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Four-step method process for controlling production of building plaster in industrial and fully automatic mode by using citric acid plaster

A technology of citric acid gypsum and building gypsum, which is applied in the field of four-step process, can solve the problems of short residence time, uneven heating of materials, and easy sticking to the wall of the cylinder, and achieve excellent product performance, broad promotion prospects, and high degree of automation. Effect

Inactive Publication Date: 2012-05-30
RIZHAO JINHE BOYUAN BIOCHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The process is simple and suitable for natural gypsum, desulfurized gypsum, and phosphogypsum with low raw material moisture, but it is not suitable for citrate gypsum. First, the processing capacity is large, and second, the moisture is high, which directly leads to high investment. , high operating costs, heavy dust removal load, and unstable process; in addition, citrate gypsum is different from natural gypsum, desulfurized gypsum, and phosphogypsum. Drying and calcination are completed in one step, which is not conducive to the performance improvement of its final product
[0005] The main drying methods are as follows: 1. Airflow drying, usually the hot flue gas is in direct contact with the material. The thermal efficiency is high and the energy consumption is low, but the material is polluted. In addition, the moisture is high and the processing capacity is large A set of airflow drying device for large citric acid gypsum cannot meet the requirements, the investment is high, and the dust removal load is large; 2. The Sider dryer, that is, the rotary flash dryer, is similar to a one-step calciner, and is not suitable for high-humidity materials. ; 3. Rotary kiln
Usually flue gas or heat conduction oil is used as the heating medium, the thermal efficiency is general, and materials with high moisture are rarely used, which are easy to stick to the wall of the cylinder and are heated unevenly; 4. Tube bundle dryer, a drying equipment with high thermal efficiency at present, but not It is suitable for gypsum materials, and the pipe wall phenomenon is serious; 5. The paddle heater uses heat transfer oil as the heating medium, and part of the dry material is returned to reduce the moisture content of the material. The material is heated unevenly, and the water vapor is large, which is not easy to discharge in time. Affects the calcination and dust removal system, not suitable for the treatment of materials with large moisture content
[0006] There are two main calcination methods, namely fast calcination and slow calcination. The representative of fast calcination is Sierde calcination furnace. The material stays in it for a short time, and the calcination effect is not good. Unstable performance; it can be seen that the above-mentioned disclosed technologies cannot be well applied in the recovery and production of citrate gypsum

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  • Four-step method process for controlling production of building plaster in industrial and fully automatic mode by using citric acid plaster
  • Four-step method process for controlling production of building plaster in industrial and fully automatic mode by using citric acid plaster

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] A kind of four-step method utilizing citric acid gypsum industrialized automatic control to produce building gypsum, its steps are as follows:

[0026] 1. The citric acid gypsum raw material is washed and pretreated, and a trace amount of calcium oxide is added thereto, and the pH value of the raw material after treatment is 6.62;

[0027] 2. The processed raw materials are quantitatively sent to the drum dryer by the conveyor belt, the drying time is 28 minutes, the drying temperature is controlled at 450 °C, and the attached water content after drying is 3.42%;

[0028] 3. Transport the dried material to the fluidized calciner;

[0029] 4. The calcination temperature of the calcination furnace is 180°C, the calcination time is 47 minutes, and the crystal water content of the discharged material is 3.65%;

[0030] 5. Send the calcined plaster of paris to a ball mill for grinding;

[0031] 6. Send the ground gypsum powder into the finished product warehouse by the con...

Embodiment 2

[0034] A kind of four-step method utilizing citric acid gypsum industrialized automatic control to produce building gypsum, its steps are as follows:

[0035] 1. The citric acid gypsum raw material is washed and pretreated, and a small amount of sodium hypochlorite is added thereto, and the pH value of the raw material after treatment is 7.83;

[0036]2. The processed raw materials are quantitatively sent to the drum dryer by the conveyor belt. The drying time is 25 minutes, the drying temperature is controlled at 480°C, and the attached water content after drying is 5.67%;

[0037] 3. Transport the dried material to the fluidized calciner;

[0038] 4. The calcination temperature of the calcination furnace is 170°C, the calcination time is 45 minutes, and the crystal water content of the discharged material is 4.24%;

[0039] 5. Send the calcined plaster of paris to a ball mill for grinding;

[0040] 6. Send the ground gypsum powder into the finished product warehouse by the...

Embodiment 3

[0043] A kind of four-step method utilizing citric acid gypsum industrialized automatic control to produce building gypsum, its steps are as follows:

[0044] 1. The citric acid gypsum raw material is washed and pretreated, and a small amount of sodium hydroxide and calcium hypochlorite are added thereto, and the pH value of the raw material after treatment is 7.74;

[0045] 2. The processed raw materials are quantitatively sent to the drum dryer by the conveyor belt, the drying time is 23 minutes, the drying temperature is controlled at 500 °C, and the attached water content after drying is 2.58%;

[0046] 3. Transport the dried material to the fluidized calciner;

[0047] 4. The calcination temperature of the calcination furnace is 175°C, the calcination time is 42 minutes, and the crystal water content of the discharged material is 4.33%;

[0048] 5. Send the calcined plaster of paris to a ball mill for grinding;

[0049] 6. Send the ground gypsum powder into the finished...

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Abstract

The invention relates to a technological method for controlling production of a building plaster in an industrial and fully automatic mode by using a citric acid plaster, namely, four-step method process consisting of pretreating, drying, calcining and grinding steps. Aiming at the characteristic of the citric acid plaster, the process performs all-around process optimization to realize stable production process, high automatic degree and high, stable and easily controllable product quality. The invention aims to comprehensively treat and recycle a solid waste, namely, the citric acid plasterin a citric acid industry to fulfill the aim of making waste profitable, saving energy and reducing emission. Simultaneously, the building plaster produced by using the citric acid plaster has high performance, can replace natural plaster as a novel building material so as to protect national natural mineral resources and has wide application and market prospect.

Description

technical field [0001] The invention relates to a comprehensive treatment process of citric acid gypsum, in particular to a four-step process for producing building gypsum with fully automatic control of the industrialization of citric acid gypsum. Background technique [0002] A large amount of citric acid gypsum will be produced in the production process of citric acid enterprises, and its main solid waste is calcium sulfate dihydrate. At present, the common practice adopted by most enterprises is to expropriate or rent land for temporary storage or landfill, which not only occupies a large amount of cultivated land, but also wastes resources , and did not fundamentally solve the problem of solid waste pollution, causing solid waste to pile up like a mountain, forming a new type of white pollution or gray pollution. Citrate gypsum looks like a solid waste, but it is actually a very valuable building material resource. If it can be properly utilized and comprehensively deve...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B11/26
CPCC04B11/266
Inventor 寇光智裴振洪于海彬
Owner RIZHAO JINHE BOYUAN BIOCHEM
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