Method for coproduction of ammonia sulfate and superfine light calcium carbonate from fluorgypsum

A light calcium carbonate and fluorogypsum technology, applied in the direction of calcium carbonate/strontium/barium, ammonium sulfate, etc., can solve the problems of fluorogypsum insoluble in water, polluted soil and groundwater environment, slow hydration, etc.

Inactive Publication Date: 2009-07-22
DO FLUORIDE CHEM CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Fluorogypsum (CaS0 4 ) has not been well applied due to the shortcomings of insoluble in water, slow hydration, poor coagulation ability, and no early strength.
At present, part of fluorine gypsum is used as an admixture of cement, and most of the

Method used

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  • Method for coproduction of ammonia sulfate and superfine light calcium carbonate from fluorgypsum
  • Method for coproduction of ammonia sulfate and superfine light calcium carbonate from fluorgypsum
  • Method for coproduction of ammonia sulfate and superfine light calcium carbonate from fluorgypsum

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] The method that utilizes fluorogypsum of the present embodiment to produce superfine light calcium carbonate to co-produce ammonium sulfate may further comprise the steps:

[0031] ①Crush the fluorine gypsum into fluorine gypsum powder passing through a -40 mesh sieve;

[0032] ② Wash and filter the fluorogypsum powder until the pH value of the filtrate is 4, then add an appropriate amount of water to the filter cake to make a thin paste with a calcium sulfate solid content of 10%;

[0033] ③ Add 0.2% sodium lauryl sulfate to the thin paste, add a mixture of ammonium carbonate and ammonium bicarbonate whose total amount is 1.05 times the amount of calcium sulfate, and its mass ratio is 10:1, Stir the reaction at 40°C for 3 hours, and the gas generated is used to recover ammonium carbonate or ammonium bicarbonate;

[0034] ④ After the reaction is completed, filter, wash the precipitate until the washing water is detected with a barium chloride solution without white pre...

Embodiment 2

[0037] The method that utilizes fluorogypsum of the present embodiment to produce superfine light calcium carbonate to co-produce ammonium sulfate may further comprise the steps:

[0038] ①Crush the fluorogypsum into fluorogypsum powder passing through a -60 mesh sieve;

[0039] ② Wash and filter the fluorogypsum powder until the pH value of the filtrate is 4.5, then add an appropriate amount of water to the filter cake to make a thin paste with a calcium sulfate solid content of 15%;

[0040] 3. add the ammoniacal liquor of 0.1 times of the amount of calcium sulfate substance, 1% sodium lauryl sulfate in thin paste, the total amount is the ammonium carbonate and ammonium bicarbonate mixture of 1.1 times of the amount of calcium sulfate substance, and its mass ratio is 5:1, stirring and reacting at 45°C for 4 hours, the gas generated is used to recover ammonium carbonate or ammonium bicarbonate;

[0041] ④ After the reaction is completed, filter, wash the precipitate until th...

Embodiment 3

[0044] The method that utilizes fluorogypsum of the present embodiment to produce superfine light calcium carbonate to co-produce ammonium sulfate may further comprise the steps:

[0045] ① Grinding the fluorine gypsum into fluorine gypsum powder passing through a -90 mesh sieve;

[0046] ② Washing and filtering the fluorogypsum powder until the pH value of the filtrate is 5, then adding an appropriate amount of water to the filter cake to make a thin paste with a calcium sulfate solid content of 20%;

[0047] 3. add the ammoniacal liquor of 0.4 times of the amount of calcium sulfate substance, 2% sodium lauryl sulfate in thin paste, the total amount is the ammonium carbonate and ammonium bicarbonate mixture of 1.15 times of the amount of calcium sulfate substance, and its mass ratio is 3:1, stirring and reacting at 50°C for 5 hours, the gas generated is used to recover ammonium carbonate or ammonium bicarbonate;

[0048] ④ After the reaction is completed, filter, wash the pr...

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Abstract

The invention discloses a method which utilizes fluorgypsum to prepare super-fine light calcium carbonate so as to co-produce ammonium sulphate, including the following steps: the fluorgypsum is smashed and scrubbed with water to prepare fluorgypsum thin paste, and then ammonia water is added or not added, and the mixture of a surface active agent, ammonium carbonate and ammonium bicarbonate is added to carry out closed stirring reaction. Generated gas is used for recycling the ammonium bicarbonate or the ammonium carbonate. Filtration is carried out after the reaction, a filter cake is washed and dried to obtain the super-fine light calcium carbonate, and recycled washing water and filtrate obtained from the filtration are concentrated and crystallized to obtain the ammonium sulphate. The method has the advantages that: (1) the fluorgypsum is recycled as resource so as to change waste to be valuable and protect environment; 2) the fluorgypsum and the ammonium carbonate are adopted as raw materials, with low production cost; 3) the quality of products obtained by the method is better than that of products prepared by other methods and most of indicators are below the technical requirements of industrial products and agricultural commodities.

Description

technical field [0001] The invention relates to a method for producing superfine light calcium carbonate and co-producing ammonium sulfate by utilizing fluorine gypsum. Background technique [0002] Ultrafine light calcium carbonate is a new type of ultrafine solid material developed in the late 1980s. As an inorganic filler, it has been widely used in industrial products such as rubber, plastics, papermaking, coatings, and inks. The main method of industrial production of light calcium carbonate is to pass milk of lime into CO 2 The gas is prepared by carbonization reaction. [0003] As an important raw material in the chemical industry, ammonium sulfate is widely used in agriculture, metallurgy, medicine, leather, wood preservation, textiles, electroplating and other industries. For a long time, my country has basically used ammonia and sulfuric acid (including sulfuric acid recovered from smelting flue gas) to produce ammonium sulfate. Due to the scarcity of sulfur res...

Claims

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Application Information

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IPC IPC(8): C01F11/18C01C1/24
Inventor 皇甫根利刘海霞张梅刘晓霞张运祥李洁
Owner DO FLUORIDE CHEM CO LTD
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