A method for recovering high-quality industrial salt from desulfurization wastewater in coal-fired power plants

A technology for desulfurization wastewater and coal-fired power plants, applied in water softening, chemical instruments and methods, water pollutants, etc., can solve problems such as waste of resources, mineralized soil of water resources, alkalization, etc., to avoid impurities and particle size distribution Uniform, high product quality results

Active Publication Date: 2017-12-29
武汉科技大学资产经营有限公司
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Problems solved by technology

After the desulfurization wastewater is treated, although the wastewater can be discharged up to the standard, it is still wastewater with high salt content and high chloride radicals. It is not only highly corrosive, but also leads to mineralization of water resources and alkalization of soil. embodiment of waste

Method used

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Embodiment

[0018] A method for recovering high-quality industrial salt from desulfurization wastewater in coal-fired power plants, the specific steps of which are:

[0019] Step 1. Pretreat the desulfurization wastewater of the coal-fired power plant. Under the condition of 100-300r / min, first add the chemical precipitant Ca(OH) to the wastewater 2 , adjust the wastewater pH=8~10, stir for 10~40min and then filter, add flocculant to the filtrate, stir for 10~40min and then filter, add Na to the filtrate 2 CO 3 Soften the calcium and magnesium ions in the wastewater, stir for 10-40 minutes and then filter, add hydrochloric acid to the obtained filtrate to adjust the pH=6~8, then it is the pretreatment wastewater Ⅰ;

[0020] Step 2. Add magnetized biochar to the pretreated wastewater I obtained in Step 1 at a rotational speed of 100 to 300 r / min. After stirring for 15 hours, magnetic separation is performed, and the obtained filtrate is pretreated wastewater II;

[0021] Step 3. Conduct ...

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Abstract

The invention specifically relates to a method for recycling high-quality industrial salt from desulfurization wastewater of a coal-fired power plant. The method comprises the following steps: performing chemical precipitation, flocculation and softening pretreatment of the desulfurization wastewater of a coal-fired power plant; adding magnetic biochar and performing advanced removal of heavy metals; and performing semi-continuous evaporative crystallization, wherein the water quality of the recycled condensate water can reach the water supply standard of Water Quality for Industrial Boilers of GB / 1576-2008, and the quality of recycled industrial salt product reaches the secondary standard of national refined industrial salt of GB / T 5462-2003. The method provided by the invention has the advantage of high quality of recycled industrial salt product and realizes resource utilization in the treatment process of desulfurization wastewater of the coal-fired power plant.

Description

technical field [0001] The invention belongs to the technical field of "three wastes" resource disposal, and specifically relates to a method for recovering high-quality industrial salt from desulfurization wastewater of coal-fired power plants. Background technique [0002] Coal-fired power plants are the main force of my country's electric power industry, but they are also large dischargers of industrial water and industrial wastewater, and their water consumption accounts for about 40% of industrial water. As of 2009, the total installed capacity of electric power in my country reached 8.76×10 8 kW, of which thermal power installed capacity accounts for 75.3%, and a 2×60 MW power plant consumes about 67032 m of water per day 3 , about 120~200 m 3 / h of industrial wastewater. With the severe shortage of water resources and the aggravation of environmental pollution, wastewater treatment and recycling has become an important scientific and technical problem to be solved ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F9/12C02F101/20
CPCC02F1/001C02F1/04C02F1/488C02F1/5245C02F1/56C02F1/66C02F5/02C02F9/00C02F2101/20
Inventor 王海蓉王鑫张春桃
Owner 武汉科技大学资产经营有限公司
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