The sodium cyanide substitute is available in powder form, is virtually odorless, and is highly soluble in water. The reagent is certified and can be transported by any mode of transport (sea, air, rail, and road) with reduced costs and customs clearance, as per general product documentation. The reagent is nonflammable, nonexplosive, nonhazardous as an oxidizer, has zero radioactivity, and is safe for transportation. Before use, the reagent is dissolved in clean, warm water.
Product Implementation Standard: Q/DSJ 01-2014
Low toxicity and environmental protection: The product is non-flammable, non-explosive, non-oxidizing, non-radioactive and low toxic. It is a common chemical product, environmentally friendly and safe. The results of the product toxicity test conducted by the Health Monitoring and Inspection Center showed that the acute oral toxicity LD50 in mice was 50.1 mg/kg body weight; the toxicity was lower than that of caustic soda (LD50 of caustic soda was 40 mg/kg body weight).
The environmental analysis and testing center carries out leaching toxicity analysis and testing of tailings granules after product use, and the tailings granules after spraying meet environmental protection requirements.
Stable performance: reduce the impact of harmful substances such as arsenic As and sulfur S；
Wide application: It is suitable for the production of heap leaching, pool leaching and carbonaceous slurry leaching (stirring) processes of oxidized gold and silver ore, primary ore, sulfide ore, cyanide tailings slag, gold concentrate, etc., the scale can be large or small, and it is more suitable for large-scale pile leaching production.
High leaching rate: The effective leaching of gold ions is higher and faster than that of sodium cyanide, and the recovery rate is improved.
Faster recovery: The production cycle of heap leaching is shorter than that of sodium cyanide (which can be reduced by about 30%), and the recovery is faster.
More economical dosage: the effectiveness is long-lasting and stable, and the dosage is more economical than similar products.
Cost reduction: reducing the cost of purchasing, transportation, warehousing, storage, use, safety and environmental protection, etc.；
Easy to use: The heap leaching production process follows the sodium cyanide method, which is easy to use and popularize;
Easy to transport: It can be transported by road, rail, air and sea.
It promotes environmental management. This is a new product that can completely replace highly toxic sodium cyanide. It is used in mineral processing and precious metal production, such as gold and silver mines, completely eliminating sodium cyanide pollution and its harm to the environment, benefiting the country, the people, and humanity.
It promotes safe production in mining enterprises and reduces management costs. Due to strict approval and supervision procedures for the procurement, transportation, storage, and use of sodium cyanide, enterprise safety risks have increased and enterprise management costs have increased. The environmentally friendly gold selection agent has low toxicity and is harmless to the environment, and can be used in accordance with conventional chemical products.
Ease of use and promotion. The technological process of using an environmentally friendly agent for gold extraction during the storage and leaching of oxidized gold in mines is similar to the method of using sodium cyanide.
This can improve the economic efficiency of mining operations. Environmentally friendly gold concentrators are used in mineral processing and precious metal production, such as gold and silver mines. They offer advantages such as short leaching times, high leaching rates, high recovery rates, low toxicity, environmental protection, and low cost.
This environmentally friendly gold extractant is used in the same processes as sodium cyanide-based methods, including heap leaching, tank leaching, and the production of gold and silver from oxide ores, primary ores, sulfide ores, cyanide tailings, and gold concentrates using the CIP (CIP) method. Precious and lean liquors can be reused in the production process, with activated carbon adsorption being the optimal method for extracting gold from precious liquors. Optimal gold leaching occurs at ambient temperatures above 10°C. It is compatible with cyanide-based gold recovery methods.
1.Alkalinity adjustment: As an alkaline inorganic compound, this product requires stabilizers such as lime or caustic soda (preferably more lime and a minimum of caustic soda). Maintain the pH of the heap (or slurry) at 11 ± 1. After stockpiling or collecting the raw ore, adjust the alkalinity of the return/effluent water to a pH of 11 ± 1 (check with precision pH paper 9.5-13).
2. Dosage: The dosage is approximately 5.0–10.0 parts per ten thousandths of the ore (500–1000 grams of reagent per ton of ore). The properties, grade, and pH of the ore affect the dosage. The actual dosage can be calculated based on the mass concentration of the chemical solution.
3. Dosing method: completely dissolve in water at room temperature before use (dissolution is accelerated in running water or with vigorous stirring; for heap leaching, build a dosing tank next to the settling pond so that the return water after carbonation directly flushes the gold extractant into the settling pond).
Before initial dosing, adjust the alkalinity so that it exceeds 10. When the water level in the basin is low, rinse with alkali and reagent simultaneously. Use two rinse buckets to separately rinse the lime (or caustic soda) and gold recovery agent into the reagent solution basin (leaching basin) or directly into the dissolution basin, ensuring a uniform reagent concentration throughout the entire area. For heap leaching processes, dosing and spraying can be performed simultaneously.
Initial phase: Maintain the solution concentration at approximately 1‰ (i.e. reagent to water ratio of 1:1000, which corresponds to 1 kg of reagent per 1 m³ of water) for 7-10 days.
Intermediate phase: Maintain the solution concentration at approximately 0.5‰ for 20-30 days.
Final phase: Maintain the solution concentration at approximately 0.3‰ until adsorption is complete.
4. Calculation of chemical dosage:
① The dosage can be compared with the use of sodium cyanide. Conduct mineral processing tests and select the optimal conditions (typically 1–2 g/t for oxide ores, maintaining the chemical concentration at 0.3–1.2‰ or titration concentration at 0.075–0.3‰, adjusted for ore and impurity content);
② Dosage calculation formula: Replenishment dosage = (optimum solution mass concentration – currently measured solution mass concentration) × volume of water in the dosing tank Example: Assume that the optimum solution mass concentration is 1.2‰ (by volume of water), the solution mass concentration in the return water is 0.6‰, and the lean liquid tank holds 500 cubic meters of water: Replenishment dosage: (1.2 – 0.6) × 500 = 300 kilograms.
5. Chemical Concentration: Since ore composition and pH levels vary, the optimal chemical titration concentration (‰) should be determined by testing ore samples. The mass concentration of the chemical (‰) is then calculated using the following formula:
Mass concentration of chemical (‰) = Chemical titration concentration (‰) × 4 (4 is an empirical value)
Example: if the concentration of a reagent is 0.07 ‰, then the mass concentration of the reagent (‰) = 0.07 ‰ × 4 = 0.28 ‰ (i.e. the ratio of reagent to water is 0.28:1000).
Dose the gold extraction agent according to the calculated ratio. The titration reagent concentration can be determined using the following method.
(I) Necessary equipment and reagents
1. Conical flask 250 ml × 1;
2. Pipette with ball, 10 ml × 1;
3. Acid burette × 1;
4. Dropper × 1;
5. Test reagent (preparation: dissolve 1.7331 g of silver nitrate in distilled water to 1000 ml);
6. Dye (method of preparation: add 0.02–0.05 g of rhodanine to 100 ml of acetone).
(II) Detection Method
Using a 10 ml pipette, transfer 10 ml of the test solution into a conical flask;
Add two drops (about 0.1 ml) of dye from the dropper into the conical flask; the liquid will turn pale yellow;
Using an acid burette, slowly add the test reagent to the conical flask (during titration, gently shake the flask, observing the color change; make sure the titration takes place in natural light);
The endpoint of the titration is reached when the color of the liquid changes from pale yellow to pale red. Stop the titration and calculate the number of milliliters (ml) of reagent consumed;
The number of milliliters of reagent consumed represents the concentration of the test solution in parts per thousand (PPK). For example, if 0.7 ml of reagent is consumed, the concentration is 0.07 PPK (i.e., 0.07‰). If 1.0 ml is consumed, the concentration is one part per ten thousand (0.1‰). Proceed in a similar manner.
(III) Precautionary measures
1. Reagents should be kept in dark containers during transportation, storage and use.
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