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A treatment method for comprehensive utilization of quartz sand pickling cycle

A treatment method, the technology of quartz sand, applied in the direction of silica, silicon oxide, etc., can solve the problems of complex pickling process, unfavorable cost, environmental pollution, etc., achieve the effect of simple process, reduce production cost, and increase economic benefits

Active Publication Date: 2016-08-24
临沂晟泉矿业有限公司 +1
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If the waste acid after pickling is discharged directly, it will cause serious environmental pollution and is not conducive to cost saving
At the same time, the acid used in the existing process of preparing quartz sand is a mixed acid of various acids, which is troublesome to prepare; the pickling process is complicated and the iron content in the final finished quartz sand is relatively high

Method used

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Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0026] The process steps include: acid leaching—first centrifugation (sand acid separation)—sealing oxidation—neutralization—first cleaning—second centrifugation—second cleaning of quartz sand—drying—finished product, the specific steps are as follows: :

[0027] ① Acid leaching: Put the quartz sand with suitable particle size obtained through the previous process into the acid leaching tank, add hydrochloric acid with a concentration of 18%, the mass ratio of quartz sand to hydrochloric acid is 1:0.4, and then heat to 65°C Processed for 2.5 hours.

[0028] ②The first centrifugation: the quartz sand acid-leached in step 1 is centrifuged through a centrifuge to separate the sand and acid, and the separated hydrochloric acid is returned to the acid leaching tank in step 1 for reuse. At the same time, the centrifuged Quartz sand containing about 10% hydrochloric acid is used for sealing oxidation.

[0029] ③ Sealed oxidation: Add H with strong oxidation effect to the acid leach...

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Abstract

The invention discloses a quartz sand pickling comprehensive recycle method. The quartz sand pickling comprehensive recycle method comprises the following steps: pickling, first centrifuging (sand and acid separation), sealing and oxidizing, neutralizing, first cleaning, second centrifuging, second cleaning quartz sand, drying, and obtaining a finished product, wherein most of waste hydrochloric acid produced during the primary centrifugation (sand and acid separation) returns to a pickling pool and is recycled; displacement reaction is preformed on calcium chloride and sulfuric acid which are produced during the secondary centrifugation to produce hydrochloric acid and calcium sulfate; the produced hydrochloric acid returns to the step 1 and is recycled; a produced calcium sulfate by-product can be used as a cement additive. In the whole process, no waste water, waste gas and waste solid are discharged, so that the quartz sand pickling comprehensive recycle method is energy-saving and environment-friendly.

Description

technical field [0001] The invention relates to the technical field of purification, processing and production of quartz sand, in particular to an environment-friendly pickling cycle treatment method for quartz sand. Background technique [0002] In recent years, high-purity quartz sand has been gradually introduced into high-tech industries such as lasers, semiconductors, and microelectronics, and the separation and purification of quartz sand has attracted more and more attention. Since the surface layer of the freshly mined quartz stone adheres to impurities such as iron, aluminum, phosphorus, titanium, potassium, calcium, etc., which seriously affects the purity and quality of the product, the impurity removal process of quartz stone is a key part of the quartz sand production process. The purification of quartz sand to a higher purity requires a series of complicated separation processes. However, the magnetic separation process often cannot completely remove the iron-c...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B33/12
Inventor 赵祥国洪光
Owner 临沂晟泉矿业有限公司