Allup Silica (ASX: APS) packs a punch with premium low iron silica.


Allup Silica Limited (ASX: APS) is pleased with the results of its latest metallurgical tests, which show that the company has seen improvements in its process circuit design.

The samples, taken from Allup’s Sparkler silica exploration project in Western Australia, yielded a consistently high grade of 2O3 silica sand product.

It should be noted that grades of this purity are deemed suitable for the photovoltaic industry, which also happens to be the company’s primary target market.

Source: Company Update

Silica sand as a raw material is used in many applications such as

  • ceramic production
  • production of optical fibers
  • the production of refractory materials and the manufacture of glass, including the manufacture of special glasses for photovoltaics and other high-tech applications such as glass for mobile phones.

However, impurities, especially Fe2O3adversely affect silica sand products, by

  • decrease in glass transparency
  • bleaching ceramic products
  • fiber optic transmission loss, and
  • lowering the melting point of refractory materials.

Silica sand with these impurities is generally less valuable without any surprises.

Source: Company Update

The results associated with the newly improved process circuit design are

  • Fe2O3 impurity dipped to an average of 84 ppm Fe2O3 (65 ppm to 110 ppm on 4 samples).
  • If O2 scores ranged from 99.7% (lowest) to 99.8% (highest).
  • Phenomenal 95% to 97% recovery (yield) of SiO2 was achieved through all aiming tests, also setting the tone for further optimization work.

In the company’s own words, their outcome on process circuit design is a positive step towards creating a high-purity silica sand suitable for use by the photovoltaic industry (specification >99.5% SiO2 and 2O3).

Additionally, testing is underway to improve the proposed process circuit methodology and achieve the ultimate goal of consistent iron at less than 100 ppm in all of the Company’s exploration projects.

Testing was performed on four samples from the Sparkler A silica exploration project, as part of the current inferred mineral resource estimate. Metallurgical testing was carried out at Nagrom’s mineral processing facility in Perth. Subsequently, the results were forwarded to Battery Limits Metallurgical Consultants for review and preparation of an independent metallurgical report.

Source: Company Update

The trials covered a standard silica sand processing circuit, including flotation. Summary data is primarily derived from viewfinder float results.

The results show a satisfactory recovery (>95%) of SiO2 to float the tails (product), and a decrease in the content of impurities in all cases, with a dip in Fe2O3 between 11% and 33% (Fe2O3) recovered to focus.

In total, of the four aiming tests performed, there were variations in the qualities of SiO2with 3 getting Fe2O3 grade with 2O3 and TiO2.

Source: Company Update

Allup believes that high quality silica sand of this low iron specification will be in high demand in the manufacture of premium ultra-clear cover glass, especially for the burgeoning photovoltaic manufacturing industry. growth.

The next work program will serve several purposes:

  • propose a more homogeneous solution with a low impurity content (2O3) product
  • look for the possibility of reducing operating and capital costs
  • ensure consistent quality assurance/quality control (QA/QC) in place, and
  • invent a methodology to support increasing the depth of sand to be mined viably, as this can increase estimated mineral reserves.

APS shares were trading at AU$0.099 at noon on October 12, 2022, up 10% from the last close.


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