Quartz sand pickling purification processing technology

A processing technology, quartz sand technology, applied in water/sludge/sewage treatment, water pollutants, water/sewage treatment, etc., can solve the problem of low heating efficiency, reduce energy consumption, save feeding time, reduce cost effect

Active Publication Date: 2020-09-15
合肥诺玛非金属矿科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

During the transportation process, the acid is often heated by a heat exchanger, which has the problems of low heating efficiency and the need for continuous circulation of the acid solution

Method used

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  • Quartz sand pickling purification processing technology

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Effect test

Embodiment 1

[0030] The quartz sand pickling and purification process of the present invention is used to produce 15ppm high-purity quartz sand in Hubei Damei Silicon Industry Technology Co., Ltd., and the specific steps include:

[0031] Use the loader 1 to add 60ppm of quartz sand raw material into the pickling tank 2 through the belt conveyor (the process takes 45min), and then add the 60ppm quartz sand raw material to the pickling tank 2 and preheat it to 75°C in advance through the steam coil 14. The concentration is 0.5 Mixed hot acid 15 of % hydrofluoric acid + 6% oxalic acid (hydrofluoric acid: oxalic acid = 1:10 (v / v), the acid addition process takes 30 minutes), pickling in pickling tank 2 for 18 hours and then discharging the acid After 3 hours of recovery, the recovery rate is about 92%;

[0032] The recovered acid is discharged to the acid liquid circulation tank 3 through a vacuum pump for use; then, clean water is added to the pickling tank 2 to discharge the quartz sand thr...

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Abstract

The invention discloses a quartz sand pickling purification processing technology, which comprises the following steps: heating oxalic acid and hydrofluoric acid solutions with prepared concentrationsto 75 DEG C, conveying the oxalic acid and hydrofluoric acid solutions to 1/3 volume in a reaction tank, adding quartz sand to be processed into the reaction tank, and supplementing acid liquor untilthe quartz sand is completely covered; recovering the acid liquor when the materials react to the target taste in the reaction tank; and after the acid liquor is recycled, performing steps of sand discharging, cleaning, dewatering and warehousing. According to the quartz sand acid pickling purification processing technology, acid does not need to be added from the bottom of the reaction tank, meanwhile, acid does not need to overflow, the feeding time is saved, energy consumption during acid adding is reduced, the structure of the reaction tank is also simplified (an overflow device is not needed), and the cost is reduced.

Description

technical field [0001] The invention relates to a processing technology for pickling and purifying quartz sand. Background technique [0002] Generally, low-grade quartz sand can be purified by pickling to obtain high-grade quartz sand. According to different raw materials, different grades of quartz sand can be produced, such as photovoltaic glass sand, photoelectric glass sand, optical glass sand, process glass sand, and various plates. Sand, sand for various grades of silica powder, etc. [0003] The existing pickling process mainly uses reaction tanks or pickling tanks to soak in acid solutions such as hydrochloric acid, fluosilicic acid, nitric acid, oxalic acid, etc., with or without heating as required. The conventional pickling process steps mainly include: adding raw materials to the reaction tank, and then transporting the acid from the bottom to overflowing from the top of the reaction tank. During the transportation process, the acid is often heated by a heat e...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B33/12C02F9/04C02F101/14
CPCC01B33/12C02F9/00C01P2006/80C02F1/72C02F1/66C02F1/5245C02F1/56C02F1/5236C02F2101/14
Inventor 王成何伟伟
Owner 合肥诺玛非金属矿科技有限公司
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