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Preparation method of silicate aqueous solution

A water solution and silicate technology, applied in the direction of silicate, alkali metal silicate, chemical instruments and methods, etc., to achieve good economic and social benefits, flexible and controllable product modulus, and simplify the raw material refining process

Pending Publication Date: 2022-03-15
KUNMING DAOERSEN TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The reaction product is filtered to remove insoluble impurities, and the finished product is obtained after the solution is concentrated in a cooking kettle. The wet process can only produce low-modulus products with a modulus between 0.5 and 2.5, and the product application has relatively large limitations. , and the current wet preparation process needs to pressurize and heat up during the production process, and there is also a problem of energy consumption

Method used

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  • Preparation method of silicate aqueous solution
  • Preparation method of silicate aqueous solution
  • Preparation method of silicate aqueous solution

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preparation example Construction

[0030] The preparation method of described silicate aqueous solution, comprises the following steps:

[0031] (1) get fluosilicic acid and calcium carbonate normal temperature reaction, the clear filtrate obtained by solid-liquid separation after the reaction, use this clear filtrate as silicon source solution;

[0032] This step involves a chemical reaction:

[0033] h 2 SiF 6 +3CaCO 3 =3CaF 2 ↓+3CO 2 ↑+SiO2 2 (aq)

[0034] The obtained silicon dioxide is in a metastable solution state, has high activity, and is easy to polymerize with each other to form a colloid, or react with an alkali metal ion to form a salt.

[0035] (2) Mix alkali metal hydroxide AOH (AOH=NaOH or KOH or LiOH) with deionized water to prepare an alkali solution with a concentration of 10wt%-wt20%.

[0036] The solid particle raw material of alkali metal hydroxide can be directly used, but a white solid jelly will be generated in the initial stage of the reaction, and a colorless and transparent p...

Embodiment 1

[0053] A preparation method of aqueous sodium silicate solution, comprising the following steps:

[0054] (1) Weigh 12033g of fluosilicic acid solution with a concentration of 14.37wt% and react with 8340g of calcium carbonate suspension with a concentration of 43.21wt% for 20 minutes, then separate the solid from the liquid through a plate and frame filter, clean the filter cake with 2100g of clear water, and combine the washings into the filtrate to obtain clear filtrate 15636g, SiO in the filtrate 2 wt% = 4.12%.

[0055] (2) Weigh 418g of the prepared 20wt% NaOH solution.

[0056](3) Start the reactor to stir, then get 7000g of the filtrate of step (1) and the NaOH solution of step (2) into the reactor continuously within 5 minutes simultaneously, then continue to react for 30 minutes to obtain a clear and transparent solution. In this step, lye can be added to the filtrate, or the filtrate can be added to the lye to react, but it takes a long reaction time to eliminate t...

Embodiment 2

[0071] A kind of preparation method of sodium silicate aqueous solution

[0072] In this embodiment, the amount of NaOH solution is changed to 874g, and the rest are the same as in Example 1.

[0073] The membrane is concentrated until the specific gravity of the remaining solution in the raw material tank increases to 1.478g / cm 3 When, stop concentrating, obtain clear liquid 6739g simultaneously. According to the analysis of GB / T4209-2008 "Industrial Sodium Silicate", the indicators of the obtained sodium silicate product and clear liquid are as follows.

[0074] Table 2 embodiment 2 gained product analysis index

[0075] SiO 2 %

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Abstract

The invention relates to a preparation method of a silicate aqueous solution, and belongs to the technical field of silicate preparation. An active silicic acid-containing solution obtained by reaction of fluosilicic acid and calcium carbonate is used as a silicon source, and an aqueous solution of sodium hydroxide, potassium hydroxide or lithium hydroxide is used as an alkali source; and reacting the two solutions at room temperature and normal pressure to obtain a corresponding silicate dilute solution product, and concentrating the dilute solution in a membrane filtration manner to obtain a product meeting market requirements. The production process is simple, the energy consumption is low, and the obtained product is clear and transparent; according to the silicate preparation method provided by the invention, the product is low in energy consumption and does not need to be heated and pressurized, and the prepared water glass product is high in modulus which can be controlled between 1 and 12 as required.

Description

technical field [0001] The invention belongs to the technical field of silicate preparation, and in particular relates to a method for preparing an aqueous silicate solution. Background technique [0002] Water glass can be divided into sodium water glass, potassium water glass and lithium water glass according to the type of alkali metal, and its chemical name and molecular formula are sodium silicate (Na2O nSiO2), potassium silicate (K2O nSiO2), lithium silicate (Li2O nSiO2), the coefficient n in the formula is called the water glass modulus, which is the molar ratio of silicon dioxide and alkali metal oxides in the water glass. The higher the modulus of water glass, the higher the silica content, the higher the viscosity of the solution, the easier to decompose and harden, the higher the cohesive force, and the better the application performance. [0003] At present, the preparation methods of water glass are mainly dry method and wet method. The dry method preparation p...

Claims

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Application Information

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IPC IPC(8): C01B33/32
CPCC01B33/32C01B33/325
Inventor 裴文俊王华蔡秉洋
Owner KUNMING DAOERSEN TECH
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