Method and device for continuous acid pickling purification of quartz sand

Abstract

The invention provides a method for continuous acid pickling purification of quartz sand. The method comprises the steps of heating, material loading, acid pickling, deacidifying, water washing, acid recovering and tail gas treatment. The invention also provides a device for implementing the method to perform continuous acid pickling purification on quartz sand; the device comprises a heating unit, a storage unit, a drum mixer, a water washing unit, an acid recovery unit and a water-jet vacuum unit; spiral line plates are arranged on the inner wall of a drum of the drum mixer, 20-60 lifting plates are mounted between two adjacent spiral line plates, two adjacent lifting plates and the spiral line plates on the two sides thereof are combined to form a lifting bucket, a driven gear is arranged on the outer wall of the drum of the drum mixer in a sleeved manner, a charging opening and a discharging opening are formed in the two ends of the drum, and spiral line plates are mounted on the inner walls of both of the charging opening and the discharging opening. The method and the device are capable of realizing sufficient acid pickling purification of the quartz sand by virtue of continuous automatic feeding, turning over and discharging of the quartz sand and acid liquor; as a result, the production efficiency and the quality of product are improved, and the acid is recycled and absorbed by use of alkaline so that the production cost is reduced, and meanwhile, the environmental pollution is reduced.

Description

technical field [0001] The invention relates to a method and device for continuous pickling and purification of quartz sand. The invention belongs to the technical field of non-metallic ore deep processing. Background technique [0002] After the quartz sand is purified by pickling, the content of metal impurities represented by iron is greatly reduced, and its purity is significantly improved. According to the purity of the purified quartz sand, it is used for optical glass, crystal glass and accessories, electronic glass, liquid crystal glass substrate, ordinary quartz glass, high-purity quartz glass, semiconductor quartz glass tube, solar polysilicon, and quartz crucible for monocrystalline silicon. , electronic potassium silicate solution, high-purity sodium silicate solution and silica powder, high-purity, high-quality white carbon black and other materials. [0003] At present, there are two commonly used methods for pickling and purifying quartz sand. The quartz san...

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Problems solved by technology

[0004] The disadvantages of the above two production methods are: both are intermittent production, which affects production efficiency; simply soaking in acid solution cannot completely remove the metal impurities on the surface of the quartz sand, and the purification effect of the quartz sand is poor.

[0005] Moreover, for the devices implementing the above two production methods, each equipment is separated from each other, and the equipment is simple and backward, which greatly increases the labor intensity of the workers; because the pickling container is stationary during the pickling process, it is difficult to mix the quartz sand with the acid solution to fully react. Unstable product quality and low production efficiency

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