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We build
the world's


Circular Silicon Ltd. stands for a sustainable production of metallurgical silicon.

We produce our green silicon by

recycling silicon waste from the solar industry.

Our Solution

We recycle silicon from wafer production (so called kerf loss) and silicon from end-of-life photovoltaic (PV) panels. Our product is metallurgical silicon with a typical quality of 99%, which we sell as powders, pellets, and lumps.

Quartz + Carbon



Solar Silicon





Ingots & Crystals



Recycled silicon


(purity > 99%)

Silicon waste

from production

(purity > 60%)


You want to cooperate?

We run our own recycling operations or work with recycling partners to lower logistic efforts. We are open to work with partners along the value chain all around the globe.

Our Products

We produce metallurgical silicon with the lowest carbon-footprint in the industry. Our product portfolio includes powders, pellets, and lumps. Our products serve the complete range of silicon applications.

Silicon powders

For chemical products, ceramics, and lithium-ion batteries.

Sizing: < 1mm

Silicon content: 98.5 - 99.99%


Silicon pellets

As an alloying element for aluminum alloys and ferro-alloys. Our pellets have high solubility and can substitute ferrosilicon (FeSi) as well as silicon lumps.


Sizing: 5-10 mm

Silicon content: 98.5-99%

Silicon lumps

The standard commodity for every industry.


Sizing: 10-100 mm

Silicon content: 98.5-99%

Our Produkt
About Us

Silicon is an indispensable raw material for our society: As an alloying element, in chemical products or in solar cells and computer chips. Yet production is energy-intensive and associated with indirect and direct CO2 emissions. Our goal is to save CO2 emissions from primary production by recycling silicon waste streams.

Our Story

Circular Silicon Ltd. was founded in the year 2018 by Dr.-Ing. Jan-Philipp Mai and Aaron Weithäuser with the goal to build a silicon recycling plant in China. With a market share of 75%, China is the biggest producer of solar cells - and thus our raw material supplier. In the past two years, we have built and successfully tested the first prototypes in China. We are currently planning to implement the first pilot line in China and Germany with a production start in 2022. Our know how is based on a strong network with over ten years of experience under the JPM Silicon® brand.

About Us

Are you interested in what we do? Get in touch via the contact form below or send us an E-mail, we are looking forward to talking to you!

Alex Ubl


Thank you!

Circular Silicon Ltd.

Unit 1017, Building 19W, No. 19 Science Park West Avenue, Hong Kong Science Park, Pak Shek Kok, N.T., Hong Kong

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