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Process for preparation of delta-layed crystalline sodium disilicate using attapulgite

A technology of attapulgite clay and sodium disilicate, which is applied in the direction of silicate, alkali metal silicate, chemical instruments and methods, etc., and can solve the problem of low purity, unstable performance and water quality of layered crystalline sodium disilicate. Eutrophication pollution and other problems can overcome the instability of product performance, shorten the time of crystal transformation, and improve the utilization rate

Inactive Publication Date: 2009-02-04
HUAIYIN INSTITUTE OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Sodium tripolyphosphate (STPP) is the detergent builder with the largest dosage and superior washing performance so far, but the long-term and large-scale use of sodium tripolyphosphate has caused great pollution to the environment and has become the main pollution source of water eutrophication
Comprehensive analysis of the existing preparation methods of layered crystalline sodium disilicate, its production raw materials are mainly chemical and chemical raw materials, the production cost is higher, and the crystallization process from amorphous sodium disilicate to layered sodium disilicate is in a single Carried out at high temperature, the purity of the prepared layered crystalline sodium disilicate is not high, and the performance is unstable, thus restricting the promotion and application of layered crystalline sodium disilicate in the washing and chemical industry

Method used

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Examples

Experimental program
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Effect test

example 1

[0013] Attapulgite powder 200g, containing SiO 2 、Al 2 o 3 , Fe 2 o 3 56.8%, 9.2% and 4.6% respectively, roasted at 620°C for 20min, cooled to 110°C and added water to prepare a slurry with a solid content of 20%, and in the slurry was added dropwise industrial sulfuric acid with a concentration of 92.5%. The value is maintained at 1.5, the temperature of the control system is 95°C, leached for 60 minutes under stirring and shaken, and then centrifuged, the solid phase part is washed with water until the pH is 5.0 and then centrifuged, and the activated attapulgite is obtained after removing a small amount of impurities that sink to the bottom ;

[0014] Put the above-prepared activated attapulgite in a flask, add 360ml of aqueous solution containing 34.6g of sodium hydroxide, add heat to a slight boil, and react for 2h in a stirring state. After concentration, the reactant is placed in an oven and dried at 140°C Amorphous sodium disilicate was obtained in 55 minutes.

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example 2

[0019] Attapulgite powder 100g, SiO 2 Content 52.1%, Al 2 o 3 Content 8.4%, Fe 2 o 3 content of 4.9%, after roasting at 650°C for 20 minutes, cool to 110°C and prepare a slurry with a solid content of 20% with water, drop industrial sulfuric acid with a concentration of 92.5% into the slurry to maintain the pH value of the slurry at 2.0, The slurry is leached for 80 minutes at a temperature of 95°C and shaken, and then centrifuged at a variable speed. The solid phase material is washed with water until the pH is 5.5, and a small amount of impurities at the bottom are removed to obtain activated attapulgite.

[0020] Put the activated attapulgite prepared above in a flask, weigh 16.8g of sodium hydroxide and add 150ml of water, mix with the activated attapulgite after the sodium hydroxide is dissolved, heat to a slight boil, react for 110min in a stirring state, and place the reactant in a blast In a drying oven, dry at 150°C for 45 minutes to obtain amorphous sodium disili...

example 3

[0024] Attapulgite powder 400g, SiO 2 Content 54.6%, Al 2 o 3 Content 8.0%, Fe 2 o 3 content of 3.5%, after roasting at 700°C for 30 minutes, cool to 110°C and prepare a slurry with a solid content of 25% with water, adjust the pH of the slurry to 2.5 with industrial sulfuric acid with a concentration of 92.5%, drop as needed during the reaction Add sulfuric acid to keep the pH value of the slurry at 2.5, leaching the slurry for 1.5 hours at a temperature of 95°C and shaking, then perform variable speed centrifugation, wash with water until the pH is 6.0, and remove a small amount of impurities at the bottom to obtain an active pit earth.

[0025] Put the activated attapulgite prepared above in a flask, prepare an aqueous sodium hydroxide solution with 80g of sodium hydroxide and 750ml of water, pour it into a reaction bottle filled with activated attapulgite, disperse evenly, heat to a slight boil, and stir After reacting for 120 minutes, the reactant was placed in a for...

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Abstract

The invention discloses a making method of delta-layered crystallized sodium bisilicate through concavo-convex bar clay, which comprises the following steps: sintering concavo-convex bar clay under 500-700 deg.c for 20-30 min; cooling to 110 deg.c to allocate 15-25% slurry; dripping sulfuric acid with pH value to 1.0-2.5; controlling temperature to 95 deg.c; leaching for 50-90min; separating liquid from solid; washing to pH value at 4.5-6.0; centrifuging; separating to obtain active concave clay; weighing solid NaOH with the rate of SiO2 and Na2O at 1.9-2.1; allocating NaOH solution with cleaned concave clay and water at 1:2.5-3.5; adding NaOH solution into active concave clay to react 1.5-2.0 h under 90-microboiling condition; condensing liquid; placing condensate into baker; drying under 120-180 deg.c for 40-60 min; obtaining amorphous sodium bisilicate; transmitting amorphous sodium bisilicate into microwave oven; proceeding heat disposal under 400-600 deg.c for 30-80 min; disposing under 720-780 deg.c for 30-60 min; cooling to obtain the product.

Description

technical field [0001] The invention relates to a method for preparing δ-layer crystalline sodium disilicate from attapulgite clay, and belongs to the technical field of preparation of washing aids in the field of inorganic chemical industry. Background technique [0002] Sodium tripolyphosphate (STPP) is the detergent builder with the largest amount and excellent builder performance so far. However, the long-term and large-scale use of sodium tripolyphosphate has caused great pollution to the environment and has become the main pollution source of water eutrophication. Over the years, countries around the world have been committed to the research of various alternatives to STPP, such as reported composite carbonates, various zeolites, sodium metasilicate, sodium citrate, sodium nitrilotriacetate (NTA), carboxymethoxysuccinate Sodium trisodium (CMOS), polyacrylate, crystalline layered sodium silicate, etc. δ-Layered crystalline sodium disilicate is an environmentally friend...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B33/32C01B33/38C11D3/08
Inventor 李登好冯良东
Owner HUAIYIN INSTITUTE OF TECHNOLOGY
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