SU1315382A1 - Method for producing phosphorus oxides from raw material - Google Patents

Abstract

The statement relates to the technology of processing phosphate raw materials with the production of phosphorus oxides and phosphoric acid and allows for a cheaper process while maintaining a high degree of utilization of the raw materials. 10 g of silica is mixed with 2.2 g of carbon, which corresponds to the molar ratio of SiO:: C 1: 1.1. The components are mixed. and placed in the bottom of the reactor. At a distance of 20 mm from the surface of the mixture, 16.5 g of tricalcium phosphate (TCP) are placed on the screen partition. The reactor is placed in a laboratory high-temperature furnace, heated to 18.50 K and held at this temperature for 30 minutes. The molar ratio of TCP and SiO in gases, formed by the interaction of SiO and C, is 1: 3.1. The degree of PCP reduction is determined by analyzing the solid phase, i.e. to remove phosphorus from TCP in the gas phase. The reduction rate is 89.9%. 3 tab. e SL

Description

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This invention relates to a process for the processing of phosphate raw materials to produce phosphorus oxides and a phosphoric acid.

The aim of the invention is to reduce the cost of the process while maintaining a high degree of use of raw materials.

EXAMPLE 1. Mix 10 g of silica (SiOj) and 2.2 g of carbon (C), which corresponds to the molar ratio of SiO-: C 1: 1.1. The components are thoroughly mixed and placed in the lower part of the reactor. At a distance of 20 mm from the surface of the mixture, 16.5 g of tricalcium phosphate (TCP) are placed on the screen partition. The reactor is placed in a laboratory high-temperature furnace, heated .. up to 1850 K and maintained at this temperature in. for 30 minutes The molar ratio of TCP and SiO in gases formed by the interaction of SiO2 and C is 1: 3.1. The degree of PCP reduction is determined by analyzing the solid phase, i.e. to remove phosphorus from TCP in the gas phase. According to the data, the degree of reduction is 89.9%. The product of the TCP treatment with gaseous products is phosphorus oxide,

In tab. Table 1 presents comparative data on the costs of conducting a similar process according to the known and proposed technical solutions.

Thus, as follows from the table. 1, the reduction of the cost of the process by reducing the consumption of the reducing agent is 12.34 rubles / ton.

S p and M e p 2. Mix 10 g of SiO ,, and 2.0 C, which corresponds to the molar ratio of SiOj: C 1: 1.0. The components are carefully mixed and placed in the lower part of the reactor. 27.4 g of natural phosphorite composition, wt.%: CaO 45.3; 28.6; ° Si02 19.7; MgO 2.0; ACOZ 1.4; F 0,2; ppt, p. 1.1 which contains 17.1 TKF. Molno.e ratio TKF; 310. Reactor

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with reactants heated to 1900 K and held for 30 minutes. The degree of removal of phosphorus oxides in the gas phase is 90.5%.

In tab. 2 shows the dependence of process indicators on the parameters.

When carbon is abundant above the Si02: C 1: 1.2 ratio, silica is reduced to silicon carbide, and

with an excess of silica i. at a ratio of SiO2,: C 1, the latter remains as unreacted SiO. .

The molar ratio of TKF: 310 1: (3.0-3.2) is selected based on

the fact that when the TCF: SiO ratio is greater than 1: 3.2, the product of the TCP reduction is phosphorus, and if it is less than 1: 3.0, the TCP is not completely reduced.

The proposed temperature range is due to the fact that, at a temperature below 1850 K, silicon monoxide decomposes to SiOj and Si. . Increasing the temperature above 1950 K does not lead to

a significant increase in the yield of phosphorus oxides.

In tab. Figure 3 shows the dependence of the process indicators on the order of operations.

Claims (1)

The method of obtaining phosphorus oxides from tricalcium phosphate containing raw materials at high temperature using a mixture of silica with a carbon-containing reducing agent, characterized in that, in order to reduce the cost of the process while maintaining a high degree of use of raw materials, a mixture of silica with carbon containing is used. reducing agent with a molar ratio of 1: (1, O-1,2), the mixture is heated to 1850 - 1950 K and forming an imis by gases containing silicon monoxide processes the raw materials at a mixture temperatur and a molar ratio of tricalcium phosphate: silicon monoxide 1: (3.0 - 3.2). Raw materials, t: Table 1. Editor O. Bugir Compiled by S. Lotova Tehred I.Popovich Proofreader T. Kolb Order 2267/21 Circulation 455 Subscription VNIIPI USSR State Committee for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab., 4/5 Production and Printing Enterprise, Uzhgorod, Projecto st., 4 Table 3