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Hydrolytic agent for treating wastewater containing tetrafluoroborate and application thereof

A technology of fluorine-containing boric acid and hydrolysis agent, which is applied in water/sewage treatment, water/sludge/sewage treatment, water pollutants, etc., can solve the problems of undisclosed hydrolysis agent, long hydrolysis time, and low concentration, and achieve shortening Subsequent treatment process, short hydrolysis time, good effect

Active Publication Date: 2013-06-12
CHINA PETROLEUM & CHEM CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] Wang Yuze et al. (BF 4 - Wastewater hydrolysis experiment, China Environmental Science, 1999, 19 (1): 56-58) carried out BF 4 - Wastewater hydrolysis experiment, studied the effect of aluminum salt, aluminum salt and hydrolyzing agent on BF 4 - The hydrolysis of wastewater, pointed out that the use of aluminum salts and hydrolysis aids can make BF 4 - achieve high-efficiency hydrolysis, but the BF of the wastewater it treats 4 - Low concentration and undisclosed substance of hydrolyzing agent
Its other disadvantage is that the amount of aluminum salt used as hydrolyzing agent is large, and the BF used to treat wastewater 4 - Low concentration, long hydrolysis time when reaching high hydrolysis rate

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] In a two-necked flask equipped with a stirrer and a thermometer, add 100 mL of waste water containing fluoroborate and fluoride ions, wherein the concentration of fluoroborate ions is 5000 mg / L, and the concentration of fluoride ions is 10000 mg / L. Place the flask in a constant temperature water bath, and after the temperature rises to 70°C, keep the temperature constant, add 2.3g of aluminum chloride, stir for 2 minutes, then add 0.02g of cerium chloride, and stir for 15 minutes. Immediately stop stirring, and stand at 70°C for 1h. Take 10ml of treated wastewater, observe its appearance and analyze the concentration and pH value of fluoroborate ions. The results are shown in Table 1.

Embodiment 2

[0036] In a two-necked flask equipped with a stirrer and a thermometer, add 100 mL of waste water containing fluoroborate and fluoride ions, wherein the concentration of fluoroborate ions is 8000 mg / L, and the concentration of fluoride ions is 8000 mg / L. The flask was placed in a constant temperature water bath, and after the temperature rose to 50°C, the temperature was kept constant, and 5.0 g of aluminum sulfate was added, followed by 0.5 g of cerium nitrate, and stirred for 10 min. Immediately stop stirring, and stand at 50°C for 2h. Take 10ml of the reaction solution to analyze the concentration and pH value of the remaining fluoroborate ions.

Embodiment 3

[0038] In a two-necked flask equipped with a stirrer and a thermometer, add 100 mL of waste water containing fluoroborate and fluoride ions, wherein the concentration of fluoroborate ions is 10000 mg / L, and the concentration of fluoride ions is 5000 mg / L. The flask was placed in a constant temperature water bath, and after the temperature rose to 80°C, the temperature was kept constant, and 15.0 g of alum was added, followed by 0.5 g of cerium sulfate, and stirred for 20 min. Let stand for 1h. Take 10ml of the reaction solution to analyze the concentration and pH value of the remaining fluoroborate ions.

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Abstract

The invention provides a hydrolytic agent for treating wastewater containing tetrafluoroborate and application thereof. The hydrolytic agent consists of at least one aluminum salt and at least one water-soluble cerate. The aluminum salt is selected from alum, aluminum chloride or hydrate of the aluminum chloride, aluminum sulfate or hydrate of the aluminum sulfate, and preferable the alum; and the water-soluble cerat is selected from cerium nitrate, cerous sulfate and cerium chloride, and the preferable the cerium chloride. The hydrolytic agent disclosed by the invention is used for treating the wastewater containing tetrafluoroborate, thus the consumption of the aluminum salt contained in the hydrolytic agent can be reduced on the one hand and the concentration of the tetrafluoroborate in the hydrated wastewater can be reduced on the other hand, which provide advantages for subsequent treatment. After the wastewater is continuously precipitated by lime milk or CaOH2, the concentration of the tetrafluoroborate and the concentration of fluorinion are respectively reduced and reach the discharge stand, and thus the etrafluoroborate and the fluorinion can be directly discharged and further the subsequent treatment flow is shortened.

Description

technical field [0001] The invention relates to a hydrolyzing agent for treating fluorine-containing borate waste water and its application, in particular to a hydrolyzing agent for treating fluorine-containing borate waste water and its application. Background technique [0002] Fluoroboric acid is a very stable compound in which fluorine is coordinated to boron. Due to the good throwing ability of the fluoroboric acid plating solution, the fast deposition rate and the stability of the plating solution, the electroplating containing fluoroboric acid has been widely used in printed circuit boards and automobile bearing bushes, as well as composite electroplating of some ternary metals. The electroplating wastewater discharged from the production process contains a large amount of BF 4 - , it will slowly hydrolyze in water, releasing a large amount of F during hydrolysis - , resulting in serious fluorine pollution. Fluorine pollution is increasingly concerned by people. I...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F1/58C02F101/14
Inventor 秦会敏郦和生刘伟王岽
Owner CHINA PETROLEUM & CHEM CORP
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