Pumps for Quartz Sand_Rubber-Lined Slurry Pumps in Quartz Sand Beneficiation Equipment

The primary slurry pump models used in quartz sand beneficiation include the 3/2C-AHR, 4/3C-AHR, and 6/4D-AHR, with rubber-lined slurry pumps being predominant.

Quartz sand beneficiation focuses primarily on purification, a technically challenging separation process aimed at removing minor or trace impurities from quartz sand to produce refined quartz sand or high-purity quartz sand. Common purification techniques employed domestically and internationally include: Washing, Classification & Desliming, Scrubbing, Magnetic Separation, Flotation, Acid Leaching, and Microbial Leaching.

Process Description

Washing & Classification/Desliming:
The SiO2 grade in quartz sand decreases as particle size becomes finer, while the grade of impurity minerals exhibits the opposite trend. This phenomenon is particularly pronounced in quartz sand containing significant amounts of clay minerals. Therefore, washing and desliming of the raw quartz sand ore prior to processing is essential.

Scrubbing:
Scrubbing utilizes mechanical force and the abrasive action between sand particles to remove film iron, argillaceous impurities, and further disintegrate mineral aggregates that haven't been fully liberated. Subsequent classification achieves further purification of the quartz sand. The primary methods currently employed are rod mill scrubbing and mechanical scrubbing.

Flotation:
Separating mica from quartz is challenging. Effective flotation can be achieved using either anionic collectors under acidic conditions, or hybrid anion-cation collectors under alkaline conditions. Generally, after undergoing scrubbing, desliming, magnetic separation, and flotation, the purity of quartz sand can exceed 99%, meeting the requirements for most industrial sand applications.

Acid Leaching:

Dilute acids are highly effective for removing iron and aluminum.

Removal of titanium and chromium requires leaching with stronger acids, such as concentrated sulfuric acid or aqua regia (a mixture of HNO3 + HCl).

Typically, mixed acids composed of the aforementioned types are used for leaching out impurity minerals.

Control parameters for acid leaching (acid concentration, temperature, dosage) should be optimized based on the final quartz purity requirement, aiming to minimize acid consumption, concentration, and temperature to achieve purification at a lower processing cost.

Post-Purification outcome, following this treatment, the chemical composition of the purified quartz sand meets the quality specifications of fused silica powder (SiO2 > 99%). After ultra-fine grinding (typically to -325 mesh), it can be utilized in industries such as ceramics, coatings, and metal casting.