Sludge →Synthetic Fluorite Powder

• ACFP^®, achieving calcium fluoride purity of above 90% and a high fluorine recovery rate.
• Multi-path crystallization control, including seed-induced crystallization, circulating fluidization crystallization and stratified crystallization.
• Extracts synthetic fluorite powder for hydrofluoric acid production while bringing wastewater into fluoride compliance.
• Particle size of 20–60 μm, enabling diverse resource utilization routes with low levels of hazardous impurities.

Background

Fluoride-containing wastewater treatment generates large volumes of fluoride-containing sludge. Its poor quality prevents effective utilization, causing both resource waste and environmental risk. Through innovation in operation and maintenance (O&M), Water Healer extracts synthetic fluorite powder from this sludge, maximizing the value recovered from waste and protecting non-renewable fluorite reserves.

China mines 4.5 million tonnes of fluorite each year. Recovering fluorite from wastewater could cut virgin ore extraction by 30%, delivering enormous economic and, above all, environmental value.

Resource Circulation Pathway

Core Technologies

ACFP^®

Alkalinity control enables targeted purification of calcium fluoride sludge, delivering compliant fluoride removal and fluorine resource recovery at the same time.

Key Innovations

• Multi-Path Crystallization Control · Seed-induced, circulating fluidization and stratified crystallization work together to control crystal form and particle size.
• Defluorination and Recovery in One Step · High-quality synthetic fluorite powder is extracted while the wastewater meets fluoride discharge standards.
• Dedicated Pre-Reactor · An optimized internal reactor structure delivers higher reaction efficiency and lower requirements on fluorite powder quality.
• Full-Chain Resource Recovery · A closed loop from sludge to fluorite powder, electronic-grade hydrofluoric acid and fluorogypsum.

Synthetic Fluorite Powder →Electronic-Grade Hydrofluoric Acid

Electronic-grade hydrofluoric acid is used primarily in the photovoltaic (PV) and semiconductor industries. The sludge generated from treating wastewater discharged by these industries is converted into synthetic fluorite powder, which is then used to produce electronic-grade hydrofluoric acid and sold back to PV and semiconductor manufacturers. A pre-reactor suited to hydrofluoric acid production has been developed, with an optimized internal structure that delivers higher reaction efficiency and lower requirements on fluorite powder quality.

Process Route Comparison

Compared with conventional anhydrous hydrogen fluoride plants, the dedicated equipment and process for synthetic fluorite offer significant advantages:

Electronic-Grade Hydrofluoric Acid →Fluorogypsum

The solid waste gypsum generated during production is processed into a fast-setting, high-strength self-leveling gypsum product that can perfectly replace — and even outperform — cement-based self-leveling mortar.

Gypsum-based self-leveling mortar is a dry-mix mortar designed specifically for floor leveling. It is manufactured in a plant from inorganic cementitious materials, special aggregates and a range of high-performance additives that are scientifically proportioned, precisely batched and homogeneously blended. On site, the mortar can be mixed directly with water (mechanically or manually) into a self-leveling slurry that levels automatically. It is used to level indoor building floors, for example to fill uneven surfaces, fine voids and cracks.