Device and technology for continuous production of sodium fluosilicate

A technology for sodium fluorosilicate and fluorosilicic acid, which is applied in the field of devices for continuous production of sodium fluorosilicate, can solve the problems of aggravated dilute acid system scaling, low utilization rate of fluorosilicic acid and sodium sulfate, and unreusable mother liquor. , to achieve the effect of alleviating scaling, saving primary water, and improving the utilization rate of Na+

Inactive Publication Date: 2018-05-18
HUBEI SANNING CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At present, the company mixes fluosilicic acid with sodium sulfate and water and then filters it to obtain sodium fluoride product and filter mother liquor. The mother liquor is directly returned to the wet-process phosphoric acid system, so that the mother liquor cannot be reused, resulting in the utilization of fluosilicic acid and sodium sulfate. At the same time, a large amount of wastewater containing sodium ions enters the dilute acid system, which aggravates the fouling phenomenon of the dilute acid system

Method used

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  • Device and technology for continuous production of sodium fluosilicate

Examples

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Effect test

Embodiment 1

[0024] A process for continuous production of sodium fluorosilicate, the process of which is as follows figure 1 shown.

[0025] Use a screw feeder to add 98% industrial grade sodium sulfate at a feed rate of 50kg / h to the dissolution tank, and mix it with the filtrate transported from the filtrate tank. The filtrate flow rate is 320kg / h; the temperature is controlled at 45°C and mixed evenly The final solution is sent to the mixing tank.

[0026] Add 18% fluosilicic acid solution to the mixing tank, the flow rate is 300kg / h, react at room temperature for 1min, transport the reaction slurry to a vacuum belt filter, and obtain a 61kg / h finished product after filtering, washing and drying Sodium fluorosilicate, the purity of the finished sodium fluorosilicate is more than 99%. The filtered mother liquor is sent to the mother liquor settling tank. After settling for 5 hours, it is sent to the filter press for pressure filtration. Part of the filtrate separated from the colloidal...

Embodiment 2

[0028] Use a screw feeder to add 98% industrial grade sodium sulfate at a feed rate of 50kg / h to the dissolution tank, and mix it with the filtrate transported from the filtrate tank. The filtrate flow rate is 320kg / h; the temperature is controlled at 45°C and mixed evenly The final solution is sent to the mixing tank.

[0029] Add 18% fluosilicic acid solution to the mixing tank, the flow rate is 310kg / h, react at room temperature for 1min, transport the reaction slurry to a vacuum belt filter, and obtain a 60kg / h finished product after filtering, washing and drying Sodium fluorosilicate, the purity of the finished sodium fluorosilicate is more than 99%. The filtered mother liquor is sent to the mother liquor settling tank. After settling for 5 hours, it is sent to the filter press for pressure filtration. Part of the filtrate separated from the colloidal slag is returned to the dissolution tank to dissolve sulfuric acid. Sodium, the other part is sent to the phosphoric acid ...

Embodiment 3

[0031] Use a screw feeder to add 98% industrial grade sodium sulfate at a feed rate of 50kg / h to the dissolution tank, and mix it with the filtrate transported from the filtrate tank. The filtrate flow rate is 320kg / h; the temperature is controlled at 45°C and mixed evenly The final solution is sent to the mixing tank.

[0032] Add 20% fluosilicic acid solution to the mixing tank, the flow rate is 300kg / h, react at room temperature for 3min, transfer the reaction slurry to a vacuum belt filter, and obtain a 65kg / h finished product after filtering, washing and drying Sodium fluorosilicate, the purity of the finished sodium fluorosilicate is more than 99%. The filtered mother liquor is sent to the mother liquor settling tank. After settling for 5 hours, it is sent to the filter press for pressure filtration. Part of the filtrate separated from the colloidal slag is returned to the dissolution tank to dissolve sulfuric acid. Sodium, the other part is sent to the phosphoric acid s...

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Abstract

The invention provides a device and a technology for continuous production of sodium fluosilicate. The device comprises a dissolving tank, a mixing tank, first filtering equipment, a mother liquid settling tank, second filtering equipment and a filtrate tank which are sequentially connected, wherein the filtrate tank is connected with the dissolving tank. The technology comprises the following production steps of dissolving sodium sulfate into the dissolving tank; sending into the mixing tank, and reacting with a sodium fluosilicate solution for 1 to 3min; filtering the liquid after reaction by the first filtering equipment, and washing and drying filter residues, so as to obtain sodium fluosilicate; sending the filtrate into the mother liquid settling tank to settle, and filtering by thesecond filtering equipment; returning the obtained filtrate back into the dissolving tank to dissolve the sodium sulfate. The device and the technology have the advantages that the filtrate filtered by the second filtering equipment is used as the liquid for dissolving the sodium sulfate, the utilization rates of SiF6<2-> and Na<+> are greatly improved, the primary water usage amount is greatly reduced, and the production of wastewater is reduced.

Description

technical field [0001] The invention belongs to the technical field of sodium fluorosilicate, in particular to a device and process for continuously producing sodium fluorosilicate. Background technique [0002] In the wet-process phosphoric acid industry, a large amount of by-products, fluorosilicic acid and silica gel, will be produced. At present, the company mixes fluosilicic acid with sodium sulfate and water and then filters it to obtain sodium fluoride product and filter mother liquor. The mother liquor is directly returned to the wet-process phosphoric acid system, so that the mother liquor cannot be reused, resulting in the utilization of fluosilicic acid and sodium sulfate. At the same time, a large amount of wastewater containing sodium ions enters the dilute acid system, which aggravates the scaling phenomenon of the dilute acid system. Contents of the invention [0003] The technical problem to be solved by the present invention is to provide a device and pro...

Claims

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Application Information

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IPC IPC(8): C01B33/10
CPCC01B33/103C01P2006/80
Inventor 方超田承涛肖林波周玲玲徐思红
Owner HUBEI SANNING CHEM
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