A method for comprehensive recovery and utilization of soda ash waste residue

A technology of waste slag and soda ash, which is applied in the fields of application, alkali metal chloride, nitrogen fertilizer, etc., can solve the problems of unsatisfactory recovery and treatment of alkali slag, achieve considerable benefits, less investment, and protect the environment

Active Publication Date: 2019-06-28
赵阳臣
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] The purpose of the present invention is to provide a method for efficient recycling of alkali slag, which can recycle precipitated barium sulfate, light calcium carbonate, agricultural grade ammonium chloride or industrial crude salt sodium chloride, and solve the unsatisfactory recycling of alkali slag at present The problem

Method used

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  • A method for comprehensive recovery and utilization of soda ash waste residue

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] 1. Measure 1000ml of water into the reaction mixing tank, weigh BaCO 3 84.2 g of barium carbonate with a content of 99% was added to the mixing tank while stirring. Measure 446ml of hydrochloric acid solution with an HCl content of 37%, and slowly add it into the mixing tank. After the barium carbonate is completely dissolved, weigh 500g of alkali residue from Guangdong Nanfang Soda Manufacturing Co., Ltd., and slowly add it into the mixing tank while stirring, and stir until the sample is collected. Stop stirring when it is detected that the precipitate does not contain calcium ions. Then use a centrifuge for solid-liquid separation, put the filtrate into a mixing tank, and wash the filter cake with water until the washing liquid has no Clˉions. And dried at 105 degrees centigrade to constant weight to obtain 98.5 g of precipitated barium sulfate powder.

[0036] 2. Weigh 240g of sodium carbonate powder, start the mixer and slowly add it into the mixing bucket while ...

Embodiment 2

[0039] 1. Measure 1000ml of clear water and put it into the reaction mixing bucket, weigh 84.2g of barium carbonate powder, add it into the mixing bucket while stirring, measure 446ml of 37% hydrochloric acid and slowly add it into the mixing bucket until the barium carbonate is completely dissolved Then weigh 500g of alkali slag from Guangdong Nanfang Soda Manufacturing Co., Ltd., slowly add it to the mixing tank while stirring, and stop stirring until the sediment is free of calcium ions after sampling. bucket, the filter cake is washed with clear water until the washing liquid does not contain Cl ˉ ions, put into an oven and dry at a temperature of 105 degrees Celsius to constant weight to obtain 98.5g of precipitated barium sulfate.

[0040] 2. Weigh 180g of ammonium bicarbonate powder, start the mixer and slowly add it into the mixing bucket while stirring, stop stirring until no bubbles are generated in the bucket, use a centrifuge for solid-liquid separation, add the fil...

Embodiment 3

[0043] With an annual output of 10,000 tons of soda ash waste residue, 1,970 tons of barium sulfate, 5,240 tons of light calcium carbonate, and 5,740 tons of ammonium chloride fertilizer can be recovered, saving 2,866 tons of raw materials for the country and reducing the amount of pollutant discharge. It avoids environmental pollution and protects the environment. It can also make multiple processes by itself, or cooperate with other companies to make full use of barium sulfate, light calcium carbonate, and ammonium chloride fertilizers recovered from soda ash waste residue.

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Abstract

The invention discloses a comprehensive waste soda ash residue recycling method. The comprehensive waste soda ash residue recycling method comprises the following steps: preparing a treatment solution; mixing a waste soda ash residue and the treatment solution for a stirring reaction; performing solid-liquid separation for recycling precipitated barium sulfate; recycling light calcium carbonate; recycling agricultural-grade ammonium chloride, industrial crude salt sodium chloride or potassium salt. By the comprehensive waste soda ash residue recycling method, the waste soda ash residue is comprehensively recycled, so that zero discharge of the waste residue and waste water during soda ash production is achieved; an alkali residue treatment technology is simple in flow path, low in investment, quick in effect, low in treatment cost and considerable in benefits.

Description

technical field [0001] The invention belongs to the comprehensive utilization technology of chemical waste residues, in particular to a method for recycling waste residues produced in the production process of soda ash to produce various chemical products. Background technique [0002] Alkali slag, commonly known as white mud, is the waste slag produced in the process of producing soda ash by the ammonia-alkali method in the soda ash plant. Generally, 0.3-0.4t of soda ash will be produced for every 1t of soda ash produced. The main components are: H 2 O (45.32%), CaCO 3 (28.16%), Clˉ (5.61%), CaO (1.42%), CaSO 4 (11.52%), Mg 2+ (1.42%), (Fe 2 o 3 +Al 2 o 3 +SiO2 2 ) is (2.26%). Moreover, the alkali slag has a high moisture content, is not easy to dehydrate, has a sticky texture, and has low added value for comprehensive utilization, and the treatment technology is immature, which can only treat the symptoms but not the root cause. Pollution and destruction of the s...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01F11/46C01F11/18C01C1/16C05C3/00C01D3/04
Inventor 赵阳臣
Owner 赵阳臣
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