scholarly journals Environmentally Friendly Plating Pretreatment for ABS Plastic Using Electrolyzed Sulfuric Acid

2018 ◽  
Vol 43 (6) ◽  
pp. 343-347
Author(s):  
Y. Nakabayashi ◽  
Y. Umeda ◽  
T. Nagai ◽  
K. Tashiro ◽  
H. Honma ◽  
...  
Keyword(s):  
Sulfuric Acid ◽  
Environmentally Friendly

ChemInform Abstract: An Environmentally Friendly Synthesis of 1,4-Dihydropyrano[2,3-c]pyrazole Derivatives Catalyzed by Tungstate Sulfuric Acid.

ChemInform ◽  
2015 ◽  
Vol 46 (19) ◽  
pp. no-no
Author(s):  
Mahnaz Farahi ◽  
Bahador Karami ◽  
Iman Sedighimehr ◽  
Hamideh Mohamadi Tanuraghaj
Keyword(s):  
Sulfuric Acid ◽  
Environmentally Friendly ◽  
Pyrazole Derivatives

scholarly journals Studies on zinc recovery from technogenic waste

2021 ◽  
Vol 295 ◽  
pp. 03008
Author(s):  
Marinela Panayotova ◽  
Vladko Panayotov
Keyword(s):  
Hydrogen Peroxide ◽  
Sulfuric Acid ◽  
Laboratory Experiments ◽  
Environmentally Friendly ◽  
Leach Solution ◽  
Secondary Source ◽  
Atmospheric Conditions ◽  
Zinc Recovery ◽  
Technogenic Waste ◽  
Lead Zinc

Results from laboratory experiments are presented on extraction of zinc available in waste from lead-zinc metallurgy, mixed with lead-zinc flotation tailings and some waste rock, by leaching it under atmospheric conditions with sulfuric acid (H2SO4) solutions (5 and 10 wt. %) and 30 % hydrogen peroxide in the temperature range of 25 - 80 °C, at leaching time 30 - 120 min. Material leaching with 10 % H2SO4 solution at 70 °C for one hour brings into pregnant leach solution (PLS) around 80 % of zinc available. Imposing an electrochemical impact during the leaching process increases the quantity of leached zinc by around 5 %. Direct electrowinning from the PLS obtains zinc metal of grade 75-76 %. The suggested treatment removes metals-pollutants from accumulated mixed technogenic waste therefore rendering it more environmentally friendly. Experiments showed that old mixed waste from mining, mineral processing and metallurgy activities merits further studies as secondary source of metals.

scholarly journals PANEL DINDING GEOPOLIMER DENGAN PERKUATAN WIREMESH

2020 ◽  
Vol 16 (1) ◽  
pp. 13-23
Author(s):  
Andini Pratiwi Putri ◽  
Iman Satyarno ◽  
Ashar Saputra
Keyword(s):  
Tensile Strength ◽  
Compressive Strength ◽  
Sulfuric Acid ◽  
Fly Ash ◽  
Environmentally Friendly ◽  
High Hardness ◽  
Filling Material ◽  
Acidic Environment ◽  
Heat Temperature ◽  
Wall Panels

ABSTRAK Pengembangan fly ash berbasis geopolimer sangat cocok untuk memperluas aplikasi pracetak khususnya panel dinding pada lingkungan asam sulfat. Panel berbahan abu terbang ini dapat dijadikan pertimbangan karena memiliki keunggulan diantaranya kekerasan tinggi, ramah lingkungan, tidak menghasilkan gas karbon (CO2), tahan pada temperatur panas antara 600-800° C, tahan lingkungan asam, dan tidak memerlukan perawatan panas. Untuk pembuatan struktur panel pracetak menggunakan bahan pengisi berupa mortar berbahan geopolimer dengan komposisi NaOH 14 M, rasio NaOH/Na2SiO3 sebesar 1 :2, rasio alkaline : fly ash sebesar 35%, dan menggunakan variasi wiremesh sebagai perkuatan, dengan ukuran benda uji panel 800x400x40 mm. Hasil yang didapat kuat tekan umur 1 hari sebesar 11.27 MPa umur 28 hari 60,84 MPa, dengan nilai modulus 28 hari sebesar 13808 MPa. Pengujian kuat tarik 1 hari sebesar 1.02 MPa dan 28 hari sebesar 2,95 MPa Pengujian kuat lentur didapatkan 3,52 MPa tanpa perkuatan dan 4,52 dengan perkuatan. Kata kunci: Geopolymer, panel, wiremesh  ABSTRACT Geopolymer-based fly ash development is perfect for expanding precast applications especially wall panels in sulfuric acid environments. Panels made of fly ash can be considered because it has the advantage of high hardness, environmentally friendly, does not produce carbon gas (CO2), resistant to heat temperature between 600-800 ° C, resistant to acidic environment, and not require hot maintenance.To create the structure of precast panels using mortar filling material with geopolymer with composition NaOH 14 M, ratio of NaOH/Na2SiO3 is 1:2, ratio alkaline ratio: fly ash 35%, and use wiremesh variation, size of panel 800x400x40 mm. Results obtained compressive strength of 1 day 11.27 MPa, age 28 Days 60.84 MPa, modulus elasticity 28-day 13808 MPa. Result tensile strength 1-day 1.02 MPa and 28 days 2.95 MPa, frexural strength panel 3.52 MPa without wiremesh and 4.52 with wiremesh. Keywords: Geopolymer, panels, wiremesh

An environmentally friendly synthesis of 1,4-dihydropyrano[2,3-c]pyrazole derivatives catalyzed by tungstate sulfuric acid

2014 ◽  
Vol 25 (12) ◽  
pp. 1580-1582 ◽  
Author(s):  
Mahnaz Farahi ◽  
Bahador Karami ◽  
Iman Sedighimehr ◽  
Hamideh Mohamadi Tanuraghaj
Keyword(s):  
Sulfuric Acid ◽  
Environmentally Friendly ◽  
Pyrazole Derivatives

Recovery of vanadium and cesium from spent sulfuric acid catalysts by a hydrometallurgical process

2022 ◽  
Author(s):  
Dongseok Lee ◽  
Sung-Ho Joo ◽  
Dong Ju Shin ◽  
Shun Myung Shin
Keyword(s):  
Sulfuric Acid ◽  
Environmentally Friendly ◽  
Acid Catalysts ◽  
Recovery Efficiency ◽  
Hydrometallurgical Process ◽  
High Recovery

An environmentally friendly hydrometallurgical process was developed to recover vanadium and cesium selectively from spent sulfuric acid catalysts, and it has high recovery efficiency and economic advantages.

Sign in / Sign up

Export Citation Format

Share Document