Preparation process of prodan by sodium sulfate method

A technology of sodium fluorosilicate and sodium sulfate, which is applied in the technical field of producing sodium fluorosilicate by the sodium sulfate method, can solve the problems of difficult control of feeding speed, increase of silica gel, and blockage of equipment, and achieve better quality, higher utilization rate, Produce easily controlled effects

Inactive Publication Date: 2008-10-15
NORTHWEST UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In fact, during the wet production of sodium sulfate, since the sodium sulfate solution is in a saturated state and its solubility changes significantly with temperature, attention must be paid to the heat preservation of the chemical salt and the pipeline of the conveying equipment, otherwise it may be precipitated at any time and block the equipment or pipeline. On the one hand, when the temperature of the mother liquor is high, the hydrolysis of sodium fluorosilicate in the acidic medium is accelerated, which not only increases the loss of

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  • Preparation process of prodan by sodium sulfate method
  • Preparation process of prodan by sodium sulfate method
  • Preparation process of prodan by sodium sulfate method

Examples

Experimental program
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Effect test

Embodiment 1

[0041] Embodiment 1, be 21m with the brine storage tank volume 3 , the salt concentration is 15% (density 1.135g / ml), the fluosilicic acid concentration is 10% (density 1.082g / ml), and the acid storage capacity is 47m 3 , the synthesis tank volume is 7m 3 as an example.

[0042] If the ratio of fluosilicic acid to sodium sulfate is 1:1.2, add 4.33m of fluosilicic acid each time 3 , add salt 2.67m 3 , batch synthesis, a total of 9 reactions are required. First in the synthetic tank salt 2.7m 3 , and then discharged into the chemical salt storage tank, take the acid to adjust the salt, and enter 4.33m of fluosilicic acid into the synthesis tank 3 , add salt solution 2.67m 3 After the reaction, continue to add solid sodium sulfate, so that the sodium sulfate content of the mother liquor is 15%. After settling, the mother liquor enters the chemical salt storage tank, and is washed by sodium fluorosilicate and then centrifugally dried. React salt three times like this, wait ...

Embodiment 2

[0043] Embodiment 2, be 34m with the saline solution storage tank volume 3 , salt concentration 16% (density 1.148g / ml), fluosilicic acid concentration 8% (density 1.065g / ml), acid storage capacity 61m 3 , the synthesis tank volume is 10m 3 as an example.

[0044] If the ratio of fluosilicic acid to sodium sulfate is still 1:1.2, add 6.47m of fluosilicic acid each time 3 , add salt 3.53m 3 , Batch synthesis, a total of about 10 reactions are required. First in synthetic tank salt 3.53m 3 , and then discharged into the salt storage tank. Adjust the acid and adjust the salt, and enter 6.47m of fluosilicic acid into the synthesis tank 3 , add salt solution 3.53m 3 After the reaction, continue to add solid sodium sulfate, so that the sodium sulfate content of the mother liquor is 16%. After settling, the mother liquor enters the chemical salt storage tank, and is washed by sodium fluorosilicate and then centrifugally dried. React salt three times like this, wait for the sa...

Embodiment 3

[0045] Embodiment 3, be 44m with the saline solution storage tank volume 3 , the salt concentration is 16%, the fluosilicic acid concentration is 9%, and the acid storage capacity is 78m 3 , the synthesis tank volume is 12m 3 as an example.

[0046] If the ratio of fluosilicic acid to sodium sulfate is 1:1.1, add 7.65m of fluosilicic acid each time 3 , add salt 4.35m 3 , intermittent synthesis, a total of 10 reactions are required. First in the synthetic tank salt 4.35m 3 , and then discharged into the salt storage tank. Take fixed acid and adjust salt, and enter 7.65m of fluosilicic acid into the synthesis tank 3 , add salt solution 4.35m 3 After the reaction, continue to add solid sodium sulfate, so that the sodium sulfate content of the mother liquor is 16%. After settling, the mother liquor enters the chemical salt storage tank, and is washed by sodium fluorosilicate and then centrifugally dried. React salt four times like this, wait for the salt solution tank to b...

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Abstract

The invention discloses a process for producing sodium fluosilicate by using sodium sulfate, which comprises the following steps: (1) subjecting the solution of hydrofluorosilicic acid and sodium sulfate with the mol ratio of 1:1.0 to 1.2 to reaction and crystallization; (2) adding solid sodium sulfate to the reaction solution for salt dissolution till the mass percent concentration of the sodium sulfate reaches 15 to 20%; (3) separating the sodium fluosilicate; (4) subjecting the mother solution slating liquid to a circulated process of salt dissolution and reaction. The method utilizes the water of the hydrofluorosilicic acid, saves a large part of water for the salt dissolution and reduces the production of sewage; the salt dissolution by the mother solution is to continue to add excess amount of salt so as to continue to enlarge the size of hydrofluorosilicic acid crystals and increase the precipitation quantity. The utilization rate of the hydrofluorosilicic acid can reach to above 96%, which is far higher than the level of around 80% by prior solution method.

Description

technical field [0001] The invention relates to a process for recovering fluorine in a phosphorus compound fertilizer plant and producing sodium fluorosilicate using sodium sulfate as a raw material, which belongs to the process improvement of the inorganic chemical product sodium fluorosilicate. technical background [0002] Since phosphate rock generally contains about 3% fluorine, in the production process of ordinary calcium, heavy calcium and wet-process phosphoric acid, in order to protect the environment, comprehensively select resources and improve the economic benefits of enterprises, it is necessary to treat the fluorine-containing exhaust gas, and the fluorine-containing waste gas must be treated. It is absorbed and converted into fluorosilicic acid, which is used to produce market-effective fluoride salt products. Among the fluoride salt products currently produced, sodium fluorosilicate is relatively common. (Fertilizer Engineering Series "Phosphoric Acid, Phos...

Claims

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Application Information

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IPC IPC(8): C01B33/32
Inventor 曹劲松姚瑞清陈开勋秦宝福王发定
Owner NORTHWEST UNIV
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