CN102351217B - Method of removing lead in by-product sodium sulfate of recovery and processing of waste lead storage batteries - Google Patents

Abstract

Provided is a method of removing lead in the by-product sodium sulfate of recovery and processing of waste lead storage batteries. According to the invention, mother liquor for desulphurization by using crude lead mud and sodium carbonate are fully stirred, and a sodium hydroxide solution is added until the pH value of the mother liquor is 10; a sodium carbonate solution is added drop by drop under the condition of complete stirring until the pH value of the mother liquor is 10.5; lead sulfate is converted into basic lead carbonate which is precipitated; basic lead carbonate precipitate is removed by filtering and is recovered; obtained filtrate is condensed through distillation, and condensed filtrate is cooled to obtain crystals of sodium sulfate decahydrate, wherein, lead content in the crystals of sodium sulfate decahydrate meets quality requirements for industrial products of sodium sulfate. The method provided in the invention is simple and feasible.

Description

A kind of waste and old lead storage battery reclaims the method for removing lead of processing by-product sodium sulfate

Technical field

The present invention relates to waste and old lead storage battery and recycle, specifically, is that waste and old lead storage battery reclaims the method for taking off lead in the processing in the sodium sulfate byproduct.

Background technology

Along with the automotive industry great development, the recovery processing of waste and old lead storage battery is important all the more, the plumbous mud that obtains in the recovery processing of waste and old lead storage battery, adopt the pre-sulfur removal technology of yellow soda ash, the lead sulfate that is about in the plumbous mud transfers lead carbonate to, pre-desulfuration efficiency reaches more than 96%, greatly reduce the sulphur content in the raw materials for metallurgy, reduced the sulphur emissions amount in the flue gas in the fusion process, be converted into low-melting lead carbonate because of high-melting-point lead sulfate in the raw material simultaneously, reduce the smelting reducing temperature, reduced fuel consumption.Fig. 1 is seen in its technical process.

Mainly contain sodium sulfate, yellow soda ash in the pre-desulphurization mother solution, and unconverted lead sulfate (lead content about 0.2% in the sodium sulfate) etc., directly condensing crystal is inevitable leaded in the gained sodium sulfate.

Summary of the invention

The present invention adopts the chemical precipitation technology that pre-desulphurization mother solution is taken off plumbous the processing, and its technical scheme is as follows:

A kind of waste and old lead storage battery reclaims the method for removing lead of by-product sodium sulfate in the processing, and as shown in Figure 2, it comprises the steps:

Step 1. adds lead bullion mud mother liquor hydro-oxidation sodium solution under fully stirring of yellow soda ash desulfurization, to its pH value=10,

Step 2. drips sodium carbonate solution with step 1 gained solution under fully stirring, to its pH=10.5, make lead sulfate be converted into white lead carbonate (Pb ₂(OH) ₂CO ₃), precipitation,

Step 3. removes by filter step 2 gained precipitation white lead carbonate, reclaims,

Step 4. concentrates the filtrate distillation of step 3 gained, and cooling obtains the sal glauberi crystallization, and its lead tolerance reaches the industrial goods specification of quality of sodium sulfate.

Method simple possible of the present invention, the lead of the plumbiferous sodium sulfate mother liquor that waste and old lead storage battery is reclaimed produce in the plumbous sweetening process is produced white lead carbonate and is reclaimed, and the mother liquor behind the deleading concentrates the sal glauberi that obtains meeting sodium sulfate industrial goods specification of quality.

Description of drawings

Fig. 1 is waste and old lead storage battery roughing flow diagram;

Fig. 2 takes off splicer's process flow skeleton diagram for plumbous mud desulphurization mother solution of the present invention.

Embodiment

Embodiment

Get the pre-desulphurization mother solution of 100ml, its sodium sulphate content is 15.3%, and lead content is 500mg/L.Under agitation drip 15% sodium hydroxide solution to pH=10, change into and drip 15% sodium carbonate solution, to pH=10.5, continue to stir 20min, generate a large amount of white cotton-shaped white lead carbonate precipitations, filter, lead concentration is 0.4 mg/L in the filtrate.

Filtrate is concentrated into 50ml, and crystallisation by cooling is separated out colourless sal glauberi crystal 12.6g.Get the 5g sal glauberi and use water dissolution again, survey its lead content, obtaining the sal glauberi lead content is 0.022%, satisfies the specification of quality of industrial goods sodium sulfate.

Claims (1)

1. the method for removing lead of by-product sodium sulfate is characterized in that it comprises the steps: during a waste and old lead storage battery reclaimed and processes

Step 1. adds lead bullion mud mother liquor hydro-oxidation sodium solution under fully stirring of yellow soda ash desulfurization, to its pH value=10,

Step 2. at abundant agitation and dropping sodium carbonate solution, to its pH=10.5, makes lead sulfate be converted into white lead carbonate step 1 gained solution, precipitation,

Step 3. removes by filter step 2 gained precipitation white lead carbonate, reclaims,

Step 4. concentrates the filtrate distillation of step 3 gained, and cooling obtains the sal glauberi crystallization.

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