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A calcium carbonate decomposition accelerator

A decomposition accelerator, calcium carbonate technology, applied in the direction of separation methods, dispersed particle separation, chemical instruments and methods, etc., can solve the problems of limited application, impossibility of rotary kiln application, and high cost of addition, so as to improve decomposition efficiency and solid Sulfur effect, effect of good social benefits

Active Publication Date: 2018-12-11
CNOOC TIANJIN CHEM RES & DESIGN INST +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the incorporation of mineralizers may cause skinning and blockage of the cyclone preheater and calciner, which limits its application range. It is only suitable for shaft kilns and cannot be applied to rotary kilns that are currently widely used.
At the same time, its addition amount is relatively high (1%-5%), resulting in high addition cost and limited application

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] Embodiment one: the calcium carbonate decomposition accelerator comprises 3.5% potassium nitrate, 5% sodium nitrate, 12% water glass, 3% alkylphenol polyoxyethylene ether (APEO), and the balance is water by weight percentage, It is mixed into calcium carbonate and used in cement clinker production. Compared with no accelerator, the decomposition rate of calcium carbonate is increased from 98.2% to 98.6%, the power consumption of coal mill is reduced by 300 degrees / day, and the outlet temperature of calciner is increased from 900℃ Up to 908°C, all indicators of clinker (3-day strength, 28-day strength, three-rate value, etc.) remain stable.

Embodiment 2

[0014] Embodiment two: the calcium carbonate decomposition accelerator comprises 7.5% potassium nitrate, 0.1% sodium nitrate, 14% water glass, 5% fatty alcohol polyoxyethylene ether (AEO), and the balance is water, mixed in In pulverized coal, it is applied to the desulfurization of power plant boilers by spraying calcium in the furnace. Compared with no accelerator, the concentration of sulfur dioxide at the outlet of the flue gas is increased from 380mg / m 3 down to 350mg / m 3 , The desulfurization efficiency increased from 90% to 90.8%. At the same time, after adding the accelerator, the energy consumption of calcium carbonate decomposition was reduced, resulting in an increase in boiler output, which played a certain coal-saving effect. The calculated coal-saving rate was 3.5%.

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Abstract

The invention discloses a calcium carbonate decomposing accelerant. The calcium carbonate decomposing accelerant is prepared from the following components in percentage by weight: 0.1 to 10% of potassium nitrate, 0.1 to 5% of sodium nitrate, 0.1 to 15% of water glass, 3 to 12% of penetrant and the balance of water. The calcium carbonate decomposing accelerant has the advantage that by adding a small amount of the accelerant into a limestone / cement raw material, the decomposing efficiency of calcium carbonate is obviously improved, so that the production energy consumption is decreased.

Description

technical field [0001] The invention belongs to the field of additives, and in particular relates to a calcium carbonate decomposition accelerator used in cement production or calcium spray desulfurization technology in a furnace. Background technique [0002] Calcium carbonate decomposition occupies a very important position in the cement industry and desulfurization technology. Whether it is pre-decomposition of cement raw materials outside the kiln or flue gas desulfurization of power plant boilers, the main reaction in the production process is CaCO 3 decomposition. For the cement industry, CaCO 3 The decomposition will directly affect the quality of cement clinker. For flue gas desulfurization, the activity of desulfurizer and the final desulfurization effect also depend on CaCO 3 of the decomposition. [0003] The decomposition reaction of calcium carbonate is a strong endothermic process with high energy consumption and incomplete decomposition. Although the exist...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B7/42B01D53/48B01D53/81
CPCB01D53/48B01D53/81B01D2251/404B01D2251/606B01D2258/0283C04B7/428
Inventor 王翔于海斌孙彦民曲晓龙钟读乐侯洁苹张燕陈楠张雪梅
Owner CNOOC TIANJIN CHEM RES & DESIGN INST