CN104624069B - A kind of continuous, the dissolved under pressure method of sodium silicate - Google Patents

A kind of continuous, the dissolved under pressure method of sodium silicate Download PDF

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Publication number
CN104624069B
CN104624069B CN201410843133.5A CN201410843133A CN104624069B CN 104624069 B CN104624069 B CN 104624069B CN 201410843133 A CN201410843133 A CN 201410843133A CN 104624069 B CN104624069 B CN 104624069B
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sodium silicate
still
dissolved
granule
water
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CN201410843133.5A
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CN104624069A (en
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单日新
范安林
杨树林
闫朋
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金能科技股份有限公司
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Abstract

The present invention relates to a kind of continuous, the dissolved under pressure method of sodium silicate, concretely comprise the following steps: the sodium silicate of molten state is met water in shrend feed bin and swashed and be broken into the granule less than 1.5cm by (1), is then continuously introduced in dissolution kettle by granule sodium silicate by star-like rotary valve;(2) being squeezed into continuously in dissolution kettle by pump by the water in shrend feed bin, be passed through steam by dissolution kettle steam pipe simultaneously, stir under stirring action in still in still, sodium silicate granule is fully contacted with hot water in still;(3) being delivered to re-dissolved still by Pulp pump after sodium silicate granule fully dissolves, in re-dissolved still, after sodium silicate granule rapid solution, extraction is to liquid sodium silicate storage tank.The present invention solves to waste present in existing sodium silicate dissolution process the problems such as the energy, intermittently operated, labor intensity is big and investment cost is high.

Description

A kind of continuous, the dissolved under pressure method of sodium silicate

Technical field

The present invention relates to the dissolving method of a kind of sodium silicate, be specifically related to continuous, the dissolved under pressure method of a kind of sodium silicate, Belong to compound dissolution field.

Background technology

In traditional sodium silicate dissolution process, molten sodium silicate dissolution mechanism Chang Weisan after kiln discharging opening flows out Kind, wherein batch dissolution has two kinds, a kind of carry out dry colling and obtains block sodium silicate and then weigh for flowing into chain panel moulding apparatus Feeding static pressure dissolution kettle is passed through steam and carries out batch (-type) dissolving.The second swashs broken, then by water for flowing into shrend chute chance cold water Filter off, obtain solid particle and then weigh feeding and dissolve cylinder and be passed through steam and carry out batch (-type) dissolving.Above two mode is for adding Pressure, the method for discontinuous dissolved solid sodium silicate.It addition, the third is, the sodium silicate of modulus relatively low (below 3.30 moduluses) can Carried out continuously by normal pressure cylinder, be not pressurized dissolved solid sodium silicate, produce liquid silicic acid sodium solution.

The first traditional static pressure kettle dissolution mechanism, is a kind of discontinuous, dissolved under pressure sodium silicate solid production liquid silicon The method of acid sodium, need to use resistant to elevated temperatures chain panel moulding apparatus to lower the temperature molten state high temperature sodium silicate and (be down to 300 by 1500 DEG C About DEG C) and molding, the heat of this process sodium silicate is all wasted in atmosphere, fails effectively to reclaim;Need to make simultaneously Lowering the temperature chain panel moulding apparatus with recirculated water, cooling procedure volatilization consumes substantial amounts of water;And due to chain mat machine longtime running in Under hot environment, generally no greater than 5 years service life just need to be replaced.After its molding, solid adds dissolution kettle simultaneously, adds water Being passed through steam to dissolve, operating process need to manually weigh, and labor intensity is relatively big, and cost is high, and produces dust, production scene Environment is the most severe.

Traditional the second shrend dissolution mechanism, is also a kind of discontinuous, dissolved under pressure sodium silicate solid production liquid silicon The method of acid sodium, shrend process wastes the heat entrained by the high temperature of molten sodium silicate equally, and still needs to during subsequent dissolution In cylinder, it is passed through steam, causes energy waste;Simultaneously because it is intermittent, interval weighs the process of addition cylinder and need to manually assist Helping, labor intensity is relatively big and production on-site environment is difficult to control to;Additionally dissolving cylinder is pressure rotary equipment, and its difficulty of processing is relatively Height, equipment investment expense is bigger.

The third dissolution process is normal pressure due to its pressure, cannot dissolve completely, very to the sodium silicate of modulus > 3.30 In conglomerate, application is very limited.

In sodium silicate solids course of dissolution, temperature, impurity, water consumption, the granularity etc. of solid particle all can affect silicic acid The dissolving of sodium.During industrial employing steam pressing technology dissolved solid sodium silicate, steam pressure is linear with temperature, silicic acid The dissolution velocity of sodium solid increases with the rising of pressure (i.e. solution temperature);The alkaline earth oxides such as CaO, MgO and Al2O3、 Fe2O3During Deng metal-oxide content in solids more than 5%, sodium silicate solids is the most insoluble in water, in commercial production just The content of this kind of impurity is controlled less than 1% in the case of Chang;Dissolve and preferably complete in higher concentrations, dissolve hourly water consumption Low, NaOH concentration is relatively big, on the one hand can suppress the generation of hydrolytic process, it is to avoid generate SiO2Precipitation, on the other hand makes to dissociate SiO2Peptization course easily carry out, in commercial production, material-water ratio is generally 1:1.3-2;Solid particle is the thinnest, and course of dissolution is more Easily carrying out, thin specific grain surface is long-pending big, and the effective area contacted with water increases, enhanced dissolution rate.But work as particle size reduction During to certain value, the amplitude that specific surface area increases substantially reduces, and meanwhile, reduces granularity and makes manufacturing procedure tend to complicated.

Summary of the invention

The present invention is to solve that to waste the energy, intermittently operated, labor intensity present in existing sodium silicate dissolution process big And the problem such as investment cost is high, it is provided that a kind of continuous, the dissolved under pressure method of sodium silicate.Technical scheme is as follows:

A kind of continuous, the dissolved under pressure method of sodium silicate: comprise the following steps:

(1) sodium silicate of molten state fills the shrend feed bin of water from the importing of sodium silicate kiln, and sodium silicate chance water is sharp to be broken into Less than the granule of 1.5cm, then by star-like rotary valve, granule sodium silicate is continuously introduced in dissolution kettle;

(2) after the water in shrend feed bin and sodium silicate heat exchange, temperature rises to 60-100 DEG C (because sodium silicate temperature is higher, with water The temperature making water after heat exchange rises to 60-100 DEG C), then by heat exchanger heat exchange, the water temperature in shrend feed bin is controlled 50-85 DEG C, the water in feed bin is squeezed in dissolution kettle continuously by pump, in still, is passed through steam by dissolution kettle steam pipe simultaneously, is passed through steaming The amount of vapour and the weight ratio of sodium silicate are 0.01-0.2:1 so that the intrinsic pressure power of dissolution kettle is maintained at 1-2bar (owing to sodium silicate is molten Solution preocess heat release, the most required quantity of steam added is the least), under the pressure effect of 1-2bar, sodium silicate granule is gradually Terminad direction is moved, and stirs in still simultaneously, and the rotating speed of agitator A is 50-130 rev/min, sodium silicate granule and still interior-heat Water is fully contacted, and gradually dissolves, and sodium silicate granule more than 1 hour, controls undissolved sodium silicate solid in the dissolution kettle time of staying Body granule is less than 0.5cm;

Preferably, after the water in shrend feed bin and sodium silicate heat exchange, temperature rises to 95 DEG C;Shrend storehouse temperature after heat exchanger heat exchange Degree is 65 DEG C, and the weight ratio of the amount and sodium silicate that are passed through steam is 0.1:1;In still, the rotating speed of agitator A is 80 revs/min; Sodium silicate granule is fully contacted with hot water in still, gradually dissolves, and material is 1-3 hour in the dissolution kettle time of staying, it is furthermore preferred that The time of staying is 2 hours;

(3) it is delivered to re-dissolved still by Pulp pump after sodium silicate granule fully dissolves, controls the pressure in re-dissolved still For 2-3bar, in re-dissolved still, the rotating speed of agitator B is 50-130 rev/min, when material stops in still under stirring Between be 1-3 hour so that sodium silicate granule is completely dissolved, and the sodium silicate solution after being completely dissolved is under pressure by re-dissolved The continuous extraction of still end is to liquid sodium silicate storage tank;

Preferably, the pressure in re-dissolved still is 3bar, and in re-dissolved still, the rotating speed of agitator B is 90 revs/min, is stirring Mix effect lower material time of staying in still be 2 hours.

The present invention is applicable to dissolve less than or equal to the sodium silicate solid of 3.7 moduluses produce sodium silicate solution;Preferably, this Bright dissolving method is applicable to the sodium silicate solid of 3.5 moduluses and dissolves production sodium silicate solution.

(6) the melted sodium silicate heat that the present invention (1) shrend feed bin reclaims can be by heat exchanger cooling shrend feed bin High-temperature-hot-water reclaims.

The present invention compared with prior art has the advantage that

1, this technique can dissolve the sodium silicate of more high mode compared with existing tradition sodium silicate continuous normal pressure dissolution process. Conventional atmospheric dissolution process can only meet the sodium silicate of modulus less than 3.3 and dissolve, the conventional atmospheric when sodium silicate modulus is more than 3.3 Dissolution process will be unable to realize;The present invention can meet the sodium silicate of modulus≤3.3 and dissolve, and can realize again modulus at 3.3-simultaneously Sodium silicate between 3.7 is dissolved, it is possible to meet existing Chemical Manufacture demand.

2, compared with dissolution process with pressure with existing interval, this technique has several advantages that

(1) production process of the present invention does not produce solid material, there is not having bad luck of solid material, both decreased dust dirty Dye, reduces again the labor intensity of workman, reduces labour cost;

(2), in course of dissolution of the present invention, need during driving to use primary steam, primary steam consumption in normal productive process Considerably less, average≤0.1T/T sodium silicate solid, and interval dissolution process primary steam consumption with pressure is about 0.3T/T solid silicon Acid sodium.The present invention also reclaims about the heat of the steam of 0.4MPa (conversion for) 0.2-0.3T/T sodium silicate solid and is used for heating simultaneously Hot water.

Accompanying drawing explanation

Fig. 1 is the continuous pressure dissolution process flow chart of sodium silicate of the present invention.

Symbol description:

1. shrend feed bin, the most star-like rotary valve, 3. dissolution kettle, 4 agitator A, 5. dissolution kettle feed pump, 6. water circulating pump, 7. heat exchanger, 8. Pulp pump, 9. re-dissolved still, 10. agitator B.

Detailed description of the invention

Below in conjunction with specific embodiment further describe the present invention, advantages of the present invention and feature will be with describe and Apparent.But embodiment is only exemplary, the scope of the present invention is not constituted any restriction.Those skilled in the art should It should be appreciated that, the details of technical solution of the present invention and form can be repaiied lower without departing from the spirit and scope of the present invention Change or replace, but these amendments and replacement each fall within protection scope of the present invention.

The continuous pressure dissolving method of 1 one kinds of sodium silicate of embodiment: comprise the following steps:

(1) sodium silicate of molten state fills the shrend feed bin 1 of water from the importing of sodium silicate kiln, and sodium silicate chance water is sharp to be broken into Less than the granule of 1.5cm, then by star-like rotary valve 2, granule sodium silicate is continuously introduced in dissolution kettle 3;

(2) after the water in shrend feed bin 1 and sodium silicate heat exchange, temperature rises to 95 DEG C, then by heat exchanger heat exchange by shrend Water temperature in feed bin controls 65 DEG C, is squeezed in dissolution kettle 3 by the water in feed bin continuously by pump, simultaneously by dissolution kettle 3 steam pipe Being passed through steam in still, the weight ratio of the amount and sodium silicate that are passed through steam is 0.2:1 so that the intrinsic pressure power of dissolution kettle 3 is maintained at 1- 2bar, under the pressure effect of 1-2bar, sodium silicate granule gradually moves in terminad direction, stirs, agitator A in still simultaneously The rotating speed of 4 is 80 revs/min, and sodium silicate granule is fully contacted with hot water in still, gradually dissolves, and sodium silicate granule is in dissolution kettle 3 2 hours time of staying, control undissolved sodium silicate solids granule less than 0.5cm;

(3) it is delivered to re-dissolved still 9 by Pulp pump 8 after sodium silicate granule fully dissolves, controls the pressure in re-dissolved still 9 Power is 3bar, and in re-dissolved still 9, the rotating speed of agitator B 10 is 90 revs/min, when material stops in still under stirring Between be 2 hours so that sodium silicate granule is completely dissolved, and the sodium silicate solution after being completely dissolved is under pressure by re-dissolved still The continuous extraction of end is to liquid sodium silicate storage tank.

The continuous pressure dissolving method of 2 one kinds of sodium silicate of embodiment: comprise the following steps:

(1) sodium silicate of molten state fills the shrend feed bin 1 of water from the importing of sodium silicate kiln, and sodium silicate chance water is sharp to be broken into Less than the granule of 1.5cm, then by star-like rotary valve 2, granule sodium silicate is continuously introduced in dissolution kettle 3;

(2) after the water in shrend feed bin 1 and sodium silicate heat exchange, temperature rises to 62 DEG C, then by heat exchanger heat exchange by shrend Water temperature in feed bin controls 53 DEG C, is squeezed in dissolution kettle 3 by the water in feed bin continuously by pump, simultaneously by dissolution kettle 3 steam pipe Being passed through steam in still, the weight ratio of the amount and sodium silicate that are passed through steam is 0.05:1 so that the intrinsic pressure power of dissolution kettle is maintained at 1- 2bar, under the pressure effect of 1-2bar, sodium silicate granule gradually moves in terminad direction, stirs, agitator A in still simultaneously The rotating speed of 4 is 55 revs/min, and sodium silicate granule is fully contacted with hot water in still, gradually dissolves, and sodium silicate granule is in dissolution kettle 3 1.5 hours time of staying, control undissolved sodium silicate solids granule less than 0.5cm;

(3) it is delivered to re-dissolved still 9 by Pulp pump 8 after sodium silicate granule fully dissolves, controls the pressure in re-dissolved still 9 Power is 2-2.5bar, and in re-dissolved still, the rotating speed of agitator B 10 is 55 revs/min, and material stops in still under stirring Time is 1.5 hours so that sodium silicate granule is completely dissolved, and the sodium silicate solution after being completely dissolved is under pressure by the most molten Solve the continuous extraction of still end to liquid sodium silicate storage tank.

The continuous pressure dissolving method of 3 one kinds of sodium silicate of embodiment: comprise the following steps:

(1) sodium silicate of molten state fills the shrend feed bin 1 of water from the importing of sodium silicate kiln, and sodium silicate chance water is sharp to be broken into Less than the granule of 1.5cm, then by star-like rotary valve 2, granule sodium silicate is continuously introduced in dissolution kettle 3;

(2) after the water in shrend feed bin 1 and sodium silicate heat exchange, temperature rises to 98 DEG C, then by heat exchanger heat exchange by shrend Water temperature in feed bin controls 82 DEG C, is squeezed in dissolution kettle 3 by the water in feed bin continuously by pump, simultaneously by dissolution kettle 3 steam pipe Being passed through steam in still, the weight ratio of the amount and sodium silicate that are passed through steam is 0.1:1 so that the intrinsic pressure power of dissolution kettle 3 is maintained at 1- 2bar, under the pressure effect of 1-2bar, sodium silicate granule gradually moves in terminad direction, stirs, agitator A in still simultaneously The rotating speed of 4 is 80 revs/min, and sodium silicate granule is fully contacted with hot water in still, gradually dissolves, and sodium silicate granule is in dissolution kettle 3 3 hours time of staying, control undissolved sodium silicate solids granule less than 0.5cm;

(3) it is delivered to re-dissolved still 9 by Pulp pump 8 after sodium silicate granule fully dissolves, controls the pressure in re-dissolved still 9 Power is 2bar, and in re-dissolved still 9, the rotating speed of agitator B 10 is 80 revs/min, when material stops in still under stirring Between be 3 hours so that sodium silicate granule is completely dissolved, and the sodium silicate solution after being completely dissolved is under pressure by re-dissolved still The continuous extraction of end is to liquid sodium silicate storage tank.

The concrete grammar that the continuous pressure of 4 one kinds of sodium silicate of embodiment dissolves

(1) start star-like rotary valve 2, shrend feed bin 1 adds water valve, by shrend feed bin to 18m3Dissolution kettle 3 adds water, 20-30% is reached to dissolution kettle liquid level.Opening dissolution kettle all agitators A 4 speed of agitator is 110 revs/min, opens dissolution kettle 3 Steam valve, rises to 0.1MPa by pressure in still, when liquid level occurs in shrend feed bin 1, slowly boosts.Open dissolution kettle feed pump 5, ON cycle water pump 6, regulating frequency makes water on recirculated water normal, by regulation heat exchanger 7, controls shrend feed bin 1 temperature and exists Less than 85 DEG C, open the stirring of shrend feed bin 1 motor, make shrend feed bin 1 level stability at more than 2000mm, and higher than dissolution kettle 3 More than 2000mm.

(2) as dissolution kettle 3 pressure >=0.15Mpa, shrend feed bin 1 temperature≤85 DEG C turn down dissolution kettle 3 steam valve, dimension Hold current pressure, temperature.The sodium silicate of 3.5 moduluses of molten state is imported according to the speed of 3.25t/h and fills shrend feed bin 1, In feed bin, water liquid level and temperature are controlled by step 1, and the sodium silicate chance water of molten state is sharp to be broken into less than 1.5cm granule, then uses Rotate airtight valve to be continuously introduced in dissolution kettle 3 by little granule sodium silicate.

(3) opening dissolution kettle feed pump 5, add water to dissolution kettle, the charging initial stage adds discharge and controls with ingredient proportion 1.5:1, after stablizing 2 hours, ratio of water to material controls at 2.0:1.

(4) when dissolution kettle 3 liquid level reaches 60%, Pulp pump 8 terminal valve is opened, after opening Pulp pump 8 and Pulp pump 8 Start valve, to 18m3Re-dissolved still 9 recovered water glass solution, dissolution kettle 3 Liquid level is at 30-60%.Adjust according to still liquid level Dnockout pump frequency, dnockout pump no longer stops after opening, can reduce dnockout pump frequency, when dissolution kettle 3 when liquid level is low in dissolution kettle 3 During interior liquid level height, dnockout pump frequency can be improved, the regulation of dissolution kettle 3 liquid level can be beaten to certainly when dissolution kettle 3 liquid level tends towards stability Dynamic.

(5), when re-dissolved still 9 liquid level rises to 35%, turning of re-dissolved still 9 all agitators B 10, agitator B 10 is opened Speed is 90 revs/min, opens re-dissolved still 9 steam valve, re-dissolved still 8 is boosted to 0.3Mpa, turns down steam valve, stable Re-dissolved still 9 pressure >=0.2Mpa.

(6), when re-dissolved still 9 liquid level rises to 50%, unlatching re-dissolved still 9 extraction valve, under 0.2MPa effect, starts to silicon Acid sodium solution storage tank adopts material;Re-dissolved still 9 liquid level is controlled at 40-by extraction valve opening (extraction valve is opened and do not turned off) 60%;The sodium silicate solution of extraction modulus after testing is 3.5, and density is 1300kg/m3

In the present invention, in production operation, steam heats up, boosting is only used for startup procedure and uses, and produces sodium silicate after stablizing molten Solve self-heat generation and can meet sodium silicate production needs completely, it is not necessary to carry out steam heating.Steam consumption≤0.1 ton/(ton Sodium silicate solid).Sodium silicate lava heat hot water is recycled by heat exchanger 7, for other workshop section's production hot water, The most recyclable heat being equivalent to 0.26 ton of low-pressure steam of lava per ton.

Test example 1 is for above-mentioned 5 × 104T/ sodium silicate production instance, the implementation result of the present invention dissolves work with tradition The comparison of skill, as shown in table 1:

Table 1

Claims (9)

1. continuous, the dissolved under pressure method of a sodium silicate, it is characterised in that said method comprising the steps of:
(1) sodium silicate of molten state fills the shrend feed bin of water from the importing of sodium silicate kiln, and sodium silicate is met sharp being broken into of water and is less than The granule of 1.5cm, is then continuously introduced into granule sodium silicate in dissolution kettle by star-like rotary valve;
(2) after the water in shrend feed bin and sodium silicate heat exchange, temperature rises to 60-100 DEG C, then reclaims heat by heat exchanger heat exchange Measure and the water temperature in shrend feed bin is controlled 50-85 DEG C, the water in feed bin is squeezed in dissolution kettle continuously by pump, simultaneously by dissolving Still steam pipe is passed through steam in still, and the weight ratio of the amount and sodium silicate that are passed through steam is 0.01-0.2:1 so that in dissolution kettle Pressure is maintained at 1-2bar, under the pressure effect of 1-2bar, opens the agitator A in dissolution kettle, and the rotating speed of agitator A is 50-130 rev/min, sodium silicate granule time of staying in dissolution kettle is more than 1 hour, and sodium silicate granule gradually dissolves, and controls not The sodium silicate solids granule dissolved is less than 0.5cm;
(3) being delivered to re-dissolved still by Pulp pump after sodium silicate granule fully dissolves, the pressure controlled in re-dissolved still is 2- 3bar, in re-dissolved still, the rotating speed of agitator B is 50-130 rev/min, and material time of staying in still is under stirring 1-3 hour so that sodium silicate granule is completely dissolved, the sodium silicate solution after being completely dissolved was under pressure by re-dissolved still end Hold continuous extraction to liquid sodium silicate storage tank.
2. according to the method shown in claim 1, it is characterised in that the water in shrend feed bin and sodium silicate in described step (2) After heat exchange, temperature rises to 95 DEG C.
3. according to the method shown in claim 1, it is characterised in that in described step (2), the water temperature in shrend feed bin is through heat exchange Temperature is controlled at 65 DEG C by device.
4. according to the method shown in claim 1, it is characterised in that described step (2) is passed through amount and the sodium silicate of steam Weight ratio is 0.1:1.
5. according to the method shown in claim 1, it is characterised in that in described step (2), in still, the rotating speed of agitator A is 80 Rev/min.
6. according to the method shown in claim 1, it is characterised in that in described step (2), sodium silicate granule fills with hot water in still Tap is touched, and material time of staying in dissolution kettle is 2 hours.
7. according to the method shown in claim 1, it is characterised in that in described step (3), the pressure in re-dissolved still is 3bar, In re-dissolved still, the rotating speed of agitator B is 90 revs/min, and material time of staying in still is 2 hours under stirring.
8. the method as described in any one of claim 1-7, it is characterised in that described method is applicable to less than or equal to 3.7 moduluses Sodium silicate solid continuously, dissolved under pressure produce sodium silicate solution.
Method the most according to claim 8, it is characterised in that described method is applicable to the solid silicic acid less than 3.7 moduluses Sodium is continuous, dissolved under pressure produces sodium silicate solution.
CN201410843133.5A 2014-12-30 2014-12-30 A kind of continuous, the dissolved under pressure method of sodium silicate CN104624069B (en)

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CN201288059Y (en) * 2008-10-17 2009-08-12 株洲兴隆化工实业有限公司 Direct dissolution apparatus for molten sodium silicate
CN101508441A (en) * 2008-10-17 2009-08-19 株洲兴隆化工实业有限公司 Direct dissolution process for molten sodium silicate
CN202105600U (en) * 2011-05-03 2012-01-11 福建省沙县金沙白炭黑制造有限公司 Waste heat recovery device for sodium silicate dissolving
CN102836651A (en) * 2012-09-07 2012-12-26 福建海能新材料有限公司 Method for cyclically utilizing dissolved steam of solid sodium silicate
CN203139920U (en) * 2013-03-18 2013-08-21 福建省顺昌县新和纳米硅业有限公司 Solid water glass stewing system

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Publication number Priority date Publication date Assignee Title
JP2004203732A (en) * 2002-12-10 2004-07-22 Toshio Shimoda Method for producing single crystal highly functional zeolite which is made mainly from sewerage sludge incineration ash, and device for producing it

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN201288059Y (en) * 2008-10-17 2009-08-12 株洲兴隆化工实业有限公司 Direct dissolution apparatus for molten sodium silicate
CN101508441A (en) * 2008-10-17 2009-08-19 株洲兴隆化工实业有限公司 Direct dissolution process for molten sodium silicate
CN202105600U (en) * 2011-05-03 2012-01-11 福建省沙县金沙白炭黑制造有限公司 Waste heat recovery device for sodium silicate dissolving
CN102836651A (en) * 2012-09-07 2012-12-26 福建海能新材料有限公司 Method for cyclically utilizing dissolved steam of solid sodium silicate
CN203139920U (en) * 2013-03-18 2013-08-21 福建省顺昌县新和纳米硅业有限公司 Solid water glass stewing system

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