Comprehensive waste soda ash residue recycling method

A technology of waste slag and soda ash, 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, reduce production costs, and simplify the process flow

Active Publication Date: 2018-01-09
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

Method used

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  • Comprehensive waste soda ash residue recycling method

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Example Embodiment

[0034] Example 1

[0035] 1. Measure 1000ml of clean water and put it into the reaction mixing tank, weigh BaCO 3 84.2 g of barium carbonate with a content of 99% was added to the mixing barrel while stirring was started. Measure 446ml of hydrochloric acid solution with a HCl content of 37%, slowly add it into the mixing bucket, and after the barium carbonate is completely dissolved, weigh 500 g of the alkali residue from Guangdong Southern Soda Co., Ltd., slowly add it to the mixing bucket while stirring, and stir until sampling Stop stirring when the precipitate is detected to be free of calcium ions. Then use a centrifuge for solid-liquid separation, put the filtrate into a mixing tank, and wash the filter cake with clean water until the washing liquid has no Clˉ ions. And dried at 105 degrees Celsius 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 mix...

Example Embodiment

[0038] Example 2

[0039] 1. Measure 1000ml of clear water and put it into the reaction mixing tank, weigh 84.2g of barium carbonate powder, add it to the mixing tank while starting to stir, measure 446ml of 37% hydrochloric acid and slowly add it to the mixing tank, until the barium carbonate is completely dissolved Then weigh 500g of the alkali residue of Guangdong Southern Soda Co., Ltd., slowly add it to the mixing tank while stirring, and stop stirring until the precipitate does not contain calcium ions when sampling and testing, and then use a centrifuge for solid-liquid separation, and the filtrate is added and stirred. The filter cake was washed with clean water until the washing liquid did not contain Clˉ ions, then put it in an oven and dried to constant weight at a temperature of 105 degrees Celsius to obtain 98.5g of precipitated barium sulfate.

[0040] 2. Weigh 180g of ammonium bicarbonate powder, start the mixer and slowly add it to the mixing bucket while stirr...

Example Embodiment

[0042] Example 3

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

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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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IPC IPC(8): C01F11/46C01F11/18C01C1/16C05C3/00C01D3/04
Inventor 赵阳臣
Owner 赵阳臣
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