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Comprehensive recycling method of cobalt smelting high-magnesium ammonium sulfate wastewater

A high-magnesium ammonium sulfate and ammonium sulfate technology, which is applied in metallurgical wastewater treatment, cobalt compounds, ammonium sulfate, etc., can solve the problems of pollution, algae and other microorganisms in water, and achieve the effect of solving environmental pollution problems

Active Publication Date: 2016-07-06
赣州逸豪优美科实业有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] In order to overcome the disadvantages of high-concentration ammonia nitrogen and high-concentration magnesium ions in cobalt smelting high-magnesium ammonium sulfate wastewater, once discharged into the water body, it is easy to cause a large number of algae and other microorganisms in the water to multiply, resulting in eutrophication of the water body and causing pollution. The technical problem to be solved by the invention is to provide a comprehensive recycling method for high-magnesium ammonium sulfate waste water from cobalt smelting, using sodium sulfide to precipitate cobalt and nickel, MAP precipitation to remove magnesium and four-effect continuous evaporation and concentration to recover crystalline ammonium sulfate. The method not only solves the problem of high-magnesium ammonium sulfate wastewater treatment, but also recovers by-products such as cobalt nickel, magnesium ammonium ammonium phosphate hexahydrate and ammonium sulfate products in the wastewater

Method used

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  • Comprehensive recycling method of cobalt smelting high-magnesium ammonium sulfate wastewater
  • Comprehensive recycling method of cobalt smelting high-magnesium ammonium sulfate wastewater
  • Comprehensive recycling method of cobalt smelting high-magnesium ammonium sulfate wastewater

Examples

Experimental program
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Effect test

Embodiment 1

[0021] Cobalt smelting high magnesium ammonium sulfate wastewater 400m 3 Selected from a metal smelting company in Gannan, where NH 4 + The content is 20g / l, the Co content is 0.03g / l, the Ni content is 0.5g / l, the Mg content is 4g / l, and the pH value is 5.

[0022] (1) After the above-mentioned high-magnesium ammonium sulfate wastewater is removed from the organic phase by an oil-water separator, a mixed solution A is obtained, and 220 kg of sodium sulfide is added to the mixed solution A, and 300 kg of a mixture of cobalt sulfide and nickel sulfide and filtrate A and filtrate A are obtained by filtration. into the cistern;

[0023] (2) the pH value of entering the water storage tank filtrate A in the step (1) is adjusted to 8 with ammoniacal liquor, then add diammonium hydrogen phosphate 1700kg, carry out solid-liquid separation, obtain solid 11000kg of magnesium ammonium phosphate hexahydrate and filtrate B;

[0024] (3) Use sulfuric acid to adjust the pH of step (2) fil...

Embodiment 2

[0029] Cobalt smelting high magnesium ammonium sulfate wastewater 400m 3 Selected from a metal smelting company in Gannan, where NH 4 + The content is 28g / l, the Co content is 0.07g / l, the Ni content is 0.7g / l, the Mg content is 8g / l, and the pH value is 6.

[0030] (1) After the above-mentioned high-magnesium ammonium sulfate wastewater is removed from the organic phase by an oil-water separator, a mixed solution A is obtained, and 310 kg of sodium sulfide is added to the mixed solution A, and 420 kg of cobalt sulfide and nickel sulfide mixture and filtrate A and filtrate A are obtained by filtration. into the cistern;

[0031] (2) the pH value entering the water storage tank filtrate A in step (1) is adjusted to 10 with ammoniacal liquor, then add diammonium hydrogen phosphate 3200kg, carry out solid-liquid separation, obtain solid 20000kg of ammonium ammonium phosphate hexahydrate and filtrate B;

[0032] (3) Adjust the pH of step (2) filtrate B to 6.8 with sulfuric acid...

Embodiment 3

[0037] Cobalt smelting high magnesium ammonium sulfate wastewater 400m 3 Selected from a metal smelting company in Gannan, where NH 4 + The content is 26g / l, the Co content is 0.05g / l, the Ni content is 0.6g / l, the Mg content is 5g / l, and the pH value is 5.5.

[0038] (1) After the above-mentioned high-magnesium ammonium sulfate wastewater is pre-removed by an oil-water separator to obtain a mixed solution A, 260 kg of sodium sulfide is added to the mixed solution A, and 360 kg of a mixture of cobalt sulfide and nickel sulfide and filtrate A and filtrate A are obtained by filtration. into the cistern;

[0039] (2) the pH value entering the water storage tank filtrate A in the step (1) is adjusted to 9 with ammoniacal liquor, then add diammonium hydrogen phosphate 2000kg, carry out solid-liquid separation, get magnesium ammonium ammonium phosphate hexahydrate solid 15000kg and filtrate B;

[0040] (3) Use sulfuric acid to adjust the pH of step (2) filtrate B to 6.5, then ent...

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Abstract

The invention relates to the field of wastewater comprehensive recycling, in particular to a comprehensive recycling method of cobalt smelting high-magnesium ammonium sulfate wastewater and aims to overcome the defect that once high-concentration ammonia nitrogen and high-concentration magnesium ions in the cobalt smelting high-magnesium ammonium sulfate wastewater are discharged into a water body, it is easy for algae and other microorganisms in the water to massively breed, the water body experiences eutrophication and pollution is caused. The technical problem to be solved is to provide a comprehensive recycling method of cobalt smelting high-magnesium ammonia sulfate wastewater; by the combination of cobalt and nickel precipitation by sodium sulfide, magnesium removal by MAP precipitation and crystallized ammonium sulfate recycling by four-effect continuous evaporative concentration, the problem that high-magnesium ammonium sulfate is difficult to treat is solved, cobalt and nickel and byproducts such as magnesium ammonia phosphate hexahydrate and ammonium sulfate products in the wastewater are recycled; the ammonia nitrogen concentration in the wastewater is reduced, and environmental impact is reduced.

Description

technical field [0001] The invention relates to a comprehensive utilization of resources, in particular to a method for comprehensive recovery and utilization of cobalt smelting high-magnesium ammonium sulfate wastewater. Background technique [0002] Ammonia nitrogen wastewater is the main wastewater produced in the cobalt smelting process, among which ammonium sulfate wastewater is one of the main ammonia nitrogen wastewater. In addition to high concentration of ammonia nitrogen, this kind of wastewater also contains high concentration of magnesium ions. Once discharged into the water body, especially the slow-moving lakes and bays, it is easy to cause a large number of algae and other microorganisms in the water to multiply, which is the cause of eutrophication in the water body. one of the main reasons for it. Therefore, it is necessary to effectively treat high-concentration ammonia-nitrogen before discharge. Magnesium-containing ammonium sulfate wastewater from a cob...

Claims

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Application Information

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IPC IPC(8): C02F9/10C01B25/45C01C1/24C01G51/00C01G53/11
CPCC01B25/451C01C1/24C01G51/30C01G53/11C02F1/001C02F1/048C02F1/08C02F1/40C02F1/58C02F1/62C02F9/00C02F2101/16C02F2103/16C02F2301/08
Inventor 熊以俊刘东辉张剑萌
Owner 赣州逸豪优美科实业有限公司
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