Method for processing industrial waste acid solution and preparing drying agent by using dolomite-containing attapulgite clay

A technology of attapulgite clay and industrial waste acid, applied in separation methods, chemical instruments and methods, adsorption water/sewage treatment, etc., can solve problems such as hindering production, production restrictions, etc., to improve product quality and desiccant quality. , the effect of reducing requirements

Inactive Publication Date: 2009-11-25
HEFEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In some industries, such as the production of activated clay, due to the serious discharge of acidic waste liquid, such enterprises are classified as seriously polluting enterprises, and their production is restricted, and they are excluded from settling in various places, which seriously hinders production

Method used

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  • Method for processing industrial waste acid solution and preparing drying agent by using dolomite-containing attapulgite clay

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Preparation of silica from attapulgite clay and collection of acidic waste liquid

[0021] The attapulgite clay layer is mined in layers, and high-quality ores with attapulgite content greater than 60% and quartz and feldspar content not higher than 5% are selected according to weight percentage. When the water content is too high, first carry out drying treatment. According to the specific production scale and climatic conditions, natural air drying or dryer drying can be considered for drying. It is generally required to make the water content less than 20%. The crushing operation is carried out under the premise that the water content meets the requirements, and the crushing particle size requires 100% to pass 100 mesh to obtain attapulgite clay powder.

[0022] Add 1 ton of dolomite attapulgite clay powder and 2.5 tons of hydrochloric acid solution with a concentration of 100g / L into a reaction kettle or a container, and continue stirring and reacting for 3 hours un...

Embodiment 2

[0029] Mix 70 L of hydrochloric acid acidic waste liquid with an acidity of 100 g / L and 70 kg of attapulgite clay powder containing 50% dolomite evenly. Under the normal temperature condition, the dolomite in the clay reacts with the waste acid solution. After the wet mixture is extruded and uniformly mixed, it is molded into particles with a particle diameter of 3mm, and calcined at 400°C for 1 hour. The solid product is cooled, and packaged under dry conditions to obtain the attapulgite clay composite desiccant product. The attapulgite clay composite desiccant adsorbent prepared according to the above steps is respectively placed in desiccators containing 58.2%, 47.8%, 38.4%, and 26.2% sulfuric acid solutions with a relative humidity of 20%, 40% %, 60% and 80%, the adsorption equilibrium was 48 hours. The water absorption test adopts the gravimetric method. The test results of equilibrium adsorption water under different relative humidity are shown in figure 1 . The des...

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Abstract

A method for treating industrial waste acid liquid containing dolomite attapulgite clay and preparing a desiccant, characterized in that the volume-to-mass ratio of waste acid liquid to dolomite attapulgite clay is 0.4 to 1 L / kg, adding Dolomite-containing attapulgite clay powder, the dolomite in the clay reacts with the waste acid solution, so that the pH of the mixture is greater than 3 after the reaction, and the water content of the mixture is controlled; the wet mixture containing water is formed and calcined to obtain attapulgite clay Composite desiccant; industrial waste acid liquid includes acid waste liquid produced from activated clay, acid waste liquid produced from attapulgite clay or bentonite and hydrochloric acid or sulfuric acid as raw materials to produce active silica, etc. The present invention not only treats and utilizes attapulgite clay or bentonite processing acid waste liquid, realizes zero discharge of waste water, but also saves raw materials such as calcium chloride and binder required for the preparation of common attapulgite clay desiccants, making the The production cost of the attapulgite clay composite desiccant is greatly reduced.

Description

technical field [0001] The invention relates to a method for treating industrial waste acid liquid with attapulgite clay containing dolomite and preparing a desiccant. Background technique [0002] Desiccant is an essential material for building insulating glass, food, medicine, textile and machinery industries to keep items dry and ensure product quality during product storage and transportation. It is also a material widely used in dehydration and drying of various industrial gases and liquids. At present, widely used desiccants include: compound desiccant such as anhydrous calcium chloride, lime desiccant, silica gel desiccant, clay desiccant (such as montmorillonite clay, attapulgite clay desiccant). Anhydrous calcium chloride desiccant will liquefy after absorbing water, and under certain circumstances, it will have a certain corrosive effect on the product. Silica gel and molecular sieve desiccants have good drying effects, but the cost is the highest among all kinds ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F1/66C02F1/28B01D53/28
Inventor 陈天虎黄晓鸣宋浩何宏平
Owner HEFEI UNIV OF TECH
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