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

Recovery of solid magnesium sulfate hydrate

A technology of magnesium sulfate and hydrate, which is applied in the direction of magnesium sulfate, process efficiency improvement, etc., and can solve problems such as waste of metals

Inactive Publication Date: 2009-02-04
BHP BILLITON SSM TECH PTY LTD
View PDF3 Cites 9 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When they are discarded as tailings, they not only waste valuable metals, but also create environmental problems

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
  • Recovery of solid magnesium sulfate hydrate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1-4

[0051] A stock solution containing 40 g / L of magnesium as magnesium sulfate was prepared. To 4 beakers, add this solution and 98% sulfuric acid as indicated in the table below to give a total volume of 250 mL of solutions containing nominally 100 g / L, 200 g / L, 300 g / L and 400 g / L of acid respectively.

[0052] Example number

[0053] 4

[0054] The solution was then cooled to -2°C and maintained at this temperature for 30 hours. The formed crystals were separated from the solution by filtration, dried in air and weighed to determine the hydrated MgSO 4 yield. The yields obtained from each solution were as follows:

[0055] Example number

[0056] XRF analysis of the crystals indicated that MgSO 4 The composition of the hydrate is MgSO 4 ·xH 2 O, where x is 5-7.

Embodiment 5

[0058] Magnesium sulfate hydrate (20 g), prepared as described in Example 2, was contacted with 98% sulfuric acid at 50° C. for 2 hours. The crystals were then separated from the acid by filtration using a glass fiber filter apparatus. Dilute the acid 20 times, take 5mL and titrate with 1M NaOH, you need 7.9mL titrant, which corresponds to an acidity of 1550g / L in the filtrate.

[0059] The crystals were then washed with ethanol and left at ambient temperature to allow excess ethanol to evaporate. The resulting solid was then analyzed by XRF and found to contain 14.3% Mg and 22.0% sulfur. This corresponds to the molecular formula MgSO 4 ·xH 2 O, where x = 1.8 (after correcting for residual H 2 SO 4 content).

Embodiment 6

[0061] Magnesium sulfate solution (40 g / L Mg) was mixed with ethanol and / or sulfuric acid in a constant total volume according to the conditions listed in the table below. The resulting solution was refrigerated at -3°C for at least 40 hours. The refrigerated samples were filtered and the crystalline material present was washed with ethanol, dried and weighed.

[0062] test

[0063] Increasing the concentration of ethanol caused an increase in magnesium precipitation. This is true whether sulfuric acid is present or not.

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

A process for recovering solid magnesium sulfate hydrate from a source of magnesium sulfate in solution said process includes the steps of: (a) providing a source of magnesium sulfate in solution that is derived from part of a process associated with the leaching of a metal containing ore or concentrate; (b) adding sulfuric acid to the magnesium sulfate solution to salt out the magnesium sulfate as magnesium sulfate hydrate crystals in a salting process, and partially diluting the sulfuric acid; (c) recycling the diluted sulfuric acid for use in the process of leaching the metal containing ore or concentrate; and (d) recovering the solid magnesium sulfate crystals.

Description

technical field [0001] The invention relates to a method for recovering solid magnesium sulfate hydrate. It is especially suitable for recovering crystallized solid magnesium sulfate hydrate from solutions containing magnesium sulfate. [0002] The method is particularly suitable for recovery of solid magnesium sulfate hydrate by processing magnesium sulfate solution recovered from brine solutions obtained during the recovery of metals from metal-containing ores or concentrates. It is particularly suitable for the treatment of magnesium sulphate recovered from brine solutions in nickel and cobalt recovery processes which utilize sulfuric acid to leach nickel and cobalt from nickel and cobalt containing ores. The method utilizes concentrated sulfuric acid to salt out solid magnesium sulfate in the form of crystals from a solution containing dissolved magnesium sulfate, and recovers the solid magnesium sulfate in the form of hydrate crystals. [0003] The solid magnesium sulfa...

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): C22B3/00C22B3/44C22B3/08C22B26/22
CPCC22B23/043C01F5/40C22B26/22C22B23/0461Y02P10/20C22B3/08C22B3/04
Inventor 埃里克·格万·罗奇杰奎琳·怀特黑德
Owner BHP BILLITON SSM TECH PTY LTD
Features
  • R&D
  • Intellectual Property
  • Life Sciences
  • Materials
  • Tech Scout
Why Patsnap Eureka
  • Unparalleled Data Quality
  • Higher Quality Content
  • 60% Fewer Hallucinations
Social media
Patsnap Eureka Blog
Learn More

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

© 2025 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com