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Technology of preparing sodium hydrogen fluoride by using fluosilicic acid, a by-product of phosphorus chemical industry

A technology of sodium hydrogen fluoride and fluosilicic acid, which is applied in the field of phosphorus chemical industry, can solve problems such as the difficulty of economical utilization of fluosilicic acid and the shortage of fluorine resources, and achieve the effects of solving environmental damage and pollution, saving costs, and having a wide range of raw material sources

Active Publication Date: 2017-09-29
YUNNAN PHOSPHATE CHEM GROUP CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The present invention aims at the problem of lack of fluorine resources currently using fluorite as raw material and the problem that low-concentration fluorosilicic acid, a by-product of phosphorus chemical industry, is difficult to be economically utilized. High value-added sodium hydrogen fluoride technology, the smooth implementation of this technology not only solves the environmental damage and pollution caused by the discharge of fluosilicic acid wastewater, but also prepares high value-added sodium hydrogen fluoride, which has significant social, environmental and economic benefits

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] The present invention adopts the technology of preparing sodium hydrogen fluoride by fluosilicic acid, a by-product of phosphorus chemical industry, and its process steps are:

[0018] The preparation of step (1) hydrofluoric acid: join: 116.6kg NaF solid joins the fluosilicic acid of 10% in 2000kg concentration, 20 ℃ of stirring 5h, filter, and filtrate is the hydrofluoric acid solution of 2.9%, and filter cake is Na 2 SiF 6 Enter downstream to prepare sodium fluoride;

[0019] Step (2) Preparation of sodium bifluoride: 1000 kg of hydrofluoric acid solution in step (1), add 63 kg of sodium fluoride solid, stir at 20° C. for 3 h, concentrate under reduced pressure until the concentration of sodium bifluoride is 20%, filter, and the filter cake is hydrogen fluoride Sodium, drying, packaging is the finished product, and the filtrate is combined with the hydrofluoric acid solution in step (1).

[0020] The preparation of step (3) sodium fluoride: Na in step (1) will be ...

Embodiment 2

[0023] Step (1) Preparation of hydrofluoric acid: 175kg of NaF solid obtained in Example 1 is added to 2000kg of 15% fluosilicic acid, stirred at 30°C for 5h, filtered, the filtrate is 4.7% hydrofluoric acid solution, and the filter cake is Na 2 SiF 6 enter the downstream and then prepare sodium fluoride;

[0024] The preparation of step (2) sodium bifluoride: 1000kg of hydrofluoric acid solution in the step (1), add sodium fluoride solid 98.7kg, 30 ℃ of stirring 2h, concentrating under reduced pressure to the concentration of sodium bifluoride is 30%, filters, and filter cake is Sodium bifluoride, drying, packaging is the finished product, and the filtrate is combined with the hydrofluoric acid solution in step (1).

[0025] The preparation of step (2) sodium fluoride: with 2000kg Na 2 SiF 6 Added to 8768kg 25% Na 2 CO 3 In the solution, stir at 60°C for 2h, clear after the reaction, and the upper layer is SiO 2 Suspension, the lower layer of precipitation is NaF solid,...

Embodiment 3

[0027] Step (1) Preparation of hydrofluoric acid: 233.4kg NaF solid is added to 1000kg concentration of 20% fluosilicic acid, stirred at 40°C for 1h, filtered, the filtrate is 6.6% hydrofluoric acid solution, and the filter cake is Na 2 SiF 6 Enter downstream to prepare sodium fluoride;

[0028] The preparation of step (2) sodium bifluoride: 1000kg of hydrofluoric acid solution in the step (1), add sodium fluoride solid 138.6kg, 40 ℃ of stirring 5h, concentrating under reduced pressure to sodium bifluoride concentration is 40%, filters, and filter cake is Sodium bifluoride, drying, packaging is the finished product, and the filtrate is combined with the hydrofluoric acid solution in step (1).

[0029] The preparation of step (2) sodium fluoride: with 2000kg Na 2 SiF 6 Added to 5480kg 40% Na 2 CO 3 In the solution, stir at 80°C for 1h, after the reaction, it becomes clear and the upper layer is SiO 2 Suspension, the lower layer of precipitation is NaF solid, and NaF solid...

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Abstract

The invention discloses a technique of preparing sodium bifluoride by using the phosphorus chemical industry byproduct fluorosilicic acid and belongs to the field of phosphorus chemical industry. The phosphorus chemical industry byproduct fluorosilicic acid is used as a raw material and prepared into the sodium bifluoride via the steps of (1), adding fluorosilicic acid solution into sodium fluoride solid, stirring, and press-filtering to obtain the filtrate low-concentration hydrofluoric acid and the filter cake sodium fluosilicate; (2), adding the sodium fluoride solid into the low-concentration hydrofluoric acid solution at a stoichiometric ratio, stirring well, charging into a concentrating system, cooling and crystallizing concentrate, drying obtained solid to obtain finished sodium bifluoride; (3), adding the sodium fluosilicate solid of step (1) into sodium carbonate solution for chemical reaction, standing for layering after reaction is over to obtain the upper layer silica gel suspension and the lower layer sodium fluoride solid, press-filtering the lower layer sodium fluoride to obtain sodium fluoride solid that is used as a raw material for the steps (1) and (2).

Description

technical field [0001] The invention belongs to the field of phosphorus chemical industry. In particular, it relates to a technology for preparing sodium hydrogen fluoride by using fluosilicic acid, a by-product of phosphorus chemical industry. Background technique [0002] Sodium bifluoride is a white particle, which is easily decomposed into sodium fluoride and hydrogen fluoride when heated. It has a strong sour taste and is easy to absorb moisture. Sodium bifluoride is widely used, mainly used as food protection agent, animal and plant specimens and anatomical specimen preservation agent and preservative, also used in acid-resistant cement, masonry cleaner, disinfectant, glass etchant, leather treatment agent, welding aid, stainless steel Pickling and textile treatment agents, etc. [0003] At present, the preparation technology of sodium bifluoride mainly includes: prepare hydrofluoric acid solution (containing about 40% HF) or anhydrous hydrogen fluoride with fluorite...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01D3/02
CPCC01D3/02C01P2006/80
Inventor 张晖周琼波何宾宾李耀基韩增辉陆伟才彭千山方竹堃赵智波牛司江
Owner YUNNAN PHOSPHATE CHEM GROUP CORP
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