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A method of decomposing phosphate rock to produce phosphoric acid

A phosphate rock and phosphoric acid technology, applied in the direction of phosphoric acid, phosphorus oxyacids, chemical instruments and methods, etc., can solve the problems of low decomposition conversion rate of phosphate rock and affect the decomposition conversion rate of phosphate rock, and achieve high decomposition rate Effect

Active Publication Date: 2019-02-12
CINF ENG CO LTD
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Problems solved by technology

However, the CaSiO produced during the carbothermal reduction reaction of phosphate rock in these several melting processes 3 at high temperature with P 4 The oxidation reaction product P 2 o 5 It can continue to react and re-convert into two starting reactants, Ca3(PO4)2 and SiO2, which seriously affects the decomposition conversion rate of phosphate rock.
That is to say, these melting methods all have the defect of low decomposition conversion rate of phosphate rock

Method used

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  • A method of decomposing phosphate rock to produce phosphoric acid
  • A method of decomposing phosphate rock to produce phosphoric acid

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Embodiment Construction

[0036] Such as figure 1 As shown, the system for producing phosphoric acid in this embodiment consists of the following: side blowing furnace 1, water wall 1a, reduction zone economizer 2, booster fan 3, injection device 4, P 4 And CO and C quality spray gun 5, P 4 And CO spray gun 6, oxygen-enriched gas spray gun 7, heating electrode 8, oxidation zone economizer 9, conveying fan 10, primary absorption tower 11, primary phosphoric acid cooler 12, primary phosphoric acid circulation pump 13, secondary absorption tower 14. Secondary phosphoric acid cooler 15. Secondary phosphoric acid circulation pump 16.

[0037] Such as figure 2 As shown, the injection device 4 includes two parallel injection tanks 41, C substance is added from the upper end of the injection tank 41, and the P 4 The mixed gas with CO is sent into the spray tank 41 respectively in two pipelines, and the gas delivery switch valve 42 is connected respectively on the two pipelines, and the P 4 Mixed gas with ...

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Abstract

The invention discloses a method for producing phosphoric acid by decomposing phosphate ore. A side-blown furnace is taken as a phosphate ore decomposition furnace and is divided into two parts including an oxidation zone and a reduction zone, wherein gas phase sections of the two parts are completely isolated by a partition wall, and the partition wall only goes deep into a liquid surface of a melt; gas for an oxidation reaction and C substances for a reduction reaction in the side-blown furnace are sprayed into the melt from two sides of the side-blown furnace respectively, a carbon heat reaction reduction zone and a P4 and CO mixed gas oxidation reaction zone are completely separated, P4 and CO mixed gas produced by the reduction zone is introduced into the oxidation zone of the melt section for cyclic utilization, heat can be directly transferred between the oxidation reaction and the reduction reaction of the melt section, so that heat during the oxidation reaction can be transferred as fully as possible and counteracts consumption heat of the reduction reaction to decompose the phosphate ore through own reaction heat and guarantee a higher phosphate ore decomposition rate, and the yield of a phosphoric acid product is increased while energy is saved.

Description

technical field [0001] The invention relates to a technology for processing phosphate rock in the field of metallurgy, in particular to a method for decomposing phosphate rock to produce phosphoric acid. Background technique [0002] The process of thermal treatment of phosphate rock is to melt and reduce the phosphate rock added with carbon (coal) in an electric furnace to produce P 4 (yellow phosphorus), CO and CaSiO 3 Pyrometallurgical process of molten slag. The technology was first successfully trial-produced in the UK in 1888, and then successfully realized industrial production in France, the United States and other countries, and has been well known and adopted by the world. Since the carbothermal reaction in the phosphate rock smelting reduction process is an endothermic reaction with high energy consumption, a large amount of electric energy is consumed. Therefore, the electric furnace yellow phosphorus technology is a very uneconomical phosphate rock smelting p...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B25/18
CPCC01B25/185Y02P20/10
Inventor 朱智颖周桂月吴桂荣袁爱武
Owner CINF ENG CO LTD
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