Process for continuously producing sodium fluosilicate

A continuous technology of sodium fluorosilicate, applied in the field of continuous production of sodium fluorosilicate, can solve the problems of decreased production capacity of the device, the particle size cannot be too fine, and the consumption is increased, so as to improve the yield, coarse crystals, and eliminate supersaturation. Effect

Inactive Publication Date: 2008-11-19
YUNNAN THREE CIRCLES SINOCHEM FERTILIZERS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

But its shortcomings are: backward technology, low production efficiency, high labor intensity, only suitable for small-scale, workshop-style production, not suitable for modern large-scale production
However, since the single-cell synthesis tank is still used for continuous production, in the same space of the single-cell synthesis tank, it is necessary to realize the raw material H 2 SiF 6 , NaCl solution (or Na 2 SO 4 solution), but also to achieve Na 2 SiF 6 The formation and growth of precipitated crystals must also realize the removal of reaction products. This method cannot avoid the short circuit of a large number of newly formed fine crystals and mix them into the reaction products removed from the synthesis tank.
Removed from the synthesis tank, finely divided Na 2 SiF 6 When the crystallization enters the follow-up process, it is difficult to settle in the thickener and dry in the centrifuge, which reduces the production capacity of the device and affects the liquid-solid separation and washing process. Na 2 SiF 6 More products, lower yield, higher consumption, easy to pollute the environment
Too finely divided Na 2 SiF 6 When the crystallization is dried with an airflow dryer, it is easy to cause a high content of fine dust in the drying tail gas, which makes it difficult to collect and remove dust, and the efficiency decreases, resulting in product loss and polluting the environment.
Moreover, finely divided crystals are difficult to satisfy users' (especially European market users) requirements for Na 2 SiF 6 The product has the requirement of "the particle size should not be too fine, and there is a lower limit limit". The product that is too fine has a large specific surface area, and after packaging, it is easy to agglomerate during storage and transportation.

Method used

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  • Process for continuously producing sodium fluosilicate
  • Process for continuously producing sodium fluosilicate
  • Process for continuously producing sodium fluosilicate

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Embodiment 1

[0038] Adopting the "continuous production of sodium fluorosilicate-crystal growth tank process" of the present invention, the process is provided with one single cell synthesis tank and two crystal growth tanks. The single-cell synthetic tank is a steel tank with a cylindrical shape (φ2.6×2.3m) and a conical bottom (cone height 1.4m) with anti-corrosion treatment, and its volume is 16.3M 3 , its effective volume is 13.0M 3 . The two crystal growth tanks are of the same size, both are cylindrical (φ2.1×1.8m) steel tanks with conical bottom (cone height 1.1m) with anti-corrosion treatment, and their volumes are both 8.15M 3 , its effective volume is 6.5M 3 . The total volume of single synthesis tank and 2 crystal growth tanks is 32.6M 3 , the total effective volume is 26.0M 3 .

[0039] The sodium fluorosilicate production capacity of the device is 5.190t / h, the fluorine yield is 90%, and the addition amount of 100% fluorosilicate is 4.417t / h, and all fluorosilicates are ...

Embodiment 2

[0045] Adopt the "continuous production of sodium fluorosilicate - multi-cell synthesis tank process" of the present invention. The multi-grid synthetic tank for anti-corrosion treatment is a cylindrical φ3.6×3.2m steel tank, divided into three grids, and its total volume is 32.6M 3 , the total effective volume is 26.0M 3 . The volume of the first grid is 16.3M 3 , its effective volume is 13.0M 3 , the volumes of the second and third grids are both 8.15M 3 , its effective volume is 6.5M 3 .

[0046] The sodium fluorosilicate production capacity of the device is 5.190t / h, the fluorine yield is 90%, and the addition amount of 100% fluosilicic acid is 4.417t / h. According to the reaction formula, the theoretical addition of brine is calculated. The actual addition of brine is based on 120% of the theoretical addition (wherein 110% is added in the 1st grid, and 10% is added into the 2nd grid).

[0047] The entirety of the fluosilicic acid and 110% of the theoretical amount ...

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Abstract

The invention discloses a method for continuous production of sodium fluosilicate. The method adopts a multi-lattice synthesis tank and forms openings on partition plates or partition walls of lattices of the multi-lattice synthesis tank to communicate with the lattices, wherein no opening is formed on a first lattice and a last lattice, so that the first lattice and the last lattice do not communicate with each other. The method comprises the steps of weighing raw materials of hydrofluosilicic acid and bittern at the same time and adding into the first lattice, stirring and allowing reaction; feeding the reaction slurry into a second lattice under stirring, supplementing hydrofluosilicic acid or / and bittern, and allowing further reaction and crystal growth; and feeding the reaction slurry into a third lattice until the last lattice in sequence for crystal growth. Alternatively, the method can adopt a single-lattice synthesis tank and arrange a plurality of crystal growth tanks at the same time, wherein openings are formed at the tapered bottoms of the single-lattice synthesis tank and each crystal growth tank for discharging. The method comprises the steps of weighing raw materials of hydrofluosilicic acid and bittern at the same time and adding into the single-lattice synthesis tank, stirring and allowing reaction; feeding the reaction slurry into a first crystal growth tank, supplementing hydrofluosilicic acid or / and bittern, and allowing further reaction and crystal growth; and feeding the reaction slurry into a second crystal growth tank until a last crystal growth tank in sequence for crystal growth.

Description

technical field [0001] The present invention relates to the production method of sodium fluorosilicate, more specifically, the present invention relates to a kind of method of continuous production sodium fluorosilicate. Description of drawings [0002] In view of the fact that the description of the present invention is more concise and clear with reference to the accompanying drawings, therefore, the content of the accompanying drawings is briefly described first. [0003] figure 1 It is a schematic flow chart of "intermittent production of sodium fluorosilicate process"; [0004] figure 2 It is a schematic flow chart of the "continuous production of sodium fluorosilicate process" in the prior art; [0005] Fig. 3 is the multi-grid synthesis tank adopted in "continuous production of sodium fluorosilicate-multi-grid synthesis tank technology" of the present invention-preferably positive cylindrical grid shape and regular (rectangular) cube grid combined shape (preferabl...

Claims

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Application Information

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Patent Type & AuthorityApplications(China)
IPC IPC(8): C01B33/32
Inventor吴向东王煜资学民赵剑波
OwnerYUNNAN THREE CIRCLES SINOCHEM FERTILIZERS CO LTD