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Device and method for dry and energy-saving production of polyaluminum chloride water purifying agent

A technology of polyaluminum chloride and water purifying agent, applied in the direction of aluminum chloride, dry gas arrangement, aluminum halide, etc., can solve the problems of too high requirements, no secondary utilization of flue gas, no secondary utilization, etc.

Active Publication Date: 2013-10-23
长沙天水环保科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, in my country's polyaluminum chloride industry, 75% of polyaluminum chloride products are produced by drum drying method, and 25% of polyaluminum chloride products are produced by spray drying method, but even if it is produced by spray drying method There is still room for energy saving, because at present, 90% of the enterprises that adopt the spray drying method in the country use chain furnaces as hot blast stoves. For many coal-deficient provinces in the south, the requirements are too high. The utilization rate of coal combustion is only about 85%, and the flue gas has not been used for secondary use. Around 105°C-120°C, the temperature of the dry tail gas has not been used for secondary use. The powder with 1%-3% in the tail gas is absorbed by cold water spraying, and it has not been effectively used after the absorption treatment.

Method used

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  • Device and method for dry and energy-saving production of polyaluminum chloride water purifying agent
  • Device and method for dry and energy-saving production of polyaluminum chloride water purifying agent

Examples

Experimental program
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Effect test

Embodiment 1

[0030] Using aluminum hydroxide, calcium aluminate and hydrochloric acid as raw materials, add 1000Kg of aluminum hydroxide, 4000kg of 31% hydrochloric acid and 2500kg of water into a 10000L enamel reaction kettle, react for 2 hours under 0.2MPa pressure, then cool down to 100℃, add 1000kg of calcium aluminate was reacted for another 1.5 hours, and then filtered to obtain liquid polyaluminum chloride with an alumina content of 13.5%. The liquid polyaluminum chloride with an alumina content of 13.5% is used as raw material for spray drying. The flue gas temperature at the outlet of the fluidized fluidized furnace is 750°C-800°C. After the second heat exchange, the flue gas temperature decreases by 100°C-120°C. After the second heat exchange, it is heated to 250°C-260°C as dry hot air. After the hot air passes through the drying tower to dry the material, the temperature of leaving the drying tower is 110°C-118°C. The tail gas at this temperature is used as the pre-drying concent...

Embodiment 2

[0032] Using aluminum hydroxide and hydrochloric acid as raw materials, add 3600Kg of aluminum hydroxide, 7600kg of 31% hydrochloric acid and 500kg of water in a 10000L enamel reaction kettle, react for 4 hours under a pressure of 0.4MPa, then cool down to 100°C, and filter to obtain the content of alumina It is 18.0% liquid polyaluminum chloride. The liquid polyaluminum chloride with an alumina content of 18.0% is used as raw material for spray drying. The flue gas temperature at the outlet of the fluidized fluidized furnace is 750°C-800°C. After the second heat exchange, the flue gas temperature decreases by 100°C-120°C. After the second heat exchange, it is heated to 230°C-240°C as dry hot air. After the hot air passes through the drying tower to dry the material, the temperature of leaving the drying tower is 105°C-110°C. The tail gas at this temperature is used as the pre-drying concentration tower. Hot air can increase the liquid polyaluminum chloride with alumina conten...

Embodiment 3

[0034] Using bauxite, calcium aluminate and hydrochloric acid as raw materials, add bauxite 2300kg, 31% hydrochloric acid 4000kg and water 2500kg in a 10000L reaction tank, react at 100°C for 3 hours, add calcium aluminate 1000kg, and then react for 1.5 hour, then filtered to obtain aluminum oxide content of 13.5% of the liquid polyaluminum chloride. The liquid polyaluminum chloride with an alumina content of 13.5% is used as raw material for spray drying. The flue gas temperature at the outlet of the fluidized fluidized furnace is 750°C-800°C. After the second heat exchange, the flue gas temperature decreases by 100°C-120°C. After the second heat exchange, it is heated to 250°C-260°C as dry hot air. After the hot air passes through the drying tower to dry the material, the temperature of leaving the drying tower is 110°C-118°C. The tail gas at this temperature is used as the pre-drying concentration tower. Hot air can increase the liquid polyaluminum chloride with alumina con...

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Abstract

The invention discloses a device and a method for dry and energy-saving production of polyaluminum chloride water purifying agent. A furnace in fluid bed is used for heat supply, high-temperature flue gas generated by the furnace in fluid bed at 750-800 DEG C and air at the room temperature are subjected to secondary serial heat exchange, an air heat exchanger is used for further heating preheated air preheated to 70-75 DEG C by an air preheater to be at a temperature higher than 230 DEG C, the high-temperature flue gas is cooled to 200-230 DEG C after heat exchange by the air heat exchanger, the air at the room temperature is preheated to 70-75 DEG C by the air preheater, and the exhaust temperature of the flue gas is lowered to 100-120 DEG C. Polyaluminum chloride liquid supposed to enter a drying tower is subjected to negative-pressure spray concentration by dry tail gas with 0.5%-1.0% of drying powder and at the temperature of 105-120 DEG C, the tail gas is cooled to 70-80 DEG C while the 0.5%-1.0% of drying powder contained in the tail gas is absorbed by the polyaluminum chloride liquid, and the tail gas is exhausted after gas-liquid separation in an acid mist absorbing tower is completed. Therefore, the yield of a spray drying tower can be increased by about 5%, and comprehensive standard coal consumption for production of solid polyaluminum chloride per ton can be reduced by 60-90kg.

Description

technical field [0001] The invention relates to a drying and energy-saving method for producing a polyaluminum chloride water purifying agent, and also relates to a device for realizing the drying and energy-saving method for producing a polyaluminum chloride water purifying agent. Background technique [0002] In the "Guidelines for Key Areas of High-tech Industrialization with Priority Development" jointly compiled by the National Development and Reform Commission and the Ministry of Science and Technology, it is clearly stated that water treatment chemicals should be identified as key products for national priority development. Polyaluminum chloride is the most widely used and used water purification chemical agent. At present, the total demand for water treatment chemicals for industrial water purification in cities in my country is about 1 million tons, but the annual output is only about 600,000 tons. The market gap is very large, and there is a huge potential market a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F1/52C01F7/58F26B21/14F26B23/02
CPCY02P20/10Y02P20/129
Inventor 晏永祥刘少峰
Owner 长沙天水环保科技有限公司
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