018-12-22 · Galena, Nigeria, Characterization, Leaching, Dissolution Kinetics, Nitric Acid How to cite this paper: Nnanwube, I.A. and Onukwuli, O.D. (2018) Hydrometal-lurgical Processing of a Nigerian Galena Ore in Nitric Acid: Characterization and Dissolution Kinetics. Journal of Minerals and Materials Characterization and Engi-neering, 6, 271-293.

Nitric Acid NZ Suppliers & Bulk Distributors

NITREX is a mixture of nitric acid and phosphoric acid formulated to be used in metal brightening and mineral deposit removal. It can also be used for cleaning in place (CIP) of high temperature food processing equipment including pasteurisers, evaporators and driers.

Acid Washing – Denver Mineral Engineers

Acid washing has proven to be a very cost-effective means of maintaining the activity of activated carbon. During operation, carbon will typically become fouled due to an accumulation of precipitated mineral salts. This reduces the carbon …

Nitric acid Manufacturing Process | Uses | Ostwald Process

Nitric acid manufacturing process is started from ammonia and oxygen gas in ostwald process. Potassium nitrate and sulfuric gas can be used to produce nitric gas in laboratory scale. Nitric acid is used to manufacture explosives, some …

Action of Nitric Acid on Metals

Nitric acid has no action on gold, platinum, iridium, tantalum, rhodium, and titanium. All other metals are attacked by the acid, often with the formation of nitrates, and reduction products of the nitric acid, which vary with the temperature and concentration of the acid.

Evaluation of Acid Digestion Procedures to Estimate ...

Mineral analyses have been performed using as a digesting solution nitric and perchloric acid in a ratio ranging from 2:1 to 4:1 v/v and with two digestion steps (AOAC, 2000; Detmann et al., 2012). Standardizing the ratio of acids used in the digestion of samples could increase the reliability of either information or comparison of results ...

The Ammonia Oxidation Process for Nitric Acid …

2021-12-8 · It is little more than fifty years since the first manufacture of nitric acid by the oxidation of ammonia over a platinum catalyst. Ostwald''s original industrial plant had an output of some 100 tons of acid a year; today the world capacity …

AP42 8.8 Nitric Acid Production

2015-9-10 · nitrations. Nitric acid nitrations are used in producing nitrobenzene, dinitrotoluenes, and other chemical intermediates. 1 Other end uses of nitric acid are gold and silver separation, military munitions, steel and brass pickling, photoengraving, and acidulation of phosphate rock. 8.8.2 Process Description 1,3-4 Nitric acid is produced by 2 ...

Safe Handling of Mineral Acids | Protocol

Additionally, mineral acids such as nitric acid and sulfuric acid are strong oxidizing agents and can react violently causing explosions. This video will illustrate the hazardous nature of mineral acids, how to safely handle, dispose, and store these chemicals; and what to do in case of an emergency, like skin contact or spill.

Deoxidizing Aluminum as a Pretreatment

2018-6-1 · Nitric and sulfuric solutions are usually interchangeable or paired, so I will only discuss nitric-based deoxidizers, which are more common, and chromic-acid based ones. Nitric acid is the more common choice for non-etching …

Washing Activated Carbon

2016-6-7 · In the process of washing activated carbon, a dilute hydrochloric acid solution (3%) is circulated/pumped into the elution column. The acid dissolves inorganic foulants such as calcium carbonate, magnesium and sodium salts, …

Evaluation of Decalcification Techniques for Rat Femurs ...

Four different decalcification solutions were employed to remove the mineral substances from rat femurs, including 10% neutral buffered EDTA, 3% nitric acid, 5% nitric acid, and 8% hydrochloric acid/formic acid. Shaking and low temperature were used to process the samples. The stainings of hematoxylin-eosin (HE) and immunohistochemical (IHC ...