RU1821454C - Portland clinker raw mix - Google Patents

Abstract

The invention relates to the building materials industry, in particular, to the technology of cement production. In order to increase the sedimentation stability of the suspension and increase the mechanical strength of the granules, the raw material mixture, consisting of carbonate, clay and iron-containing components, additionally contains a spent drilling mud, including a stabilizing reagent suspension, in the following ratio, May. %: spent drilling clay mud 0.5 to 20.0; iron-containing component 1.0 to 5.0; carbonate component 75.0 -86.0; clay component rest. Spent drilling mud has the following grain composition, wt.%: Up to 0.4 microns 20 - 33; 0.4 - 0.8 μm 65 - 75; over 0.8 microns 25. 1 tab.

Description

The invention relates to the building materials industry, in particular to cement production technology.

. The purpose of the invention is to increase the sedimentation stability of the feed mixture and increase the mechanical strength of the granules.

This goal is achieved in that the feed mixture for the production of a cement clinker, including carbonaceous clay and iron components, additionally contains spent drilling mud, including a suspension stabilizing reagent, in the following ratio, wt.%:

Spent Drill

clay solution 0,, 0

Iron

component 1.0-5.0

Carbonate component 75.0 - 86.0

Spent burrva clay solution has the following grain composition, wt.%: Up to 0.4 microns -20-33; 0.4-0.8 microns - 65 -1 - 75, over 0.8 microns - 2-5.

The spent drilling mud is a homogeneous fine suspension of Jfe with a chemical composition, wt.%: SI02 20.0 -57.0, ABOz 11.0 - 25.4, Fe20z 2.0 - 5.5, CaO 2.0 - 3.0, MdO 1.5 - 2.5, 5Oz 0.05-2.8, Na20 0.1 - 1.5; K20 0.1 - 1.5, when calcining the dry component of the solution, the losses reach 8.0 - 16.5 wt.%.

The claimed technical solution differs from the prototype in that the clay component of the sludge requiring grinding and the addition of a diluent to increase humidity are replaced, in whole or in part, with a spent drilling mud having a fine structure and co hO

Ј

ate

holding reagents — a diluent and reagents — stabilizers, which leads to better homogenization of the feed mixture, the absence of coarse particles, the appearance of additional contact surfaces between the reacting components, while the feed suspension acquires qualitatively new properties.

An example embodiment of the invention.

The composition of the raw mixes was calculated using a saturation coefficient of 0.92 and an alumina module of 1.20.

Raw mixtures are prepared, each of which contains a certain percentage of the initial components (Table 1) chalk, brown and green clays of the Balakliya cement-slate plant, pyrite cinders, used drilling muds (shelebika, Kharkov region, containing nitroglycerin derivatives (igatane) in the amount of 0.2 wt.% as viscosity reducing reagent and 0.3 wt.% polyacrylonitrile as stabilizing reagent. Raw mixtures are prepared by dosing averaged samples of the starting components After y the average and Dosing of the raw material mixture is subjected to joint grinding by wet method to a residue on a sieve No. 0.08 6 - 8%, No. 02 0.3 to 0.6. Raw material mixture 8 is prepared according to the description according to A.S. sodium tripolyphosphate (0.1 wt.%) as a diluent, and tall oil (0.05 wt.%) as a dipergator;

Physico-mechanical properties of cement raw mixes and granules are presented in the table.

The presence of a slurry stabilizer reagent (in this case, polyacrylonitrile / igetane in drilling mud pax, reducing the moisture content of feed cuttings, increases the solids content in slurries, and, consequently, their sedimentation stability is increased. Replacing coarse cement sludge for finely dispersed, which constitutes the spent drilling mud, also significantly increases the sedimentation stability of the claimed sludge by 1.5 ... 3 times (table, 1) depending on the dosage waste drilling muds.

The presence of spent drilling mud in the cement feed mixture, which has a number of significant advantages over the traditional component of cement feed slurry, can increase the strength of granules by 1.5 .., 2.5 times (table), which indicates that the increase in the strength of granules is due to A number of factors:

reinforcing the granules with the molecules of the reagent - viscosity reducer (igetane) and the molecules of the reagent - stabilizer, the rapprochement of the particles that make up the granules due to a decrease in the water content in the initial suspension, the finely dispersed clay particles of the drilling fluid (up to 95 - 98% by weight of the particles are less than 0.8 μm), enveloping larger carbonate sludge particles, create additional contacts in the granule. The combined effect of these factors makes it possible to achieve qualitatively new technological properties of cement raw mixes containing spent drilling mud solutions.

The presence of highly dispersed clay particles in the sludge makes it possible to prepare more uniform cement raw slurries with additional contacts between reacting components, which leads to an increased reactivity of the raw mixes (table).

The introduction of the spent drilling mud below 0.5 wt.% (With a corresponding increase in the content of other components with respect to the dry component of the sludge does not ensure the sufficient presence of fine fractions and the stabilizing reagent in the feed slurry and does not allow to achieve the goal, the introduction of the spent drilling clay solution 8, the raw mix above 20.0 wt.%, does not allow to obtain a clinker of high quality (mixture No. 6) because it does not have unfavorable modules and the coefficients are saturated , Uptake of free calcium oxide and wherein the abnormal phenomenon occurs with E.....

The test results of the properties of the inventive cement raw material mixture show that the replacement (full or partial) of the clay component and additives with the treated drilling mud leads to such great changes in the physical and technological properties of these mixtures, which are expressed in increased sedimentation stability of the raw mixes in 1.5 ... 3 times, the strength of the granules in .1.5, .. 2.5 times, as well as in the reduction of humidity and the intensification of clinker formation, which confirms the receipt of raw mixes, significantly differing from those known in comparison with the prototype - the base object.

Analyzing the experimental data, it should be noted once again that the set of properties investigated in the claimed solution is inherent in the spent clay

drilling fluid and the calculation of its individual features from the considered combination does not lead to such a significant positive effect, due to the method of obtaining and using drilling mud.

The use of the proposed raw mix will reduce energy consumption in the preparation of cement raw mixes, reduce the dust content of the exhaust gases from the furnace units, save fuel on clinker roasting, and utilize spent drilling fluids. This will allow to obtain an economic effect of 23.81 kopecks / ton of clinker / calculation is applied / in comparison with the prototype - the base object.

The preparation of this mixture does not require the manufacture and installation of additional equipment.

Claims (1)

1. The raw material mixture for the preparation of Portland cement clinker, including carbonate, clay, iron-containing components, characterized in that, in order to increase the sedimentation stability of the raw material mixture and increase the mechanical strength of the granules, it additionally contains spent drilling mud, comprising a suspension stabilizing reagent in the following ratio of components, wt.%: clay component 0.5 - 9.0 iron-containing component 1.0 - 5.0 spent drilling mud 0.5 - 20.0 carbonate component 2, the Raw mix according to claim 1, characterized in that the spent drilling mud has the following grain composition, wt.%: up to 0.4 microns 20-30; 0.4 - 0.8 μm, 65 - 75; over 0.8 μm2-5.