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Process of compounding and roasting desulfurized cinder and potash ore to produce composite K-Ca-Si-S fertilizer

A desulfurization ash and compound fertilizer technology, applied in the direction of calcium fertilizer, potash fertilizer, inorganic fertilizer, etc., can solve the problems of secondary pollution, occupying a large land environment, unable to meet the needs of agricultural production, etc., and achieve the effect of reducing the amount of addition

Inactive Publication Date: 2007-06-06
广州康沣农业科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Dry and semi-dry desulfurization ash is a large amount and wide range of solid waste produced by major power plants successively launching flue gas desulfurization projects in recent years. Compared with wet flue gas desulfurization by-product gypsum, dry process The semi-dry desulfurization ash contains not only calcium sulfate, but also calcium sulfite, unreacted calcium oxide, calcium hydroxide and calcium carbonate, etc., as well as silicon dioxide and aluminum oxide in fly ash. Therefore, its composition is more complex than that of wet process by-products, and it is also more difficult to use. At present, it is only used for filling and open-air stacking, which not only takes up a lot of land but also causes serious secondary pollution to the environment.
[0003] On the other hand, my country is a country that is extremely scarce in potassium fertilizer resources, and the self-sufficiency rate of potassium fertilizer is less than 10%, which is far from meeting the needs of agricultural production.
However, the production of potassium-calcium-silicon compound fertilizers by compound roasting of dry and semi-dry flue gas desulfurization ash and potassium ore has not been reported at home and abroad.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] The main raw materials are flue gas desulfurization ash of circulating fluidized bed boiler in Guangzhou Hengyun Power Plant and potassium feldspar produced in Yantai, Shandong. The composition of desulfurization ash and potassium feldspar is shown in Table 1 after analysis.

[0021] al 2 o 3

[0022] The chemical composition of the desulfurization ash in Table 1 was converted into two compound components of calcium oxide and calcium sulfate, and the chemical composition of potassium feldspar was also converted into the mineral composition of pure potassium feldspar. According to the molar ratio of potassium feldspar: calcium sulfate: calcium oxide 1:1:6.3, add additive A sodium sulfate 3%, pulverize to 200 mesh, mix evenly, heat and roast, the roasting temperature is 1050 ℃, the roasting time After 2 hours, after quenching and cooling, and ball milling to 200 mesh, potassium calcium silicon sulfur compound fertilizer is obtained. After being dissolved ...

Embodiment 2

[0024]The flue gas desulfurization ash of circulating fluidized bed of Guangzhou Hengyun Power Plant is blended with the potassium feldspar produced from the Guangning pegmatite mine in Guangdong. The composition of the desulfurization ash is as shown in Example 1. The content of potassium oxide in Guangdong Guangning potassium feldspar is 10.18%. According to the molar ratio of potassium feldspar: calcium sulfate: calcium oxide 1: 1.2: 6.3, add the auxiliary agent A sodium fluoride 4.5%, and pulverize until 250 After mixing evenly, heat and roast, the roasting temperature is 1000°C, the roasting time is 2.5 hours, the content of soluble potassium oxide in the fired product sample is 5.68%, soluble calcium oxide is 1.59%, silicon dioxide is 0.35%, and the content of other trace elements B 6.04ppm; Mg 59.31ppm; Mo 3.19ppm; Se 4.58ppm; Fe 0.86ppm; Mn 0.17ppm; Cu not detected; Ni not detected. The content of heavy metals is As 1.21m; Cd 0.09ppm; Cr 9.58ppm; Pb0.35ppm; Zn 0ppm. p...

Embodiment 3

[0026] The flue gas desulfurization ash of the circulating fluidized bed of Guangzhou Hengyun Power Plant was blended with Handan K-feldspar sandstone in Hebei Province, and the composition of the desulfurization ash was as shown in Example 1. The content of potassium oxide in Handan potassium feldspar sandstone of Hebei Province is 9.03%, according to its potassium feldspar: calcium sulfate: the molar ratio of calcium oxide 1: 1: 8.4 feeds, adds auxiliary agent A sodium chloride 5%, pulverizes 220 mesh, after mixing evenly, heating and roasting, the roasting temperature is 1030°C, and the roasting time is 3 hours. The content of soluble potassium oxide in the burnt sample is 5.18%, soluble calcium oxide is 1.85%, silicon dioxide is 0.1%, and the content of other trace elements is B 6.01ppm; Mg 191.85ppm; Mo 2.68ppm; Se 0.86ppm; Fe 16.09ppm ; Mn 0.54ppm; Cu not detected; Ni not detected. The content of heavy metals is As 0.42ppm; Cd 0.11ppm; Cr 9.01ppm; Pb 0ppm; Zn0ppm. pH=1...

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Abstract

The present invention discloses process of compounding and roasting desulfurized cinder and potash ore to produce composite K-Ca-Si-S fertilizer. The composite K-Ca-Si-S fertilizer is produced with potash ore 25-55 wt%, desulfurized cinder 15-50 wt%, limestone 5-55 wt% and additive 2-5 wt%, and through mixing, milling, roasting at 1000-1050 deg.c for 2-3 hr, cooling and ball milling. The production process has desulfurized cinder as one kind of solid waste utilized and potash ore heat decomposed to produce the fertilizer with soluble potassium oxide, soluble Ca, Si and S compounds and trace elements. The additive can lower the potash ore decomposing temperature from 1100-1150 deg.c to 1000-1050 deg.c.

Description

technical field [0001] The invention relates to the comprehensive utilization of solid waste in the technical field of environmental protection, in particular to a method for producing potassium-calcium-silicon-sulfur compound fertilizer by compound roasting desulfurization ash and potassium ore. Background technique [0002] Dry and semi-dry desulfurization ash is a large amount and wide range of solid waste produced by major power plants successively launching flue gas desulfurization projects in recent years. Compared with wet flue gas desulfurization by-product gypsum, dry process The semi-dry desulfurization ash contains not only calcium sulfate, but also calcium sulfite, unreacted calcium oxide, calcium hydroxide and calcium carbonate, etc., as well as silicon dioxide and aluminum oxide in fly ash. Therefore, its composition is more complicated than that of wet process by-products, and it is also more difficult to use. At present, it is only used for filling and stacki...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C05G1/00C05D1/02C05D3/00
Inventor 石林
Owner 广州康沣农业科技有限公司
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