Method for producing feed-grade tricalcium phosphate by utilizing low-calorific-value tail gas

A technology of tricalcium phosphate and low calorific value, which is applied in the field of tricalcium phosphate and calcium phosphate, and can solve the problems of high cost of feed grade tricalcium phosphate and insufficient environmental protection

Pending Publication Date: 2020-07-07
WENGFU (GRP) CO LTD
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Problems solved by technology

However, the current supply of fuels such as heavy oil and natural gas fluctuates, and th

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  • Method for producing feed-grade tricalcium phosphate by utilizing low-calorific-value tail gas

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[0039] The method of producing feed-grade tricalcium phosphate using low calorific value tail gas provided by a company of the present invention, the main steps are as follows:

[0040] (1) Phosphate rock powder drying

[0041] The wet phosphate rock powder is sent to the dryer, so that the moisture content after drying meets the technological requirements; among them, in the phosphate rock powder drying, the drying kiln uses low calorific value tail gas to burn, and the drying temperature is 150℃~1000℃. Drying method: co-current or counter-current; the moisture content of the phosphate rock powder after drying is controlled to be ≤5%; the drying combustion device is a low-calorific value tail gas combustion device, the combustion temperature is 600℃~1200℃; the quality of effective combustion components in the low calorific value tail gas The score is 95%;

[0042] The composition of the wet phosphate rock powder is calculated by mass fraction as: P 2 O 5 Content 15%~50%, CaO 30%~60...

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Abstract

The invention discloses a method for producing feed-grade tricalcium phosphate by utilizing low-calorific-value tail gas. The method comprises the following steps: (1) burning ground phosphate rock byutilizing the low-calorific-value tail gas and drying; (2) mixing and ball milling; (3) performing disc granulation; (4) calcining and defluorinating the low-calorific-value tail gas; (5) air heat storage and temperature rise; (5) cooling, crushing and sieving; (6) circularly crushing and screening, and ball-milling a semi-finished product; (7) screening and removing iron; and (8) packaging products. The method has the following advantages: (1) the raw material components and the particle size range of the ground phosphate rock are specified; (2) low-calorific-value tail gas combustion is fully utilized for heat storage and temperature rise of combustion-supporting air; (3) a low-calorific-value tail gas combustion technology and a co-combustion technology are fully utilized; (4) steam isadded in the calcining process to promote decomposition and defluorination of the phosphate ore; and (5) saturated steam and superheated steam are produced by fully utilizing calcined tail gas, so that energy is saved, and energy consumption and production cost are reduced. The method is very suitable for being popularized and used in enterprises producing feed-grade tricalcium phosphate products.

Description

technical field [0001] The present invention relates to phosphate, yellow phosphorus production, blast furnace smelting, etc., and to combustion systems, especially to calcium phosphate, and further to tricalcium phosphate. Background technique [0002] The sintering technology of feed grade tricalcium phosphate includes high-silicon method, low-silicon method, low-alkali method, sodium salt phosphoric acid method and phosphoric acid method. Production scale. Feed-grade tricalcium phosphate sintering process combustion currently common fuel types include natural gas and heavy oil fuel. Due to downstream deep processing, the supply of these two types of fuel fluctuates; the new type of yellow phosphorus tail gas and other low calorific value tail gas fuel combustion technology is adopted, that is, the yellow phosphorus device is comprehensively utilized. The by-product of yellow phosphorus tail gas (low calorific value tail gas such as blast furnace gas) solves the environme...

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Application Information

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IPC IPC(8): C01B25/32F23G7/06F26B3/02
CPCC01B25/328C01B25/32F26B3/02F23G7/06C01P2006/80F23G2209/14Y02P20/129
Inventor 王邵东段仕东刘成罗文龙
Owner WENGFU (GRP) CO LTD
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