Extraction technology of alumina and potassium sulfate from alunite by using hot-pressing leaching process

Active Publication Date: 2010-12-15
ZIJIN MINING GROUP
View PDF4 Cites 14 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In this method, the corrosion resistance of equipment materials has not been well solved in production, and it is difficult to remove iron in aluminum salt solution. The amount of acid is large and the acid radicals are not easy to recover.
The main disadvantage of this method is that the generation of harmful flue gas is not friendly to the environment, and the utilization rate of potassium and aluminum is not high.
[0009] From the above, it can be seen that the current treatment methods of alunite ore have problems such as high cost, serious pollution, and utilization 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
  • Extraction technology of alumina and potassium sulfate from alunite by using hot-pressing leaching process
  • Extraction technology of alumina and potassium sulfate from alunite by using hot-pressing leaching process
  • Extraction technology of alumina and potassium sulfate from alunite by using hot-pressing leaching process

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] The present embodiment proposes a method for producing alumina and potassium sulfate by treating alunite with a hot-pressing leaching process with low production cost, short technological process, environmental friendliness, and easy industrial implementation. The method overcomes the disadvantages of high roasting energy consumption, complex process flow, difficult operation, serious environmental pollution and the like in the prior art of alumite treatment.

[0028] In this example, the alunite was leached by hot pressing with potassium hydroxide solution. The leaching slurry is filtered and separated to precipitate aluminum hydroxide with sulfuric acid, the aluminum hydroxide separated by filtration is calcined to obtain finished alumina, and the mother liquor is evaporated, concentrated and crystallized to obtain finished potassium sulfate. It includes the following steps:

[0029] The first step: add alunite and potassium hydroxide solution into the slurry mixing ...

Embodiment 2

[0044] Take 96.4 g of alunite and 5% potassium hydroxide solution to carry out hot pressing leaching under the conditions of liquid-solid ratio of 3, temperature of 140 ° C, and time of 45 min, and filtration to achieve solid-liquid separation to obtain aluminum-containing potassium mother liquor. The dissolution rates of alumina and potassium oxide in this process were 78.25% and 90.69%, respectively.

[0045] After the mother liquor containing aluminum and potassium is desiliconized, the desiliconized semen with a silicon content index greater than 300 is obtained, and sulfuric acid is added to precipitate aluminum hydroxide (the amount of sulfuric acid added is to prevent the precipitated aluminum hydroxide from returning to dissolve), and 1.5 times the volume of the filtrate is heated. The aluminum hydroxide obtained by washing with water, filtering and drying was calcined at 1100°C to obtain primary alumina. The lotion is sent to the hot pressing system for recycling.

...

Embodiment 3

[0048] Take 130 g of alunite and 7% potassium hydroxide solution to carry out hot-press leaching under the conditions of liquid-solid ratio of 3, temperature of 150 ° C, and time of 1 h, and filtration to achieve solid-liquid separation to obtain aluminum-containing potassium mother liquor.

[0049] The mother liquor containing aluminum and potassium is subjected to desiliconization, acid precipitation of aluminum hydroxide and crystallization of precipitation aluminum mother liquor according to the conditions of Example 1 to obtain potassium sulfate product after evaporation, concentration and crystallization. The technical indicators are shown in Table 1 below.

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

No PUM Login to view more

Abstract

The invention discloses an extraction technology of alumina and potassium sulfate from alunite by using a hot-pressing leaching process, comprising the following steps: mixing the alunite with a potassium hydroxide solution to prepare pulp; transferring the pulp into a hot-pressing system, carrying out hot-pressing leaching at 100-300 DEG C, cooling the obtained leaching solution, and carrying out solid-liquid separation; transferring the leaching solution after solid-liquid separation into a desiliconization system for desiliconizing at 80-200 DEG C, and filtering and separating to obtain a desiliconized extracting solution and silica slag; transferring the desiliconized extracting solution into an acid regulating system, keeping adding sulfuric acid to the acid regulating system while stirring until white precipitate in the desiliconized extracting solution is not generated any more and disappears, and then filtering and separating out a solution mainly containing the potassium sulfate; transferring the solution mainly containing the potassium sulfate into a crystallization system, evaporating and crystallizing the solution mainly containing the potassium sulfate in the crystallization system, and filtering and separating to obtain potassium sulfate crystal. The extraction technology of the invention has lower production cost and relatively short process flow.

Description

technical field [0001] The present invention relates to a method for treating alunite, in particular to the extraction of alumina and potassium sulfate from alunite using a hot-pressing leaching process. Background technique [0002] Alumite refers to sulfate-type potassium alumite. At present, most of the development of alumite at home and abroad focuses on the extraction of aluminum, potassium and sulfur. The more typical methods mainly include reduction pyrolysis method, ammonia alkali method, Calenitic acid method, U·G method, ammonium sulfate decomposition method, thermal decomposition method, etc. In addition, there are potassium chloride sintering method, sulfated roasting method, acid ammonia method, hydration method, etc. [0003] Reduction pyrolysis is a method of reducing after calcination of alunite. First, exclude SO from aluminum sulfate 3 , and then treat the reduced alumite ore with lye. The method has the disadvantages of serious environmental pollution...

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): C01F7/06C01D5/00
Inventor 阮仁满谭希发衷水平伍赠玲刘晓英
Owner ZIJIN MINING GROUP
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