SU958367A1 - Method for producing cement clinker - Google Patents

Description

(54) CnoSxDB RECEIVING A CEMENT CLINKER

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Isophilic production refers to the production of cement clinker and may find application in the building materials industry.

A known method for the production of cement clinker, which includes the grinding of components — carbon dioxide, clay, barite ore, mixing them, adjusting the silicate and alumina modules with 1-phase clay and pyrite cinder ti:

The closest technical solution to the present invention is a method for the production of cement clinker by grinding barium-containing sludge, carbonate and clay components, while preparing cement sludge and subsequent digging 12 d.

A disadvantage of the known methods is that the mixture obtained after mixing and adjusting the raw material with a moisture content of 39-40% has very low fluidity, as a result of which

cannot be transported by pipeline to the burning stage;

The main reason for the thickening of the raw material mixture is the increased content of hydraulically active substances - the chlorides of silk metals in the liquid part of barium-containing sludge.

The coagulating effect of chlorine ions is apparently related to the fact that in an aqueous medium they reduce the thickness of the hydrated shells around solid particles, thereby reducing the electrosurgical potential, which leads to an improvement in the conditions of attraction of the parts among themselves and as a result to their adhesion (coagutmcin), and

5 this leads to thickening of the raw mixture. To give the raw mixture its flowable properties, it is diluted with water to a yield strength of 55 mm, however, the strength of the mixture increases to 44%, which is

20 turn increases energy consumption at the stage.

The purpose of the invention is to prevent sludge thicken.

The goal is achieved in that according to the method of producing cement clinker by grinding barium-containing sludge, carbonate and clay components, making cement, sludge and subsequent calcining, before grinding, barium-containing sludge is dewatered to a moisture content of 8-18% and in the preparation of cement sludge, water containing chlorine if 0.15% .. It is advisable to conduct the dehydration of barium-containing sludge to a residual moisture content of 8-18%.

With partial dewatering of barium sludge, part of the chlorine ions is removed along with the solution. Removing a part of chlorine ions and replacing no more than 0.15% chlorine prevents the influence of the coagulum - thickening of the mixture and, therefore, allows to obtain a mixture with sufficient fluidity while reducing the moisture content of the mixture to 39-41%.

Reducing the moisture content of the mixture by 3-5% provides a significant reduction in energy consumption at the stage of firing the raw mix.

Dehydration of barium-containing sludge to a residual moisture content of more than 18% is impractical, since the quantities of chlorine ions remaining with the liquid in the sludge are sufficient for the mixture to start coagulating, i.e. thickening and sludge dewatering to a residual moisture less than 8% is also impractical for economic reasons.

The quality of water introduced into the mixture is, for example, wastewater previously purified from chlorine ions to a content of not more than 0.15% CE or process water. The use of water containing more than 0.15% CC is not a cel-% aznr, since the thickening of the raw mix significantly increases with the booster.

The method is carried out as follows.

Barium-containing sludge is dewatered in a drying apparatus or in natural conditions to a moisture content of 8–18%. Next, the bound sludge, carbonate and glitter components are crushed separately or combined and mixed. In case of incomparability, the raw material mixture is adjusted for the syrup and alumina module, and water containing less than 0.15% chlorine ion is added to the finish.

Mixture yield 55 mm. Next, the syfevut mixture is fed through a pipeline into a rotary kiln, where it is burned at 1450 ° C, and cement clinker is unloaded from the kiln.

Example1 (prototype). 78 kg of limestone, 17 kg of clay, 3 kg of pyrite orapKciB and 1O kg of barium-containing sludge, calculated on the dry matter, the humidity of which is equal. 8O%, is sent to a ball mill for grinding to a residue on sieve No. 008. The resulting syfie mixture does not have fluidity and, therefore, transportability. To obtain a raw material mixture capable of being transported through pipes, 72 kg of water is added to it until a mixture with a spreading capacity of 55 mm is formed, while the moisture content of the mixture is 44%. Next, the feed mixture is directed through a pipeline to a rotary kiln, where at 1450 ° C the mixture is mixed. In this way, 62.5 kg of cement clinker is formed.

Example 2. 10 kg of barium-containing sludge is fed to a drying apparatus, where 7.2 kg of water is removed. Dehydrated sludge with a moisture content of 8%, together with 78 kg of lime, 17 kg of clay, 3 kg of pyrite ogarkov and 67 kg of water containing 0.1% SC, are sent to a ball mill for grinding to a residue on sieve No. 008 8-1О % The flowability of the resulting raw material mixture is 55 mm, and the moisture content is 39%. The feed mixture is then directed through a pipeline to a rotary kiln, where it is calcined at 145 ° C. With this, 62.5 kg of cement clinker is formed.

Example 3: 10 kg of barium-containing sludge is fed to a drying apparatus, where 6.8 kg of water is removed. Dehydrated barium-containing sludge with a moisture content of 12%, together with 78 kg of limestone, 17 kg of clay, 3 kg of pyrite cinders and 55 kg of water containing O, 12% CC, are sent to a ball mill for grinding to a residue on a sieve of Ms OO8 8 -10%. The flowability of the resulting raw material mixture is 55 mm, and the moisture content is 4%. This mixture is then sent to a rotary kiln, where at 1450 ° C the mixture is roasted. In this way, 62.5 kg of cement clinker is formed.

Example 4 10 kg of barium-containing sludge is fed to a drying agent, where 6.2 kg of water is removed. Dehydrated barium-containing slots with a humidity of 18%, together with 78 kg of lime, 17 kg

Clays, 3 kg of pyrite cinders and 68.2 kg of water containing 0.15% CC are sent to a ball mill for grinding to a residue on sieve No. O08 8-10%. The flowability of the mixture obtained is 55 mm, and the moisture content is 41%. The mixture is then sent to a rotary kiln, where at. obgig happens. At the same time forms 62.5 kg of cement to the ganker.

Example 5: 25 kg of barium-containing sludge is dehydrated in natural conditions to a moisture content of 12%. This removes 17.0 kg of water. Dehydrated barium-containing sludge with a moisture content of 12%, together with 78 kg of limestone, 17 kg of clay and 59 kg of water containing O, 12% of CX, are sent to the ball mill for grinding to a residue, on a sieve no. OO8 8-1О%. The flowability of the mixture obtained is 55 mm, and the moisture content is 4%. The mixture is then sent to the oven (where the mixture is turned on). This produces 62.5 kg of cement clinker.

Comparative data of the proposed method and prototype are given in the table.

Claims (1)

Claim A method of producing cement clinker by grinding barium-containing sludge, carbonate and clay components, preparing cement sludge and subsequent firing, characterized in that, in order to prevent thickening of the sludge, barium-containing sludge is dehydrated to a moisture content of 8-18% before grinding, and in the preparation of cement sludge water with a chlorine content of 0.15%.