Phosphogypsum sulphoaluminate cement sulfuric acid coproduction method

A technology for sulfoaluminate cement and sulfoaluminate production, which is applied in chemical instruments and methods, sulfur compounds, inorganic chemistry, etc., and can solve the problems of ineffective utilization of phosphogypsum, high production cost, and environmental pollution.

Active Publication Date: 2017-02-22
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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  • Phosphogypsum sulphoaluminate cement sulfuric acid coproduction method

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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: 65-80 parts of phosphogypsum, 20-32 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] Calcining the cement raw meal prepared in step a at 1250-1300°C for 30-40 minutes to obtain cement clinker, collecting the sulfur dioxide tail gas generated during the calcination process and sending it to a 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 120-180 mesh;

[0022] Preferably, Al in the described bauxite 2 o 3 The mass fraction is 50-60%, further preferably 55%;

[0023] Preferably, the phosphogypsum is phos...

specific Embodiment approach

[0054] The present invention will be further described in detail below in conjunction with specific embodiments, but is not limited thereto.

[0055] In each of the following examples, phosphogypsum is obtained from the hemihydrate gypsum by-product of the new wet-process phosphoric acid of Jinzheng Da Nuo Taier Chemical Co., Ltd., and its main components are shown in Table 1. Bauxite is obtained from Guizhou, and its main The ingredients are shown in Table 2.

[0056] Table 1: Main components and contents of phosphogypsum

[0057] components CaO SO 3

Fe 2 o 3

Al 2 o 3

SiO 2

content% 36.96 52.63 0.15 0.57 1.97

[0058] Table 2: Main composition and content of bauxite

[0059] components CaO Fe 2 o 3

Embodiment 1

[0061] Dosing according to the following parts by mass: 65 parts of phosphogypsum, 32 parts of bauxite, and 3 parts of anthracite; then grind and mix each component until the fineness is 120 mesh to obtain raw cement meal; prepare the raw cement The material is placed in a rotary kiln and calcined at 1300°C for 30 minutes to obtain cement clinker. After calcining, the tail gas containing sulfur dioxide is sent to the sulfuric acid preparation system to prepare sulfuric acid; the fired cement 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 phosphogypsum sulphoaluminate cement sulfuric acid coproduction method; wherein, phosphogypsum replacing completely limestone and natural gypsum, after being ground and homogenized with bauxite and anthracite culm, at 1250-1300 DEG C, calcinating and resulting in the sulphoaluminate cement. The exploitation rate of phosphogypsum in the method is increased to a large extent; high concentration of sulfur dioxide tail gas through absorption is prepared into sulfuric acid. The hardening speed of sulphoaluminate cement clinker is quick, the intensity of sulphoaluminate cement is high during the former and later phase, performance test shows that the mechanical strength of the sulphoaluminate cement prepared by the method accords with the standard of sulphoaluminate 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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Patent Type & Authority Applications(China)
IPC IPC(8): C04B7/32C01B17/74
CPCC01B17/74C04B7/32
Inventor 李淑庆胡兆平刘阳于南树
Owner KINGENTA ECOLOGICAL ENG GRP
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