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Reusing waste tins for construction of roof gutters

August 2020

August 2020

DOI:10.13140/RG.2.2.11914.90560

Authors:

Mirzi Betasolo

The Papua New Guinea University of Technology

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Conference Paper

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Metodologia para o aproveitamento das escombreiras das minas de Vale Pião e Senhora da Guia. Methodo...

October 2015

In Góis municipality, there are many abandoned mines due to the intense mining exploration of tin and tungsten in past decades. Vale Pião and Senhora da Guia are some of the main mines in the region. The present study proposes a methodology for the exploration of the existing waste rock piles, based on the geochemical, mineralogical and grain size characterizations with the objective of ... [Show full abstract] determining its exploration potential. The methodology is developed in 3 stages: (i) stage 1 – waste rock piles inventory and sampling; (ii) stage 2 – characterization laboratorial tests (analytical, mineralogical and grain size); (iii) stage 3 – Sn and W ore reserve calculation. In this study, it is presented the primary results of stages 1 and part of stage 2 of the proposed methodology. Given the heterogeneous nature of the waste rock piles (both composed by rock materials dismounted for opening the mine galleries or by materials that have been processed in the mine’s concentration plant) the geochemical characterization allows the development of a hierarchical classification of the waste rock piles according to its ore content. This way, it is possible to quantify the economically important metals that exist in the waste rock piles and, therefore, evaluate the strategy to apply to its exploration. Keywords: abandoned mining areas, tin, tungsten, geochemistry, waste rock piles exploration.

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Chapter

Recovery of Waste Tinned Copper Wire via Chemistry-Electrowinning Method

February 2020

In this paper, a feasible process was proposed for the recovery of copper and tin from tinned copper. Tin is removed in H2SO4-CuSO4 solution. Then copper and tin are recovered via two-stage electrodeposition due to their differences in electrode potential. Finally, the tail liquid after electrolysis can be reused by adding Cu2(OH)2CO3 to realize the closed loop recycling of tin. The effects of ... [Show full abstract] leaching solution, reaction time and temperature on the separation of tin from waste tinned copper wire were studied. The composition of electrolyte, voltage and anode materials were also investigated on the effects of recovery rate of tin and copper. The results show that copper and tin can be separated well with CuSO4∙5H2O 120–140 g/L, H2SO4 75–100 g/L, temperature 30 °C and reaction time 30 min. When the concentration of HBO3 was 20 g/L, the optimal electrodeposition voltages of copper and tin are 2.00 V and 3.00 V, respectively. The recovery rate of copper is nearly 100%, while the direct recovery rate of tin is about 80%. Graphite anode is much better than stainless steel anode.

Article

A Modest Proposal for Ending Poverty and War

February 1974 · Worldview

James Breig

Waste, as is now well known, has become a cosmic threat. Scientists have warned us that the accumulated product of overpopulation is strangling the environment. Smoky filth darkens the sky, turning the air into lethal gas. The junk of existence piles up, transforming park greens into tin mines. The oil of industry spills death where once there was life. That this must? be stopped is indisputable. ... [Show full abstract] But, until now, no suitable plan has been offered. My modest proposal will cure two of man's greatest ills by ending overpopulation and providing a new source of income for the poor. And, since experts link overcrowding with aggressive behavior, war may even be eliminated.

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Novel Sustainable Metal Removal by Biologically Produced Ferric Sulphate

August 2011

The present work was aimed at studying the effect of biologically produced ferric sulphate on metal removal. By using biologically produced ferric sulphate the amount of 1.40, 1.10, 0.44, 0.40, and 3.016 g/L mass was removed for copper (6 h), nickel (10 h), zinc (8 h), aluminium (36 h) and tin (72 h) respectively. These interesting results motivate further the use of biologically produced ferric ... [Show full abstract] sulphate for mobilization of metals from electronic waste. A sustainable recycling process can be established for extraction of metals from electronic waste by using biologically produced ferric sulphate.