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Method for co-production of ultra-fine calcium carbonate and sodium silicate in preparation of light magnesium carbonate by chlor-alkali brine sludge

A technology of ultra-fine calcium carbonate and light magnesium carbonate, applied in the directions of magnesium carbonate, calcium carbonate/strontium/barium, alkali metal silicate, etc., can solve the problems of no utilization and excavation, not a comprehensive utilization of salt mud and other problems , to achieve the effect of easy operation, simple method and high economic benefit

Inactive Publication Date: 2011-12-07
汪晋强
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the process described in this invention only utilizes the barium sulfate and calcium compounds contained in the salt mud, but does not utilize and excavate magnesium compounds and silicon compounds. Therefore, it is not an ideal comprehensive utilization process of salt mud

Method used

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  • Method for co-production of ultra-fine calcium carbonate and sodium silicate in preparation of light magnesium carbonate by chlor-alkali brine sludge
  • Method for co-production of ultra-fine calcium carbonate and sodium silicate in preparation of light magnesium carbonate by chlor-alkali brine sludge

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Effect test

Embodiment 1

[0039]A method for producing light magnesium carbonate with chlor-alkali salt mud to co-produce ultra-fine calcium carbonate and water glass, comprising the steps of washing and filtering 500kg of chlor-alkali salt mud with a washing filter (1) three times to remove soluble acid radical impurities, thereby When the salt mud contains magnesium oxide, calcium oxide and silicon dioxide as the main components of the compound; then, the resulting salt mud is put into the first carbonizer (2), and in the first carbonizer (2) Inject pure carbon dioxide gas to carbonize the magnesia and carbon dioxide contained in the salt mud according to the mass ratio of pure substances 1:2.0; at this time, magnesia reacts with carbon dioxide and water to produce magnesium bicarbonate or magnesium carbonate, both of which can be Soluble in water; Calcium oxide reacts with carbon dioxide to produce calcium carbonate, which is basically insoluble in water and thus precipitates; the product obtained by...

Embodiment 2

[0041] A method for producing light magnesium carbonate with chlor-alkali salt mud to co-produce ultra-fine calcium carbonate and water glass, comprising the steps of washing and filtering 500kg of chlor-alkali salt mud with a washing filter (1) three times to remove soluble acid radical impurities, thereby When the salt mud contains magnesium oxide, calcium oxide and silicon dioxide as the main components of the compound; then, the resulting salt mud is put into the first carbonizer (2), and in the first carbonizer (2) Enter the mixed gas that contains carbon dioxide gas volume and be 25%, make the magnesia contained in the salt mud and carbon dioxide carry out carbonization according to the mass ratio of pure matter 1: 1.8, carbonization reaction temperature is controlled as 15~20 ℃; Carbon dioxide reacts with water to produce magnesium bicarbonate or magnesium carbonate, both of which are soluble in water; calcium oxide reacts with carbon dioxide to produce calcium carbonate...

Embodiment 3

[0043] A method for producing light magnesium carbonate with chlor-alkali salt mud to co-produce ultra-fine calcium carbonate and water glass, comprising the steps of washing and filtering 500kg of chlor-alkali salt mud with a washing filter (1) three times to remove soluble acid radical impurities, thereby When the salt mud contains magnesium oxide, calcium oxide and silicon dioxide as the main components of the compound; then, the gained salt mud is dropped into the first carbonizer (2), and the first carbonizer (2) contains The carbon dioxide gas volume is a mixed gas of 40%, so that the magnesia and carbon dioxide contained in the salt mud are carbonized according to the mass ratio of pure substance 1: 2.2, and the carbonization reaction temperature is controlled at 20-25°C; at this time, the magnesia and carbon dioxide and Water reaction produces magnesium bicarbonate or magnesium carbonate, both of which are soluble in water; calcium oxide reacts with carbon dioxide to pr...

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Abstract

The invention discloses a method for co-production of ultra-fine calcium carbonate and sodium silicate in the preparation of light magnesium carbonate by chlor-alkali brine sludge. In the method, brine sludge is filter-washed through a washing filter, and calcium compounds, magnesium compounds, silicon compounds and the like in the brine sludge are then respectively converted into magnesium carbonate, calcium carbonate and sodium silicate in an effective way through carbonation, filtration, centrifugation and the like. Therefore, the method fully develops the potential value of the brine sludge, and provides an economical and effective way for comprehensive utilization of the brine sludge.

Description

technical field [0001] The invention relates to a production method of magnesium carbonate and calcium carbonate, in particular to a method of using chlor-alkali salt mud to produce light magnesium carbonate and co-produce superfine calcium carbonate and water glass. Background technique [0002] Chlor-alkali salt mud comes from the pulpy discharge produced during the refining process of raw salt, and the precipitated discharge obtained after separating part of the sodium chloride from brine is sea salt mud. The main components of salt mud are magnesium oxide, calcium oxide, silicon dioxide, barium sulfate and a small amount of sodium chloride and mud. Therefore, it has potentially huge utilization value. However, at present, the salt mud of most manufacturers has not been effectively treated and utilized. It is only used for building dams and roadbed materials after dehydration, or is piled up in the factory all year round. Or directly discharged into nearby rivers, lakes...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01F5/24C01F11/18C01B33/32
Inventor 王嘉兴
Owner 汪晋强
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