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Green method for preparing sodium silicate by recycling three wastes of organic silicon

A technology of organosilicon and sodium silicate, applied in the direction of silicate, alkali metal silicate, etc., can solve the problems of odor of sodium silicate solution, decolorization under pressure operation, no clear description, etc., to achieve high application value, eliminate The liquidity becomes poor and the effect of full recycling is realized

Active Publication Date: 2022-01-04
SHANDONG DONGYUE ORGANIC SILICON MATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

There are two problems in this process: the quartz sand contains a large amount of impurity elements such as heavy metals and the problem of coloration, how to achieve the elimination of heavy metal ions and decolorization The patent does not clearly state that no decolorization and impurity removal will limit the application of sodium silicate to other fields; Ammonia water reaction, ammonia water is easily soluble in water, which will inevitably lead to peculiar smell of sodium silicate solution, so how to solve the problem of excessive ammonia water, the patent does not clearly explain
Therefore, although the recovery of silicon dioxide from rice husk ash is a method for recovering silicon elements, it cannot be used for large-scale industrial recovery of the three wastes of organic silicon monomer enterprises due to problems such as pressure operation and the need for decolorization, and its application prospects are limited.

Method used

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  • Green method for preparing sodium silicate by recycling three wastes of organic silicon

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Experimental program
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Effect test

Embodiment 1

[0029] After the silicon-containing waste is incinerated at 950±30°C for 1 second, a solid-phase silicon-containing ash slag is obtained. Mix the slag containing silicon ash with 5% waste lye, stir at 80°C for 8 hours, and then pass it into a centrifuge for the first centrifugation to separate the solid and liquid phases; the liquid phase enters the stirring tank, and adds 20% waste acid into the stirring tank The solution was stirred for 3 hours to convert sodium silicate into solid-phase silicic acid, let go of the liquid phase, and the solid-phase silicic acid remained in the stirred tank; add 5% waste lye to the stirred tank filled with solid-phase silicic acid again, Dissolve silicic acid again, then add toluene and heat to reflux at 110°C with water for 0.5h, the sodium silicate solution and toluene are layered, the lower layer is a slightly yellow sodium silicate solution with good fluidity (modulus 3.2-3.9), and the upper layer Recycle.

Embodiment 2

[0031] After the silicon-containing waste is incinerated at 1000±50°C for 3 seconds, a solid-phase silicon-containing ash slag is obtained. Mix the slag containing silicon ash and 5% waste caustic soda and heat it at 90°C, pass it into a centrifuge after stirring, and perform the first centrifugation to separate the solid and liquid phases; the liquid phase enters the stirring tank, and adds 24% waste Stir the acid solution for 2 hours to convert sodium silicate into solid-phase silicic acid, let go of the liquid phase, and leave the solid-phase silicic acid in the stirred tank; add 5% waste lye to the stirred tank filled with solid-phase silicic acid , dissolve silicic acid; then repeat 1 time with 24% waste acid and 5% waste lye to convert sodium silicate to silicic acid and then to sodium silicate; then add toluene to the sodium silicate solution and heat it under reflux at 110°C Water for 5 hours, sodium silicate solution and toluene layered, the lower layer is a colorless...

Embodiment 3

[0033]After the silicon-containing waste is incinerated at 1100±20°C for 4s, a solid-phase silicon-containing ash slag is obtained. Mix the silicon ash-containing slag with 6% waste caustic soda and heat it at 100°C. After stirring, pass it into the centrifuge for the first centrifugation to separate the solid-liquid phase; the liquid phase enters the stirring tank, and adds 27% waste Stir the acid solution for 1 hour to convert sodium silicate into solid-phase silicic acid, let go of the liquid phase, and leave the solid-phase silicic acid in the stirred tank; add 6% waste lye to the stirred tank filled with solid-phase silicic acid , dissolve silicic acid, and then repeat twice with 27% spent acid and 6% spent lye to convert sodium silicate to silicic acid and then to sodium silicate; then add toluene to the sodium silicate solution and heat it under reflux at 130°C Water for 3 hours, sodium silicate solution and toluene layered, the lower layer is a colorless and transparen...

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Abstract

The invention relates to a green method for preparing sodium silicate by recycling three wastes of organic silicon, and belongs to the technical field of organic silicon. The method comprises the following steps: (1) burning silicon-containing three wastes to obtain solid-phase silicon-containing ash; (2) mixing, heating and stirring the silicon-containing ash and waste alkali liquor, and then centrifugally separating a solid phase and a liquid phase; (3) enabling the liquid phase to enter a stirring kettle, adding waste acid liquid into the stirring kettle, discharging the liquid phase, and leaving solid silicic acid in the stirring kettle; and (4) adding the waste alkali liquor into the stirring kettle containing solid-phase silicic acid, then adding methylbenzene, heating and carrying out water reflux, finely adjusting the modulus of the sodium silicate solution, and carrying out liquid separation and recovery. The method is scientific and reasonable in design, fully utilizes the silicon-containing three wastes, the waste alkali liquid and the waste acid liquid, is green and environment-friendly, achieves the purpose of generating high-value products by mutual waste gram, and is high in industrial application value.

Description

technical field [0001] The invention relates to a method for preparing sodium silicate by green recycling organic silicon waste, and belongs to the technical field of organic silicon. Background technique [0002] The production chain of organosilicon monomer enterprises will produce a large amount of three wastes, namely waste liquid, waste solid and waste gas, from the synthesis of methyl chloride to the production of mid- and downstream products. The main components of these three wastes contain silicon element, or exist in the form of silicon methyl bond, silicon chlorine bond, silicon oxygen silicon bond and so on. Most of the three wastes of organic silicon are classified as hazardous waste, and the treatment cost of hazardous waste is very high. Therefore, not only does hazardous waste not produce benefits, but it will cause waste of raw materials and occupy production costs. The cost of hazardous waste treatment is an important component of the production cost of a s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B33/32
CPCC01B33/32Y02P40/10
Inventor 伊港周志永胡庆超周玲郑建青石科飞周磊张帅刘虎张江张海雷张广亮
Owner SHANDONG DONGYUE ORGANIC SILICON MATERIAL
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