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Potassium sulfate extracted from sintering dust separation ash and method for producing the same

A technology of potassium sulfate and ammonium sulfate, which is applied in the field of extracting potassium sulfate and its preparation, can solve the problems of water consumption and large amount of leached water, and achieve the effects of reducing energy consumption, improving purity, and reducing production costs

Inactive Publication Date: 2010-12-22
SHANDONG IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In this invention, chloride is easy to cause soil compaction, and the amount of leaching water added is large, consuming a lot of water resources

Method used

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  • Potassium sulfate extracted from sintering dust separation ash and method for producing the same
  • Potassium sulfate extracted from sintering dust separation ash and method for producing the same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] 100 grams of dust, add 1000mL deionized water to soak for 3 days, filter, concentrate the filtrate to 100mL, analyze the K in the concentrated solution + The content is 9.34 grams / 100mL. Add ammonium sulfate 15 grams (K + :SO 4 2+ =2.1:1), then add 50g formamide, react at 80°C for 2 hours, obtain crystallization of potassium sulfate, dry to obtain 18.40g of potassium sulfate, the filtrate enters the distillation tower, distill at 90°C, and recover formamide 47.5g.

Embodiment 2

[0031] Other is the same as embodiment 1, and difference is that the organic solvent that adds is different, and following table is the influence of different solvents on potassium sulfate productive rate.

[0032] Table 1 The influence of adding different solvents on the yield of potassium sulfate in 100mL concentrated solution

[0033]

[0034] As can be seen from the above experimental results, adding formamide can significantly increase the yield of potassium sulfate. When the amount of formamide is 30-35%, the yield of potassium sulfate can be close to 90%.

Embodiment 3

[0036] 150 grams of dust, add 1500mL deionized water to soak for 3 days, filter, concentrate the filtrate to 150mL, analyze the K in the concentrated solution + The content is 10.5 g / 100mL. Add ammonium sulfate 16.86 grams (K + :SO 4 2+ =2.1:1), then add 50g formamide, and react for 2 hours at 80°C to obtain crystallization of potassium sulfate, dry to obtain 20.69g of potassium sulfate, and the filtrate can be seen from the retrieval results, the patent CN101234766 also utilizes the sintering process of the iron and steel plant Electrostatic precipitator ash adopts the conventional method of producing potassium chloride, which is more conducive to the utilization of potassium in sintering dust removal ash than the production of potassium sulfate. Potassium sulfate will not cause soil compaction in the production of compound fertilizers; the use of formamide than patented CN101234766 adopts SDD to more effectively improve the yield of potassium salt; after adding formamide,...

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Abstract

The invention relates to a potassium sulfate abstracted from sintered dust removing ash and a preparation method thereof, and belongs to the technical field of a chemical product. The preparation method comprises the following steps: weighing the dust removing ash, adding the dust removing ash in water with the weight being three times than that of the dust removing ash; dipping the dust removingash for three days at the normal temperature; filtering the dust removing ash; concentrating filtrate to one tenth by adopting the reduced pressure distillation method; analyzing the content of K<+> in concentrated solution; adding ammonium sulfate in the concentrated solution, so that the K<+>: SO4<2+> is equal to 2.1:1 in the solution; adding formamide again; reacting for two hours at the temperature of 80 DEG C; and then obtaining potassium sulfate crystal. After the potassium sulfate crystal is filtered and dried, the potassium sulfate product can be obtained; the filtrate is distilled atthe temperature of 90 DEG C; an organic solvent added is recovered; and distillation residue is returned to a potassium sulphate composite reaction system to be recycled. By utilizing the metallurgical sintered dust removing ash, the invention has the advantages of simple process, low energy consumption, high return rate of kali salt, not only improves the availability of high resources and protects the environment, but also has better economic benefit and is a green and environment-friendly recycling economy project.

Description

technical field [0001] The invention belongs to the field of chemical product manufacturing, and in particular relates to extracting potassium sulfate from sintering dust and a preparation method thereof. Background technique [0002] The iron and steel industry is an important basic industry of my country's national economy, and it is also one of the industrial sectors with serious energy consumption and environmental pollution. Environmental pollution is one of the important factors restricting steel production. How to further reduce the occurrence and discharge of pollutants, control and eliminate the impact of various pollution factors on the environment is an important issue to fundamentally change the image of the traditional iron and steel industry, and to coordinate with the environment and achieve sustainable development. [0003] Sintering production is an important part of raw material preparation in iron and steel enterprises. The significance of sintering prod...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01D5/08
Inventor 李志峰郭怀功刘智伟江丹董晓春种振宇孙业新管山吉段明波林七女陈力军庞晓梅李强
Owner SHANDONG IRON & STEEL CO LTD
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