Hydrometallurgy

Due to the low grade of tailings, the reuse of hydrometallurgical methods is the mainstream process for comprehensive resource utilization. Haipu's selective and high-precision special adsorbent materials help improve the efficiency of tailings resource conversion and increase corporate profits.

• Separation and recovery of cobalt and copper from low-concentration copper-cobalt tailings

• Gold recovery and recovery of associated elements such as copper, lead, and zinc from gold tailings

• Comprehensive utilization of copper tailings to recover valuable resources such as copper, sulfur, iron, zinc, lead, gold, and silver

• Comprehensive recovery of other metal tailings such as iron, manganese, tungsten, and molybdenum

In copper mine extraction and hydrometallurgical refining, roasting + acid leaching + extraction + electrowinning is usually adopted. However, the tailings water and raffinate still contain considerable copper ions. Special adsorption methods can selectively recover low concentrations of copper ions from this type of waste liquid, concentrating them to more than 3% and reusing them in the electrowinning process to obtain high-quality cathode copper.

Special adsorbent materials can selectively enrich and separate nickel ions, achieving efficient extraction of low-grade nickel ore.

Special adsorbent materials recover valuable resources and deeply treat pollutants by extracting rhenium, removing arsenic, removing arsenic, removing cadmium, and removing fluoride from waste acid.

Gallium is extracted from Bayer process solution by ion exchange. After the resin adsorbs saturated gallium, it is eluted with a special alkaline complexing eluent. The qualified eluate is processed through evaporation, concentration, freeze crystallization, and oxidation, and then electrolyzed to obtain gallium products. The spent resin can be reused after regeneration. The process is simple, the product cost is low, and it is environmentally friendly. The gallium adsorption rate can reach 60%~65%, and the electrolytic recovery rate is greater than 90%.

In the cyanide leaching of gold and silver, special resins are used to adsorb gold and silver in the form of cyanide complex anions from the pulp or cyanide leachate. Gold and silver can be selectively recovered using a special eluent, or they can be directly incinerated to obtain elemental gold and silver.

The molybdic acid leaching solution is obtained by oxidizing and acid leaching high-temperature alloy waste. Adsorption is used to selectively extract molybdenum from the molybdic acid leaching solution. Then, the molybdenum is desorbed using a mixed solution of ammonia water and ammonium chloride. The obtained ammonium molybdate solution is evaporated, concentrated, cooled, and crystallized to obtain white ammonium molybdate crystals, effectively recovering molybdenum from the acid leaching solution.

Special adsorbents can selectively remove arsenic from mine pit wastewater, widely applicable to the treatment and discharge of wastewater that meets standards and to the water reuse section.

In smelting processes where extraction technology is applicable, a small amount of extractant often remains in the aqueous phase in an oil phase state. Specialized adsorbents can deeply separate oil and water, recovering organic solvents (extractants, kerosene) lost in the aqueous phase. Temperature-controlled desorption extracts trace amounts of organic solvents.

Selective recovery of tungsten from mica ore:

Mica leaching brine contains approximately 200-500 mg/L of tungsten. Considering that traditional defluorination technologies cannot effectively recover and utilize tungstate, a specialized adsorbent selectively extracts tungstate, and it is recovered as a byproduct in the form of calcium tungstate or iron tungstate, creating significant additional economic value, with an estimated additional benefit of no less than 50 million yuan annually.

Defluorination before evaporation and concentration:

The high fluoride ion concentration in the leaching solution places high demands on the corrosion resistance of downstream equipment. Therefore, selective removal of fluoride ions effectively protects downstream stainless steel pipelines and equipment, significantly reducing project investment and operating costs.

Calcium and magnesium removal after concentration:

A secondary deep purification process for the concentrated lithium-rich solution significantly improves the quality of lithium precipitation, improves lithium salt purity, and is a prerequisite for preparing electronic-grade lithium carbonate products.