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Method for preparing hydraulic calcium oxide through papermaking alkali recycling causticized white sludge

A technology for causticizing white mud and hydraulic setting, which is applied in the field of preparing new building materials, can solve the problems of rare patent discussion, difficult to popularize and high fuel cost, and achieve the effect of saving calcination cost, reducing calcining energy consumption and reducing dust pollution.

Inactive Publication Date: 2011-05-25
NANJING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Calcining lime in rotary kiln, based on the consumption of 125 kg of heavy oil per ton of pulp slag in the caustic soda slag recovery kiln in Finland, the fuel cost for calcination is as high as 300 yuan / ton of lime, which is difficult to promote in my country
A novelty search of domestic and foreign patents found that there are many patents on black liquor treatment for the recovery of wood pulp and papermaking alkali, and few patents on the treatment of straw pulp silicon-containing causticization white sludge

Method used

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  • Method for preparing hydraulic calcium oxide through papermaking alkali recycling causticized white sludge
  • Method for preparing hydraulic calcium oxide through papermaking alkali recycling causticized white sludge
  • Method for preparing hydraulic calcium oxide through papermaking alkali recycling causticized white sludge

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Effect test

Embodiment 1

[0044] to combine figure 2 , the method for preparing hydraulic calcium oxide from causticized lime mud by papermaking alkali of the present invention comprises the following steps:

[0045] Step 1: Put 500kg of causticizing white mud slag and 75kg of fly ash into the mixer and stir for 2 to 3 minutes. When the mixture is in a uniform state, add 25kg of burnt clay and continue stirring for 1 to 2 minutes. The mixture is uniformly mixed;

[0046] Step 2: Transfer the prepared mixture into the ball forming equipment, turn it into a ball cylinder (ball plate) at a certain speed, and gradually add 25kg of burnt clay into the cylinder, and turn it into a ball cylinder for 6 to 8 minutes At this time, a sphere with a diameter of 10-30mm can be formed in the cylinder, and the material sphere has a certain initial strength (judged according to its free fall from a height of 1m without breaking);

[0047] Step 3: Naturally stack and maintain the balls obtained in the second step for...

Embodiment 2

[0051] to combine figure 2 , the method for preparing hydraulic calcium oxide from causticized lime mud by papermaking alkali of the present invention comprises the following steps:

[0052] Step 1: Put 500kg of causticizing white mud slag and 50kg of fly ash into the mixer and stir for 2 to 3 minutes. When the mixture is in a uniform state, add 50kg of burnt clay and continue stirring for 1 to 2 minutes. The mixture is uniformly mixed;

[0053] The second step: transfer the prepared mixture into the ball forming equipment, turn it into a ball tube (ball plate) at a certain speed, and gradually add 25kg of fly ash into the tube, and the rotation time of the ball tube is 6-8 In minutes, a sphere with a diameter of 10-30mm can be formed in the cylinder, and the material sphere has a certain initial strength (the initial strength can be judged according to its free fall from a height of 1m without breaking);

[0054] Step 3: Naturally stack and maintain the balls obtained in t...

Embodiment 3

[0058] to combine image 3 , the method for preparing hydraulic calcium oxide from causticized lime mud by papermaking alkali of the present invention comprises the following steps:

[0059] Step 1: Put 500kg of causticizing white mud slag and 50kg of fly ash into the mixer and stir for 2 to 3 minutes. When the mixture is in a uniform state, add 50kg of burnt clay and continue stirring for 1 to 2 minutes. The mixture is uniformly mixed;

[0060] Step 2: Transfer the white mud and slag mixture to the concrete block forming machine, vibrate and press to form, and place the formed body on the test block pallet for natural curing, and transport it to the storage yard after it has a certain initial compressive strength carry out natural conservation;

[0061] Step 3: Naturally stack and maintain the test pieces obtained in the second step for 7 to 14 days until the quality of the adobe is basically no longer reduced, and the compressive strength of the adobe exceeds 1MPa, which c...

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Abstract

The invention discloses a method for preparing hydraulic calcium oxide through papermaking alkali recycling causticized white sludge. The method comprises the following steps: preparing a mixture: putting papermaking causticized white sludge and pulverized fuel ash into a forced type stirrer for stirring, and putting burnt clay into the forced type stirrer for evenly stirring to obtain the mixture; molding the mixture: molding by adopting a centrifugal rolling balling method or shaking pressurization method; naturally curing the mixture: putting the molded mixture balls into the natural environment with good ventilation conditions for stacking and curing, and putting adobes into the natural environment with good ventilation conditions for stacking and curing for 7-14 days until the quality of the adobes can not be further reduced and the primary compression strength of the adobes is more than 1MPa; and calcining the material: conveying the cured and dried material balls or adobes intoa shaft kiln for calcining and insulating, then naturally cooling to the room temperature, and milling the calcined products to be used for preparing silicate products. The invention reduces the dustpollution and solves the problem of treatment of pulverized fuel ash.

Description

technical field [0001] The invention belongs to the field of resource utilization of inorganic solid waste, in particular to a method for preparing new building materials by using industrial waste slag from papermaking causticization white mud. Background technique [0002] my country is a big country in pulping and papermaking. At present, the chemical pulping method is used. Chemical pulping is to use various chemical agents to dissolve most of the lignin in the plant fiber raw materials under specific conditions to disperse it into pulp. In summary, it can be divided into two categories: caustic soda pulping and sulfite pulping. Soda pulping is mainly used to produce some grass pulp, such as rice straw, asparagus, reed and so on. Kraft pulping is mainly used to produce wood pulp, and is also used to make bamboo pulp and straw pulp. With the chemical pulping method, no matter what kind of raw materials are used to make paper, black liquor will be produced. Black liquor c...

Claims

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Application Information

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IPC IPC(8): C04B18/30
CPCY02W30/91
Inventor 崔崇江金国丁锡锋张士华陈光孙章鳌崔晓昱
Owner NANJING UNIV OF SCI & TECH
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