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Method for preparing sintered pellets from low-grade phosphorite and waste of phosphorus chemical industry

A low-grade, phosphorus chemical technology, applied in the direction of chemical instruments and methods, phosphorus compounds, phosphate material treatment, etc., can solve the problem that phosphorus slag acid cannot be directly used, and achieve large batch processing capacity and less binder consumption , the effect of high production efficiency

Inactive Publication Date: 2020-05-22
ZHENGZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The present invention provides a low-grade phosphate rock and phosphorous chemical waste in the prior art for the defect that the waste phosphate slag acid in the production of low-grade phosphate rock, yellow phosphorus under-screen ore, under-screen carbon and wet-process phosphoric acid cannot be directly utilized. Process for preparing sintered pellets

Method used

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  • Method for preparing sintered pellets from low-grade phosphorite and waste of phosphorus chemical industry
  • Method for preparing sintered pellets from low-grade phosphorite and waste of phosphorus chemical industry
  • Method for preparing sintered pellets from low-grade phosphorite and waste of phosphorus chemical industry

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] Raw materials: yellow phosphorus sieved ore, yellow phosphorus sieved charcoal, collection location: Yunnan Jinning Yellow Phosphorus Co., Ltd.; low-grade phosphate rock, phosphoric acid slag acid, collection location: Yunnan Phosphate Group Co., Ltd.

[0043]The main chemical composition of yellow phosphorus under-screen ore in this example is shown in Table 1:

[0044] Table 1

[0045]

[0046] The main chemical composition of low-grade phosphate rock in this example is shown in Table 2:

[0047] Table 2

[0048]

[0049] In this example, the main chemical composition of the charcoal under the sieve of yellow phosphorus is shown in Table 3:

[0050] table 3

[0051]

[0052] The main chemical composition of phosphoric acid slag acid is shown in Table 4 in this example:

[0053] Table 4

[0054]

Embodiment approach

[0056] The yellow phosphorus sieved ore, low-grade phosphate rock and yellow phosphorus sieved charcoal are mixed according to the mass ratio of 45:55:15 with an electronic scale; %), to obtain the powdery material; the powdery material is added to the binder phosphorous slag acid (P 2 o 5 concentration of 35%) into a disc granulator to granulate to a particle size of 20-50mm (the sieve residue is less than 5%) to obtain mixed pellets; put the mixed pellets into the rotary kiln and use yellow phosphorus tail gas as a heat source , and dried at 200° C. for 15 minutes to obtain dry pellets; the dry pellets are put into the furnace together with conventional yellow phosphorus charge (phosphorite, silica, coke) to prepare yellow phosphorus.

[0057] In this example, pellet composition analysis is shown in Table 5:

[0058] table 5

[0059]

[0060]

[0061] In this example, the experimental results are shown in Table 6:

[0062] Table 6

[0063]

[0064] It can be se...

Embodiment 2

[0066] Raw materials: yellow phosphorus sieved ore, yellow phosphorus sieved charcoal, collection location: Yunnan Pingbian Yellow Phosphorus Factory; low-grade phosphate rock, phosphoric acid slag acid, collection location: Yunnan Phosphate Group Co., Ltd.

[0067] In this example, the main chemical composition of the yellow phosphorus under-screen ore is shown in Table 7:

[0068] Table 7

[0069]

[0070] The main chemical composition of low-grade phosphate rock in this example is shown in Table 8:

[0071] Table 8

[0072]

[0073] In this example, the main chemical composition of the charcoal under the sieve of yellow phosphorus is shown in Table 9:

[0074] Table 9

[0075]

[0076] The main chemical composition of phosphoric acid slag acid is shown in Table 10 in this example:

[0077] Table 10

[0078]

[0079] method of execution:

[0080] The yellow phosphorus sieve ore, low-grade phosphate rock and yellow phosphorus sieve charcoal are mixed accordi...

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Abstract

The invention discloses a method for preparing sintered pellets from low-grade phosphorite and the waste of the phosphorus chemical industry, belonging to the technical field of chemical production. The preparation method comprises the following steps: mixing undersize ores of a yellow phosphorus process with low-grade phosphorite according to a mass ratio of 45: (50-60), and adding undersize carbon of the yellow phosphorus process to obtain a mixed material, wherein the undersize carbon of the yellow phosphorus process accounts for 10-20% of the total mass of the mixture of the undersize oresand the low-grade phosphorite; grinding the mixed material obtained in the previous step to a particle size of 60-200 meshes so as to obtain a powdery material; putting the powdery material obtainedin the previous step into a disc granulator, spraying an adhesive, namely phosphorus slag acid, and carrying out granulating until the particle size is 20-80 mm so as to obtain mixed pellets, whereinthe concentration of P2O5 in the phosphorus slag acid is 33-36%; putting the mixed pellets obtained in the previous step into a rotary kiln, and drying the mixed pellets at 180-250 DEG C for 10-30 minutes by using yellow phosphorus tail gas as a heat source so as to obtain dried pellets; and putting the dried pellets and a conventional yellow phosphorus furnace charge into a furnace to prepare yellow phosphorus. According to the invention, the undersize ores and the undersize carbon of the yellow phosphorus process, the low-grade phosphorite and the yellow phosphorus tail gas are directly utilized in a high-valued mode, and meanwhile, waste phosphorus slag acid in wet-process phosphoric acid production can be utilized.

Description

technical field [0001] The invention relates to a method for preparing sintered pellets, in particular to a method for preparing sintered pellets from low-grade phosphate rock and phosphorus chemical waste, and belongs to the technical field of chemical production. Background technique [0002] my country's phosphate rock resources are rich and concentrated, but it has been found that most of the resources are low-grade and the reserve level is low. Industrial deposits are mainly concentrated in five provinces of Yunnan, Guizhou, Sichuan, Hubei, and Hunan. The reserves of these five provinces account for the national total. 79% of the national total, basic reserves accounted for 86% of the national total, resources accounted for 94% of the national total, and ascertained resource reserves accounted for 85% of the national total. The resources are characterized by less rich ore, more lean ore, and more refractory ore, and the retained content of phosphate rock is P 2 o 5 The...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B25/01C01B25/027
CPCC01B25/01C01B25/027
Inventor 姚远侯翠红王好斌谷守玉侯黎爽井红权
Owner ZHENGZHOU UNIV
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