Archive for the ‘TREATMENTS’ Category

Fish sperm a ‘key ingredient’ to recycling rare earth elements

Thursday, January 22nd, 2015

Fish sperm a ‘key ingredient’ to recycling rare earth elements

Salmon sperm is considered industrial waste from fishery industries, so it would be a cheap and green alternative to current rare earth extraction methods. (Image by Sekar B. |

Japanese scientists have developed a process that uses salmon sperm, also known as milt, to mine and reprocess rare earth elements (REEs) from ore and materials such as magnets and electronic waste.

Currently the extraction REEs is costly and potentially environmentally damaging. But the new method proposed by the University of Tokyo team, published in the journal PLOS One, could provide a clean and cost effective alternative.

Yoshio Takahashi and his colleagues were studying the absorption of REEs by bacteria cells when they found that the phosphate site plays an important role in the binding of metal ions, which let them to consider the possibility of DNA (which also has a phosphate site) being used to extract REEs in water.

To test their theory, the researchers used powdered milt and a solution containing the primary metals used in neodymium magnets—neodymium, dysprosium, and trivalent iron. When mixed together, the ions in the metal were attracted to the phosphate in the salmon semen.

This isn’t the first time fish sperm – or rather the DNA contained within — has been used in unusual ways.
This isn’t the first time fish sperm – or rather the DNA contained within — has been used in unusual ways. Among the strangest are fireproof coatings and templates for mass-producing silver nanoparticles.

Takahashi acknowledges that, while there isn’t much money in recovering REE from scrap magnets, the salmon-milt process might be better suited for extracting and recycling other elements on a large scale.


Henry Sapiecha


Friday, May 17th, 2013


Researchers at Northwestern University in Illinois have discovered a new method for mining gold which is inexpensive and non-toxic, reports

Instead of cyanide, the procedure uses cornstarch to separate gold from raw materials. It can also be used on consumer electronic waste to recover the gold from them.

The research team found the method by accident during laboratory testing.

A university spokesman said the elimination of poisonous cyanide from the gold industry is of utmost environmental importance.

Most gold miners currently use the toxic leaching process to isolate the yellow metal from the ore.

rockpicker1 Comments

Why not use Thio-Red? it is non toxic, cheap and is American made.

Paul Tat Comments
Sugars are known reducers of precious metals and even of the base metals (even bad Cr 6) so what is all this fuss about precipitating potassium-aurobromate from solution? Ok Is selective, So What? How do you get the “green gold” from ore to solution? Ok with bromic acid. So where is the new gimmick?

Henry Sapiecha


Sunday, November 27th, 2011

Air and noise pollution are two major concerns that communities have about neighboring mining operations. Governmental regulations are in place to limit the amount of air emissions allowed in the mining industry. Two types of air emissions must be controlled, point-source and fugitive emissions. Wet-suppression, Bag-house filtration, or enclosures can reduce point-source dust emissions. Wetting aggregate pile during loading, wetting roadways and controlling the speed limit of vehicles will reduce fugitive emissions. Blasting creates short term dust emissions and ground vibrations. Acceptable blasting times and vibration limits must be adhered to in order to minimize community complains. Enclosures will also reduce the amount of noise pollution emitting from the plant. Shrubs and trees will act as a buffer zone between operational noise and the community. Author: Maryland Center for Environmental Training / College of Southern Maryland Publication D

Sourced & posted by Henry Sapiecha


Sunday, November 27th, 2011

The protection of water resources is essential to mining operations. Process water is generated through plant operations. Process water can be managed through closed-loop process water settling ponds. Stormwater should be directed away from process water. If it comes in contact with process water it must be treated as process water. Regular inspections will ensure that your water controls are working properly. A spill and leak countermeasure control plan must be drawn up and kept onsite. Petroleum products should be properly protected and stored. The plant is responsible for any onsite spill regardless of the source. Author: Maryland Center for Environmental Training / College of Southern Maryland Publication Date: 2000

Sourced & posted by Henry Sapiecha


Sunday, November 27th, 2011

Suncor Energy Inc.’s new Tailing Reduction Operations use new technology and management processes that are expected to reduce tailings reclamation time by up to two decades, as compared to current methods. The reduced reclamation time is attributed mainly to a new polymer flocculent that can separate fine clay particles from water in the mature fine tailings (MFT) faster than previous technology. Once separated, water can be recycled back into Suncor’s operations, and the leftover dry matter can be reclaimed in place or moved to another location for final reclamation. By speeding up the drying process, Suncor has increased their ability to process MFT from 1500 tonnes per month (2009) to 25000 to 30000 tonnes per day. Processing MFT faster allows both for faster reclamation times, and also significantly reduces the need for the number of tailings ponds.

Sourced & posted by Henry Sapiecha


Friday, August 26th, 2011

Weir Minerals Africa wins major screening

order in Indian iron ore mining


Weir Minerals Africa has received its biggest order from India to date – seven Linatex vibrating screens of various sizes for RBSSN, a mining and metals company based in Hospet, in northern Karnataka.

The order includes the biggest screen Weir has supplied to India, with dimensions of 2.4 m by 4.8 m. Weir Minerals Africa’s Chris Dorlas says the order, which is destined for an iron ore application, is a milestone for the company, since it firmly establishes Weir Minerals’ footprint in India and will serve as a reference base for further sales in that country.

The RBSSN order includes three VD18/38, one VD15/38 and one VD21/48 dewatering screens. Linatex dewatering screens incorporate a 45o sloping back section, fitted with slotted apertures across the direction of the flow. Incoming slurry is fed uniformly along the top of this back section, which acts as a vibrating drainage panel. The screen’s main deck slopes upwards at 5o and is fitted with smaller slotted apertures.

“This design achieves exceptionally high dewatering and draining capacity,” Dorlas says, “making it possible in many cases to use smaller units than if one was using conventional dewatering screens. This, in turn, reduces the cost of the initial investment in the screens.”

At the lowest point of the screen, where the sloping back and main deck meet, a pool of partially dewatered slurry forms. Here, solid particles bridge over the apertures and form a cake, which acts as a filtration platform, allowing only quite fine particles to pass through. The vibration action conveys the cake along the screen and out of the pool, where further dewatering takes place, depending on the porosity of the cake, which is finally discharged over the adjustable weir into the product chute.

Vibration is produced by two linear motion low noise exciter motors operating at 980 or 1460 rpm. Alternatively, geared exciters with an external drive motor can be fitted to the larger screens. Both the vibrating motors and the geared exciter have been specifically designed to ensure long life, with minimum maintainance requirements.

Easy adjustment of the amplitude of vibration and deck inclination, as well as the discharge weir plate, are features incorporated to suit changes in process requirements. A high solids recovery outcome is achieved when the screen underflow is kept in closed circuit, with the only solid losses occurring as the very fine material exits in the cyclone overflow.

The two large Linatex HG24/48 screens included in the RBSSN order are horizontal linear motion screens. Linear motion is produced by the action of counterweights on separate shafts, geared together to produce a straight line “throw”. The mechanism’s direction of rotation does not affect the pattern of motion.

“Linear motion provides excellent performance in applications such as wet screening, desliming and dewatering, owing to the ability to break the surface tension between deck apertures and the pulp being screened,” Dorlas says. “Screen capacities vary widely, depending on the material characteristics and the separation required.

“Screen design has evolved and improved over many years of operational experience and industry know-how. However, the company has actively taken these improvements to the next level and introduced the Finite Element Analysis (FEA) method of design to our development technology some years ago. Our in-house FEA capabilities have assisted in optimising the mass and strength of the screens, helping to provide lower cost solutions, both in terms of capital and operational costs.”

The Weir Group acquired the Linatex group of companies in September 2010, now marketed as Lintex® rubber products. Dorlas says that these products are proving a valuable addition to the Weir Minerals product line and assist the company in positioning itself as a solutions provider. The South African Linatex manufacturing facility in Alrode is capable of producing screens up to 4.9 m wide by 10 m in length.

Sourced & published by Henry Sapiecha


Friday, May 27th, 2011


Sourced & published by Henry Sapiecha