A kind of method for preparing lead chromate from electroplating chromium slag

A technology of lead chromate and chromium electroplating, applied in the direction of chromate/dichromate, etc., which can solve the problems of high processing difficulty, large amount of chromium slag production, hazards, etc., and achieve simple process equipment, easy operation, and process flow short effect

Active Publication Date: 2017-12-22
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Chromium slag is produced in a large amount and is difficult to deal with. At present, hundreds of thousands of tons of chromium slag are produced in my country every year. Most chromium salt production and use enterprises adopt extensive open-air stacking methods, resulting in serious pollution of soluble chromium to soil, rivers and Groundwater, with great potential hazards

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] A, take by weighing 250 grams of chromium slag, 150 grams of sodium carbonate and 200 grams of sodium nitrate, mix the three materials evenly, fill them in a ceramic vessel and place them in a high-temperature furnace, calcinate for 2 hours at a temperature of 800 ° C, and then cool to room temperature and grind until the material passes through a 100-mesh sieve;

[0020] B. Add 1500 grams of water into the reactor and heat up to 70°C, then add the ground material obtained in step A under stirring conditions, leaching for 1 hour under stirring conditions of 400rpm, and obtain leachate and leach residue after separation;

[0021] C, the leaching liquid that step B separates obtains, add the nitric acid solution that mass concentration is 20% at room temperature, adjust the pH of leaching liquid to 7, then react at room temperature, 300rpm under stirring condition 0.5 hour, obtain purification filtrate and purification slag through separation ;

[0022] D, in the purifie...

Embodiment 2

[0027] A. Weigh 250 grams of chromium slag, 100 grams of sodium carbonate and 250 grams of sodium nitrate, mix the three materials evenly and place them in a ceramic vessel and place them in a high-temperature furnace, calcining at a temperature of 600°C for 3 hours, then cooling to room temperature and grind until the material passes through a 100-mesh sieve;

[0028] B. Add 1000 grams of water into the reactor and heat up to 90°C, then add the ground material obtained in step A under stirring conditions, leaching for 2 hours under stirring conditions of 450rpm, and obtain leachate and leach residue after separation;

[0029] C, the leaching liquid that step B separates obtains, add the nitric acid solution that mass concentration is 20% at room temperature, adjust the pH of leaching liquid to 8, react at room temperature, 0.5 hour under the stirring condition of 400rpm then, obtain purification filtrate and purification slag through separation ;

[0030] D. In the purified ...

Embodiment 3

[0035] A, take by weighing 250 grams of chromium slag, 200 grams of sodium carbonate, mix the sodium nitrate that embodiment 1 step E and embodiment 2 step E obtain and take by weighing 150 grams, three kinds of materials are filled in ceramic vessel after mixing homogeneously and Placed in a high temperature furnace, calcined at 700°C for 2.5 hours, then cooled to room temperature and ground until all materials passed through a 100-mesh sieve;

[0036] B. Mix the mixed solution obtained from Step F of Example 1 and Step F of Example 2 and add water to a liquid volume of 1250 grams, add it to the reactor and raise the temperature to 80°C, then add the mixture obtained in Step A under stirring The ground material is leached for 1.5 hours under the stirring condition of 500rpm, and the leachate and leach residue are obtained through separation;

[0037] C, step B separates the leachate obtained, add the nitric acid solution that mass concentration is 20% at room temperature, adj...

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PUM

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Abstract

The invention discloses a method for using electrochromism slag to produce plumbous chromate. The method adopts alkaline roasted chrome slag; the residue is separated through leaching, and PH of the leach liquor is adjusted using nitric acid solution to purify and separate impurities; lead in lead nitrate solution is precipitated and separated to get plumbous chromate precipitation, and finally plumbous chromate product can be obtained through separation, washing, and drying. The method has a short process flow, simple process equipment, and is easy and safe to operate; the method can use industrial wastes to produce high value-added chemical products to realize utilization of resources. The method can realize the secondary comprehensive utilization of resources, and fulfill the goal of circular economy, energy conservation and emission reduction.

Description

technical field [0001] The invention belongs to the field of utilization of solid waste in the chemical industry, and in particular relates to a utilization method of industrial waste slag generated in the production process of industrial electroplating. Background technique [0002] Chromium slag is mainly produced in the production process of metal chromium and chromium salts, and a large amount of chromium slag is also produced in industries such as tanning, electroplating, ceramics, and stainless steel smelting and processing. Chromium slag is a very dangerous national waste. Because it contains toxic chromium compounds such as water-soluble sodium chromate and acid-soluble calcium chromate, it will cause huge pollution to the ecological environment. The compound containing hexavalent chromium in chromium slag has a strong oxidizing property. After contact with the human body, it will strongly irritate the human skin and digestive tract, cause dermatitis and other diseas...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01G37/14
CPCC01G37/14
Inventor 苏毅孙成易德华李国斌罗康碧李沪萍
Owner KUNMING UNIV OF SCI & TECH
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