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Method for producing phosphoric acid and jointly producing cement and synthetic ammonia by using phosphorus ores, limestone and silica

A technology of limestone and phosphate rock, applied in the fields of comprehensive utilization of resources and chemical production, can solve problems such as phosphoric acid-free co-production of cement, synthetic ammonia, etc., and achieve the goal of eliminating environmental pollution by tail gas emissions, improving overall value, and high utilization of raw materials. Effect

Active Publication Date: 2014-01-08
KINGENTA NORSTERRA CHEM CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] According to the literature search, there is no public report on the use of kiln method (or blast furnace method) to synthesize ammonia from phosphoric acid tail gas, nor any public report on the production of phosphoric acid co-production of cement and synthetic ammonia

Method used

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  • Method for producing phosphoric acid and jointly producing cement and synthetic ammonia by using phosphorus ores, limestone and silica
  • Method for producing phosphoric acid and jointly producing cement and synthetic ammonia by using phosphorus ores, limestone and silica
  • Method for producing phosphoric acid and jointly producing cement and synthetic ammonia by using phosphorus ores, limestone and silica

Examples

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Effect test

Embodiment 1

[0051] Raw material: medium and low grade phosphate rock, collection location: Guizhou Weng'an Mining Industry

[0052] The main chemical composition of medium and low grade phosphate rock is shown in the table below:

[0053]

[0054] A method for producing phosphoric acid co-production cement and synthetic ammonia with phosphate rock, limestone and silica, comprising steps as follows:

[0055] (1) Preparation of phosphoric acid

[0056] The medium and low-grade phosphate rock, silica, limestone and coke are mixed according to the mass ratio of 1:0.5:1.2:1.6. After grinding, pass through a 100-mesh sieve, add water to make a 5mm spherical block, and calcinate in a blast furnace at a temperature of 1150°C for 60 Minutes, solid slag and furnace gas are obtained. The furnace gas is cooled by a water bath to recover crude phosphorus and sludge phosphorus. The crude phosphorus and sludge phosphorus are recovered by cooling in a water bath. The water temperature is 20°C, and t...

Embodiment 2

[0064] Raw material: medium and low-grade phosphate rock, collection location: Jinde Mining, Guizhou

[0065] The main chemical composition of medium and low grade phosphate rock is shown in the table below:

[0066]

[0067] A method for producing phosphoric acid co-production cement and synthetic ammonia with phosphate rock, limestone and silica, comprising steps as follows:

[0068] (1) Preparation of phosphoric acid

[0069] The medium and low-grade phosphate rock, silica, limestone and coke are mixed according to the mass ratio of 1:0.4:0.6:0.9. After grinding, pass through a 100-mesh sieve, add water to make a spherical block of 8mm, and calcinate it in a blast furnace at a temperature of 1300°C for 40 Minutes, solid slag and furnace gas are obtained. The furnace gas is cooled by a water bath to recover crude phosphorus and sludge phosphorus. The crude phosphorus and sludge phosphorus are recovered by cooling in a water bath. The gas is then dedusted to recover the ...

Embodiment 3

[0077] Raw material: medium and low-grade phosphate rock, collection location: Yunnan Zhanyideze phosphate rock

[0078] The main chemical composition of medium and low grade phosphate rock is shown in the table below:

[0079]

[0080] A method for producing phosphoric acid co-production cement and synthetic ammonia with phosphate rock, limestone and silica, comprising steps as follows:

[0081] (1) Preparation of phosphoric acid

[0082] The medium and low-grade phosphate rock, silica, limestone and coke are mixed according to the mass ratio of 1:0.2:1.5:1.8. After grinding, pass through a 150-mesh sieve, add water to make a 15mm spherical block, and calcinate in a blast furnace at a temperature of 1450°C for 30 Minutes, solid slag and furnace gas are obtained. The furnace gas is cooled by a water bath to recover crude phosphorus and sludge phosphorus. The crude phosphorus and sludge phosphorus are recovered by cooling in a water bath. The gas is then dedusted to recove...

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Abstract

The invention relates to a method for producing phosphoric acid and jointly producing cement and synthetic ammonia by using phosphorus ores, limestone and silica. The method comprises the following steps of that the phosphorus ores, the limestone and the silica are blended, ground, pelletized and subjected to blast furnace roasting to obtain solid furnace slag and a furnace gas, the furnace gas is firstly cooled through a water bath to recover rough phosphorus and phosphorus sludge, and the furnace gas cooled through the water bath is dedusted to recover the phosphorus sludge; the rough phosphorus and the phosphorus sludge are oxidized and combusted and then a phosphoric anhydride gas is absorbed through water to prepare phosphoric acid; an obtained furnace tail gas is desulfurized and transformed to form a feed gas used for synthetic ammonia and then the feed gas is desulfurized, decarburized and subjected to gas purification to produce synthetic ammonia. The method disclosed by the invention opens a new way for the resource integrated utilization of the blast furnace process phosphoric acid tail gas by directly purifying the blast furnace process phosphoric acid tail gas obtained after the phosphorus sludge is recovered to be used as a raw material used for synthetic ammonia, ingeniously carries out integrated utilization on various raw materials and enhances the integral value of a process.

Description

technical field [0001] The invention relates to a method for producing phosphoric acid co-production cement and synthetic ammonia by using phosphate rock, limestone and silica, belonging to the technical fields of resource comprehensive utilization and chemical production. Background technique [0002] The industrial production process of phosphoric acid is mainly divided into three types: wet process phosphoric acid, thermal process phosphoric acid and kiln process (or blast furnace process) phosphoric acid. Wet process phosphoric acid refers to the use of sulfuric acid to decompose medium and high-grade phosphate rock to produce phosphoric acid. Thermal phosphoric acid refers to the production of phosphoric acid by burning, oxidizing, and hydrating yellow phosphorus in the electric furnace method. The phosphoric acid obtained by this method is of good quality, but consumes a lot of energy. Both of these traditional production processes use high-grade phosphate rock as raw...

Claims

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Application Information

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IPC IPC(8): C01B25/18C01C1/04C04B7/24
CPCY02P40/10
Inventor 胡兆平刘阳庞世花王震张营
Owner KINGENTA NORSTERRA CHEM CO LTD
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