CN102285824A

CN102285824A - Process for preparing compound fertilizer by utilizing iminodiacetonitrile waste liquid

Info

Publication number: CN102285824A
Application number: CN2010102042852A
Authority: CN
Inventors: 张新
Original assignee: Individual
Current assignee: Individual
Priority date: 2010-06-21
Filing date: 2010-06-21
Publication date: 2011-12-21

Abstract

The invention discloses a process for preparing a compound fertilizer by utilizing iminodiacetonitrile waste liquid. The raw material comprises the following components of: ammonium sulfate, potassium sulfate, monoammonium phosphate, calcium hydrophosphate, calcium hydroxide and magnesium sulfate. The preparation method comprises the following steps of: pumping the iminodiacetonitrile waste liquid into an ingredient pool, and adding the calcium hydrophosphate to react; sequentially adding the ammonium sulfate, the potassium sulfate, the monoammonium phosphate, the calcium hydrophosphate and the magnesium sulfate, completely dissolving and stirring, granulating, drying, and feeding back unqualified grains to be re-granulated; and adding a waste water and water gas reutilization process to the process disclosed by the invention. The iminodiacetonitrile waste liquid is taken as the raw material in the process disclosed by the invention, thus the purposes of turning harm into good and protecting environment are realized. Secondary pollution is not generated, no three wastes exhaust and the yield is stable during the whole production.

Description

Utilize the technology of iminodiacetonitrile waste liquid production composite fertilizer

Technical field

The present invention relates to a kind of production technique of composite fertilizer.

Background technology

Have also in China's chemical fertilizers production that nitrogen is many, phosphorus is few, the phenomenon of potassium deficiency.China's fertilizer amount is big, rank first in the world, but its utilization rate of fertilizer is low, in applying the fertilizer in soil, the loss of chemical fertilizer of 40%-60% is arranged approximately, not only causes the huge wasting of resources, and causes ecological environment of soil to worsen.According to statistics, at present China has more than 2,000 ten thousand hectares of arable lands to be polluted, and causes grain about 5,000,000,000 kilograms of the underproduction on year-on-year basis.In China, per kilogram fertilizer increases food crop output not as good as 1/2nd of world standard.Simultaneously, owing to use mineral manure in a large number for a long time, soil with organic matter reduces year by year, thereby destroys the ecotope of soil, causes arable soil to harden, crop production reduction, and quality reduces.For this reason, China agricultural sector has proposed to develop compound organic and inorganic fertilizer, to improve this phenomenon.

According to above-mentioned situation, for adapting to the needs of modern agricultural development, the development of chemical fertilizer must be from ecological agriculture technological standpoint, develop and to make increasing crop yield, make increasing peasant income, improve crop quality, pollution-free, the non-harmful fertilizer variety that can improve the soil again, this is the required of developing modern agriculture, is that benefit future generations offspring's institute wants.

Compound organic and inorganic fertilizer makes crop yield, makes increasing peasant income, can improve crop quality, can improve the soil again, and test shows that effect of increasing production is better than general inorganic compound fertilizer greatly through agricultural section.

Again and, iminodiacetonitrile nitrile waste liquid is the project of the disposal of three wastes, its complicated component; iminodiacetonitrile nitrile waste liquid is the raffinate of production iminodiacetonitrile nitrile; be the dark red thickness aqueous solution, proportion is 1.18-1.25, and directly discharging will cause severe contamination; processing costs is very high; if can adopt special process technology to be recycled with this liquid as nitrogen and organic raw material, then can reach and turn harm into good; turn waste into wealth the purpose of protection environment.

Summary of the invention

In order to overcome the above problem, the invention provides a kind of iminodiacetonitrile waste liquid that utilizes and produce compound fertilizer production technology.

Present technique comprises the usage ratio and the complete processing of its raw material, and the usage ratio of its raw material is: wherein, per 1 cube volume imino-waste liquid diethyl is equipped with following raw material, and its raw material weight ratio is:

Ammonium sulfate: 40%～50%

Vitriolate of tartar: 10%～20%

Monoammonium phosphate: 10%～16%

Secondary calcium phosphate: 60%～70%

Calcium hydroxide: 0.2%～0.4%

Sal epsom: 0.2%～0.4%

Its production technique is:

A. the iminodiacetonitrile waste liquid is pumped into dosing chamber, and add secondary calcium phosphate, reacted 20～40 minutes;

B. add ammonium sulfate, vitriolate of tartar, monoammonium phosphate, secondary calcium phosphate, sal epsom then successively, and through fully dissolving and stirring 30～60 minutes;

C. mixture after being mixed is pumped into the whitewashing pond; Proportion reaches 1.32-1.34

D. when the hot blast that provides in the granulating and drying machine reaches more than 360 ℃, temperature of charge reaches 70 ℃ in the dryer, and the mixture in the whitewashing pond is sprayed into granulating and drying machine, and in granulating and drying machine granulating and carry out warm air drying; Not granulated fine powder or granule are sifted out, and send and return the whitewashing pond;

The grain that e. will be shaped continues dry, and making its water content is 0～5%;

F. after drying, grain is transported to sieve apparatus, sieves out the spherolite that diameter is 2-4.2mm, undesirable grain and fine powder are carried out break process and return granulating and drying machine granulation again;

J. the particle after will screening enters cooler and cools off;

H. after the cooling, the packing warehouse-in is finished the production of composite fertilizer;

I. will collect by the hot blast of granulating and drying machine, and carry out dedusting, and enter washing machine after the dedusting again and carry out scrubbing dust collection, after dust content wherein is less than GB, discharge;

G. the washings that hot blast is washed is through recycling, and when wherein concentration reaches proportion after 1: 16, returns to dosing chamber and utilizes;

The present invention utilizes the iminodiacetonitrile waste liquid as starting material; the iminodiacetonitrile waste liquid is the project of the disposal of three wastes; iminodiacetonitrile component of effluent complexity; directly discharging will cause severe contamination, and processing costs is very high, and this technology is with the raw material of this liquid as nitrogen and organic matter; recycled; reach and turn harm into good, turn waste into wealth, the purpose of protection environment.

This device produces tail gas and contains low amounts of dust, adopts tornado dust collector to remove wherein about 80%, is recovered in the granulating system, and all the other dust of about 20% make tail gas reach emission standard after chimney enters in the atmosphere after the washer washing.

Washing water recycle, reach finite concentration after, add dosing chamber and recycle.There is not other discharge of wastewater.

Do not produce secondary pollution in the whole process of production, three-waste free discharge, and stable yield, outward appearance is even, smooth, glossy.

Embodiment

Be example by the iminodiacetonitrile waste liquid that utilizes 1 cube volume, produce in the following manner:

A. 1 cube volume iminodiacetonitrile waste liquid is pumped into dosing chamber, and add 20～30kg calcium hydroxide, reacted 20～40 minutes;

B. the secondary calcium phosphate, the 20～30kg sal epsom that add 320～380kg ammonium sulfate, 100～150kg vitriolate of tartar, 80～120kg monoammonium phosphate, 100～150kg fertilizer grade then successively, and through fully dissolving and stirring 30～60 minutes;

C. mixture after being mixed is pumped into the whitewashing pond;

D. when the hot blast that provides in the granulating and drying machine reaches 70 ℃, the mixture in the whitewashing pond is sprayed into granulating and drying machine, and in granulating and drying machine granulating and carry out warm air drying; Not granulated fine powder or granule are sifted out, and send and return the whitewashing pond;

J. the particle after will screening enters cooler and cools off;

G. the washings that hot blast is washed is through recycling, and after wherein concentration reaches (1: 16), returns to dosing chamber and utilizes.

Foregoing is invented the description that tries example to this patent, and obviously, patent of the present invention is not limited thereto, and on this basis to the various remodeling that the present invention did, does not all exceed the present invention.

Claims

1. utilize the technology of iminodiacetonitrile waste liquid production composite fertilizer, it is characterized in that, wherein, per 1 cube volume imino-waste liquid diethyl is equipped with following raw material, and its raw material weight ratio is:

Ammonium sulfate: 40%～50%

Vitriolate of tartar: 10%～20%

Monoammonium phosphate: 10%～16%

Secondary calcium phosphate: 60%～70%

Calcium hydroxide: 0.2%～0.4%

Sal epsom: 0.2%～0.4%

Its production technique is:

A. the iminodiacetonitrile waste liquid is pumped into dosing chamber, and add calcium hydroxide, reacted 20～40 minutes;

C. mixture after being mixed is pumped into the whitewashing pond;

D. when the hot blast that provides in the granulating and drying machine reaches 360 ℃, the mixture in the whitewashing pond is sprayed into granulating and drying machine, and in granulating and drying machine granulating and carry out warm air drying; Not granulated fine powder or granule are sifted out, and send and return the whitewashing pond;

J. the particle after will screening enters cooler and cools off;

G.. the washings that hot blast is washed is through recycling, and when wherein concentration reaches proportion after 1: 16, returns to dosing chamber and utilizes.