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A method and device for preparing nacl industrial salt with zero discharge of desulfurization wastewater

A desulfurization wastewater, zero-discharge technology, applied in chemical instruments and methods, water/sewage multi-stage treatment, water/sludge/sewage treatment, etc. problem, to achieve the effect of avoiding internal scaling, avoiding scaling, reducing the content

Active Publication Date: 2017-06-20
BEIJING GUODIAN FUTONG SCI & TECH DEV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The technical problem to be solved by the present invention is that in the prior art, evaporative crystallization is used to treat flue gas desulfurization wastewater, and scaling easily occurs on the inner surface of the wastewater treatment device, and the resulting solid miscellaneous salt has complex components and cannot be recycled. It can be treated as hazardous waste, thus proposing a method and device for preparing NaCl industrial salt with zero discharge of desulfurization wastewater

Method used

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  • A method and device for preparing nacl industrial salt with zero discharge of desulfurization wastewater

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Embodiment 1

[0038] The invention provides a method for preparing NaCl industrial salt with zero discharge of desulfurization wastewater, the process flow chart of which is as follows figure 1 As shown, the specific steps are as follows:

[0039] (1) Add flocculant polyferric chloride and coagulant polyacrylamide to the desulfurization wastewater in the coagulation clarifier 1, so that the suspended solids and colloids in the desulfurization wastewater are condensed into large particles and precipitated; the desulfurization Wastewater treatment volume is 15m 3 / h, the dosage of the flocculant is 50mg / liter of desulfurization wastewater, and the dosage of the coagulant aid is 0.5mg / liter of desulfurization wastewater;

[0040] (2) Pass the waste water that step (1) removes suspended solids and colloids into the evaporator water inlet tank 2, and add antiscalant; Then it is evaporated in the evaporator 3, for the waste water in the initial stage of evaporation For detection, the wastewater...

Embodiment 2

[0045] The invention provides a method for preparing NaCl industrial salt with zero discharge of desulfurization wastewater, the specific steps are as follows:

[0046] (1) Add flocculant iron trichloride and coagulant polyacrylamide in the desulfurization wastewater in the coagulation clarifier, so that the suspended solids and colloids in the desulfurization wastewater are condensed into large particles and precipitated; the desulfurization wastewater The processing capacity is 30m 3 / h, the dosage of the flocculant is 80mg / liter of desulfurization wastewater, and the dosage of the coagulant aid is 1mg / liter of desulfurization wastewater;

[0047] (2) Evaporate the wastewater from step (1) to remove suspended solids and colloids in the evaporator, and detect the wastewater in the initial stage of evaporation, and the wastewater contains SO 4 2- and Ca 2+ The molar ratio is greater than 1, adding CaCl to the wastewater 2 crystal seeds to separate out the easily scaling su...

Embodiment 3

[0052] The invention provides a method for preparing NaCl industrial salt with zero discharge of desulfurization wastewater, the process flow is as follows figure 1 As shown, the specific steps are as follows:

[0053] (1) Add flocculant ferric chloride, coagulant polyacrylamide and appropriate amount of heavy metal removal agent sodium sulfide to the desulfurization wastewater in the coagulation clarification tank to achieve the removal of heavy metals while also suspending the desulfurization wastewater Matters and colloids condense into large particles and settle down; the treatment capacity of the desulfurization wastewater is 20m 3 / h, the dosage of the flocculant is 70mg / liter of desulfurization wastewater, and the dosage of the coagulant aid is 0.8mg / liter of desulfurization wastewater;

[0054] (2) Evaporate the wastewater from step (1) to remove suspended solids and colloids in the evaporator, and detect the wastewater in the initial stage of evaporation, and the was...

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Abstract

The invention provides a method for preparing NaCl industrial salt with desulphurization waste water zero discharge. First, suspensions and colloids in desulphurization waste water are aggregated into large particles and precipitate, then the waste water without suspensions and colloids is evaporated, during the initial period of evaporation, seed crystals are added into the waste water, thus substances easy to scale are precipitated, the precipitated substances easy to scale are discharged, the residual solution system is subjected to condensation, crystallization, dehydration and drying, and NaCl industrial salt with a high purity is obtained. Through a mode of addition of seed crystals, the substances easy to scale in the waste water are precipitated with the seed crystals as crystal nucleuses firstly, then the precipitated substances easy to scale are discharged, the impurity ion content in the waste water system is lowered, the waste water hardness is lowered effectively, scaling on inner surfaces of a waste water processing device can be avoided effectively, and finally production of NaCl industrial salt products with a high purity can be achieved.

Description

technical field [0001] The invention relates to a method and a device for preparing NaCl industrial salt with zero discharge of desulfurization wastewater, belonging to the technical field of desulfurization wastewater treatment. Background technique [0002] Wet flue gas desulfurization is a mature and efficient desulfurization process for sulfur air pollution treatment, widely used in various flue gas desulfurization devices; however, wet desulfurization will produce desulfurization wastewater, which contains a large amount of suspended solids, calcium and magnesium Hardness, active silicon, heavy metals, COD, high salt content and other special substances; at present, desulfurization wastewater is basically discharged after simple treatment, which not only wastes water resources, but also has a great impact on the environment; therefore, the depth Treatment and further reuse of desulfurization wastewater until zero discharge of wastewater is a trend in the treatment of de...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F9/10C01D3/06C01D3/14
Inventor 樊兆世冯金海施明清丁绍峰胡溪
Owner BEIJING GUODIAN FUTONG SCI & TECH DEV
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