Method for preparing high-purity iron oxide and trisodium phosphate by ferro-phosphorus alkalization process

A technology of trisodium phosphate and iron oxide, applied in chemical instruments and methods, iron oxide, iron oxide/iron hydroxide and other directions, can solve the problems of low added value of iron oxide red pigment, long roasting time, high energy consumption, etc. Achieve the effect of high added value, high comprehensive utilization rate and simple production process

Inactive Publication Date: 2010-07-14
WUHAN INSTITUTE OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although this invention patent proposes to use both iron and phosphorus in ferrophosphorus, the process uses secondary roasting, and the roasting time at medium and high temperatures is long, the energy consumption is large, and the resulting P 2 o 5 There is a lot of gas, which needs to be absorbed by washing water, and the added value of the product iron oxide red pigment is low

Method used

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  • Method for preparing high-purity iron oxide and trisodium phosphate by ferro-phosphorus alkalization process
  • Method for preparing high-purity iron oxide and trisodium phosphate by ferro-phosphorus alkalization process

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Embodiment 1

[0038] In the present embodiment, the iron element mass percentage composition is 62.6% in the phosphorus iron, and the phosphorus element content mass percentage composition is 23.8%: prepare high-purity iron oxide and trisodium phosphate technological process according to Figure 1 phosphorus iron alkalization process:

[0039] 1) Roasting

[0040] Ferrophosphorus is pulverized and passed through a 100-mesh sieve, with a particle size of 150 μm accounting for more than 98%, mixed evenly with soda ash at a mass ratio of 1:1.1, aerobically roasted at 700°C for 3 hours, and cooled to room temperature;

[0041] 2) Water immersion and filtration

[0042] After cooling the roasted product obtained in step 1) to room temperature, add 60° C. hot water for immersion according to the mass ratio of the roasted product and water for immersion of 1:6.5, and filter after 4 hours of water immersion to obtain a filtrate and a filter cake;

[0043] 3) Acid hydrolysis

[0044] The filter cak...

Embodiment 2

[0056] In the present embodiment, the iron element mass percentage in the phosphorus iron is 62.6%, and the phosphorus element content mass percentage is 23.8%:

[0057] 1) Roasting

[0058] Ferrophosphorus is pulverized and passed through a 120-mesh sieve, with a particle size of 125 μm reaching more than 98%, mixed evenly with soda ash in a mass ratio of 1:1.2, aerobically roasted at 750°C for 3 hours, and cooled to room temperature;

[0059] 2) Water immersion and filtration

[0060] After cooling the roasted product obtained in step 1) to room temperature, add 70° C. hot water for immersion according to the mass ratio of the roasted product and water for immersion of 1:7, and filter after 4 hours of water immersion to obtain a filtrate and a filter cake;

[0061] 3) Acid hydrolysis

[0062] With the filter cake obtained in step 2) under stirring, slowly add sulfuric acid with a mass concentration of 70% according to the mass ratio of the filter cake and sulfuric acid at ...

Embodiment 3

[0074] In the present embodiment, the iron element mass percentage in the phosphorus iron is 62.6%, and the phosphorus element content mass percentage is 23.8%:

[0075] 1) Roasting

[0076] Ferrophosphorus is pulverized and passed through a 200-mesh sieve, with a particle size of 75 μm reaching more than 98%, mixed evenly with soda ash at a mass ratio of 1:1.2, aerobically roasted at 800°C for 2 hours, and cooled to room temperature;

[0077] 2) Water immersion and filtration

[0078] After cooling the roasted product obtained in step 1) to room temperature, add 75° C. hot water for immersion according to the mass ratio of the roasted product and water for immersion of 1:7.5, and filter after 2 hours of water immersion to obtain a filtrate and a filter cake;

[0079] 3) Acid hydrolysis

[0080] With the filter cake obtained in step 2) under stirring, slowly add sulfuric acid with a mass concentration of 85% according to the mass ratio of the filter cake to sulfuric acid of ...

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Abstract

The invention relates to a method for preparing high-purity iron oxide and trisodium phosphate by a ferro-phosphorus alkalization process, which comprises the following steps of: mixing ferro-phosphorus slag with calcined soda and then roasting the mixture; performing water immersion on a roasted product, and using filter residues obtained after the water immersion to prepare the high-purity iron oxide; and using the filtrate obtained after the water immersion of the roasted product to prepare the trisodium phosphate. The process provided by the invention can fully utilize the iron and phosphorus elements in ferro-phosphorus at the same time, and has a certain value in energy-saving and emission-reduction; the comprehensive utilization ratio of the ferro-phosphorus is high, the conversion rate of the iron element can reach 91.3 to 93.2, the conversion rate of the phosphorus element can reach 89.8 to 91.1 percent, the product added value is high, the prepared high-purity iron oxide accords with a national standard HG/T 2574-94, the iron trioxide content can reach 98.8 to 99.4 percent; and compared with the existing common method for producing high-purity industrial iron oxide, the method for preparing the high-purity iron oxide and the trisodium phosphate by the ferro-phosphorus alkalization process greatly reduces the production cost, has a simple production process and non-demanding conditions, and is easy to implement.

Description

technical field [0001] The invention belongs to the field of comprehensive utilization of iron-phosphorus by-products produced by thermal phosphoric acid and phosphate fertilizer, and in particular relates to a method for preparing high-purity iron oxide and trisodium phosphate through an alkalization process of iron-phosphorus. Background technique [0002] High-purity iron oxide (ferric oxide) is an important chemical product, mainly used as raw materials for soft ferrite, hard ferrite, polishing paste and other industries. At present, the production of ferric oxide mainly includes dry method and wet method. The dry process includes green vitriol calcination method, iron yellow calcination method, ferrous sulfate-soda ash calcination method, the route is short, but the energy consumption is large and the reaction conditions are harsh. Wet process includes sulfate method, nitrate method and mixed salt method. The main process of this method is: put the seed crystal into t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G49/06C01B25/30
Inventor 张莉丁一刚戢峻杨昌炎陈虎
Owner WUHAN INSTITUTE OF TECHNOLOGY
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