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Method for preparing water glass through extracting silicon oxide from chrysotile tailings by strong-base roasting method

A technology of chrysotile and water glass, which is applied in the field of extracting silicon oxide from chrysotile tailings to prepare water glass, achieving the effects of short roasting time, short process flow and low energy consumption

Active Publication Date: 2016-04-20
SOUTHWEAT UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] So far, there have been no relevant reports on the successful preparation of water glass by extracting silica components from chrysotile tailings by strong alkali roasting

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0035] 1) Take the raw material of chrysotile tailings and carry out crushing and ball milling by conventional methods to obtain 60 mesh chrysotile tailings powder; the SiO of chrysotile tailings powder 2 The mass percentage is 40%;

[0036] 2) add strong base in the chrysotile tailings powder that step 1) obtains, and this strong base selects sodium hydroxide for use; Chrysotile tailings powder and sodium hydroxide are according to SiO 2 / NaOH molar ratio is 1:6 and weighed, put it into a conventional container with a stirring device and mix it evenly, then put it in a heating furnace, and roast it at 600°C for 4 hours, and obtain sodium silicate-containing water glass after the reaction active roasting products;

[0037] 3) Soak the active roasted product obtained in step 2) and industrial water for 20 minutes according to the ratio of 1:30, obtain the sodium water glass filtrate after pressure filtration with a filter press, and wash the filter residue until neutral to obt...

example 2

[0041] 1) Crushing and ball milling the chrysotile tailings to obtain 300-mesh mineral powder, the chrysotile tailings powder contains SiO 2 The mass percentage content is 35%;

[0042] 2) the chrysotile tailings and sodium hydroxide obtained in step 1) according to SiO 2 / NaOH molar ratio is 1:0.5 and weighed, put it into a container with a stirring device and mix it evenly, and put it in a heating furnace, and roast the mixed material at a reaction temperature of 1000°C for 0.5h, and obtain silicic acid after the reaction Active calcined product of sodium silicate;

[0043] 3) Soak the active roasted product obtained in step 2) and industrial water at a ratio of 1:10 for 2 hours, obtain a sodium water glass filtrate after pressure filtration with a filter press, and wash the filter residue until neutral to obtain a filter cake containing magnesium oxide;

[0044] 4) The sodium water glass filtrate obtained in step 3) is selected from a pressure spray dryer, and the sodium ...

example 3

[0047] 1) Crushing and ball milling the chrysotile tailings raw materials to obtain 100-mesh mineral powder, the SiO contained in the chrysotile tailings powder 2 The mass percentage is 45%;

[0048] 2) the chrysotile tailings powder obtained in step 1) and potassium hydroxide are mixed according to SiO 2 The / KOH molar ratio is 1:3 and weighed, put it into a container with a stirring device and mix it evenly, and put it in a heating furnace. The mixed material is roasted and reacted for 2.5 hours at a reaction temperature of 250 ° C. After the reaction, silicic acid is obtained. Active calcined product of potassium silicate;

[0049] 3) Soak the active roasted product obtained in step 2) and industrial water at a ratio of 1:5 for 1.0 h, filter through a filter press to obtain potassium silicate water glass filtrate, wash the filter residue until neutral to obtain a filter cake containing magnesium oxide ;

[0050] 4) the potassium water glass filtrate obtained in step 3) i...

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Abstract

The invention discloses a method for preparing water glass through extracting silicon oxide from chrysotile tailings by a strong-base roasting method. The method comprises the following steps: (1) carrying out processing, so as to obtain chrysotile tailing powder; (2) adding a strong base into the chrysotile tailing powder, carrying out uniform mixing, and carrying out a roasting reaction, so as to obtain a water glass containing active roasted product, wherein the strong base is sodium hydroxide or potassium hydroxide, and the chrysotile tailing powder and the strong base are weighed in a mole ratio of SiO2 to (Na / K) being (1: 0.5) to (1: 6); (3) proportioning the active roasted product and industrial water in a solid-liquid mass ration of being (1: 5) to (1: 30), and carrying out a water soaking reaction for 20 minutes to 2 hours, so as to obtain a water glass containing suspension; (4) subjecting the suspension obtained in the step (3) to filtrating and dehydrating, so as to obtain a water glass filtrate and filtrated residue; (5) subjecting the water glass filtrate to spray drying, thereby obtaining the water glass. According to the method, the strong base serves as a chemical adjuvant and reacts with silicon oxide in the chrysotile tailings, and then, leaching is carried out so as to prepare the water glass, thus, the process flow and roasting time are short, the energy consumption is low, and the method is green and environmentally friendly and is beneficial to popularization and application.

Description

technical field [0001] The invention relates to a method for preparing water glass by extracting silicon oxide from chrysotile tailings, especially a method for preparing water glass by extracting silicon oxide from chrysotile tailings by a strong alkali roasting method; it belongs to the comprehensive utilization of chrysotile tailings resources , Solid waste treatment, material processing and environmental protection. Background technique [0002] The mineral composition of chrysotile tailings mainly includes chrysotile short fibers, chrysotile, antigorite and lizardite, etc., and contains a small amount of magnetite, talc, dolomite, brucite, calcite, etc.; The chemical composition is SiO 2 , MgO, and a small amount of Fe 2 o 3 , NiO, Cr 2 o 3 Wait. [0003] Water glass is a kind of water-soluble silicate, sodium water glass is more common, usually with quartz powder (SiO 2 ) mixed soda ash (Na 2 CO 3 ), melted at a high temperature of 1300-1400 ° C to form liquid...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B33/32C01F5/14C01F5/24C01F5/08
CPCC01B33/32C01F5/08C01F5/14C01F5/24
Inventor 孙红娟彭同江宋鹏程余玉操
Owner SOUTHWEAT UNIV OF SCI & TECH
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