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Method for preparation of chemical raw materials by use of fly ash as raw material

A technology for chemical raw materials and fly ash, which is applied in chemical instruments and methods, inorganic chemistry, alkali metal compounds, etc. Consumption and other issues to achieve the effect of reducing emissions, improving utilization, and reducing production costs

Inactive Publication Date: 2015-06-24
QINGDAO XINGHUO CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, whether it is the acid leaching method or the alkali fusion method, the method of leaching aluminum from fly ash requires a roasting process, which greatly increases the energy consumption when leaching aluminum, and the acid leaching method is used to extract the powdered coal. When the aluminum element in the ash is used, the requirements for the material are extremely high, which increases the production cost. At the same time, the utilization rate of fly ash is not high, and the comprehensive utilization rate of its by-products is not high, which is easy to generate a large amount of waste water and liquid discharge , which further pollutes the environment

Method used

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  • Method for preparation of chemical raw materials by use of fly ash as raw material

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Experimental program
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Effect test

Embodiment 1

[0024] Take the fly ash and the hydrochloric acid with a mass percentage concentration of 4% and mix it according to the mass ratio of 1:6, put it in the reaction kettle, and carry out the reaction under constant stirring, the reaction temperature is 20 ° C, and a reflux device is set in the reaction kettle The volatile gas was recovered, and the volatile gas was condensed and returned to the reaction kettle to continue the reaction, and the reaction was terminated after 1.0 hours, and the solid-liquid separation was carried out to obtain the filtrate a and the filter cake a. Then, the filtrate a obtained after separation is slowly added with a calcium hydroxide emulsion with a mass percentage concentration of 20% under constant stirring, pH is adjusted to 7-9, and secondary pressure filtration separation is performed, and the filter cake b after the pressure filtration separation remains. For subsequent preparation of aluminum hydroxide, the filtrate b is dried to obtain calci...

Embodiment 2

[0026] Mix fly ash and hydrochloric acid with a mass percentage concentration of 20% according to a solid-liquid ratio of 1:0.5, place it in a reaction kettle, and carry out the reaction under constant stirring, the reaction temperature is 110 ° C, and a reflux is set in the reaction kettle The device recovers the volatile gas, and the volatile gas is condensed and refluxed into the reaction kettle to continue the reaction, and the reaction is terminated after 3.5 hours, and the solid-liquid separation is carried out to obtain the filtrate a and the filter cake a. Then, the filtrate a obtained after separation is slowly added with calcium hydroxide under constant stirring, and the amount of calcium hydroxide added accounts for 5% of the mass of the filtrate a. The pH is adjusted to 7-9, and the secondary pressure filtration separation is performed. The cake b is reserved for the subsequent preparation of aluminum hydroxide, and the filtrate b is dried to obtain calcium chloride...

Embodiment 3

[0028] Mix fly ash and hydrochloric acid with a concentration of 12% according to a solid-liquid ratio of 1:3, place it in a reaction kettle, and carry out the reaction under constant stirring. The reaction temperature is 40-90 ° C, and a reflux device is set in the reaction kettle The volatile gas is recovered, and the volatile gas is condensed and refluxed into the reaction kettle to continue the reaction, and the reaction is terminated after 3 hours, and the solid-liquid separation is carried out to obtain the filtrate a and the filter cake a. Then, the filtrate a obtained after separation was slowly added with 10% calcium hydroxide emulsion under constant stirring, adjusted to pH 7-9, and subjected to secondary pressure filtration separation, and the filter cake b after the separation by pressure filtration was reserved for subsequent preparation of hydroxide. Aluminum, the filtrate b is dried to obtain calcium chloride hexahydrate or dried to obtain calcium chloride dihydr...

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Abstract

The invention discloses a method for preparation of chemical raw materials by use of fly ash as a raw material, the fly ash is treated by a two step method, to be more specific, first the fly ash is treated by use of hydrochloric acid, and then is secondarily treated by use of fluosilicic acid or calcium fluoride solid to further enhance the formation rate of by-products in the fly ash, the by-products extracted from the fly ash are comprehensively utilized, the utilization rate of the fly ash is further improved to more than 99%; and by the two step method, disadvantages of high energy consumption, complex production process and high equipment material requirements of a conventional acid leaching method and an alkali melting method can be avoided. The production cost is reduced, the added values of products are improved, and by a backflow device and a return utilization method, the waste gas and waste water emissions are reduced and the environment pollution is reduced.

Description

technical field [0001] The invention relates to a technology for producing chemical raw materials, in particular to a method for preparing chemical raw materials by using fly ash as a raw material. Background technique [0002] Fly ash is a by-product of coal-fired thermal power plants. The discharge of a large amount of fly ash leads to environmental pollution. At the same time, the amount of fly ash is too large and occupies a large storage area, which in turn affects the use of agricultural land. Fly ash contains a large amount of useful substances, including 15% to 40% of aluminum, which is a relatively rich chemical raw material containing aluminum. According to statistics, the bauxite resources in my country are decreasing day by day, and a large amount of PAC flocculant is urgently needed for sewage treatment and drinking water purification. Aluminium is an inorganic polymer compound, which is a product between aluminium chloride and aluminium hydroxide. It has a stro...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01F11/24C01B33/32C01F7/02C01G49/02C01D5/00
Inventor 薛彦辉
Owner QINGDAO XINGHUO CHEM TECH