Pretreatment method in the process of preparing titanium dioxide by reusing acidolysis residues

A technology of acidolysis slag and titanium dioxide, which is applied to chemical instruments and methods, titanium compounds, titanium dioxide, etc., can solve the problems of fast reaction speed, reduced acidolysis rate, large investment and cost, etc., and achieves improved recovery rate and reduced stacking The effect of slag

Inactive Publication Date: 2012-02-01
SICHUAN LOMON TITANIUM IND CO LTD
View PDF6 Cites 24 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The predecessors have the following disadvantages in the utilization of acid hydrolysis waste residue: firstly, the waste residue is treated by mineral processing, which is too large in investment and cost; secondly, it is difficult to decompose it under normal acid hydrolysis conditions. The acid concentration can only be carried out, which increases the cost of acid hydrolysis; third, the sedimentation of titanium dioxide obtained by acid hydrolysis is difficult, the quality is poor, and it is not suitable for the production of high-end titanium dioxide
[0006] In the process of producing titanium dioxide by sulfuric acid method, the ratio of acid to mineral is the key parameter to determine the strength and degree of acidolysis reaction. The speed is fast and the reaction is violent. Generally, the acid ore ratio of acid hydrolysis of titanium concentrate is controlled at 1.5-1.7. If the acid ore ratio is high or low, it is easy to cause insufficient heat release or excessive heat release beyond the appropriate reaction temperature range, reducing acidolysis. Rate

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
  • Pretreatment method in the process of preparing titanium dioxide by reusing acidolysis residues
  • Pretreatment method in the process of preparing titanium dioxide by reusing acidolysis residues
  • Pretreatment method in the process of preparing titanium dioxide by reusing acidolysis residues

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] According to the total acid ore ratio of 0.6 and the reaction acid concentration of 60%, first put 792 grams of concentrated waste acid with a mass fraction of 50% into a 5000mL beaker, add 1000g of dry acid hydrolysis slag particles while stirring, and keep stirring after 10 minutes Add 208 grams of 98% concentrated sulfuric acid, then heat the material to boiling, control the heating rate, so that the acidolysis is in a slightly boiling state, the reaction temperature is 130-140 ° C, the reaction time is about 35 minutes to form a solid phase mixture, stop heating and the reaction is over , put the obtained solid-phase mixture at 160°C for 2 hours, add 1500mL of water for leaching, maintain the leaching temperature at 70°C, add 12g of iron powder after leaching for 2.5h and continue leaching for 1.5h to obtain about 3000g of acid solution , the acid hydrolysis results are shown in Table 2.

[0035] Get 3000g of the acidolysis solution obtained in Comparative Example 1...

Embodiment 2

[0038] According to the total acid ore ratio of 0.7 and the reaction acid concentration of 70%, first put 583 grams of concentrated waste acid with a mass fraction of 50% into a 5000mL beaker, add 1000g of dry acid hydrolysis slag particles while stirring, and keep stirring after 10 minutes Add 417 grams of 98% concentrated sulfuric acid, then heat the material to boiling, control the heating speed, make the acidolysis proceed in a slightly boiling state, keep the reaction temperature at about 140-150°C, and the reaction time is about 30 minutes to form a solid phase mixture, stop After the heating reaction is over, the obtained solid phase mixture is aged at 160°C for 2 hours, then add 1500mL of water for leaching, maintain the leaching temperature at 70°C, add 12g of iron powder after leaching for 2.5h and continue leaching for 1.5h to obtain acid The solution solution is about 3000g, and the acid hydrolysis results are shown in Table 2.

[0039] Get the acid solution soluti...

Embodiment 3

[0042] According to the total acid ore ratio of 0.7 and the reaction acid concentration of 80%, first put 328 grams of concentrated waste acid with a mass fraction of 50% into a 5000mL beaker, add 1000g of dry acid hydrolysis slag particles while stirring, and keep stirring after 10 minutes Add 547 grams of 98% concentrated sulfuric acid, then heat the material to boiling, control the heating rate, so that the acidolysis is carried out in a slightly boiling state, the temperature should be 150-160 ° C, the reaction time is about 25 minutes to form a solid phase mixture, and stop the heating reaction At the end, put the obtained solid-phase mixture at 160°C for 2 hours, add 1500mL of water for leaching, maintain the leaching temperature at 70°C, add 12g of iron powder after leaching for 2.5h and continue leaching for 1.5h to obtain acidolysis solution About 3000g, the results of acid hydrolysis are shown in Table 2.

[0043] Get the acid solution 5000g obtained in comparative e...

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
concentrationaaaaaaaaaa
particle sizeaaaaaaaaaa
quality scoreaaaaaaaaaa
Login to view more

Abstract

The invention discloses a pretreatment method in the process of preparing titanium dioxide by reusing titanium dioxide acidolysis residues, which comprises the following steps of: crushing dried acidolysis residues, mixing raw materials by an acid mine, raising the temperature for acidolysis reaction; carrying out maturation reaction to generate solid-phase mixture; watering and leaching; mixing and settling; and obtaining a required product. With the adoption of the technical scheme, the pretreatment method has the beneficial effects that the reuse of the acidolysis residues as well as waste acid in the production process of the titanium dioxide can be better realized, so that the acidolysis rate of the titanium dioxide contained in the acidolysis residues reaches above 80 percent; the product obtained by pretreatment can be directly used for a sulfuric acid process to prepare the titanium dioxide, so that the recovery ratio of titanium is improved above 3 percent, a vast majority of titanium elements in the acidolysis residues are effectively recovered, and more than 30 percent of residue piling amount is reduced. The pretreatment method changes wastes into valuables and has important significance on effective utilization of resources and environment protection.

Description

technical field [0001] The invention relates to a method for reusing acidolysis waste residue in the titanium dioxide production process, in particular to a method for pretreatment of the acidolysis residue when titanium dioxide is prepared from the acidolysis waste residue in the titanium dioxide production process. Background technique [0002] Titanium dioxide scientific name titanium dioxide (TiO 2 ), is an important white pigment, widely used in plastics, paper, printing ink, chemical fiber, rubber, cosmetics and other fields. Its production methods are mainly sulfuric acid method and chlorination method. Due to the source of raw materials and technical reasons, most of the more than 60 titanium dioxide production plants in my country use the sulfuric acid process. The sulfuric acid method is to carry out acidolysis reaction of titanium concentrate and concentrated sulfuric acid to generate titanyl sulfate, and then hydrolyze to generate metatitanic acid. After removi...

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): C01G23/047B09B3/00
CPCC01P2006/62C01P2006/63C09C1/3607C01G23/0532C01P2006/64C22B34/12C09C1/3623Y02P10/20
Inventor 蔡平雄常键邓伯松朱全芳王国锋
Owner SICHUAN LOMON TITANIUM IND CO LTD
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap