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Method for producing building gypsum powder from ardealite

A technology of building gypsum powder and phosphogypsum, which is applied in the field of phosphogypsum reuse, can solve the problems of low purity and poor performance of calcium sulfate, achieve high strength, improve recycling rate, and simple process operation

Pending Publication Date: 2022-02-11
新希望化工投资有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, a large amount of phosphogypsum in actual production is untreated phosphogypsum produced by lower-quality phosphate rock, and also contains coarser silica impurities such as quartz, so the purity of calcium sulfate in the construction gypsum powder produced by this method is still not high. high, poor performance

Method used

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  • Method for producing building gypsum powder from ardealite
  • Method for producing building gypsum powder from ardealite
  • Method for producing building gypsum powder from ardealite

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] (1) Phosphogypsum and absorption liquid are configured into a slurry, and the required absorption liquid comes from the solution after absorbing the tail gas of the calciner;

[0033] (2) After stirring evenly, it is separated by cyclone to obtain the overflow product and the underflow product; the overflow product is filtered, and the filtrate is filtered to absorb the exhaust gas dust of the calciner; the filter cake is dried to obtain the primary gypsum powder;

[0034] (3) The primary gypsum powder is calcined at high temperature in a calciner to obtain building gypsum powder, and the hot gas of coal combustion is used to contact the primary gypsum powder for direct calcination.

[0035] The phosphogypsum slurry is configured according to the solid-to-liquid ratio of 10%; the cyclone specification is diameter Φ1 = 150mm, the diameter of the bottom outlet Φ2 = 20mm; the operating pressure of the cyclone = 0.1MPa; the overflow product is filtered and the drying tempera...

Embodiment 2

[0038] (1) Prepare phosphogypsum and absorption liquid into a slurry, and the required absorption liquid comes from the solution after absorbing the exhaust gas of the calciner

[0039] (2) After stirring evenly, it is separated by cyclone to obtain the overflow product and the underflow product; the overflow product is filtered, and the filtrate is filtered to absorb the exhaust gas dust of the calciner; the filter cake is dried to obtain the primary gypsum powder;

[0040] (3) The primary gypsum powder is calcined at high temperature in a calciner to obtain building gypsum powder, and the hot gas of coal combustion is used to contact the primary gypsum powder for direct calcination.

[0041] The phosphogypsum slurry is configured according to the solid-to-liquid ratio of 10%; the specification of the cyclone is diameter Φ1=75mm, the diameter of the bottom outlet Φ2=8mm; the operating pressure of the cyclone is 0.3MPa; the overflow product is filtered and the drying temperatur...

Embodiment 3

[0044] (1) Prepare phosphogypsum and absorption liquid into a slurry, and the required absorption liquid comes from the solution after absorbing the exhaust gas of the calciner

[0045] (2) After stirring evenly, it is separated by cyclone to obtain overflow product and underflow product; the overflow product is filtered, and the filtrate is filtered to absorb the exhaust gas dust of the calciner; the filter cake is dried to obtain primary gypsum powder;

[0046] (3) The primary gypsum powder is calcined at high temperature in a calciner to obtain building gypsum powder, and the hot gas of natural gas combustion is used to contact the primary gypsum powder for direct calcination.

[0047] The phosphogypsum slurry is configured according to the solid-to-liquid ratio of 40%; the cyclone specification is diameter Φ1 = 150mm, the diameter of the bottom outlet Φ2 = 20mm; the operating pressure of the cyclone = 0.1MPa; the overflow product is filtered and the drying temperature is 40...

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Abstract

The invention relates to a method for producing building gypsum powder from ardealite, which comprises the following steps: carrying out cyclone separation on ardealite slurry by a cyclone to obtain an overflow product and an underflow product; and filtering the overflow product to obtain a filter cake, and drying and calcining to obtain the building gypsum powder. By controlling reasonable particle size grading, the building gypsum prepared from the ardealite with lower quality also has higher strength, and the recycling rate of ardealite can be increased. The method is simple in process operation and low in calcination temperature, and does not generate waste gas and waste water in the production process.

Description

technical field [0001] The invention belongs to the technical field of phosphogypsum reuse, in particular to a method for producing building gypsum powder from phosphogypsum. Background technique [0002] In the current wet-process phosphoric acid production process, every ton of P 2 o 5 Effective product, accompanied by 4-6 tons of phosphogypsum. At present, most of the phosphogypsum solid waste can only be discharged by stockpiling, which occupies a large amount of land. At the same time, phosphogypsum soluble phosphorus, fluorine, etc. seep into the soil and water, causing great pollution. my country's phosphorus chemical industry discharges about 75 million tons of phosphogypsum solid waste per year, and the total utilization rate is less than 40%. The annual discharge and accumulation of phosphogypsum over the years has seriously restricted the sustainable development of the phosphorus chemical industry. The comprehensive utilization of phosphogypsum is mainly devel...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B11/024
CPCC04B11/024
Inventor 雷婷岳海荣陈浩马培根李春霖何建超
Owner 新希望化工投资有限公司
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