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Steel slag compound fertilizer and preparation method thereof

A technology of compound fertilizer and steel slag, which is applied in the direction of phosphate fertilizer, fertilization device, fertilizer mixture, etc., to achieve the effect of simple process, long release period of fertilizer effect, and reduction of land occupation and environmental pollution

Inactive Publication Date: 2019-12-03
ANHUI UNIVERSITY OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Compared with the existing public documents, there is no process and formula report that is exactly the same as the content of the steel slag compound fertilizer and its preparation method claimed in the present invention

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] A kind of steel slag compound fertilizer, its preparation method comprises the following steps:

[0032] 1) Accurately weigh the steel slag, slag, and dedusting ash according to the mass ratio of steel slag, slag, and dedusting ash at a ratio of 60:15:25, and add various raw materials that have been weighed into the mixer at a speed of 250r / min Stir for 15 minutes;

[0033] 2) According to the total nutrient N+P 2 o 5 +K 2 O ≥ 25% element ratio requirements, mixed with fertilizer effect correction agent, the correction agent is a mixture of ammonium hydrogen phosphate and ammonium dihydrogen phosphate, and put the weighed various raw materials into the mixer at a speed of 250r / min Stir for 14 minutes to obtain the first product of compound fertilizer;

[0034] 3) coating: take an appropriate amount of chitosan, be mixed with 2% glacial acetic acid and be mixed with the chitosan acetic acid solution of 1.8% in mass fraction, measure the first product of 0.4g compound...

Embodiment 2

[0037] A kind of steel slag compound fertilizer, its preparation method comprises the following steps:

[0038] 1) Accurately weigh the steel slag, slag, and dedusting ash according to the mass ratio of steel slag, slag, and dedusting ash at a ratio of 50:20:30, and add various raw materials that have been weighed into the mixer at a speed of 240r / min Stir for 14 minutes;

[0039] 2) According to the total nutrient N+P 2 o 5 +K 2 O ≥ 30% element ratio requirements, mixed with fertilizer effect correction agent, the correction agent is ammonium hydrogen phosphate, and the weighed raw materials were added to the mixer, and stirred at a speed of 250r / min for 10min to obtain the first product of compound fertilizer ;

[0040] 3) Coating. Concrete coating method is with embodiment 1.

[0041] The above-mentioned steel slag is ordinary carbon steelmaking slag produced by the converter process, which comes from a steel factory, and its chemical composition is mainly TFe:35.32%,...

Embodiment 3

[0043] A kind of steel slag compound fertilizer, its preparation method comprises the following steps:

[0044] 1) Accurately weigh the steel slag, slag, and dedusting ash according to the mass ratio of steel slag, slag, and dedusting ash at a ratio of 55:15:30, and add various raw materials that have been weighed into the mixer at a speed of 200r / min Stir for 14 minutes;

[0045] 2) According to the total nutrient N+P 2 o 5 +K 2 O ≥ 40% element ratio requirements, mixed with fertilizer effect correction agent, the correction agent is a mixture of ammonium hydrogen phosphate, ammonium dihydrogen phosphate, and phosphorus-containing gypsum, and added various raw materials that have been weighed into the mixer, at 230r Stir for 15 minutes at a speed of 1 / min to obtain the first product of compound fertilizer;

[0046] 3) Coating. Concrete coating method is with embodiment 1.

[0047] The above-mentioned steel slag is ordinary carbon steelmaking slag produced by the convert...

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Abstract

The invention provides a steel slag compound fertilizer and a preparation method thereof, and relates to the technical field of environment-friendly agriculture. The preparation method includes the following steps: 1) accurately weighing steel slag, mineral slag and dust ash according to the mass ratio of the steel slag to the mineral slag to the dust ash of (30-80):(0-60):(10-30), adding the weighed raw materials into a stirring machine, and performing stirring at the speed of 150-250 r / min for 5-15 min; 2) adding a fertilizer effect correction agent according to the element proportioning requirement of total nutrients N+P2O5+K2O of >=25%, wherein the correction agent is one or a combination of two or more selected from urea, ammonium hydrogen phosphate, ammonium dihydrogen phosphate andphosphorous-containing gypsum, adding the weighed various raw materials into a stirring machine, and performing stirring at the speed of 150-250 r / min for 5-15 min to obtain a crude compound fertilizer; and 3) performing coating to obtain the finished product. The steel slag compound fertilizer prepared by the method has the characteristics of a good fertilizer effect and a long release period ofthe fertilizer effect, can reach current standard GB 21633-2008 of compound fertilizers, and reduce the land occupation and environmental pollution of metallurgical solid waste, and has the advantagesof a simple process, less investment, and better economic, ecological, environment-friendly, and social benefits.

Description

technical field [0001] The invention relates to the technical field of environmental protection agriculture, in particular to a steel slag compound fertilizer and a preparation method thereof. Background technique [0002] Steel slag is the main solid waste in the iron and steel industry, and its production volume is about 11% to 15% of crude steel output. The rational utilization and effective recovery of steel slag is one of the important symbols of technological progress in the modern iron and steel industry. The comprehensive utilization of steel slag mainly depends on the properties of steel slag, and the physical and chemical properties of steel slag have a great relationship with its chemical composition and structure. The main chemical components in steel slag are CaO, SiO 2 、Al 2 o 3 , FeO, Fe 2 o 3 , MgO, f~CaO, MnO, P 2 o 5 etc. Some steel slags also contain V 2 o 5 , and TiO 2 etc. It can be used in different applications according to the content of di...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C05G3/00
CPCC05B7/00C05G3/00
Inventor 李灿华徐文珍黄贞益查雨虹吴文斌李雁翎倪薇王昭然于巧娣常婕王浩黄强
Owner ANHUI UNIVERSITY OF TECHNOLOGY
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