Method for using membrane technology for recycling mixed industrial salt waste solutions

A technology of industrial salt and membrane technology, applied in chemical instruments and methods, inorganic chemistry, alkali metal chloride, etc., can solve the problems of complex equipment, high energy consumption, high risk factor, etc., and achieve good economic and environmental benefits, equipment Simple, easy-to-operate effects

Inactive Publication Date: 2019-06-07
盛隆资源再生(无锡)有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In the whole separation process, the energy consumption is large, the equipment is complicated, the risk factor is high, and the purity of the separated product is not high; CN201310311711 uses bipolar membrane electrodialysis to separate sulfuric acid and sodium hydroxide solution from viscose fiber sodium sulfate waste liquid , but this method is only suitable for single-component waste liquid, not suitable for the separation of mixed industrial salt waste liquid
CN207108514U discloses a device that adopts membrane separation technology to realize the separation of mixed industrial salts. This device only involves the separation of 2 kinds of industrial salts, and is not suitable for 3 kinds of mixed industrial salts

Method used

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  • Method for using membrane technology for recycling mixed industrial salt waste solutions

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Effect test

Embodiment 1

[0027] Take 500mL of spray tower waste liquid from a chemical manufacturer (sulfate radical 100g / L, nitrate radical 80g / L, chloride ion 80g / L, ammonia nitrogen 80g / L), add decolorizer activated carbon 2.5g to the waste liquid, and stir for 2h , filtered to obtain solution A, the secondary waste activated carbon was regenerated through a high-temperature furnace, after adding caustic soda to adjust pH=7 in solution A, the solution obtained after blowing off by stripping tower and absorbing by spray tower passed through reverse osmosis membrane to obtain 291g 26.2% concentrated ammonia water and fresh water, the fresh water enters the water treatment system; the liquid after the stripping tower passes through the nanofiltration membrane to obtain solution C and solution D, and solution C can obtain 12.5% ​​hydrogen after passing through the modified bipolar membrane Sodium oxide solution and 13.9% sulfuric acid solution, solution D was concentrated under high temperature at 95°C ...

Embodiment 2

[0029] Take 500mL of spray tower waste liquid from a chemical manufacturer (sulfate radical 100g / L, nitrate radical 80g / L, chloride ion 80g / L, ammonia nitrogen 80g / L), add decolorizer activated carbon 4g to the waste liquid, and stir for 2.5h , filtered to obtain solution A, the secondary waste activated carbon was regenerated through a high-temperature furnace, after adding caustic soda to adjust pH=8 in solution A, the solution obtained after blowing off by stripping tower and absorbing by spray tower passed through RO membrane to obtain 284g 26.8 % concentrated ammonia water and fresh water, and fresh water enters the water treatment system; the liquid after the stripping tower passes through the nanofiltration membrane to obtain solution C and solution D, and solution C can obtain 12.9% hydrogen oxidation after passing through the modified bipolar membrane Sodium solution and 14.1% sulfuric acid solution, solution D was concentrated under high temperature at 100°C and -0.03...

Embodiment 3

[0031] Get 500mL of spray tower waste liquid of certain chemical manufacturer (sulfate radical 100g / L, nitrate radical 80g / L, chloride ion 80g / L, ammonia nitrogen 80g / L), add decolorizer active carbon 5g in waste liquid, and stir 3h, Solution A is obtained by filtration, and the secondary waste activated carbon is regenerated through a high-temperature furnace. After adding caustic soda to the solution A to adjust the pH=9, the solution obtained after blowing off the stripping tower and absorbing the spray tower passes through the reverse osmosis membrane to obtain 281g 27.1 % concentrated ammonia water and fresh water, fresh water enters the water treatment system; the liquid after the stripping tower passes through the nanofiltration membrane to obtain solution C and solution D, and solution C can obtain 12.6% hydrogen oxidation after passing through the modified bipolar membrane Sodium solution and 14.2% sulfuric acid solution, solution D was concentrated under high temperat...

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Abstract

The invention discloses a method for using a membrane technology for recycling mixed industrial salt waste solutions. The method comprises the following steps of (1) adding a decolorising agent into the mixed industrial salt waste solutions, stirring a mixture for 2-3 h, and filtering the mixture to obtain a solution A; (2) using alkali for adjusting a pH of the solution A to be 7-9, and producinggas A and a solution B from the solution through an air stripping tower; (3) making the gas A run through a spray tower and then run through membrane 1 for concentration to produce stronger ammonia water; (4) producing a solution C and a solution D from the solution B through membrane 2; (5) producing a sulfuric acid solution and a sodium hydroxide solution from the solution C through action of membrane 3; (6) producing sodium chloride crystals and a solution E after conducting concentration and centrifugation on the solution D; and (7) obtaining sodium nitrate crystals after cooling the solution E, and recycling backwater. According to the method for using the membrane technology for recycling the mixed industrial salt waste solutions, the technology is clean and environmentally friendly, required equipment is simple, operation is easy, energy consumption is low, and the various chemical products can be obtained from the three kinds of mixed salt solutions at the same time, so that economic benefits and environmental benefits are well combined.

Description

technical field [0001] The invention relates to the technical field of recovery and treatment of high-salt wastewater, in particular to a method for recycling mixed industrial salt waste liquid resources. Background technique [0002] Mixed industrial salt mainly comes from the by-products produced in the chemical production process, such as waste liquid after neutralization of waste acid and waste alkali, waste liquid after spray tower water absorbs acidic and alkaline gases, etc. Among them, sodium sulfate, sodium chloride and sodium nitrate are common industrial salts. At present, the method of treating waste liquid containing these three kinds of salts is generally to evaporate and concentrate this waste liquid, and mix the salts for landfill, which not only causes soil and water pollution, and wasted a lot of salt resources. [0003] CN201610361741 mentioned a method for preparing sodium sulfate and sodium chloride from desulfurization wastewater, which mainly uses con...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/06C01B17/90C01C1/02C01D1/28C01D3/04C01D3/14C01D9/16C02F101/10C02F101/12C02F101/16
Inventor 钊现花陈琪朗超方稳王厚坤
Owner 盛隆资源再生(无锡)有限公司
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