CN1634672A

CN1634672A - Method for treating and utilizing dreg of chlorate production

Info

Publication number: CN1634672A
Application number: CN 200410097559
Authority: CN
Inventors: 胡科洋; 刘梅锡
Original assignee: Individual
Current assignee: Individual
Priority date: 2004-11-29
Filing date: 2004-11-29
Publication date: 2005-07-06

Abstract

This invention relates to a method to solve the pollution problem of waste residue when in chlorate production by electrolyte method, which is characterized by adopting three procedures of water washing, detoxifcation process and integral utility. It deduces the pollution of the waste residue and recycles the poisons to the production.

Description

The processing and utilizing method of the slag mud that oxymuriate is produced

When the present invention relates to electrolytic process production oxymuriate, the processing and utilizing of the waste dregs mud of discharging.

When electrolytic process production sodium chlorate and Potcrate, discharge a kind of waste residue.The content of 6-valence Cr ions height of this waste residue belongs to Hazardous wastes.For many years, many domestic oxymuriate producers have carried out the research of several different methods to the processing of this waste residue, but because of its saliferous, contain multiple compositions such as sexavalent chrome and chlorate anions, can't solve the Detoxication utilization problem of slag mud so far.This slag is stored up disposal in each chloric acid saltworks at present.The waste residue that part oxymuriate producer stores up has formed public hazards in the locality.Relevant report is many, and more typical example is seen the Fujian Potcrate factory pollution case of State Environmental Protection Administration's on August 13rd, 2003 in 2003 " national ten overall situation pollution cases " that medium are announced.At present, the pollution of this slag has become the production Root of Clark Clematis of part oxymuriate producer.For this reason, demand developing effective processing and utilizing method urgently.

The purpose of the inventive method is that the pollution problem that the solution electrolytic process is produced the slag mud of oxymuriate is developed a kind of method that can reclaim nuisance, detoxify and utilize at this waste residue.When the inventive method was handled slag mud, the saline solution of recovery was valuable raw material in producing oxymuriate production, for final safe handling utilizes slag mud, needed detoxifcation slag mud, fully utilized this slag again.

Description of the invention is as follows:

When electrolytic process was produced oxymuriate, a kind of waste dregs mud of discharging contained the saline solution of about 30%-60%, and sodium chloride content is higher in this saline solution, contains sodium dichromate 99 and chlorate anions in the slag in addition.Because chromic content is higher in the slag mud, this slag mud belongs to Hazardous wastes.Because this waste residue has the salt slurry characteristic of chlor-alkali industry, contains sexavalent chrome again, toxic is big, belongs to Hazardous wastes.Therefore, the processing to it is relatively more difficult.The research of each oxymuriate producer shows that under the toxicity prerequisite of the slag of will degrading, comprehensive utilization is made good use of this slag simultaneously, does not have good recipe so far.

The present invention passes through: three big process procedures such as "-comprehensive utilizations that washing is reclaimed--detoxifcation is handled--" solve the pollution and the digestibility and utilization problem of this slag.

Contain 50% the saline solution of having an appointment in the oxymuriate production discharging slag mud, residual saline solution makes slag mud become Hazardous wastes in the slag, and still, saline solution residual in the slag mud is again valuable raw materials for production to oxymuriate production.For this reason, the present invention's mode that will take to wash slag mud is carried out saline solution and is reclaimed.For reclaiming saline solution economically, when slag mud being washed recovery, repeatedly repeat to take: the technology of " slag mud adds water--making beating washing--, and-slag liquid separates (recovery saline solution) " is washed.

Reclaim the certain concentration of saline solution tool for making,, reduce the energy consumption of its moisture evaporation, can take the lower water lotion of back operation concentration and the technology that contains the higher reverse washing of slag of saline solution constituent concentration of preceding operation so that when returning oxymuriate production and utilizing again.

For making slag mud safe utilization, the sexavalent chrome nuisance in the slag need be controlled under the standard of national Hazardous wastes, and the present invention is to the processing of detoxifying of slag mud.The reduction and detoxication of slag mud can add ferrous sulfate by 1---20 times of ferrous reduction of hexavalent chromium chemical reaction amount, carries out wet method detoxifcation in stirrer or reactor.

Detoxifcation to slag mud also can be used the high temperature reduction and detoxication method, proportional quantity admixture according to the 10-50% of slag mud amount: coal or cinder or flue dust or bamboo waste log or peat or mud and slag mud are mixed together, process pyroreaction in industrial furnace, reduction and detoxication slag mud.

Digestibility and utilization slag mud is the important step of the good slag mud of final safe handling, slag mud of the present invention utilize approach as follows: (1) makes cement producting material usefulness, is mixed together with grog and gypsum, and ball milling becomes cement, (2) work is produced the raw material of brick and tile, make the brick and tile base with clay, interior fuel, reburn and make brick and tile, (3) make Additive with sand, building stones, add cement, in the lime, stir into concrete or mortar together, digestibility and utilization.

The slag dirt that the invention solves oxymuriate production is dyed problem, in the pollution of nuisance to environment, with its recovery, turns back in the oxymuriate Production Flow Chart in reducing slag mud, turns harm into good, and has created new value.The present invention through washing reclaim, detoxifcation is handled and the technology of final digestibility and utilization slag mud, reach to reclaim the purpose that resource, end cost, safety, reliable treatments are utilized Hazardous wastes.

Embodiment one:

Slag mud: 250 kilograms, wash water (or saline solution of back operation recovery): 250 kilograms, add simultaneously in the agitator, making beating was washed after 30 minutes, filter-press dehydration, the saline solution that obtains reclaims, and returns oxymuriate production workshop section and utilizes;

According to top program, secondary repetitive operation again: slag mud adds water again--making beating--, and-pulp water separates, and the saline solution of Separation and Recovery returns preceding operation, makes slag mud making beating wash water and uses;

8 kilograms in ferrous sulfate adds an amount of hot water, is dissolved into the aqueous solution, and the slag mud behind filter-press dehydration adds in the stirred reactor, stirs detoxifcation through 30 minutes and reacts, and gets detoxifcation back slag argillization and tests, and meets national standard, does not belong to Hazardous wastes;

Slag mud after the detoxifcation after artificial seasoning or seasoning, mixes clay with weight ratio 5% and makes green compact, becomes brick and tile through high-temperature firing;

Slag mud after the detoxifcation after artificial seasoning or seasoning, adds in the cement clinker with weight ratio 1%, goes into cement grinding mill, becomes cement through grinding.

Embodiment two:

Slag mud: 500 kilograms, (back operation reclaims) light saline solution: 400 kilograms, add simultaneously in the agitator, the making beating washing is after 30 minutes, and filter-press dehydration, the saline solution that obtains return oxymuriate production workshop section and utilize.

Slag mud after the dehydration adds 500 kilograms in water again, goes in the agitator, and making beating washing 20 minutes through the suction filtration dehydration, is isolated 400 kilograms saline solution again, and operation is made washing lotion (this operation can repeat 1-4 time) before returning.

Slag mud after washing, dehydration according to weight ratio, adds the flue dust of 15--50%, and mixing and stirring is gone into industrial furnace, through 1000 degree high temperature Celsius, reduction and detoxication.

Slag after the detoxifcation with weight ratio 10-30%, mixes clay and makes base, burns till brick and tile through high temperature.

Slag after the detoxifcation adds in cement and the lime and other raw materials of sandstone stir into concrete, mortar together with weight ratio 5--25%.

Claims

1, the processing and utilizing method of the slag mud of oxymuriate production is characterized in that adopting:--reduction and detoxication---comprehensive utilization, three processing steps, processing and utilizing slag mud are reclaimed in washing.

2, the method for claim 1, it is characterized in that slag mud is washed when reclaiming, repeatedly repeat to take: slag mud adds water--making beating washing--, and-slag liquid separates the technology of (liquids recovery) and washes, reclaim the certain concentration of liquid tool for making, when making it return oxymuriate production and utilize again, reduce the energy consumption of its moisture evaporation, pull an oar the technology of reverse washing in the dehydration slag of operation before the lower water lotion of operation concentration joins after can taking.

3, the method for claim 1 is characterized in that the reduction and detoxication of slag mud, can doubly measure the adding ferrous sulfate by the 1-20 of reduction of hexavalent chromium reacting weight, carries out wet method detoxifcation in stirrer or reactor.

4, the method for claim 1, it is characterized in that and to adopt: according to the 10-50% proportioning of slag mud amount, admixture: coal or cinder or flue dust or bamboo waste log or peat or mud and slag mud are mixed together, process pyroreaction in industrial furnace, reduction and detoxication.

5, the method for claim 1, the utilization of the slag mud after it is characterized in that detoxifying: (1) is made cement producting material and is used, be mixed together with grog, ball milling becomes cement, (2) work is produced the raw material of brick and tile, makes the brick and tile base with clay, interior fuel, burns till brick and tile (3) and makes additive with the sandstone material, add cement, lime adds water again, stirs into concrete or mortar.