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Direct phosphate rock reducing process for preparing high concentration phosphoric acid and coproducing silicate and aluminate products

A high-concentration, aluminate technology, applied in phosphoric acid, phosphorus oxyacids, cement production, etc., can solve the problems of increased production costs, phosphorus utilization rate is only about 80%, complex production process control, etc., to improve the reduction rate Effect

Inactive Publication Date: 2007-08-22
HUBEI SANXIN PHOSPHORIC ACID
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

(3) New kiln phosphoric acid process: this process has not been successfully applied in the production, but there are reports in the patented method, such as: the patent number of Changsha Institute of Mining and Metallurgy in China is 93111447.0 "a method of directly reducing phosphate rock to produce phosphoric acid The invention patent of "Method" requires medium-grade phosphate rock, and the utilization rate of phosphorus is only about 80%. Medium-grade phosphate rock is also required
There are 1-3 dipping processes in this patent application, the production process control is relatively complicated, and the dipping process also increases the production cost

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0022] Use Hubei Shennongjia Mining Company's phosphate ore dressing tailings, silica powder, and coke powder according to the following mass ratios respectively: (1) tailings: silica powder=1: 0.1, P 2 o 5 %: C = 1: 0.3; (2) tailings: silica powder = 1: 0.5, P 2 o 5 %: C = 1: 0.5; (3) tailings: silica powder = 1: 1, P 2 o 5 %: C = 1: 0.8; (4) tailings: silica powder = 1: 1.8, P 2 o 5 %:C=1:1 Mix well, the fineness of the mixture should be ≥120 mesh; after mixing well, add about 8% water evenly in the ball forming tray to make the material into Φ5-50mm small balls, and then put it into 610×610× The 450mm square silicon carbide material container is loaded into a 1.5×1.5M kiln car. After drying, it enters a 36.98×1.9×1.5M tunnel kiln. After preheating, the temperature rises to 1200-1450°C. The running time is 8 hours, and the running process is automatically controlled by PLC programming. The high-temperature gas is pumped into the Φ1.4×8.2M hydration tower and absorbed ...

example 2

[0024] Use the mixture in Example 1 plus 2% kaolin mud, add about 6% water evenly, mix well, and press it into 230×112×65mm bricks or 240×60×8mm bricks with a 160-ton friction press, and install them after drying Put it into a 610×610×450mm square phosphate refractory material container, put it into a 1.5×1.5M kiln car, and enter a 36.98×1.9×1.5M tunnel kiln. After preheating, the temperature is raised to 1200-1400℃, and the material container is always running in the kiln. The time is 16 hours, and its operation process is automatically controlled by PLC programming. The high-temperature gas is pumped into the Φ1.4×8.2M hydration tower and absorbed by circulating acid to obtain phosphoric acid. After testing, the concentration of phosphoric acid is 85%. The bricks in the material container are cooled and exchanged to obtain 230×112×65mm refractory insulation brick or 240×60×8mm decorative brick products, P in the finished product 2 o 5 ≤0.7%, the product meets the quality r...

example 3

[0026]Use the mixture in Example 1, then add 1-2% water glass or polyvinyl alcohol or methyl cellulose of the total weight of the material, evenly add 6-8% water and mix well, then press it with a friction press to form an outer surface that meets the national standards. Wall bricks or other pre-designed special-shaped building materials, after drying, put them into a 610×610×450mm square phosphate refractory material container, put them into a 1.5*1.5M kiln car, and enter a 36.98×1.9×1.5M tunnel kiln after pre-processing Heat up the temperature to 1200-1400°C, and the total running time of the material container in the kiln is 12 hours, and the running process is automatically controlled by PLC programming. The high-temperature gas is pumped into the Φ1.4×8.2M hydration tower and absorbed by circulating acid to obtain phosphoric acid. The concentration of phosphoric acid is 85%. The material container product is cooled and heat-exchanged to obtain exterior wall bricks or desig...

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PUM

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Abstract

The present invention discloses direct phosphate rock reducing process for preparing high concentration phosphoric acid and coproducing silicate and aluminate products, and may be used in the comprehensive utilization of medium and low grade phosphate rock and phosphate rock tailings with P2O5 content not less than 6 %. The direct phosphate rock reducing process includes mixing phosphate rock powder with silica powder, coke powder, coal powder, kaolin or other additive and water; shaping the mixture and stoving; setting into container of refractory material and heating in a tunnel kiln to obtain phosphorus vapor and CO; absorbing in a hydrating tower to obtain concentrated phosphoric acid and cooling the product inside the container to obtain various kinds of side product. The present invention has simple production process and raised phosphorus reducing rate, and is suitable for industrial production.

Description

technical field [0001] The invention relates to a method for preparing phosphoric acid and various silicon and aluminate products, especially a method for preparing phosphoric acid containing P 2 o 5 A method for directly producing high-concentration phosphoric acid and various silicon and aluminate products from ≥6% medium and low-grade phosphate rock and tailings after phosphate rock beneficiation. 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...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B25/18C04B7/24
CPCY02P40/10
Inventor 张定斌汤才洲
Owner HUBEI SANXIN PHOSPHORIC ACID
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