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

A method for producing light calcium carbonate and magnesium sulfate heptahydrate from salt mud

A technology of light calcium carbonate and magnesium sulfate heptahydrate, applied in the direction of magnesium sulfate, chemical instruments and methods, calcium carbonate/strontium/barium, etc., can solve the problems of high cost of hydrochloric acid and sodium hydroxide, low solubility of magnesium bicarbonate, and water volume and high energy consumption of pyrolysis, to achieve the effect of accelerating the carbonization reaction rate, low equipment requirements, and reducing water consumption

Active Publication Date: 2021-03-26
HEBEI UNIVERSITY OF SCIENCE AND TECHNOLOGY
View PDF4 Cites 2 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Patent CN102040250A proposes to dissolve the salt mud with hydrochloric acid and then continuously adjust the pH by acid and alkali to precipitate various metal ions step by step, filter in turn and obtain corresponding metal compounds through subsequent treatment to extract various metal elements in the salt mud. Consumption of hydrochloric acid and sodium hydroxide is costly and cumbersome
Chinese patent CN101823738 proposes a method for producing light magnesium carbonate and co-producing fine calcium carbonate and water glass with chlor-alkali mud. This method mainly realizes the separation of calcium and magnesium by generating slightly soluble magnesium bicarbonate and calcium carbonate precipitation, but due to the The solubility of magnesium hydrogen is small, resulting in very large water consumption and pyrolysis energy consumption in this 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
  • A method for producing light calcium carbonate and magnesium sulfate heptahydrate from salt mud
  • A method for producing light calcium carbonate and magnesium sulfate heptahydrate from salt mud
  • A method for producing light calcium carbonate and magnesium sulfate heptahydrate from salt mud

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] A kind of salt mud produces the method for light calcium carbonate and magnesium sulfate heptahydrate, comprises the following steps:

[0045] Step A: Add calcium sulfate with a ratio of 1:1.05 to the amount of magnesium hydroxide contained in salt mud to a certain quality of salt mud, put it in a 500ml beaker, add water to make a total volume of 400ml, and a solid-to-liquid ratio of 1 :4 Serum.

[0046] Step B: Pass 60ml / min pure carbon dioxide into the slurry obtained in step A, and carbonize at a temperature of 40°C for 60min. Calcium sulfate is converted into calcium carbonate, magnesium hydroxide is converted into soluble magnesium sulfate, and calcium and magnesium are separated by filtration.

[0047] Step C: Dry the filter cake obtained in Step B at 110°C for 10 hours, and then pulverize it to obtain a light calcium carbonate product

[0048] Step D: Concentrate the filtrate obtained in Step B at 100° C., crystallize by cooling, and dry to obtain the magnesium ...

Embodiment 2

[0050] 4. A method for producing light calcium carbonate and magnesium sulfate heptahydrate from salt mud, comprising the following steps:

[0051] Step A: Add calcium sulfate with a ratio of 1:1 to the amount of magnesium hydroxide contained in salt mud to a certain quality of salt mud, put it in a 500ml beaker, add water to make a total volume of 400ml, and a solid-to-liquid ratio of 1 :15 Serum.

[0052] Step B: Introduce 40ml / min pure carbon dioxide into the slurry obtained in step A and carbonize for 20min at a temperature of 60°C. Calcium sulfate is converted into calcium carbonate, magnesium hydroxide is converted into soluble magnesium sulfate, and calcium and magnesium are separated by filtration.

[0053] Step C: Dry the filter cake obtained in Step B at 110° C. for 6 hours, and then pulverize it to obtain a light calcium carbonate product.

[0054] Step D: Concentrate the filtrate obtained in Step B at 105° C., crystallize by cooling, and dry to obtain the magnesium ...

Embodiment 3

[0056] A kind of salt mud produces the method for light calcium carbonate and magnesium sulfate heptahydrate, comprises the following steps:

[0057] Step A: Add calcium sulfate with a ratio of 1:0.95 to the amount of magnesium hydroxide contained in salt mud to a certain quality of salt mud, put it in a 500ml beaker, add water to make a total volume of 400ml, and a solid-to-liquid ratio of 1 :10 Serum.

[0058] Step B: Introduce 60 ml / min of flue gas with a carbon dioxide volume fraction greater than 10% into the slurry obtained in step A, carbonize for 120 min at a temperature of 20° C., convert calcium sulfate into calcium carbonate, and convert magnesium hydroxide into soluble magnesium sulfate. Filtration realizes the separation of calcium and magnesium.

[0059] Step C: Dry the filter cake obtained in Step B at 110°C for 8 hours, and obtain light calcium carbonate product after crushing

[0060] Step D: Concentrate the filtrate obtained in Step B at 110°C, crystallize ...

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 provides a method for producing light calcium carbonate and magnesium sulfate heptahydrate from salty mud. The method includes mixing the salt mud (mainly comprising magnesium hydroxideand calcium carbonate) produced by a brine refining process with calcium sulfate, adding a certain amount of water for pulping, injecting carbon dioxide for a carbonization reaction to convert the calcium sulfate and the magnesium hydroxide into calcium carbonate sediments and soluble magnesium sulfate, and performing filtration to separate calcium and magnesium salt; drying a filter cake to obtain a light calcium carbonate product, and concentrating, crystalizing and drying filtrate to obtain a magnesium sulfate heptahydrate product. The method has the advantages that the greenhouse gas carbon dioxide is fastened while the light calcium carbonate and magnesium sulfate heptahydrate products are obtained through compressive utilization of the calcium and magnesium salt in the salty mud, harmless comprehensive utilization of the salty mud is realized, and certain economic benefits can be acquired.

Description

technical field [0001] The invention belongs to the technical field of inorganic chemical waste treatment and comprehensive utilization, and in particular relates to a method for producing light calcium carbonate and magnesium sulfate heptahydrate by using salt mud. Background technique [0002] As an important basic chemical raw material, soda ash is widely used in metallurgy, medicine, chemical industry, building materials and other industries. In 2017, the output of soda ash in my country was 26.771 million tons, ranking first in the world. In the process of producing soda ash by the ammonia-alkali method, the coarse brine needs to be refined, that is, a certain amount of lime milk is added first, so that the magnesium ions in the brine become magnesium hydroxide precipitates (commonly known as primary salt mud) and removed to obtain "primary brine". , and then lead to the top of the carbonization tower and tail gas containing carbon dioxide and ammonia or add sodium car...

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): C01F11/18C01F5/40
CPCC01F5/40C01F11/181
Inventor 刘润静刘兴赵华王勇韩晓娑
Owner HEBEI UNIVERSITY OF SCIENCE AND TECHNOLOGY
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