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Process for preparing high-whiteness composite calcium silicate by using quartz sand

A technology of calcium silicate and quartz sand, applied in the direction of silicate, alkaline earth metal silicate, etc., can solve the problems of narrow application area of ​​composite calcium silicate, reduce the pH value of composite calcium silicate, etc., and achieve a wide range of suitable, Improved quality and low energy consumption

Pending Publication Date: 2021-06-04
宣全
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a process for preparing high-whiteness composite calcium silicate using quartz sand, using quartz sand as a silicon source material, and proposing a process route to reduce the pH value of composite calcium silicate under existing conditions , to solve the problem of narrow application of existing composite calcium silicate

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0026] 2, preparation of water glass

[0027] The quartz sand and water and sodium hydroxide solution will be uniformly mixed, and the high pressure reactor is added, and the high-pressure reactor is added, and the high-pressure reactor is added to 150-200 ° C, pressurized. To 4-8 kg pressure, the reaction is 1.5-4 hours, sent to the water glass in the water glass, and the water glass solution is lowered to 60-75 ° C, and then transport it through the pump to the plate The frame is filtered, and the solution is separated from the unreacted quartz sand in the solution to prepare a water glass;

[0028] 3, prepare a low analog number of sodium silicate solution

[0029] The water glass mother is placed into the container, adding liquid base, sodium hydroxide, and reduces its modulus to 0.8-1.2, SiO 2 The concentration is reduced to 40-70 g / liter, which makes a low analog number of sodium silicate solution;

[0030] 4, calcium silicate synthesis reaction

[0031] Pumped the sodium ...

Embodiment 1

[0039] Water glass and rawl preparation with quartz sand, digestion, and prepare a low analog number of sodium silicate solution, synthesis, filtration, washing, releasing, reducing pH and drying, dispersion packaging, and preparing composite silicon The finished product, the specific production process includes the following steps:

[0040] 1, raw lime digestion

[0041] The standard raw gray is placed in a chamber, then 5-8 times the water, stirring, digested for 30 minutes, and the lime milk produced after digestion into lime breasted, and sampling detects effective CAO content;

[0042] 2, preparation of water glass

[0043]The standard quartz sand and water and sodium hydroxide solution are uniformly mixed by weight ratio of 1: 3: 1, and the high pressure reactor is added, and the high pressure reactor is added, under stirring conditions, heating to 180 ° C, pressurized to 6 kg stress. The reaction is 3 hours, sent to the water glass in the water glass, and the water glass so...

Embodiment 2

[0055] Water glass and rawl preparation with quartz sand, digestion, and prepare a low analog number of sodium silicate solution, synthesis, filtration, washing, releasing, reducing pH and drying, dispersion packaging, and preparing composite silicon The finished product, the specific production process includes the following steps:

[0056] 1, raw lime digestion

[0057] The standard raw stone is placed in a gray machine, then add 7 times water, stirring, digestion for 30 minutes, and lime milk produced after digestion into lime breast tanks, and sampling the effective CaO content;

[0058] 2, preparation of water glass

[0059] The standards of quartz sand and water and sodium hydroxide solution were uniformly mixed, and the high pressure reactor was added, and the high pressure reactor was added, and the temperature was heated to 150-200 ° C, pressurized to 4. -8 kg pressure, reaction for 3 hours, sent to water glass, cooling the coil in the water glass in the water glass, the ...

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Abstract

The invention discloses a process for preparing high-whiteness composite calcium silicate by using quartz sand. The process comprises the following steps: by taking water glass prepared from quartz sand and quick lime as raw materials, digesting the quick lime, preparing a low-modulus sodium silicate solution, synthesizing, filtering, washing, dealkalizing, reducing the pH value, drying, scattering and packaging to prepare a composite calcium silicate finished product. According to the process route and the used equipment conditions, the problem that the pH value of the originally produced composite calcium silicate is greater than 11 is solved by increasing the reaction temperature and pressure, the recovery rate of the NaOH solution is improved through the triple-effect evaporator, the cost of the production process is greatly reduced, and the aluminum sulfate additive is used, the process route for reducing the pH value of the composite calcium silicate is provided, and thus the composite calcium silicate product is wider in application range and better in performance, the production process is energy-saving and emission-reducing, waste liquid and hot water in each process step can be recycled or reused, and the whole process flow is lower in energy consumption.

Description

Technical field [0001] The present invention relates to a process of preparing high whiteness composite silicate using quartz sand; specifically, a silicon raw material is prepared by quartz sand, thereby achieving a process of producing calcium silicate. [0002] technical background [0003] Composite silicate is a material having good insulation refractory performance. Since the cost of producing calcium silicate is high, especially the high cost of silicon source materials, the composite silicate industry has developed slowly, composite silicate Blocking; currently using quartz sand and limestone as raw materials, limestone is calcined in the laboratory for 205 minutes under high temperature conditions of 900 ° C, grinding the calcined limestone, a fine powder having less than 200 microns, and puts the quartz sand at 800 ° C Calcined under high temperature conditions, then calcination after calcined rice husk and calcined limestone powder by flotation method, the method of cal...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B33/24
CPCC01B33/24
Inventor 宣全
Owner 宣全
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