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Process and system of recycling magnesium sulfate and ammonium sulfate mixed wastewater

A technology of mixed wastewater and treatment process, which is applied in multi-stage water treatment, water/sewage treatment, water/sludge/sewage treatment, etc., which can solve the problems of difficult and low-cost effective separation, lack of market demand for mixtures, and secondary pollution of the environment and other issues, to achieve significant technical and economic effects, easy industrial implementation, and reduce the cost of waste liquid treatment

Inactive Publication Date: 2017-06-13
취저우화여우코발트뉴머터리얼컴퍼니리미티드 +1
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the high solubility of ammonia to magnesium and the co-crystallization properties of ammonium sulfate and magnesium sulfate, this part of the mixed solution is difficult to separate effectively by crystallization at low cost, and the mixture lacks market demand.
The current typical process is to use calcium oxide to process, evaporate ammonia gas and produce a large amount of calcium sulfate, magnesium hydroxide and calcium hydroxide mixed waste residue at the same time, each ton of waste water produces 50 kg of waste residue, which is not only expensive, but also creates great pressure on the enterprise , but also cause secondary pollution of the environment

Method used

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  • Process and system of recycling magnesium sulfate and ammonium sulfate mixed wastewater
  • Process and system of recycling magnesium sulfate and ammonium sulfate mixed wastewater

Examples

Experimental program
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Effect test

Embodiment 1

[0020] A magnesium sulfate ammonium sulfate mixed wastewater resource treatment process, the steps are as follows:

[0021] 1. One-time sedimentation and separation of magnesium ions in mixed wastewater

[0022] In the first-time circulation reactor, start stirring, add 2% magnesium-containing ammonium sulfate-magnesium sulfate mixed wastewater and ammonium carbonate solution in sequence, keep the pH value of the reaction system at 9.5, control the temperature at 65°C during the reaction process, mix and stir for 40 minutes, and once Precipitation reaction; after the reaction, the material enters the primary filter press to obtain a magnesium carbonate filter cake, and the filter cake goes to step 3. The mother liquor contains ammonium sulfate and 0.1%-0.5% magnesium ions, and is transported to the secondary precipitation tank, and the tail gas enters the absorption tower Ammonia water is produced, and the produced ammonia water is added to the ammonium carbonate solution and ...

Embodiment 2

[0030] A magnesium sulfate ammonium sulfate mixed wastewater resource treatment process, the steps are as follows:

[0031] 1. One-time sedimentation and separation of magnesium ions in mixed wastewater

[0032] In the primary circulation reactor, start the stirring, add 4% magnesium-containing ammonium sulfate magnesium sulfate mixed wastewater and ammonia solution in sequence, keep the pH value of the reaction system at 10.5, control the temperature at 55°C during the reaction process, and mix and stir for 45 minutes. Precipitation reaction; after the reaction, the material enters the primary filter press for pressure filtration, and the filter cake goes to step 3. The mother liquor contains ammonium sulfate and 0.1%-0.5% magnesium ions, and is transported to the secondary precipitation tank, and the tail gas enters the absorption tower to produce ammonia water. The ammonia water taken is added to the ammonium carbonate solution and the ammonium sulfate recovery system to pa...

Embodiment 3

[0040] Such as figure 2 As shown, a magnesium sulfate ammonium sulfate mixed wastewater resource treatment system described in this embodiment includes a primary circulation reactor 1, a primary filter press 2, a secondary precipitation kettle 3, a secondary filter press 4, and a calcination system 5 , ammonium sulfate recovery system 6 and tail gas absorption system 7; the outlet of primary circulation reactor 1 is connected with the inlet of primary filter press 2, the solid outlet of primary filter press 2 is connected with the inlet of calcining system 5, and the outlet of primary filter press 2 The liquid outlet is connected to the inlet of the secondary sedimentation kettle 3, the outlet of the secondary sedimentation kettle 3 is connected to the inlet of the secondary filter press 4, the solid outlet of the secondary filter press 4 is discharged, and the liquid outlet of the secondary filter press 4 is connected to The inlet of the ammonium sulfate recovery system 6, t...

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Abstract

The invention belongs to the technical field of wastewater recycling and particularly relates to a process and system of recycling magnesium sulfate and ammonium sulfate mixed wastewater. The process of recycling magnesium sulfate and ammonium sulfate mixed wastewater avoids the characteristic that ammonium sulfate and magnesium sulfate which are mutually dissolvable and co-crystallize are difficult to separate; magnesium ions are separated by means of segmental precipitation in order to produce high-quality magnesia and ammonium sulfate products and a byproduct, trace magnesium fertilizer; the components in the wastewater are recycled at low cost, the treatment cost of wastewater is reduced greatly, and zero emission of wastewater and waste residue is achieved; the invention also designs a system to implement the process; the system is reasonable in design and easy to industrially implement.

Description

technical field [0001] The invention belongs to the technical field of waste water resource treatment, and in particular relates to a resource treatment process and system for magnesium sulfate ammonium sulfate mixed waste water. Background technique [0002] Hydrometallurgy nickel and cobalt industries widely use ammonia, magnesium hydroxide, etc. as precipitants or neutralizers. The production process will produce a large amount of mixed solutions containing ammonium sulfate and magnesium sulfate. By-product more than 100 tons of ammonium sulfate magnesium sulfate mixed solution. Due to the high solubility of ammonia to magnesium and the co-crystallization properties of ammonium sulfate and magnesium sulfate, this part of the mixed solution is difficult to be effectively separated by crystallization at low cost, and the mixture lacks market demand. The current typical process is to use calcium oxide to process, evaporate ammonia gas and produce a large amount of calcium s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/52C01F5/06C01F5/08C01C1/24C05D5/00
CPCC02F1/5236C01C1/24C01F5/06C01F5/08C01P2006/80C02F1/001C02F1/56C02F2301/08C05D5/00
Inventor 沈建中孙灿韩笑
Owner 취저우화여우코발트뉴머터리얼컴퍼니리미티드
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