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Environment-friendly quartz sand purification process

A kind of quartz sand, environmental protection technology, applied in the direction of silicon dioxide, silicon oxide, etc., can solve the problem of high cost of waste liquid treatment, achieve excellent iron removal rate, reduce the possibility of hydrolysis to form silicon dioxide precipitation, and reduce waste of resources. Effect

Pending Publication Date: 2021-10-08
深圳市考拉生态科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In order to improve the problem of high cost of waste liquid treatment when the quartz sand is purified by pickling, this application provides an environment-friendly purification process for quartz sand, which adopts the following technical scheme:

Method used

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  • Environment-friendly quartz sand purification process
  • Environment-friendly quartz sand purification process
  • Environment-friendly quartz sand purification process

Examples

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Effect test

Embodiment 1

[0069] refer to figure 1 , an environment-friendly quartz sand purification process, comprising the following steps:

[0070] Alkali leaching: Stir and mix 1000kg dry weight of quartz sand minerals and 1000kg mass percentage concentration of 20% sodium hydroxide solution together, and raise the temperature to 90°C, stir and react at 90°C for 3 hours to obtain a solid-liquid mixture , wherein the yield of particles with a particle size of less than 0.074mm in quartz sand minerals is 8.87%.

[0071] Filtration: Centrifuge the solid-liquid mixture with filtration equipment to obtain filter residue and filtrate I.

[0072] Rinse: rinse the filter residue with water until the pH value of the rinse water is 7 to obtain the finished quartz sand and rinse water I.

[0073] Classification: Screen the finished quartz sand after rinsing into two specifications of particle size 1.0mm two kinds of particle size, >1.0mm particle size quartz sand is quartz sand product I, 0.074-1.0mm parti...

Embodiment 2

[0081] An environment-friendly quartz sand purification process, comprising the following steps:

[0082] Alkali leaching: Stir and mix 1000kg dry weight of quartz sand minerals and 1500kg mass percentage concentration of 30% sodium hydroxide solution together, and raise the temperature to 100°C, stir and react at 100°C for 3 hours to obtain a solid-liquid mixture , wherein the yield of particles with a particle size of less than 0.074mm in quartz sand minerals is 9.89%.

[0083] Filtration: Centrifugal filtration of solid-liquid mixture with filtration equipment to obtain filter residue.

[0084] Rinse: rinse the filter residue with water until the pH value of the rinse water is 8 to obtain the finished quartz sand.

[0085] Classification: Screen the finished quartz sand after rinsing into two specifications of particle size 1.0mm two kinds of particle size, >1.0mm particle size quartz sand is quartz sand product I, 0.074-1.0mm particle size quartz sand is quartz sand product...

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Abstract

The invention discloses an environment-friendly quartz sand purification process which comprises the following steps of: stirring and mixing quartz sand minerals and a strong alkali solution for reaction, filtering to obtain filter residues and filtrate I, leaching the filter residues with water until the pH value is 7-8 to obtain finished quartz sand and leaching water I, screening out the quartz sand with the size fraction of less than 0.074 mm in the finished quartz sand, carrying out flotation treatment, mixing the filtrate I with the leaching water I, adding strong acid till the pH value is smaller than 1, adding alkali liquor into the mixed liquor in batches for precipitation and separation to obtain a recovery product, and heating and evaporating residual liquor to obtain crystals, the yield of quartz sand with the size fraction smaller than 0.074 mm in quartz sand minerals being 10% or below. By utilizing the characteristic that the strong alkali solution is not volatile, the process has no influence on the human body and the environment during industrial application. The whole production process flow does not generate three wastes, so that the production cost is low, and the economic benefit is huge.

Description

technical field [0001] The application relates to the field of quartz sand preparation, and more specifically, relates to an environment-friendly purification process of quartz sand. Background technique [0002] The main mineral component of quartz sand is SiO 2 , is a hard, wear-resistant, chemically stable silicate mineral that has been widely used in many fields. Quartz sand often contains some associated aluminosilicate minerals such as feldspar and mica and iron-containing substances. Iron mainly exists in quartz sand in the form of disseminated iron and wrapped iron. Disseminated iron is micron-scale clay iron-containing substances immersed in the cracks of quartz particles and iron ions permeated into the surface lattice of quartz particles. Encapsulated iron is usually clay iron-containing substances wrapped and adsorbed on the surface of quartz particles. [0003] Quartz sand needs to be purified before it is applied to the industry to meet the high-purity requir...

Claims

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Application Information

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IPC IPC(8): C01B33/12
CPCC01B33/12C01P2006/80
Inventor 邵宗强李祖君蓝云燕
Owner 深圳市考拉生态科技有限公司
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