The method of obtaining pativedha sodium metasilicate

 

(57) Abstract:

The invention relates to the production of alkali silicates and may find application in the chemical industry in the manufacture of detergents, cleaning, bleaching, disinfectants, textile, metallurgy, machine building, oil refining and other industries. The inventive pytevodniy metasilicate sodium is obtained by the allocation method of crystallization of sodium silica solution. A distinctive feature is that the crystallization process is carried out in polythermal mode when the cooling rate of the solution is 0.5 to 2oS/h is Obtained crystallized subjected to heat treatment at a temperature of 40-60oC. in Addition, it introduced amorphous silica in the range from 0.6 to 1.5% and again the mixture is subjected to heat treatment at a temperature of 40-60oC. In the crystallization process, the introduction of the seed when the temperature of the solution 50-55oC. the Invention can reduce the residual moisture pativedha sodium metasilicate, improve its quality and ensures high product yield by increasing the size of the crystal. 2 C.p. f-crystals.

The invention relates to proizvodsvennye in the chemical industry in the manufacture of detergents, scouring, bleaching, disinfectants, textile industry as a stabilizer for peroxide bleaching of fabrics and bleach raw materials, metallurgical and machine-building industry to remove hydrochloric acid from the surface of the metal in the oil refining industry as a coagulant.

A method of obtaining pativedha sodium metasilicate from sodium silicate mixtures, followed by centrifugation of the obtained slurry by separating the finished product of a mixture of caustic soda and deviations sodium metasilicate at W:T=2-3 and a temperature of 15-20oWith [1].

The disadvantage of this method is the length of the production process due to the presence of additional receive operation deviation sodium metasilicate, requiring additional cost that is economically feasible.

Also known is a method of obtaining pativedha sodium metasilicate by typing in silicate sodium-potassium silica solution of sodium hydroxide to the deposition module NaOH:KOH, equal to 0.96; 1,6; and 2 respectively with further crystallization and centrifugation pulp [2].

This method, however, does not provide dostatochnosti. The yield is about 40%.

The aim of the invention is the reduction of residual moisture pativedha sodium metasilicate, improving quality and ensuring high product yield by increasing the size of the crystal.

This goal is achieved by a method of obtaining pativedha sodium metasilicate by highlighting it by the method of crystallization of sodium silica solution. A distinctive feature is that the crystallization process is carried out in polythermal mode when the cooling rate of the solution of 0.5-2 deg/h

The resulting crystallized subjected to heat treatment at a temperature of 40-60oC. in Addition, it introduced amorphous silica in the range from 0.6 to 1.5% and again the mixture is subjected to heat treatment at a temperature of 40-60oC. In the crystallization process, the introduction of the seed when the temperature of the solution 50-55oC.

The conduction cooling speed of less than 0.5 deg/h is not economically feasible because of the increased time consuming process that leads to a large consumption of water. When cooled at a rate of over 2 deg/h the required crystal size is not reached.

The specified limit t is

The introduction of conditioning additives amorphous silica in an amount of 0.6-1.5% and further heat treatment of the mixture reduces the humidity of the product, to give it flowability and to improve the content of the basic substance.

Introduction to the solution of the seed (pativedha sodium metasilicate) when the temperature of the solution 50-55oWith speeds up the beginning of the crystallization process.

The invention provides for obtaining pativedha sodium metasilicate in the form of a crystalline non-dusting product with a basic substance content of at least 95% and a low content of water-insoluble impurities and oxide of iron.

The proposed method is as follows.

Example 1.

22 m3the original solution containing (g/DM3): SiO2- 160, Na2O - 380, at a temperature of 60-65oWith the pump in an industrial crystallizer solidarische type by volume of 24 m3supplied with frame stirrer with adjustable speed, and cooled to a temperature 54-51oC. Then, when the cooling stand solution for 2-4 h before the beginning of the crystallization process, accompanied by a rise in temperature of the reaction mass. Then cooling will gorhaut drying at a temperature of 40-60oC. the resulting product has a composition (wt.%): Na2O - 29,82, SiO2- 27,70, H2O - 41,8, Fe2ABOUT3- 0,012, water-insoluble residue is 0.05%. The weighted average size of the crystals is 800 μm, the output - 8 so

Example 2.

The process of obtaining pativedha sodium metasilicate carried out as in example 1. The original solution contains (g/DM3): SiO2- 150, Na2O - 380. After cooling to a temperature 51-54oWith when the cooling of the injected seed (pytevodniy metasilicate sodium) and maintain the solution for 2 h, then cooled lead at a rate of 0.5-2 deg/h until the temperature of the suspension 18-20oC. the resulting product has a composition (wt. %): Na2O - 29,91, SiO2- 27,65, H2O - 42,0, Fe2ABOUT3- 0,012, the insoluble residue is 0.05. The weighted average size of the crystals is 700 μm. Yield - 8 so

Example 3.

The process of obtaining pativedha sodium metasilicate carried out as in example 1, but use the original solution containing (g/DM3): SiO2- 160, Na2O - 400. The cooling is conducted at a rate of 0.5-2 deg/h In the received crystallized enter amorphous silica in a ratio of 100:1, after which the mixture is subjected to heat treatment at a temperature which the product (wt. %): Na2O - 29,45, SiO2- 27,72, N2On - 41,6, Fe2ABOUT3of 0.01, the insoluble residue is 0.04. The weighted average size of the crystals - 850 microns.

Unlike example 2 seed in the crystallization process was not introduced.

The proposed method allows to obtain crystals of large size, which contributes to the quality of the pressed product, reduction of residual moisture, reduce impurities in the form of iron oxide and water-insoluble residue. In addition, the presence of large crystals in the slurry reduces the losses by centrifugation and can improve the product yield with operation to 70%.

Currently, Berezniki LLC Soda-chlorate on the basis of the existing production deviations sodium metasilicate acquired experimental-industrial batch of pativedha sodium metasilicate, which meet high requirements of consumers on quality indicators, which allowed the company to profit from the sale of high-quality and cost-effective product.

SOURCES OF INFORMATION

1. Copyright certificate 676553, 01 33/32.

2. Copyright certificate 259068, 01 33/32.

1. The method of obtaining pativedha sodium metasilicate p the last use sodium silica solution, the crystallization process are in polythermal mode when the cooling rate of the solution is 0.5 to 2oC/h, and the resulting crystallized subjected to heat treatment at a temperature of 40-60oC.

2. The method according to p. 1, characterized in that the received crystallized injected from 0.6 to 1.5% of amorphous silica, after which the mixture is subjected to heat treatment at a temperature of 40-60oC.

3. The method according to p. 1, characterized in that the crystallization seed is injected at a temperature of 50-55oC.

 

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