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

A light magnesium carbonate, calcium carbonate technology, applied in the direction of magnesium carbonate, calcium carbonate/strontium/barium, alkali metal silicate, etc. Easy operation, simple method and high economic efficiency

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

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Embodiment 1

[0035] A method for producing light magnesium carbonate and co-producing calcium carbonate and water glass with chlor-alkali salt mud, 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. The salt mud contains compounds mainly composed of magnesium oxide, calcium oxide and silicon dioxide; then, put the obtained salt mud into the first carbonizer (2), and pass carbon dioxide into the first carbonizer (2) Gas, so that the magnesium oxide and carbon dioxide contained in the salt mud are carbonized according to the mass ratio of pure substances 1:2.0; at this time, magnesium oxide reacts with carbon dioxide and 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, which is basically insoluble in water and thus precipitates; the product obtained by the carbonization...

Embodiment 2

[0037] A method for producing light magnesium carbonate and co-producing calcium carbonate and water glass with chlor-alkali salt mud, 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. The salt mud contains compounds mainly composed of magnesium oxide, calcium oxide and silicon dioxide; then, put the obtained salt mud into the first carbonizer (2), and pass carbon dioxide into the first carbonizer (2) Gas, so that the magnesium oxide and carbon dioxide contained in the salt mud are carbonized according to the mass ratio of pure substances 1:1.8; at this time, magnesium oxide reacts with carbon dioxide and 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, which is basically insoluble in water and thus precipitates; the product obtained by the carbonization r...

Embodiment 3

[0039] A method for producing light magnesium carbonate and co-producing calcium carbonate and water glass with chlor-alkali salt mud, 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. The salt mud contains compounds mainly composed of magnesium oxide, calcium oxide and silicon dioxide; then, put the obtained salt mud into the first carbonizer (2), and pass carbon dioxide into the first carbonizer (2) Gas, so that the magnesium oxide and carbon dioxide contained in the salt mud are carbonized according to the mass ratio of pure substances 1:2.2; at this time, magnesium oxide reacts with carbon dioxide and 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, which is basically insoluble in water and thus precipitates; the product obtained by the carbonization...

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Abstract

The invention discloses a method for co-production of 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 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 and seas,...

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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