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A method for recycling photovoltaic fluorine-containing wastewater

A recycling and waste water technology, applied in chemical instruments and methods, calcium/strontium/barium fluoride, water pollutants, etc., can solve problems such as waste, residual lime residue, solid waste fluorine resources, etc., and achieve increased utilization High efficiency, improved quality, and low energy consumption

Active Publication Date: 2022-04-15
NANJING UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, this method also has a series of problems such as a large amount of lime residue remaining after precipitation, which is mixed with the generated calcium fluoride sludge and discarded, resulting in a large amount of solid waste and waste of fluorine resources.

Method used

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  • A method for recycling photovoltaic fluorine-containing wastewater
  • A method for recycling photovoltaic fluorine-containing wastewater
  • A method for recycling photovoltaic fluorine-containing wastewater

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] S1: Configure the calcium chloride reaction solution for the reaction and treatment of photovoltaic fluorine-containing wastewater through the calcium chloride configuration tank, and wait for use; the preparation of the calcium chloride reaction solution is 74.5g / 100mL saturated calcium chloride solution;

[0045] S2: The calcium chloride reaction solution is added dropwise to the reaction pool in multiple points for mixed reaction with the photovoltaic fluorine-containing wastewater under acidic conditions of pH=1~2, and the dosage of the calcium chloride reaction solution is according to Ca:F=1: The molar ratio of 2 is added, and the stirring speed is 500rpm to obtain the reaction mixture; the calcium fluoride seed crystals accounting for 15g / L of photovoltaic fluorine-containing wastewater injection are also added in the calcium chloride reaction solution; by adding the above-mentioned dosage The strong agent can effectively promote the output of calcium fluoride pre...

Embodiment 2

[0048] This example is basically the same as Example 1, except that the stirring speed of the calcium chloride reaction liquid and photovoltaic fluorine-containing wastewater is different when they are mixed dropwise, specifically as follows: the stirring speed is 200 rpm.

Embodiment 3

[0050] This example is basically the same as Example 1, except that the stirring speed of the calcium chloride reaction liquid and photovoltaic fluorine-containing wastewater is different when they are mixed dropwise, specifically as follows: the stirring speed is 1000 rpm.

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Abstract

The invention discloses a method for recycling photovoltaic fluorine-containing waste water, which comprises the following steps: S1: disposing saturated calcium chloride reaction solution through a calcium chloride configuration tank for use; S2: mixing fluorine-containing waste water and calcium chloride reaction solution Add it into the reaction tank for mixed reaction to obtain the reaction mixture; S3: Then pass the reaction mixture into the sedimentation tank for precipitation, the supernatant overflows and discharges the treated photovoltaic fluorine-containing wastewater, and obtains fluorine that can be recycled as a resource Calcium; the device includes a calcium chloride configuration tank, a reaction tank, and a sedimentation tank that are connected in sequence. The middle part of the reaction tank is equipped with a stirring assembly that can improve the stirring efficiency, and the upper part of the reaction tank is also equipped with a liquid distribution device that can prevent and clear clogging. components. The photovoltaic fluorine-containing waste water recycling method and device provided by the present invention can realize high-efficiency removal of fluorine and standard discharge under acidic conditions, and can also recover high-purity calcium fluoride that can replace fluorite, and has a good application prospect.

Description

technical field [0001] The invention relates to the technical field of wastewater treatment and resource utilization, in particular to a method for resource utilization of photovoltaic fluorine-containing wastewater. Background technique [0002] In the photovoltaic industry related to the production of solar cells, solar modules, solar cells and module manufacturing, the production process will inevitably produce fluorine-containing wastewater with strong acidity (pH=1-2) and high fluorine content (4000-15000mg / L) , This type of wastewater is highly toxic and harmful. Therefore, effective treatment of such wastewater is of great significance to promote the green and sustainable development of the photovoltaic industry. [0003] At present, the most common method for the treatment of acidic high-fluorine industrial wastewater is calcium salt precipitation (slaked lime or milk of lime). However, this method also has a series of problems such as a large amount of lime residu...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F1/58C01F11/22C02F101/14C02F103/34
CPCC02F1/583C01F11/22C02F2101/14C02F2001/007C02F2103/34
Inventor 吕路莫思琦王林平徐敬生张炜铭潘丙才
Owner NANJING UNIV
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