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Method for preparing ultralow-metallic-element ultrahigh-purity quartz through mixed acid hot-pressing leaching reaction

A hot-pressing leaching, metal element technology, applied in the direction of silicon dioxide, silicon oxide, etc., can solve the problems of limited reserves and uneven distribution of high-quality quartz resources, and achieve the effect of increasing the contact surface area

Active Publication Date: 2014-01-29
陕西合兴硅砂有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, high-quality quartz resources are not evenly distributed around the world and reserves are limited

Method used

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  • Method for preparing ultralow-metallic-element ultrahigh-purity quartz through mixed acid hot-pressing leaching reaction

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0058] (1) Crushing and grading

[0059] The vein quartz raw ore is crushed and graded to prepare vein quartz sand with a particle size of 96-212 μm, and the vein quartz sand SiO 2 The purity is 99.8-99.9%, and the content of impurity metal elements: Al20-160μg·g -1 , Fe10~210μg·g -1 , Ti6~35μg·g -1 , Ca5~70μg·g -1 , Mg0.5~20μg·g -1 , Li2~15μg·g -1 , Na15~75μg·g -1 , K15~75μg·g -1 ;

[0060] (2) Magnetic separation

[0061] The sample obtained in step (1) is subjected to high-gradient pulsating strong magnetic separation under the conditions of pulp concentration of 35wt%, magnetic field strength of 0.8T, and pulsation intensity of 200r / min, and non-magnetic products are dried for use;

[0062] (3) Three-stage priority reverse flotation

[0063] Reverse flotation of the non-magnetic product obtained in step (2), the three-stage preferential reverse flotation refers to: one-stage reverse flotation to separate iron minerals, after drug removal, second-stage reverse flo...

Embodiment 2

[0073] (1) Crushing and grading

[0074] The vein quartz raw ore is crushed and graded to prepare vein quartz sand with a particle size of 96-212 μm, and the vein quartz sand SiO 2 The purity is 99.8-99.9%, and the content of impurity metal elements: Al20-160μg·g -1 , Fe10~210μg·g -1 , Ti6~35μg·g -1 , Ca5~70μg·g -1 , Mg0.5~20μg·g -1 , Li2~15μg·g -1 , Na15~75μg·g -1 , K15~75μg·g -1 ;

[0075] (2) Magnetic separation

[0076] The sample obtained in step (1) is subjected to high-gradient pulsating strong magnetic separation under the conditions of pulp concentration of 35wt%, magnetic field strength of 1.2T, and pulsation intensity of 300r / min, and non-magnetic products are dried for use;

[0077] (3) Three-stage priority reverse flotation

[0078] Reverse flotation of the non-magnetic product obtained in step (2), the three-stage preferential reverse flotation process is: one stage of reverse flotation to separate iron minerals, after drug removal, the second stage of re...

Embodiment 3

[0088] (1) Crushing and grading

[0089] The vein quartz raw ore is crushed and graded to prepare vein quartz sand with a particle size of 96-212 μm, and the vein quartz sand SiO 2 The purity is 99.8-99.9%, and the content of impurity metal elements: Al20-160μg·g -1 , Fe10~210μg·g -1 , Ti6~35μg·g -1 , Ca5~70μg·g -1 , Mg0.5~20μg·g -1 , Li2~15μg·g -1 , Na15~75μg·g -1 , K15~75μg·g -1 ;

[0090] (2) Magnetic separation

[0091] The sample obtained in step (1) is subjected to high-gradient pulsating strong magnetic separation under the conditions of pulp concentration of 35wt%, magnetic field strength of 1.2T, and pulsation intensity of 300r / min, and non-magnetic products are dried for use;

[0092] (3) Three-stage priority reverse flotation

[0093] Reverse flotation of the non-magnetic product obtained in step (2), the three-stage preferential reverse flotation process is: one stage of reverse flotation to separate iron minerals, after drug removal, the second stage of ...

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Abstract

The invention relates to a method for preparing ultralow-metallic-element ultrahigh-purity quartz through mixed acid hot-pressing leaching reaction. The method is characterized by comprising the following steps of crushing and classifying; performing magnetic separation; performing three-section preferential reverse flotation; performing roasting and water quenching; performing hot-pressing leaching, namely putting a product of roasting and water quenching in a reaction kettle, and performing hot-pressing acid leaching reaction in a mixed acid system while stirring, wherein the reaction temperature is 120-400 DEG C, the reaction pressure is 0.5-15.0MPa, the reaction time is 0.5-8h, and the mixed acid system for the hot-pressing leaching chemical reaction is a mixed solution of HF, HNO3 and HCl; after hot-pressing acid leaching, filtering and washing the product until the product is neutral, and drying to obtain the ultralow-metallic-element ultrahigh-purity quartz. The purification method is simple in process and easy to operate; the ultralow-metallic-element ultrahigh-purity quartz of which the SiO2 content reaches 99.995wt%, preferably 99.999wt%, can be prepared by the method.

Description

technical field [0001] The invention belongs to the technical field of purification of inorganic non-metallic materials, and in particular relates to a method for reducing Al, Fe, Ti, Ca, Mg, K, Na and other metal elements in vein quartz by a method of mixed acid hot-press leaching to prepare ultra-low metal element super High purity quartz method. Background technique [0002] The preparation of ultra-low metal ultra-high purity quartz sand is a research hotspot in the field of high-tech inorganic materials in the 21st century, especially quartz sand with low content of aluminum, iron, titanium, alkali metals, and alkaline earth metal elements has become a strategic reserve resource. At present, some countries have restricted the export of primary and secondary crystal raw materials, and the preparation of ultra-high-purity quartz materials with ultra-low metal elements is regarded as confidential. Ultra-low impurity metal element ultra-high purity quartz materials are wid...

Claims

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Application Information

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IPC IPC(8): C01B33/12
Inventor 雷绍民钟乐乐裴振宇黄冬冬马球林杨亚运
Owner 陕西合兴硅砂有限公司
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