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

Method for refining sodium sulfate powder from chromium-containing mirabilite

A technology of Glauber's salt and Yuanming powder, applied in chemical instruments and methods, alkali metal sulfites/sulfites, alkali metal compounds, etc., can solve problems such as failure to realize industrialized production, limited application, difficult transportation, etc.

Active Publication Date: 2014-01-29
SICHUAN YINHE CHEM
View PDF9 Cites 11 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since the by-product Glauber's salt contains a small amount of hexavalent chromium, its application is limited
In the past, some people tried to dissolve Glauber's salt to remove chromium and evaporate it to make Yuanming powder. Because the cost is higher than that of products made from natural Glauber's salt, industrial production has not been realized.
At present, the processing methods of chromium-containing Glauber's salt in my country's chromium salt factory generally include three types: first, high-temperature carbon reduction to produce soda sulfide, which has problems or hidden dangers such as high energy consumption, difficult transportation, or secondary pollution to other environments; Second, it is used to produce chromium powder, but the amount is small; third, it is used to produce sodium bisulfate, because it contains a small amount of chromium, it can only produce low-end products, which limits its application

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

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0056] Step 1: 500 kg of chromium-containing Glauber's salt with a sodium sulfate content of 80.00 wt %, a hexavalent chromium content (calculated as sodium peruminum) of 0.05 wt % and a water content of 19.50 wt % from the process of preparing sodium peruminate by sulfuric acid method is wet-ground in the presence of water Slurry, the particle size control after wet milling is more than 120 orders, obtains the aqueous slurry of 650 g / liter. Use 98wt% sulfuric acid to adjust the aqueous slurry to pH = 2.5, then add 0.23 kg of sodium sulfite for reduction to obtain a supersaturated aqueous solution of sodium sulfate. Then the reaction mixture was naturally cooled to room temperature at a stirring rate of 45 rpm, during which crystals were continuously precipitated.

[0057] The crystals were then filtered out using a vacuum belt filter, which were referred to as primary crystals. This crystal is washed with the saturated aqueous solution newly prepared by sodium sulfate and wa...

Embodiment 2

[0061] Step 1: 500 kg of chromium-containing Glauber's salt with a sodium sulfate content of 80.00 wt %, a hexavalent chromium content (calculated as sodium peruminum) of 0.05 wt % and a water content of 19.50 wt % from the process of preparing sodium peruminate by sulfuric acid method is wet-ground in the presence of water Slurry, the particle size control after wet milling is more than 120 orders, obtains the aqueous slurry of 650 g / liter. Use 98wt% sulfuric acid to adjust the aqueous slurry to pH = 1.0, then add 0.35 kg of sodium sulfite for reduction to obtain a supersaturated aqueous solution of sodium sulfate. Then the reaction mixture was naturally cooled to room temperature at a stirring rate of 45 rpm, during which crystals were continuously precipitated.

[0062] The crystals were then filtered out using a vacuum belt filter, which were referred to as primary crystals. This crystal is washed with the saturated aqueous solution newly prepared by sodium sulfate and wa...

Embodiment 3

[0066]Step 1: 500 kg of chromium-containing Glauber's salt with a sodium sulfate content of 80.00 wt %, a hexavalent chromium content (calculated as sodium peruminum) of 0.05 wt % and a water content of 19.50 wt % from the process of preparing sodium peruminate by sulfuric acid method is wet-ground in the presence of water Slurry, the particle size control after wet milling is more than 120 orders, obtains the aqueous slurry of 650 g / liter. Use 98wt% sulfuric acid to adjust the aqueous slurry to pH = 2.0, then add 0.32 kg of sodium sulfite for reduction to obtain a supersaturated aqueous solution of sodium sulfate. Then the reaction mixture was naturally cooled to room temperature at a stirring rate of 45 rpm, during which crystals were continuously precipitated.

[0067] The crystals were then filtered out using a vacuum belt filter, which were referred to as primary crystals. This crystal is washed with the saturated aqueous solution newly prepared by sodium sulfate and wat...

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 relates to a method for refining sodium sulfate powder from chromium-containing mirabilite. The method comprises the following steps: a) grinding the chromium-containing mirabilite in the presence of water to prepare water-containing slurry; b) regulating the pH of the water-containing slurry obtained in the step a) with sulfuric acid to 2-3, and then adding sodium sulfite to reduce hexavalent chromium in the water-containing slurry to trivalent chromium, thus obtaining a saturated or over-saturated sodium sulfate water solution; c) stirring and crystallizing the saturated or over-saturated water solution which is obtained after reduction in the step b); d) filtering out crystals obtained in the step c); e) washing the crystals obtained in the step d) with the saturated sodium sulfate water solution; f) re-crystallizing the washed crystals obtained in the step e) with a saturated neutral sodium sulfate water solution to obtain the sodium sulfate powder. According to the method provided by the invention, additional heating is not required, the energy consumption is low, the obtained sodium sulfate powder has high yield and high purity, the content of sodium sulfate can achieve 99.00-99.90wt%, and the chromium content does not exceed 5ppm.

Description

technical field [0001] The present invention relates to a kind of method of refining Yuanming powder by chromium-containing Glauber's salt, more specifically, relate to a kind of method that utilizes chromium-containing Glauber's salt to refine Yuanming powder under low-temperature saturated or supersaturated solution state (hereinafter sometimes also referred to as "YH "Law). Background technique [0002] The production scale of my country's sodium sulfate ranks first in the world. The raw materials mainly include salt lake mirabilite, seawater sun-dried mirabilite, mirabilite ore and industrial by-products. The current production methods mainly include four-effect vacuum evaporation of nitric acid, secondary steam waste heat nitric acid production method, Five-effect vacuum evaporation production method, full-solubility evaporation dehydration production method, etc. These production processes are made into finished products through processes such as raw material dissoluti...

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
IPC IPC(8): C01D5/00
Inventor 李先荣马顺友白礼太胡义华
Owner SICHUAN YINHE CHEM
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