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Releasing impurities from calcium-based mineral

A mineral, calcium-based technology, used in calcium/strontium/barium compounds, calcium/strontium/barium oxides/hydroxides, ammonia compounds, etc., can solve the problems of expensive materials, increased maintenance costs, and high costs

Inactive Publication Date: 2019-07-23
CARBON CYCLE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Acidic environments are highly aggressive to equipment, requiring the use of expensive materials and increasing maintenance costs
Impurities dissolve in the acid solution, making them difficult and costly to remove from the process

Method used

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  • Releasing impurities from calcium-based mineral
  • Releasing impurities from calcium-based mineral
  • Releasing impurities from calcium-based mineral

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0117] Example 1: Effect of Salt Concentration.

[0118] The gypsum used in this example came from the mine and was ground to a particle size of less than 250 microns and an initial brightness value of 64.2%.

[0119] Tested under the following conditions:

[0120] The salt used in the ionic saline solution is ammonium sulfate.

[0121] Gypsum – 50g

[0122] Temperature – 102°C

[0123] Water Ratio – 1:10

[0124] Dwell time – 30 minutes

[0125]

[0126]

[0127] It is observed that the impurity layer is significantly darker from the concentration of 30% and higher.

[0128] It is believed that the resulting final brightness is optimized when the salt concentration is greater than 25%.

Embodiment 2

[0129] Example 2: Effect of temperature.

[0130] The gypsum used in this example came from the mine and was ground to a particle size of less than 250 microns and an initial brightness value of 64.2.

[0131] Tested under the following conditions:

[0132] Gypsum – 50g

[0133] Salt concentration – 40%

[0134] Water Ratio – 1:10

[0135] Dwell time – 30 minutes

[0136] temperature(℃) Final Brightness (%) 20 64.4 81 76.5 92 88.2 102 93.3

[0137] It is observed that the impurity layer is significantly darker from 92 °C and higher temperatures.

[0138] It is believed that the resulting final brightness is optimized at temperatures of 92°C and higher. However, it has been shown that a temperature of about 85°C will yield a brightness of about at least 80-85%, which may equate to a purity of about 90%, and thus may be sufficient for some uses.

Embodiment 3

[0139] Example 3: Effect of the ratio of gypsum to water.

[0140] The gypsum used in this example came from the mine and was ground to a particle size of less than 250 microns and an initial brightness value of 64.2.

[0141] Tested under the following conditions:

[0142] Gypsum – 50g

[0143] Salt concentration – 40%

[0144] Temperature – 102°C

[0145] Dwell time – 30 minutes

[0146] ratio Final Brightness (%) 1:2 89.2 1:5 90.1 1:10 93.3 1:20 97.4

[0147] It is believed that increasing the ratio of ammonium sulfate solution to gypsum improves the brightness of the resulting gypsum.

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Abstract

A method for releasing impurities from a calcium-based mineral is described. The method comprises reacting a calcium-based mineral containing impurities with an aqueous solution of one or more ionic salts at a temperature of approximately 85 degrees centigrade or above, wherein at least one of the calcium-based mineral and the one or more ionic salts comprises sulphate and at least one of the calcium-based mineral and the one or more ionic salts comprises ammonium, and wherein the concentration of the solution is approximately 25% or higher mass fraction, such that double salt crystals are formed and impurities are released. The method further comprises separating the double salt crystals from the impurities. Various products of the process are also described.

Description

technical field [0001] The present invention relates to methods of liberating impurities from calcium-based minerals, including increasing the purity of the calcium-based minerals, and products produced by these methods. Background technique [0002] Gypsum is usually sold as a filler or pigment. Furthermore, if the brightness and purity of gypsum can be brought to a comparable level, there is the possibility that gypsum powder can replace many other substances such as calcium carbonate, talc and titanium dioxide for various purposes. [0003] As an example, pure white calcium carbonate is of high commercial value as a powder when used as a filler or pigment. Through gypsum with ammonia and CO 2 The reaction to produce ammonium sulfate is a well-established method that has been used for many years and is well documented. At some point, this method was the main method for the production of ammonium sulfate. However, while it is an efficient method of producing ammonium su...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F11/46C01F11/18C01C1/24
CPCC01C1/028C01C1/04C01C1/24C01F11/18C01F11/185C01F11/46C01F11/466C01F11/468C01F11/42B43K19/003B43K19/16C01F11/02C01F11/48C09D13/00
Inventor 瓦卡斯·米尔扎史蒂芬·佛罗伦萨伊恩·泰克斯特戴维·塞维尔
Owner CARBON CYCLE
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