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A kind of production method of calcium aluminate for high-performance water treatment agent

A water treatment agent, calcium aluminate technology, applied in the preparation of calcium aluminate, alkaline earth metal aluminate/alumina/aluminum hydroxide, etc., can solve the problems of hindering the movement of materials, affecting the ventilation in the cellar, and high production costs

Active Publication Date: 2020-10-23
YAOBAI SPECIAL CEMENT TECH R&D CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The "ringing" leads to the uneven material layer of the rotary kiln, which reduces the effective cross-sectional area of ​​the kiln, increases the resistance of the rotary kiln system, seriously affects the ventilation in the kiln, hinders the movement of materials, and reduces the working efficiency of the rotary kiln.
For this reason, the conventional treatment method is to prepare the ring machine on site. Once the "ring" is formed, the kiln will be stopped and the ring will be restarted, which will lead to high production costs, serious damage to the kiln refractory material, and shortened kiln operation cycle. ACCIDENT

Method used

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  • A kind of production method of calcium aluminate for high-performance water treatment agent
  • A kind of production method of calcium aluminate for high-performance water treatment agent
  • A kind of production method of calcium aluminate for high-performance water treatment agent

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Experimental program
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Effect test

Embodiment 1

[0031] The raw materials are bauxite and limestone, and the mass ratio of the two is 45:55. The raw materials are crushed, ground and mixed evenly to obtain raw meal.

[0032] Put the raw material into the large-scale dry-process cement rotary kiln, control the feeding rate of 140t / h, the outlet temperature of the first-stage cyclone is 250°C, the pressure is -3000Pa, the outlet temperature of the calciner is 750°C, the pressure is -700Pa, and the outlet temperature of the fifth-stage cyclone is 750°C ℃, pressure -900Pa, five-stage feeding pipe temperature 700℃, kiln tail temperature 900℃, pressure -100Pa, control kiln head negative pressure -100Pa, control secondary air temperature 750℃, control head and tail coal consumption ratio to 65% : 35%, control the decomposition rate of raw meal into the kiln to 80%, and control the clinker vertical lift weight to 700g / L. Control the air chamber pressure within the zero pressure point of the grate cooler: the air chamber pressure of ...

Embodiment 2

[0035] The raw materials are bauxite and limestone, and the mass ratio of the two is 50:50. The raw materials are crushed, ground and mixed evenly to obtain raw meal.

[0036] Put the raw material into the large-scale dry-process cement rotary kiln, control the feeding amount of 150t / h, the outlet temperature of the first-stage cyclone is 275°C, the pressure is -3500Pa, the outlet temperature of the calciner is 775°C, the pressure is -800Pa, and the outlet temperature of the fifth-stage cyclone is 775 ℃, pressure -1000Pa, five-stage feeding pipe temperature 780℃, kiln tail temperature 950℃, pressure -150Pa, control kiln head negative pressure -80Pa, control secondary air temperature 850℃, control head and tail coal consumption ratio to 67% : 33%, control the decomposition rate of raw material entering the kiln to 83%, and control the vertical weight of clinker to 750g / L. Control the air chamber pressure within the zero pressure point of the grate cooler: the air chamber pressu...

Embodiment 3

[0039] The raw materials are bauxite and limestone, and the mass ratio of the two is 55:45. The raw materials are crushed, ground and mixed evenly to obtain the raw meal.

[0040] Put the raw material into the large-scale dry-process cement rotary kiln, control the feeding amount of 160t / h, the outlet temperature of the first-stage cyclone is 300°C, the pressure is -4000Pa, the outlet temperature of the calciner is 800°C, the pressure is -900Pa, and the outlet temperature of the fifth-stage cyclone is 800°C ℃, pressure -1100Pa, five-stage feeding pipe temperature 800℃, kiln tail temperature 1000℃, pressure -200Pa, control kiln head negative pressure -60Pa, control secondary air temperature 950℃, control head and tail coal consumption ratio to 70% : 30%, control the decomposition rate of raw meal into the kiln to 85%, and control the vertical weight of clinker to 800g / L. Control the air chamber pressure within the zero pressure point of the grate cooler: the air chamber pressur...

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Abstract

The invention provides a method for producing calcium aluminate for a high-performance water treatment agent by using a large-scale dry cement rotary kiln sintering method. Raw materials are bauxite and limestone, wherein the mass ratio of the bauxite to the limestone is (45-70):(55-30). The method comprises the following steps: (1) crushing the raw materials, carrying out grounding, and uniformlymixing the raw materials to obtain untreated materials; and (2) adding the untreated materials into a large dry cement rotary kiln for calcining, sintering the untreated materials into clinker, and then grinding the clinker into calcium aluminate for a water treatment agent. According to the invention, the calcium aluminate is produced by using the large dry cement rotary kiln, so that limitations of ''ring formation'', ''ball formation'', ''crust formation'' and the like on existing production processes and equipment are overcome, poor processes such as damage of kiln refractory materials, shortening of kiln operation period and the like are avoided, energy consumption and production cost are reduced, production efficiency is improved, and yield and quality of products are improved.

Description

technical field [0001] The invention relates to a production method of calcium aluminate for high-performance water treatment agent, in particular to a method for producing calcium aluminate for high-performance water treatment agent by using a large-scale dry-process cement rotary kiln sintering method. Background technique [0002] Calcium aluminate is the raw material of off-white powder water purifier, the main components are CaO, Al 2 o 3 , Fe 2 o 3 , mainly used for the production of water-treated aluminum salts such as polyaluminum chloride, aluminum sulfate, and sodium aluminate. It can also be used for the adjustment of the degree of alkalization, and can also be used for refractory materials. Calcium aluminate is slightly soluble in water, the aqueous solution is alkaline, and the pH value is about 11. It has a high reactivity with inorganic strong acids and can be produced at room temperature, with a large heat release and rapid temperature rise. The dissolutio...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01F7/16
CPCC01F7/164
Inventor 白明科李海宏赵健王红升杨国开王亚锋黄增
Owner YAOBAI SPECIAL CEMENT TECH R&D CO LTD