CN105645420A - Method for producing zero-water sodium metasilicate with sulfuric acid cinder - Google Patents
Method for producing zero-water sodium metasilicate with sulfuric acid cinder Download PDFInfo
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- CN105645420A CN105645420A CN201410613750.6A CN201410613750A CN105645420A CN 105645420 A CN105645420 A CN 105645420A CN 201410613750 A CN201410613750 A CN 201410613750A CN 105645420 A CN105645420 A CN 105645420A
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- sodium metasilicate
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- elemental sulfur
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Abstract
The invention relates to a method for producing zero-water sodium metasilicate with sulfuric acid cinder. The method comprises the following steps: (1) the sulfuric acid cinder is repeatedly washed with a hydrochloric acid solution; after filtering, a filter cake is washed three times with clear water, such that a pure filter cake is obtained; (2) the pure filter cake and liquid sodium hydroxide are mixed in a steam-heated reactor according to a pure mass ratio of 1:1.12-1.55, such that an alkaline sodium silicate solution modulus of 2.1-3.2 is produced; filtering is carried out, such that an elemental sulfur filter cake and a clarified filtrate are obtained; the filter cake is washed, dried and packaged, such that an elemental sulfur product is obtained; (3) the clarified filtrate is settled; obtained clear liquid is pumped into a modulus regulation tank; liquid caustic soda is added such that the modulus reaches 1:1; and evaporation concentration is carried out; (4) concentrate liquid is pumped into a mixer; a crystal seed is added, and stirring is carried out in the mixer; a product obtained by cooling crystallization is sieved and packaged, such that a zero-water sodium metasilicate crystal product is obtained. According to the invention, zero-water sodium metasilicate is prepared with sulfuric acid cinder as a raw material; and considerable economic benefit is created.
Description
Technical field
The present invention relates to the technical field of the comprehensive control of sulphuric acid inorganic industrial discharge and utilization, particularly relate to a kind of method utilizing pyrite cinder to produce zero water sodium metasilicate.
Background technology
Sulfuric acid industry is the sulphuric acid produced for contact raw method with troilite, is mainly made up of raw material, roasting, purification, conversion and five operations of absorption. To purify technological process in general custom, it is divided into the big class of dry and wet two through gas washing in SA production. Wet cleaning have again that pickling, hot concentrated acid wash and wash point. Current China pyrite-based sulfuric acid production, minority factory is pickling process, and majority is still washing process.
Troilite is mainly made up of sulfur and ferrum, with a small amount of non-ferrous metal and rare metal. Pyrite cinder is the residue discharged after pyrite burning extracts sulfur. In troilite except sulfur is utilized, ferrum and other elements remain in slag. Slag is used to ironmaking, extracts non-ferrous metal and manufacture the raw material of construction material.
The discharge capacity of unit sulfuric acid product is relevant with the grade of troilite and process conditions. Under identical process conditions, the more high then bed drain purge of the grade of troilite is more few, otherwise then high. When troilite sulfur content is 25��35%, general production sulphuric acid per ton about produces the clinker of 0.7��1 ton. The percentage composition of the various compositions of pyrite cinder being presented herein below: ferroso-ferric oxide content is 43.31%, aluminium sesquioxide content is 8.13%, and calcium oxide content is 1.63%, and content of magnesia is 0.46%, and silica content is 35.73%, and the content of sulfur is 0.16%.
In a series of inventions such as " prepare pyrite cinder are muriatic method with chemical method ", by being extracted ferroso-ferric oxide, aluminium sesquioxide, calcium oxide, magnesium oxide, silicon oxide, elemental sulfur element etc. after salt acid purification, acid non-soluble substance remaining after forming various slaine is silicon dioxide and elemental sulfur. The present invention is exactly the method utilizing the process waste residue of pyrite cinder to prepare the zero inclined silicon of water and elemental sulfur. The method is the patented invention that the typical disposal of three wastes is derivative, and its purpose seeks to the various materials inside the three wastes and element eats dry deep-frying only all of, in order to the secondary emission reducing the chemical industry three wastes of maximum possible. Therefore, a kind of highly desirable method utilizing pyrite cinder to produce zero water sodium metasilicate of people is come out.
Summary of the invention
The technical problem to be solved is, the improvement waste residue of pyrite cinder is processed, comprehensive utilization, prepare zero water sodium metasilicate and elemental sulfur, thering is provided a kind of method utilizing pyrite cinder to produce zero water sodium metasilicate, the method effectively avoids the secondary pollution of sulfuric acid industry, finds potentiality and eat that dry deep-frying is clean, turn waste into wealth in primary emission, eventually become valuable silicon series of products, create considerable economic benefit.
The technical solution adopted for the present invention to solve the technical problems is, a kind of method utilizing pyrite cinder to produce zero water sodium metasilicate, comprises the steps:
(1) the primary emission waste residue (being mainly the acid non-soluble substance such as silicon dioxide and elemental sulfur) that pyrite cinder is administered with 10��15% hydrochloric acid solution cyclic washing 21��33 minutes, filter cake after filtration clear water washs three times, make pH value reach 6��7 filter again stand-by, it is thus achieved that pure filter cake; Acid filtrate washing capable of circulation uses, to save cost and to prevent from polluting; Acid clear water washing liquid can blend hydrochloric acid cleaning mixture, and remainder is reasonably discharged by basic treatment;
(2) pure filter cake (in silicon dioxide) obtained above and liquid sodium hydroxide are mixed in steam-heated reactor with pure mass ratio 1: 1.12��1.55, start steam heating, making reaction generate modulus is the alkaline sodium silicate solution of 2.1��3.2, through filtering the filtrate obtaining elemental sulfur filter cake and clarification, filter cake is dried by washing, examines into packaging, obtains elemental sulfur product;
(3) by the filtrate of the clarification of above-mentioned acquisition through sedimentation, the clear liquid of acquisition pumping into modulus adjustment bucket, add liquid caustic soda and make modulus reach 1: 1, be evaporated concentration, it is thus achieved that concentrated solution, concentrated solution is sodium metasilicate;
(4) concentrated solution of above-mentioned acquisition is pumped into blender, it is simultaneously introduced crystal seed, this process continuously performs, can not be interrupted, constantly stirring in blender, the granule made constantly flows crystallisation by cooling in cooler, and the pelletized product after crystallisation by cooling is screened, packaging obtains zero water sodium metasilicate crystal product.
The main chemical reactions equation of the present invention is as follows:
SiO2+ 2NaOH=Na2SiO3+H2O
The invention has the beneficial effects as follows: 1, the invention provides a kind of method that process waste residue utilizing pyrite cinder prepares the zero inclined silicon of water and elemental sulfur, the method effectively make use of the material composition processing waste residue of pyrite cinder, the process waste residue of pyrite cinder is processed, comprehensive utilization, prepares the zero inclined silicon of water and elemental sulfur. 2, the zero inclined silicon of water and elemental sulfur are the products that economic worth is bigger, thus improve the economic benefit processing waste residue processing pyrite cinder, createing considerable economic benefit, being the model of chemical industry comprehensive control and utilization. 3, small investment, utilize the process waste residue of pyrite cinder to prepare zero water inclined silicon process and elemental sulfur is especially suitable, it may be said that open a Tiao Xin road. 4, the purity of preparation is high, and quality is guaranteed. 5, the method effectively avoids the secondary pollution of sulfuric acid industry, finds potentiality and eats that dry deep-frying is clean, turns waste into wealth, eventually become valuable silicon series of products, create considerable economic benefit in primary emission.
Detailed description of the invention
Embodiment one
A kind of method utilizing pyrite cinder to produce zero water sodium metasilicate described in the present embodiment, comprises the steps:
(1) take silica content be 35.73%, the pyrite cinder that content is 0.16% 500 kilograms of the sulfur preparation zero inclined silicon of water and elemental sulfur, the primary emission waste residue (being mainly the acid non-soluble substance such as silicon dioxide and elemental sulfur) that pyrite cinder is administered with 10��15% hydrochloric acid solution cyclic washing 21��33 minutes, filter cake after filtration clear water washs three times, make pH value reach 6��7 filter again stand-by, it is thus achieved that pure filter cake; Acid filtrate washing capable of circulation uses, to save cost and to prevent from polluting; Acid clear water washing liquid can blend hydrochloric acid cleaning mixture, and remainder is reasonably discharged by basic treatment;
(2) pure filter cake obtained above (silicon dioxide meter) and liquid sodium hydroxide are mixed in steam-heated reactor with pure mass ratio 1: 1.33, start steam heating, making reaction generate modulus is the alkaline sodium silicate solution of 2.1��3.2, through filtering the filtrate obtaining elemental sulfur filter cake and clarification, filter cake is dried by washing, examines into packaging, obtains 0.75 kilogram of elemental sulfur product;
(3) by the filtrate of the clarification of above-mentioned acquisition through sedimentation, the clear liquid of acquisition pumping into modulus adjustment bucket, add liquid caustic soda and make modulus reach 1: 1, be evaporated concentration, it is thus achieved that concentrated solution, concentrated solution is sodium metasilicate;
(4) concentrated solution of above-mentioned acquisition is pumped into blender, it is simultaneously introduced crystal seed, this process continuously performs, can not be interrupted, solution of sodium metasilicate through and crystal seed will add with certain speed, constantly stirring in blender, the granule made constantly flows crystallisation by cooling in cooler, and the pelletized product after crystallisation by cooling is screened, packaging obtains 362.3 kilograms of zero water sodium metasilicate crystal products.
Embodiment two
A kind of method utilizing pyrite cinder to produce zero water sodium metasilicate described in the present embodiment, comprises the steps:
(1) take silica content be 35.73%, the pyrite cinder that content is 0.16% 500 kilograms of the sulfur preparation zero inclined silicon of water and elemental sulfur, the primary emission waste residue (being mainly the acid non-soluble substance such as silicon dioxide and elemental sulfur) that pyrite cinder is administered with 10��15% hydrochloric acid solution cyclic washing 21��33 minutes, filter cake after filtration clear water washs three times, make pH value reach 6��7 filter again stand-by, it is thus achieved that pure filter cake; Acid filtrate washing capable of circulation uses, to save cost and to prevent from polluting; Acid clear water washing liquid can blend hydrochloric acid cleaning mixture, and remainder is reasonably discharged by basic treatment;
(2) pure filter cake obtained above (silicon dioxide meter) and liquid sodium hydroxide are mixed in steam-heated reactor with pure mass ratio 1: 1.53, start steam heating, making reaction generate modulus is the alkaline sodium silicate solution of 2.1��3.2, through filtering the filtrate obtaining elemental sulfur filter cake and clarification, filter cake is dried by washing, examines into packaging, obtains 0.8 kilogram of elemental sulfur product;
(3) by the filtrate of the clarification of above-mentioned acquisition through sedimentation, the clear liquid of acquisition pumping into modulus adjustment bucket, add liquid caustic soda and make modulus reach 1: 1, be evaporated concentration, it is thus achieved that concentrated solution, concentrated solution is sodium metasilicate;
(4) concentrated solution of above-mentioned acquisition is pumped into blender, it is simultaneously introduced crystal seed, this process continuously performs, can not be interrupted, solution of sodium metasilicate through and crystal seed will add with certain speed, constantly stirring in blender, the granule made constantly flows crystallisation by cooling in cooler, and the pelletized product after crystallisation by cooling is screened, packaging obtains 416.8 kilograms of zero water sodium metasilicate crystal products.
Embodiment three
A kind of method utilizing pyrite cinder to produce zero water sodium metasilicate described in the present embodiment, comprises the steps:
(1) take silica content be 35.73%, the pyrite cinder that content is 0.16% 500 kilograms of the sulfur preparation zero inclined silicon of water and elemental sulfur, the primary emission waste residue (being mainly the acid non-soluble substance such as silicon dioxide and elemental sulfur) that pyrite cinder is administered with 10��15% hydrochloric acid solution cyclic washing 21��33 minutes, filter cake after filtration clear water washs three times, make pH value reach 6��7 filter again stand-by, it is thus achieved that pure filter cake;Acid filtrate washing capable of circulation uses, to save cost and to prevent from polluting; Acid clear water washing liquid can blend hydrochloric acid cleaning mixture, and remainder is reasonably discharged by basic treatment;
(2) pure filter cake obtained above (silicon dioxide meter) and liquid sodium hydroxide are mixed in steam-heated reactor with pure mass ratio 1: 1.13, start steam heating, making reaction generate modulus is the alkaline sodium silicate solution of 2.1��3.2, through filtering the filtrate obtaining elemental sulfur filter cake and clarification, filter cake is dried by washing, examines into packaging, obtains 0.7 kilogram of elemental sulfur product;
(3) by the filtrate of the clarification of above-mentioned acquisition through sedimentation, the clear liquid of acquisition pumping into modulus adjustment bucket, add liquid caustic soda and make modulus reach 1: 1, be evaporated concentration, it is thus achieved that concentrated solution, concentrated solution is sodium metasilicate;
(4) concentrated solution of above-mentioned acquisition is pumped into blender, it is simultaneously introduced crystal seed, this process continuously performs, can not be interrupted, solution of sodium metasilicate through and crystal seed will add with certain speed, constantly stirring in blender, the granule made constantly flows crystallisation by cooling in cooler, and the pelletized product after crystallisation by cooling is screened, packaging obtains 307.9 kilograms of zero water sodium metasilicate crystal products.
The above is only three preferred embodiments of the present invention, is not used for limiting the present invention, its similar embodiments all, all should be covered by the protection domain of patent of the present invention.
Claims (1)
1. the method utilizing pyrite cinder to produce zero water sodium metasilicate, is characterized in that comprising the steps:
(1) the primary emission waste residue that pyrite cinder is administered with 10��15% hydrochloric acid solution cyclic washing 21��33 minutes, the clear water washing three times of the filter cake after filtration, make pH value reach 6��7 filter again stand-by, it is thus achieved that pure filter cake; Acid filtrate washing capable of circulation uses, to save cost and to prevent from polluting; Acid clear water washing liquid can blend hydrochloric acid cleaning mixture, and remainder is reasonably discharged by basic treatment;
(2) pure filter cake obtained above and liquid sodium hydroxide are mixed in steam-heated reactor with pure mass ratio 1: 1.12��1.55, start steam heating, making reaction generate modulus is the alkaline sodium silicate solution of 2.1��3.2, through filtering the filtrate obtaining elemental sulfur filter cake and clarification, filter cake is dried by washing, examines into packaging, obtains elemental sulfur product;
(3) by the filtrate of the clarification of above-mentioned acquisition through sedimentation, the clear liquid of acquisition pumping into modulus adjustment bucket, add liquid caustic soda and make modulus reach 1: 1, be evaporated concentration, it is thus achieved that concentrated solution, concentrated solution is sodium metasilicate;
(4) concentrated solution of above-mentioned acquisition is pumped into blender, it is simultaneously introduced crystal seed, this process continuously performs, can not be interrupted, constantly stirring in blender, the granule made constantly flows crystallisation by cooling in cooler, and the pelletized product after crystallisation by cooling is screened, packaging obtains zero water sodium metasilicate crystal product.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112429744A (en) * | 2020-11-02 | 2021-03-02 | 山东联科科技股份有限公司 | Production method of anhydrous sodium metasilicate |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112429744A (en) * | 2020-11-02 | 2021-03-02 | 山东联科科技股份有限公司 | Production method of anhydrous sodium metasilicate |
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