Technology for continuously producing nitrocompound fertilizer by using low-grade phosphorus ore and dolomite

A dolomite, low-grade technology, applied in application, fertilizer form, fertilization device, etc., to achieve the effects of strong operability, reduced environmental pollution, and high calcium and magnesium content

Active Publication Date: 2012-10-17
SICHUAN GOLDEN ELEPHANT SINCERITY CHEM CO LTD
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  • Summary
  • Abstract
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Domestic enterprises that use phosphate rock to produce ammonium nitrophosphate have a lot of waste solids and waste gas, which are difficult to deal with, cause great environmental pollution, and have high requirements for the grade of phosphate rock and high production costs.
Moreover, domestic phosphate rock resources are increasingly scarce, and domestic phosphate rock resources are decreasing day by day. In particular, high-grade phosphate rock needs to be imported, and a large number of low-grade phosphate rock cannot be used by many enterprises. Compared with granulation, the uniformity of product nutrients is poor and the dissolution rate is slow

Method used

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  • Technology for continuously producing nitrocompound fertilizer by using low-grade phosphorus ore and dolomite

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Calculated according to the production of one ton of compound fertilizer batching reaction production:

[0029] Take 250Kg of phosphate rock, add no more than 35Kg of water for wetting, then add 40Kg of concentrated sulfuric acid with an appropriate fraction of 98% for reaction, and recover and treat the tail gas after the reaction. After about 2 hours, add 160Kg of dolomite, and add no more than 15Kg After about 1 hour, use a pulverizer to crush, then add an appropriate amount of ammonium phosphate, send it to the granulation tower with a bucket elevator, heat the mixture to nearly 80°C, add ammonium nitrate solution in proportion, and control the reaction temperature. At 140°C, the viscosity of the slurry is suitable at this time. It is granulated by a granulator, convects with the air, shrinks into round particles in the tower and falls, collects, cools, adds anti-caking oil and powder, and packs the finished product. In the finished product: the mass percentage of N...

Embodiment 2

[0033] Take 350Kg of phosphate rock, add no more than 45Kg of water to moisten it, then add 40Kg of concentrated sulfuric acid to react, recover and treat the tail gas, and discharge the waste gas. After about 2 hours, use a pulverizer to crush it, add an appropriate amount of ammonium phosphate, and send it to Go to the prilling tower, heat the mixture to nearly 80°C, and add ammonium nitrate solution in proportion (there are specific data here, what is the proportion here, if it is a prescribed formula, what is the national regulation?) Control the reaction temperature to At 150°C, the viscosity of the slurry is appropriate at this time. Use a granulator to granulate, form convection with the air, shrink into round particles in the tower and fall, collect and cool, add anti-caking oil and powder, and pack the finished product. The mass percent content of detected N was 20.52%, P 2 o 5 The mass percentage of Ca is 5.05%, and the mass percentage of Ca is 6.87%. At this time, ...

Embodiment 3

[0036] According to the production of one ton of compound fertilizer batching reaction production:

[0037]Take 100Kg of phosphate rock, add no more than 35Kg of water to moisten it, add 40Kg of concentrated sulfuric acid to react, and recover and treat the tail gas. After about 2 hours, add 160Kg of dolomite, add no more than 15Kg of water to moisten it, and after about 1 hour, crush it with a pulverizer, add An appropriate amount of ammonium phosphate is sent to the granulation tower with a bucket elevator, the mixture is heated to nearly 80°C, and ammonium nitrate solution is added in proportion to control the reaction temperature at 160°C. The viscosity of the slurry is suitable, and the granulator granulates to form convection with the air , shrink into round particles in the tower and fall, collect and cool, add anti-caking oil and powder, and pack the finished product. The mass percentage of N detected was 21.32%, P 2 o 5 The mass percentage composition of Ca is 9.13%...

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Abstract

The invention relates to the fertilizer production device field, and is a technology for producing high efficiency nitrocompound fertilizer with low price and easy raw material acquisition, especially relates to a technology by using low-grade phosphorus ore and abundant mineral product dolomite, and concretely relates to the technology for continuously producing nitrocompound fertilizer by using low-grade phosphorus ore and dolomite. According to the technology, phosphorus ore and dolomite extracted by using sulfur to obtain effective phosphor and water-soluble calcium magnesium, a proper amount of monoammonium phosphate is added, and is reacted with melted ammonium nitrate, and is granulated in a high tower to produce the compound fertilizer. The method employs seven steps combination of performing phosphor extraction, performing calcium magnesium extraction, pulverizing, burdening, melting, granulating and cooling. According to the invention, low-grade phosphorus ore is selected for solving the problem of difficult usage of low-grade phosphorus ore, the product contains macroelements nitrogen and phosphor required by the crops, and contains three secondary elements calcium magnesium sulfur required by the growth of the crops as well as a part of trace elements, and the high tower granulation can ensure the full reaction and uniform mixing of various substances.

Description

[0001] technical field [0002] The invention relates to the field of chemical fertilizer production equipment. It is a low-cost and easy-to-obtain raw material to produce high-efficiency nitro compound fertilizer. In particular, it uses low-grade phosphate rock and mineral-rich dolomite. Process for continuous production of nitro-compound fertilizers from high-grade phosphate rock and dolomite. [0003] Background technique [0004] At present, the compound fertilizers produced by most domestic enterprises do not contain nitrate nitrogen and the content of calcium and magnesium is not up to the standard. The compound fertilizers produced in developed countries are mainly nitro fertilizers. Farmers often add calcium and magnesium fertilizers as base fertilizers, and the compound fertilizers contain nitrate nitrogen. And calcium and magnesium elements are the development trend of soil testing formula fertilization. Domestic enterprises that use phosphate rock to produce a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C05G1/00C05G5/00
Inventor 雷林刘朝慧陈刚祝泽军郭志刚
Owner SICHUAN GOLDEN ELEPHANT SINCERITY CHEM CO LTD
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