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Preparation method of sodium metasilicate nonahydrate

A technology of sodium metasilicate nonahydrate and reaction products, applied in the direction of silicate, alkali metal silicate, etc., can solve the problems of high production cost, large resource consumption, large energy consumption, etc., and achieve reduction of reaction time, High reactivity and reduced production energy consumption

Inactive Publication Date: 2010-09-22
NANCHANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the production of sodium metasilicate nonahydrate usually uses water glass and sodium hydroxide as the main raw materials, and is obtained through processes such as evaporation and concentration, cooling and crystallization, centrifugal separation, and drying. larger

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0012] The main raw materials are waste flat glass and industrial caustic soda. Clean the waste glass, dry it, and grind it into 200-mesh glass powder; make industrial caustic soda into NaOH solution with a concentration of 25%, mix it with waste glass powder at a mass ratio of 4.8:1, and heat them to 95°C to make them Reaction, heating and stirring continuously during the reaction process, the reaction time is 70min; after the reaction is completed, the viscous reaction product is cooled to 50°C, and sodium metasilicate nonahydrate with 0.5% of the total mass of the reaction product is added as a seed crystal while stirring, and At the same time, 0.1% sodium lauryl sulfate of the total mass of the reaction product was added as a dispersant, and then naturally cooled to room temperature, sodium metasilicate nonahydrate slowly crystallized. It takes 38 hours for the crystallization of sodium metasilicate nonahydrate. Dry the excess water, the drying temperature is 30°C, and th...

Embodiment 2

[0014] The main raw materials are waste glass wine bottles and ionic membrane alkali with a concentration of 25%. Clean the waste glass, dry it, and grind it into powder (above 200 mesh); mix the ion-exchange membrane alkali and waste glass powder at a mass ratio of 5.2:1, and heat them to 100°C to make them react, and heat the reaction process Continue to stir, and the reaction time is 85min; after the reaction is completed, the viscous reaction product is cooled to 60°C, and sodium metasilicate nonahydrate with 0.6% of the total mass of the reaction product is added as a seed crystal while stirring, and the total mass of the reaction product is added at the same time. 0.1% sodium lauryl sulfate was used as a dispersant, and then naturally cooled to room temperature, sodium metasilicate nonahydrate slowly crystallized. It takes 42 hours for the crystallization of sodium metasilicate nonahydrate. Dry the excess water, the drying temperature is 30°C, and the drying time is abo...

Embodiment 3

[0016] The main raw materials are waste flat glass and diaphragm alkali with a concentration of 25%. Clean the waste glass, dry it, and grind it into powder (more than 200 mesh); mix the diaphragm alkali and waste glass powder at a mass ratio of 5.8:1, and heat them to 95°C to make them react. Stirring should be continued, and the reaction time is 75 minutes; after the reaction is completed, cool the viscous reaction product to 55°C, and add sodium metasilicate nonahydrate with 0.6% of the total mass of the reaction product as a seed crystal while stirring, and add the reaction product at the same time 0.2% sodium lauryl sulfate in the total mass of the product was used as a dispersant, and then naturally cooled to room temperature, and sodium metasilicate nonahydrate slowly crystallized. It takes 40 hours for the crystallization of sodium metasilicate nonahydrate. Dry the excess water at 30°C for 230 minutes to obtain the sodium metasilicate nonahydrate product.

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Abstract

The invention discloses a preparation method of sodium metasilicate nonahydrate, which comprises the following steps of: cleaning an drying waste glass; grinding the waste glass into glass powder of over 200 meshes; mixing 15-30 percent NaOH solution with the waste glass powder in a mass ratio of 4-7:1; heating the mixture to the temperature of between 90 and 100 DEG C; performing a reaction for 50 to 150 minutes with continuous stirring; when a reaction product is cooled to the temperature of between 50 and 60 DEG C, adding sodium metasilicate nonahydrate which is 0.5 to 1 percent of the total mass of the reaction product into the reaction product while stirring, and simultaneously adding lauryl sodium sulfate which is 0.1 to 0.5 percent of the total mass of the reaction product into the reaction product; naturally cooling the mixture to the room temperature; performing crystallization on the mixture for 18 to 68 hours; and baking the mixture after crystallization for 200 to 300 minutes at the temperature of between 25 and 30 DEG C. The preparation method can fully use silicon dioxide and sodium oxide namely the main components in the waste glass, reduce the used amount of sodium hydroxide in production, and reduce the reaction time, the production energy consumption and the production cost.

Description

technical field [0001] The invention belongs to the field of preparation of inorganic non-metallic materials. It relates to a method for producing sodium metasilicate nonahydrate, in particular to a method for producing sodium metasilicate nonahydrate by using waste glass. Background technique [0002] Sodium metasilicate nonahydrate is widely used in papermaking, machinery, electronics, chemical industry, building materials, food, oil field, mining, ceramics and other fields, especially in the detergent industry, which has become the best choice for phosphorus-containing additives that seriously pollute the environment Good alternative product. At present, the production of sodium metasilicate nonahydrate usually uses water glass and sodium hydroxide as the main raw materials, and is obtained through processes such as evaporation and concentration, cooling and crystallization, centrifugal separation, and drying. larger. Contents of the invention [0003] The purpose of...

Claims

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Application Information

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IPC IPC(8): C01B33/32
Inventor 胡明玉彭金生丁成平
Owner NANCHANG UNIV
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