Method and system for preparing phosphoric acid

A technology of phosphoric acid and phosphate rock, which is applied in the direction of phosphoric acid, phosphorus oxyacids, chemical instruments and methods, etc. It can solve the problems of affecting material reduction, long roasting time, affecting heat transfer efficiency and air permeability, etc., and achieves the goal of improving efficiency Effect

Inactive Publication Date: 2016-07-13
JIANGSU PROVINCE METALLURGICAL DESIGN INST
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Problems solved by technology

[0004] 1. The roasting time is long, generally 1.5-3 hours, or even longer, and the fuel cost is high;
[0005] 2. The ring bottom kiln is used. Since the phosphate rock realizes the reduction and oxidation reaction in the ring bottom kiln at the same time, the pellets must be covered with a film to prevent the re-oxidation of phosphorus in the phosphate rock, which not only affects the heat transfer of the pellets to a certain extent Efficiency and breathability, while increasing the process cost of the "cover

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  • Method and system for preparing phosphoric acid
  • Method and system for preparing phosphoric acid
  • Method and system for preparing phosphoric acid

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preparation example Construction

[0054] In order to facilitate the description of the system for preparing phosphoric acid in specific embodiments of the present invention, the specific implementation method of the system will be described below.

[0055] According to a specific embodiment of the present invention, firstly, the phosphate rock, the reducing agent and the catalyst are mixed in the mixing device 10 to obtain a mixed material. According to a specific embodiment of the present invention, the mass ratio of the above-mentioned raw materials, namely phosphate rock, reducing agent and catalyst, is not particularly limited, and according to a specific embodiment of the present invention, its mass ratio can be 100:(15-20):(1 -2). In this way, the reducing agent and catalyst added in this mass range can achieve sufficient reduction of phosphate rock, and waste of resources can be avoided. According to a specific embodiment of the present invention, the above mass ratio is unexpectedly obtained by the in...

Embodiment 1

[0080] The raw ore composition of a phosphate rock in Yunnan is P 2 o 5 24.78%, CaO 38.98%, SiO 2 Accounting for 13.56%, Al 2 o 3 Accounted for 1.68%, F accounted for 2.23%, anthracite contains 78.92% of fixed carbon, raw material batching conditions are phosphate rock: anthracite: catalyst = 100:18:1.5 (mass fraction), the above materials are added to the mixture during the mixing process of the mixer 3% of the weight of molasses, add an appropriate amount of water, adjust the water content of the mixture to 7%, press the balls through a high-pressure double-roller ball press, and the pressed pellets are ellipsoids with a length of 30mm, a width of 20mm, and a thickness of about 15mm. Enter the chain grate dryer for drying at 240°C. The dried pellets contain less than 2% water. After being screened by the belt, they are sent to the regenerative rotary hearth furnace for reduction. The air-fuel ratio in the rotary hearth furnace is controlled at 9.5 , the temperature of th...

Embodiment 2

[0082] A phosphate mine P in Ningxia2 o 5 Accounting for 35%, the fixed carbon content of anthracite is 77.86%, the raw material ingredients are phosphate ore: anthracite: catalyst = 100:20:2 (mass fraction), the above materials are mixed evenly and added to a pelletizing disc with a diameter of 6 meters for disc For pelletizing, the binder used for pelletizing is bentonite, accounting for 1% of the mixture, the water content of the pellets is controlled at 8%-10%, the diameter of the pellets is 8-12mm, and the carbon-containing pellets are placed into The chain grate dryer is used for drying, the drying temperature is about 240°C, the dried pellets contain less than 2% water, and then sent to the regenerative rotary hearth furnace for reduction. The air-fuel ratio in the rotary hearth furnace is controlled at 9, pre- The temperature of the hot section is 900°C, the preheating time is 5 minutes, the temperature of the reduction section is 1080°C, the reduction time is 32 minut...

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Abstract

The invention provides a method and system for preparing phosphoric acid.The method for preparing phosphoric acid includes the steps that phosphate ore, a reducing agent and a catalyst are mixed to obtain a mixed material; the mixed material is subjected to pelletizing treatment to obtain a globular material; the globular material is dried to obtain a dried globular material; the globular material is subjected to a reduction reaction inside a heat storage type rotary hearth furnace to obtain phosphorus-containing smoke and furnace slag; the phosphorus-containing smoke is subjected to an oxidation reaction to obtain phosphorus pentoxide steam; the phosphorus pentoxide steam reacts with water to obtain phosphoric acid.By the utilization of the method, the preparation efficiency and quality of phosphoric acid can be effectively improved.

Description

technical field [0001] The invention relates to the field of chemical industry. In particular, the present invention relates to methods and systems for producing phosphoric acid. Background technique [0002] The main methods of industrial production of phosphoric acid include wet purification phosphoric acid, thermal phosphoric acid and kiln phosphoric acid. Phosphoric acid is obtained by decomposing phosphate rock powder with sulfuric acid, which is called wet-process phosphoric acid; the phosphate rock is reduced with coke in an electric furnace to obtain yellow phosphorus, and then the yellow phosphorus is oxidized in another device to obtain phosphorus pentoxide (P 2 o 5 ), phosphoric acid is obtained by hydration, which is called electrothermal phosphoric acid. In recent years, domestic wet-process phosphoric acid production enterprises no longer only produce acid for phosphate fertilizers, but have begun to carry out wet-process acid purification, and further devel...

Claims

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Application Information

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IPC IPC(8): C01B25/18
CPCC01B25/185
Inventor 吴道洪曹志成薛逊
Owner JIANGSU PROVINCE METALLURGICAL DESIGN INST
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