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Production method for lightweight concrete product based on desulfurization of calcium carbide residues

A technology of lightweight concrete and production method, applied in separation methods, chemical instruments and methods, gas treatment and other directions, can solve problems such as environmental pollution, and achieve the effects of stable operation and high flue gas desulfurization efficiency

Inactive Publication Date: 2018-03-30
中晶蓝实业集团有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, it can also solve the environmental pollution caused by a large amount of accumulation of calcium carbide slag

Method used

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  • Production method for lightweight concrete product based on desulfurization of calcium carbide residues
  • Production method for lightweight concrete product based on desulfurization of calcium carbide residues
  • Production method for lightweight concrete product based on desulfurization of calcium carbide residues

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0060] (1) Modulation of desulfurizer composition:

[0061] Mix the components evenly according to the following formula to obtain the desulfurizer composition.

[0062] Magnesium oxide (MgO): wherein the active magnesium oxide content is 70wt% 40 parts by weight

[0063] Carbide slag: (fineness 200 mesh, sieving rate greater than 95%) 60 parts by weight

[0064] (2) Production process of lightweight concrete products:

[0065] 1. Pulping:

[0066] The prepared desulfurizer composition is added to industrial alkaline water (from a chemical plant, its pH is about 10) for pulping and aging to form a desulfurizer slurry, which is kept in a slurry tank for later use.

[0067] 2. Desulfurization:

[0068] The sulfur dioxide in the flue gas reacts with the desulfurizer slurry in the desulfurization tower to remove the sulfur dioxide in the flue gas. When the pH of the slurry formed after desulfurization is 6.5, discharge the desulfurized slurry and store it in the discharge slu...

Embodiment 2

[0075] Lightweight concrete products were produced in the same manner as in Example 1 except that the following steps or recipes were used.

[0076] Mix the components evenly according to the following formula to obtain the desulfurizer composition.

[0077] Magnesium oxide (MgO): wherein the active magnesium oxide content is 70wt% 50 parts by weight

[0078] Carbide slag: (fineness 200 mesh, sieving rate greater than 95%, pH 12) 50 parts by weight

[0079] In parts by weight, add 100 parts of coal gangue (particle size 7mm), 50 parts of construction waste powder, 50 parts of fly ash, 150 parts of desulfurization slurry, 60 parts of magnesium oxide and 2 parts of dihydrogen phosphate into the mixer for forced stirring for 20 Minutes, wherein the main particle size of the granular material is less than 10mm.

[0080] The desulfurization effect of Example 2 is shown in Table 2, and the performance test results of the lightweight concrete products produced in Example 2 are show...

Embodiment 3

[0082] Lightweight concrete products were produced in the same manner as in Example 1 except that the following steps or recipes were used.

[0083] Mix the components evenly according to the following formula to obtain the desulfurizer composition.

[0084] Magnesium oxide (MgO): wherein the content of active magnesium oxide is 70wt% 45 parts by weight

[0085] Carbide slag: (fineness 200 mesh, sieving rate greater than 95%, pH 11) 55 parts by weight

[0086]In parts by weight, add 110 parts of shale ceramsite (particle size 6mm), 50 parts of construction waste powder, 60 parts of fly ash, 160 parts of desulfurization slurry, 65 parts of magnesium oxide and 3 parts of dihydrogen phosphate into the mixer to force Stir for 15 minutes, wherein the main particle size of the granular material is less than 10mm.

[0087] The desulfurization effect of Example 3 is shown in Table 2, and the performance test results of the lightweight concrete products of Example 3 are shown in Tabl...

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Abstract

The invention discloses a production method for a lightweight concrete product based on desulfurization of calcium carbide residues. The method comprises the following steps: adding a desulfurizing agent composition into industrial alkaline waste water to prepare a desulfurizing agent slurry, wherein the desulfurizing agent composition is composed of 40-80 parts by weight of the calcium carbide residues and 20-60 parts by weight of magnesium oxide, the pH value of the calcium carbide residues is 10-12, and the active magnesium oxide content of the magnesium oxide is 60wt% or more; enabling thedesulfurizing agent slurry to be contacted with flue gases with a sulfur dioxide concentration of 3000mg / Nm<3> or less to form an absorption slurry, and when the pH of the absorption slurry is 5.3-6.8, discharging the slurry to obtain a desulfurizing slurry material; mixing raw materials including 50-150 parts by weight of industrial solid waste, 100-300 parts by weight of the desulfurizing slurry material and 80-100 parts by weight of lightweight aggregate to obtain a mixed material, wherein the particle size of the lightweight aggregate is 10mm or less; and performing molding on the obtained mixed material in a molding die, and performing maintenance under the temperature of 20-60 DEG C and the humidity of 50-100%. The method disclosed by the invention can obtain the high-quality lightweight concrete product at lower costs while performing high-efficiency desulfurization.

Description

technical field [0001] The invention relates to a production method of lightweight concrete products, in particular to a production method of lightweight concrete products based on calcium carbide slag desulfurization. Background technique [0002] With the rapid development of the economy, the amount of industrial waste is also increasing day by day. In 2013, the national industrial waste generation was 1.34 billion tons, an increase of 12% over 2012 and nearly 30% over 2010; industrial solid waste discharge was 16.547 million tons, a decrease of 6.1% over 2012. The comprehensive utilization of industrial solid waste is only 770 million tons, and the comprehensive utilization of industrial solid waste in my country is still limited to primary extensive utilization, such as paving roads, producing cement building materials, and filling mines. Compared with foreign countries, the level of recycling of industrial solid waste in my country is also low. For example, the total r...

Claims

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Application Information

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IPC IPC(8): C04B28/32B01D53/50B01D53/80C04B111/76
CPCC04B28/32B01D53/502B01D53/80B01D2258/0283C04B2111/76C04B2201/50C04B18/062C04B18/027C04B18/08C04B22/16C04B18/12C04B18/16
Inventor 童裳慧
Owner 中晶蓝实业集团有限公司