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Method for preparing sodium methasilicate pentahydrate

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

Inactive Publication Date: 2012-01-11
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 pentahydrate usually uses water glass and sodium hydroxide as the main raw materials, and is obtained through evaporation and concentration, cooling and crystallization, centrifugal separation, drying and other processes. bigger

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 4.0:1, and heat them to 95°C to make them Reaction, heating and continuous stirring 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 pentahydrate 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, and sodium metasilicate pentahydrate slowly crystallized. It takes 35 hours for the crystallization of sodium metasilicate pentahydrate. Dry the excess water, the drying temperature is 35°C, a...

Embodiment 2

[0014] The main raw materials are waste glass wine bottles and ionic membrane alkali with a concentration of 32%. 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 3.6:1, and heat them to 100°C to make them react, heating the reaction process Stir continuously, and the reaction time is 80 minutes; after the reaction is completed, the viscous reaction product is cooled to 60°C, and sodium metasilicate pentahydrate 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 pentahydrate crystallized slowly. It takes 40 hours for the crystallization of sodium metasilicate pentahydrate. Dry the excess water, the drying temperature is 35°C, and the drying tim...

Embodiment 3

[0016] Waste flat glass and diaphragm alkali with a concentration of 30% are used as main raw materials. Clean the waste glass, dry it, and grind it into powder (above 200 mesh); mix the diaphragm alkali and waste glass powder at a mass ratio of 5.1:1, and heat them to 95°C to make them react. Stirring should be continued, and the reaction time is 80 minutes; after the reaction is completed, cool the viscous reaction product to 55°C, and add sodium metasilicate pentahydrate 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 pentahydrate slowly crystallized. It takes 40 hours for the crystallization of sodium metasilicate pentahydrate. Dry the excess water at 30°C for 160 minutes to obtain the sodium metasilicate pentahydrate product.

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PUM

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Abstract

The invention discloses a method for preparing sodium methasilicate pentahydrate. The method comprises the following steps of: washing waste glass, drying the washed waste glass and grinding the dried waste glass into glass powder of over 200 meshes; mixing 20 to 36 percent NaOH solution and the waste glass powder in a mass ratio of 3.5-6:1; heating the mixture to the temperature of between 90 and 100 DEG C; reacting the mixture for 50 to 150min with continuous stirring; cooling the reaction product to the temperature of between 50 and 60 DEG C; adding the sodium methasilicate pentahydrate and sodium lauryl sulfate which respectively account for 0.5 to 1 percent and 0.1 to 0.5 percent of the total mass of the reaction product with stirring; naturally cooling the mixture to room temperature; devitrifying the mixture for 12 to 58h; and baking the obtained product at the temperature of between 30 and 35 DEG C for 120 to 260min. The method has the advantages of reducing the using amount of the sodium hydroxide, reaction time, production power consumption and cost by fully using the main components, namely silicon dioxide and sodium oxide, in the waste glass.

Description

technical field [0001] The invention belongs to the field of preparation of inorganic non-metallic materials. The invention relates to a method for producing sodium metasilicate pentahydrate, in particular to a method for producing sodium metasilicate pentahydrate by using waste glass. Background technique [0002] Sodium metasilicate pentahydrate 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 pollute the environment Good alternative product. At present, the production of sodium metasilicate pentahydrate usually uses water glass and sodium hydroxide as the main raw materials, and is obtained through evaporation and concentration, cooling and crystallization, centrifugal separation, drying and other processes. larger. Contents of the invention [0003] The purpose...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B33/32
Inventor 胡明玉彭金生丁成平
Owner NANCHANG UNIV