阅读说明：本技术 一种氢氧化铝焙烧电收尘粉制备纯铝酸钙水泥的方法 (Method for preparing pure calcium aluminate cement by baking electrical dust collection powder with aluminum hydroxide ) 是由 李太昌 陈洪德 王庆玲 于海艳 于 2019-11-22 设计创作，主要内容包括：本发明公开了一种氢氧化铝焙烧电收尘粉制备纯铝酸钙水泥的方法,该方法包括：1)将氢氧化铝焙烧电收尘粉筛分除杂,并对筛下物料均化处理；2)按铝酸钙配方要求配比分别称取电收尘粉、轻质碳酸钙研磨25-32小时,把两种磨细物料混合均匀；3)将磨细混匀原料装入糖衣机里加入5‰-5.5‰桃胶水溶液滚动成球；4)球状物盛在匣钵里,在1450℃-1700℃温度下烧成2-8小时；5)烧成后物料经冷却破碎研磨成细粉。采用本发明方法可制出符合铝酸盐水泥GB/T201-2015国家标准的纯铝酸钙水泥产品。本发明方法将氢氧化铝焙烧电收尘粉用于高级耐火材料生产中,能降低纯铝酸钙水泥生产成本,提高冶金级氧化铝品质。(The invention discloses a method for preparing pure calcium aluminate cement by using aluminum hydroxide roasting electric dust collection powder, which comprises the steps of 1) screening the aluminum hydroxide roasting electric dust collection powder to remove impurities and homogenizing undersize materials, 2) weighing the electric dust collection powder and light calcium carbonate respectively according to the formula requirement of calcium aluminate, grinding for 25-32 hours, mixing the two ground materials uniformly, 3) putting the ground and uniformly mixed raw materials into a sugar coating machine, adding 5-5.5 thousandths of peach gum aqueous solution, rolling to form balls, 4) putting the balls into a sagger, sintering at 1450-1700 ℃ for 2-8 hours, and 5) cooling, crushing and grinding the sintered materials into fine powder.)

1, A method for preparing pure calcium aluminate cement by baking electric dust collection powder with aluminum hydroxide, which is characterized in that the method comprises the following steps:

(1) screening electric dust collection powder in the process of producing alumina by boiling and roasting aluminum hydroxide to remove impurities, and homogenizing undersize materials;

(2) respectively weighing the electric dust collection powder and the light calcium carbonate according to the proportion required by the formula of the generated calcium aluminate, grinding for 25-32 hours, wherein the ratio of balls to materials is 2: 1, and the average particle size of the ground materials is 4.8-5.2 μm; then uniformly mixing the two ground materials;

(3) loading the ground and uniformly mixed raw materials into a stainless steel sugar coating machine, adding 5-5.5% peach gum aqueous solution, and rolling into balls with the size of phi 30-10 mm;

(4) the ball is put in a sagger and sintered for 2 to 8 hours at the temperature of 1450 to 1700 ℃;

(5) the fired material is cooled, crushed, ground into fine powder and screened.

2. The method as claimed in claim 1, wherein the sieving in the step (5) is performed by using a square hole sieve with a fineness of 0.080mm, and the residue of the sieve is not more than 10%.

Technical Field

The invention relates to a technology for recycling aluminum hydroxide roasting dust, in particular to a method for preparing pure calcium aluminate cement from aluminum hydroxide roasting electric dust collection powder.

Background

In the process of boiling roasting of aluminum hydroxide, the aluminum hydroxide is preheated by hot air at 380 deg.C in a Venturi drier and then enters a preheating cyclone cylinder for classification under the action of centrifugal force, coarse powder enters a main roasting system, fine powder is collected by an electric dust collector and then is sent to a -grade cyclone cooler, and the fine powder is preheated and mixed into a finished product at 542 deg.C.

Industrial high-purity calcium aluminate cement is generally obtained by using industrial alumina as a raw material, matching with high-quality lime or light calcium carbonate, sintering in a high-temperature down-draft kiln or sintering in a rotary kiln or melting in an electric arc furnace, and has high production cost.

Disclosure of Invention

The invention aims to provide a method for preparing pure calcium aluminate cement by using aluminum hydroxide roasting electric dust collection powder, aiming at the defects of the prior art, so that the synthesis cost of the pure calcium aluminate cement is reduced, and the quality and the service performance of metallurgical-grade aluminum oxide products are improved.

The invention adopts the following technical scheme:

method for preparing pure calcium aluminate cement by roasting electric dust collection powder with aluminum hydroxide, which is characterized by comprising the following steps:

(1) screening electric dust collection powder in the process of producing alumina by boiling and roasting aluminum hydroxide to remove impurities, and homogenizing undersize materials;

(2) respectively weighing the electric dust collection powder and the light calcium carbonate according to the proportion required by the formula of the generated calcium aluminate, grinding for 25-32 hours, wherein the ratio of balls to materials is 2: 1, and the average particle size of the ground materials is 4.8-5.2 μm; then uniformly mixing the two ground materials;

(3) loading the ground and uniformly mixed raw materials into a stainless steel sugar coating machine, adding 5-5.5% peach gum aqueous solution, and rolling into balls with the size of phi 30-10 mm;

(4) the ball is put in a sagger and sintered for 2 to 8 hours at the temperature of 1450 to 1700 ℃;

(5) the fired material is cooled, crushed, ground into fine powder and screened.

Preferably, the sieving in the step (5) is to use a square hole sieve with the fineness of 0.080mm, and the residue of the sieve is not more than 10 percent.

The method has the beneficial effects that the electric dust-collecting powder is separated from the alumina production flow in the process of producing alumina by boiling roasting of aluminum hydroxide, the chemical purity of metallurgical-grade alumina is improved, the physical performance indexes such as the fluidity and the granularity of an alumina product are improved, the quality of metallurgical-grade alumina is improved, and energy conservation and consumption reduction of aluminum electrolysis enterprises are facilitated.

Drawings

FIG. 1 is a process flow diagram of the present invention.

Detailed Description

Referring to fig. 1, A method for preparing pure calcium aluminate cement by roasting electric dust collection powder with aluminum hydroxide is characterized by comprising the following steps:

(1) screening electric dust collection powder by a vibration screening machine to remove impurities in the process of producing alumina by boiling roasting of aluminum hydroxide, and homogenizing undersize materials;

(2) weighing electric dust collection powder and light calcium carbonate according to the proportion required by the formula of the generated calcium aluminate, and grinding the electric dust collection powder and the light calcium carbonate in a dry ceramic lining ball mill for 25 to 32 hours respectively, wherein the ratio of balls to materials is 2: 1, and the average particle size of the ground materials is 4.8 to 5.2 mu m; then uniformly mixing the two ground raw materials in a mixer;

(3) loading the ground and uniformly mixed raw materials into a stainless steel sugar coating machine, adding 5-5.5% peach gum aqueous solution, and rolling into balls with the size of phi 30-10 mm;

(4) the ball-shaped objects are put into a sagger and put into a 1600 ℃ high-temperature box furnace or an 1800 ℃ ultra-high temperature gas kiln which takes a silicon-molybdenum rod as a heating element, and high-temperature sintering is carried out for 2 to 8 hours at the temperature of 1450 to 1700 ℃;

(5) after the fired material is cooled, the material is crushed by a jaw crusher, ground by a dry ceramic lining ball mill and sieved. Preferably, the screen residue of the square-hole screen with the fineness of 0.080mm cannot exceed 10 percent.