Method of producing phosphoric acid by directly reducing phosphorus ore and co-producing Portland cement grog

A technology of portland cement and phosphate rock, applied in the direction of phosphoric acid, phosphorus oxyacid, etc., can solve the problems of large amount of siliceous raw materials, high consumption of raw materials, and only about 80% phosphorus utilization rate, so as to reduce raw materials and energy The effect of consumption and cost reduction

Inactive Publication Date: 2007-09-12
HUBEI SANXIN PHOSPHORIC ACID
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  • Description
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Problems solved by technology

(3) New kiln phosphoric acid process: this process has not been successfully applied in the production, but there are reports in the patented method, such as: the patent number of Changsha Institute of Mining and Metallurgy in China is 93111447.0 "a method of directly reducing phosphate rock to produce phosphoric acid The invention patent of "Method" requires medium-grade phosphate rock, and the utilization rate of phosphorus is only about 80%. Medium-grade p

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0024] Using phosphate rock from Hubei Shennongjia Mining Company, chemical analysis: CaO42.8%\MgO1.2%\P 2 o 5 30.7%\SiO 2 11.2%\Al 2 o 3 1.0%\Fe 2 o 3 0.7%; coke analysis: C 81%; according to the number of molecules CaO: SiO 2 =1-6:0.8-1 ratio requirements, this sample is 4.1:1, no need to add calibration raw materials; phosphate rock: coke according to P 2 o 5 %:C%=1:0.2-1.5 The ingredients are mixed well, and the fineness of the mixture is required to be ≥100 mesh; after mixing well, add about 8% water evenly in the ball forming tray to make the material into Φ5-50mm small balls, and then put them into In the 610×610×450mm square refractory material container, put it into a 1.5×1.5M kiln car after being filled, and enter the 36.98×1.9×1.5M tunnel kiln after preheating, and the temperature rises to 1350°C-1550°C, and the material container The total running time in the kiln is 12 hours, and its running process is automatically controlled by PLC programming. The high...

example 2

[0025] Example 2: Using phosphorus-containing tailings from Hubei Shennongjia Mining Company, Yuanan coal gangue, and Yichang lime, chemical analysis:

[0026] CaO

[0027] According to P 2 o 5 %:C%=1:0.8 After the coal gangue is prepared, then according to the number of molecules CaO:SiO 2= 4:1 ratio to add calcium correction raw lime, mix evenly, the mixture requires ≥100 mesh, after mixing well, add about 8% water evenly in the ball forming plate, and make the material into Φ5-50mm balls, after After drying, put it into a 610×610×450mm square refractory material container, code it into a 1.5×1.5M kiln car, enter a 36.98×1.9×1.5M tunnel kiln, and heat it up to 1200-1450°C. The material container is in the kiln The total running time is 16 hours, and its running process is automatically controlled by PLC programming. The high-temperature gas is pumped into the Φ1.4×8.2M hydration tower and absorbed by circulating acid to obtain phosphoric acid. After testing, t...

example 3

[0029] Using phosphorite from Hubei Shennongjia Mining Company, chemical analysis:

[0030] CaO: 48.80\SiO 2 :8.65\P 2 o 5 :33.24\Al 2 o 3 : 0.57\Fe 2 o 3 : 0.86\MgO: 2.12\LOSS: 5.05 Rice husk powder: fixed carbon C: 42.8\ volatile matter 52.4\ acid insoluble matter 0.16, silica powder: SiO2: 97.33, this example is based on the number of molecules CaO: SiO 2 =4.5:1, adding silica powder as a calibration raw material, according to P 2 o 5 %:C%=1:1.2 Add rice husk powder and mix evenly. The fineness of the mixture is required to be ≥100 mesh. After mixing well, add about 8% water evenly in the ball forming pan to make the material into small balls of Φ5-50mm , after drying, put it into a 610×610×450mm square refractory material container, put it into a 1.5*1.5M kiln car, and enter a 36.98×1.9×1.5M tunnel kiln. After preheating, the temperature is raised to 1200°C-1600°C. The total running time in the kiln is 12 hours, and its running process is automatically controlled ...

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Abstract

This invention discloses a method for recovering phosphorite to prepare highly concentrated phosphoric acid and by-product Portland cement clinkers, which increases proportion of Ca and Si of various levels of phosphorite P2O5>=6%, utilizes the Ca, Si, Al and Fe oxides contained in the phosphorite and adds carbon reducers and small amount of Si or Si correction material to be mixed and added with water to process balls or other shapes to be dried and put into a container of fireproof material then enters into a tunnel stove to get phosphor vapour and CO to be asorbed by a hydrate tower to get densed phosphor, and materials in the container are cooled to become Portland cement clinkers.

Description

technical field [0001] The invention relates to a method for preparing phosphoric acid and Portland cement clinker, in particular to a 2 o 5 A method for directly producing high-concentration phosphoric acid and Portland cement clinker from medium and low-grade phosphate rock with a concentration of ≥6% and the tailings after beneficiation of the phosphate rock. Background technique [0002] The industrial production methods of phosphoric acid mainly include the following: (1) Wet process phosphoric acid: use sulfuric acid to decompose phosphate rock to produce phosphoric acid. This method requires a large amount of high-quality phosphate rock and sulfuric acid, and produces a large amount of phosphogypsum waste residue. (2) Thermal phosphoric acid: Yellow phosphorus is produced by electric furnace method, and then burned and absorbed to produce phosphoric acid. This method requires a large amount of electric energy and medium and high-grade phosphate rock lump ore. (3) Ne...

Claims

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Application Information

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IPC IPC(8): C01B25/18C04B12/02
Inventor 张定斌汤才洲
Owner HUBEI SANXIN PHOSPHORIC ACID
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