Process for producing phosphoric acid by melting method and kiln method
A production process, the technology of French phosphoric acid, applied in phosphoric acid, phosphorus oxyacids, phosphate fertilizers, etc., can solve the problems of no industrial economic value, reduced carbon burning loss, and low phosphorus yield, so as to avoid serious carbon burning loss and realize Productization, avoiding the effect of low phosphorus yield
Pending Publication Date: 2022-03-22
四川马边龙泰磷电有限责任公司
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[0008] Existing kiln phosphoric acid production technology generally adopts tunnel kiln phosphoric acid technology and rotary kiln phosphoric acid technology. Use high-melting point ingredients or make balls or bricks or add a surface isolation layer to carry out reaction and
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[0032] In the following, only some exemplary embodiments are briefly described. As those skilled in the art would realize, the described embodiments may be modified in various different ways, all without departing from the spirit or scope of the present invention.
[0033] Reference in this application to an "embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the present application. The occurrences of this phrase in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. It is understood explicitly and implicitly by those skilled in the art that the embodiments described herein can be combined with other embodiments.
[0034] see Figure 1~2 As shown, the embodiment of the present application provides a production process of phosphoric acid b...
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The invention discloses a process for producing phosphoric acid by a melting method and a kiln method, which comprises the following steps: mixing, grinding and sieving ground phosphate rock, reduced carbon powder and low-melting-point ingredients to obtain a mixed raw material, carrying out reduction reaction on the mixed raw material in a kiln to generate a molten mass and P4 and CO gases, enabling the molten mass to flow towards an overflow port of the kiln, and continuously carrying out reduction reaction to obtain the phosphoric acid. The generated P4 and CO gas continuously rises to be in contact with excess oxygen above for combustion, P2O5 and CO2 are generated, heat is released, a combustion oxidation flue gas layer is formed on the upper portion of the kiln, the heat of the combustion oxidation flue gas layer continuously supplies heat to the melting flow reduction layer through heat radiation until the reaction is complete, and the reaction is completed. And discharging the P2O5-containing mixed gas from the kiln, and washing and absorbing to obtain kiln-process phosphoric acid. According to the method, low-melting-point ingredients are utilized, reaction and mass transfer are carried out in a molten state, the probability that P2O5 and O2 of a combustion oxidation flue gas layer react with a molten flow reduction layer is reduced, and the problems that the phosphorus yield is low and carbon ignition loss is serious due to phosphorus return are solved.
Description
technical field [0001] The invention relates to the technical field of kiln phosphoric acid production, in particular to a melting kiln phosphoric acid production process. Background technique [0002] The principle of kiln phosphoric acid is: the phosphorous (P 4 ) and carbon monoxide (CO) combustion, the heat energy released is used for the heat energy absorbed by the phosphate rock reduction reaction (3+4 type heat release is greater than 1+2 type heat absorption). Simplified chemical reaction of kiln phosphoric acid: [0003] 4Ca 5 F(PO 4 ) 3 +30C+18SiO2 2 →3P 4 ↑+30CO↑+18CaSiO 3 +2CaF 2 ΔH=280061kJ / kg (in P 4 meter, endothermic) (1) [0004] 2CaF 2 +3SiO 2 →2CaSiO 3 +SiF 4 ↑ ΔH=82kJ / kg (in P 4 meter, endothermic) (2) [0005] P 4 +5O 2 →2P 2 o 5 ΔH=-25498kJ / kg (in P 4 meter, exothermic) (3) [0006] 2CO+O 2 →2CO 2 ΔH=-22154kJ / kg (in P 4 meter, exothermic) (4) [0007] The key to kiln phosphoric acid is to combine the reduction reaction of ph...
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Login to View More IPC IPC(8): C01B25/20C01B25/12C05B5/00
CPCC01B25/20C01B25/12C05B5/00
Inventor 王君如周航
Owner 四川马边龙泰磷电有限责任公司