Geological cement for solidification of radioactive incineration ash and solidification method of radioactive incineration ash

Abstract

The invention provides geological cement for solidification of radioactive incineration ash and a solidification method of the radioactive incineration ash. According to the solidification method of the radioactive incineration ash, slag containing aluminum silicate and an adsorbent are evenly mixed to prepare an A material of the geological cement, a composite liquid exciting agent is used for preparing a B material of the geological cement, the A material of the geological cement, the B material of the geological cement and the radioactive incineration ash are stirred in an agitator kettle for five minutes after water is added to the A material of the geological cement, the B material of the geological cement and the radioactive incineration ash, and then the mixture is moved into a die, so that forming and maintaining are achieved. According to the solidification method of the radioactive incineration ash, the waste tolerance can be improved greatly, the fluidity of a solidified body ranges from 150 mm to 180 mm, the fluidity is high, adjustment is available, the final setting time is shorter than twelve hours, and proper initial setting time is guaranteed for solidification. After maintenance is conducted for 28 days, the compressive strength of the solidified body reaches over 20 Mpa, freezing and thawing cycle testing is conducted twenty times, the compressive strength loss of a sample is smaller than 10%, soaking testing is conducted for 90 days, no crack exists on the surface of the solidified body, the compressive strength is in the rising tendency, and the leaching rate of the <137> Cs element on the forty-second day is 4.4*10<-4> m / d.

Description

technical field [0001] The invention belongs to the technical field of radioactive incineration ash solidification, and in particular relates to a novel geological cement material for radioactive incineration ash solidification and a solidification method thereof. Background technique [0002] There are many types of combustible radioactive waste produced by reprocessing plants, and more than 40% of solid radioactive waste is combustible, including fibrous substances (such as paper, wood, cotton fabrics, etc.), plastics, rubber substances, etc.; 50% to 80% of nuclear power plants % of solid radioactive waste is combustible waste; for these combustible radioactive solid waste, the usual treatment method is incineration, and the final product is homogeneous ashes, which are solidified with cement, glass or other methods. Incineration is also an attractive process for treating liquid organic waste because it is easy to burn and can achieve high volume reduction factors. Theref...

AI Technical Summary

Problems solved by technology

At present, a lot of research has been done on the curing technology of cement-based materials at home and abroad. There are traditional Portland cement, aluminate cement and Portland cement-clay mineral composite system, but there are still the following shortcomings in curing incineration ash with cement as the curing substrate. : The cement solidified body has poor density, high leaching rate, insignificant capacity reduction effect, high disposal cost, and when the incineration ash is mixed with metals such as lead, zinc, tin, etc., the solidified body will generate hydrogen during the placement process, and This causes the rupture of the cured product, and even damages the packaging barrel