DE1596734C - Use of cement furnace electro filter dust in a batch for the production of glass - Google Patents

Description

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As set out in the main patent in detail, it is 1 to 4 percent by weight, based on the falls in the production of cement during the glass approach (without possibly added breakage cleaning the gases withdrawn from the kiln. Glass). For batches of 1500 to 2000 kg, like them and vapors are often melted by electrofiltration as undesirable, so the amount is and uncomfortable to handle waste product in 5 electrostatic precipitator dust 15 to 80 kg. Preferably the a considerable amount of electrostatic precipitator dust, the filter dust of which in an amount of 1.5 to 2.5 or 3% » required removal, for example through deposition based on the weight of the glass attachment, added, a waste dump and covering it with a layer for a batch of 2000 kg so 30 to 50 or from sand, earth or the like. Or binding the dust by 60 kg / batch. These relatively narrow limits Spraying or adding auxiliary materials - everything with io should be adhered to to ensure good results the aim of land damage or other detrimental effects, as it has been shown that with a significant impact the aggressive filter dust on the environment. value exceeding the quality of the glass decreases, environment to prevent - additional work steps Naturally, the composition of the and brings with it additional costs, which the filter dust depending on the cement production costs of the cement. "15 raw materials and other

According to the main patent, one use is applied operating conditions. The cheapest access

this cement kiln electrostatic precipitator dust to the partial amount of electrostatic precipitator dust is affected by this.

or complete replacement of soda in batches. The general rule is that within

Manufacture of glass provided. As a result of this, the specified limits of 1 to 4 percent by weight

Twice a double technical benefit is achieved, 20 with falling SO ₃ -content more dust and with steep-

by adding less dust to the _{SO 3} content that is destroyed as such

and on the other hand technical and economic should. The optimal amount for the individual case can

result in economic advantages in glass production. without any inventive effort through simple preliminary tests

The investigations that are determined for the main patent.

were based primarily on filter dust, ² 5 for the added electrostatic precipitator dust are in

As in the case of cement production in a shaft furnace, roughly equivalent amounts of Na ₂ O are added to the glass batch

falls! \ and CaO omitted. According to the main patent

For some time now, soda has been used as a substitute for cement production. This results in a replacement of the CaO contributing components of the Ge electrostatic precipitator dust, which is in its 3 ° amount by the filter dust. In general, the setting of the electrostatic precipitator dust from the shaft furnace can more _{or less differentiate filter dust with regard to the Na 2} O component of the glass. In particular, the amount of soda and, with regard to the CaO components, the content of SO _{3 is} usually higher. Replace plaster of paris or limestone, this being the case on a case-by-case basis

It has been shown that this filter dust from components omitted to rotate _{even after the SO 3 -Ge}

tube furnaces when used in glass production 35 hold the filter dust can be adjusted. A

is more difficult to process and the additive becomes the replacement of soda and gypsum with the filter dust

Glass flux mixture requires careful regulation. preferred. As a rule, 1 part of filter dust occurs

The invention relates to a special issue of 0.5 to 0.8 parts of soda and a CaO formation the use of electrostatic precipitator dust according to the content equivalent amount of gypsum, depending on the composition Main patent with the purpose of separating the filter dust from batches and filter dust. Also the baskets and the incorporation into the mixture for the generation of the sand, the clay content and the content of The production of glass in this way on this iron oxide filter dust can have a certain influence. The opti rotary kilns to agree that the main terms and conditions with regard to the patent achieved advantageous technical results components and their proportions can be obtained in the manufacture of the glass, and a 45 applies to the particular case at hand Saving of further raw materials is achieved. determine simple preliminary tests.

It has been found that with the addition of this filter- An example of a typical analysis of one of the-

dust from rotary kilns very specific narrow-type electrostatic precipitator dust from a rotary cement

Limited quantity ranges must be adhered to and an oven is listed below:

Balance in the Na ₂ O and CaO content of the glass batch 50. ,, «« - «,"., " _Λ " ι

is to be done! ■ Loss on ignition (at 1100 ⁰ C) 11.30%

According to the invention it is provided that insolubles 2.79%

Use of cement furnace electrostatic precipitator dust in a SiO _a 2.44%

Batch for the production of glass according to patent ^ q 1.47%

1285689 the mixture between 1 and 4 weight 55 ' _p * _Q ³ 093 ° /

percent of an electrostatic precipitator dust from the cement * ^s * '' °

production in the rotary kiln originates, add and ^ aO .- 16.81 / ₀

for this approximately equivalent proportions of Na ₁ O and CaO in MgO .0.51%

Form of soda and. Gypsum or limestone from the SO ₃ '. 28.34%

To leave out the mixture. ■ _ 6 ° sulfur (S) 0.45%

K ₁ O <32.96 ° /,

Complete elimination is achieved in this way

this filter dust with accompanying technical _, «i_ ji, _MOI

Advantages in the manufacture of glass under the same- sum of the remaining components ■ 2.00 / ₀

timely cost reduction of both cement and 100.00%
of glass production. ' ⁶ 5

As stated above, the amount of rotation is. From the above analysis it can be seen that

pipe cement furnace electrostatic precipitator dust that does not add any significant amounts of Na ₂ O,

Approach is admitted, bound to precise limits; but contained considerable amounts of K ₂ O. Through-

If an equivalent proportion of soda is omitted in the batch and replaced by the filter dust, the composition of the melt is _{shifted in the direction of a lower Na 2} O content and a higher K ₂ O content. .

The replacement of approximately equivalent proportions of Na ₂ O and CaO, especially in the form of soda and gypsum, by 1 to 4 percent by weight of the electrostatic precipitator dust from rotary cement kilns, accelerates the melting process. It is possible that this is not only due to the chemical composition of the filter dust, but that the granulation given below is also important. More details about this are not yet known.

The rotary cement kiln electrostatic precipitator dust can, in accordance with the information in the main patent, be added to the batch for the production of glass in the form of powder or granules. In Form of the powder resulting from the electrofiltration the dust is relatively difficult to handle and transport. However, in some cases direct use of the dust is possible. However, it is usually advantageous to remove the electrostatic precipitator dust granulate. Known methods can be used for this purpose.

* The filter dust can be easily removed in granulated form handle and transport. The use of granules is therefore preferred. When using granules this is expediently used with a grain size of about 2 to 4 mm. The granulation favors which achieved by adding the filter dust xum glass base Melting acceleration.

In some cases it has proven to be useful to add coke meal to the mixture for the glass flow with the electrostatic precipitator dust, e.g. B. Grudekoks, or sawdust add. If necessary - in a manner known per se - carbon can be used in another form, but the use of coke powder or sawdust is preferred. Whether and in what amount coke meal or sawdust is added in individual cases depends on the particular composition of the glass batch and filter dust present and can be determined by simple preliminary tests. The addition of coke or sawdust has been particularly beneficial in the case of filter dust with a high SO ₃ content.

When using electrostatic precipitator dust from rotary cement kilns according to the rules given here the advantages according to the main patent as well as additional technical advantages are included achieved in glass production. Once the aggressive filter dust is destroyed as such, regardless of glass production with regard to the known harmful effects of dust on the environment already represents a significant advance. In the case of glass production, the electrostatic precipitator dust at least replaces it part of the soda, which enables savings to be made on this relatively expensive raw material, and the same applies to the simultaneous partial replacement of gypsum and / or limestone. Through this the starting materials are cheaper.

'The electrostatic precipitator dust is primarily suitable for Use in green glass production.

Claims (5)

Patent claims: 1. Use of cement furnace EIektrofilterstaub in a mixture for the production of glass according to patent 1285 689, characterized in that between 1 and 4 percent by weight of an electrostatic precipitator dust originating from cement production in the rotary kiln is added to the mixture and thus approximately equivalent proportions of Na ₂ O and CaO in the form of soda and gypsum or limestone in the mixture replaced. 2. Use according to claim 1, characterized in that the mixture between 1.5 and 2.5 percent by weight of the electrostatic precipitator dust added. 3. Use according to claim 1 or 2, characterized in that 1 part of filter dust about 0.5 to 0.8 parts of soda and a proportion of gypsum equivalent to the CaO content in the mixture replaced. 4. Use according to one of claims 1 to 3, characterized in that the filter dust used in granulated form, in particular with a grain size of about 2 to 4 mm. 5. Use according to one of claims 1 to 4, characterized in that the mixture coke meal or sawdust is added with the electrostatic precipitator dust.