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1. Grinding Fineness Test   The exposure of monomer gold or bare gold surface is a prerequisite for cyanide leaching or new non-toxic leaching methods. Increasing the grinding fineness appropriately can enhance the leaching rate. However, over-grinding not only raises milling costs but also increases the likelihood of leachable impurities entering the leach solution, leading to the loss of cyanide or leaching agents and dissolved gold. To determine the appropriate grinding fineness, a grinding fineness test must be conducted first. 2. Pretreatment Agent Selection Test   Gold ore leaching often requires pretreatment agent selection tests. Common agents like calcium peroxide, sodium hypochlorite, sodium peroxide, hydrogen peroxide, citric acid, and lead nitrate are compared with conventional methods where no pretreatment agent is used, aiming to determine if pretreatment is necessary. Calcium peroxide, sodium hypochlorite, and sodium peroxide are stable and widely used multifunctional inorganic peroxides, characterized by prolonged oxygen release, which helps improve gold leaching rates in leach slurry. Hydrogen peroxide and citric acid supply sufficient oxygen during the leaching process as the main oxygen-generating agents. Lead nitrate’s lead ions (in appropriate amounts) can destroy the passivation film on gold during cyanide leaching, speeding up gold dissolution, reducing cyanidation time, and increasing the leaching rate. 3. Protective Alkali and Lime Dosage Test   To stabilize the sodium cyanide solution or non-toxic leaching agents and minimize chemical losses, a suitable amount of alkali must be added to the leach to maintain a certain slurry alkalinity. Within a certain range, as alkali concentration increases, the gold leaching rate remains constant while the leaching agent dosage decreases accordingly. However, excessive alkalinity slows gold dissolution and reduces the leaching rate, necessitating determining the optimal alkali dosage and slurry pH. In tests and production, widely available and low-cost lime is usually used as the leaching protective alkali. This helps determine the specific dosage needed for practical production. 4. Leaching Agent Dosage Test   In the gold leaching process, the leaching agent dosage is directly proportional to the gold leaching rate within a certain range. However, excessively high dosages not only raise production costs but also have little impact on further increasing the leaching rate. Therefore, based on the grinding fineness test, a leaching agent dosage test is conducted to determine the optimal dosage, further lowering agent consumption and production costs. YX500 is our company’s innovative leaching reagent, replacing cyanide for efficient gold leaching from diverse sources and processes, including gold and silver oxide ores, primary ores, cyanide tailings, gold concentrates, roasting slag, and anode mud. 5. Leaching Time Test   To achieve high leaching rates, extending leaching time is a common practice, allowing complete gold dissolution and maximizing leaching efficiency. As leaching time increases, the gold leaching rate gradually rises until it stabilizes. However, prolonged leaching time also dissolves and accumulates other impurities in the slurry, hindering gold dissolution. A leaching time test is conducted to determine the optimal duration.

Although cyanide holds a significant position in the mining industry, concerns regarding its toxicity have long been a subject of intense scrutiny. Exposure to high concentrations can pose severe risks to both human health and the ecological environment. Consequently, mining enterprises must establish rigorous safety management systems when utilizing cyanide. For mining companies, striking a balance between achieving high recovery rates and ensuring environmental safety will be the key to future development. In this context, Y&X Beijing Technology Co., Ltd. has developed a high-tech product that has successfully replaced sodium cyanide; it is now widely applied in gold beneficiation and smelting processes and is backed by fully independent intellectual property rights. YX500 has successfully achieved industrial-scale production and application. Its proprietary "synergistic leaching" and "in-situ treatment" technologies not only ensure highly efficient gold leaching metrics but also guarantee that tailings slurry meets regulatory standards for discharge. As certified by the China Gold Association, this research achievement has attained an advanced international level in terms of innovation, vast market potential, and overall technical proficiency. In particular, the "synergistic leaching—in-situ treatment" technology component has reached a world-leading standard. YX500 serves as a direct substitute for sodium cyanide, requiring no modifications whatsoever to existing cyanide-based process workflows. The YX500 reagent offers numerous advantages, including low toxicity, environmental friendliness, high recovery rates, excellent stability, ease of operation, rapid recovery kinetics, low dosage requirements, and cost-effectiveness, in addition to being highly convenient for storage and transportation. What is the mechanism behind YX500's low-toxicity gold dissolution? YX500 is an eco-friendly reagent designed to serve as a substitute for highly toxic sodium cyanide. Its primary constituents include sodium cyanurate, alkaline thiourea, alkaline polymeric iron, and carbonates. During the gold leaching process, these components act synergistically to facilitate the complexation reaction between cyanide groups and gold—thereby dissolving the gold—and ultimately enabling its extraction. In summary, compared to traditional sodium cyanide, YX500 offers distinct advantages, including low toxicity, environmental compatibility, high recovery efficiency, exceptional stability, and superior cost-effectiveness. By making the switch to YX500, you can leverage a safer and more sustainable process workflow to achieve outstanding gold extraction results, thereby ultimately enhancing economic returns while significantly minimizing environmental impact.