The PennZone

TOLARDO, Calif. & FREMONT, Calif. - PennZone -- HONGKONG DONGSHENG Precious Metals Recycling Company focuses on carbon reduction, employing an innovative processing method for plastic waste containing precious metals: replacing incineration with chemical recycling. When recovering platinum and palladium adsorbed by plastics such as syringes, this process reduces carbon dioxide emissions to 10% of traditional methods while simultaneously regenerating high-purity plastic raw materials. The Korea Institute of Science and Technology has developed a bioleaching system that uses ethanol industrial by-product concentrated distillation liquid (CDS) as a nutrient source, combined with the Chromobacterium violaceum strain, achieving a golden recovery rate of 98.6% from discarded memory chips while reducing reagent costs by 62%. These technologies demonstrate the feasibility of distributed precious metal recycling models operating in urban areas.

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Types of industrial precious metals

The core targets of industrial precious metal recovery include five categories: platinum (Pt), palladium (Pd), rhodium (Rh), silver (Ag), and iridium (Ir). 37% of platinum demand comes from automotive precious metal catalysts, 24% from jewelry, and 30% from industrial applications; palladium and rhodium are primarily used in gasoline vehicle three-way catalysts to reduce nitrogen oxide emissions; Silver, due to its excellent conductivity, is used in the conductive layer of solar cells (20 grams per panel) and as electrodes in multilayer ceramic capacitors (MLCCs);

The role of industrial precious metals

Precious metals play irreplaceable catalytic, conductive, and reinforcing roles in industrial systems. The automotive industry relies on platinum-palladium-rhodium ternary catalysts to convert hydrocarbons and carbon monoxide in exhaust gases into harmless substances, meeting Euro 7/China 6 standards; the chemical industry uses platinum-rhodium-palladium alloy mesh to catalyze the ammonia oxidation reaction, with a single nitric acid production unit consuming 120–150 kilograms of platinum annually; the electronics industry uses silver paste for printing integrated circuits and relies on ruthenium-based resistor paste to ensure current stability in micro-components.

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The recycling value of precious metals

Precious metal recycling offers both economic benefits and ecological necessity. From a value perspective, each ton of discarded memory contains 427 grams of gold, far exceeding the grade of primary gold mines (typically 1-10 grams per ton); solar panel recycling can extract 20 grams of silver per panel, while silver demand is growing at a 7% annual rate due to the expansion of the photovoltaic industry. Environmental benefits are equally significant: photocatalytic recycling technology can dissolve platinum group metals at room temperature, avoiding the production of millions of tons of strong acid waste liquid from traditional metallurgy; bioleaching reduces cyanide usage by 89%, mitigating environmental risks from "urban mining" near residential areas.