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Multi-grade comprehensive utilization technology of fluoride-contained waste acid in phosphating industry

An industrial and fluorosilicic acid technology, applied in the multi-stage comprehensive utilization of fluorine-containing waste acid in the phosphating industry, which can solve the problems of high treatment costs, environmental pollution resources, and lack of good technical solutions.

Active Publication Date: 2011-05-04
湖北永绍科技股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] The above-mentioned waste acid water from the phosphating industry—fluorosilicic acid (H 2 SiF 6 ) process waste acid water produced by sodium fluorosilicate and fluorine-containing solid waste hydrated silicic acid (SiO 2 ) have problems of environmental pollution or resource waste or high processing costs that have always plagued similar companies, and there has been no good technical solution

Method used

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  • Multi-grade comprehensive utilization technology of fluoride-contained waste acid in phosphating industry

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] ①. Preparation of sodium fluorosilicate and dilute hydrochloric acid water

[0042] Raw material ratio:

[0043] Fluorosilicate (H 2 SiF 6 , concentration 11%): 10L

[0044] Sodium chloride (NaCl, concentration 25%): 4L

[0045] The above-mentioned fluorosilicic acid (H 2 SiF 6 ) into a reaction barrel with a volume of 20L, add the above-mentioned sodium chloride solution to react with it for 30 minutes and then let it stand for 30 minutes, carry out suction filtration, and obtain sodium fluorosilicate product through dehydration and drying. In the one-step processing link, after testing, the concentration of hydrochloric acid in the filtrate is 4.85%.

[0046] ②. Preparation of aluminum fluoride and hydrated silicic acid (SiO 2 )

[0047] Raw material ratio:

[0048] Fluorosilicate (H 2 SiF 6 , concentration 17%): 30L

[0049] Aluminum hydroxide Al(OH) 3 : 6.3kg

[0050] Take 30L of fluosilicic acid with the above concentration and put it into a plastic-l...

Embodiment 2

[0070] 1. Modulate the concentration of fluosilicic acid with the cryolite filtrate obtained in 4 in Example 1 to prepare sodium fluosilicate and dilute hydrochloric acid water.

[0071] Raw material ratio:

[0072] Cryolite filtrate: 4.6L

[0073] Fluorosilicate (H 2 SiF 6 , concentration 17%): 6.8L

[0074] Sodium chloride (NaCl, concentration 25%): 5.5L

[0075] Take 4.6L of the filtrate after cryolite preparation in Item 4 of Example 1, add 6.8L of 17% fluosilicic acid, 5.5L of 25% sodium chloride solution, and stir the reaction in a reaction tank with a volume of 20L After 30 minutes, stop stirring, let stand for 30 minutes, and perform suction filtration to obtain sodium fluorosilicate product. Measured its Na 2 SiF 6 Content is 98.46%, and its filtrate is processed the same as embodiment 1 to produce aluminum fluoride by-product --- hydrated silicic acid (SiO 2 ) of the leaching solution, the steps of the latter stages are the same as in Example 1, and its react...

Embodiment 3

[0077] 1. Add sodium hydroxide (NaOH) to the silicon dioxide filtrate obtained in the same manner as 1, 2, and 3 in Example 1 to produce cryolite.

[0078] Raw material ratio:

[0079] Silica filtrate: 10L

[0080] Sodium hydroxide: 513g

[0081] Hydrofluoric acid (HF, concentration 40%): 850g

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Abstract

The invention discloses a multi-grade comprehensive utilization technology of fluoride-contained waste acid in a phosphating industry. The main composition of the fluoride-contained waste acid is a fluosilicic acid; the low-concentration fluosilicic acid and a sodium chloride react to prepare a sodium fluosilicate and a diluted hydrochloric acid; the high-concentration fluosilicic acid and an aluminium hydroxide react to prepare an aluminium fluoride and a silicate hydrate; the diluted hydrochloric acid and the silicate hydrate are sequentially poured into a reaction tank, mixed and heated toa boiling state; after standing and filtering, the silicon dioxide product is obtained; the silicon dioxide filtrate is arranged in a reactor and is heated; subsequently, a calcined soda or a causticsoda is slowly added in the reactor; the mixed solution is mixed and reacts; subsequently, the upper clear liquid is overflowed and a hydrofluoric acid is added in the concentrated slurry at the bottom so as to react; subsequently, the solid and liquid separation is carried out so as to obtain the cryolite product; the cryolite filtrate is recycled and used for adjusting the concentration of the fluosilicic acid or sodium chloride when preparing the sodium fluosilicate; and the technology sufficiently utilizes the useful compositions in the waste materials to obtain various products, achievesthe objects of treating the waste by waste, protecting environment and improving efficiency, and solves the problem that the treatment cost of the fluoride-contained waste acid is excessively high.

Description

Technical field: [0001] The invention relates to the field of inorganic chemical industry, in particular to the multi-stage comprehensive utilization technology of fluorine-containing waste acid in the phosphating industry. Background technique: [0002] my country is rich in phosphate rock resources. In recent years, the phosphating industry has developed rapidly. Phosphate rocks generally contain a certain amount of fluorine. During the development and utilization of phosphate rock resources, the released hydrogen fluoride (HF) gas and The impurity silicon dioxide (SiO 2 ) react to form silicon tetrafluoride (SiF 4 ) harmful gas, in order to solve the problem of environmental pollution, the method usually used in the phosphating industry is to absorb silicon tetrafluoride (SiF 4 ) and make it into fluorosilicic acid solution, its chemical reaction formula is: [0003] 4HF+SiO2 2 →SiF 4 ↑+2H 2 o [0004] 3SiF 4 +4H 2 O→2H 2 SiF 6 +SiO2 2 +2H 2 o [0005] For th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B33/10C01B33/12C01F7/50C01F7/54
Inventor 王永进郭忠诚王小赫邹菁
Owner 湖北永绍科技股份有限公司
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