CN1318594A

CN1318594A - Direct lithopone producing process

Info

Publication number: CN1318594A
Application number: CN 00112861
Authority: CN
Inventors: 罗辉俊
Original assignee: Individual
Current assignee: Individual
Priority date: 2000-04-17
Filing date: 2000-04-17
Publication date: 2001-10-24

Abstract

Barium sulfate powder is first prepared through decomposition process including the steps of washing and crushing barite, compounding dilute acid solution with nitric acid, hydrofluoric acid and water, steam heating of the acid solution, adding barite powder while stirring for reaction, filtering, washing filter cake with deionized water, drying and crushing. Barium sulfate powder is then mixed directly wire zinc sulfide in certain proportion to produce lithopone. The process can produce lithopone in any zinc sulfide content, and has mineral resource utilizatino as high as over 95%.

Description

Direct method is produced the method for zinc sulfide white

The invention belongs to a kind of method of producing zinc sulfide white.

The method of present domestic generation zinc sulfide white mainly is to adopt the precipitator method, is about to zinc sulfate and barium sulfide solution coprecipitation and makes the mixture of zinc sulphide and barium sulfate.The shortcoming of this method is, fixed investment is big, and the production cost height pollutes environment, and products obtained therefrom zinc sulphide content is not high.The external method such as the U.S. that produces zinc sulfide white adopts hydrogen sulfide to contain the method for excess sulfuric acid zinc by zinc sulfide white suspension, make hydrogen sulfide and zinc sulfate reaction precipitation go out zinc sulphide and improve zinc sulphide content, make barium sulfate with barium sulphide, can be up to the zinc sulfide white of 75% zinc sulphide, but this complex process, and forming useless by product, environmental pollution is serious.And USSR (Union of Soviet Socialist Republics) is to be settled out zinc sulphide with hydrogen sulfide from solution of zinc sulfate in the patent of the zinc sulfide white of the preparation different content zinc sulphide of nineteen eighty-three announcement, and barium sulphide carried out carbonization, then with the barium carbonate that is generated vitriolization, form barium sulfate, will directly mix with barium sulfate in proportion after the zinc sulphide high-temperature roasting.It is very uneconomic that this method is converted to barium sulfate again with barium carbonate.

The objective of the invention is to, provide that a kind of investment is little, cost is low, to the free of contamination substantially zinc sulfide white production method of environment, to solve prior art problems.

The present invention is achieved in that it is that the barium sulfate of directly zinc sulphide and decomposition method being produced mixes by the required proportional arrangement of zinc sulfide white, the technology that decomposition method is produced barium sulfate is: barite is cleaned, be crushed to 325 orders, in reactor, be made into diluted acid with deionized water and nitric acid and hydrofluoric acid, with steam-heated cal(l)andria to 60～70 ℃, under agitation add ground barium sulfate, react 2 hours after-filtration, filter block washs to pH value to 6.5～7 with deionized water, again through 200 ℃ of dryings, promptly get the barium sulfate powder after the pulverizing, again with the mixed in proportion zinc sulfide white finished product that promptly gets of zinc sulphide.

Preparation 20% dilute sulphuric acid under agitation slowly adds reaction with crude zinc oxide materials in reactor, the solution pH value reaches reaction in 5.1～5.4 o'clock and finishes, impurities is with reacting generating salt in the raw material, the gained solution of zinc sulfate is removed impurity after filtration, filtrate is heated to 80 ℃ again, 2～3 times of zinc powders that add copper, cadmium, nickel, plumbous total impurities, make it precipitation, filter, reheat to 80 ℃ adds potassium permanganate, be heated to and boil, add zinc oxide again and transfer pH value to 5.1～5.4, reacted 2 hours, filter and promptly get the POV zinc solution; The POV zinc solution is diluted to 5B é in reactor, feeds hydrogen sulfide, generate the zinc sulphide white precipitate, after filtration, the converter of packing into after the drying, 700 ℃ of following roastings 1 hour, the hurried cooling of back water of coming out of the stove was crushed to 325 orders again, gets zinc sulfide powder.

The present invention compared with prior art, advantage such as it is simple to have technology, with short production cycle, and fixed investment is few, and is pollution-free.Compare with the factory of equal scale, investment reduces 50%, and production cost is low by 1/3rd, and the most outstanding is that the present invention does not have the poisonous barium sulfide waste residue of solubility, waste water, exhaust gas emission, and environment is not polluted; And can make the zinc sulfide white of any content zinc sulphide, can reach more than 95% the utilization of ore resources.

Embodiments of the invention: preparation 20% dilute sulphuric acid under agitation slowly adds reaction with crude zinc oxide materials in acid-resistant reactor, the solution pH value reaches at 5.1～5.4 o'clock and reacts finish (zinc oxide and vitriolic consumption are pressed chemical equation and calculated), impurities is with reacting generating salt in the raw material, the gained solution of zinc sulfate is because of containing organic impurity and undissolved solid matter, remove with whizzer filtration or clarifying naturally method, filtrate is heated to 80 ℃ again, add copper, cadmium, nickel, 2～3 times of zinc powders of plumbous total impurities, add while stirring and make it precipitation, left standstill 4 hours, and filtered, reheat to 80 ℃, add potassium permanganate, be heated to and boil, with iron, manganese and organic impurity oxidation add zinc oxide again and transfer pH value to 5.1～5.4, reacted 2 hours, and filtered and promptly get the POV zinc solution; The POV zinc solution is diluted to 5B é in reactor, feeds purified hydrogen sulfide, generate the zinc sulphide white precipitate, filter with whizzer, filter block with the deionized water washing till do not have a free acid; With the zinc sulphide converter of packing into after 150 ℃ of dryings, air-isolation was 700 ℃ of following roastings 1 hour, and the hurried cooling of back water of coming out of the stove is crushed to 325 orders again, zinc sulfide powder; The barium sulfate that makes by standard and decomposition method mixes again, promptly gets the zinc sulfide white finished product.

The technology that decomposition method is produced barium sulfate is: the barite of content more than 95% cleaned, be crushed to 325 orders, in airtight acid-resistant reactor, be made into diluted acid with deionized water and nitric acid and hydrofluoric acid, the consumption of nitric acid and hydrofluoric acid is pressed foreign matter content and is calculated (more slightly than theoretical consumption), the consumption of water is ground barium sulfate 300～400KG per ton, with steam-heated cal(l)andria to 60～70 ℃, under agitation add ground barium sulfate, the reaction of silicon-dioxide and hydrofluoric acid generates silicon tetrafluoride gas in reaction process, iron, aluminium, calcium impurities and nitric acid reaction generate corresponding nitrate, react and filter with whizzer after 2 hours, filter block washs to pH value to 6.5～7 with deionized water, through 200 ℃ of dryings, get product after the pulverizing again.

Claims

1, a kind of direct method is produced the method for zinc sulfide white, it is that the barium sulfate of directly zinc sulphide and decomposition method being produced mixes by the required proportional arrangement of zinc sulfide white, it is characterized in that: the technology that decomposition method is produced barium sulfate is: barite is cleaned, be crushed to 325 orders, in reactor, be made into diluted acid with deionized water and nitric acid and hydrofluoric acid, with steam-heated cal(l)andria to 60～70 ℃, under agitation add ground barium sulfate, react 2 hours after-filtration, filter block washs to pH value to 6.5～7 with deionized water, through 200 ℃ of dryings, promptly get the barium sulfate powder after the pulverizing again, again with the mixed in proportion zinc sulfide white finished product that promptly gets of zinc sulphide.

2, direct method according to claim 1 is produced the method for zinc sulfide white, it is characterized in that: preparation 20% dilute sulphuric acid under agitation slowly adds reaction with crude zinc oxide materials in reactor, the solution pH value reaches reaction in 5.1～5.4 o'clock and finishes, impurities is with reacting generating salt in the raw material, the gained solution of zinc sulfate is removed impurity after filtration, filtrate is heated to 80 ℃ again, add copper, cadmium, nickel, 2～3 times of zinc powders of plumbous total impurities make it precipitation, filter, reheat to 80 ℃, add potassium permanganate, be heated to and boil, add zinc oxide again and transfer pH value to 5.1～5.4, reacted 2 hours, and filtered and promptly get the POV zinc solution; The POV zinc solution is diluted to 5B é in reactor, feeds hydrogen sulfide, generate the zinc sulphide white precipitate, after filtration, the converter of packing into after the drying, 700 ℃ of following roastings 1 hour, the hurried cooling of back water of coming out of the stove was crushed to 325 orders, zinc sulfide powder again.