Method for producing industrial grade superior ammonium sulfate through coked coarse ammonium sulfate

A crude ammonium sulfate, industrial-grade technology, applied in the field of high-quality ammonium sulfate, can solve the problems of difficult sales, poor color and low product price, and achieve the effects of improving color grade, slowing growth rate, and reducing impurity content.

Inactive Publication Date: 2014-01-08
WUHAN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The current coking ammonium sulfate can only be used as agricultural chemical fertilizer because it contains tar, tar residue and other impurities, and its color is poor. The price of the product is low and it is difficult to sell

Method used

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  • Method for producing industrial grade superior ammonium sulfate through coked coarse ammonium sulfate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] A method for coking crude ammonium sulphate to produce industrial grade superior product ammonium sulphate, the concrete steps are:

[0031] Step 1. Under the conditions of normal pressure, 40~60°C and 300~400r / min rotation speed, first prepare a coking crude ammonium sulfate aqueous solution with a concentration of 40~45wt%; then use NaOH to adjust the pH of the coking crude ammonium sulfate solution to 7~ 8; then adding activated carbon accounting for 1-3wt% of the coking crude ammonium sulfate to the coking crude ammonium sulfate aqueous solution, insulated and stirred for 0.5-1h and then insulated and filtered to obtain the coking crude ammonium sulfate crystallization mother liquor;

[0032] Step 2. Under normal pressure, 40~60°C and 300~400r / min rotating speed conditions, first add an acid regulator to the coking crude ammonium sulfate crystallization mother liquor prepared in step 1 to make the mother liquor pH=5~6; Add a crystal habit modifier and seed crystals ...

Embodiment 2

[0037] Step 1. Under the conditions of normal pressure, 60~80°C and 350~450r / min, first prepare a coking crude ammonium sulfate aqueous solution with a concentration of 43~48wt%; then use NaOH to adjust the pH of the coking crude ammonium sulfate solution to 8~ 9; Then, add activated carbon accounting for 2-4wt% of the coking crude ammonium sulfate to the coking crude ammonium sulfate aqueous solution, heat-preserve and stir for 0.5-1h and then insulate and filter to obtain the coking crude ammonium sulfate crystallization mother liquor;

[0038] Step 2. Under normal pressure, 60-80°C and a rotating speed of 350-450r / min, first add an acid regulator to the coking crude ammonium sulfate crystallization mother liquor prepared in step 1 to make the mother liquor pH=6~7; Add a crystal habit modifier and seed crystals to the mother liquor, heat and stir to grow crystals for 15-30 minutes, and obtain a suspended crystal slurry;

[0039] Step 3. Under the conditions of vacuum degree ...

Embodiment 3

[0043]Step 1. Under the conditions of normal pressure, 80~100°C and 350~500r / min, first prepare a coking crude ammonium sulfate aqueous solution with a concentration of 45~50wt%; then use NaOH to adjust the pH of the coking crude ammonium sulfate solution to 7~ 9; Then, add activated carbon accounting for 3-5wt% of the coking crude ammonium sulfate to the coking crude ammonium sulfate aqueous solution, insulate and stir for 0.5-1h and then insulate and filter to obtain the coking crude ammonium sulfate crystallization mother liquor;

[0044] Step 2. Under normal pressure, 80-100°C and 350-500r / min rotating speed conditions, first add an acid regulator to the coking crude ammonium sulfate crystallization mother liquor prepared in step 1 to make the mother liquor pH=5~7; Add a crystal habit modifier and seed crystals to the mother liquor, heat and stir to grow crystals for 15-30 minutes, and obtain a suspended crystal slurry;

[0045] Step 3. Under normal pressure, 80-100°C and ...

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Abstract

The invention particularly relates to a method for producing industrial grade superior ammonium sulfate through coked coarse ammonium sulfate. According to the technical scheme, the method comprises the steps that the pH value of a coked coarse ammonium sulfate aqueous solution is adjusted through NaOH, activated carbon is further added, and the aqueous solution is filtered, so that a coked coarse ammonium sulfate crystallization mother solution is obtained; an acidity adjusting agent, a crystal habit modification agent and seed crystals are added to the mother solution and crystals are cultivated; finally, evaporative crystallization is conducted, so that ammonium sulfate crystals are obtained. The method for producing the industrial grade superior ammonium sulfate through the coked coarse ammonium sulfate has the advantages that the quality of a coked coarse ammonium sulfate product is remarkably improved, the particle size distribution of the ammonium sulfate product which is produced with the coked coarse ammonium sulfate serving as a raw material is concentrated, the average particle size is controllable, the surface is smooth, the purity is high, the liquidity is good, and the standard of an industrial grade superior product can be met.

Description

technical field [0001] The invention belongs to the technical field of industrial crystallization, and in particular relates to a method for producing industrial-grade high-quality ammonium sulfate by coking crude ammonium sulfate. Background technique [0002] Coking ammonium sulfate is a large industrial by-product of coke oven gas purification. A JN60-60 type 2×65 hole 7m 63 coke oven with an annual output of 2 million tons of coke can reach 30,000 t / a of ammonium sulfate. Since 1993, my country's coke output has been ranked first in the world, and it exceeded 400 million tons in 2011, so the output of domestic coking ammonium sulfate is huge. Ammonium sulfate is an important nitrogen fertilizer, and it can also be used as printing and dyeing agent, food catalyst, buffering agent, leather deliming agent and so on in industry. [0003] At present, most coking plants in China use the saturator method to produce ammonium sulfate. Coking ammonium sulfate is often gray, gre...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01C1/24C01C1/248
Inventor 张春桃刘帮禹王鑫王海蓉
Owner WUHAN UNIV OF SCI & TECH
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