Carbon dioxide decalcification system suitable for gypsum neutralization process after-treatment liquid and method thereof
A carbon dioxide and gypsum technology, applied in chemical instruments and methods, water softening, metallurgical wastewater treatment, etc., can solve the problems of high chemical cost, high chemical cost, increased carbon dioxide storage, etc., and achieve cost savings, stable operation, and energy saving The effect of running costs
Pending Publication Date: 2019-02-26
CHINA NERIN ENG
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Problems solved by technology
At present, the methods for decalcification of wastewater are mainly sodium carbonate method and carbon dioxide method. The former has good calcium removal effect, but the chemical cost is high. The latter generally uses purchased carbon dioxide as the calcium removal agent, and the cost of treatment agent is 30% to 40% of the former, but Need to increase carbon dioxide storage, replacement, dosing and other supporting equipment
The traditional decalcification process removes calcium ions in the neutralized liquid. Based on the effluent Ca concentration of 250mg / L, the cost of chemicals for carbon dioxide or sodium carbonate alone reaches 1-1.2 and 2-2.3 yuan respectively. The relatively high cost of chemicals is the current traditional The biggest limitation of wastewater calcium removal process
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[0034] Embodiments of the present invention are described in detail below, examples of which are shown in the drawings, wherein the same or similar reference numerals designate the same 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.
[0035] In the present invention, unless otherwise clearly specified and limited, terms such as "installation", "connection", "connection" and "fixation" should be understood in a broad sense, for example, it can be a fixed connection or a detachable connection , or integrated; it may be mechanically connected or electrically connected; it may be directly connected or indirectly connected through an intermediary, and it may be the internal communication of two components or the interaction relationship between two components, unles...
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The invention discloses a carbon dioxide decalcification system suitable for gypsum neutralization process after-treatment liquid and a method thereof. The system comprises a gypsum reaction tank having a limestone milk inlet, a waste acid inlet containing sulfuric acid, a carbon dioxide outlet, a gypsum outlet, and an after-reaction liquid outlet; a neutralization reaction device having an after-reaction liquid inlet, a lime milk inlet, an iron salt inlet, a sedimentation outlet, and an after-neutralization liquid outlet; an aeration reaction tank having an after-neutralization liquid inlet,a carbon dioxide inlet, and a mixed liquid outlet; a flocculation reaction tank having a mixed liquid inlet, a flocculant inlet, and an after-flocculated liquid outlet; and a filtration device havinga post-flocculation liquid inlet, a filtered liquid outlet, and a calcium carbonate outlet, wherein the calcium carbonate outlet is connected to the limestone milk inlet.
Description
technical field [0001] The invention belongs to the field of waste water treatment, in particular, the invention relates to a carbon dioxide decalcification system and method suitable for liquid after treatment in a gypsum neutralization process. Background technique [0002] At present, most of the acid wastewater produced by non-ferrous smelting enterprises is treated by the gypsum neutralization process, that is, the limestone milk is used to neutralize the waste acid to make gypsum, and most of the free acid and fluoride ions are removed, and then the lime milk and iron salt are used to remove the wastewater. heavy metal ions in. Even if the neutralized liquid obtained by this method meets the standard, according to the requirements of the national environmental protection, all of them need to be reused. Regardless of whether it is directly reused or reused after advanced treatment, it is necessary to remove calcium ions in the wastewater to reduce the hardness of the wa...
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IPC IPC(8): C02F9/04C02F101/20C02F103/16
CPCC02F9/00C02F2101/20C02F2103/16C02F5/02C02F5/06
Inventor 明亮吴国平饶剑锋王小艳勒德智唐芬芬
Owner CHINA NERIN ENG