Method for producing low alkali cement by using high alkali raw materials

A technology for low-alkali cement and raw materials, applied in the direction of alkali metal chloride, etc., can solve the problems that low-alkali cement cannot meet the demand of low-alkali cement and the shortage of low-alkali raw materials, etc.

Active Publication Date: 2009-12-23
广灵金隅水泥有限公司
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Problems solved by technology

[0006]On the one hand, there is a large demand for low-alkali cement in the market, and on the other hand, the shortage of low-alkali raw materials makes the supply of low-alkali cement far from meeting the demand for low-alkali cement

Method used

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  • Method for producing low alkali cement by using high alkali raw materials

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Embodiment 1

[0041] The production line of a cement plant has a daily output of 3,000 tons of cement clinker (consumption of about 3,000 tons of hot raw materials and about 4,500 tons of raw materials) (using a dry-process cement rotary kiln with a suspension preheater and a precalciner kiln). See Table 1 and Table 2 below for the element content of raw materials and cement products before adding Cl element.

[0042] Table 1 The content of each element in the hot raw meal entering the kiln (%)

[0043] SiO 2

[0044] Content of each element in table 2 cement (%)

[0045] SiO 2

[0046] Under this condition, the alkali equivalent of the cement product is 0.14%+0.658×1.16%=0.90328%, which is greater than 0.60%, which does not meet the requirements of low-alkali cement.

[0047] Calculate the amount of added chlorine should be greater than 14.7 tons, less than 38.97 tons, see the following formula (4) and (5). Add 30 tons of PCB to the kiln system through the kiln he...

Embodiment 2

[0054] The production line of a cement factory produces 3,000 tons of cement clinker per day (dry cement rotary kiln with suspension preheater and precalciner kiln). 5.

[0055] Table 4 The content of each element in the hot raw meal entering the kiln (%)

[0056] SiO 2

[0057] Content of each element in table 5 cement (%)

[0058] SiO 2

[0059] Calculate the amount of added chlorine should be greater than 19.07 tons, less than 41.24 tons see the following formula (6) and (7).

[0060] Add 7.5 tons of fly ash per hour to the kiln system through the kiln head, with a Cl content of 12%. And 10% of the air volume of the system is drawn out by the device provided by the invention, the hot flue gas first passes through the mixing chamber to cool down and then enters the heat exchanger, heats the heat transfer oil in the heat exchanger, and the heat transfer oil provides heat for other heat-requiring equipment. The flue gas coming out of the heat exchang...

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Abstract

The invention provides a method for producing low alkali cement by using high alkali raw materials, which includes the steps of: putting the raw material limestone with alkali equivalent about 0.80% into a dry cement rotary kiln through a normal channel for putting the raw material into the kiln; adding chlorine-containing substances into the rotary kiln at the locations of a kiln head, a kiln head fuel burner, a flue chamber at kiln tail end, a pre-decomposition kiln or a pre-burning furnace; opening holes at the positions of the bottom part of the pre-decomposition kiln, an ascending flue channel, the flue chamber at kiln tail end or the tail grade cylinder of a pre-heater and inducting the chlorine-containing smoke gas enriched in the positions into a smoke dust collection system and collecting the smoke dust in the smoke gas. The smoke dust collection system comprises a mixing room. The method for producing low alkali cement by using high alkali raw materials uses the special property that alkali metal ions, chloride ions and sulfate ions mutually affect the melting point temperature under the high temperature coexistence condition, adds the chlorine-containing substances during the production process, and leads the chlorine in wastes to be reacted with the alkali in the raw materials by controlling the proportion between the alkali metal ions, chloride ions and sulfate ions entering the cement kiln, thereby achieving the double effects of reducing the alkali in the cement and processing high-chlorine wastes.

Description

technical field [0001] The invention relates to a method for producing cement and disposing of waste, more specifically, a method for producing low-alkali cement using a dry-process cement production line with a suspension preheater and a precalciner and limestone with a high alkali content, and synergistically Disposal method of high chlorine content waste such as PCB. Background technique [0002] In cement production, the alkali equivalent of raw meal has a direct impact on the quality of cement products. If the raw meal contains a small amount of alkali (Na, K), it will improve the burnability of the raw meal and increase the early strength of the raw meal. However, if the alkali equivalent in the raw meal is too high, causing the alkali equivalent in the clinker to exceed a certain range, such as greater than about 0.80%, it will increase the free calcium in the clinker, resulting in a decrease in the compressive strength and flexural strength of the cement , and affe...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B7/36C04B7/43C01D3/04
CPCC04B7/60
Inventor 赵启刚熊运贵孙伟舰余志辉渠永峰
Owner 广灵金隅水泥有限公司
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