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Efficient calcium thioaluminate type bulking agent and its preparing process

A technology of calcium sulfoaluminate and calcium sulfoaluminate, which is applied in the field of improved design of concrete expansion additives and supporting production technology, and can solve the problems of difficult realization, high dosage, high price and cost, etc.

Inactive Publication Date: 2002-09-18
陈智丰
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Problems solved by technology

[0004] Domestic research since the 1970s has proved that CAS expansion agent has superior performance, but the price and cost are too high. Electric furnace melting method calcination cannot be applied in China, and it is difficult to realize it with low-cost rotary kiln technology.
In the mid-1970s, expansion agents with alunite and anhydrite as the main components appeared in China. Although the cost was low, their performance was unstable, the expansion cycle was long, the alkali content was high, and the dosage was high. Compared with CAS expansion agents, their performance was still inferior. There is a big gap

Method used

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  • Efficient calcium thioaluminate type bulking agent and its preparing process
  • Efficient calcium thioaluminate type bulking agent and its preparing process

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Embodiment Construction

[0011] In order to achieve the purpose of the present invention, this improvement designs the production process of CAS type expansion agent into two main proportioning processes. Firstly, the raw materials of limestone, gypsum and bauxite are put into the rotary kiln for calcination. , the embodiment of its proportioning is as follows: (percentage by weight)

[0012] Examples Limestone Gypsum Bauxite

[0013] 1 85 10 5

[0014] 2 83 2 15

[0015] 3 70 15 15

[0016] 4 50 20 30

[0017] According to the above examples, the three raw materials are pulverized and prepared, homogenized and put into a rotary kiln at 1200° C. to 1400° C. to be calcined into granular clinker containing calcium sulfoaluminate.

[0018] The actual content of calcium sulfoaluminate in the clinker and the gypsum raw meal are rationally combined again, and limestone can also be added appropriately to adjust the characteristics. The specific examples are as follows:

[0019] Examples Calcium sulf...

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Abstract

An efficient calcium thioaluminate type bulking agent, an improvement on CAS-type one, features that the lime stone, gypsum and bauxite are first calcined in rotary kiln to prepare clinker, which is them mixed with gypsum and ground while lime stone is added to generate CAS-type bulking agent. Its advantages are high performance and low content of alkali.

Description

technical field [0001] The invention belongs to the improved design and matching production process of a concrete expansion additive, in particular to the improvement of the production process of a calcium sulfoaluminate type expansion agent. Background technique [0002] Obtaining a certain degree of expansion in the early stage of hardening is an important means to improve the performance of concrete. For this reason, countries all over the world are competing to develop various types of expansive cements and expansive agents. Although there are many chemical substances that can cause the expansion of concrete through corresponding chemical reactions, there are mainly three types of expansion agents that have been applied so far: Cao hydration to Ca(OH) 2 , Mgo hydrates to Mg(OH) 2 , to generate calcium sulfoaluminate hydrate. Due to the instability of Cao and Mgo itself and the chemical reaction process of the expansion process, Cao and Mgo are rarely used as the main ...

Claims

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Application Information

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IPC IPC(8): C04B7/32C04B7/52
CPCC04B7/52C04B7/323
Inventor 陈智丰张振秋
Owner 陈智丰
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