CN1189461A

CN1189461A - Waste water treatment method in reduction method for prodn. of strontium carbonate

Info

Publication number: CN1189461A
Application number: CN97106830A
Authority: CN
Inventors: 毛令德; 孙长春
Original assignee: Individual
Current assignee: Individual
Priority date: 1997-01-28
Filing date: 1997-01-28
Publication date: 1998-08-05

Abstract

A non-pollution process for producing strontium carbonate features addition of iron sulfate to decompose ammonium hydrosulfide in waste water while to generate ferrous sulfide as by-rpdouct used as the raw material of sulfuric acid. Its advantages are simple process, less investment, and eliminating waste water generated during production of strontium carbonate by reduction method.

Description

Reduction method is produced method of wastewater treatment in the Strontium carbonate powder process

The invention belongs to alkaline-earth metal inorganic salt preparing technical field.Be specifically related to the water treatment method in a kind of strontium carbonate producing process.

The carbon reduction method of the most of employing of the method for domestic production Strontium carbonate powder at present.Main through steps such as calcining, leaching, removal of impurities, synthetic, filtration, oven dry, and unavoidable generation contains the waste water of sulphur hydrogenation ammonium in a large number in building-up process.One ton of Strontium carbonate powder of every production will give off the waste water of 25--15 ton, and the distinct disadvantage of reduction method production Strontium carbonate powder existence is seriously polluted like this.The someone adopts salt acid treatment leaching liquid now, makes sulphur hydrogenation strontium change into strontium chloride and hydrogen sulfide, and the hydrogen sulfide of generation absorbs the production Sodium sulfhydrate with 30% hydrochlorinate sodium.Though this method has solved pollution problem, consume a large amount of hydrochloric acid, cause the products production cost higher, productive profit does not almost have, and adding hydrogen sulfide absorption needs a large amount of storage cylinders, and investment is big, and sodium hydrosulfide is wanted concentrate drying, consumes lot of energy.The present invention adopts the method for adding ferrous sulfate, can the contaminated solution problem, can reclaim Iron sulfuret again, as the raw material of producing thiocarbamide.

The object of the present invention is to provide a kind of less investment, the method that the processing reduction method that cost is low is produced waste water in the Strontium carbonate powder process.

The method that the present invention takes is: producing in the process for producing strontium carbonate process to get green stone, when through calcining, leaching, removal of impurities, synthetic, the waste water that filters the sulfur-bearing hydrogenation ammonium of back generation, it or not direct discharging, but carry out decomposition reaction with the byproduct ferrous sulfate of producing the ammonium white powder, generate Iron sulfuret and ammonium sulfate, utilize Iron sulfuret precipitation, be convenient to isolating principle, reach emission standard after making the wastewater treatment of sulfur compound.

Describe in detail below in conjunction with accompanying drawing:

Accompanying drawing one is produced the process flow sheet of Strontium carbonate powder and wastewater treatment for reduction method.

The concrete technology method that the present invention takes follows these steps to carry out:

A. will synthesize the waste water that contains ammonium hydro sulfide 5～8 grams per liters of filtration squeezes into pump in advance Be placed with in the reaction tank of quantitative solid sulphuric acid ferrous iron, stirred 5～15 minutes, make it fully anti-Should, the ferrous sulfide that produces black precipitates.

B. after the check reaction was complete, the control pH value reacted in 8～8.5 range check methods Whether complete. As be lower than 8 and can regulate with ammoniacal liquor, adopt filtration under diminished pressure, adopt and take out 50 millis Rise reactant liquor, add the solid sulphuric acid ferrous iron of 0.05～0.2 gram in this reactant liquor, as do not have There is black precipitate to occur then being considered as reacting complete.

C. the filter cake that obtains after filtering is an Iron sulfuret.This filter cake is carried out drying, pulverizing, packing just as producing the thiocarbamide industrial raw material on 80～100 ℃ drying oven.

Through above-mentioned processing, its filtrate after testing sulfide content less than 1ppm, degree of conformity water emission standard, and the entire treatment technological operation is fairly simple, is suitable for suitability for industrialized production, and its purity of byproduct Iron sulfuret of generation is higher, reach the national product standard, can be used as the industrial raw material of producing thiocarbamide.

Embodiment 1

Get lazurite 200g and (contain S _rSO ₄80%) adds the 100g coke powder, mix to put into and put into beaker after assorted good fortune stove is warmed up to 1000～1100 ℃ of insulations taking-up cooling in 40～60 minutes, adding 2 liters of boiling water stirred 5 minutes, the sodium sulfate that adds the inclined to one side calculated amount of reason of ammonium amount while stirring, continue to boil, with hot water wash dry 4～5 times, bits discard, filtrate is put 1.1 times of bicarbonate of ammonia strontium saturated solutions that add the inclined to one side calculated amount of reason of strontium amount in airtight container of inspection and is produced a small amount of hydrogen sulfide with being absorbed by NaOH in the pipe derivation feeding 30%NaOH solution, after precipitin reaction finished, the filtration under diminished pressure precipitation produced solution for containing NH ₄HS waste water.Ferrous (the FeSO of solid sulphuric acid that in another beaker, adds metering ₄7H ₂O) 115 grams pour waste water and stirred 2～5 minutes, and whether take out 50 milliliters of this liquid checks still has unreacted NH ₄HS, filtering solution add 0.1g solid FeSO ₄For no black precipitate, react completely, measuring PH should be 8.5, and after testing, sulfide content is in the 0.8ppm allow compliance with emission standards.This handles waste water and finishes, and gets final product filtering emission, and filter is abandoned to Iron sulfuret and got final product 80～100 ℃ of oven dry.

Claims

1. a reduction method is produced the method for wastewater treatment of sulfur-bearing hydrogenation ammonium in the Strontium carbonate powder process, comprise steps such as calcining, leaching, removal of impurities, synthetic, wastewater treatment, it is characterized in that: wastewater treatment is adopted and is added the way that iron protocarbonate decomposes, and its main methods and technology are as follows:

A. will synthesize the waste water that contains hydrocarbonize ammonium 5～8 grams per liters after the filtration and adopt pump to squeeze in the prior quantitative solid sulphuric acid ferrous reaction tank, stir 5～15 minutes, it is fully reacted, the Iron sulfuret that produces black precipitates;

B. after check reacts completely, PH is in 8～8.5 scopes in control, as is lower than 8 and can regulates with ammoniacal liquor, and its filtrate can be discharged;

C. be Iron sulfuret after filtering, with this filter cake on 80～100 ℃ the drying oven after dry, through pulverizing, packing can be used as the industrial raw material of producing thiocarbamide.

2. method of wastewater treatment according to claim 1 is characterized in that: whether check reaction is complete, and adopting state to go into beaker, to take out the solid sulphuric acid of 50ml reaction 0.05～0.2 gram ferrous in reaction solution, as do not have black precipitate reaction to occur just being considered as to finish.