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A method for purifying desulfurization by-product ammonium sulfate

A technology of ammonium sulfate and by-products, applied in the direction of ammonium sulfate and other directions, can solve the problem of ammonium sulfate purification, etc., to overcome the high content of water insolubles and metal impurity ions, obvious impurity removal effect, and overcome the problem of coloration. Effect

Inactive Publication Date: 2015-12-30
WUHAN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At present, there is no technical disclosure of ammonium sulfate purification

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  • A method for purifying desulfurization by-product ammonium sulfate
  • A method for purifying desulfurization by-product ammonium sulfate
  • A method for purifying desulfurization by-product ammonium sulfate

Examples

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Embodiment 1

[0031] A method for purifying ammonium sulfate by-product of desulfurization. The desulfurization by-product ammonium sulfate described in this embodiment is the wet ammonia desulfurization by-product ammonium sulfate of a sintering plant of a steel company, and the appearance of the desulfurization by-product ammonium sulfate is as follows figure 1 Shown is a reddish-brown crystal; the main impurity content of the desulfurization by-product ammonium sulfate: tar content > 10mg / L, TFe content 0.057-0.095wt%, Pb, Cr and As total content 0.043-0.048wt%.

[0032] The concrete steps of the technical solution adopted in this embodiment are:

[0033] Step 1. Removal of water insoluble matter

[0034] Mix the desulfurization by-product ammonium sulfate and water according to the solubility of ammonium sulfate, stir the ingredients under normal pressure and 50-60°C for 0.5-1h, and filter to obtain filtrate I.

[0035] Step 2. Tar removal

[0036] The filtrate I is pumped into the e...

Embodiment 2

[0049] A method for purifying ammonium sulfate by-product of desulfurization. The desulfurization by-product ammonium sulfate described in this example is the wet-type ammonia desulfurization by-product ammonium sulfate of a sintering plant of a steel company. The appearance of the desulfurization by-product ammonium sulfate is reddish-brown crystal; 20mg / L, the content of TFe is 0.095-0.15wt%, and the total content of Pb, Cr and As is 0.048-0.053wt%.

[0050] The concrete steps of the technical solution adopted in this embodiment are:

[0051] Step one and step two are the same as step one and step two of embodiment 1.

[0052] Step 3, removal of Fe ions

[0053] At 20-40°C, add sodium carbonate to filtrate II, the amount of sodium carbonate added per cubic meter of filtrate II is 1.5-2.0 kg, stir for 3-4 hours, and filter to obtain filtrate III.

[0054] Step 4, removal of Pb, Cr and As ions

[0055] At 20-40°C, add sodium sulfide to filtrate III, the amount of sodium su...

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Abstract

The invention relates to a method for purifying ammonium sulfate serving as a desulfuration byproduct. According to the technical scheme, the method comprises the following steps: burdening ammonium sulfate serving as the desulfuration byproduct and water according to the solubility of ammonium sulfate, stirring under the normal pressure and at the temperature of 50-60 DEG C for 0.5-1 hour to obtain filtrate I; feeding the filtrate I into an expanded graphite adsorption system, and performing circular adsorption treatment at the temperature of 20-40 DEG C till the tar content at an outlet is less than or equal to 1mg / L to obtain filtrate II; adding 1-2kg of sodium carbonate into the filtrate II per cubic meter, and stirring for 2-4 hours to obtain filtrate III; adding 0.1-0.2kg of sodium sulfide into the filtrate III per cubic meter, stirring for 10-20 minutes, and filtering to obtain filtrate IV; concentrating the filtrate IV at the temperature of 80-100 DEG C, cooling to the room temperature, performing suction filtration to obtain a crystal, and drying the obtained crystal at the temperature of 80-100 DEG C for 6-10 hours to obtain ammonium sulfate. The method has the characteristics of small using amount of precipitant and low energy consumption. The obtained ammonium sulfate is a white crystal free from visible mechanical impurities, and the technical indexes are within those of a superior product.

Description

technical field [0001] The invention belongs to the technical field of ammonium sulfate purification. Specifically, it is a method for purifying ammonium sulfate, a by-product of desulfurization. technical background [0002] Ammonium sulfate is mainly used as a nitrogen fertilizer in agriculture. The advantage is that it has relatively low hygroscopicity and is not easy to agglomerate. Compared with ammonium nitrate and ammonium carbonate, it has excellent physical properties and chemical stability; besides nitrogen, ammonium sulfate also contains sulfur. It is extremely beneficial to the growth of crops. [0003] Ammonium sulfate is widely used in industry, such as nitrogen source for yeast culture in fresh yeast production, dyeing aid for acid dyes and leather deliming agent. In addition, it is also used in beer brewing, chemical reagents and battery production. Another important function is to be used in the mining of rare earths, using ammonium sulfate as a raw mater...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01C1/24
Inventor 吴晓琴王淑娟叶小莉王绍静刘成
Owner WUHAN UNIV OF SCI & TECH
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