Against the background of increasing shortage of precious metal resources and continuous upgrading
of environmental protection requirements, gold stripping machine, as the core equipment for efficient
gold recovery, is becoming the technological focus of the non-ferrous smelting industry. With the
proliferation of gold-containing materials such as electronic waste and industrial catalysts, the traditional
refining process has been difficult to meet the demand for greening and refinement. The gold stripping
machine realizes efficient separation and purification of gold through innovative processes, and promotes
the resource recycling system to move forward in the direction of intelligence and low-carbonization.
This article will analyze the key technology breakthroughs and industrial value of gold stripping
machine from the technical principle, application scenarios and industry trends.
The core technology principle of gold stripping machine
Gold stripping machine through physical and chemical synergistic effect, from the complex gold-containing
materials in the precise extraction of gold, its technical path can be divided into pretreatment, stripping
purification, tail-end treatment of three major stages, the core process directly affects the recovery rate
and environmental indicators.
Pre-treatment system: material standardization
The difference in the composition of gold-containing materials requires a high degree of adaptability in
front-end processing:
Crushing and sorting: Adopting multi-stage crusher and eddy current sorter to dismantle the electronic
scrap to 0.5-2mm particles, separating metal and non-metal components;
Acid and alkali activation: for gold-plated parts, nitric acid immersion is used to remove the surface layer
of copper and nickel substrate, so that the gold layer is exposed and the efficiency of the subsequent reaction is enhanced;
Microwave roasting: for waste catalysts containing organic matter, volatile components are removed by
microwave heating to avoid contamination of subsequent processes.
Stripping purification: selective separation of gold
Mainstream technologies include chemical depalletization, electrolytic stripping and bioleaching in three
major directions:
Chemical deplating process: adopting cyanide-free system (such as thiourea-sulfuric acid solution) to dissolve
the gold layer, and realizing the gold dissolution rate of >95% by controlling the pH value (1.5-3.0) and
temperature (40-60℃);
Electrolytic stripping technology: applying 0.5-1.2V voltage in the electrolytic tank, so that the gold ions are
directed to migrate to the cathode of titanium mesh, and the purity can reach 99.99%;
Bio-leaching method: using Thiobacillus thiophilus to oxidize sulfide carriers and release micron-sized gold
particles, suitable for treating low concentration gold-bearing tailings.
Tail-end treatment: environmentally friendly closed-loop design
Waste solution regeneration: Ion exchange resin adsorbs residual precious metals, and the treated solution
can be recycled, with a water saving rate of 70%;
Waste gas purification: three-stage spray tower with activated carbon adsorption, so that the emission of
hydrogen cyanide and nitrogen oxides is lower than 50% of the national standard;
Waste residue utilization: glass curing technology converts heavy metal-containing waste residue into
building material aggregate, realizing the goal of zero landfill.
Technical breakthroughs and industry pain points of gold
stripping machine
Micro-interface reaction strengthening technology
The traditional process has the defects of long reaction time and large consumption of chemicals, the new
generation of equipment through the micro-channel reactor to reduce the reaction interface to the micron level:
Mass transfer efficiency enhancement: gold dissolution speed is increased by 3 times, and the amount of
chemicals is reduced by 40%;
Dynamic monitoring system: online spectrometer monitors the concentration of gold ions in the solution
in real time with an accuracy of 0.1ppm to avoid overdosing.
Modularized intelligent equipment integration
Aiming at the needs of small and medium-sized recycling enterprises, the gold stripping machine is being
upgraded in the direction of compactness and automation:
All-in-one design: integrated crushing, stripping and electrolysis functions in 15 square meters of space,
with a daily processing capacity of up to 500kg of material;
Digital control system: PLC programming automatically adjusts temperature, voltage and other
parameters, reducing the error of manual intervention;
Remote operation and maintenance platform: transmit equipment operation data through 5G, cloud
algorithm predicts faults and pushes maintenance program.
Analysis of industry application difficulties
Material complexity: the thickness of the gold layer in electronic scrap varies from 0.05μm to 5μm, and
an adaptive stripping parameter library needs to be developed;
Precious metal loss: nanoscale gold powder is easily lost in the filtration process, and the new ceramic
membrane filtration technology will increase the retention rate to 99.8%;
Environmental compliance costs: some regions require wastewater reuse rate of > 90%, to promote
zero-discharge process R & D investment increased by 20%.
Industrial application and future trend of gold stripping machine
E-waste recycling market outbreak
The world produces 53.6 million tons of electronic waste annually, containing more than 320 tons of gold:
PCB board processing: a large recycling enterprise using electrolytic stripping unit, single line annual recovery
of gold 1.2 tons, the cost is 65% lower than the traditional incineration method;
Connector gold extraction: selective deplating technology has increased the recovery rate of gold-plated
contacts from 82% to 97%, with a purity of AU9999 grade.
Industrial catalyst regeneration field expansion
Petrochemical and automobile industries generate a large amount of waste catalyst, gold stripping machine
opens up new scenes:
Automobile tail catalyst treatment: platinum, palladium and rhodium are recovered from three-way catalytic
converter, and the comprehensive metal recovery rate breaks through 95%;
Petrochemical catalyst regeneration: low-temperature roasting-acid leaching combined process to restore
more than 80% activity of deactivated catalyst.
Technology Iteration Direction and Market Opportunities
Supercritical fluid technology: using supercritical CO₂ to extract gold to avoid chemical contamination, the
recovery rate of the test line has reached 89%;
Artificial Intelligence Optimization: machine learning model analyzes historical data and dynamically
optimizes stripping parameter combinations, improving energy efficiency by 15%;
Municipal mine development: with policy incentives, the domestic e-waste treatment market size is
expected to exceed 150 billion yuan in 2025.
Conclusion: technology empowerment under green circular economy
The technological innovation of gold stripping machine is reshaping the pattern of precious metal recycling industry.
Through the in-depth integration of high-efficiency separation, low-carbon process and intelligent control system,
the equipment not only solves the environmental problems of resource recycling, but also spawns a 100 billion
urban mining market. In the future, with the landing of policies such as “Normative Conditions for the Recycling
Metal Industry”, equipment suppliers with full-process technical solutions will occupy a core position in the
global resource recycling system.