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Process method for preparing high-purity quartz sand by taking cobblestones as raw materials

A technology of high-purity quartz sand and process method, applied in the direction of silicon dioxide, silicon oxide, etc., can solve the problems of complex mineral composition, difficult separation and purification, etc.

Active Publication Date: 2022-03-18
龙川县明昊石英新材料有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The main component of cobblestone is silica, but because of its complex mineral composition, including illite, tourmaline, feldspar, chlorite, garnet, olivine, etc., and ilmenite, etc., its separation and purification are very difficult

Method used

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  • Process method for preparing high-purity quartz sand by taking cobblestones as raw materials
  • Process method for preparing high-purity quartz sand by taking cobblestones as raw materials
  • Process method for preparing high-purity quartz sand by taking cobblestones as raw materials

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] The No. 1 cobblestone ore from Beihai Hejing Mining Company was used as the raw material, and the ICP test results are shown in Table 1 below.

[0025] The ICP test result of table 1 embodiment 1 raw ore

[0026]

[0027] 1. Sand making: washing and screening the pebbles, manual sorting to remove impurities, crushing, drying, and color sorting to remove the pure white pebbles after removing the variegated stones. Then carry out high-temperature calcination, water quenching, and air drying, and then carry out manual hand selection or color selection to remove particles containing variegated colors, then carry out sand making, magnetic separation, classification, and collect 70-120 mesh quartz sand, and then dehydrate for future use. As raw material quartz sand.

[0028] 2. Pickling and impurity removal: Put the obtained quartz sand into the reaction kettle, and then add 30% hydrochloric acid solution by mass percentage (m / m) for heating and pickling to remove the mec...

Embodiment 2

[0034] The No. 2 cobblestone ore from Beihai Hejing Mining Company was used as the raw material, and the ICP test results are shown in Table 2 below.

[0035] The ICP test result of table 2 embodiment 2 raw ore

[0036]

[0037] 1. Sand making: First wash, dry, and color-sort the pebbles to remove impurities, then crush, sand-making, magnetic separation, and classify to collect 40-70 mesh quartz sand, dry, and color-sort for later use.

[0038] 2. Pickling and impurity removal: send the obtained quartz sand into the pickling purification device, and then add (m / m) 31% hydrochloric acid acid solution for heating and pickling to remove the mechanical iron impurities brought in during the sand making process. When the acid solution is 85°C, start to keep warm for 3 hours, stop pickling and remove the acid solution, then raise the temperature in the container to 100°C, so that the hydrogen chloride gas in the acid solution remaining in the container can be quickly volatilized u...

Embodiment 3

[0044] The No. 3 cobblestone ore from Beihai Hejing Mining Company was used as the raw material, and the ICP test results are shown in Table 3 below.

[0045] The ICP test result of table 3 embodiment 3 ore

[0046]

[0047] 1. Sand making: First wash, dry, and color-sort the pebbles to remove impurities, then crush, sand-making, magnetic separation, and classify and collect 20-40 mesh quartz sand, dry, and color-sort for later use.

[0048] 2. Pickling and impurity removal: Put the quartz sand into the pickling purification container, and then add (m / m) 30% hydrochloric acid acid solution for heating and pickling to remove impurities. After stopping pickling and removing the acid solution, the temperature is raised to 105°C, so that the hydrogen chloride gas in the acid solution remaining in the kettle is quickly volatilized under the suction of the vacuum acid mist absorption device, and then rinsed with acetol to recover the solvent for later use.

[0049] 3. Removal of...

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Abstract

The invention relates to a process method for preparing high-purity quartz sand by using cobblestones as a raw material, which comprises the following steps of: preparing sand by using the cobblestones as the raw material to obtain raw material sand; the obtained raw material sand is subjected to normal-pressure acid pickling through concentrated hydrochloric acid, then high-pressure acid pickling is conducted through a hydrofluoric acid solution, then normal-pressure acid pickling is conducted through concentrated hydrochloric acid, high-purity carbon powder or silicon carbide is mixed into the obtained quartz sand, the mixture is fed into a chlorination device made of quartz glass for chlorination, and finally the high-purity quartz sand powder with the SiO2 content being 99.99% or above can be obtained.

Description

technical field [0001] The invention relates to a high-purity quartz sand preparation process and method, and belongs to the technical field of non-metallic ore deep processing. Background technique [0002] Currently preparing SiO 2 Purity ≥ 99.99% Quartz sand mainly depends on high-purity vein quartz or high-purity quartzite ore as raw material, high-purity vein quartz and SiO contained in quartzite 2 High purity and less metal impurities can greatly reduce the difficulty of impurity removal in the purification process. However, my country's vein quartz or quartzite mineral resources are not rich, which largely restricts the development of high-purity quartz sand industry. [0003] Pebbles are named for their resemblance to cobblestones. As a pure natural stone, pebbles are taken from the sand and gravel mountains formed by the uplift of the ancient riverbed after the crustal movement thousands of years ago. During the vicissitudes and evolution of hundreds of millions...

Claims

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Application Information

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IPC IPC(8): C01B33/18
CPCC01B33/18C01P2006/80
Inventor 田辉明杜德明陈灿星
Owner 龙川县明昊石英新材料有限公司
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