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Method for simultaneously producing sulphate aluminum cement and sulfuric acid through segmented calcination of phosphorus gypsum

A technology of sulfoaluminate cement and phosphogypsum, which is applied in chemical instruments and methods, sulfur compounds, inorganic chemistry, etc., can solve the problems of complex equipment and process flow, high production cost, and improper handling.

Active Publication Date: 2017-02-01
KINGENTA ECOLOGICAL ENG GRP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Chinese patent document CN1401604A discloses a manufacturing process of fast-hardening sulfoaluminate cement. The raw material ratio of this process is 17-20% of dehydrated phosphogypsum, 45-52% of limestone, and 31-35% of bauxite. The successful use of waste phosphogypsum to replace the natural gypsum in the raw meal mix can partially reduce the cost of sulphoaluminate cement, but the amount of phosphogypsum used in the process only accounts for 17-20% of the raw meal mix. 45-52% of limestone is needed, which fails to achieve the purpose of effective utilization of phosphogypsum. In addition, the decomposition of phosphogypsum in the process will release sulfur dioxide, which will cause environmental pollution if not handled properly
However, this process needs to convert phosphogypsum into calcium carbonate first, and then proceed to raw material proportioning and calcination. The required equipment and process are relatively complicated, and the production cost is high.

Method used

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  • Method for simultaneously producing sulphate aluminum cement and sulfuric acid through segmented calcination of phosphorus gypsum
  • Method for simultaneously producing sulphate aluminum cement and sulfuric acid through segmented calcination of phosphorus gypsum
  • Method for simultaneously producing sulphate aluminum cement and sulfuric acid through segmented calcination of phosphorus gypsum

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Experimental program
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preparation example Construction

[0015] a. Preparation of cement raw meal:

[0016] Dosing according to the following parts by mass: 75-90 parts of phosphogypsum, 22-32 parts of bauxite, and 3-5 parts of anthracite; mix all components, grind and homogenize to obtain cement raw meal;

[0017] b. Preparation of cement clinker:

[0018] The cement raw meal prepared in step a is first heated to 900-1200°C, and calcined at this temperature for 20-40 minutes; then heated to 1250-1300°C, calcined at this temperature for 20 minutes, and cement clinker is obtained after cooling; The sulfur dioxide tail gas generated during the calcination process is collected and sent to the sulfuric acid production system to prepare sulfuric acid;

[0019] c. Preparation of cement:

[0020] The cement clinker prepared in step b is ground again to obtain sulphoaluminate cement.

[0021] According to the present invention, preferably, the fineness of each component in step a after grinding is 80-150 mesh;

[0022] Preferably, Al in...

specific Embodiment approach

[0057] The present invention will be further described in detail below in conjunction with specific embodiments, but is not limited thereto.

[0058] In each of the following examples, the phosphogypsum is obtained from the dihydrate phosphogypsum of the wet-process phosphoric acid by-product of Jinzhengda Notair Chemical Co., Ltd., and its main components are shown in Table 1. The bauxite is taken from Guizhou, and its main components are shown in Table 2. .

[0059] Table 1: Main components and contents of phosphogypsum

[0060] components CaO SO 3

Fe 2 o 3

Al 2 o 3

SiO 2

content% 31.26 44.63 0.12 0.49 2.32

[0061] Table 2: Main composition and content of bauxite

[0062]

[0063]

Embodiment 1

[0065] Dosing according to the following mass parts: 75 parts of phosphogypsum, 32 parts of bauxite, and 3 parts of anthracite; mix each component evenly, grind to a fineness of 80 mesh, and make 250*100*50mm after homogenization block to get cement raw meal; place the prepared block raw meal in a tunnel kiln for calcination, first raise the temperature to 900°C, calcine at this temperature for 40 minutes, then raise the temperature to 1300°C, and calcine at this temperature for 20 minutes, After cooling, the cement clinker is obtained, and after calcination, the tail gas containing sulfur dioxide is sent to the sulfuric acid preparation system to prepare sulfuric acid; the burned clinker is ground again to 350m 2 / Kg, the sulphoaluminate cement product can be obtained, and the mechanical properties of the obtained sulphoaluminate cement are shown in Table 3.

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Abstract

The invention relates to a method for simultaneously producing sulphate aluminum cement and sulfuric acid through segmented calcination of phosphorus gypsum. The method comprises the following steps: entirely replacing limestone and natural gypsum by using the phosphorus gypsum, grinding and homogenizing the phosphorus gypsum, bauxite and anthracite, then preparing the sulphate aluminum cement via a segmented calcinations method. Through the method, the utilization rate of the phosphorus gypsum can be greatly increased; high-concentration sulfur dioxide tail gas can be absorbed for preparing the sulfuric acid; sulphate aluminum cement clinker prepared by the method is rapid in hardening speed, high in early strength and highly stable in later strength; a performance test shows that the mechanical strength of the sulphate aluminum cement prepared by the method meets the standard of rapidly-hardened sulphate aluminum cement.

Description

[0001] Technical field: [0002] The invention belongs to the technical field of cement materials, and relates to a method for preparing sulphoaluminate cement by using phosphogypsum, which is waste from phosphorus chemical industry, as a raw material. [0003] Background technique: [0004] With the modernization of engineering technology, the technical requirements for special cement are getting higher and higher. These include the special requirements for the speed of rapid setting and hardening and the hardness of each stage during the construction of special projects, such as the connection construction of cement pipelines, and the construction of foundation sites for large-scale equipment. However, although the application and the sales market continue to expand, they are limited due to the high cost of the product, making more users out of reach. On the other hand, as one of the world's three major phosphate fertilizer producers, it is difficult to realize mass utilizat...

Claims

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Application Information

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IPC IPC(8): C04B7/32C04B7/36C04B7/43C04B7/44C01B17/74
CPCC01B17/74C04B7/32C04B7/36C04B7/43C04B7/44
Inventor 陈宏坤刘阳于南树胡兆平李兴平
Owner KINGENTA ECOLOGICAL ENG GRP
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