System and method for grading purification of potassium salt and sodium salt in fly ash water washing solution

A water washing, potassium and sodium technology, applied in chemical instruments and methods, water/sewage multi-stage treatment, heating water/sewage treatment, etc., can solve the problems affecting the continuous operation of the MVR system, the difficulty in establishing a balance between the old and the new system, and the low purity of potassium chloride. and other problems, to achieve the effect of promoting continuous and stable operation, reducing the cost of fly ash disposal, and realizing recycling.

Pending Publication Date: 2019-09-13
BEIJING JINYU MANGROVE ENVIRONMENTAL PROTECTION TECH +3
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  • Abstract
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  • Application Information

AI Technical Summary

Problems solved by technology

At present, the MVR system is used for evaporative desalination of the fly ash washing liquid. During the operation of the MVR system, it is easy to cause wall formation, scarring and blockage due to the continuous enrichment of potassium chloride, which leads to shutdown and mother liquor emptying operations, which affects the MVR system. continuous operation of
[0004] In order to ensure the continuous operation of the MVR system and realize the classified recovery of potassium chloride and sodium chloride resources in the fly ash washing liquid, CN206793091U discloses a potassium and sodium salt separation system combined with the MVR system, mother liquor, insulation filtration, coo

Method used

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  • System and method for grading purification of potassium salt and sodium salt in fly ash water washing solution

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Example Embodiment

[0031] Example 1

[0032] like figure 1 As shown, a kind of fly ash water washing liquid potassium and sodium salt quality purification system, including thickener, cooling kettle, decanter centrifuge, potash mother liquor tank, potash mother liquor heat exchanger, MVR evaporation system connected successively, the described The cooling kettle is also connected with a vacuuming system and an MVR water supply tank, the decanter centrifuge is also connected with a fine salt tank, and the fine salt tank is connected with a sodium salt centrifuge.

[0033] The vacuum pumping system includes a first gas-liquid separator, a steam condenser, a second gas-liquid separator and a double-ring vacuum pump which are connected in sequence, and the first gas-liquid separator is connected with the cooling kettle.

[0034] The described vacuuming system ensures that the cooling kettle is cooled under the condition of vacuum, and potassium chloride crystals are obtained through the separation ...

Example Embodiment

[0043] Example 2

[0044] The present embodiment utilizes the described system to purify the method for potassium and sodium in the fly ash water washing liquid, comprising the following steps:

[0045] First, pump the supernatant in the thickener into the cooling kettle, and then pump the unsaturated brine in the MVR water supply tank into the cooling kettle to wash and salt the supernatant in the thickener, through vacuum flash evaporation and The combined cooling method of circulating cooling water realizes rapid cooling and crystallization of materials to separate out potassium chloride crystals, then all enter the decanter centrifuge for separation to obtain potassium chloride crystals and potassium chloride mother liquor, and the potassium chloride mother liquor enters the potassium salt The mother liquor tank is then heated to 100°C through the potassium salt mother liquor heat exchanger and returned to the MVR evaporation system. At the same time, when the fine salt e...

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Abstract

The invention relates to a system and a method for grading purification of a potassium salt and a sodium salt in a fly ash water washing solution. The system comprises a thickener, a cooling kettle, ahorizontal screw centrifuge, a potassium salt mother liquor tank, a potassium salt mother liquor heat exchanger and an MVR evaporation system which are sequentially connected, the cooling kettle is further connected with a vacuum pumping system and an MVR water supply tank, the horizontal screw centrifuge is also connected with a fine salt tank, and the fine salt tank is connected with a sodium salt centrifuge. The system of the invention can realize the effective separation of sodium chloride and potassium chloride in the fly ash water washing solution to obtain a high-purity potassium chloride product and make the purity of potassium chloride reach 92%, and also can reduce the treatment cost of fly ash, alleviate the fine salt enrichment degree of the MVR system, promote the continuousand stable running of the MVR system and prolong the period of scaling and salt attachment of a crystallization separator, caused by the fine salts in the MVR system.

Description

technical field [0001] The invention belongs to the technical field of hazardous waste treatment, and in particular relates to a system and method for separating and purifying potassium and sodium salts of fly ash washing liquid. Background technique [0002] MVR is the abbreviation of mechanical vapor recompression technology. It uses the secondary steam and its energy generated by the evaporation system itself to work through the compression of the steam compressor to increase the thermal energy of the secondary steam. This cycle supplies heat to the evaporation system, thereby reducing the impact on An energy-saving technology that meets the demand for external energy, and is currently widely used in the fields of chemical industry, food, papermaking, medicine, seawater desalination and sewage treatment. [0003] Garbage fly ash refers to the residue collected in the flue gas purification system of waste incineration power plants, which contains soluble substances such as...

Claims

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Application Information

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IPC IPC(8): C02F9/10C01D3/14
CPCC02F1/38C02F1/06C01D3/14
Inventor 练礼财吴存根顾军张国亮位百勇朱延臣黄岚李铁良方伟王春华阴琴
Owner BEIJING JINYU MANGROVE ENVIRONMENTAL PROTECTION TECH
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