Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Method and device for preparing high-purity high-density magnesia by utilizing magnesite

A high-density, magnesite technology, applied in the field of comprehensive utilization of non-metallic resources, can solve the problems of environmental threats, high raw material cost and processing cost, strong corrosiveness, etc.

Inactive Publication Date: 2013-09-04
新疆蓝天镁业股份有限公司
View PDF4 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] 5) Hydrolysis method: direct use of high-temperature hydrolysis of bischofite to produce light magnesia, which is then washed and further calcined at high temperature to produce dead-burned magnesia. extremely demanding
[0013] Among them, the product produced by the chemical synthesis method has high purity, but due to the introduction of other chemicals, the cost of raw materials and treatment costs are much higher than that of the magnesite calcination method. Into the final magnesium oxide product, it will be discharged as waste, posing a threat to the environment, which is also one of the shortcomings of the chemical synthesis method

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 and device for preparing high-purity high-density magnesia by utilizing magnesite
  • Method and device for preparing high-purity high-density magnesia by utilizing magnesite
  • Method and device for preparing high-purity high-density magnesia by utilizing magnesite

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] Example 1: In a lightly burned powder calciner 1 using coal gas as a heat source, 50-120 mm massive magnesite (its composition includes: MgCO 3 82.38%, CaCO 3 8.81%, which is lower-grade magnesite) from the top of the furnace, and the high-temperature calcination temperature is 950~1100°C to obtain highly active lightly burned powder, of which the MgO content in lightly burned powder is 80%. Put the obtained lightly burned powder into the Raymond Mill 2 for crushing and grinding to obtain lightly burned powder with an average particle size of 200 mesh or more. Weigh 1000 kg of lightly burnt powder, add 3 m 3 In the water, the slurry is melted in the lightly burned pulverized slurry tank 3 to form a slurry with a solid content of 33%, which is added to the slurry metering tank 5 with the slurry pump 4 for metering. Then still use the lightly burned pulverized slurry tank 3 to dissolve 1700 kg of ammonium chloride to 8.5 m 3 In the water, a 200 g / L ammonium chloride ...

Embodiment 2

[0042] Example 2: The feed liquid after ammonia distillation is filtered through a centrifuge 8, wherein the water content of the filter cake after treatment is 30%, and the filter cake has a weight of 520 kg, wherein the filter cake contains MgO, CaCO 3 , MgCl 2 It is used as an excellent raw material for magnesium cement building materials. The liquid is mainly magnesium chloride solution with a concentration of 200 g / L and a volume of 7.4m 3 , into the magnesium chloride metering tank 11; after the gas coming out from the top of the ammonia rectification tower 13 enters into the ammonia rectification tower condenser 15 to condense, a part returns to the ammonia rectification tower as tower top reflux, and a part enters into the ammonia water metering Tank 16, in which the concentration of ammonia reaches 25%, has a volume of 3 m 3 (The amount of this part of ammonia is inconsistent with the amount of ammonia in the above-mentioned ammonia distillation tower because the re...

Embodiment 5

[0045] Embodiment 5: as attached figure 2 As shown, the device for preparing high-purity and high-density magnesite by using magnesite includes 1, light-burned powder calciner; 2, Raymond mill; 3, light-burned powder slurry tank; 4, slurry pump; 5, slurry 6. Ammonium chloride metering tank; 7. Ammonia still; 8. Centrifugal filter; 9. Ammonia stripper reboiler; 10. Ammonia stripper; 11. Stripper discharge pump; 12. Ammonia rectification tower reboiler; 13. Ammonia rectification tower; 14. Rectification tower discharge pump; 15. Ammonia rectification tower condenser; 16. Ammonia water metering tank; 17. Magnesium chloride metering tank; 18. Hydrogen Magnesium oxide preparation kettle; 19, belt vacuum filter; 20, slurry washing kettle; 21, centrifugal filter; 22, drying calciner; 23, ball press machine; 24, ultra-high temperature roasting kiln, and Light-burned powder calciner 1 is connected to the inlet of Raymond mill 2, and the outlet of Raymond mill 2 is connected to the in...

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 sizeaaaaaaaaaa
densityaaaaaaaaaa
Login to View More

Abstract

The invention relates to the technical field of comprehensive utilization of nonmetal resources, and provides a method and device for preparing high-purity high-density magnesia by utilizing magnesite. The method comprises the following steps of: calcining magnesite and pulverizing; introducing prepared light calcined powder slurry and an ammonium chloride solution treated by an ammonia distillation process to the ammonia stripping process for ammonia distillation; filtering the treated slurry, using the filter cake as a raw material for preparing magnesium cement, transferring filtrate and ammonia liquid from an ammonia rectification process to a magnesium hydroxide preparation process for treatment, and then filtering and washing; introducing filtered and washed liquid to the filter cake from the ammonia stripping process for slurry-forming treatment; and introducing a liquid product obtained after magnesium hydroxide preparation to the ammonia stripping process for ammonia stripping treatment, introducing a gas product obtained after treatment into the ammonia rectification process, and introducing a liquid product obtained after treatment to the ammonia distillation process. In the method provided by the invention, only ammonia chloride is circulated, the ammonia stripping technology and the ammonia rectification technology are simultaneously utilized, and no solid wastes are discharged, therefore, the method is a typical environmentally-friendly clean process.

Description

technical field [0001] The invention relates to the technical field of comprehensive utilization of non-metallic resources, and relates to a method and a device for preparing high-purity and high-density magnesite by utilizing magnesite. Background technique [0002] High-purity magnesia is a refractory material with excellent performance. The main component is periclase. Its melting point is as high as 2825°C. It has good high temperature resistance, corrosion resistance and thermal insulation properties. It is widely used in steel, cement, glass and other industries. Among them, The steel industry is its largest user, consuming 70% of the world's refractories. In recent years, the world's iron and steel and metallurgical industries have undergone tremendous development. The progress of smelting technology, especially the emergence of steelmaking furnace lining gunning technology, has put forward higher requirements for the quality of high-purity magnesia, forcing countries...

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 Patents(China)
IPC IPC(8): C04B2/10C01F5/20C01C1/12
Inventor 杨刚
Owner 新疆蓝天镁业股份有限公司
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

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

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com