Method for preparing high-modulus sodium silicate

A technology of sodium silicate and high modulus, applied in the direction of silicate, alkali metal silicate, etc., can solve the problems of high modulus sodium silicate preparation, insufficient utilization, high raw material consumption, etc., and achieve great economic benefits and Social benefits, low product cost, and low price effects

Inactive Publication Date: 2008-12-10
PINGSHUO INDAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Among them, the dry method is to mix quartz sand with soda ash or sodium sulfate, and carry out a melting reaction in a high-temperature furnace at 1400-1500 ° C for 6-7 hours. The material is moved to the dissolving tank and dissolved with hot steam. The steam pressure is about 0.4MPa. The dissolved material is discharged into the clarification tank for a long time to settle naturally or filter to remove the residue. The clarified supernatant is then pumped to the evaporation tank. The sodium silicate product is concentrated in the concentrator to the required concentration. Its advantage is that sodium silicate with various moduli can be produced, such as M being 0.5-4.0, especially high modulus sodium silicate with M>2.5. The disadvantages are high energy consumption and heavy pollution
Like the dry method, the wet method also needs to remove the residue and then evaporate and concentrate to obtain the product. Its advantage is that it avoids high temperature reaction, but it has the disadvantage of high raw material consumption and only low modulus sodium silicate can be prepared.
[0004] In addition, industrial waste such as fly ash has not been fully utilized in the prior art to prepare high modulus sodium silicate regardless of wet or dry methods

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Using 36% caustic lye, according to the liquid-solid ratio (weight ratio) of 4:3, at 120 ° C under normal pressure hot dip containing SiO 2 For 47% fly ash for 45 minutes, prepare a low modulus sodium silicate solution with M of 0.57, in which SiO 2 The content is 60g / L. At a temperature of 80°C, with desulfurized CO 2 Content is 38% flue gas carbonation decomposes this solution, prepares silicic acid (SiO 2 ·nH 2 O). Separation by filtration, wash the silicic acid filter cake with hot water at about 70°C for three times, then measure its moisture content, and mix low modulus sodium silicate, caustic alkali and silicic acid according to the index of M being 3.5-3.7, Put the blended materials in a pot at 95-110°C for 20 minutes with stirring and boiling to prepare a sodium silicate product with an M of 3.5-3.7.

[0028] The sodium carbonate liquid filtered out after the carbon separation is causticized with milk of lime at 95-100°C, evaporated to the original causti...

Embodiment 2

[0030] Grind kaolin to 200 mesh, roast at 1050°C for 1 hour, use 18% caustic lye, according to the liquid-solid ratio (weight ratio) of 5:1, soak at 100°C for 2 hours, and then separate the solid and liquid to prepare the low mold. Number of sodium silicate solutions, SiO in the solution 2 The content is 41g / L. Then utilize the technology described in the patent application 200716062197.1 to carry out carbonization on this solution twice. The primary carbon is used to remove impurities such as iron, titanium and aluminum in the solution, and the secondary carbon is used to prepare relatively pure silicic acid (SiO 2 ·nH 2 O). After filtration and separation, wash the silicic acid several times with hot water at 65°C, remove the sodium carbonate adsorbed by the silicic acid, and measure the moisture content of the silicic acid. Blend with silicic acid, stir and heat the blended material at 95-100°C for 20 minutes to prepare a sodium silicate product with an M of 3.1-3.5.

...

Embodiment 3

[0033] SiO2 The coal gangue with a content greater than 45% is crushed, calcined at 1150°C for 2 hours, then ground to 200 mesh, and hot soaked at 105°C for 2 hours with 15% caustic lye at a liquid-solid ratio (weight ratio) of 8:1. A low modulus (M2 ·nH 2 O). After filtration and separation, the sodium carbonate adsorbed by silicic acid was washed away with hot water at 70°C. According to the index of M being 2.5-3.0, mix low modulus sodium silicate, caustic alkali and silicic acid, stir at 110°C until the silicic acid is completely dissolved, the reaction time is about 20 minutes, and the M is 2.5-3.1 of sodium silicate.

[0034] The secondary carbon separation mother liquor obtained by filtration and separation is causticized with lime, and a small amount of caustic soda is added to the original concentration, and then directly returned to the alkali leaching process for recycling.

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PUM

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Abstract

The invention discloses a method for producing high-modulus sodium silicate at low temperature and normal pressure. The method comprises the following steps: the activated silicon dioxide from fly ash-typed industrial waste is leached by caustic lye of soda to produce low-modulus sodium silicate solution, the solution is decomposed by carbonation to prepare silicic acid (SiO2nH2O), then the silicic acid, the low-modulus sodium silicate and / or sodium hydroxide solution are mixed at the modulus index required by the final sodium silicate products and stirred to dissolve at temperature lower than liquid boiling point, therefore, the high-modulus sodium silicate is produced. Compared with the existing drying and wet methods for producing sodium silicate, the method of the invention has the advantages of wide raw material resources, low cost and energy consumption, no pollution; the method can be used for producing the sodium silicate with any modulus (M) from 1 to 4, in particular to the high-modulus sodium silicate, and has great industrialized generalization and application value.

Description

technical field [0001] The invention relates to the comprehensive utilization of fly ash industrial waste and the preparation of inorganic salt---sodium silicate, which belongs to a technology for preparing high modulus sodium silicate from fly ash industrial waste. Background technique [0002] Sodium silicate is often called sodium silicate or sodium silicate. It is an inorganic salt product with a wide range of applications. It is mainly used in detergents, soap making, packaging, precision casting, welding electrode production, coatings, building materials and Metallurgy and other industries are also the basic raw materials for the production of silica gel, molecular sieve and white carbon black. One of the characterization indicators of sodium silicate solution is the modulus, that is, SiO in sodium silicate solution 2 and Na 2 The mass ratio of O, currently the use of high modulus sodium silicate solution occupies a dominant position. [0003] The manufacturing meth...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B33/32
Inventor 秦晋国郭继萍宋頔左春霞李桂艳
Owner PINGSHUO INDAL
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