CN101354936B - Method for preparing additive for zinc oxide resistance slice - Google Patents

Abstract

The invention relates to the manufacturing field of a nonlinear resistor plate and in particular discloses a method for preparing an additive for a zinc oxide resistor plate; the additive comprises the following compositions: 12 to 16 mol percent of Bi2O3, 21 to 26 mol percent of Sb2O3, 10 to 13 mol percent of Mn2CO3, 10 to 13 mol percent of Cr2O3, 10 to 13 mol percent of Co2O3 and 23 to 32 mol percent of SiO2; firstly, according to the mixture ratio, the compositions are weighed and used as raw materials; water, the weight of which is 1 to 1.5 times that of the raw materials is added and subjected to primary ball milling; the average particle diameter of the particles of a sizing agent is controlled to be 1 micron; secondly, the particles are dried in a pressure-type spray drying tower; the spray pressure is between 1.3 and 1.5 megapascal; the temperature of an inlet is between 250 and 380 DEG C; the temperature of an outlet is between 100 and 130 DEG C; thirdly, the particles are put into a calcining furnace; the room temperature rises to 200 DEG C within one hour and risen to 800 DEG C in a mode of rising 100 DEG C per 0.5 hour and keeping the temperature for 0.5 hour; the temperature rises form 800 DEG C to 830 DEG C for 0.5 hour and is kept for 40 minutes; the particles are cooled in the furnace; and finally the particles are crushed, sieved and subjected to secondary ball milling.

Description

A kind of preparation method of additive for zinc oxide resistance slice

Technical field

The present invention relates to non-linear resistor and make the field, relate in particular to a kind of preparation method of additive for zinc oxide resistance slice.

Technical background

The popular always grog technology of the production of traditional zinc oxide resistance sheet, i.e. additive calcine technology.That is: prepare burden, ball milling, drying, the additive calcining is pulverized, the additive secondary ball milling, mixing granulation, moisture moulding, binder removal burns till, abrasive disc, heat treatment, jet electrode, japanning is solidified, and electrical measurement is checked.In traditional additive manufacture craft, its fabrication cycle is long, and device therefor is also many, so also there are many shortcomings in traditional handicraft:

Shortcoming one: device therefor is more, needs ball mill, filter press, baking oven, edge runner (or pulverizer), calciner etc., and the use of large number quipments has increased the probability that objectionable impurities is sneaked into;

Shortcoming two: labour intensity is big, and process cycle is long, the production cost height, and production efficiency is low.

Summary of the invention

The object of the present invention is to provide a kind of preparation method who uses the additive for zinc oxide resistance slice that equipment is few, labour intensity is low, process cycle is short, cost is low, efficient is high.

In order to achieve the above object, of the present inventionly be achieved by the following technical solutions: a kind of preparation method of additive for zinc oxide resistance slice, the component of described additive comprises the Bi of 12～16mol% ₂O ₃, 21～26mol% Sb ₂O ₃, 10～13mol% Mn ₂CO ₃, 10～13mol% Cr ₂O ₃, 10～13mol% Co ₂O ₃, 23～32mol% SiO ₂, it is characterized in that described preparation method may further comprise the steps:

At first,, add 1～1.5 times water of described raw material weight, carry out ball milling one time, and the average grain diameter of control slip particle is 1 micron as raw material according to each component of said ratio weighing; Secondly, dry in the press spray drying tower, its atomisation pressure is 1.3～1.5MPa, and inlet temperature is 250～380 ℃, and outlet temperature is 100～130 ℃; Once more, the calciner of packing into was warmed up to 200 ℃ from room temperature through 1 hour, was warmed up to 800 ℃ according to 100 ℃ of intensifications in per 0.5 hour, 0.5 hour mode of insulation again, from 800 ℃ of intensifications 0.5 hour to 830 ℃, was incubated 40 minutes, cooled off with stove then; At last, pass through fragmentation, sieve, secondary ball milling gets final product.

Additive for zinc oxide resistance slice of the present invention preparation is behind a ball milling, and slip is spray drying in the press spray drying tower, and arid cycle is short, the shortlyest can be 1 hour (for example the additive of 2 tons of zinc oxide use levels also can finish at 6 hours inner dryings); And traditional handicraft is behind a ball milling, and slip injects filter press earlier, changes mud cake over to baking oven after the press filtration, will expect the piece crushing screening after the drying, is generally arid cycle 2 days.Comparatively speaking, the present invention uses that equipment is few, labour intensity is low, process cycle is short, cost is low, efficient is high.

Description of drawings

Fig. 1 is a calcining curve chart of the present invention, and wherein ordinate is a calcining heat, and abscissa is the time.

Embodiment

Embodiment 1:

With Bi ₂O ₃, Sb ₂O ₃, Mn ₂CO ₃, Cr ₂O ₃, Co ₂O ₃, SiO ₂According to molar percentage be respectively: 15.2mol%, 21.7mol%, 10.9mol%, 10.9mol%, 10.9mol%, 30.4mol% prepare burden, as raw material, add 1.5 times water of described raw material weight, in agitated ball mill, carried out ball milling 90 minutes; In the press spray drying tower, the control atomisation pressure is 1.5MPa again, 380 ℃ of inlet temperatures, and outlet temperature is carried out drying for 130 ℃; Adorn the alms bowl calcining then, its calcining curve as shown in Figure 1; At last, cross 40 mesh sieves through broken back, secondary ball milling can additive for zinc oxide resistance slice of the present invention.

Comparative Examples 1:

With Bi ₂O ₃, Sb ₂O ₃, Mn ₂CO ₃, Cr ₂O ₃, Co ₂O ₃, SiO ₂Respectively according to mol ratio: 15.2mol%, 21.7mol%, 10.9mol%, 10.9mol%, 10.9mol%, 30.4mol% prepare burden, as raw material, traditionally, Jia Shui, a ball milling, slip is injected filter press earlier, change mud cake over to oven drying after the press filtration, dry back, pulverize, sieve, calcining, secondary ball milling, obtain conventional oxidation zinc resistor disc additive.

Comparing result 1:

With the additive for zinc oxide resistance slice of present embodiment and the conventional oxidation zinc resistor disc additive of Comparative Examples, make 10 resistor discs traditionally respectively, measuring resistance sheet parameter, performance comparison is as shown in table 1:

Table 1

In the table:

U _10kARefer to that resistor disc is applied to the residual voltage value at resistor disc two ends, the kV of unit under the 10kA lightning current impacts;

U _1mARefer to that resistor disc is flowing through the residual voltage value that is applied to the resistor disc two ends under the 1mA electric current, the kV of unit;

Residual voltage ratio=U _10kA/ U _1mAIts value can be represented the protective value of lightning arrester, is worth lowly more, and the protection level is good more;

Gradient is meant the U of resistor disc on unit thickness _1mAValue, the V/mm of unit be worth greatly more, and the used resistor disc of identical product is just few more.

From above data as can be seen, by patent of the present invention, the residual voltage ratio of resistor disc is lower by 0.04 than Comparative Examples, and gradient improves about 11%.

Embodiment 2:

With Bi ₂O ₃, Sb ₂O ₃, Mn ₂CO ₃, Cr ₂O ₃, Co ₂O ₃, SiO ₂Respectively according to molar percentage: 12.5mol%, 25mol%, 12.5mol%, 12.5mol%, 12.5mol%, 25mol% prepare burden, as raw material, add 1.1 times water of described raw material weight, in agitated ball mill, carried out ball milling 90 minutes; In the press spray drying tower, the control atomisation pressure is 1.3MPa again, 250 ℃ of inlet temperatures, and outlet temperature is carried out drying for 100 ℃; Adorn the alms bowl calcining then, its calcining curve as shown in Figure 1; At last, cross 40 mesh sieves through broken back, secondary ball milling gets final product.

Comparative Examples 2:

With Bi ₂O ₃, Sb ₂O ₃, Mn ₂CO ₃, Cr ₂O ₃, Co ₂O ₃, SiO ₂According to molar percentage be respectively: 12.5mol%, 25mol%, 12.5mol%, 12.5mol%, 12.5mol%, 25mol% prepare burden, as raw material, traditionally, Jia Shui, a ball milling, slip is injected filter press earlier, change mud cake over to oven drying after the press filtration, dry back, pulverize, sieve, calcining, secondary ball milling, obtain conventional oxidation zinc resistor disc additive.

Comparing result 2:

With present embodiment additive for zinc oxide resistance slice and Comparative Examples conventional oxidation zinc resistor disc additive, make 10 resistor discs traditionally respectively, measuring resistance sheet parameter, performance comparison sees Table 2:

Table 2

The data of table 2 show that though prescription changes, influential to the overall performance of resistor disc, every index of present embodiment is still suitable with Comparative Examples.

The data of associative list 1 and table 2 improve in various degree or quite under the situation, adopt the inventive method in performance as can be seen, have shortened the drying time of additive; In the actual production, the composition of additive is more even, and after the calcining, it is easier that the pulverizing of additive becomes.

Claims (1)

1. the preparation method of an additive for zinc oxide resistance slice, the component of described additive comprises the Bi of 12～16mol% ₂O ₃, 21～26mol% Sb ₂O ₃, 10～13mol% Mn ₂CO ₃, 10～13mol% Cr ₂O ₃, 10～13mol% Co ₂O ₃, 23～32mol% SiO ₂, it is characterized in that described preparation method may further comprise the steps:

At first,, add 1～1.5 times water of described raw material weight, carry out ball milling one time, and the average grain diameter of control slip particle is 1 micron as raw material according to each component of said ratio weighing; Secondly, dry in the press spray drying tower, its atomisation pressure is 1.3～1.5MPa, and inlet temperature is 250～380 ℃, and outlet temperature is 100～130 ℃; Once more, the calciner of packing into was warmed up to 200 ℃ from room temperature through 1 hour, was warmed up to 800 ℃ according to 100 ℃ of intensifications in per 0.5 hour, 0.5 hour mode of insulation again, from 800 ℃ of intensifications 0.5 hour to 830 ℃, was incubated 40 minutes, cooled off with stove then; At last, pass through fragmentation, sieve, secondary ball milling gets final product.