Method for preparing phosphoric acid and byproduct building brick by using phosphatic ore tailings after phosphate ore dressing

A technology for construction and tailings, applied in the direction of phosphorus oxyacid, phosphoric acid, sustainable waste treatment, etc., can solve only about 80%; problems such as the Chemical Fertilizer Research Institute of the Ministry of Chemical Industry, and achieve good social and economic benefits

Inactive Publication Date: 2006-09-27
HUBEI SANXIN PHOSPHORIC ACID
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  • Abstract
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Problems solved by technology

(3) New kiln process: This process has not been successfully applied in production, but there are reports in the patented method, such as: the patent number of Changsha Institute of Mining and Metallurgy is 93111447.0, and the name is a kind of direct reduction of phosphate rock to produce phosphoric acid. The invention patent of the method, which requires medium-grade phosphate rock, and the utilization rate of phosphorus is only about 80%; Grade Phosphate Rock

Method used

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Embodiment Construction

[0012] The working principle of the present invention is as follows:

[0013] The invention uses a tunnel kiln as the main reaction equipment to complete the reduction of phosphate rock and the oxidation reaction of phosphorus, and obtains phosphoric acid through absorption in a flue gas absorption tower. The reduction of phosphate rock uses carbon-containing raw materials such as coke or coal or coal gangue as a reducing agent, adding silica powder, kaolin participates in the reduction reaction, and generates calcium silicate (CaO·SiO 2 ), tricalcium aluminate (3CaO·Al 2 o 3 ), they are the main components that form the strength of bricks.

[0014] The response is as follows:

[0015]

[0016] The phosphorus vapor and CO gas produced by the reaction supply a certain amount of O in the kiln 2 Make it oxidize:

[0017]

[0018]

[0019] The heat released by the oxidation reaction is used to maintain the reaction temperature, which can reduce fuel consu...

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Abstract

The invention discloses a preparing phosphoric acid and by-product building brick method by debris with phosphor after phosphorus ore dressing ore, which comprises the following steps: adding in dinas rock powder, coking carbon powder (coal gangue powder), caoline to mix up; adding in water; ageing the mixture; modeling by vacuum extrusion machine or brick press; dipping after drying; putting mixture in kiln vehicle and entering tunnel oven; getting phosphor vapour and carbon monoxide after preheating and heating-up; getting concentrated phosphoric acid through hydrated tower; getting carrying brick production through heat transferring and cooling. The invention uses the mine and ore dressing fag-end to prepar acid and brick. We can use the ore when the P2O5 is not smaller than 6%.

Description

technical field [0001] The invention relates to a method for preparing phosphoric acid and building bricks, in particular to a method using phosphoric acid containing 2 o 5 A method for directly producing high-concentration phosphoric acid and building bricks from ≥6% phosphate ore dressing tailings or low-grade phosphate rock. Background technique [0002] The industrial production methods of phosphoric acid mainly include the following: (1) Wet process phosphoric acid: use sulfuric acid to decompose phosphate rock to produce phosphoric acid. This method requires a large amount of high-quality phosphate rock and sulfuric acid, and produces a large amount of phosphogypsum waste residue. (2) Thermal phosphoric acid: Yellow phosphorus is produced by electric furnace method, and then burned and absorbed to produce phosphoric acid. This method requires a large amount of electric energy and medium and high-grade phosphate rock lump ore. (3) New kiln process: This process has no...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B18/12C01B25/18
CPCY02W30/91
Inventor 张定斌汤才洲
Owner HUBEI SANXIN PHOSPHORIC ACID
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