Preparation process of dolomite sand

A technique for preparing dolomite sand and a preparation process, which is applied in the field of preparation technology for dolomite sand, can solve the problems of complicated preparation process, high production cost, and high raw material consumption, and achieve simplified preparation process, reduced consumption of raw materials and fuel, and improved preparation process high quality effect

Active Publication Date: 2015-10-21
大石桥市大岭天成耐火材料有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The existing dolomite sand preparation process usually adopts a two-step calcination method, and the preparation process is complicated. In addition, due to the large consumption of raw materials and fuel consumption in the preparation process, the production cost is very high

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0010] The preparation technology of dolomite sand adopts the following steps:

[0011] (1) Select dolomite with a particle size of 10-80mm, and the index of the dolomite according to the weight of the chemical composition is: SiO 2 0.29, Fe 2 o 3 0.1, Al 2 o 3 0.15, CaO30.06, MgO22.7, subtract 46.7;

[0012] (2) Calcination is carried out in a high-temperature shaft kiln using low-ash powder white coal as fuel. The calcination temperature is 1750°C, and intermittent oxidation-enriched calcination is adopted. The calcination is carried out once every 4 hours, and the number of times of entering and exiting the kiln is 6 times;

[0013] (3) The index of the calcined dolomite sand is according to the weight part of the chemical composition: SiO 2 1.11, Fe 2 o 3 0.56, Al 2 o 3 0.45, CaO 56.94, MgO 39.93, reduced by 0.28, body density 3.2.

Embodiment 2

[0015] The preparation technology of dolomite sand adopts the following steps:

[0016] (1) Select dolomite with a particle size of 10-80mm, and the index of the dolomite according to the weight of the chemical composition is: SiO 2 0.34, Fe 2 o 3 0.18, Al 2 o 3 0.21, CaO32.14, MgO23.6, reduced by 43.53;

[0017] (2) Calcination is carried out in a high-temperature shaft kiln using low-ash powder white coal as fuel. The calcination temperature is 1850°C, and intermittent oxidation-enriched calcination is used. The calcination takes 6 hours to leave the kiln once, and the number of times to enter and exit the kiln is 4 times;

[0018] (3) The index of the calcined dolomite sand is according to the weight part of the chemical composition: SiO 2 1.13, Fe 2 o 3 0.58, Al 2 o 3 0.61, CaO 57.22, MgO 40.08, reduced by 0.38, body density 3.4.

Embodiment 3

[0020] The preparation technology of dolomite sand adopts the following steps:

[0021] (1) Select dolomite with a particle size of 10-80mm, and the index of the dolomite according to the weight of the chemical composition is: SiO 2 0.29, Fe 2 o 3 0.1,Al 2 o 3 0.15, CaO30.06, MgO22.7, subtract 46.7;

[0022] (2) Calcination is carried out in a high-temperature shaft kiln using low-ash powder white coal as fuel. The calcination temperature is 1800°C, and intermittent oxidation-enriched calcination is adopted. The kiln is fired once every 5 hours, and the number of times of entering and exiting the kiln is 5 times;

[0023] (3) The index of the calcined dolomite sand is according to the weight part of the chemical composition: SiO 2 1.18, Fe 2 o 3 0.6, Al 2 o 3 0.64, CaO 57.67, MgO 40.21, reduced by 0.43, body density 3.25.

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Abstract

The invention provides a preparation technology of dolomite sand, which comprises the following steps: (1) dolomite with the particle size of 10-80 mm is selected, wherein the dolomite comprises the following chemical components in parts by weight: larger than or equal to 0.29 part of SiO2, larger than or equal to 0.1 part of Fe2O3, larger than or equal to 0.15 part of Al2O3, larger than or equal to 30.06 parts of CaO, and larger than or equal to 22.7 parts of MgO, in addition, the dolomite is cut down for 40-50 according to the circumference, (2) low-ash hard coal is adopted as fuels to be calcinated in a high temperature shaft kiln, wherein the calcinating temperature is 1,750-1,850 DEG C; an intermittent oxygen-enriched calcination way is adopted, wherein one-time drawing out of the kiln is carried out in calcinating for 4-6 hours, and the times of entering in and drawing out of the kiln is 4-6; (3) the calcinated dolomite sand comprises the chemical components in parts by weight: 1.11-1.18 parts of SiO2, 0.56-0.6 part of Fe2O3, 0.45-0.64 part of Al2O3, 56.94-57.67 parts of CaO, and 39.93-40.21 parts of MgO, in addition, the calcinated dolomite sand is cut down for 0.28-0.43 according to the circumference, and has volume density of higher than or equal to 3.2. The dolomite sand is manufactured by one-step calcinating, and on one hand, the consumption of raw materials and fuels are enabled to be remarkably reduced, on the other hand, the preparation technology is greatly simplified, therefore, the production cost is lowered greatly.

Description

technical field [0001] The invention relates to a preparation process of dolomite sand and belongs to the technical field of refractory materials. Background technique [0002] Dolomite sand is the raw material for refractory products necessary for refining steel such as VOD and AOD furnaces in the steelmaking industry. The existing dolomite sand preparation process usually adopts a two-step calcination method, and the preparation process is complicated. In addition, due to the large consumption of raw materials and fuel consumption in the preparation process, the production cost is high. Contents of the invention [0003] For above deficiency, the purpose of this invention is to provide a kind of preparation technology of dolomite sand. [0004] Technical scheme of the present invention: the preparation technology of dolomite sand adopts the following steps: [0005] (1) Select dolomite with a particle size of 10-80mm, and the index of the dolomite according to the wei...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/66
Inventor 王景范王晓东尹德柱
Owner 大石桥市大岭天成耐火材料有限公司
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