阅读说明：本技术 一种高性能水处理剂用铝酸钙的生产方法 (Production method of calcium aluminate for high-performance water treatment agent ) 是由 白明科 李海宏 赵健 王红升 杨国开 王亚锋 黄增 于 2018-06-26 设计创作，主要内容包括：本发明提供一种使用大型干法水泥回转窑烧结法生产高性能水处理剂用铝酸钙的方法。原料为铝矾土、石灰石,两者质量比为45～70∶55～30,包括如下步骤：(1)将原料破碎,粉磨混合均匀,得生料；(2)投入生料通过大型干法水泥回转窑煅烧,烧结成熟料后,粉磨成水处理剂用铝酸钙。本发明使用大型干法水泥回转窑生产铝酸钙克服了“结圈”、“结球”、“结皮”等对现有生产工艺和设备的限制,避免窑耐火材料损坏及窑运转周期缩短等不良工艺,降低能源消耗和生产成本,提高生产效率,提高产品产量和品质。(The invention provides a method for producing calcium aluminate for a high-performance water treatment agent by using a large-scale dry-process rotary cement kiln sintering method. The method is characterized in that bauxite and limestone are used as raw materials, the mass ratio of the bauxite to the limestone is 45-70: 55-30, and the method comprises the following steps: (1) crushing the raw materials, grinding and uniformly mixing to obtain raw materials; (2) the raw materials are put into a large dry cement rotary kiln to be calcined and sintered into clinker, and then the clinker is ground into calcium aluminate used as a water treatment agent. The invention uses the large-scale dry-method cement rotary kiln to produce the calcium aluminate, overcomes the limitations of ring formation, ball formation, crust formation and the like on the existing production process and equipment, avoids the bad processes of kiln refractory material damage, kiln operation cycle shortening and the like, reduces energy consumption and production cost, improves production efficiency and improves product yield and quality.)

1. A method for producing calcium aluminate for a high-performance water treatment agent by using a large-scale dry-method cement rotary kiln sintering method is characterized by comprising the following steps:

(1) crushing the raw materials, grinding and uniformly mixing to obtain raw materials;

(2) the raw material is added into a large dry cement rotary kiln, sintered into clinker, and then ground into calcium aluminate.

2. The method for producing the calcium aluminate for the high-performance water treatment agent by using the large dry cement rotary kiln sintering method according to claim 1, wherein the raw materials in the step (1) are bauxite and limestone, the mass ratio of the bauxite to the limestone is 50-65: 50-35, and the mass percentage of alumina in the bauxite is 45-75%.

3. The method for producing calcium aluminate for high-performance water treatment agent by using large-scale dry cement rotary kiln sintering method according to claim 1, wherein the large-scale dry cement rotary kiln in the step (2) is a large-scale dry cement rotary kilnOr other rotary kilns of the same specification.

4. The method for producing the calcium aluminate for the high-performance water treatment agent by using the large-scale dry-process rotary cement kiln sintering method according to claim 1, wherein the feeding amount in the step (2) is 140-180 t/h.

5. The method for producing the calcium aluminate for the high-performance water treatment agent by using the large-scale dry-method cement rotary kiln sintering method according to claim 1, wherein the outlet temperature of the primary cyclone in the step (2) is 250-350 ℃, and the pressure is-3000 to-5000 Pa.

6. The method for producing the calcium aluminate for the high-performance water treatment agent by using the large-scale dry-method cement rotary kiln sintering method according to claim 1, wherein the outlet temperature of the decomposing furnace in the step (2) is 750-850 ℃, and the pressure is-700 to-1200 Pa.

7. The method for producing the calcium aluminate for the high-performance water treatment agent by using the large-scale dry-method cement rotary kiln sintering method according to claim 1, wherein the outlet temperature of the five-stage cyclone in the step (2) is 750-850 ℃ and the pressure is-900-1300 Pa.

8. The method for producing the calcium aluminate for the high-performance water treatment agent by using the large-scale dry-method rotary cement kiln sintering method according to claim 1, wherein the temperature of the five-level discharging pipe in the step (2) is 700-900 ℃.

9. The method for producing the calcium aluminate for the high-performance water treatment agent by using the large-scale dry-method cement rotary kiln sintering method according to claim 1, wherein the temperature of the kiln tail in the step (2) is 900-1200 ℃, and the pressure of the kiln tail is-100 to-400 Pa.

10. The method for producing the calcium aluminate for the high-performance water treatment agent by using the large-scale dry-method cement rotary kiln sintering method according to claim 1, wherein the negative pressure of the kiln head in the step (2) is-100 to 0Pa, and the secondary air temperature is 750 to 1200 ℃.

11. The method for producing the calcium aluminate for the high-performance water treatment agent by using the large-scale dry-method cement rotary kiln sintering method according to claim 1, wherein the amount ratio of the head coal to the tail coal in the step (2) is 65-75% to 35-25%.

12. The method for producing calcium aluminate for high-performance water treatment agents by using a large-scale dry cement rotary kiln sintering method according to claim 1, wherein the decomposition rate of the kiln raw material in the step (2) is 80-95%.

13. The method for producing the calcium aluminate for the high-performance water treatment agent by using the large-scale dry-method rotary cement kiln sintering method according to claim 1, wherein the vertical lifting weight of the clinker in the step (2) is 700-1000 g/L.

14. The method for producing calcium aluminate for high-performance water treatment agent by using large-scale dry cement rotary kiln sintering method according to claim 1, wherein the pressure of the air chamber in the zero pressure point of the grate cooler in the step (2): the air chamber pressure of the first chamber cooling fan is 4-7 KPa, the air chamber pressure of the second chamber cooling fan is 3-6 KPa, the air chamber pressure of the third chamber cooling fan is 2-4 KPa, and the air chamber pressure of the fourth chamber cooling fan is 2-5 KPa.

Technical Field

The invention relates to a method for producing calcium aluminate for a high-performance water treatment agent, in particular to a method for producing calcium aluminate for a high-performance water treatment agent by using a large-scale dry cement rotary kiln sintering method.

Background

The calcium aluminate is a raw material of a grey white powdery water purifying agent, and the main components of the calcium aluminate are CaO and Al₂O₃、Fe₂O₃The method is mainly used for producing water-treated aluminum salt products such as polyaluminium chloride, aluminum sulfate, sodium aluminate and the like, can also be used for adjusting the alkalization degree, and can also be used for refractory materials. The calcium aluminate is slightly soluble in water, the aqueous solution is alkaline, the pH value is about 11, the calcium aluminate and the inorganic strong acid have high reaction activity, can react at normal temperature, and has large heat release amount, quick temperature rise and dissolution rate of alumina of over 90 percent. The acid dissolution one-step method for producing the water purifying agent by calcium aluminate can save a great deal of manpower and electric power, greatly reduce the cost, improve the product quality, have the advantages of simple process equipment, easy mastering and the like, and is an ideal raw material for producing the water purifying agent products such as basic aluminum chloride, polyaluminum chloride and the like at present. The production of calcium aluminate adopts bauxite and limestone as raw materials, the bauxite belongs to non-renewable resources, the reserves of the bauxite are limited, the exploitation cost is increased continuously along with the continuous reduction of the reserves, and the price is increased continuously, so the production cost of the calcium aluminate is also increased continuously, and the problem of how to produce the calcium aluminate with high efficiency, low cost and high quality is urgently needed to be solved.

At present, the sintering process in the production of calcium aluminate is mainly a rotary kiln sintering method. When the rotary kiln works, part of raw materials, ash generated by raw coal which is not completely combusted and impurities with low melting point in limestone are sintered together, and are continuously rolled to form large blocks which are solidified on the inner wall of the rotary kiln to form 'ring formation'. The ring formation causes the uneven material layer of the rotary kiln, so that the effective cross-sectional area in the kiln is reduced, the system resistance of the rotary kiln is increased, the ventilation in the kiln is seriously influenced, the movement of materials is hindered, and the working efficiency of the rotary kiln is reduced. Therefore, the conventional treatment method is to prepare a ring making machine on site, and once the ring is formed, the production is recovered after the ring is closed and the kiln is stopped, so that the adverse process accidents of high production cost, serious damage to the refractory material of the kiln, short kiln operation period and the like are caused.

Disclosure of Invention

The invention aims to provide a method for producing calcium aluminate for a high-performance water treatment agent, in particular to a method for producing the calcium aluminate for the high-performance water treatment agent by using a large-scale dry-method cement rotary kiln sintering method, which solves the defects of the prior art, avoids the occurrence of ring formation, does not use a ring cleaning device, reduces the production cost, improves the production efficiency, improves the product yield and quality, produces the calcium aluminate for the water treatment agent which is superior to the national standard, and has no production example at home at present.

The technical scheme adopted by the invention is as follows:

(1) crushing the raw materials, grinding and uniformly mixing to obtain raw materials;

(2) the raw material is added into a large dry cement rotary kiln, sintered into clinker, and then ground into calcium aluminate.

The raw materials are bauxite and limestone, and the mass ratio of the bauxite to the limestone is 50-65: 50-35.

The mass percentage of the alumina in the bauxite is 45-75%.

The large-scale dry-method cement rotary kiln comprises

Or other rotary kilns of the same specification.

Preferably, the inclination of the rotary kiln is 3.5%.

The rotary kiln is provided with five-stage cyclone cylinders, the first-to-fifth-stage cyclone cylinders are sequentially connected in series, the outlet of the five-stage cyclone cylinder is connected with the inlet of the decomposing furnace, and the outlet of the decomposing furnace is connected with the kiln tail of the rotary kiln.

When the device works, raw materials are fed from the feeding ports on the connecting pipelines of the second stage and the first stage, the heat exchange between the raw materials and hot gas is fully carried out under the action of the multistage cyclone cylinders, the temperature of the raw materials is increased, the raw materials finally enter the decomposing furnace from the feeding pipe of the five-stage cyclone cylinder to decompose limestone, and the decomposed limestone and bauxite enter the rotary kiln together for sintering.

Further, the feeding amount is 140-180 t/h;

furthermore, the outlet temperature of the primary cyclone cylinder is 250-350 ℃, and the pressure is-3000 to-5000 Pa;

further, the outlet temperature of the decomposing furnace is 750-850 ℃, and the pressure is-700 to-1200 Pa;

furthermore, the outlet temperature of the five-stage cyclone is 750-850 ℃ and the pressure is-900 to-1300 Pa;

further, the temperature of the five-level blanking pipe ranges from 700 ℃ to 900 ℃;

furthermore, the temperature of the kiln tail is 900-1200 ℃, and the pressure of the kiln tail is-100 to-400 Pa;

further, the negative pressure of the kiln head is-100-0 Pa, and the secondary air temperature is 750-1200 ℃;

further, the proportion of the amount of the head coal and the tail coal is 65-75%: 35-25%;

furthermore, the decomposition rate of the raw materials entering the kiln is 80-95 percent;

further, controlling the vertical lifting weight of the clinker to be 700-1000 g/L;

further, the plenum pressure within the zero pressure point of the grate cooler is: the air chamber pressure of the first chamber cooling fan is 4-7 KPa, the air chamber pressure of the second chamber cooling fan is 3-6 KPa, the air chamber pressure of the third chamber cooling fan is 2-4 KPa, and the air chamber pressure of the fourth chamber cooling fan is 2-5 KPa.

The invention has the beneficial effects that: the calcium aluminate is produced by a large-scale dry-method cement rotary kiln sintering method, so that the heat consumption and the power consumption of the product are reduced, and the production organization is convenient. The large-scale dry-method cement rotary kiln has complete facilities, and the calcium aluminate produced by the method can ensure good uniformity, stable quality and excellent quality of the produced product. The optimization of the process operation and the process parameters reduces the arching force of ring formation, avoids the ring formation, does not need to use a ring cleaning device, does not need to stop the rotary kiln for manual cleaning, reduces the labor cost and simultaneously improves the working efficiency of the rotary kiln.

Drawings

FIG. 1 is a schematic diagram of calcium aluminate for producing high-performance water treatment agent by a large-scale dry-process rotary cement kiln sintering method;

figure 2 is a schematic diagram of a large dry-process cement rotary kiln structure,

wherein: 1-first-stage cyclone cylinder, 2-second-stage cyclone cylinder, 3-third-stage cyclone cylinder, 4-fourth-stage cyclone cylinder, 5-fifth-stage cyclone cylinder, 6-decomposing furnace, 7-rotary kiln, 8-feeding opening, 9-coal-spraying pipe and 10-hot air for decomposing furnace.

Detailed Description

The present invention will be further described with reference to the accompanying drawings 1-2 and the embodiments, but is not limited thereto.