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Method for producing light calcium carbonate and magnesium sulfate heptahydrate from salty mud

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

Active Publication Date: 2019-04-05
HEBEI UNIVERSITY OF SCIENCE AND TECHNOLOGY
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  • Abstract
  • Description
  • Claims
  • Application Information

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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

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  • Method for producing light calcium carbonate and magnesium sulfate heptahydrate from salty mud
  • Method for producing light calcium carbonate and magnesium sulfate heptahydrate from salty mud
  • Method for producing light calcium carbonate and magnesium sulfate heptahydrate from salty mud

Examples

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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: Into the slurry obtained in step A, feed 60ml / min pure carbon dioxide at a temperature of 40°C for carbonization for 60min, calcium sulfate is converted into calcium carbonate, magnesium hydroxide is converted into soluble magnesium sulfate, and the separation of calcium and magnesium is achieved 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: the filtrate obtained in step B is concentrated at 100°C, crystallized by cooling, and dried...

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: Into the slurry obtained in step A, feed 40ml / min pure carbon dioxide at a temperature of 60°C for carbonization for 20min, calcium sulfate is converted into calcium carbonate, magnesium hydroxide is converted into soluble magnesium sulfate, and the separation of calcium and magnesium is achieved 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: the filtrate obtained in step B is concentrated at 105°C, crystallized by cooling, and dried to o...

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 then pulverize it to obtain a light calcium carbonate product

[0060] Step D: the filtrate obtained in step B is concentrated at 110°C, ...

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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 industry waste treatment and comprehensive utilization, in particular to a method for producing light calcium carbonate and magnesium sulfate heptahydrate from 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 carbonate ...

Claims

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Application Information

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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
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