Mineral Solution

Silica powder is dust recovered from the smelting of metallic silicon or ferrosilicon alloys. Its primary component is silicon dioxide. As an important inorganic non-metallic material, silica powder possesses excellent physical and chemical properties, including small particle size, light weight, large specific surface area, and high refractoriness. It is widely used in rubber, ceramics, refractories, chemicals, concrete, and other fields.

Quartz pickling is the core process of quartz sand purification. It dissolves metal oxides, silicates and other impurities with acid to significantly improve the purity of silicon dioxide (up to 99.7% or more), meeting the needs of high-end fields such as photovoltaic glass, semiconductors, and high-purity quartz.

Process selection suggestions
● Ordinary impurity removal (SiO₂＞94%): simple pickling with hydrochloric acid/sulfuric acid (24-hour immersion);
● High purity requirements (SiO₂＞99.7%): mixed acid (HF system) + adsorbent circulation technology + PPH equipment;
● Environmental protection priority: oxalic acid-ammonium bifluoride system + zero waste liquid discharge design.

Current technology has broken through the bottleneck of traditional pickling efficiency. The future direction focuses on low-temperature catalytic acidolysis (such as Fe²⁺-catalyzed oxalic acid) and fully enclosed automated production lines to further reduce energy consumption and risks.