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A process for recovering magnesium and manganese elements from industrial wastewater

An industrial waste water and process technology, applied in the directions of manganese halide, magnesium halide, magnesium chloride, etc., can solve the problems of high concentration of divalent magnesium ions, unable to obtain pure manganese products, and large amount of bicarbonate, and achieve high precipitation rate, Accurate results and short response times

Active Publication Date: 2019-11-12
甘肃东港药业有限公司
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Problems solved by technology

[0004] Insufficient existing technology: The existing technology is to separate magnesium from manganese ore to obtain higher-purity manganese products. The magnesium-rich solution produced in the method still contains divalent manganese ions, which belongs to manganese-containing high-salt wastewater. The treatment is difficult and there is no Fundamentally solve the problem of manganese and magnesium separation
And when containing a small amount of divalent manganese ions in the magnesium salt solution, due to the large concentration of divalent magnesium ions, adding bicarbonate will co-precipitate the divalent magnesium ions, the amount of bicarbonate is large, and the higher purity cannot be obtained. manganese products

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  • A process for recovering magnesium and manganese elements from industrial wastewater

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Embodiment 1

[0036] A process for recovering magnesium and manganese elements from industrial waste water, comprising the steps of:

[0037] Determination of elements in S1 waste water: 500 kg of process waste water from the coupling reaction carried out by the Grignard reagent was collected to measure the molar weights of magnesium chloride and manganese chloride in the waste water, wherein the molar number of magnesium chloride was 134.4 mol, and the molar number of manganese chloride was 160.5 mol;

[0038] S2 precipitated manganese chloride: add 166.92mol of magnesium hydroxide to the waste water, stir and heat up to 75-85°C in a high-pressure reactor, feed carbon dioxide gas to react, centrifuge, filter, and wash to obtain filtrate I and filter cake;

[0039] S3 acidification and salt analysis: add 192.6mol of water to the filter cake in step S2 for beating, add hydrochloric acid dropwise at 20°C, and filter to obtain filtrate II;

[0040] S4 Distillation crystallization: Distill the ...

Embodiment 2

[0050] A process for recovering magnesium and manganese elements from industrial waste water, comprising the steps of:

[0051] Determination of elements in S1 waste water: 500 kg of process waste water from the coupling reaction carried out by the Grignard reagent was collected to measure the molar weights of magnesium chloride and manganese chloride in the waste water, wherein the molar number of magnesium chloride was 135.6 mol, and the molar number of manganese chloride was 160.9 mol;

[0052] S2 precipitated manganese chloride: add 168.9mol of magnesium hydroxide to the waste water, stir in a high-pressure reactor and heat up to 75-85°C, feed carbon dioxide gas to react, centrifuge, filter, and wash with water to obtain filtrate I and filter cake;

[0053] S3 acidification and salt analysis: add 197.9 mol of water to the filter cake in step S2 for beating, add hydrochloric acid dropwise at 25°C, and filter to obtain filtrate II;

[0054] S4 Distillation crystallization: D...

Embodiment 3

[0064] A process for recovering magnesium and manganese elements from industrial waste water, comprising the steps of:

[0065] Determination of elements in S1 waste water: 500 kg of process waste water from the coupling reaction carried out by the Grignard reagent was collected to measure the molar weights of magnesium chloride and manganese chloride in the waste water, wherein the molar number of magnesium chloride was 134.2 mol, and the molar number of manganese chloride was 163.5 mol;

[0066] S2 precipitated manganese chloride: add 174.9 mol of magnesium hydroxide to the waste water, stir and heat up to 75-85°C in a high-pressure reactor, feed carbon dioxide gas to react, centrifuge, filter, and wash to obtain filtrate I and filter cake;

[0067] S3 acidification and salt analysis: add 204.4mol of water to the filter cake in step S2 for beating, add hydrochloric acid dropwise at 30°C, and filter to obtain filtrate II;

[0068] S4 Distillation crystallization: Distill the ...

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Abstract

The invention relates to a process for recovering magnesium and manganese elements in industrial waste water. The process comprises the following steps: step 1, determining elements in the waste water; step 2, precipitating manganese chloride; step 3, performing acidification for precipitating salts; step 4, performing distillation crystallization: performing reduced-pressure distillation on a filtrate obtained in the step 3, performing cooling to the temperature of 55 DEG C at the speed of 8-12 DEG C / h, performing heat preservation for 0.9-1.1h at the temperature of 55 DEG C, and continuing to perform cool to the temperature of 0-10 DEG C at the speed of 8-12 DEG C / h, so as to obtain a pulp; step 5, performing centrifugation and drying: pressing the pulp prepared in the step 4 into a centrifugation machine, performing centrifugation drying until no mother liquid is centrifuged out from a centrifugation outlet, so as to obtain a mother liquid and a wet product material, putting the wetproduct material into an oven, performing first drying at the temperature of 205-215 DEG C, taking out the dried material, performing smashing, and continuing to perform second drying at the temperature of 205-215 DEG C, so as to obtain anhydrous manganese chloride; and step 6, performing recovery. The process provided by the invention has the advantages of low costs, high purity and a high yield.

Description

technical field [0001] The invention relates to the technical field of waste water recovery, in particular to a process for recovering magnesium and manganese elements from industrial waste water. Background technique [0002] Manganese has a very important strategic position in my country's economy, mainly used as a deoxidizer and desulfurizer in the process of ironmaking and steelmaking, and used to make alloys. my country is a big manganese mining country, ranking second in the world. The concentration of manganese and ammonium ions in manganese-containing wastewater is high, and it is difficult to meet the treatment standards, which not only causes pollution to the surrounding environment, but also affects the environmental protection image of the enterprise. The existing treatment technologies for manganese-containing wastewater mainly use the iron filings reduction method and lime neutralization method to treat it, but the above-mentioned technologies do not carry out...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01G45/06C01F5/30
CPCC01F5/30C01G45/06C01P2006/80
Inventor 唐强张立王洪建
Owner 甘肃东港药业有限公司
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