Mineral pickling production line

Process Description

• 01

  Feed Preparation

  Quartz sand/powder after crushing, grinding (usually grinding to the target particle size, such as 40-200 mesh), and preliminary magnetic separation to remove iron. The higher the purity of the raw material (SiO₂ >99.5%), the better the pickling effect and the lower the acid consumption. Remove dust and soluble salts attached to the surface of the raw material.

• 02

  Acid Leaching/Washing

  Add the pretreated quartz sand/powder to the reactor with acid solution (solid-liquid ratio is the key parameter, usually 1:1 to 1:3). Continuous stirring ensures that the particles are fully in contact with the acid solution to prevent sedimentation and agglomeration. The temperature is usually controlled at 60°C - 95°C. High temperature can greatly shorten the reaction time (several hours to more than ten hours) and improve the impurity removal rate.

• 03

  Acid Separation & Waste Acid Treatment

  After the reaction, separate the acid solution from the quartz particles. Drain the waste acid solution as much as possible to reduce the residual acid entering the water washing system. For waste acid with relatively low impurity content, evaporation concentration, extraction, ion exchange and other methods can be considered to recover part of the acid (especially hydrochloric acid).

• 04

  Washing/Rinsing

  To completely remove the acid and dissolved metal ions remaining on the surface and pores of the quartz particles. Usually 5-10 or even more rinses are required. The most water-saving method is to add new water from the last stage, overflow forward step by step, and discharge dirty water from the first stage. The discharged dirty water can be used for front-end cleaning or waste acid treatment system.

• 05

  Drying

  Dry the dehydrated wet sand to a very low moisture content (usually <0.1%) to meet the requirements of subsequent processing or packaging. You can choose our single-drum dryer or three-drum dryer, equipped with a water bath dust removal system, which can effectively avoid dust generated during the drying process.

SUCCESSFUL CASE