Phosphorus Extraction from Sludge Incinerated Bottom Ash with Hydrochloric Acid at Low Liquid-Solid Ratio

2021 ◽  
Author(s):  
He Hong ◽  
Ying Chen ◽  
Min Liu ◽  
Lingfang Xu
Keyword(s):  
Hydrochloric Acid ◽  
Bottom Ash ◽  
Solid Ratio ◽  
Phosphorus Extraction

Experimental Study on Concentrating Scandium by Leaching from Associated Scandium Ore

2013 ◽  
Vol 734-737 ◽  
pp. 1033-1036
Author(s):  
Gui Fang Zhang ◽  
Peng Yan ◽  
Qing Rong Yang
Keyword(s):  
Experimental Study ◽  
Particle Size ◽  
Hydrochloric Acid ◽  
Acid Concentration ◽  
Hydrochloric Acid Concentration ◽  
Leaching Rate ◽  
Optimal Conditions ◽  
Research Results ◽  
Solid Ratio ◽  
Leaching Residue

Based on the benefication of the complex silicate ore containing scandium, the research about aid-leaching agent used in the leaching of the scandium concentrate was been conducted. And the suitable leaching agent and aid-leaching agent which the useful ions entered into leaching liquid and the harmful ions were kept in leaching residue were been found according to the experiment results. For the scandium of sample existed various complex silicate ore as isomorphism form, the research has adopted hydrochloric acid with aid-leaching agent to dissociate the silicate ore and make scandium entering into solution. The research results has shown that the scandium leaching rate could reach 92.06% under the optimal conditions which the hydrochloric acid concentration is 22.8%, the dosage of aid leaching agent is 6%, liquid solid ratio is 4:1, particle size of leaching material totally is less than 0.15mm and leaching time is 8h.

scholarly journals Recovery of Tantalum and Manganese from Epoxy-Coated Solid Electrolyte Tantalum Capacitors through Selective Leaching and Chlorination Processes

Materials ◽  
2022 ◽  
Vol 15 (2) ◽  
pp. 656
Author(s):  
Wei-Sheng Chen ◽  
Chih-Yuan Hsiao ◽  
Cheng-Han Lee
Keyword(s):  
Reaction Time ◽  
Hydrochloric Acid ◽  
Solid Electrolyte ◽  
Epoxy Resin ◽  
Selective Leaching ◽  
Ferrous Chloride ◽  
Electronic Products ◽  
Solid Ratio ◽  
Chlorination Process ◽  
Acid Type

Electronic products are ever growing in popularity, and tantalum capacitors are heavily used in small electronic products. Spent epoxy-coated solid electrolyte tantalum capacitors, containing about 22 wt.% of tantalum and 8 wt.% of manganese, were treated with selective leaching by hydrochloric acid and chlorination after removing the epoxy resin, and the products converted, respectively, to Mn(OH)2 and TaCl5. The effects of acid type, acid concentration, liquid–solid ratio, and reaction time were investigated to dissolve the manganese. The optimal selective leaching conditions were determined as 3 mol/L of HCl, 40 mL/g at 25 °C for 32 min. Next, residues of selective leaching after washing and drying were heated with ferrous chloride to convert to pure TaCl5. Mixing 48 wt.% of chloride and 52 wt.% of residues for a total of 5 g was conducted to complete the chlorination process in the tube furnace at 450 °C for 3 h. A total of 2.35 g of Ta was collected and the recovery of Ta achieved 94%. Finally, Mn(OH)2 and TaCl5 were separated and purified as the products.

Technical Basis for Codisposal of Gasification and Combustion Ash from the Plants at Beulah, North Dakota

1985 ◽  
Vol 65 ◽  
Author(s):  
G. J. McCarthy ◽  
D. J. Hassett ◽  
O. E. Manz ◽  
G. H. Groenewold ◽  
R. J. Stevenson ◽  
...  
Keyword(s):  
North Dakota ◽  
Great Plains ◽  
Tap Water ◽  
Day Treatment ◽  
Bottom Ash ◽  
Weighted Average ◽  
Reaction Products ◽  
Mineralogical Characterization ◽  
Curing Conditions ◽  
Solid Ratio

ABSTRACTThe technical hasis for codisposal of gasification ash from the Great Plains Gasification Associates plant, combined with cementitious “scrubber ash” and bottom ash from the adjoining Antelope Valley generating station, both located in Beulah, North Dakota, has been explored. Nine blends containing only the ashes and tap water were fabricated into cylinders and tested for compressive strength and other physical properties. A blend having the ash proportions of the two plants was tested for leachability with respect to several regulated and minor elements. Mineralogical characterization by XRD was performed on the individual waste solids and the cured mixes. Most of the blends had compressive strengths greater than 400 psi after 7-day/38 C and 28-day/21 C curing. The 7-day treatment led to better consolidated test cylinders. Leaching behavior, evaluated by the EPA-EP and ASTM tests, was determined for As, Se, B, V, Mo, Ba, Sr, and K. Average fixation factors (the ratio of leaching expected from a weighted average of its components to the actual leaching of the specimen) of 2 to 4 were observed for the 7-day cured specimens and 1 to 2 for the 28-day specimens. Not all elements had reduced leaching in the fabricated specimens; Se and V leaching increased in the fabricated specimens. In addition to ash proportions, curing conditions (T, pH2O, time) and water to solid ratio appear to key parameters in obtaining well-consolidated and lower leachability products. XRD indicated that ettringite and minor calcite were the only crystalline reaction products of the cementitious reactions in the cured codisposal mix.

Effect of Spinning Process on the Absorption Performance of Wooden Activated Carbon Fiber for Methylene Blue

2013 ◽  
Vol 469 ◽  
pp. 117-120 ◽  
Author(s):  
Fan Zhang ◽  
Xiao Jun Ma
Keyword(s):  
Methylene Blue ◽  
Activated Carbon ◽  
Hydrochloric Acid ◽  
Acid Concentration ◽  
Absorption Capacity ◽  
Activated Carbon Fiber ◽  
Hydrochloric Acid Concentration ◽  
Solid Ratio ◽  
Spinning Process ◽  
Absorption Performance

In order to improve the adsorption performance of wooden activated carbon fibers (WACFs) and enlarge its application in food safety and fresh, the charcoal dust is used as pore-forming agent, and the absorption performance of WACFs for methylene blue (MB) by changing the liquid-solid rate, charcoal content, synthetics content and hydrochloric acid concentration is studied. The results show that: with the increase of liquid-solid ratio, the absorption capacity of WACFs for MB increases accordingly; with the increase of charcoal content and synthetics content, the absorption capacity both show the tendency of increasing first then reducing after accordingly, with the maximum absorption capacities of 534.61mg·g-1and 527.25mg·g-1respectively reached by 1% charcoal content and 4% synthetic content. When the hydrochloric acid concentration was below 15%, the absorption capacity increases linearly, while reduced when hydrochloric acid concentration was over 15%.

scholarly journals Leaching of lead from sphalerite concentrate direct leaching residue by hydrochloric acid and sodium chloride for preparation of lead oxides

2020 ◽  
Vol 56 (2) ◽  
pp. 247-255
Author(s):  
Y.-Y. Fan ◽  
Y. Liu ◽  
L.-P. Niu ◽  
T. Jing ◽  
T.-A. Zhang
Keyword(s):  
Sodium Chloride ◽  
Hydrochloric Acid ◽  
Chloride Concentration ◽  
Sodium Oxalate ◽  
Hydrochloric Acid Concentration ◽  
Solid Ratio ◽  
Oxide Powders ◽  
Optimum Parameters ◽  
Leaching Residue ◽  
Direct Leaching

The purpose of this study was to select and propose an applicable method for extracting lead from sphalerite concentrate direct leaching residue. A large number of experiments were conducted to extract lead from sphalerite concentrate direct leaching residue by hydrochloric acid and sodium chloride solution as leachates. The main optimum parameters were determined, such as a liquid-solid ratio of 17.5-1, a reaction temperature of 85?C, an initial hydrochloric acid concentration of 1.3 mol/L, an initial sodium chloride concentration of 300 g/L, and a reaction time of 60 min. Ninety-five percent of the zinc, 96.0% of the iron, and 93.7% of the lead were extracted into leachate at the optimum conditions. The lead in the leachate was in the form of [PbCl4]2-. After the leachate was purified to remove impurities, it was converted into lead oxalate by sodium oxalate as a precipitant. Finally, lead oxalate was decomposed to obtain lead oxide powders via a high-temperature calcination process.

Research on the Extract Al2O3 from Coal Gangue

2012 ◽  
Vol 524-527 ◽  
pp. 1947-1950 ◽  
Author(s):  
Lei Zhang ◽  
Hao Wang ◽  
Yu Li
Keyword(s):  
Hydrochloric Acid ◽  
Aluminum Oxide ◽  
Acid Concentration ◽  
Acid Leaching ◽  
Coal Gangue ◽  
Hydrochloric Acid Concentration ◽  
Leaching Rate ◽  
Mass Ratio ◽  
Sample Mass ◽  
Solid Ratio

The experiments selected Wang Taipu gangue as raw materials and adopted single factor experimental method to study the leaching of aluminum oxide from gangue by using hydrochloric acid as leaching medium. The experiments studied solvent/sample mass ratio, hydrochloric acid/sample, liquid-solid ratio, hydrochloric acid concentration, leaching time and leaching temperature on Al2O3 leaching rate of coal gangue. Through the parallel experiment of the above factors, we can found that optimization conditions of hydrochloric acid leaching of alumina were: solvent /sample mass ratio: 0.20, solvent: NaF, liquid-solid ratio: 1:10, hydrochloric acid concentration: 6mol/L, leaching time: 150min, leaching temperature:110°C. In this case, the aluminum oxide of optimal leaching rate was 79.33%.

scholarly journals Impact of Synthetic Parameters on the Compressive Strength of Bagasse Ash-Clay Geopolymer

Crystals ◽  
2021 ◽  
Vol 11 (8) ◽  
pp. 937
Author(s):  
Noorul Amin ◽  
Saeed Gul ◽  
Sabiha Sultana ◽  
Sultan Alam ◽  
Amir Naveed
Keyword(s):  
Compressive Strength ◽  
Sodium Hydroxide ◽  
Close Relationships ◽  
Bottom Ash ◽  
Alkali Concentration ◽  
Solid Ratio ◽  
Thermally Activated ◽  
Analytical Instruments ◽  
Curing Period ◽  
The Impact

The impact of different parameters on the compressive strength of geopolymer synthesized from clay and bagasse bottom ash is reported. Geopolymer was synthesized from thermally activated clay and bottom bagasse ash using sodium silicate and sodium hydroxide as activator. The maximum dissolution of alumina and silica from the bagasse ash and clay maintaining different alkali conditions is studied. The resulting geopolymer synthesized under different conditions is studied for compressive strength. Different characterizations of the resulting geopolymer were carried out using different analytical instruments. The results indicated that the dissolution and strength of geopolymer have close relationships with the alkali concentration, solution to solid ratio and curing period. The highest compressive strength of 25 MPa was observed for 8M NaOH, 24 MPa for 0.3 solution to solid ratio, 30 MPa for 60% clay and 30 MPa for 27 days of compressive strength.

Fine Structure of Platelet Interaction with a New Microcrystalline Collagen Preparation

1974 ◽  
Vol 32 ◽  
pp. 58-59
Author(s):  
W. H. Zucker ◽  
R. G. Mason
Keyword(s):  
Fine Structure ◽  
Platelet Aggregation ◽  
Hydrochloric Acid ◽  
Whole Blood ◽  
Platelet Adhesion ◽  
Hemostatic Agent ◽  
Native Collagen ◽  
Fibrillar Morphology ◽  
Clinical Interest ◽  
New Form

Platelet adhesion initiates platelet aggregation and is an important component of the hemostatic process. Since the development of a new form of collagen as a topical hemostatic agent is of both basic and clinical interest, an ultrastructural and hematologic study of the interaction of platelets with the microcrystalline collagen preparation was undertaken.In this study, whole blood anticoagulated with EDTA was used in order to inhibit aggregation and permit study of platelet adhesion to collagen as an isolated event. The microcrystalline collagen was prepared from bovine dermal corium; milling was with sharp blades. The preparation consists of partial hydrochloric acid amine collagen salts and retains much of the fibrillar morphology of native collagen.

Characterization of lead-bearing phases in municipal waste combustor fly ash

1996 ◽  
Vol 54 ◽  
pp. 516-517
Author(s):  
L. L. Sutter ◽  
G. R. Dewey ◽  
J. F. Sandell
Keyword(s):  
Fly Ash ◽  
Bottom Ash ◽  
Municipal Waste ◽  
Primary Concern ◽  
Leaching Behavior ◽  
Waste Combustion ◽  
Lead And Cadmium ◽  
Lead Speciation ◽  
Accepted Practice

Municipal waste combustion typically involves both energy recovery as well as volume reduction of municipal solid waste prior to landfilling. However, due to environmental concerns, municipal waste combustion (MWC) has not been a widely accepted practice. A primary concern is the leaching behavior of MWC ash when it is stored in a landfill. The ash consists of a finely divided fly ash fraction (10% by volume) and a coarser bottom ash (90% by volume). Typically, MWC fly ash fails tests used to evaluate leaching behavior due to high amounts of soluble lead and cadmium species. The focus of this study was to identify specific lead bearing phases in MWC fly ash. Detailed information regarding lead speciation is necessary to completely understand the leaching behavior of MWC ash.

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