Study of Sulphatizing Roasting Process Using Iron Sulphates for the Treatment of Zinc Leach Residue

2020 ◽  
Vol 989 ◽  
pp. 448-455
Author(s):  
Pavel Grudinsky ◽  
Ekaterina Podjelnikova ◽  
Valery Dyubanov
Keyword(s):  
High Efficiency ◽  
Water Soluble ◽  
Leach Residue ◽  
Water Leaching ◽  
Zinc Plant ◽  
Roasting Process ◽  
Temperature Ranges ◽  
Iron Sulphate ◽  
Iron Sulphates ◽  
Soluble Sulphate

The paper presents the results of the investigation of zinc leach residue (ZLR) processing by sulphatizing roasting with iron sulphates FeSO4 and Fe2(SO4)3 followed by water leaching. The elemental and phase compositions of ZLR of JSC "Chelyabinsk Zinc Plant" were studied. Based on the thermodynamic calculations using HSC Chemistry 9.9 software, the temperature ranges of the sulphatizing roasting and the required amounts of iron sulphate additives for the sulphation of zinc and copper were determined. Subsequent experiments showed that recovery rates of zinc and copper reached 99.5% and 89.1% respectively, while iron remained in the leached residue. The results have indicated a high efficiency of sulphatizing roasting to transform zinc and copper contained in ZLR from ferrite to water-soluble sulphate.

scholarly journals Comprehensive Study on the Mechanism of Sulfating Roasting of Zinc Plant Residue with Iron Sulfates

Materials ◽  
2021 ◽  
Vol 14 (17) ◽  
pp. 5020
Author(s):  
Pavel Grudinsky ◽  
Denis Pankratov ◽  
Dmitry Kovalev ◽  
Darya Grigoreva ◽  
Valery Dyubanov
Keyword(s):  
Xrd Analysis ◽  
Water Soluble ◽  
Plant Residue ◽  
Effect Of Temperature ◽  
Soluble Form ◽  
Water Leaching ◽  
Time Resolved ◽  
Zinc Plant ◽  
Sulfating Roasting ◽  
Sulfation Roasting

Zinc plant residue (ZPR) is a secondary material generated during hydrometallurgical zinc production that contains considerable contents of valuable elements such as Zn, Cu, Fe, Pb, Cd, Ag, In, Ga, Tl. Zinc, copper and accompanying elements in ZPR are in different minerals, mainly in the ferrites. A promising approach for recycling ZPR is the sulfating roasting using iron sulfates followed by water leaching. In this study, the composition of ZPR and the obtained products were thoroughly investigated by various methods including X-ray diffraction analysis (XRD), chemical phase analysis and Mössbauer spectroscopy. The effect of temperature, amount of iron sulfates and roasting time on the conversion of valuable metals into a water-soluble form was thermodynamically and experimentally studied both using pure ferrites and ZPR. Based on the results of time-resolved XRD analysis and synchronous thermal analysis (STA), a mechanism of the sulfation roasting was elucidated. The rate-controlling step of zinc and copper sulfation process during the ZPR roasting was estimated. The sulfating roasting at 600 °C during 180 min with the optimal Fe2(SO4)3∙9H2O addition followed by water leaching enables to recover 99% Zn and 80.3% Cu, while Fe, Pb, Ag, In, Ga retained almost fully in the residue.

Sequential extraction of vanadium and chromium from chromium-bearing vanadium slag through two-stage soda roasting-water leaching

2018 ◽  
Vol 115 (6) ◽  
pp. 607
Author(s):  
Helin Fan ◽  
Huamei Duan ◽  
Wenjie He ◽  
Dengfu Chen ◽  
Tao Liu ◽  
...  
Keyword(s):  
Sequential Extraction ◽  
Extraction Process ◽  
Water Soluble ◽  
Leaching Rate ◽  
Vanadium Slag ◽  
X Ray Diffraction ◽  
Water Leaching ◽  
Two Stage ◽  
Experimental Conditions ◽  
Roasting Process

The sequential extraction of vanadium and chromium from the chromium-bearing vanadium slag through two-stage soda roasting-water leaching was proposed. The precipitation order and thermodynamic stability of Cr-spinel and V-spinel were thoroughly calculated with FactSage 6.3 software. The mechanism of the sequential extraction process is further determined by X-ray diffraction (XRD). Thermodynamic calculations show that the precipitation order of main phases in the chromium-bearing vanadium slag is as follows: Cr-spinel → V-spinel → Fe-olivine, while the priority of the reaction between main phases with Na2CO3 follows the order of Fe-olivine → V-spinel → Cr-spinel. XRD results reveal that the vanadium-bearing phase in roasted slag is water-soluble NaVO3, while the chromium-bearing phase in roasted slag is Cr-spinel ((Mn, Fe) Cr2O4) and solid solutions ((Fe0.6Cr0.4)2 O3) with the soda amount of 21% and temperature of 800 °C. The different evolution route of vanadium-bearing phase and chromium-bearing phase during the roasting process ensures preferential extraction of vanadium from the chromium-bearing vanadium slag. The leaching rates of vanadium and chromium reach 89.36% and 4.91% with optimized experimental conditions. The high leaching rate of vanadium and low leaching rate of chromium show good results of preferential extraction of vanadium from the chromium-bearing vanadium slag.

scholarly journals Creation of New Analogues of Natural Phytogormons for Increasing the Yield of Agricultural Crops

2018 ◽  
Vol 7 (3.32) ◽  
pp. 59
Author(s):  
Zhylkybaev Oral ◽  
Alimzhanova Mereke ◽  
Ashimuly Kazhybek ◽  
Shoinbekova Sabina ◽  
Tukenova Zulfia
Keyword(s):  
Biological Activity ◽  
Growth Regulator ◽  
High Efficiency ◽  
Field Tests ◽  
Dry Mass ◽  
Water Soluble ◽  
High Yield ◽  
Small Scale ◽  
Wide Range ◽  
Reference Preparation

Synthesis of new potential plant growth regulators (analogues of natural phytohormones) is accomplished by mixing an equimolar mixture of aryloxypropin and 1-methylpiperidin-4-one under the conditions of Favorsky's reactions. New derivatives of acetylene aminoalcohols - the ZhOT series - have been obtained. The structure of the synthesized compounds was established by IR and NMR 1H spectroscopy. Screening of their water-soluble forms, on wheat and barley seeds, two preparations (ZhOT-4 and ZhOT-7) were selected, which exceed both the control and standards of known phytohormones, such as heteroauxin (indolyl-3-acetic acid), 6-BAP (6-benzylaminopurine) for further testing. Conducted in-depth laboratory and demonstration field tests on cereals (wheat and barley) showed high efficiency of ZhOT-4 and ZhOT-7, the indicators of which exceeded the well-known reference preparation - Agrostimulin (Ukraine). The growth regulating activity of synthesized compounds was determined. Processing of wheat seeds ZhOT-4 and ZhOT-7 increased the field germination of seeds, plant height, leaf area, the mass of the aerial part and the total area. The conducted studies showed that the biological activity of the tested compounds largely depends on the concentration and the best growth regulator is ZhOT-4. The activity of the synthesized growth regulatory compounds has been determined. Treatment of seeds of with ZhOT-4 and ZhOT-7 increased seed germination, height of plants, leave areas, weight of an elevated part and the total area, weight of an elevated part and the total area. Studies have shown that the biological activity of tested compounds is largely dependent on the concentration and the best growth regulator is ZhОТ-4. Thus, the advanced laboratory and demonstration (small-scale) comparative tests of ZhOT-4 and ZhOT-7 and the well-known reference preparation "Agrostimulin" (Ukraine) for cereals (wheat and barley) showed high efficiency of new synthesized preparations. The use of ZhOT preparations increases the germination and germination energy, the number of spikelets, the mass of grains, the bushiness and the yield of wheat and barley, leads to the accumulation of dry mass in both the ground and underground parts of plants. The advantages of ZhOT-4 and ZhOT-7 are: high efficiency, a wide range of cultures, good solubility in water, low application dose of 0.0001% by active ingredient (1g per 1t of water) or 13-50 mg per hectare, comparable to natural phytohormones, long shelf life, safety, high yield of target products, sequential 3-stage reaction in one reactor. 

Production of Amino and Organic Acids from Protein Using Sub-Critical Water Technology

2013 ◽  
Vol 11 (1) ◽  
pp. 369-384 ◽  
Author(s):  
Wael Abdelmoez ◽  
Hiroyuki Yoshida
Keyword(s):  
Organic Acids ◽  
Gas Phase ◽  
Solid Phase ◽  
Water Soluble ◽  
Water Soluble Protein ◽  
Study Results ◽  
Temperature Ranges ◽  
Aggregation Step ◽  
Hydrolysis Of ◽  
Protein Bovine Serum Albumin

Abstract This work presents the hydrolysis of a water-soluble protein, bovine serum albumin (BSA), for the production of both amino and organic acids under the sub-critical water condition in the temperature range of 200–300°C. The products of the reaction were a water-insoluble solid phase, an aqueous phase, and an insignificant gas phase which was neglected in this study. Results have shown that BSA passes through an aggregation step, followed by a gel formation process which results in the formation of insoluble solid aggregates. Then, such formed solids unfolded with releasing polypeptides as an intermediate product then finally hydrolyzed to produce low molecular mass products such as amino and organic acids. It was found that there were insignificant amino acids produced in the temperature ranges of 200–225°C within 2 min and 275–300°C within 0.5 min. However, by extending the reaction time, the protein transferred to both amino and organic acids.

Effective Extraction of Vanadium and Chromium from High Chromium Content Vanadium Slag by Sodium Roasting and Water Leaching

2016 ◽  
Vol 863 ◽  
pp. 144-148 ◽  
Author(s):  
Ming Li ◽  
Liang Xiao ◽  
Jing Jing Liu ◽  
Zhi Xin Shi ◽  
Zi Bi Fu ◽  
...  
Keyword(s):  
Chromium Content ◽  
Leaching Rate ◽  
Vanadium Slag ◽  
Water Leaching ◽  
Sodium Salts ◽  
High Chromium ◽  
Effective Factor ◽  
Roasting Process ◽  
Roasting Temperature ◽  
Roasting Time

The extraction of vanadium and chromium from high chromium content vanadium slag by salt roasting and water leaching process has been investigated, which uses mixed sodium salts (Na2CO3 and NaOH) as additive agent in roasting process. The mineralogical morphology was prospected by TG-DSC, XRD, SEM and EDS. The oxidation of slag and transversion of V/Cr-containing phase and sodium salts have been discussed. It has been demonstrated that the presence of NaOH contributes to decompose spinel and olivine phases, which is beneficial to reduce the roasting temperature and elevate V, Cr leaching ratio. The roasting parameters have been studied as a function of roasting temperature, roasting time and ratio of alkali, in which the roasting temperature is the most effective factor on the leaching rate of vanadium and chromium. Under the optimum condition, the leaching rates of V and Cr reached 95.8% and 97.6%, respectively.

scholarly journals Formation of Chromium-Containing Molten Salt Phase during Roasting of Chromite Ore with Sodium and Potassium Hydroxides

2016 ◽  
Vol 16 (4) ◽  
pp. 215-225 ◽  
Author(s):  
Lidia Escudero-Castejon ◽  
Sergio Sanchez-Segado ◽  
Stephen Parirenyatwa ◽  
Animesh Jha
Keyword(s):  
Molten Salt ◽  
Extraction Yield ◽  
Water Soluble ◽  
Sodium Chromate ◽  
Water Leaching ◽  
Chromite Ore ◽  
Wide Range ◽  
Salt Phase ◽  
Sodium And Potassium ◽  
Equilibrium Calculations

AbstractChromium has a wide range of applications including metals and alloys manufacturing, pigments, corrosion resistance coatings and leather tanning. The production of chromium chemicals is based on the oxidative alkali roasting of chromite ores, which leads to the formation of water-soluble alkali chromates. Previous investigations reported that when chromite is roasted with soda-ash, a molten salt containing chromium, which is mainly composed of sodium carbonate and sodium chromate (Na2CO3-Na2CrO4 binary mixture), forms under typical roasting conditions. The physical properties of the liquid phase, which are dependent on the temperature, charge and gangue compositions, play an important role on the oxidation reaction and may limit the chromate recovery by hindering the oxygen transport to the reaction interface. This investigation focuses on the alkali roasting of chromite ore at 1,000 oC using NaOH and KOH, followed by water leaching. The influence of the alkali ratio on the chromium extraction yield is analysed, and the results obtained with both hydroxides are compared. Sample characterisation and thermodynamic analysis, including phase diagrams, equilibrium calculations and computation of liquidus curves, are combined with the purpose of studying the formation of the molten salt phase under different roasting conditions and its effect on the final chromium recovery.

scholarly journals MECHANOCHEMICAL MODIFICATION OF TRIKLABENDAZOL TO OBTAIN AN EFFECTIVE DRUG AGAINST FACTIOLESIS

2019 ◽  
pp. 656-662
Author(s):  
Khalikov ◽  
Musaev
Keyword(s):  
High Efficiency ◽  
Siberian Larch ◽  
Water Soluble ◽  
Spectral Studies ◽  
Water Soluble Polymers ◽  
Soluble Polymers ◽  
Intermolecular Complexes ◽  
Mechanochemical Modification ◽  
Flowing Powder ◽  
Effective Drugs

To study the possibility of increasing the solubility of the substance triclabendazole (TCB), we used the technology of mechanochemical modification of TCB using water-soluble polymers, polyvinylpyrrolidone (PVP) and arabinogalactan (AG) from Siberian larch Larix sibirica in particular. After joint machining of TCB with polymers (PVP, AG) in a LE-101 ball mill (made in Hungary), free flowing powder dispersions with an increased solubility (more than 50 times as compared to the original substance TCB) were obtained. This result was explained by the formation of intermolecular complexes of the type of hydrogen bond between the characteristic groups of TCB and polymers, which was confirmed by the data of IR-spectral studies. Tests of intermolecular complexes on spontaneously fasciola-infected sheep have shown high efficiency. As a result of the research, it was found that the complex of TCB: AG composition (1:9), which we named “triclafascid”, possesses a number of positive attributes in comparison with the substance of TCB and provides high fasciolocid and economic efficacy, and safety of use by reducing the therapeutic dose. Inclusion of arabinogalactan, which has hepatoprotective, antimutagenic, mitogenic, gastroprotective properties, in the preparation, made it possible to reduce the toxicity of the preparation proposed for practice. It was shown that residual amounts of TCB and its metabolites were not detected in tissues and organs on the 14th day of the experiment with triclafascid, which indicates the possibility of slaughtering an animal and using meat 14 days after using the drug. The drug has good solubility, bioavailability to helminthes, is non-toxic, and increases antihelminthic and economic efficiency. The obtained results confirmed the previously obtained data on the prospects of an innovative approach to improve the quality indicators of anthelmintic drugs and to obtain effective drugs for veterinary medicine.

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