Waste acid treatment system
A waste acid treatment and pipeline technology, applied in filtration treatment, water/sewage multi-stage treatment, heating water/sewage treatment, etc., can solve the problems of unsuitable for small and medium-sized enterprises, high cost of fluorine treatment, large lime consumption, etc. Achieve high utilization value, reduce energy consumption, and reduce fouling
Inactive Publication Date: 2021-11-30
山东永达环保科技有限公司
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Problems solved by technology
[0004] Aiming at the deficiencies of the prior art, the present invention provides a waste acid treatment system, which has the advantages of recycling nitric acid-hydrofluoric acid and other mixed acids, recovering nitric acid-hydrofluoric acid and other mixed acids with high concentration and high utilization value, etc., and solves the problem of Lime consumption is very large, a large amount of hazardous waste sludge will be generated, which requires secondary disposal, and the cost of total nitrogen and fluorine treatment in waste liquid is high. Resin adsorption recovery method + neutralization treatment + biological denitrification method can recover part of the free acid , but the recovered acid contains metal salts, and the separation rate is unstable, and the combined acid still needs to be neutralized. The spray roasting method can recycle metals and hydrofluoric acid, but the investment cost is very high, which is not suitable for small and medium-sized enterprises.
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[0019] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some of the embodiments of the present invention, not all of them.
[0020] Examples of the described embodiments are shown in the drawings, wherein like or similar reference numerals designate like or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the figures are exemplary and are intended to explain the present invention and should not be construed as limiting the present invention.
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The invention relates to the technical field of recycling treatment of waste pickling liquid in the photovoltaic industry, and discloses a waste acid treatment system. The waste acid treatment system comprises a preheater, an evaporator, a vacuum condenser, a tail gas recoverer, a preheating tank, a vacuum crystallizer, a vacuum filter, a concentration separator, a vacuum collection tank, a vacuum buffer tank, a vacuum filtering tank, a tail gas recovery liquid tank, a vacuum unit, a preheating pump and a feeding pump. According to the waste acid treatment system, a part of acidic water is collected through evaporation, and then mixed acid such as nitric acid and hydrofluoric acid is recycled, so the concentration of regenerated acid can be effectively improved, the utilization value of the recycled acid is improved, the purpose of reducing an evaporation temperature, improving an evaporation speed, reducing energy consumption, decreasing material scaling and ensuring normal operation of the evaporator are achieved, and resourceful treatment of nitric acid-hydrofluoric acid and other mixed acids, high concentration of recovered mixed acids and high utilization value are achieved.
Description
technical field [0001] The invention relates to the technical field of recovery and treatment of pickling waste liquid in the photovoltaic industry, in particular to a waste acid treatment system. Background technique [0002] The existing waste acid treatment system generally adopts neutralization method, resin adsorption method, and roasting method, but the lime neutralization method + biological denitrification method is simple in process, but the lime consumption is very large, and a large amount of hazardous waste sludge will be generated. Secondary disposal, and the cost of total nitrogen and fluorine in the waste liquid is high. Resin adsorption recovery method + neutralization treatment + biological denitrification method can recover part of the free acid, but the recovered acid contains metal salts, and the separation rate is unstable. The acid still needs to be neutralized. The spray roasting method can recycle metals and hydrofluoric acid, but the investment cost ...
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IPC IPC(8): C02F9/10
CPCC02F1/06C02F1/001
Inventor 钱占虎
Owner 山东永达环保科技有限公司