HPQ Silicon GEN3 QRR Pilot Plant Produces 3N+ Silicon (99.92% Si) in a Single Step

by Team HPQ

MONTREAL, Canada — HPQ Silicon Inc. (“HPQ” or the “Company”) (TSX-V: HPQ) (OTCQX: HPQFF) (FRA: O08), announces the successful validation of a crucial milestone that demonstrates the capabilities of our proprietary technology, the PUREVAP™ Quartz Reduction Reactor (QRR) process.

Our accomplishment is that we have produced Silicon with a purity exceeding 3N+ in a single step.

This validation follows a thorough review of test #5 results from the ongoing GEN3 pilot plant program conducted by technology provider PyroGenesis Canada Inc. (Pyrogenesis).

The results are also highly promising because they confirm the capability of the QRR process to reduce the cash cost of silicon metal manufacturing through a single-step process and by decreasing the feedstock requirement.

“These advancements mark a milestone for HPQ Silicon and highlight the effectiveness of the PUREVAP™ QRR process in modernizing the production of high-purity Silicon while concurrently driving down production costs,” said Bernard Tourillon, President & CEO of HPQ Silicon. “HPQ, with partner Pyrogenesis, is continually advancing its new QRR technology. These recent results demonstrate more positive progress in the efforts to create a new, low-cost process to manufacture of high purity Silicon. The existing processes have remained largely unchanged for the past century.”


Pyrogenesis thoroughly assessed the Silicon material generated during tests #4 and #5 in the series. The samples were analyzed using ICP-MS Silicon Bulk Sample Analysis at Air Liquide Electronics (Balazs NanoAnalysis).

In test #4, the results revealed an average silicon purity (%) surpassing 99.8%. This achievement signifies a noteworthy enhancement compared to the previous best results of 99.6% Si, as announced on March 16th.

However, it is the outcome of test #5 that is noteworthy.

During test #5, we achieved an average silicon purity (%) of 99.92% across two separate tests. This outcome validates the capability of the QRR process to surpass the minimum purity requirement of 3N, specifically for battery-grade silicon.

The achievement moves forward HPQ in its goal of producing high-purity silicon for battery and other high-value applications with the QRR.


Conventionally, the production yield of metallurgical grade silicon (1-2N purity) ranges from 80 to 90% [1]. However, when traditional plants implement optimized processes to produce higher purity silicon (2-3N), production yields are reduced to between 50 and 60% [2].

Our innovative PUREVAP™ QRR reactor, with its unique enclosed design, has the potential to achieve a conversion efficiency exceeding 75% while consistently maintaining a high purity level of 3N+ and more.

This would enable us to produce one unit of silicon using fewer units of feedstock, potentially resulting in a greater than 25% reduction in feedstock usage [3]. If successful, this could provide HPQ with an additional cost advantage compared to traditional methods.

As part of our program’s objective to optimize feedstock utilization in the QRR process, we are delighted to report that test #5 demonstrated this progress. The conversion efficiency of the process reached 20%, a four-fold improvement compared to tests #1 through #4.

“Results to date demonstrate that we are steadily progressing towards attaining a conversion efficiency of 75%, which will represent a leap forward in high-purity silicon manufacturing, providing HPQ with economic advantages and process efficiency within the silicon industry,” added Mr. Tourillon. “We take great pride in the efforts of the team at PyroGenesis and our role in this exceptional opportunity and its potential for transformative impact.”


HPQ Silicon is pleased to announce that it has entered into an agreement to acquire all rights held by the inventors of a new PUREVAP™ QRR provisional patent application related to improvement of the Purity of the Silicon material produce by the QRR by one (1) N. Practically this invention will allow us to increase the purity of our Silicon from the 99.92% already achieved to 99.992%

This contract stems from negotiations between the parties and the debt results from the French legislation stipulating that inventors of a patent are entitled to receive remuneration for their work. That consideration was payable by the patent owner and became a debt affecting the patent.

HPQ, to become the owner and acquire all the rights in a clear patent, negotiated the payment of the debt and agreed with the inventors that the debt in the amount of $ 88,560 will be settled by means of the issuance by the company of 432,000 Units. The payment shall be made, in two stages, being 144,000 Units to each of the three inventors.

Each Unit will consist of one (1) common share of the Company and one (1) warrant to purchase one (1) additional common share of the Company at an exercise price of $ 0.27 for a period of two (2) years after the closing date of the transaction. The first issue of 72,000 units to each of the inventors will be made on the date the Company receives TSX Venture Exchange approval. The second issue of 72,000 Units will be made to each of the inventors at the time of the international filing of the patent. This transaction is subject to TSX Venture Exchange and regulatory approval.


[1] B. Ceccaroli, O. Lohne; Solar Grade Silicon Feedstock; Handbook of Photovoltaic Science and Engineering; J. Whiley (2003)
[2] Andersen, V., Solheim, I., Gaertner, H., Sægrov-Sorte, B., Einarsrud, K. E., & Tranell, G. (2023). Pilot-Scale Test of Flue Gas Recirculation for The Silicon Process. Journal of Sustainable Metallurgy, 9(1), 81-92.
[3] Management refers to public information from Ferroglobe PLC investor presentation dated October 17, 2017 (Page 5). According to this information, approximately 45% of the total cost of producing Metallurgical grade Silicon (98.5% – 99.5% Si) is attributed to feedstock expenses, primarily quartz and reductant. Reaching a conversion efficiency exceeding 75% would result in a reduction of about one-third of the required amount of feedstock needed to make silicon metal. Therefore this reduction in feedstock usage could result in an HPQ cost advantage of over 14% (45% * 33%) compared to traditional methods.

HPQ Silicon is a Quebec-based TSX Venture Exchange Tier 1 Industrial Issuer. With the support of world-class technology partners PyroGenesis Canada and NOVACIUM SAS, the company is developing new green processes crucial to make the critical materials needed to reach net zero emissions.