scholarly journals Mineral paste production from phosphate rock tailings

2015 ◽  
Vol 68 (1) ◽  
pp. 103-108
Author(s):  
André Carlos Silva ◽  
Elenice Maria Schons Silva ◽  
Ângelo Pereira da Silva Junior ◽  
João Paulo Aparecido Arruda ◽  
Vitor Rodrigues de Araújo Vaz
Keyword(s):  
Environmental Degradation ◽  
Sedimentation Rate ◽  
Phosphate Rock ◽  
Processing Plant ◽  
Tailings Dam ◽  
Vacuum Filtration ◽  
Second Stage ◽  
Unit Operations ◽  
Industrial Unit ◽  
Anglo American

The dewatering stage is among the most important industrial unit operations, and is widely adopted in many different industries. Nowadays, mineral processing tailings disposal is a big problem due to the environmental degradation it causes. The phosphate rock processing in Anglo American Phosphate Brazil, situated in Catalão/ Go/Brazil, generates around 180 t/h of tailings for a plant feed of 480 t/h (approximately 37.5% of the processing plant feed), with 5 to 10% of solids and approximately 14% of P2O5. Nowadays, the tailings are sent directly to the tailings dam. The present work proposes paste production using the tailings from the phosphate rock processing plant. Through decantation of a tailings sample, a clarified liquid was obtained and drained. The decanted pulp then went through a second stage consisting of vacuum filtration. Flocculant addition in this stage generated a faster sedimentation rate and a higher dewatering performance in next stage of dewatering, because the flocculated material was retained by the filter medium instead of passing through it. The results were satisfactory for paste tailings production with a solid percentage of around 65%.

scholarly journals KETAHANAN MASYARAKAT PESISIR KECAMATAN KAMPUNG LAUT DALAM MENGHADAPI PENYUSUTAN LAGUNA SEGARA ANAKAN

2019 ◽  
Vol 15 (2) ◽  
Author(s):  
Lintang Rahmayana ◽  
Wiwandari Handayani
Keyword(s):  
Environmental Degradation ◽  
Sedimentation Rate ◽  
External Factor ◽  
Community Resilience ◽  
Internal Factors ◽  
Real Condition ◽  
Resilience Index ◽  
Capacity Index ◽  
Segara Anakan Lagoon ◽  
Resilience Capacity

The existence of Segara Anakan Lagoon increasingly getting worse. The amount of sedimentation rate makes the lagoon has height sediment. In addition the environmental degradation that happen caused by community activity, this can make worsening the situation.  This study aims to assess the resilience capacity index of lagoon community in Kampung Laut Sub-district towards the decline of lagoon area. The variables used in this study are economic, human, social, physical and ecological. The five variables have indicators that can represent the resilience if lagoon community in Kampung Laut sub-district.  Based on the results of the analysis conducted, it can be seen that the resilience index of the Kampung Laut community is in the medium category with a index of 0.52. However, if this assess more deeply, the resilience of Kampung Laut community might occur because the external factor more dominating than internal factors. This situation makes the Kampung Laut community resilience pretending to have enough resistance than the real condition. Behind this condition, it makes the community dependent on assistance from external parties, so the Kampung Laut community resilience gained not because they are empowered but there are other factors that influence it.

scholarly journals Recovery of bauxite ore particles -1mm from tailings of the Tan Rai bauxite processing plant by mechianical classifiers

2021 ◽  
Vol 62 (3b) ◽  
pp. 51-57
Author(s):  
Minh Van Nguyen ◽  
Hau Van Nguyen ◽  
Keyword(s):  
Mineral Resource ◽  
Resource Utilization ◽  
Environmental Effects ◽  
Mineral Processing ◽  
Processing Plant ◽  
Tailings Dam ◽  
High Loss ◽  
Study Results ◽  
Additional Amount ◽  
Bauxite Ore

Tailings of the Tan Rai bauxite mineral processing plant contain a relatively high proportion of fine bauxite ore particles of less than 1mm. This amount of discarded fine bauxite particles necessarily leads to a high loss of valuable bauxite mineral and also require more tailings dam space. Recovery of such fine bauxite ore particles may produce certain economic and environmental effects to the current processing plant. The paper presents results of the study on recovery of fine bauxite ore particles -1 mm from tailings of the Tan Rai - Lam Dong bauxite mineral processing plant by the use of mechanical classifiers. The obtained +0.5 mm bauxite concentrate are suitable for blending with the +1 mm concentrate of the current plant. The study results showed that recovery of fine bauxite ore particles -1mm from the plant tailings may produce additional amount of valuable concentrate to ensure the supply requirements to the alumina plant and also add some values to the effective mineral resource utilization and bring some economic efficiency.

scholarly journals PASTE PRODUCTION FROM PHOSPHATE ROCK TAILINGS TROUGH FREE SETTLING AND VACUUM FILTRATION

2014 ◽  
Author(s):  
André Carlos Silva ◽  
Elenice Maria Schons Silva ◽  
Juarez Gonçalves Mesquita ◽  
Ângelo Pereira da Silva Junior ◽  
João Paulo Aparecido Arruda ◽  
...  
Keyword(s):  
Phosphate Rock ◽  
Vacuum Filtration

Embracing Green Temporalities: Indigenous Sustainabilities, Anglo-American Utopias

2020 ◽  
pp. 147-156
Author(s):  
Michelle C. Neely
Keyword(s):  
Environmental Ethics ◽  
Environmental Degradation ◽  
Resource Extraction ◽  
Biotic Community ◽  
Zero Waste ◽  
Anglo American

Against Sustainability concludes with a coda that contrasts Anglo-American and certain Indigenous American approaches to “zero waste.” Upton Sinclair’s The Jungle (1906) illustrates the limitations of a manufacturing-focused ethic. By contrast, Robin Wall Kimmerer’s Braiding Sweetgrass (2013) links a zero-waste ethic to a decolonized relationship to the land. Achieving this version of zero waste requires transforming not simply U.S. manufacturing and disposal processes, but its culture. Using these examples, the coda suggests that there are contexts in which sustainability works as a paradigm. It makes sense to “sustain” Indigenous environmental cultures that resist rather than perpetuate the systems responsible for our environmental degradation. By contrast, Anglo-American sustainability maintains continuity with capitalism’s profit and growth imperatives, with settler colonial resource extraction, and other values and practices inimical to just biotic community. Radical action will only come from transformative environmental ethics that help Americans confront our past truthfully and then imagine and act for a more ecological present. Replacing sustainability with an orientation toward functional utopianism, and remaining committed to strategic, provisional ethics—such as joyful frugality and radical pet keeping—might help bridge the gap between our deadly present and a more livable future.

scholarly journals Flow of simple superphosphate using two-stage decomposition of phosphorite

2021 ◽  
Vol 939 (1) ◽  
pp. 012055
Author(s):  
Kh Otaboev ◽  
D Sherkuziev ◽  
Sh Namazov ◽  
R Radjabov ◽  
A Seytnazarov
Keyword(s):  
Sulfuric Acid ◽  
Reaction Time ◽  
Phosphoric Acid ◽  
Phosphate Rock ◽  
Drying Process ◽  
Acid Decomposition ◽  
Two Stage ◽  
Second Stage ◽  
High Carbonate ◽  
Sulfuric Acid Decomposition

Abstract The methods for producing simple superphosphate by two-stage sulfuric acid decomposition of natural phosphates are analyzed. For the first stage, the process of decomposition of high-carbonate powdered phosphorite is studied depending on the rate of sulfuric acid from stoichiometry to the formation of H3PO4, its concentration and the reaction time of the starting components. For the second stage, the process of neutralization of phosphoric acid is studied, depending on the norm of phosphate rock for the formation of Ca(H2PO4)2. The drying process of superphosphate is carried out, in which granular superphosphate is obtained, and P2O5total. - 12%, P2O5free. - 4.6%, P2O5dig : P2O5total = 90%, P2O5 water : P2O5total = 79%.

scholarly journals Performance Evaluation of AOP/Biological Hybrid System for Treatment of Recalcitrant Organic Compounds

2010 ◽  
Vol 2010 ◽  
pp. 1-10 ◽  
Author(s):  
Stanford S. Makgato ◽  
Evans M. Nkhalambayausi-Chirwa
Keyword(s):  
Organic Compounds ◽  
Advanced Oxidation Process ◽  
Nuclear Industry ◽  
Second Stage ◽  
Unit Operations ◽  
Recovery Unit ◽  
Toxic Pollutant ◽  
Bioreactor System ◽  
High Concentrations ◽  
Process Wastewater

Process water from nuclear fuel recovery unit operations contains a variety of toxic organic compounds. The use of decontamination reagents such asCCl4together with phenolic tar results in wastewater with a high content of chlorophenols. In this study, the extent of dehalogenation of toxic aromatic compounds was evaluated using a photolytic advanced oxidation process (AOP) followed by biodegradation in the second stage. A hard-to-degrade toxic pollutant, 4-chlorophenol (4-CP), was used to represent a variety of recalcitrant aromatic pollutants in effluent from the nuclear industry. A UV-assisted AOP/bioreactor system demonstrated a great potential in treatment of nuclear process wastewater and this was indicated by high removal efficiency (>98%) under various 4-CP concentrations. Adding hydrogen peroxide (H2O2) as a liquid catalyst further improved biodegradation rate but the effect was limited by the scavenging ofOH•radicals under high concentrations ofH2O2.

PASSION FRUIT BY-PRODUCT: PROCESS DESIGN OF PECTIN PRODUCTION

2020 ◽  
Vol 8 (10) ◽  
pp. 58-69
Author(s):  
Cariny Maria Polesca de Freitas ◽  
Ricardo David Martins ◽  
Manoela Maciel dos Santos Dias ◽  
Jane Sélia dos Reis Coimbra ◽  
Rita de Cássia Superbi de Sousa
Keyword(s):  
Process Design ◽  
Scale Up ◽  
Liquid Extraction ◽  
Passion Fruit ◽  
Processing Plant ◽  
Juice Processing ◽  
Unit Operations ◽  
Processing Line ◽  
Balance Energy ◽  
Solid Liquid

This work aimed to dimension a processing line for the extraction of pectin from passion fruit peels to the scale-up of an industrial pulp and juice processing plant. Taking into account that a medium-sized industry in Brazil processes 3,000 tons of passion fruit annually, the production of pectin was 23,934.24 kg·year-1, under the extraction conditions of 80 °C, 52.5 min, and 0.0002 mol·L-1 of citric acid. The process includes unit operations such as solid-liquid extraction, filtration, drying, and grinding of the pectin. The calculations of mass balance, energy balance, and the dimensioning of the equipment were made from data provided by the literature and by equipment suppliers. The results achieved help in the implementation of this process on an industrial scale.

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