Method for preparing calcium sulphate with sulfate containing bittern and calcium containing bittern

A technology of calcium sulfate dihydrate and sulfate, applied in the direction of calcium/strontium/barium sulfate, etc., can solve problems such as environmental pollution, waste of calcium sulfate resources, etc., and achieve the effects of simple process, reduced entrainment, and improved purity

Active Publication Date: 2010-09-01
TIANJIN SEA WATER DESALINATION & COMPLEX UTILIZATION INST STATE OCEANOGRAPHI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The by-produced calcium sulfate dihydrate can only be stored as waste residue, which not only wastes calcium sulfate resources, but also pollutes the environment.

Method used

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  • Method for preparing calcium sulphate with sulfate containing bittern and calcium containing bittern
  • Method for preparing calcium sulphate with sulfate containing bittern and calcium containing bittern
  • Method for preparing calcium sulphate with sulfate containing bittern and calcium containing bittern

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] Take sulfate-containing brine and calcium salt-containing brine, first use a settler to settle it to remove part of the insoluble matter, and discharge it from the lower part of the settler. The upper liquid phase overflowed from the settler is pumped into the plate and frame filter press, and the liquid phase is refined sulfate-containing brine and refined calcium-containing salt brine. The chemical composition of the refined sulfate-containing brine is detected as: K + 13g / l, Na + 60.7g / l, Mg 2+ 51.74g / l, SO 4 2- 64g / l, Cl - 175g / l; the chemical composition of the refined brine containing calcium salt is: K + 13g / l, Na + 60.7g / l, Ca 2+ 85.17g / l, Cl - 198.6g / l.

[0040] The sedimentation refined sulfate-containing brine and calcium salt-containing brine are added to a controlled crystallization reactor for reaction crystallization.

[0041] First, according to the SO in refined sulfate-containing brine and refined calcium-containing brine 4 2- : Ca 2+ The ...

Embodiment 2

[0048] Take sulfate-containing brine and calcium salt-containing brine, first use a settler to settle it to remove part of the insoluble matter, and discharge it from the lower part of the settler. The upper liquid phase overflowed from the settler is pumped into the plate and frame filter press, and the liquid phase is refined sulfate-containing brine and refined calcium-containing salt brine. The chemical composition of the refined sulfate-containing brine is detected as: K + 13g / l, Na + 60.7g / l, Mg 2+ 48.20g / l, SO 4 2- 50g / l, Cl - 175g / l; the chemical composition of the refined brine containing calcium salt is: K + 13g / l, Na + 60.7g / l, Ca 2+ 60g / l, Cl - 180.46g / l.

[0049] The sedimentation refined sulfate-containing brine and calcium salt-containing brine are added to a controlled crystallization reactor for reaction crystallization.

[0050] First, according to the SO in refined sulfate-containing brine and refined calcium-containing brine 4 2- : Ca 2+ The ra...

Embodiment 3

[0057] Take sulfate-containing brine and calcium salt-containing brine, first use a settler to settle it to remove part of the insoluble matter, and discharge it from the lower part of the settler. The upper liquid phase overflowed from the settler is pumped into the plate and frame filter press, and the liquid phase is refined sulfate-containing brine and refined calcium-containing salt brine. The chemical composition of the refined sulfate-containing brine is detected as: Na + 116.7g / l, SO 4 2- 80g / l, Cl - 121.30g / l; the chemical composition of the refined brine containing calcium salt is: Na + 51.83g / l, Ca 2+ 85g / l, Cl - 230.66g / l.

[0058] The sedimentation refined sulfate-containing brine and calcium salt-containing brine are added to a controlled crystallization reactor for reaction crystallization.

[0059] First, according to the SO in refined sulfate-containing brine and refined calcium-containing brine 4 2- : Ca 2+ The ratio of the molar ratio of 1:1 is tha...

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Abstract

The invention relates to a method for preparing the calcium sulfate with the sulfate-contained brine and the calcium-salt-contained brine; the two refined brines in a crystallization control reactor are uniformly and consecutively mixed with the cycling liquid inside a cycling lifting device to form dihydrate calcium sulfate crystal with large grain diameter; the dehydrate calcium sulfate crystalis centrifugally washed and dried to prepare the product of the high-purity dehydrate calcium sulfate. The flow rate of the refined sulfate-contained brine that is continuously added in a reaction crystallization barrel is determined according to the ratio between the flow rate of the refined sulfate-contained brine and the flow rate of the cycling liquid in the cycling lifting device in the reactor of 1:10 to 1:30. The flow rate of the refined calcium-salt-contained brine that is consecutively added is determined according to the mol ratio of 1:1 between the sulfate radical ion and the calcium ion in the refined sulfate-contained brine and the calcium-salt-contained brine.

Description

technical field [0001] The invention relates to the preparation technology of calcium sulfate in the field of inorganic chemical industry, in particular to a method for preparing calcium sulfate by using brine containing sulfate and brine containing calcium salt. Background technique [0002] Calcium Sulfate (CaSO 4 2H 2 O) has a wide range of uses and can be used as food additives, industrial fillers, etc. Calcium Sulfate (CaSO 4 2H 2 O) is commonly known as calcium sulfate dihydrate (gypsum), and its production methods mainly include crushing method, precipitation method and wet phosphoric acid by-product method. The crushing method is to use natural gypsum through crushing, removing impurities, and drying. Its purity mainly depends on the grade of natural gypsum. Precipitation production mainly uses calcium chloride and ammonium sulfate as raw materials, and produces calcium sulfate dihydrate precipitate through double decomposition reaction, which is prepared by sep...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01F11/46
Inventor 黄西平张雨山张家凯刘骆峰曹冬梅
Owner TIANJIN SEA WATER DESALINATION & COMPLEX UTILIZATION INST STATE OCEANOGRAPHI
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