Quartz sand purification system without washing procedure

Abstract

The present invention discloses a quartz sand purification system without the washing procedure. The quartz sand purification system without the washing procedure comprises an acid pickling device, a filtering device, a drying device and a finish machining device, and quartz sand materials are sequentially transferred among the acid pickling device, the filtering device, the drying device and the finish machining device; the drying device comprises a fluidized bed dryer, a material inlet of the fluidized bed dryer is connected with a stock bin, and a material outlet is connected with a collecting bin. A hot air inlet of the fluidized bed dryer is sequentially connected with a heating furnace, an air blower and an air filter, a hot air outlet is sequentially connected with a cooler, a multi-stage dust removal device, a multi-stage water absorption device and an acid mist absorption tower through pipelines, and a gas outlet of the acid mist absorption tower is communicated with the atmosphere. According to the invention, deacidification in a washing process can be satisfied, a large amount of environmental protection and production investment are saved, water and wastewater treatment operation cost is saved, production cost is reduced, and an impurity removal effect can be further achieved in a fluidized bed drying process.

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, my country's quartz sand purification process is inseparable from the basic processes of pickling and purifying quartz sand, deacidification, water washing, and dehydration. Especially: in the pickling process, in order to improve the obvious pickling effect, everyone uses acid solutions such as hydrochloric acid + fluorine-containing acid or fluorine-containing acid + oxalic acid to carry out warming pickling, and then remove the acid solution after pickling, and use The recovered water after recycling treatment is washed, and then the dehydrated quartz sand is dried, cooled, magnetically separated, screened, color sorted, packaged and other processes to make diffe...

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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