Barium residue detoxifying method

A barium slag and raw material technology, which is applied in the field of solid waste disposal and cement materials, can solve the problems of high cost, failure to meet the requirements of detoxification, and difficulty in detoxification of barium slag, and achieves improved flexural strength and compressive strength, strong Absorption, pollution-resolving effect

Active Publication Date: 2015-04-08
陈世红
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  • Abstract
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Problems solved by technology

In fact, it is not easy to detoxify barium slag, because Ba 2+ Surrounded by other substances, it is very difficult to detoxify chromium slag [in the last two or three years, people have realized that Cr in chromium slag 6+ Because it is wrapped by other substances, in the various methods of detoxifying chromium slag, if the chromium slag

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  • Barium residue detoxifying method

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preparation example Construction

[0022] The method for preparing cement clinker adopted in the present invention is as follows: the above-mentioned raw materials are mixed in proportion through the batching system, and then dried and ground into a mill until the 45 micron sieve is less than 35%, or the 80 micron sieve is less than 20%, and the 200 micron sieve is less than 20%. Remainder is less than 2% to get raw meal powder (the sieve residue is mainly the crystalline SiO in the siliceous raw material 2 ); the raw meal powder enters the preheater and calciner for preheating and thermal decomposition reaction after being fully stirred evenly, and the apparent decomposition rate of the hot raw meal is controlled to be 90% to 95%, and then enters the cement kiln for calcination, and the calcination temperature is controlled At 1270°C-1370°C, the calcination time is 18-30 minutes, and the cement clinker can be obtained after cooling.

[0023] Further, the method for preparing Portland cement by using the above-...

Embodiment 1

[0024] Embodiment 1 (preparation of cement clinker):

[0025] Take 8 tons of limestone, 1.5 tons of clay, 0.45 tons of coal gangue, and 0.05 tons of barium slag, mix them evenly, dry them, grind them until the sieve of 45 microns is less than 35%, and obtain raw meal powder; Preheater (control preheater C1 temperature 310°C), calciner (control temperature 870°C) for preheating and thermal decomposition reaction, control the apparent decomposition rate of thermal raw material to 95%, and then enter the cement kiln for calcination, calcining The temperature is controlled at 1270°C, the calcining time is 30 minutes, and the cement clinker is obtained after cooling.

Embodiment 2

[0026] Embodiment 2 (preparation of cement clinker):

[0027] Take 4.5 tons of limestone, 4 tons of marl, 0.5 tons of loess, 0.5 tons of river mud, 0.3 tons of pyrite slag, and 0.2 tons of barium slag, mix them evenly, dry them, grind them to 80 microns and sieve them to less than 20% to get raw meal powder ; The raw meal powder enters the preheater (control the temperature of the preheater C1 at 300°C) and the decomposition furnace (control the temperature at 850°C) successively after being thoroughly stirred evenly, to carry out preheating and thermal decomposition reactions, and the apparent decomposition rate of the hot raw meal is controlled 93%, then enter the cement kiln for calcination, the calcination temperature is controlled at 1370°C, the calcination time is 18 minutes, and the cement clinker can be obtained after cooling.

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Abstract

The invention provides a barium residue detoxifying method which comprises the step of adding barium residue in the cement production process, wherein the barium residue is 0.2-0.8% of the cement raw material by mass percent. According to the barium residue detoxifying method provided by the invention, the aim of recycling the waste barium residues generated in the industrial production of barium salt is achieved; what is more, the barium residues are thoroughly detoxified to solve the pollution to the environment, particularly the pollution to the water quality; through the method, barium-containing cement is obtained; compared with the traditional Portland cement, due to the introduction of barium, the fracture resistance and the compressive strength of the cement are remarkably improved (both the early and later strengths of the calcium barium sulphoaluminate mineral are relatively high, and the Ba<2+> enters in the crystal lattice of C2S to enable the crystal to warp so as to improve the hydration activity of C2S), and strong absorption function is brought to the gamma-ray so as to bring a certain radiation protection performance.

Description

technical field [0001] The invention belongs to the technical field of solid waste disposal and cement materials, and relates to a barium slag disposal, in particular to a barium slag detoxification method for co-processing the barium slag in a cement kiln. Background technique [0002] Barium slag is the solid hazardous waste that produces in the barium salt industrial production, and the applicant investigates the barium slag in many places and finds that one is that the barium slag is piled up in the open air basically, and the other is that the content of soluble barium salt in the barium slag is high. 2 The total barium content is between 8% and 60%, while BaSO 4 The content is 0.00% to 1.8%. Soluble barium salt is a highly toxic chemical substance. According to relevant data, the lethal dose for humans is 0.8 grams (based on BaCl 2 Ingestion of 0.8 grams can lead to death due to cardiac rhythm disorder and respiratory paralysis; soluble barium salt entering the human...

Claims

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Application Information

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IPC IPC(8): C04B7/24
CPCY02P40/10
Inventor 陈世红
Owner 陈世红
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