CN101837985B - Preparation method of sodium metasilicate nonahydrate - Google Patents

Abstract

A preparation method of sodium metasilicate nonahydrate, the waste glass is cleaned, dried, and ground into glass powder of more than 200 meshes, and then the NaOH solution with a concentration of 15% to 30% and the waste glass powder are mixed in a mass ratio of 4 - Mix 7:1, heat to 90°C~100°C, and react under continuous stirring for 50min~150min; when the reaction product is cooled to 50°C~60°C, add 0.5%~1% of the total mass of the reaction product nonahydrate while stirring Sodium metasilicate, and at the same time add 0.1% to 0.5% sodium dodecyl sulfate of the total mass of the reaction product, naturally cool down to room temperature, and crystallize for 18 hours to 68 hours; at 25°C to 30°C, bake for 200min to 300min . The invention can make full use of silicon dioxide and sodium oxide, the main components in waste glass, reduce the amount of caustic soda used in production, reduce reaction time, and reduce production energy consumption and production cost.

Description

A kind of preparation method of sodium metasilicate nonahydrate

technical field

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

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

The purpose of the present invention is to use waste glass to produce sodium metasilicate nonahydrate, so as to reduce the production energy consumption of sodium metasilicate nonahydrate, save resources and reduce costs.

The present invention is achieved through the following technical solutions.

Clean the waste glass, dry it, and grind it into glass powder of more than 200 mesh, and then follow the steps below:

(1) Mix NaOH solution with a concentration of 15% to 30% and waste glass powder at a mass ratio of 4 to 7, heat to 90°C to 100°C, and react for 50min to 150min under continuous stirring;

(2) When the reaction product is cooled to 50°C to 60°C, add sodium metasilicate nonahydrate with a total mass of 0.5% to 1% of the total mass of the reaction product as a seed crystal while stirring, and simultaneously add 0.1% to 0.5% of the total mass of the reaction product % sodium lauryl sulfate as a dispersant, then naturally lowered to room temperature, and crystallized for 18 hours to 68 hours;

(3) Dry at 25°C-30°C for 200min-300min to obtain sodium metasilicate nonahydrate.

The present invention uses waste glass as the main raw material to prepare sodium metasilicate nonahydrate, which can make full use of silicon dioxide and sodium oxide, the main components in waste glass, make full use of waste resources, and reduce the amount of caustic soda used in production; the reactivity of waste glass powder and NaOH High, can reduce reaction time and reduce production energy consumption. It has the advantages of energy saving, consumption reduction and production cost reduction.

Detailed ways

The invention will be further illustrated by the following examples.

Example 1:

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 the drying time is about 220 minutes, and the product of sodium metasilicate nonahydrate is obtained.

Example 2:

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 about 260 minutes, and the product of sodium metasilicate nonahydrate is obtained.

Example 3:

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.

Claims (1)

1. a preparation method of sodium metasilicate nonahydrate, waste glass is cleaned, dried, ground into glass powder more than 200 orders, it is characterized in that also comprising the following steps: (1) Mix NaOH solution with a concentration of 15% to 30% and waste glass powder at a mass ratio of 4 to 7:1, heat to 90°C to 100°C, and react for 50min to 150min under continuous stirring; (2) When the reaction product is cooled to 50°C to 60°C, add sodium metasilicate nonahydrate with 0.5% to 1% of the total mass of the reaction product while stirring, and simultaneously add 0.1% to 0.5% of the total mass of the reaction product to Dialkyl sodium sulfate, then naturally lowered to room temperature, crystallized for 18 hours to 68 hours; (3) Bake for 200min to 300min at a temperature of 25°C to 30°C.