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Method for producing calcium chloride and polyaluminum chloride by utilizing high-calcium fly ash

A technology of high-calcium fly ash and polyaluminum chloride, applied in the direction of aluminum chloride, calcium/strontium/barium chloride, aluminum halide, etc., can solve the problems of uneconomical aluminum and waste of valuable metals, and achieve comprehensive utilization The effect of high efficiency, shortened process, and improved economic efficiency

Inactive Publication Date: 2018-08-14
四川纳动科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Reports and patents on the extraction of valuable metals from high-calcium fly ash are rare. If aluminum is simply extracted, it is not only uneconomical, but also causes waste of other valuable metals

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Two 330MW units of a power plant in Inner Mongolia Autonomous Region produce about 1.92 million tons of high-calcium fly ash per year, and its composition is CaO-8.3%, Al 2 o 3 -44.43%, SiO 2 -31.37%, Fe 2 o 3 -1.95%, MgO-0.76%, Ignition loss -10.68%, all the fly ash is put into the ash yard without comprehensive utilization.

[0020] Using the method of the present invention, the above high-calcium fly ash and hydrochloric acid (solid-to-liquid mass ratio of 1:4) with a mass percentage concentration of 1% are mixed into a low-temperature stripping system, and the stripping temperature is controlled at 80° C., stripping time is 2 hours, and low-temperature stripping oxidation is carried out. The dissolution rate of calcium reaches 97.8%, and the dissolution rates of aluminum oxide and iron oxide are 1.7% and 2.3% respectively. After dissolution, the concentration of the calcium chloride solution reaches 14.2%, and the calcium chloride solution can be directly used a...

Embodiment 2

[0022] A large enterprise in Shandong Province produces about 3 million tons of high-calcium circulating fluidized bed fly ash every year, and its composition is CaO-18.07%, Al 2 o 3 -24.47%, SiO 2 -36.80%, Fe 2 o 3 -5.83%, MgO-3.27%, loss on ignition -11.56%.

[0023] Using the method of the present invention, the high-calcium fly ash of the above-mentioned components and hydrochloric acid (solid-to-liquid mass ratio 1:3) with a mass percentage concentration of 5% are mixed into a low-temperature stripping system, and the stripping temperature is controlled at 80° C., and the stripping time is 3 hours. The dissolution rate of calcium oxide reaches 98.2%, and the dissolution rates of aluminum oxide and iron oxide are 1.52% and 2.2%, respectively. After dissolution, the concentration of the calcium chloride solution reaches 18%, and the calcium chloride solution can be directly used as a product, or can be made into dihydrate calcium chloride or anhydrous calcium chloride p...

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PUM

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Abstract

The invention discloses a method for producing calcium chloride and polymeric aluminum chloride by utilizing high-calcium fly ash. The method takes the high-calcium fly ash and hydrochloric acid as raw materials, and calcium chloride and polymeric aluminum chloride products are produced through procedures of step-by-step temperature rising, section-by-section dissolution and the like. According to the method disclosed by the invention, the comprehensive utilization rate of valuable metal in the high-calcium fly ash is improved and environment pollution is reduced; and the method has the advantages of wide raw material source, short technological flow, less energy consumption and good economic benefits.

Description

technical field [0001] The invention relates to a method for producing calcium chloride and polyaluminum chloride by utilizing high-calcium fly ash, and belongs to the technical field of comprehensive utilization of fly ash. Background technique [0002] Fly ash is a waste discharged from coal-fired power plants, and it is also one of the largest industrial wastes in the world. Due to the continuous expansion of the number and scale of thermal power plants, the emission of fly ash has increased dramatically. In recent years, with the intensification of the contradiction between international energy supply and demand and the higher and higher requirements for environmental protection, fly ash, which has long been regarded as solid waste, has attracted the attention of countries all over the world, and extensive research has been carried out on it. Some progress has been made. [0003] High-calcium fly ash is a large category of fly ash, accounting for about 1 / 3 of the total...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01F11/24C01F7/56
CPCC01F7/56C01F11/24
Inventor 杨武刘希泉陈旭郑强章晓鹏陈伟
Owner 四川纳动科技有限公司