CN1058943C

CN1058943C - Technological process of calcium method producing bleaching powder extract

Info

Publication number: CN1058943C
Application number: CN97103582A
Authority: CN
Inventors: 王振文; 王凤歧; 张晓路
Original assignee: Individual
Current assignee: Individual
Priority date: 1997-05-04
Filing date: 1997-05-04
Publication date: 2000-11-29
Anticipated expiration: 2017-05-04
Also published as: CN1198403A

Abstract

The present invention relates to a technological method for producing bleaching powder concentrate by a calcium method. The technological method of the present invention has the technical processes that 1, chlorine is introduced in lime slurry until crystals with 25 to 35% of active chlorine are produced, and obtained materials are filtered to obtain wet cake and mother liquor A; 2, the wet cake and circulating mother liquor B are mixed for making slurry, the chlorine is introduced into the mixture until crystals with 45% to 55% of the active chlorine, obtained materials are filtered to obtain wet cake and mother liquor B, after the wet cake is dried, bleaching powder concentrate products with 60 to 65% of the active chlorine are obtained, and the mother liquor A and the mother liquor B are respectively in cyclic use. The method of the present invention has the advantages of simple technological condition, low production cost and no need of high-quality lime.

Description

A kind of method of calcium method producing bleaching powder extract

The present invention relates to a kind of processing method of calcium method producing bleaching powder extract

Bleaching powder extract generally is referred to as high test bleaching powder, is the hybrid junctions crystal of Losantin, calcium hydroxide and water, and its effective ingredient is a Losantin.The quality of high test bleaching powder is represented with available chlorine content.At present, the production technique of producing the bleaching powder extract of available chlorine content 60-65% mainly contains the calcium method, and promptly logical chlorine obtains product in lime white, and there is following shortcoming in this processing method: 1, the high-quality lime of needs; 2, a technology bar complexity, to logical amount of chlorine, logical chlorine speed, chlorine concentration gradient and the temperature of reaction aspects in retort all wanted strict control; 3, the chlorine consumption is big, the cost height.

The present invention is directed to the prior art above shortcomings, according to the required solution composition difference of bleaching powder extract that generates different available chlorine contents, and the production chlorine that bleaching powder extract consumed, the one, with generating the bleaching powder extract crystal, the 2nd, be used to generate the principle of required solution condition, a kind of processing method of calcium method producing bleaching powder extract is provided, utilize the inventive method to produce bleaching powder extract, not only greatly reduce the consumption of chlorine and lime, reduce production costs, and not needing high-quality lime, processing condition are simple.

The object of the present invention is achieved like this, a kind of processing method of calcium method producing bleaching powder extract, it is characterized in that this method is that to carry out leading to the chlorine reaction temperature first time be below 65 ℃ in concentration is the lime white of 25-35% (density be 115-125 gram/100 milliliters), when generating the xln of available chlorine content 25-40%, stop logical chlorine, filter the gained reaction solution, get wet cake and mother liquor 1;

After leaving standstill above-mentioned mother liquid obtained 1, get its supernatant liquid and in the technological process of for the first time logical chlorine, recycle; With above-mentioned gained wet cake and mother liquor 2 in 1: the ratio preparation pulping of 2-5, carry out the logical chlorinated with chlorine second time again, temperature of reaction is below 65 ℃, when generating the crystallization of available chlorine content 45-55%, stop logical chlorine,, get wet cake and mother liquor 2 reacting liquid filtering, filter cake get final product after drying the bleaching powder extract product of available chlorine content 60-65%, mother liquor 2 recycles in for the second time logical chlorine process.

The inventive method compared with prior art has the following advantages: 1, because the inventive method adopts the processing method of dividing one-step chlorination, recycling mother liquor, chlorine substantially no longer is consumed in produces on the required solution condition, therefore greatly reduce the consumption of chlorine and lime, experimental results show that the more present used processing method of the bleaching powder extract that adopts processing method of the present invention to produce one ton of available chlorine content 60-65% reduces about 0.7 ton of chlorine consumption, reduce lime consumption amount about 50%, greatly reduce production cost; 2, in the first step chlorination and filtration procedure of the inventive method, soluble impurity and insoluble impurities all can be removed, so do not need high-quality lime, the lime white that the powdery calcium hydroxide that uses common chemical industry lime to obtain through ashing, selection by winnowing is mixed with gets final product; 3, the inventive method processing condition are simple, and reaction end is clear and definite, are easy to control.

Below in conjunction with process flow sheet, the present invention is described in detail in detail with most preferred embodiment of the present invention.

Fig. 1 is a process flow sheet of the present invention.

As shown in Figure 1, getting 1200 gram density is/100 milliliters of 121 grams, by general chemical lime through ashing, the lime white that gained powdery calcium hydroxide is mixed with after the selection by winnowing places the reactor of belt stirrer, at for the first time logical chlorine below 65 ℃, when the available chlorine content of reaction gained xln reaches 27.5%, stop logical chlorine, this the reaction time is about 60 minutes, reaction solution weightening finish 165 grams, with the gained reacting liquid filtering, get wet cake 502 gram and mother liquors 1, the available chlorine content of mother liquor 1 reaches 4.25%, mother liquor 1 is left standstill, get its supernatant liquid and in for the first time logical chlorine process, recycle;

Get mother liquor 2 1000 grams, add above-mentioned gained wet cake 250 grams, stir pulping, at logical chlorine below 65 ℃, when the available chlorine content of reaction gained xln reaches 50.3%, stop logical chlorine, the logical chlorine time of this moment is about 50 minutes, reaction solution weightening finish 30 grams, and filtering and obtaining wet cake 164 grams and available chlorine content is 12.04% mother liquor 2, mother liquor 2 is recycling in the logical chlorine process for the second time, is 66.6% bleaching powder extract product with promptly getting available chlorine content after the gained wet cake drying.

Because mother liquor 2 is in recycling process, its contained reaction product can get more and more, and the concentration of mother liquor 2 is increased gradually, therefore, when recycling mother liquor 2, the dilution of the supernatant liquid of Ying Jiashui or mother liquor 1.

Be general data below according to two kinds of processing methodes of the bleaching powder extract of the same same quantity of lime white production of the use that drawn of experiment, identical available chlorine content:

Present used calcium method processing method of the present invention

Consumption amount of chlorine 305 grams 270 grams

Get the per 100 gram bleaching powder extracts consumption chlorine 166 of bleaching powder extract 183.6 grams 276.6 grams and restrain the per 100 gram bleaching powder extract cement comsumptions of 97.6 grams 203 grams 134.5 grams

Draw from above experimental data, adopt the inventive method to produce the bleaching powder extract of available chlorine content 60-65%, can reduce the consumption of chlorine and lime, production cost is descended greatly.

Claims

1, a kind of processing method of calcium method producing bleaching powder extract, it is characterized in that this processing method is is in/100 milliliters the lime white of 25-35%, density 115-125 gram in concentration, for the first time logical chlorine under temperature condition below 65 ℃, when generating available chlorine content and be the xln of 25-40%, stop logical chlorine, filter the gained reaction solution, get wet cake and mother liquor (1); After above-mentioned mother liquid obtained (1) left standstill, get its supernatant liquid and in for the first time logical chlorine process, recycle; Above-mentioned gained wet cake and mother liquor (2) are pressed 1: the proportional arrangement pulping of 2-5, carry out the logical chlorinated with chlorine second time again, temperature of reaction is below 65 ℃, when generating available chlorine content and be the crystallization of 45-55%, stop logical chlorine, with the gained reacting liquid filtering, the wet chlorine biscuit of wet cake and mother liquor (2) promptly get the bleaching powder extract product of available chlorine content 60-65% after dry, mother liquor (2) leads in the chlorine process for the second time and recycles.

2, a kind of processing method of calcium method producing bleaching powder extract according to claim 1 is characterized in that the used lime white of this processing method is a general chemical lime, and the configuration of gained powdery calcium hydroxide forms after ashing, selection by winnowing.

3, a kind of processing method of calcium method producing bleaching powder extract according to claim 1 should add the supernatant liquid dilution of water or mother liquor (1) when it is characterized in that recycling mother liquor (2) in this method.