Unlock instant, AI-driven research and patent intelligence for your innovation.

Method for preparing iron oxide red and cogenerating trisodium phosphate by ferro-phosphorus

A technology of trisodium phosphate and iron oxide red, which is applied in the fields of iron oxide, chemical instruments and methods, iron oxide/iron hydroxide, etc., and can solve the problem that iron oxide red cannot meet the requirements of oil absorption and relative tinting strength, and cannot form uniform powder , reduce the utilization rate of ferrophosphorus, and achieve the effects of low production cost, environmental protection and production cost reduction

Active Publication Date: 2009-04-29
SICHUAN UNIV +1
View PDF1 Cites 7 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although this invention patent has obtained the trisodium phosphate product with ferrophosphorus, the technical process is to wet the mixture of ferrophosphorus and sodium carbonate with 10% to 15% of 1 to 5 ° Be' sodium phosphate solution at 1000 to 1100 ℃ for high-temperature roasting, which will lead to increased energy consumption due to the evaporation of a large amount of water
Roasting the reaction mixture at high temperature under wet conditions will produce iron phosphate by-products with a small particle size, forming a layer of dense wrappings on the surface of the unreacted ferro-phosphorus, resulting in incomplete reaction and reducing the utilization rate of ferro-phosphorus
Direct high-temperature roasting under wet conditions will cause sintering of the roasted material and cannot form a uniform powder. If the filter cake obtained by this method is used to prepare iron oxide red, it will not be able to meet the national standard for the oil absorption of iron oxide red. and relative tinting strength requirements
Furthermore, the filter cake iron oxide obtained by this method is black, which cannot meet the national standard for iron oxide red color requirements - reddish brown
Therefore, the filter cake obtained by this method can only be discarded as waste residue, and this patent only utilizes the phosphorus element in ferrophosphorus, but does not utilize the iron element with higher added value

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Method for preparing iron oxide red and cogenerating trisodium phosphate by ferro-phosphorus
  • Method for preparing iron oxide red and cogenerating trisodium phosphate by ferro-phosphorus
  • Method for preparing iron oxide red and cogenerating trisodium phosphate by ferro-phosphorus

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] In the present embodiment, the phosphorus content of ferrophosphorus used is 26.8% (mass percentage), and the processing step of preparing iron oxide red co-production trisodium phosphate is as follows:

[0039] (1) Preparation and handling of raw materials

[0040] Using ferrophosphorus powder and sodium carbonate as raw materials, the particle size of ferrophosphorus powder is 53 μm to 62 μm, which accounts for more than 99%. 3.01) Ingredients, mix them evenly, then dry in an oven at normal pressure and 100°C for 40 minutes, so that the mass percentage of moisture contained in the mixed powder of ferrophosphorus and sodium carbonate can be ≤0.1%;

[0041] (2) Low temperature roasting

[0042] Roast the mixed powder of ferrophosphorus and sodium carbonate after step (1) drying at 450°C for 4 hours, then cool to room temperature, and absorb the P produced in the roasting with tap water at the initial stage of process start-up. 2 o 5 Gas, after the circulation of the ...

Embodiment 2

[0052] In the present embodiment, the phosphorus content of ferrophosphorus used is 26.8% (mass percentage), and the processing step of preparing iron oxide red co-production trisodium phosphate is as follows:

[0053] (1) Preparation and handling of raw materials

[0054] Ferrophosphorus powder and sodium carbonate are used as raw materials, and the particle size of ferrophosphorus powder is 45 μm to 53 μm, which accounts for more than 99%. 3.16) Ingredients, mix them evenly, and then dry them in an oven at normal pressure and 200°C for 20 minutes, so that the mass percentage of water contained in the mixed powder of ferrophosphorus and sodium carbonate can be ≤0.1%;

[0055] (2) Low temperature roasting

[0056] The mixed powder of ferrophosphorus and sodium carbonate after drying in step (1) was roasted at 650°C for 2 hours, then cooled to room temperature, and tap water was used to absorb the P produced in the roasting at the initial stage of the flow process. 2 o 5 Gas...

Embodiment 3

[0066] In the present embodiment, the phosphorus content of ferrophosphorus used is 26.8% (mass percentage), and the processing step of preparing iron oxide red co-production trisodium phosphate is as follows:

[0067] (1) Preparation and handling of raw materials

[0068] Ferrophosphorus powder and sodium carbonate are used as raw materials, and the particle size of ferrophosphorus powder is 38 μm to 45 μm, accounting for more than 99%. 3.10) Ingredients, mix them evenly, and then dry them in an oven at normal pressure and 150°C for 30 minutes, so that the mass percentage of water contained in the mixed powder of ferrophosphorus and sodium carbonate can be ≤0.1%;

[0069] (2) Low temperature roasting

[0070] Roast the mixed powder of ferrophosphorus and sodium carbonate after drying in step (1) at 550°C for 3 hours, then cool to room temperature, and use tap water to absorb the P produced in the roasting at the beginning of the flow process. 2 o 5 Gas, after the cycle of ...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
particle diameteraaaaaaaaaa
Login to View More

Abstract

The invention discloses a method for preparing iron oxide red co-produced with trisodium phosphate by ferrophosphorus, which comprises the steps of: (1) adopting ferrophosphorus powder and sodium carbonate as the raw material, mixing uniformly and drying; (2) roasting the mixed powder in the step (1) at the temperature of 450-650 DEG C for at least 2 hours, absorbing P2O5 gas generated during roasting by the wash water of a washing filter cake to form the sodium phosphate solution; (3) roasting the material roasted at low temperature in step (2) at the temperature of 700-850 DEG C for 1-4 hours, and absorbing the P2O5 gas generated during roasting by the wash water of a washing filter cake to form the sodium phosphate solution; (4) leaching the material of the step (3) at the temperature of 80-90 DEG C for at least 1 hour, and filtering to obtain the filter cake and the filtrate; (5) washing the filter cake with water and drying to obtain the finished product of the iron oxide red; and (6) mixing the sodium phosphate solution obtained from step (2) and step (3) and the filtrate obtained from step (4) to obtain trisodium phosphate solution, condensing, crystallizing and drying to obtain the finished product of the trisodium phosphate.

Description

technical field [0001] The invention belongs to a production method of iron oxide red, in particular to a method for preparing dry-process iron oxide red and co-producing trisodium phosphate by utilizing iron phosphorus waste residue. Background technique [0002] Due to its unique corrosion resistance, iron oxide red is widely used in various fields of paint, construction, rubber, plastic and other industries. The industrial production process of iron oxide red is generally divided into two types: dry method and wet method. The wet process is the acid-soluble oxidation method, which uses scrap iron as raw material, acidifies it with hydrochloric acid, sulfuric acid, and nitric acid, adds seed crystals, and then oxidizes it in two steps. The product performance of this method is better, but the strong acid is very corrosive and requires high equipment, and the key of the wet process is the preparation of seed crystals, the process is complex, the production cycle is long, a...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Applications(China)
IPC IPC(8): C01G49/06C01B25/30
Inventor 李军张海燕王邵东金钢陈锐邓任军任永胜王涛杨光明
Owner SICHUAN UNIV