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Method for producing phosphoric acid through ground phosphate rock in fast hot-melting mode

A technology of phosphate rock powder and hot-melting method, applied in the chemical industry, can solve the problems of difficulty in recovering the heat energy of phosphorus sludge oxidation, consumption of sulfuric acid phosphogypsum pollutants, and lack of perfect industrial production equipment, and achieves easy realization of mechanized automation and convenient control. Easy, simple structure effect

Inactive Publication Date: 2012-11-07
黄靖元
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Problems solved by technology

The main disadvantage of the thermal phosphoric acid process is that yellow phosphorus products with high power consumption are required as raw materials, and the production cost of phosphoric acid is high
The main disadvantages of the wet process phosphoric acid process are: low concentration of phosphoric acid, high content of various impurities in phosphoric acid, consumption of a large amount of sulfuric acid and production of a large amount of phosphogypsum pollutants. This process technology has been listed as restricted in the national industrial structure adjustment catalog in 2012 Development Directory
The biggest disadvantage is that the equipment investment of blast furnace yellow phosphorus is large, the control is complicated, the energy consumption is high, the heat energy recovery of phosphorus sludge oxidation is difficult, and the process is long
At present, domestic kiln phosphoric acid process technology is still in the research and development process, and there is no complete and successful industrial production device in operation.

Method used

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  • Method for producing phosphoric acid through ground phosphate rock in fast hot-melting mode

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Embodiment Construction

[0015] 1. Raw materials: phosphate rock powder (P 2 o 5 Content: by 20%, CaO content: by 50%, SiO2 content: by 13%, grinding to fineness: 80-100 mesh). Silica powder (SiO 2 Content: by 90%, ground to fineness: 80-100 mesh). Ingredients ratio according to CaO / SiO 2 Calculated as 1.4. The mixing ratio of phosphate rock powder and silica powder: phosphate rock powder 100kg; silica powder should be added = (50÷1.4-SiO in phosphate rock 2 Content 13%)÷0.9=25.24kg. According to the mixing ratio of phosphate rock powder and silica powder: 100:25.24 (mass ratio), the ingredients are mixed and evenly mixed, and put into the feeding bin for later use. Coal combustion: (bituminous coal calorific value ≥ 5000 kcal, carbon content is 65%, fineness: 90 mesh pass rate ≥ 95%, coal ash melting point ≤ 1350 ℃), to control the oxygen content in the kiln gas 1-2.5 % (volume content) to regulate the addition of pulverized coal and hot air flow.

[0016]2. Ignition and heating: add wood or ...

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Abstract

The invention relates to a technique method for producing phosphoric acid in fast hot-melting mode with low-quality and medium-quality ground phosphate rock and silica powder as the raw materials and pulverized coal as the heating energy. The method is characterized in that the ground phosphate rock and the silica powder finish the chemical reaction of calcium phosphate and silica in a rotary-flow melting calcining kiln at the temperature of 1450-1800 DEG C within 2 minutes, calcium metasilicate melted slag and phosphorus pentoxide furnace gas can be produced, phosphoric acid is obtained through heat exchanging, dedusting and hydration absorption of the furnace gas, and cement clinker can be obtained by adding proper amount of additives such as calcium carbonate or calcium oxide powder in the calcium metasilicate melted slag at the temperature of 1400 DEG C. By means of the method, phosphorus pentoxide is prepared from phosphate ore in one step directly, the existing processes of phosphate ore reduction and phosphorus oxidization are omitted, carbon for reducing is saved, and the technological process is simplified. The puzzle that in the existing rotary kiln process, tunnel kiln process and blast furnace process, materials become rings, the kiln temperature is difficult to control, reaction rate is low, the device cannot operate continuously, and industrial application is difficult is solved.

Description

technical field [0001] The invention relates to a process method for generating phosphoric acid by rapid hot-melt method, which uses phosphate rock powder and silica powder as raw materials and coal powder as heating energy, and belongs to the technical field of chemical industry. Background technique [0002] The main methods of the existing industrial production of phosphoric acid are: wet phosphoric acid, thermal phosphoric acid and kiln phosphoric acid. The process of thermal phosphoric acid is: use electric furnace yellow phosphorus product as raw material, yellow phosphorus oxidizes with air to generate phosphorus pentoxide gas, and absorbs it with water to obtain thermal phosphoric acid product. The main disadvantage of the thermal phosphoric acid process is that yellow phosphorus products with high power consumption are required as raw materials, and the production cost of phosphoric acid is high. The process of wet-process phosphoric acid is: react with phosphate r...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B25/18
Inventor 李兴德
Owner 黄靖元
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