How to Manage Gold Tailings Re-processing Line to Recover Quartz Sand
Shandong Xinhai Mining Technology & Equipment Inc.
Xinhai provides ore processing plant and full set equipment: Ball mill, Hydrocyclone, Flotation, Washing plant, CIP, CIL
Gold tailings, also known as gold mine tailings, are the residue left over from the process of extracting gold from ore. The tailings usually contain a large amount of quartz sand, which can be recycled and used in various industries. However, the recovery rate of quartz sand from gold tailings is relatively low, and different methods have been developed to improve the recovery rate. In this article, we will discuss several methods for recycling quartz sand from gold tailings， including: Hydrofluoric Acid Flotation Method, Non-Fluorine Acid Flotation Method, Neutral Medium Flotation Method, and Alkaline Medium Flotation Method.
Hydrofluoric Acid Flotation Method
The hydrofluoric acid method is a commonly used method for recycling quartz sand from gold tailings. The process involves using hydrofluoric acid to dissolve the quartz sand , leaving behind the gold and other heavy metals.
When hydrofluoric acid is added to the pulp, as the PH value of the pulp decreases, the dissociation balance between quartz and feldspar surface in the pulp is broken, and the H+ concentration increases, which moves the dissociation balance to the direction of decreasing negative charge. When the value is 2 to 3, the surface potential of quartz is controlled to be close to 0. Due to the corrosion of the silicon-oxygen (Si-O) bond by HF (hydrogen fluoride) acid, the Al3+ on the surface of the feldspar protrudes and becomes an active center. Quickly form [SiF6]2- complex ions, and form stable complexes with Al3+, K+, Na+ on the surface of feldspar, attach to the surface of feldspar, make the surface of feldspar negatively charged, and then add cationic amine collectors, It will be electrostatically adsorbed on the surface of feldspar, making the surface of feldspar hydrophobic to achieve reverse flotation of quartz .
The resulting solution is then treated to recover the quartz sand . However, this method is highly toxic and requires careful handling.
Non-Fluorine Acid Flotation Method
The non-fluorine acid method is a safer alternative to the hydrofluoric acid method. This method involves using non-fluorine acid, such as sulfuric acid, to dissolve the quartz sand .
Under strong acid, H2SO4 (sulfuric acid) or HCl (hydrogen chloride) is used as a PH regulator to move the dissociation balance of the feldspar surface to the direction of negative charge reduction in the slurry with a PH value of 2 to 3, so that the quartz surface uncharged, while the gap-balanced metal ions K+ or Na+ in the Al3+ region of the feldspar lattice are dissolved in the slurry, making the surface of the feldspar negatively charged, and then using amine cationic collectors to first adsorb the negative charge on the surface of the feldspar area, and then use petroleum sulfonate as an anion collector, which is complexed with the adsorbed amine collector and adsorbed on the surface of feldspar together, so that the adsorption amount of the collector on the surface of feldspar is larger than that of quartz , so that the feldspar preferentially emerges and separates from quartz .
The dissolved quartz sand is then recovered using a process similar to the hydrofluoric acid method. This method is less toxic but may require more time and energy to complete.
Neutral Medium Flotation Method
This method is a flotation method that uses a neutral medium, such as water, to float the quartz sand . Generally, in neutral medium, both quartz and feldspar are negatively charged, and amine cations can be used to collect Al micro-regions on the surface of feldspar to form characteristic adsorption, and then combined with oleate ion anion collectors to form hydrophobic molecular micelles , improve the adsorption capacity of the feldspar surface, float out the feldspar, and realize quartz reverse flotation .
This method is effective for recovering large quantities of quartz sand from gold tailings. However, the recovery rate may be lower than other methods.
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Alkaline Medium Flotation Method
The alkaline medium flotation method is a flotation method that uses an alkaline medium, such as sodium hydroxide, to float the quartz sand . When the PH value is 11-12, add 1-dodecanol, 1,8-octaalkyldiamine and other flotation agents to make the pulp form neutral complexes, which will interact with free. The sulfonate ions are combined and adsorbed on the surface of the quartz together, acting as a semi-micelle accelerator, making the quartz hydrophobic and floating, thereby realizing the separation of quartz and feldspar.
This method is effective for recovering a high recovery rate of quartz sand from gold tailings. However, the alkaline medium may cause the formation of foam, which can reduce the efficiency of the process.
In conclusion, there are several methods available for recycling quartz sand from gold tailings. Each method has its advantages and disadvantages, and the choice of method depends on the specific circumstances. It is important to carefully consider the safety, efficiency, and effectiveness of each method before selecting a method for recycling quartz sand from gold tailings. By selecting a suitable process, we can improve the recovery rate of quartz sand and reduce the waste of resources.
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