A quartz sand purification system without water washing process

Abstract

A quartz sand purification system without water washing process of the present invention comprises a pickling device, a filtering device, a drying device and a finishing device, and the quartz sand material is sequentially transferred between the four; the drying device includes a fluidized bed dryer, The material inlet of the fluidized bed dryer is connected to the silo, and the material outlet is connected to the collection bin; the hot air inlet of the fluidized bed dryer is connected to a heating furnace, a blower and an air filter in sequence, and the hot air outlet is connected to a cooler through a pipeline in sequence , a multi-stage dust removal device, a multi-stage water absorption device and an acid mist absorption tower, the gas outlet of the acid mist absorption tower is connected to the atmosphere. The present invention can satisfy the deacidification process of water washing, not only saves a large amount of environmental protection and production investment, but also saves water and wastewater treatment operation costs, reduces production costs, and can further play a role in deacidification during the fluidized bed drying process. mixed effect.

Description

technical field [0001] The invention relates to an equipment system for a quartz sand purification process without water washing process, and belongs to the technical fields of inorganic chemical industry, energy saving and environmental protection and waste utilization. Background technique [0002] At present, the purification process of quartz sand in my country is inseparable from the basic processes of acid washing, deacidification, water washing and dehydration of quartz sand. In particular: in the pickling process, in order to improve the obvious pickling effect, everyone uses acid solutions such as hydrochloric acid + fluoric acid or fluoric acid + oxalic acid for heating and pickling, and after pickling, the acid solution is removed. The recycled water after recycling is washed, and then the dehydrated quartz sand is dried, cooled, magnetically separated, screened, colored, and packaged to produce different grades of quartz sand products according to different custo...

AI Technical Summary

Problems solved by technology

According to the data accumulated in many years of production, for every ton of quartz sand product purified by pickling, the washing process will produce 4-10 tons of acid-containing wastewater, and the washing time will take about 0.5-1 hour, and some will take longer ; And it will cost a lot of money to build a set of huge water treatment facilities to deal with these acid-containing wastewater. This facility not only has high operating costs, but also produces a certain amount of toxic and harmful salt-containing waste residues

According to environmental protection laws and regulations, only after the treated wastewater reaches the national discharge standard can a small part of it, that is, about 10%, be discharged to the outside within the scope of the permit, and most of it, that is, about 90%, must be recycled. To strictly control the fluoride ions not to exceed the standard, a certain amount of calcium chloride solution needs to be added, so that there is often a certain amount of calcium chloride in the circulating water, which brings certain hidden dangers to the quality of quartz sand products

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